Chemical safety production faces challenges in the

2022-08-15
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In the early winter, the safety production of chemical industry was challenged.

in recent days, most of the central and eastern regions of China have experienced obvious rain and snow. On November 11, according to the continuous Blizzard forecast released by the Central Meteorological Observatory, there will be a strong wind and cooling weather process in Shaanxi, Shanxi, Hebei, Henan and Shandong. Experts stressed that bad weather has brought great impact on chemical safety production, making winter production, which is prone to accidents, face more severe challenges. Industry experts remind enterprises that they should increase various preventive measures, especially strengthen on-site patrol inspection and device insulation work, so as to ensure safe production in severe cold weather, so as to avoid unnecessary losses to enterprises caused by accidents

according to the data, winter is a period of frequent enterprise accidents in the four seasons of the year. Experts believe that the frequent occurrence of accidents in winter, in addition to some enterprises' insufficient understanding of safety production and the obvious tendency to passively focus on safety production, another main reason is the poor implementation of the winter patrol inspection system by enterprises from the main person in charge to ordinary employees. When sorting out relevant accidents, professionals found that the characteristics of winter accidents in chemical enterprises were extremely obvious, mainly manifested in the fact that the personnel on duty neglected the on-site patrol inspection and device insulation, did not find the signs of accidents in time, and finally led to serious equipment accidents and personal injury accidents

on November 4, affected by the strong cold air in the north, the temperature in Jiangsu fell sharply. An explosion occurred in the polymerization process 9# polymerizer of a chlor alkali enterprise in Jiangsu at about 7 p.m. that night, resulting in 12 casualties and crushing collapse of some plants, resulting in direct economic losses of hundreds of thousands of yuan. After investigation, the cause of the accident was that during the process of heating up the 9# polymerization kettle, Li, the worker on duty watching the kettle, was afraid of cold and did not go to the kettle for necessary patrol and supervision. Due to the continuous overtemperature and overpressure of the kettle, the manhole gasket of the kettle body was broken, and vinyl chloride overflowed. The concentration of vinyl chloride in the plant instantly reached within the space explosion value, and then exploded, causing disaster

the process needs to be modified and verified repeatedly. In view of the characteristics of chemical production such as high temperature, high pressure, flammability and explosion, many safety prohibitions and rules and regulations are needed to guarantee in the actual operation process, among which "strictly implement patrol inspection" is one of the first "six stricts" in chemical operation. The intention is to require the staff on duty not only to operate in accordance with the operating procedures, but also to regularly inspect the operation of the equipment and focus on processing materials, and actively capture the "clues" of any unsafe factors in the production system, so as to achieve early detection and prevention. Otherwise, the probability of similar accidents will greatly increase

Wu chaopeng, director of the safety department of Jiangsu Runjia Oriental Chemical Co., Ltd., said: "There are subjective and objective factors for the staff on duty to relax the patrol inspection in winter. The subjective factor is mainly carelessness. They think that the production equipment operates every day. How can it be so coincident that it breaks down when they catch up with their duty? In addition, the weather is cold, and the staff inertia comes with it; objectively, under the severe cold weather conditions, the lubrication system, transmission system and pipeline valves of the production device are very easy to break down."

according to Wu chaopeng, employees are negligent in patrol inspection and can't find the omen of equipment failure and pipeline frost crack in time, which will delay production in light cases and cause serious accidents in serious cases. Chemical production is characterized by long pipelines, many open-air layouts, and various valve installations everywhere. According to the process regulations, many pipelines and valves need insulation, which is first of all to prevent the medium from freezing and affecting the transmission; The second is to prevent pipelines and valves from freezing and cracking, so as to avoid losses or dangers caused by medium overflow. "Without patrol inspection, problems cannot be found at the first time, and small problems may lead to disastrous consequences." Wu chaopeng said

CCIN learned that it is difficult to count the cases of shutdown and emergency repair caused by a frost crack on a pipeline or valve in chemical enterprises; There are also numerous major accidents such as poisoning and explosion caused by toxic and flammable materials overflowing from the frost cracked pipe valve. For example, in a petrochemical enterprise in Jilin, due to the cold weather, the crude oil in the casing crystallizer condensed, making the equipment unable to operate normally. The worker on duty used steam to flush, resulting in a sharp rise in the temperature in the casing, causing the liquid ammonia in the casing to spray out, and the operator was washed down in the oil pool and died on the spot. The water washing tower in the compression workshop of a small chemical fertilizer plant exploded due to brittle fracture at the edge of the third floor of the tower caused by low temperature, causing a major malignant accident. In this regard, experts pointed out that chemical enterprises should learn from the lessons, prevent equipment, pipelines and valves from freezing and cracking, and take effective thermal insulation measures to strictly prevent raw materials from condensation

it is reported that the frequent fires in chemical enterprises in winter are also closely related to the lack of patrol inspection. In winter, the weather is dry and often accompanied by strong winds, which is very prone to fire. On December 28 last year, a phosphate enterprise set up an induced draft fan on the floor of the plant. Because the operator on duty was afraid of the cold, he gave up the inspection, causing the unit to run out of lubricating oil, the induced draft fan to overheat, causing a fire, and the large motor and induced draft fan were burned

for the phenomenon of frequent fires in chemical enterprises in winter, Zhuang Wendong, chief of the safety department of Limin Chemical Co., Ltd., reminded enterprises to pay attention to fires caused by heating. He believed that fires caused by various enterprises' various heating methods in winter, poor management or improper operation have occurred from time to time. "Enterprises must strengthen the implementation of seasonal fire prevention measures for the construction of new material utilization demonstration lines in winter, especially the complete elimination of electric stove heating." Zhuang Wendong said

Mou Guirong, deputy director of Huai'an Safety Supervision Bureau, believes that the safety production of chemical industry in winter is not a matter for an enterprise, and its social impact is increasing, which should be paid full attention by local governments. She said that the Jiangsu Safety Supervision Bureau recently issued the "emergency notice on doing a good job in safety production in chemical enterprises in winter", reminding enterprises to carry out safety inspections at the operation site, especially to strengthen safety inspections at night, so as to find and eliminate potential accidents in time

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