Hello, welcome to visit the official website of Zhejiang Zhongyi Gas Technology Co., Ltd.!

News Center

Check category

Application of air separation unit in iron and steel industry (conventional blast furnace smelting and melting reduction process and calculation with oxygen)

  • Categories:News
  • Author:
  • Origin:
  • Time of issue:2019-06-14 13:25
  • Views:

(Summary description)A large number of industrial gases such as oxygen, nitrogen and argon are used in the smelting process of iron and steel enterprises. Oxygen is mainly used in blast furnace, melting reduction smelting furnace, converter, electric furnace smelting; Nitrogen is mainly used for furnace sealing, protective gas, steelmaking and refining, slag splashing in converter to protect furnace, security gas, heat transfer medium and system purging, etc. Argon gas is mainly used in steelmaking and refining. In order to meet the production requirements and ensure the safe and stable operation of production, large steel mills are equipped with special oxygen station and oxygen, nitrogen and argon power pipe network system. Large-scale full-process steel enterprises are currently equipped with conventional processes: coke oven, sintering, blast furnace steelmaking, converter electric furnace steelmaking, rolling process, etc. Due to the emphasis on environmental protection and simplification of process flow, the international iron and steel industry has developed a short process process before iron in modern times - melting reduction iron making, which directly reduces iron ore raw materials into molten iron in a smelting furnace. There is a big difference in the industrial gas required by the two different smelting processes. The oxygen required by conventional smelting blast furnace accounts for 28% of the total oxygen demand of the steel plant, and the oxygen required by steelmaking accounts for 40% of the total oxygen demand of the steel plant. However, the smelt-reduction (COREX) process requires 78% of the total amount of oxygen needed for iron production and 13% of the total amount of oxygen needed for steel making. The above two processes, especially the melting reduction iron making process, have been popularized in China. Steel mill gas requirements: The main role of oxygen supply in blast furnace smelting is to ensure a certain high temperature in the furnace, rather than directly participate in the smelting reaction. Oxygen is mixed into blast furnace and mixed as oxygen-rich air into blast furnace. The oxygen enrichment efficiency of the blast air proposed in the previous process is generally below 3%. With the improvement of the blast furnace process, in order to save coke, after the use of large coal injection process, and to meet the requirements of the blast furnace production to promote output, the oxygen enrichment rate of the blast air is increased to 5∽6%, and the single consumption of oxygen is up to 60Nm3/T iron. Because the oxygen mixture of blast furnace is oxygen-rich air, the purity of oxygen can be low. The oxygen in the melting reduction steelmaking process needs to be involved in the smelting reaction, and the oxygen consumption is directly proportional to the steel production. The oxygen consumption in the melting reduction furnace is 528Nm3/t iron, which is 10 times of the oxygen consumption in the blast furnace process. The minimum oxygen supply required to maintain production in the melting reduction furnace is 42% of the normal production amount. The oxygen purity required by the melting reduction furnace is greater than 95%, the oxygen pressure is 0.8∽ 1.0MPa, the pressure fluctuation range is controlled at 0.8MPa±5%, and the oxygen must be ensured to have a certain amount of continuous supply for a certain time. For example, for the Corex-3000 furnace, it is necessary to consider the liquid oxygen storage of 550T. Steelmaking process is different from blast furnace and melting reduction furnace smelting method. Oxygen used in converter steelmaking is intermittent, and oxygen is loaded when blowing oxygen, and oxygen is involved in smelting reaction. There is a direct proportional relationship between the amount of oxygen needed and steelmaking output. In order to improve the service life of the converter, nitrogen slag splashing technology is generally adopted in steel mills at present. Nitrogen is in intermittent use, and the load is large during use, and the required nitrogen pressure is greater than 1.4MPa. Argon is needed for steelmaking and refining. With the improvement of steel varieties, the requirements for refining are higher, and the amount of argon used is gradually increasing. The nitrogen consumption of the cold rolling mill is required to reach 50∽67Nm3/t per unit. With the addition of the cold rolling mill in the steel rolling area, the nitrogen consumption of the steel mill increases rapidly. Electric furnace steel-making mainly uses arc heat, and the temperature in the arc action zone is as high as 4000℃. Smelting process is generally divided into melting period, oxidation period and reduction period, in the furnace can not only cause oxidation atmosphere, but also can cause reducing atmosphere, so the efficiency of dephosphorization, desulfurization is very high. Intermediate frequency electric furnace is a kind of will power freque

Application of air separation unit in iron and steel industry (conventional blast furnace smelting and melting reduction process and calculation with oxygen)

(Summary description)A large number of industrial gases such as oxygen, nitrogen and argon are used in the smelting process of iron and steel enterprises. Oxygen is mainly used in blast furnace, melting reduction smelting furnace, converter, electric furnace smelting; Nitrogen is mainly used for furnace sealing, protective gas, steelmaking and refining, slag splashing in converter to protect furnace, security gas, heat transfer medium and system purging, etc. Argon gas is mainly used in steelmaking and refining. In order to meet the production requirements and ensure the safe and stable operation of production, large steel mills are equipped with special oxygen station and oxygen, nitrogen and argon power pipe network system.



Large-scale full-process steel enterprises are currently equipped with conventional processes: coke oven, sintering, blast furnace steelmaking, converter electric furnace steelmaking, rolling process, etc. Due to the emphasis on environmental protection and simplification of process flow, the international iron and steel industry has developed a short process process before iron in modern times - melting reduction iron making, which directly reduces iron ore raw materials into molten iron in a smelting furnace.



There is a big difference in the industrial gas required by the two different smelting processes. The oxygen required by conventional smelting blast furnace accounts for 28% of the total oxygen demand of the steel plant, and the oxygen required by steelmaking accounts for 40% of the total oxygen demand of the steel plant. However, the smelt-reduction (COREX) process requires 78% of the total amount of oxygen needed for iron production and 13% of the total amount of oxygen needed for steel making.



The above two processes, especially the melting reduction iron making process, have been popularized in China.



Steel mill gas requirements:



The main role of oxygen supply in blast furnace smelting is to ensure a certain high temperature in the furnace, rather than directly participate in the smelting reaction. Oxygen is mixed into blast furnace and mixed as oxygen-rich air into blast furnace. The oxygen enrichment efficiency of the blast air proposed in the previous process is generally below 3%. With the improvement of the blast furnace process, in order to save coke, after the use of large coal injection process, and to meet the requirements of the blast furnace production to promote output, the oxygen enrichment rate of the blast air is increased to 5∽6%, and the single consumption of oxygen is up to 60Nm3/T iron.



Because the oxygen mixture of blast furnace is oxygen-rich air, the purity of oxygen can be low.



The oxygen in the melting reduction steelmaking process needs to be involved in the smelting reaction, and the oxygen consumption is directly proportional to the steel production. The oxygen consumption in the melting reduction furnace is 528Nm3/t iron, which is 10 times of the oxygen consumption in the blast furnace process. The minimum oxygen supply required to maintain production in the melting reduction furnace is 42% of the normal production amount.



The oxygen purity required by the melting reduction furnace is greater than 95%, the oxygen pressure is 0.8∽ 1.0MPa, the pressure fluctuation range is controlled at 0.8MPa±5%, and the oxygen must be ensured to have a certain amount of continuous supply for a certain time. For example, for the Corex-3000 furnace, it is necessary to consider the liquid oxygen storage of 550T.



Steelmaking process is different from blast furnace and melting reduction furnace smelting method. Oxygen used in converter steelmaking is intermittent, and oxygen is loaded when blowing oxygen, and oxygen is involved in smelting reaction. There is a direct proportional relationship between the amount of oxygen needed and steelmaking output.



In order to improve the service life of the converter, nitrogen slag splashing technology is generally adopted in steel mills at present. Nitrogen is in intermittent use, and the load is large during use, and the required nitrogen pressure is greater than 1.4MPa.



Argon is needed for steelmaking and refining. With the improvement of steel varieties, the requirements for refining are higher, and the amount of argon used is gradually increasing.



The nitrogen consumption of the cold rolling mill is required to reach 50∽67Nm3/t per unit. With the addition of the cold rolling mill in the steel rolling area, the nitrogen consumption of the steel mill increases rapidly.



Electric furnace steel-making mainly uses arc heat, and the temperature in the arc action zone is as high as 4000℃. Smelting process is generally divided into melting period, oxidation period and reduction period, in the furnace can not only cause oxidation atmosphere, but also can cause reducing atmosphere, so the efficiency of dephosphorization, desulfurization is very high. Intermediate frequency electric furnace is a kind of will power freque

  • Categories:News
  • Author:
  • Origin:
  • Time of issue:2019-06-14 13:25
  • Views:

A large number of industrial gases such as oxygen, nitrogen and argon are used in the smelting process of iron and steel enterprises. Oxygen is mainly used in blast furnace, melting reduction smelting furnace, converter, electric furnace smelting; Nitrogen is mainly used for furnace sealing, protective gas, steelmaking and refining, slag splashing in converter to protect furnace, security gas, heat transfer medium and system purging, etc. Argon gas is mainly used in steelmaking and refining. In order to meet the production requirements and ensure the safe and stable operation of production, large steel mills are equipped with special oxygen station and oxygen, nitrogen and argon power pipe network system.

Large-scale full-process steel enterprises are currently equipped with conventional processes: coke oven, sintering, blast furnace steelmaking, converter electric furnace steelmaking, rolling process, etc. Due to the emphasis on environmental protection and simplification of process flow, the international iron and steel industry has developed a short process process before iron in modern times - melting reduction iron making, which directly reduces iron ore raw materials into molten iron in a smelting furnace.

There is a big difference in the industrial gas required by the two different smelting processes. The oxygen required by conventional smelting blast furnace accounts for 28% of the total oxygen demand of the steel plant, and the oxygen required by steelmaking accounts for 40% of the total oxygen demand of the steel plant. However, the smelt-reduction (COREX) process requires 78% of the total amount of oxygen needed for iron production and 13% of the total amount of oxygen needed for steel making.

The above two processes, especially the melting reduction iron making process, have been popularized in China.

Steel mill gas requirements:

The main role of oxygen supply in blast furnace smelting is to ensure a certain high temperature in the furnace, rather than directly participate in the smelting reaction. Oxygen is mixed into blast furnace and mixed as oxygen-rich air into blast furnace. The oxygen enrichment efficiency of the blast air proposed in the previous process is generally below 3%. With the improvement of the blast furnace process, in order to save coke, after the use of large coal injection process, and to meet the requirements of the blast furnace production to promote output, the oxygen enrichment rate of the blast air is increased to 5∽6%, and the single consumption of oxygen is up to 60Nm3/T iron.

Because the oxygen mixture of blast furnace is oxygen-rich air, the purity of oxygen can be low.

The oxygen in the melting reduction steelmaking process needs to be involved in the smelting reaction, and the oxygen consumption is directly proportional to the steel production. The oxygen consumption in the melting reduction furnace is 528Nm3/t iron, which is 10 times of the oxygen consumption in the blast furnace process. The minimum oxygen supply required to maintain production in the melting reduction furnace is 42% of the normal production amount.

The oxygen purity required by the melting reduction furnace is greater than 95%, the oxygen pressure is 0.8∽ 1.0MPa, the pressure fluctuation range is controlled at 0.8MPa±5%, and the oxygen must be ensured to have a certain amount of continuous supply for a certain time. For example, for the Corex-3000 furnace, it is necessary to consider the liquid oxygen storage of 550T.

Steelmaking process is different from blast furnace and melting reduction furnace smelting method. Oxygen used in converter steelmaking is intermittent, and oxygen is loaded when blowing oxygen, and oxygen is involved in smelting reaction. There is a direct proportional relationship between the amount of oxygen needed and steelmaking output.

In order to improve the service life of the converter, nitrogen slag splashing technology is generally adopted in steel mills at present. Nitrogen is in intermittent use, and the load is large during use, and the required nitrogen pressure is greater than 1.4MPa.

Argon is needed for steelmaking and refining. With the improvement of steel varieties, the requirements for refining are higher, and the amount of argon used is gradually increasing.

The nitrogen consumption of the cold rolling mill is required to reach 50∽67Nm3/t per unit. With the addition of the cold rolling mill in the steel rolling area, the nitrogen consumption of the steel mill increases rapidly.

Electric furnace steel-making mainly uses arc heat, and the temperature in the arc action zone is as high as 4000℃. Smelting process is generally divided into melting period, oxidation period and reduction period, in the furnace can not only cause oxidation atmosphere, but also can cause reducing atmosphere, so the efficiency of dephosphorization, desulfurization is very high. Intermediate frequency electric furnace is a kind of will power frequency 50 hz alternating current into intermediate frequency (above 300 hz - 1000 hz) power supply device, the three-phase alternating current (ac) power frequency, after rectification into direct current, then laid adjustable intermediate frequency electric current, direct current supply by capacitance and induction coil in through the intermediate frequency alternating current, generate high density magnetic field lines in the induction coil, induction coil, and cutting in cheng fang of metal materials, produce a lot of eddy current in the metal materials. Single oxygen consumption up to 42∽45 Nm3/t.

Open hearth steelmaking process with raw materials: (1) iron and steel materials such as pig iron or molten iron, scrap; ② oxidants such as iron ore, industrial pure oxygen, artificial rich ore; ③ slagging agent such as lime (or limestone), fluorite, ettringite, etc.; ④ deoxidizer and alloy additives.

Oxygen effect to provide oxidizing atmosphere, open hearth smelting indoor combustion gas (furnace gas) contains O2, CO2, H2O, etc., at high temperature, strong oxidizing gas to the molten pool oxygen supply up to 0.2 ~ 0.4% of the weight of the metal per hour, oxidation of the molten pool, so that the slag always has a high oxidation.

Tip: oxygen supply by furnace gas alone, the speed is slow, adding iron ore or oxygen blowing can accelerate the reaction process.

Features of oxygen used in steel mills: oxygen release and peak adjustment with oxygen.

How to meet the oxygen demand of steel mills? Generally, the following ways are adopted to meet the requirements:

* Adopts variable load, high degree of automation of advanced control, to reduce the oxygen release, can be multiple sets of combination

* Multiple groups of peak-regulating spherical tanks are used in the traditional way to increase the buffering strength, so that the total amount of oxygen used in a certain period of time is stable, which can reduce the amount of oxygen release and reduce the size of the device

* At the low point of oxygen use, the excess oxygen is extracted by liquid oxygen extraction; When the oxygen peak is used, the amount of oxygen is compensated by vaporization. When the external pumping capacity of liquid oxygen is not limited by the cooling capacity, the external liquefaction method is adopted to liquefy the released oxygen and the vaporization method is adopted to vaporize the liquid oxygen

* Adopt a number of steel mills connected to the grid for gas supply, which makes the total oxygen supply scale stable according to the different time points of gas consumption

Matching process of air separation unit

In the development of oxygen station process plan needs to unit capacity, product purity, conveying pressure, booster process, system security, overall layout, noise control to do special certification.

Large steel mills with oxygen, for example, the annual output of 10 million tons of steel blast furnace process with oxygen to achieve 150000 Nm3 / h, the annual output of 3 million tons of steel smelting reduction furnace process with oxygen to achieve 240000 Nm3 / h, form a complete set of mature very large air separation devices are now a 6 ∽ 100000 grade, when choosing device size should be from the total investment in equipment and operation energy consumption, maintenance spare parts, covers an area of consideration.

Oxygen calculation for steelmaking in a steel mill

For example, a single furnace has a cycle of 70min and a gas consumption time of 50min. When the gas consumption is 8000Nm3/h, the (continuous) gas production of the air separation unit is required to be 8000× (50/60) ÷ (70/60) =5715Nm3/h. Then 5800Nm3/h can be selected as air separation device.

The general tonnage of steel with oxygen is 42-45Nm3/h(per ton), the need for both accounting, and this shall prevail.

At present, the production capacity of China's iron and steel enterprises has jumped to the forefront of the world, but special steel, especially some important fields related to the national economy and people's livelihood of steel is still dependent on imports, so the domestic iron and steel enterprises led by Baowu Iron and Steel Factory still have a long way to go, for the breakthrough of advanced and sophisticated fields is particularly urgent.

In recent years, the demand for air separation products in the steel industry has become more and more diversified. Many users need not only oxygen, but also high-purity nitrogen and argon gas, or even other rare gases. At present, Wuhan Iron and Steel Co., Ltd., Shougang and other major steel mills have several sets of fully extracted air separation devices in operation. The by-product noble gas of air separation devices can not only meet the demand of national production, but also bring great economic benefits.

With the large-scale development of steel mills, instead of supporting air separation unit is toward large-scale and air separation industry after decades of development, domestic air separation companies are also positive to catch up with the world's leading enterprises, domestic suppliers, represented by hangyang co and other air separation plant has developed 8-120000 grades of large air separation equipment, domestic rare gas device has also been successful research and development, the electronic Air China started relatively late, but also is in intensify research and development, believe that with the progress of science and technology, gas separation industry in China will go abroad, towards the world.

推荐新闻

Working principle of nitrogen making machine

PSA pressure swing adsorption nitrogen production mechanism nitrogen principle Carbon molecular sieve can absorb oxygen and nitrogen in the air at the same time, and its adsorption capacity also increases with the increase of pressure, and at the same pressure oxygen and nitrogen equilibrium adsorption capacity has no obvious difference. Therefore, it is difficult to complete the effective separation of oxygen and nitrogen only by the change of pressure. If further consideration is given to adsorption rates, the adsorption properties of oxygen and nitrogen can be effectively distinguished. The diameter of oxygen molecules is smaller than that of nitrogen molecules, so the diffusion rate is hundreds of times faster than that of nitrogen, so the speed of carbon molecular sieve adsorption of oxygen is also very fast, adsorption of about 1 minutes to reach more than 90%; At this time, the amount of nitrogen adsorption is only about 5%, so the adsorption is mostly oxygen, and the rest is mostly nitrogen. In this way, if the adsorption time is controlled within 1 minute, you can initially separate oxygen and nitrogen, that is to say, adsorption and desorption are achieved by pressure difference, when the pressure increases adsorption, desorption when the pressure drops. The distinction between oxygen and nitrogen is based on the adsorption speed difference between the two, through the control of adsorption time to achieve, the time control is very short, oxygen has been fully adsorbed, and nitrogen has not yet had time to adsorption, stopped the adsorption process. Therefore, pressure change and time control for nitrogen production by pressure swing adsorption should be within 1 minute.
2019-09-29

Air compressor terminology and related knowledge

(1), pressure: the pressure referred to in the compressor industry refers to pressure (P) Ⅰ, standard atmospheric pressure (ATM) Ⅱ, working pressure, suction, exhaust pressure, refers to the air compressor suction, exhaust pressure ① The pressure measured with atmospheric pressure as the zero point is called surface pressure P(G). ② The pressure with absolute vacuum as the zero point is called the absolute pressure P(A). The exhaust pressure usually given on the compressor nameplate is the gauge pressure. Ⅲ, differential pressure, pressure difference Ⅳ, loss of pressure: pressure loss Ⅴ, air compressor, the commonly used pressure unit conversion: 1MPa (MPa) =106Pa (PASCAL) 1bar (bar) =0.1MPa 1atm (standard atmospheric pressure) =1.013bar=0.1013MPa Usually in the air compressor industry, "kg" refers to "bar". (2), nominal flow: nominal flow in China is also known as the displacement or nameplate flow. Generally speaking, under the required exhaust pressure, the gas volume discharged by the air compressor per unit time is converted to the intake state, which is the volume value of the suction pressure and suction temperature and humidity at the first stage of the intake pipe. Unit time refers to one minute. That is, the suction volume Q= CM *λ*D3*N=L/D*D3N L: Length of rotor D: Diameter of the rotor N: The shaft speed of the rotor CM: Coefficient of profile line Lambda: length to diameter ratio According to the national standard, the actual exhaust volume of air compressor is ± 5% of the nominal flow. Reference state: a standard atmospheric pressure, temperature 20℃, humidity is 0℃, this reference state in the United States, Britain, Australia and other English-speaking countries T =15℃. Europe and Japan T =0℃. Standard condition: one standard atmosphere, temperature 0℃, humidity 0 If converted to base state, the unit is :m3/min (cubic per minute) If converted to standard state, the unit is :Nm3/min (standard square per minute) After 1 m/min = 1000 l/min 1 nm after/min after = 1.07 m/min (3) Oil content of gas: Ⅰ, per unit volume of compressed air in the oil (including oil, suspended particles and oil steam), the quality of the conversion to off the pressure of 0.1 MPa, temperature is 20 ℃ and relative humidity of 65% the value of the standard atmospheric conditions. Unit :mg/m3 (refers to absolute pair value) Ⅱ, PPM said a trace substances content in the mixture of symbols, refers to the number in every one million hundreds million (weight than PPMw and volume than PPMv). (referring to the ratio) Usually we refer to PPM as the weight ratio. (One millionth of a kilogram is a milligram) 1PPMW =1.2mg/m3(Pa =0.1MPa, t=20℃, φ=65%) (4) Specific power: refers to the power consumed by a certain volume flow of the compressor. It is a kind of index to evaluate the compressor performance under the same gas compression and the same exhaust pressure. Specific power = shaft power (total input power)/ exhaust (kW/m3·min-1) Shaft power: The power required to drive the shaft of the compressor. P axis =√3×U×I× COS φ(9.5)×η(98%) motor ×η drive (5), electrical and other terms Ⅰ, power: current per unit time to do the work (P), the unit is W (watt We usually use kW (kilowatt), but also horsepower (HP) 1 KW HP1HP = 1.34102 = 0.7357 KW Ⅱ, current: electronic under the action of electric field force, there are rules of move in one direction When it moves, it forms A current in A amperes. Ⅲ, voltage: just because have head and water flow, there is also a potential difference, It is called voltage (U), and the unit is V (volts). Ⅳ, phase, refers to the wire, three phase four wire: refers to the three phase thread (or wire) The center line (or zero line), single phase refers to a phase line (or fire line) Root center line (or zero line) Ⅴ, frequency: alternating current (ac) to complete the electromotive force of the positive and negative transformation cycles a second number, use (f), according to the unit - Hertz (Hz) of 50 Hz alternating current frequency in our country, abroad is 60 Hz. Ⅵ, frequency: change the frequency, in air compressor application, by changing the frequency of the power to change the speed of the motor, so as to achieve the purpose of flow adjustment. The flow rate can be adjusted to 0.1bar by frequency conversion, which greatly reduces idle work and achieves the purpose of energy saving. Ⅶ, controller: there are two main types of controller in industry: instrument type and PL System, we use PLC controller, is a kind of by A programmable controller composed of single chip microcomputer and other components. Ⅷ, straight league: direct connection, in t
2019-09-29

Air compressor room size design matters needing attention

A lot of air compressor users ignore the importance of the design of air compressor room. They think that the air compressor is installed there as long as it is not in the way. But in the late stage, they have learned the bitter fruit of unreasonable design of air compressor room. In summer, air compressor room heat dissipation is not good, and high temperature of air compressor frequently occurs; Air compressor maintenance is not convenient; The construction of waste heat recovery engineer of air compressor is not convenient, so we should ensure that the design of air compressor in the air compressor room is reasonable. If you are an engineer, what will you remind your users to pay attention to in the design of air compressor room? 1. Before the design of air compressor room, it is necessary to understand the design specification and matters needing attention of air compressor room. 2. Choose a place with low relative humidity, less dust, clean air and good ventilation. If the ambient temperature is too high (greater than 45℃), it is recommended to take cooling measures (such as avoiding direct sunlight, opening doors and Windows, etc.) to avoid unnecessary high-temperature shutdown; If the ambient temperature is low (less than 0℃), the freezing point temperature of the lubricating oil must be controlled above the ambient temperature. Consider not only summer low temperatures, but also winter low temperatures, and think long term. 3. If the factory environment is poor and dusty, a ventilation duct should be installed to lead the intake end to a place where the air is relatively clean. The installation of the conduit must be easy to disassemble and assemble for maintenance. The installation size should refer to the external size of the air compressor. 4. There must be enough space around the air compressor for other parts to enter and leave. There must be at least a distance of more than 1500mm between the air compressor and the wall. As far as possible with lifting equipment. The distance between the air compressor and the top space is more than 1500mm. In a word, the design of air compressor room should come from the gas demand that you want to meet, and can not be strictly in accordance with the book knowledge. But the basic matters needing attention should be understood and applied to the actual design of the air compressor room.
2019-09-29

The operation of argon production in air separation unit is complicated.

Total rectification of argon is to separate oxygen from argon in a crude argon column to obtain crude argon with oxygen content less than 1×10-6 directly, and then separate it from fine argon to obtain fine argon with purity of 99.999%.   With the rapid development of air separation technology and the demand of market, more and more air separation units adopt the process of producing argon without hydrogen to produce high purity argon products. However, due to the complexity of argon production operation, many air separation units with argon did not lift argon, and some units in operation of argon system were not satisfactory due to the fluctuation of oxygen use condition and the limitation of operation level. Through the following simple steps, the operator can have a basic understanding of producing argon without hydrogen!   Commissioning of argon making system   * V766 in full opening process before discharging coarse argon column into fine argon column; Liquid blowout and discharge valves V753 and 754 at the bottom of crude argon tower I (24 ~ 36 hours). * Full opening process argon out coarse argon tower I defining argon tower valve V6; Non-condensing gas discharge valve V760 at the top of the argon tower; Precision argon tower, liquid blowing at the bottom of precision argon measuring cylinder, discharge valves V756 and V755 (precooling precision argon tower can be carried out at the same time as precooling coarse argon tower).   Check the argon pump   * Electronic control system -- wiring, control and display are correct; * Sealing gas -- whether the pressure, flow, pipeline is correct and does not leak; * Motor rotation direction -- point motor, confirm the correct rotation direction; * Piping before and after the pump -- check to make sure the piping system is smooth.   Check the argon system instrument thoroughly   (1) Rough argon tower I, Rough argon tower II resistance (+) (-) pressure tube, transmitter and display instrument is correct; (2) Whether all liquid level gauge (+) (-) pressure tube, transmitter and display instrument in argon system are correct; (3) Whether the pressure tube, transmitter and display instrument are correct at all pressure points; (4) Whether the argon flow rate FI-701 (the orifice plate is in the cold box) (+) (-) pressure tube, transmitter and display instrument are correct; ⑤ Check whether all automatic valves and their adjustment and interlocking are correct.   Main tower working condition adjustment   * Increase oxygen production under the premise of ensuring oxygen purity; * Control the lower column oxygen-rich liquid empty 36 ~ 38% (liquid nitrogen restricts into the upper column valve V2); * Reduce the expansion amount under the premise of ensuring the main cold liquid level.   Liquid in coarse argon column   * On the premise of further precooling until the temperature of the argon tower no longer drops (the blowout and discharge valves have been closed), the liquid air is slightly opened (intermittently) and flows into the condensing evaporator valve V3 of the crude argon tower I to make the condenser of the crude argon tower intermittently work to produce backflow liquid, cool the packing of the crude argon tower I thoroughly and accumulate in the bottom part of the tower; Tip: When opening the V3 valve for the first time, pay close attention to the pressure change of PI-701 and do not fluctuate violently (≤ 60kPa); Obact the liquid level LIC-701 at the bottom of crude argon tower I from scratch. Once it rises to 1500mm ~ full scale range, stop precooling and close V3 valve.   Precooling argon pump   * Stop valve before opening the pump; * Blow out the valve V741 and V742 before opening the pump; * slightly open (intermittently) the pump after blowing off valve V737, V738 until the liquid is continuously ejected. Tip: This work is carried out under the guidance of argon pump supplier for the first time. Safety issues to prevent frostbite.   Start the argon pump   * Fully open the return valve after the pump, fully close the stop valve after the pump; * Start argon pump and fully open the back stop valve of argon pump; * Observe that the pump pressure should be stabilized at 0.5 ~ 0.7Mpa(G).   Crude argon column   (1) After starting the argon pump and before opening the V3 valve, the liquid level of LIX-701 will decrease continuously due to the liquid loss. After starting the argon pump, the V3 valve should be opened as soon as possible to make the condenser of the argon tower work and produce backflow liquid. (2) V3 valve opening must be very slow, otherwise the main tower conditions will produce large fluctuations, affecting the purity of oxygen, crude argon tower after work to open the argon pump delivery valve (opening depends on the pump pressure), the final delivery valve and return valve to stabilize the FIC-701 liquid level; (3) The resistance of two crude argon columns is observed. The resistance of
2019-06-10
Zhejiang Zhongyi Gas Technology Co., Ltd.

Tel: 0086 0571-63372200    Fax: 0571-61779389

Mobile phone: 0086 13162819320

Email: sales@shanghaihcg.com

Address: No. 1160, Gongwang Road, Jinqiao Industrial Park, Fuyang District, Hangzhou

Copyright @2021 Zhejiang Zhongyi Gas Technology Co., Ltd. 编号:浙ICP备18052687号-4

Zhejiang Public Network Security No. 33018302001074

Website support: China Enterprise Power Hangzhou

Zhejiang Zhongyi Gas Technology Co., Ltd.

Scan and follow us