A wind-blown explosion occurred in the 208 air compressor. 1 Analysis of the cause of the air compressor explosion accident of the air compressor 1.1 The root cause of the airbag explosion caused by the airbag defect is that the wind pressure inside the windbag exceeds the strength of the windbag. The rated pressure of the air compressor wind bag of the mine is like a local defect in the wind. If the wall thickness is uneven, the pores and cracks are poorly soiled, and the wind bag strength has not reached the standard requirements. Although the wind bag is still working at rated pressure, an explosion can still occur. 1.2 The rated pressure of the gas in the air bag overpressure air bag is determined by the pressure regulator and the safety valve to determine the failure of components such as pipes. The gas pressure in the windshield of the safety valve is rising rapidly. When the strength limit of the wind pack is exceeded. An explosion will occur. 1.3 Accumulate the cylinder exhaust pipe of the air compressor. In the valve air bag and separator, the lubricating oil accompanying the air flow. Oxidation by hot air to form carbides. This increase in carbides becomes carbon deposits. It is flammable. It is made up of solid oxygen. The hydrogen-trapping compound and the impurity metal powder slag are composed of dust. The formation of carbon deposits is not related to the regular cleaning of the oil. It is also related to excessive oil filtration and high temperature. The carbon deposit is due to mechanical shock. The impact of hard particles during exercise and sparks generated by electrostatic discharge, or the ambient temperature and the air compressor exhaust temperature are too high to reach the auto-ignition temperature. It will burn on fire. The oil in the carbon deposit is rapidly vaporized, and when the flammable hydrocarbon is generated as the main body, the 1.4-channel vibrating reciprocating air compressor has intermittent, so that the pressure and velocity of the airflow in the pipeline are pulsating and periodically changing. . This pulsating air flow passes through the pipe bend valve or the reducer. Will generate exciting power. The pipe vibration is caused, and the unevenness of the pulsation pressure is larger. The vibration is also greater; the higher the pressure at which the compressor is delivered. The larger the diameter of the pipe, the greater the excitation force; the frequency of the pipe vibration caused by the pulsating air flow, if it is the same or similar to the natural frequency of the pipe structure system, will cause the pipe mechanism to resonate, even if the excitation force is not large, the vibration of the pipe is also It will be particularly strong. The result of pipe vibration is to add fatigue loading between the pipe and the pipe or between the pipe and the windshield valve. There will be loosening and cracking, and light leakage will occur, and explosion will occur. 2 Air compressor wind package explosion accident prevention measures 2.1 Wind package defect prevention measures Wind package is a pressure vessel. The large modification of the wind bag must be in accordance with the management method of the pressure vessel, and only the unit holding the license can carry out, such as the certificate of non-destructive testing. The wind bag is inspected according to quality standards and cleaned regularly. Not suitable for the standard. The newly installed or repaired wind bag must carry out relevant tests. 2.2 Wind bag overpressure precautions set up the pressure protection device inside the wind bag. Once the overpressure is automatically cut off, the pressure regulator safety valve must be properly adjusted to ensure flexibility. Good IU. The operation and maintenance personnel must operate and maintain the air compressor according to the relevant provisions of the safety knowledge regulations. 2.3 Precautions for the accumulation of lubricants should be rationally selected. Make it flash point. Viscosity. Antioxidant capacity and thermal oxidation stability are in compliance with regulations. The amount of lubricant should be appropriate. Do not overdose or insufficient, and follow the equipment technical documentation. Control the exhaust temperature. 0 Strengthen the transformation and management of the air compressor cooling system. Reasonably select the cooling water quality to remove the scale of the cooler tube wall and the cylinder cooling water chamber wall in time. Control the cooling water inlet and outlet temperature difference is not more than 10 to reduce the pipeline. The temperature of the gas in the wind bag is strengthened to check and modify the quality of the parts to ensure that the valve does not leak and prevent the gas from being compressed. If equipped with a post-cooler; set up a protection device for the gas temperature inside the exhaust gas temperature package, but the water temperature can automatically cut off the power when over temperature. Strengthen the suction filtration to prevent the inhaled gas from dusting and containing hard particles; strengthen the cleaning of the wind bag to prevent the carbon layer from being too thick; improve the sealing effect of the stuffing box, prevent the oil in the crankcase from leaking into the cylinder and entering the wind pack. 2.4 Precautions for ramp vibration design When installing or installing a compressed air line. The elbow valve and the reducer should be minimized, or the radius of curvature of the bend should be made larger to reduce the exciting force. A pipe that has been vibrating. A buffer is placed very close to the air compressor. Wind packs are also a kind of buffer. If the volume is not large enough, Bay 1 should be appropriately increased. To reduce the unevenness of the pulsating pressure. Deep hole coal seam water injection drilling and collapse treatment Wu Zhiqiang Xinwenye Group, the coal mining process Shandong Laiwu 2722 Ezhuang Coal Mine mining area is called the average coal thickness of the coal seam 2 coal mining face to implement deep hole coal seam water injection. But with the depth of mining, plus. Coal seam pressure is increasing. When playing deep holes. Collapse often occurs. The phenomenon of sputum, taking 2406 Dongding face elevation, level. Working face inclined length 170 coal seam water injection drilling set 130 melon adopts type 3 liquid helium machine. 14 coffee; 1. Pipe drill pipe. 85 fishtail drill bit. The pulverized coal particles in the borehole are discharged by water, and after ten days of drilling. A total of 12 eyes were drilled. The deepest hole 13!1 is as deep as 9! It is far from the depth specified in the operating procedures. Unable to perform deep hole coal seam water injection 1 reason analysis like drilling from the beginning of drilling hole depth 34,1. More normal. After 341, the amount of water returned to the borehole is reduced, and the phenomenon of collapse is caused. The load on the rig is increased. After deceleration and punching, drilling continues. When drilling less than 10, the rig will have increased load and difficulty in drilling. In the case of measures such as stopping drilling and reversing the reaming, 45!1 drilling less than 9, deep hole in the coal seam The main difficulty is that there are many soft cracks in the coal seam. Look at the lanes or down lanes on the work surface. The two sides of the roadway are affected by the stress concentration zone that has been formed after the excavation, and it is prone to collapse. The east side of 2406 is deep, and there are many cracks in the coal seam pressure. When the deep hole is drilled into 34, it enters the concentrated area on both sides of the roadway. Under the influence of pressure, when the eye is hit, the kaka sound is sometimes emitted in the coal seam, and the collapse phenomenon occurs. Block the normal drilling back into the water. In addition, due to the fracture of the coal seam, the drilling formation is poor. During the drilling process. The large pieces of coal that have collapsed in the hole will not move back, and the inner wall of the borehole after the collapse of the hole will be uneven. The difficulty of discharging coal particles is added, so that the coal particles cannot be flushed out in time. When there is more and more siltation. Will get stuck in the drill pipe, 26 reaming a 65 continent 1 drilling and forming a fine pulverized coal powder; the boundary is easy to block the cold drilling gas drill, the name of the hole anvil, the 屯 åŸ åŸ åŸ åŸ åŸ å‡å°‘ å‡å°‘ å‡å°‘ å‡å°‘ å‡å°‘Due to the large drilling area. Under the influence of pressure, the collapse phenomenon caused by the coal pulverized coal sometimes appears to be discharged from the coal particles in the borehole. Causes the water pressure in the hole to increase. The inner wall of the drill hole is damaged. In the case of a larger area of ​​collapse, a drill pipe combined with a water jet and a spiral is designed to weld the thread on the drill pipe of the stomach. When drilling normally. The front end bit reduces the amount of collapse. The rear end auger drill rod discharges the coal powder in time, selects the location where the coal seam is small, and arranges the drilling angle according to the actual inclination angle of the coal seam. The orifice is arranged slightly above the middle of the coal seam. In order to avoid the deep hole drill pipe being long, the drill pipe speed is slowed down when the drill pipe passes through the floor in the stress concentration zone on the side of the roadway due to its own weight. Maintain normal drilling backwater status. After passing through the stress concentration zone. Restore normal drilling speed. When drilling from the upper lane down. When drilling more than 5,1, the drill pipe will speed up the drilling due to its own weight. The rig speed should be controlled. Avoid causing stuck drills due to the discharge of pulverized coal. 3 The effect obtained 2 The measures taken 1 are to solve the collapse. The Ezhuang Mine has developed a 65-long tapered drill bit. The long tapered drill bit is the end 526, the rear end 65, the drill bit length is 200. If the long cone drill bit is drilled directly to the 851 compared with the fishtail drill bit, the long cone drill bit is characterized by small area drilling first. And then by taking the above measures, in the east of 2406 successfully hit the pupil of 102 133 15. After water injection. The increase of 3.12 in the coal seam of the working face effectively reduces the amount of coal dust generated during coal mining. Safe production is guaranteed. Department of Sub-Department; or, add support for a pipe; or use a heavy object to press somewhere in the pipe, if the vibration is found to be significantly reduced or eliminated. It means that the original pipe vibration is the pipe. In order to prevent the residual pulsation of each wind bag from being sometimes strengthened in the collector due to the same phase of the crank, the volume of the collector can be enlarged. 3 Concluding remarks 0 sen, gas super 1 æž³ carbon 5. Burning and tube caused by vibration. Take appropriate measures to avoid the occurrence of such accidents. Dongfang Mining Institute, major in mechanical design and manufacturing, is currently the mechanical and electrical director of Chaoyang Coal Mine.
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September 23, 2021