(1) Biogas effluent is closely related to geological changes, and general spurts occur in geological change zones. For example, the discharge of the mining face of Nantong Coal Mine occurs near the torsion axis or fault. (2) a top seam, a bottom layer with a slate cave, fractured limestone, where a large number of gas storage, the large gas discharge phenomenon may occur. (3) Biogas injection generally has obvious discharge ports or cracks. (4) The amount of biogas sprayed is large or small, ranging from a few cubic meters to hundreds of thousands of cubic meters. The duration of the spray is from a few minutes to several years, or even more than ten years. It is closely related to the amount of biogas accumulated and the source of biogas. (5) Precursors often appear before the biogas is ejected, such as the concentration of biogas becomes large, or suddenly and suddenly, and the buzzing sound when the amount of biogas is increased. Prevention and treatment measures for biogas effluent Measures to prevent and treat biogas effluent should be based on the amount of biogas effluent and the level of biogas pressure. Some mines are summarized as "exploration, drainage, introduction, and blockage." Exploring is to find out the geological structure and biogas; the drainage is to discharge or pump the biogas; the introduction is to lead the biogas to the total return air flow or the area 20 meters away from the working face; the plugging is to block the cracks, cracks, etc., to prevent the biogas Squirting. 1. Detecting geological structures Drill holes in front and on both sides of the heading face to find out if there are faults, fractures and caves, and to find out their location, size and biogas. 2. Discharge (or pump) biogas After the geological structure is proved, if the fault and the fracture range are not large, the volume of the cave is small, or when the amount of biogas accumulation is small, it can be naturally discharged. If the range is large and the amount of biogas accumulation is large, the duration of the spray may be long and it is not allowed to be naturally discharged. The drill hole should be connected to the pumping pipeline, and the plugging should be carried out after tight sealing. The Zhongliangshan Coal Mine used drilling holes to extract karst biogas. The absolute amount of biogas released after pumping dropped from 17.8 m3/min to 2.64 m3/min. () 3. Introduce biogas to the return airflow If the gas discharge small cracks range, the amount of accumulated gas is not available or the metal cover canvas cover covering the discharge methane cracks, and then to the cover duct or pipe connected to the biogas introduced into the return air flow, or 20 meters away from the working face In the lanes other than the roadway, the safety of the working surface is released and the tunneling is ensured. 4. Sealing the crack If the crack of the biogas is small and the amount of biogas accumulated is small, the crack can be blocked by yellow mud or other materials to prevent the biogas from being ejected to ensure the safety during excavation. In addition, there must be a separate ventilation system for the working surface where the biogas is sprayed, and the air supply should be appropriately increased to ensure that the biogas does not exceed the limit and does not affect other areas. Prevent the spraying of adjacent coal seams, in the early stage of mining coal seam working face, timely release, reduce the effect of concentrated pressure, and also drill the drilling of biogas in the vicinity of the open cut, increase the amount of biogas pumped, and reduce Biogas pressure in the coal seam. Medical Disposable Protective Suit The disposable medical protective gown in stock is factory directly sale with high quality and good price. Anti-Virus Protective Clothing,Medical Protective Suit,Disposable Protective Coverall,Safety Suit For Medical Use Shandong Shengquan New Materials Co., Ltd. , https://www.sqnewmaterials.com
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Causes, prevention and treatment measures of biogas injection
People constantly search for patterns from accidents that have been sprayed out of biogas several times and look for the causes. Generally considered: coal layer structure or formation of cracks in a large number of stored high pressure methane gas is discharged due to internal factors; in the mining process, since the penetration blasting or mechanical shock, or ground pressure, resulting in that the relief slot coal The passage that constitutes the biogas vent is its external factor. Squirting generally has the following rules: