Explosion accident of air separation unit at home and abroad On January 4, 1961, an air separation tower of a 4000m3/h air separation equipment in the former Federal Republic of Germany exploded, killing 15 people and seriously damaging the equipment and buildings. On November 23, 1973, the typical malignant explosion of the 3350m3/h air separation unit in Anshan Iron and Steel Oxyoxygen Plant occurred outside the tower, which also caused the explosion of the air separation base inside the tower. The equipment was destroyed in many places, and the production was resumed after six months of maintenance. On July 27, 1986, the 3200m3/h air separation equipment of Qianjin Chemical Plant of Yanshan Petrochemical Company made a loud noise, and the whole equipment became a pile of ruins. On November 1, 1992, an explosion occurred in the 150m3/h air separation tower of the oxygen station of Lanzhou Petrochemical Machinery Plant, resulting in the death of one person and the abandonment of the air separation tower. On July 25, 1993, the main condensing evaporator of 150m3/h air separation tower of Jinchuan Nonferrous Metals Company in Gansu Province suffered a crushing explosion, which killed one person on the spot and scrapped the air separation tower. On March 2, 1996, the 6000m3/h air separation equipment in Xinyu Iron and Steel Plant of Jiangxi Province, under the condition that no abnormal symptoms were found, the plate fin main condensing evaporator suddenly exploded, and the equipment was seriously damaged. The blast wave shattered the glass of the surrounding buildings. On July 18, 1996, the main cooling of the 10000m3/h air separation equipment in the air separation branch of Harbin Gasification Plant exploded, and the main cooling and upper tower were scrapped. On May 16, 1997, a malignant explosion occurred in the 6000m3/h air separation tower of Fushun ethylene chemical plant in Liaoning Province. The equipment and plant were seriously damaged,4 people died,4 people were seriously injured and 27 people were slightly injured. On December 25, 1997, a set of 81760m3/h air separation equipment of Malaysia Bintulu Shell Oil Company suffered a malignant explosion. The explosion started in the main condensation evaporator and expanded to the tower body; The lower tower is pressed into the ground; The upper tower and the main cold were blown 750 meters away; Window frames shattered within 5km and flying metal smashed oil and kerosene tanks, sparking the fire. August 21, 2000, Jiangxi Pingxiang Iron and Steel Company oxygen plant 1500m3/h air separation unit maintenance site of an explosion accident, resulting in 22 deaths, 7 serious injuries, 17 minor injuries. On July 7, 2003, when the 10000m3/h air separation equipment of Shanghai Cosco Chemical Co., Ltd. was preparing to hoist the upper column and the upper section of the coarse argon column, there was a loud noise, and the two-layer plastic color strip on the upper seal of the lower section of the coarse argon column was torn to pieces by the air waves. On August 22, 2003, the 20,00m3 /h air separation equipment in the oxygen plant of Maanshan Iron and Steel Corporation deflagrate occurred during installation, and people were ejected and 35% burned. After rescue, they escaped from the emergency. On September 17, 2003, during the installation of the 10000m3/h air separation equipment of Lengshui Iron and Steel Company in Hunan, a blast of gas burst out, and the welder was knocked out and fell off the platform. He died in the rescue. On April 10, 2017, an air separation accident occurred in Shenhua with 4 million tons of coal-to-oil The explosion occurred at 5:45 PM on July 19, 2019, in the air separation unit C of the Yima Gasification Plant of Henan Energy and Chemical Group in Sanmenxia, Henan Province. The explosion resulted in 15 deaths, 15 serious injuries and 256 hospitalizations. In recent years, with the large-scale of air separation equipment, the explosive energy of air separation equipment is also increasing. From the principle of explosion, air separation equipment can be divided into physical explosion and chemical explosion. Chemical explosions cause more harm than physical explosions. Causes of physical explosion of air separation equipment are as follows: 1. A large amount of high temperature gas enters the fractionation tower containing cryogenic liquid, and the cryogenic liquid rapidly vaporizes, resulting in increased pressure in the fractionation tower, slow pressure relief speed of the safety valve, and deformation and rupture of the air separation tower. 2, air separation, cold box is memory is cryogenic liquid of fractionating column filled with thousands of cubic perlite insulation materials, fractionating column leakage fault occurs, will have a lot of cryogenic liquid, perlite in high temperature gas, cryogenic liquid evaporation sharply, the ratio of cold box burst, a large nu