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It is understood that this is not an equipment accident caused by a problem in the main production equipment. The cause of the accident is that a gasket on the mixer is damaged, and the flammable and explosive materials cause a deflagration caused by the leakage at the damaged part. The gaskets are damaged, either due to quality defects or due to the lack of timely updates resulting in aging of the gasket.
In the chemical industry, such big accidents caused by problems with gadgets can be described as numerous. For example, in the process of transporting vinyl chloride monomer from a high tank to a polymerizer pipe, a resin plant operator in Hebei Province suddenly discovered that a large amount of white misty vinyl chloride monomer was ejected and an explosion accident occurred. The tragedy caused by the explosion caused 5 dead and 8 injuries and resulted in huge losses of property. After investigation, it was confirmed that the cause of the accident was due to the unqualified quality of the steel that was used to make the connecting flange of the monomer feed pipe, which caused the flange to crack along the circumference, and a large amount of vinyl chloride monomer leaked out and caused an explosion. A chemical company in Shandong Province caused liquid chlorine leakage due to quality problems in the procurement of valves. During more than one hour of leakage, more than 400 employees and employees around the company were affected by chlorine. 108 people were hospitalized, of whom 33 were diagnosed. Chlorine poisoning, 1 person died of complications.
It can thus be seen that in the chemical production process, small parts can cause major accidents, large losses, and occur frequently. However, because some companies usually focus their safety attention on large-scale equipment and key equipment, it is often easy to neglect the management of small parts such as flange washers and valves, eventually leading to major accidents, resulting in heavy casualties and huge losses of property.
Companies that can ensure continuous production safety are companies that do not value every security detail. "We have a strict system for the purchase of production parts. The standard is very strict. Each purchase will try to purchase the best quality and highest reliability products." Han Jingchun, deputy general manager of chlor-alkali company Shandong Jinling Group Co., Ltd., told reporters. Han Jingchun believes that in chemical production facilities, there are no important or minor equipment points, and all accessories must be valued. Otherwise, if there is a problem with the gadget, even if it does not directly lead to a serious accident, unplanned parking will result. Non-planned parking is of a sudden nature, and it is the most likely to cause disruption of the whole production chain. The systemic danger increases dramatically and poses a serious threat to safe production. “The gadgets are also a link in the entire equipment chain. Once a problem arises, it will create a 'short board' effect. The consequences are serious!†Han Jingchun emphasized.
Because chemical production has the characteristics of tight connection between upper and lower processes and strong continuity of operations, once an operation process is abnormal, the process parameters such as pressure, temperature, and flow rate in the system will change immediately, which will bring risks to the entire production operation. Control trouble. If you are unresponsive or have emergencies, there are often immediate dangers. Han Jingchun said: “In chemical production, even if a small gasket is damaged, it is enough to cause abnormalities in the process. One of the effective ways to eliminate such accidents is to act according to the system.†He explained that the core of the system is According to the use cycle of equipment and accessories, it is updated on time. He also stated that choosing high-quality equipment and accessories can extend the overhaul period moderately, increase the reliability of equipment installation operation, and be cost-effective in terms of safety and economy.
It is understood that general chemical equipment and accessories have strict standards and requirements for use. However, some companies can perform regular inspections of key equipment in service, and they cannot treat all small accessories equally. The standard is to go to stay completely judged by the overhaul experience.
"For the production of accessories, such as material valves, to test the valve before installation and use, after the installation of the system should be airtight test. After using a certain period, we must pay attention to update on time." Jiangsu Hengsheng Fertilizer Co., Ltd. Zhou Xueqiang, chief of safety and environmental protection department emphasized. Because a large number of leak-proof gaskets are used at the flanges of valves and pipes in chemical plants, the quality of the gaskets must be taken into account. It is necessary to purchase qualified products from qualified manufacturers and perform performance tests before use. The system rules to avoid extended service. Zhou Xueqiang believes that, when purchasing chemical parts, chemical companies should, in accordance with the relevant requirements of the national standards, inspect and accept the products, and then put them into production and use.
In the early morning of August 4, just one week after the “7·28†detonation accident in Nanjing, Jiangsu Changzhou Hubin Pharmaceutical Raw Material Co., Ltd. caused material leakage in the reactor gasket of the reactor in the production of chlorobenzoic acid, causing a detonation. The sky-shattering sound and instant flash of fire caused two operators to burn. The surrounding residents shattered windows and doors.