The coal in Helan Mountain has been burning. What can I do to put it out?

It is a natural phenomenon that the self-oxidation heat of coal exposed to air reaches the ignition temperature. Coal spontaneous combustion must meet three conditions: combustible crushed coal, sufficient oxygen and an environment suitable for heat storage and temperature rise. The naturalness of coal is often expressed by natural tendency. Spontaneous combustion tendency is a natural property of coal, which depends on the oxidation ability of coal at room temperature and is the basic condition of coal spontaneous combustion. Coal spontaneous combustion can be divided into three stages: incubation period, self-heating period and combustion period. Incubation period: This stage is the initial stage of contact between coal and air. The interaction with oxygen is weak, there is no obvious warming phenomenon in itself, and there is no sign of warming in the surrounding environment. Usually, this stage lasts for a long time and varies with different coal types.

Self-heating period: during this period, the temperature rises obviously and the rising speed gradually accelerates. With the automatic acceleration of coal's oxygen absorption capacity, heat is further accumulated. The characteristic value of the obvious temperature rise of coal is generally considered to be between 60 and 80 degrees, but it varies with different coal types. During this period, the oxidation speed of coal is rapidly accelerated, the temperature is obviously increased, the temperature is above the critical temperature, and the temperature of air and surrounding environment is gradually increased. There will be obvious fireworks and special fire smell. Coalfield fire is a major disaster in the coal field to be developed, which will not only waste a lot of coal resources, but also raise the ground temperature near the fire source, release a lot of toxic and harmful gases into the atmosphere, pollute the environment, cause the ground to crack and collapse, and cause the death of surface vegetation, thus affecting the normal development of coal fields and the normal life of people. China's coal fire area has reached 700 square kilometers, of which the active fire area is nearly 20 square kilometers, burning tens of millions of tons of coal every year, which is the most serious coal fire area in the world. Especially in Xinjiang, China, coalfield fires have a long history. According to research, most of the extinguished ancient coalfield fires occurred in the late renewal period of 800,000 years ago. There were records of coalfield fires in China in the Tang Dynasty.

Direct fire extinguishing, indirect fire extinguishing and comprehensive fire extinguishing. In Xinjiang, China, comprehensive fire-fighting measures, such as water injection, grouting, fire source digging and sand covering, have been taken to extinguish the fire areas such as Dananhu, Aiweiergou, Tiechanggou, Qitaipei Mountain Fire and Fukang Baiyang River. The fire area of Rujigou coalfield in Ningxia is controlled by blocking the fire head to prevent the fire from spreading, blocking the ground subsidence and cracks, filling and covering the aging or reducing the fire area. A large amount of water and sediment should be stirred into slurry and poured into the crater, which should be able to put it out. Reason one. Water can put out fires; Reason two. Water is impermanent, as long as it is enough, it can enter all pores; Reason three. Mud in the water can isolate the air, suffocate the fire and fill the space, so that the fire will not rekindle. It's actually quite simple. Ask the military to intervene. Use ground penetrating missiles to add fuel and air explosives. Firstly, the depth and luminosity of the burning coal seam are tested, and the drilling depth of a special ground penetrating missile with the same depth is made, and the fuel air explosive below is hit, so that the fire is gradually reduced, and oxygen is pumped out where the fuel air explosive hits. When the fire is small, it will be easy to deal with.

Turn plants into coal, then drill several wells in the coal field to pump methane up, and then you will see if the coal seam will extinguish itself. After all, the coal seam is low in oxygen, and it burns because there is a steady stream of methane. There must be natural gas under the supplementary coalfield. Regarding the spontaneous combustion of Helanshan coal seam, is it possible to build a dam around the fire point, and then extend a large-diameter water diversion pipeline from the water-rich place to the cofferdam to extinguish the fire through flood? Is this method desirable? What cannot be extinguished can be used as geothermal development and utilization. With such ready-made energy, there is no need for electricity to boil water. This difficulty of utilization is still to be partially utilized. We can develop hot rocks thousands of meters underground and combustible ice thousands of meters underwater. There should be no problem with this coal fire on the surface, depending on the intention. The deepest is about 500 meters and the shallowest is 780 meters. The surface temperature is not very high. Smoke and gas can be seen in the local average rupture time. As we all know, several fire fighting methods were tried in 1950s and 1960s, but they were all ineffective. Cement mortar spraying method was tried more than ten years ago, and the effect was not great.