Extinguishing method for coal gangue dump system

Abstract

The invention provides an extinguishing method for a coal gangue dump system and belongs to the field of management and ecological environment recovery of mine wastes. The invention provides the extinguishing method which combines excavation extinguishing, ditching and fluid injection extinguishing, loess covering, massif stabilization, flexible water drainage ditch, flexible slope protection and plant recovery technologies to form systematic extinguishment and fire prevention. The extinguishing method is carried out according to the following steps: observing a fire behavior and distributing temperature measuring points to determine a kindling point; determining grain diameter distribution and the porosity; carrying out excavation extinguishing treatment on a combustion hole and carrying out massif slope cutting reforming; on the basis of the massif slope cutting reforming, carrying out fluid injection extinguishing on rough gangues exposed from the lower part of a coal gangue dump and a fire region exposed out in the massif slope cutting reforming process; carrying out ditching and fluid injection fire prevention on positions with spontaneous combustion phenomena on the inner side of a riding track and the lower part in a massif to carry out annular slope toe closed extinguishing on a management region; and arranging a water drainage system. The extinguishing method for the coal gangue dump system is mainly applied to the extinguishing aspect of the coal gangue dump.

Description

technical field [0001] The invention discloses a method for extinguishing a coal gangue system fire, which belongs to the field of mine waste management and ecological environment restoration. Background technique [0002] Coal gangue is a black-gray rock associated with coal seams. As a solid waste produced in the process of coal mining and processing, with the rapid development of my country's national economy, the demand for energy continues to increase, coal production gradually increases, and the discharge of coal gangue also increases. constant increase. At present, most of the gangue discharged from coal mines at home and abroad are discarded in ravines and plains, where the stacking time is long and the utilization rate is extremely low, occupying valuable cultivated land resources. Moreover, spontaneous combustion is common. According to literature estimates (Wang En, Research on Deep Hole Grouting Fire Extinguishment of Coal Gangue Dumps, 2011, Coal Mine Environmen...

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Problems solved by technology

Among them, the covering method is to avoid the contact between coal gangue and air by covering the surface of coal gangue with inert substances, so as to achieve the purpose of fire prevention and fire extinguishing. It is also a method widely used at home and abroad. European developed countries mainly use layered stacking compaction and layered covering For the method of inert material, the method of loess covering and rolling is mainly used in China, but many local fires have repeated local fires or even large-scale re-ignition, and the covered loess has even burned to brick red; the excavation method is first based on experience or temperature measurement results Find the fire source, then dig out the burning and heating gangue, cool it with water or naturally, and then fill it back to the original place. This method is simple to implement and has a high success rate, but it is only suitable for coal gangue that has just spontaneously ignited. Gangue hills with high burning intensity are not suitable, and are suitable as an auxiliary measure for other fire extinguishing methods; the grouting method is a technology widely used at home and abroad at present, and has achieved good results in practice, but the disadvantage is that it can be used in fire areas on the one hand. Drilling is more difficult. On the other hand, due to the extremely fine particles of gangue after combustion and poor permeability, it is difficult to achieve the expected effect of deep hole grouting; the cost of controlled combustion is high, and it is rarely used in practical applications.

[0006] These patents basically use a single fire extinguishing method. In reality, gangue hill fires are somewhat complicated. It is difficult to completely extinguish the fire and prevent re-ignition simply by using loess covering, slope cutting, deep grouting or any combination of the two. In addition, when deep grouting, because the gangue particles with high temperature are very fine, an impermeable layer is often formed, and it is difficult for the slurry to reach the ignition point, which fails to achieve the purpose of fire extinguishing, and there is still oxygen in the grouting process. cause an explosion

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