保德煤矿奥陶纪灰岩水H2S形成机理及防治技术

Formation Mechanism and Prevention Technology of H2S in Ordovician Limestone Water in Baode Coal Mine

基于保德煤矿不同时期奥陶纪灰岩水水化学资料,采用离子组合比例分析、水文地球化学模拟等方法,通过PHREEQC软件计算饱和指数来分析奥灰水水化学成分沿流程的变化规律,定性分析奥陶纪灰岩水硫化氢气体形成机理及水岩相互作用对硫化氢气体形成的影响,并对硫化氢气体防控关键技术进行研究。结果表明:从径流区到滞流区,水化学类型由HCO3-Na(Na·Ca)→HCO3·Cl-Na·Ca(Ca·Mg)→Cl-Na(Na·Ca),SO4^2-离子含量呈总体增加趋势,最终由BSR作用形成H2S气体。CH4和C将硫酸盐矿物还原生成H2S同时生成CO2、HCO3-。根据现场实际情况设计防喷装置和孔口负压抽放装置。

This study is based on the water and chemistry data of Ordovician limestone in different periods of Baode Coal Mine,using ion combination ratio analysis,hydrogeo-chemical simulation,and other methods,the saturation index was calculated by PHREEQC software to analyze the variation of the chemical composition of the ash water in the process.The formation mechanism of the hydrogen sulfide gas in the Ordovician limestone water and the influence of water-rock interaction on the formation of hydrogen sulfide gas were analyzed qualitatively.And the key technologies of hydrogen sulfide gas prevention and control are researched.The results show that from the runoff zone to the stagnant zone,the water chemistry type is HCO3-Na(Na·Ca)→HCO3·Cl-Na·Ca(Ca·Mg)→Cl-Na(Na·Ca),the overall SO4^2- ion content has a increasing trend,and finally the H2S gas is formed by the action of BSR.CH4 and C reduce sulfate minerals to form H2S and simultaneously produce CO2 and HCO3^-.According to the actual situation of the site,the anti-spray device and the orifice negative pressure pumping device were designed.