Coal mine underground natural ventilation system and method

Abstract

The invention relates to a natural ventilation system for a coal mine underground and a natural ventilation method for the coal mine underground. The natural ventilation system comprises a main air return roadway, a main return air duct, an exhausting chimney, and a return air duct, wherein the return air duct is synchronously extended into a mining area along mining and tunneling actions, gas generated in a tunneling process is extracted and conveyed into the main coal mine air return roadway or the main return air duct through the suction inlet of the return air duct before being diffused, and finally discharged through the exhausting chimney; a return air connection roadway or a return air connection pipeline is arranged on the innermost end of the mining area and the return air pipeline in a first mining area is connected with other subsequent mining areas, or the first mining area is connected with the other subsequent mining areas. According to the system and the method, the problem of gas accumulation in the mining area and the mining empty area is completely solved, so that gas in each place of the mining areas can enter into the main return air roadway or the main return air duct in the first time and cannot be retained in the production area and accumulated in the mining empty area, gas explosion is completely eradicated, the energy is saved and the hole is in a constant temperature status such as warmer winter and cooler summer.

Description

technical field [0001] The invention relates to coal mine ventilation technology, in particular to a natural ventilation system and method for goafs in underground coal mines. Background technique [0002] In addition to commonality, coal mine production and other mine production also have its particularity, that is, the existence of gas, especially the continuous release of gas in the goaf that is being mined. If the gas cannot be discharged in time, a gas explosion will be formed. Repository, along with the mining area. [0003] The current ventilation system of the coal mine is the air intake from the main roadway, and the large-horsepower induced draft fan at the exit of the main return air roadway discharges the sewage air to the outside. The fan machine installed at the mouth of the mining area is pressed into the mining area through the air duct, so that the dirty gas slowly enters the suction port of the main return air roadway in the mining area roadway, the fresh ...

AI Technical Summary

Problems solved by technology

[0003] The current ventilation system of the coal mine is the air intake from the main roadway, and the large-horsepower induced draft fan at the exit of the main return air roadway discharges the sewage air to the outside. The fan machine installed at the mouth of the mining area is pressed into the mining area through the air duct, so that the dirty gas slowly enters the suction port of the main return air roadway in the mining area roadway, the fresh air is in the pipe, and people are in the roadway of the dirty gas , this kind of ventilation method has no safety hazard in the main roadway and the main return air roadway, but the waste of energy consumption is too large, there are too many useless labors, and it basically has no effect on the gas in the mining area and goaf, but there are the following problems : 1. The fresh air introduced into the main roadway by the induced draft fan is pressed into each mining area under the action of the concentrating fan machine, and the dirty gas (gas) generated in each mining area relies on the compressed air flow to generate turbid air slowly throughout the process Move into the air suction port at the entrance of each mining area, because the airflow pressed in by the concentrator is too large, and the dirty gas in the goaf is diffused in the dead space of the single-headed hole, the fresh airflow pressed into each goaf makes The dirty gas in the mining area has extremely poor fluidity and stays in the cave for too long. Therefore, this ventilation method cannot make the dirty gas enter the return air system at the first time it is generated. The gas in the tunnel and the goaf exploded at the same time, and the long tunnel workers were unable to leave the scene within a few seconds, causing serious loss of life and property; 2. The concentrating fan at the entrance of the mining area must increase the wind power to squeeze out the dirty gas In the air return roadway, the wind force of the concentrating fan machine is too high to cause the dust in the tunnel to rise and cause a coal dust explosion. In addition, practice has proved that the wind force of the concentrating fan machine is too strong, which is not conducive to the gas discharge in the goaf; 3. The longer the roadway in the goaf, the greater the risk. With the acceleration of coal mining, the space in the goaf is getting bigger and bigger. The time of dirty gas flowing in the roadway is too slow and too long, which increases the risk of explosion; 4. Due to Dirty gas cannot be discharged at the first time when it is produced, so the workers in the entire mining area have been working in a seriously polluted environment for many years, which seriously endangers human health; 5. The induced draft fan has a very large power to meet the ventilation requirements , In the case of no one working on holidays, the induced draft fan and the concentrating fan machine must also maintain the working state to keep no gas accumulation in the mining area. Therefore, the waste of equipment and energy is huge, and the long-term uninterrupted operation mode causes unsafe hidden dangers 6. The induced draft fan introduces the airflow outside the mining area into the mining area. Due to the huge air volume, the temperature in the roadway is too high in summer, and the temperature in winter is too low to freeze, seriously endangering the health of workers and affecting production efficiency; 7. Fan It will cause more noise pollution in the cave and seriously damage human health; 8. The more electrical equipment there is, the more likely it is to generate open flames, and the greater the hidden danger

In summary, the current underground ventilation system in coal mines cannot completely solve the problem of gas accumulation in the goaf, and there are potential safety hazards and huge waste of equipment and energy

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