Fire and explosion prevention measures for the hot

2022-08-07
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Fire and explosion prevention measures for the pulverizing system pulverized coal in the pulverizing system is easy to burn. Therefore, the explosion-proof door of the pulverizing system should avoid facing the cable layer and the pedestrian passage. After the action of the explosion-proof door, the surrounding flames and powder accumulation should be eliminated immediately. Strictly control the outlet temperature of coal mill and the temperature of coal bunker. The temperature shall not exceed the requirements of coal 05 and environmental performance. The pulverized coal bunker shall be equipped with temperature measuring points and alarm measuring points. The powder feeder shall have a regular switching system to avoid powder accumulation and spontaneous combustion at the inlet of the stopped powder feeder. When removing the accumulated powder at the inlet of the powder feeder, oxygen pipe and compressed air shall not be used for purging

when manually measuring the pulverized coal level in the pulverized coal bunker, the pontoon shall be made of non-ferrous materials, and the pontoon in the bunker shall rise and fall slowly to avoid striking the bunker wall to produce sparks and pulverized coal explosion. It is necessary to frequently check the moisture absorption pipes of the pulverized coal bunker and the winch (spiral powder feeder) and add insulation measures to control the opening of the moisture absorption valve to keep the negative pressure of the coal bunker at an appropriate value. The outer wall of the coal silo shall be insulated and the data shall be stopped testing to ensure that the products are stopped consuming according to the expected results. When the data quality control fails, the pulverized coal in the silo is easy to agglomerate and affect the flow when the outer wall of the pulverized coal is attacked by cold air. At the same time, the coal bunker floor shall be cleaned to prevent the secondary explosion caused by the hot gas wave after the explosion of the coal bunker, or the fire entering the coal bunker after the spontaneous combustion of the accumulated powder in the coal bunker. Fixed fire extinguishing systems shall be installed, such as steam fire extinguishing, carbon oxide fire extinguishing or nitrogen fire extinguishing devices which can be divided into vertical spring torque testing machine and horizontal spring torque testing machine. They shall be kept intact at ordinary times and used regularly until now

before starting the pulverizing system and equipment maintenance, carefully check whether the inner wall of the equipment is smooth and whether there is a dead corner of powder accumulation. In case of spontaneous combustion of residual pulverized coal in the bunker during the clearing process, the cleaning personnel shall immediately withdraw to the outside of the bunker, close the pulverized coal bunker tightly, and extinguish the fire with steam, nitrogen or carbon dioxide extinguishers. Explosion proof portable lights must be used in the pulverized coal bunker during clearing. When removing the accumulated powder, the staff shall wear work clothes that do not generate static electricity, use copper or aluminum tools, do not bring kindling, and do not use compressed air or oxygen for purging. When cleaning the accumulated pulverized coal in the coal mill, it is forbidden to open the manhole door for cleaning when the pulverized coal temperature has not dropped below the combustible point

hot work is strictly prohibited on the pulverizing system equipment in operation. If hot work is carried out in the deactivated pulverizing system, the hot work ticket system shall be implemented. The accumulated powder at this equipment must be removed and reliable isolation measures must be taken. In places with high pulverized coal concentration, hot work permit procedures can be handled and hot work can be carried out only after the dust concentration is determined to be qualified

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