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针对煤矿抽采瓦斯混兑稀释通入热逆流氧化装置氧化处理的需要,采用漩涡强制混合的思路,设计了差速式抽采瓦斯稀释混合器。采用数值模拟方法研究了混合器后管道内CH4的浓度分布,并针对煤矿现场运行参数波动的实际情况,研究了内外管道速度比、入口CH4浓度等运行参数以及抽采瓦斯与空气流量调节系统对混合效果的影响。研究结果表明,混合器后CH4浓度从管路中心到壁面逐渐降低,CH4分布的均匀性逐渐提高;内外管道速度比越小,混合气体浓度分布就越均匀;抽采瓦斯浓度变大导致不均匀性系数增大,而采用抽采瓦斯及空气流量自动调节系统时抽采瓦斯浓度越高则不均匀性系数越小,采用抽采瓦斯及空气流量自动调节系统可确保差速式抽采瓦斯稀释混合器有效促进CH4均匀分布。
In view of the need of coal gas extraction and gas dilution into hot countercurrent oxidation device for coal mine gas drainage, a differential pumping gas dilution mixer was designed by using whirlpool forced mixing. The concentration distribution of CH4 in the pipe after the mixer was studied by the numerical simulation method. According to the actual situation of the coal mine site operating parameters fluctuation, the operating parameters such as the internal / external pipeline velocity ratio, inlet CH4 concentration, and the gas and air flow control system Effect of mixing effect. The results show that the CH4 concentration gradually decreases from the center of the pipeline to the wall and the uniformity of CH4 distribution gradually increases after the mixer. The smaller the velocity ratio between the inner and outer pipes, the more uniform the distribution of the mixed gas. The sex coefficient increases, while the extraction of gas and air flow automatically adjusts the system when pumping gas concentration is higher, the smaller the coefficient of heterogeneity, the use of gas extraction and air flow automatic adjustment system to ensure differential pumping gas dilution The mixer effectively promotes the uniform distribution of CH4.