(1) Technical methods for external fire prevention and external fires Fires are caused by external fire sources. There are two aspects to the prevention of fires due to fires: One is to prevent fires; the other is to prevent the occurrence of fire accidents that have occurred to minimize fire damage. 1. Measures to prevent external fires (1) Prevent the generation and presence of uncontrolled high temperature heat sources. (2) Try not to use or use less combustible materials, and have to maintain a certain safe distance from potential heat sources when using them. (3) Prevent the occurrence of electromechanical fires. (4) Prevent friction ignition: 1 Prevent the tape from rubbing and catching fire. The belt conveyor should have a comprehensive protection system such as anti-slip, anti-deviation, overload protection and bearing temperature rise control; 2 Prevent friction from igniting gas. (5) Prevent high temperature heat sources and sparks from interacting with combustibles. (II) Technical Ways for Fire Prevention and Control From the perspective of preventing spontaneous combustion of mines, the general requirements for exploiting mining technology are: 1 to improve the recovery rate and reduce the loss of coal , that is, to reduce or eliminate the material basis of spontaneous combustion. 2 Limit or prevent the inflow and penetration of air into the loose coal body, eliminating the oxygen supply conditions of spontaneous combustion. 3 The leakage of air to the combustible material is limited in quantity to the amount of non-combustible air, and is limited in time to the period of spontaneous combustion. In order to meet the above requirements, the following technical measures should normally be taken: 1. Reasonable determination of the way of development 1) Use rocky roadways as much as possible. 2) Vertical overlapping arrangement of layered roadway 3) Separate mining and arranging section roadway. 4) Promote coal pillarless mining technology 2. Choose a reasonable coal mining method 3, ventilation measures to prevent spontaneous combustion 1) Choose a reasonable ventilation system 2) Increase resistance to reduce air leakage and prevent fire extinguishing 3) Equalize pressure to reduce air leakage and prevent fire 4, the medium method to prevent self-ignition and ignite 1) Grouting and fire prevention 2) Gel fire prevention 3) Anti-fire extinguishing agent 4) Inert gas fire prevention 5) Foam fire prevention (3) Closure of fire zone 1. Principle of closed fire zone The principle of closing fire zone is: "Small, small, small, fast" four words. 2. Method of closing the fire zone 1) Lock the wind to close the fire zone. From the fire zone to the wind side, a firewall is built to close the fire zone, and the fire zone is closed without ventilation. This method is suitable for gas depletion in the fire zone, oxygen concentration below the gas explosion and deflagration limits. 2) Ventilation closed fire zone. Under the condition of keeping the fire area ventilated, construct a firewall on both sides of the inlet and return air to close the fire area. The oxygen concentration applicable to the air in the fire zone is higher than the detonation limit. 3) Inject the inertia to close the fire zone. Injecting a large amount of inert gas while closing the fire zone, so that the time that the oxygen concentration in the fire zone reaches the detonation limit is less than the time elapsed after the explosion gas accumulates to the lower explosion limit. Chair Base,Dining Table Base,Chair Base Parts,Base Chair Office Ningbo Beilun Huasheng Mould Factory , https://www.huashengmoulds.com