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Currently, the explosion poison gas sites locally semi-enclosed space ventilation are still some problems, did not pay close attention, there are security risks. In order to make explosive poison gas sites locally semi-enclosed space ventilation detoxification better ventilation, ventilation method is more economical, more improvement in the operating environment, the paper carried an overhead absorption than gas - gas jet ventilation key technology. In this paper, the main contents of the following aspects: Overhead absorption than air gas swirling jet suction ventilation mechanisms, including rotating jet basic theory, overhead absorption than air gas jet ventilation works, basic performance equations and factors affecting gas - gas jet ventilation parameter range of theories to determine; Overhead absorption than air gas jet device key technical parameters optimization, including different nozzle diameter, different pipe lengths and different pressure gas flow rate on the suction air flow and other parameters such as; developed ventilation, high efficiency, suction capacity, low noise, high radiation absorption than air gas jet device and mechanized mining face in high ventilation drill field study carried out industrial trials. In this paper, methods are mainly theoretical analysis, experimental research and field studies of industrial test. Theoretical analysis, the use of the limited space jet theory, computational fluid dynamics, ventilation and dust, and mathematical statistics, theoretical analysis Overhead suction gas than the gas jet ventilation mechanism, experimental study to determine the relevant parameters and their ranges; laboratory research, carried out with different absorption wind pipe production, the establishment of experimental systems, measurement and analysis of experimental data, and individual performance by orthogonal experiment method of combining and analyzing results Overhead suction gas gas jet device than the best matching parameters, while the gas gas jet noise problems arise conducted a preliminary experiment; industrial test research, chose Huaibei Mining Group Qinan Coal Mine 714 field was drilled face high overhead absorption than air gas jet, ventilation tests. The results showed that in the laboratory, the greater the flow of compressed air jet, the greater the intake air, suction aperture and an approximate linear relationship is proportional, the short pipes maximum amount of suction air, followed by long pipes, straight pipe suction volume worst. In the noise processing, the use of resonant cavities muffler noise reduction, noise sources in the low-frequency noise below 500Hz noise reduction effect is obvious; in industrial test, the pressure in the gas jet device after use, CH 4 from 0.35 % to 0.28%, a dilution rate of 20%, CO 2 dropped 0.11 percent from the 0.12% dilution rate of 8.3%, resulting in air volume is 70 ~ 80m 3 / min. In short, through laboratory research and industrial test study, can be well illustrated Overhead suction gas than the gas jet device is a better place explosive poison gas partial semi-enclosed space ventilation detoxification ventilation device, a device developed high efficiency , suction air volume, low noise, effectively improve the explosive poison gas sites locally semi-enclosed space ventilation ventilation detoxification effect, effectively improve the working environment.
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