Electromagnetic Excitation Of Gas Drainage Device

China is rich in coal resources, due to coal will produce large amounts of gas during the mining process, but gas is a flammable and explosive gas, the gas becomes imperative to drainage problems. However, even though China has abundant coal resources, but the coal seam has a large number of gas adsorption. If allowed to naturally resolve a very long time, it will affect the cost-effectiveness. Therefore, accelerating the release rate of gas can not only prevent gas explosions, but also increase economic efficiency. Studies have shown that, through in vitro plus an electromagnetic field of coal can reduce the adsorption capacity of coal for gas to increase the rate of gas emission. As the current generation of sinusoidal signals commonly used in LC circuit structure complicated and very inconvenient to debug them, and make the frequency continuously adjustable, it is difficult to achieve. Therefore, we use direct digital frequency synthesis technology, because there are digital devices consisting of a simple circuit structure and performance are more stable, frequency tuning is also very convenient.Sinusoidal electromagnetic fields in accordance with the impact of coal seam gas adsorption mechanism, plus the electromagnetic field can reduce the coal to gas adsorption capacity, increasing the release speed. According to this principle we have completed the design of this paper.This paper introduces the sine-wave magnetic fields affect coal seam gas adsorption mechanism and the theory of direct digital frequency synthesis, detailing sine wave generator based on FPGA design methods, and briefly described the FPGA and its design process, the final design of the hardware circuit a detailed description.Figure [27] table [1] reference [44]...