Causes and prevention of fire in the production of

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Causes and prevention of fire in steel barrel spraying production

when visiting the international packaging exhibition at Beijing International Packaging Exhibition Center, I was lucky to meet several colleagues who are well-known in the metal container packaging industry. It was particularly cordial to meet you. As we haven't seen each other for several years, we decided to find a teahouse to sit down and chat. In the chat, the most talked about is the situation of the steel barrel spray drying room. A Jun said, "a fire broke out in the barrel spray drying room of our factory last month, and the profits and losses were put out in time, without causing big losses". B Jun said, "such a fire also occurred in the spraying and drying room of our factory, but it was in the month of safe and civilized production at that time, and the loss was not large, so it was not announced.". C Jun said, "there was a fire in the drying room of our factory, but it was not as lucky as you said. There was a fire in the drying room of our factory. Due to improper fire fighting methods, the explosion finally occurred, and the direct economic loss was more than 1 million yuan. It also injured two workers and killed one person. The loss was terrible, which was beyond our endurance.". D Jun said, "I heard that the drying room of a barrel factory in Xinjiang also exploded, and the loss was also great..."

what is the reason why the steel barrel spraying drying room is so prone to fire

I. overview of steel barrel spray drying trunk line

in recent years, with the increasing market competition, in order to compete for the market, in addition to improving the quality of the steel barrel itself, all barrel manufacturers across the country have invested in the appearance coating of the steel barrel, spending a lot of money to change the appearance quality of the steel barrel. For this reason, equipment for cleaning, spraying, drying and conveying production lines of the outer surface of steel barrels have been built in various barrel manufacturers across the country. Due to the different economic conditions of various manufacturers, the production lines built are mixed. But the general structural principle is basically the same. Electrostatic spray paint and high-pressure airless spray paint are mostly used; Cleaning methods include immersion cleaning and spray cleaning; There are vertical and horizontal drying kilns, most of which are dried by far-infrared radiation

due to the different quality of cleaning, spraying and drying production lines of various manufacturers, some are purchased in sets; Some are single piece purchase and self assembly, which effectively reduces the failure rate; Some are designed and made by ourselves. Therefore, the production capacity of the production line is also different, and the problems in the production process are also different

II. Cause analysis of fire in steel barrel spray drying line

there are various causes of fire in steel barrel spray drying line, which can be summarized as follows:

problems left over from engineering design and construction

in the process of engineering design and construction, the biggest remaining problem is not to make building fire separation. The whole steel barrel spray drying room, some 1000 square meters, and some thousands of square meters of workshops are not separated, so there is nothing to do when a major fire occurs, and the economic losses are serious. During the construction of some drying furnaces, the quality is poor, and the connectors of electric heating elements in the furnace are in poor contact, resulting in ignition, which is very easy to cause fire. In addition, the quality of the induced draft and gas filtration device of the drying furnace is poor or unstable, which often loses its function, resulting in the explosion of combustible gases in the furnace that cannot be discharged in time and exceed the allowable concentration

problems left over from process design

in process design, many manufacturers ignored the explosion-proof requirements of electrical equipment, and placed the electrical equipment that did not meet the explosion-proof requirements between the two drying channels of the drying room without isolation. Due to the open fire generated by the electrical equipment during operation, the drying room caught fire or exploded. The design power of some drying furnaces is too small to meet the temperature required for drying, with a year-on-year increase of 3.8%. To achieve the purpose of drying, the temperature is often increased by not opening the induced draft, so that the concentration of combustible gas in the furnace is too high and explosion occurs. Some drying furnaces are designed with too much power, which not only wastes energy, but also often exceeds the flash point of combustible gas in the furnace due to out of control temperature, resulting in fire

problems existing in the spraying and drying equipment itself

most of the main parts and components of the spraying and drying equipment are electrical components, and many of the current electrical components do not meet the quality requirements, such as the thermocouple does not measure the actual temperature of the drying kiln, some quality accidents caused by insufficient silicon carbide coating on the far-infrared radiation plate and radiation tube in the drying channel, as well as high-voltage electrostatic generator The quality problems of the electrical components in the electrostatic spraying machine and the control cabinet are the direct factors causing the fire. According to the statistics of the Fire Department of the Ministry of public security, the catastrophic fire caused by the quality problems of the electrical components in the coating fire accounts for 25% of the coating fire

management problems

due to the slow development of China's steel barrel industry and weak technical force, there are fewer high-quality management talents. In the steel barrel industry, few intellectuals have received higher education and participated in grass-roots management. At present, most of the grass-roots management are junior high school graduates in the early 1970s. Therefore, in the process of management, people who do not comply with the operation plan, operating procedures and safety and fire prevention system are everywhere. For example, a barrel making enterprise in the north, due to problems in the pre cleaning of cleaning and spraying drying trunk lines, needs to carry out small-scale transformation, but cannot affect the normal production of the workshop. Therefore, the factory Department decided to transform the maintenance workshop after work. The maintenance workshop needs to use electric welding machines and acetylene gas in the transformation process, but they believe that after work, no one cares, and they start gas cutting and welding without going through the fire procedures and making any fire protection preparations. As it was not long after work, the smoke and dust in the workshop had not been completely distributed, and the slag fell into a pile of residual paint during welding, causing a fire; There is also a barrel making enterprise. In the process of internal barrel coating, the operator forgot to turn on the induced draft fan, which made the concentration of organic solvent in the drying room accumulate more and more, and finally caused an explosion, injuring two operators at the mouth of the drying kiln. There are many such cases in barrel manufacturing enterprises, so we won't list them one by one

employees lack basic safety quality

due to the lack of basic safety quality, the safety concept is weak. Although the factory headquarters repeatedly emphasized the importance of safety and required that mobile smoking be prohibited in the factory, the company in the production area called this kind of extension SG extension no smoking, and formulated provisions such as fines for cigarette butts found in the production area. However, the employees turn a blind eye and go their own way. In the drying room and outside, they can often see cigarette butts that have been smoked. What's more, they even put the steel cylinder filled with liquefied gas in the drying room, which is a direct hidden danger of fire

III. Prevention of fire and its preventive measures

above, we analyzed the reasons why steel drum cleaning and spraying drying lines are prone to fire, so how to prevent it? Let's start from several aspects

1. The newly-built or under construction steel barrel coating production line must comply with the provisions of the "three Simultaneities" system of capital construction safety. For the production lines that have been built and are in use, they must be separated according to the safety and fire protection regulations, and the control operation room and painting operation room must be separated. Ensure safe and civilized production and the implementation of relevant national safety laws, regulations and standards

2. Establish and improve the safety supervision mechanism in the whole process of capital construction, new product development and technological transformation within the enterprise. From architectural designers, product designers, constructors, equipment manufacturers to equipment operators on the production site, safety and fire protection education should be carried out to improve their safety and fire protection awareness. And on this basis, establish a safety supervision mechanism within the enterprise to supervise the whole activity process of the enterprise

3. In order to improve the basic safety quality of enterprise employees, regular and irregular safety education for employees and education on fire awareness, fire control and common sense of fire control should be carried out. We should always remind employees to establish the ideology of safety first. But this is not to say that nothing can be done, but that employees should be bold and careful in doing their work, do it skillfully rather than recklessly. With the continuous progress of society and the rapid development of technology, professional safety technology education should be carried out to improve the safety technology quality of employees

4. Gradually implement the safety contract system among employees. Make everyone understand their own safety, especially the workers on the cleaning, spraying and drying production lines. They must understand the importance of safe and civilized production and fire prevention, as well as the consequences of fire and their preventive measures

5. Find ways to improve the overall safety level and overall technical level of cleaning, spraying and drying equipment in the barrel industry. Limit and eliminate the spraying and coating process of spraying thinners that are dangerous and seriously affect the personal health of operators. Implement the production license system for equipment manufacturers making cleaning, spraying and drying production lines, and promote safety certification. In the internal management of the enterprise, the cleaning, spraying and drying production lines are listed as key fire zones, and the monitoring, supervision and inspection work are effectively strengthened

(author/Xin qiaojuan)

China steel drum packaging

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