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16, grain legislation vertical silo explosion prevention and control measures

Number of visits: Date:2013-5-9

With the grain legislation silos application technology is improving, especially steel plate silo has become the mainstream grain and oil industry warehouse type. However, nearly 20 years of grain legislation silos in grain and oil processing plants, feed plant dust explosion accident rate is on the rise. It is reported that in some advanced technology and equipment developed countries, dust explosion is very serious. Dust explosion not only brings environmental pollution, more importantly, caused serious casualties and major economic losses. Therefore, to take safe and effective prevention and control measures to prevent dust explosion, it is necessary, should cause people to pay enough attention. I believe that from the design to start, consider a variety of factors, to take comprehensive prevention and control measures to achieve effective control of dust, to prevent the occurrence of dust explosion.
1. Strengthen management, raise awareness and enhance accountability

1.1 to strengthen the silo explosion and safety knowledge of education, and actively carry out safety training, strengthen the dust, fire and explosion awareness, develop a strict safety system and strictly abide by, in strict accordance with the operating procedures, and actively do a good job inside and outside the reservoir clean, Keep good ventilation in the silo. At the same time do a good job of daily safety management.

1.2 do a good job of comprehensive safety inspection work, you must carefully analyze the dust explosion of various risk factors, security checks to be comprehensive and targeted, find the problem in a timely manner, never leave any hidden dangers.

1.3 Strengthen the provision and management of safety facilities. The reservoir area to have a complete fire system; operators to be familiar with the equipment and the use of tools, performance conditions and operating methods, and do a good job of conservation work; is strictly prohibited in the absence of fire conditions, in the reservoir area for electrical cutting Welding and other easy to produce heat source operation. When such operations are required, a more secure precaution should be taken. After the end of the operation, to do a thorough inspection to eliminate all risks, to ensure that the storage of grain storage safety.

2. From the design to start, try to eliminate the factors that affect the dust explosion

2.1 do the overall planning and design of the reservoir area, follow the principle of overall fortification. (Such as: firewall, green belt, fire doors, etc.), and the appropriate use of fire protection materials; on the lightning protection, the use of fire prevention equipment, the use of fire prevention equipment, Grounding, anti-static and fire design, should be fully considered, to take safe and reliable preventive measures.

2.2 in the vertical silo of the structural design, vertical silo should be set up ventilation windows, vent holes, check holes and other safety devices to keep the warehouse pressure; silos and silos should be set in the material level, in order to issue full warehouse signal (Such as: corridors, trestles, etc.), set the explosion-proof window, in order to achieve the purpose of vent; use lightning rod or lightning belt and so on.

2.3 Ventilation and dust removal process design. Reasonable ventilation and dust removal process to prevent dust explosion play a positive role. It is important to choose the right parameters and methods at design time. Wind speed is 15-17m / s is better; in the dust generation point directly collected by the dust collector after the discharge to the outside; the use of local exhaust and suction combined with the way, full ventilation or natural ventilation (the use of external pressure Or temperature difference). At the same time, taking into account the uniformity of the negative pressure inside the suction pipe, grain, dust particles, equipment and their collision between each other, friction, the uniformity of the speed within the pipeline, the outlet should be set hood. Design wind network, to stone, cleaning and other equipment should be designed independently of the wind network, transportation and upgrading system should be set up combined network. Ventilation and dust removal system should be interlocked with the relevant electrical equipment.

Try to use dust cover, protective cover. Select the appropriate point of suction and windshield structure, especially on the grain parts, so that when the grain with the outside world to form a wind belt to prevent dust flying. Install the dust cover near the dust source, so that the dust is limited to a small range, that is sufficient to ensure that the suction hood has enough negative pressure, and will not cause dust diffusion. The airflow inside the uniform, shrinkage angle of not more than 60 °, wind speed generally selected 3-5m / s (grain), 0.5-1.5m / s (powder). Dust concentration, the proportion of large, suction and dust from the long distance, the suction wind speed should take a large value, and vice versa take a small value. Otherwise it will make dust flying spread serious. Dust cover around the flange, should reduce the ineffective airflow, suction capacity can save 25%, the design of wind speed can be used 0.5-2.5m / s. Due to process restrictions, mechanical equipment can not be sealed when the use of open suction hood and external suction hood. Fan and other suction openings should have a protective cover.

2.4 food transport process design, the process should be short, the equipment selection and rational layout, with dust and explosion-proof supporting device and try to seal, try to use magnetic separation equipment. Dust concentration should be used in the higher part of the secondary purification. Belt conveyor feeding end, throwing side must design a reasonable dust cover. Cloak of the conveyor due to the use of unloading car, dust source is flowing, should be designed a reasonable dust-proof device. Bucket elevator should be installed in the base of the suction device and the use of conductive and non-flammable tape, the bucket should adopt the plastic type. Screw conveyor structure is more stringent, generally do not have dust-proof device, but the grain gap is large, should be in the lower part of the suction hood to expand the box. Bucket elevator, conveyor and other transportation equipment should be equipped with speed detection device, spray fire equipment, conveyor belt slip and deviation and other devices. In the climate and operating conditions permit, the warehouse scraper, lifting head, dust and other open-air layout. All mechanical and electrical equipment to take grounding measures to prevent static accumulation.

2.5 electrical design, lighting, wire selection of the correct specifications model, should be used explosion-proof, to "explosion and fire danger environment design specifications," the third chapter of the requirements and related standards. The motor should adopt the vibration damping device, reduce the dust flying and spread. Design, should follow the principle of the overall fortification, do a good job supporting the design of dust and explosion.

3. The use of dust and explosion-proof new technology

Spray dust suppression technology not only improve the current dust control methods, but also broaden the existing dust prevention and control of new ideas. The technology for the particle size of 30 μm below the fine dust to play a better inhibitory effect, the dust and the process of renewable dust adsorption on the grain surface, to avoid flying, is conducive to fundamentally control the dust explosion. According to the relevant information, the United States Esso produced white oil as a dust agent, the use of the dose of 0.02% of the material flow of the spray, so that the dust in the grain can be effectively controlled. In the world, many developed countries have been widely used in food storage and management of this new technology, and achieved good results. But the technology needs to be further studied and improved. In addition, the application of "spray water mist explosion-proof dust technology", can effectively inhibit the dust flying, dust suppression effect is better, more suitable for grain and oil processing plants and grain transfer library.

In addition, in order to effectively prevent the grain silo dust explosion, in the active take dust explosion-proof measures at the same time, should also strengthen the use of the process of dust explosion-proof technology management and technical training.

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