电厂烟气注入采空区封存的可行性

为了考察将电厂烟气注入采空区实现防火与气体封存的可行性,采用自制的煤大样量吸附装置测定了常温、常压条件下塔山烟煤对各种烟气成分的饱和吸附量,并对烟煤在空气和烟气氛围下对氧气的吸附行为进行了研究. 结果表明:将电厂烟气注入井下采空区,每t煤可封存约1.20 m3的CO₂,烟气中SO₂和NO₂可全部被烟煤封存；在物理吸附阶段,烟煤对CO₂的吸附量分别为对N₂吸附量的13倍,对O₂吸附量的41倍；在常温、常压条件下,烟煤对N₂和CO₂的吸附为物理吸附,12 h已基本达到饱和状态,但烟煤对O₂的吸附随着时间的增加逐渐由物理吸附转变为化学吸附,因此在较长时间内未能达到平衡状态. 通过不同气体氛围下烟煤吸附氧气量的数据分析发现,将电厂烟气注入到采空区,因烟煤对氧气的吸附量降低了29%,可有效抑制其自燃反应的进行. 研究显示,电厂烟气注入采空区可实现节能减排和灾害治理的统一. 

Feasibility Analysis on Seal of Power Plant Smoke Injected into the Goaf

Abstract: In order to investigate the feasibility of injecting flue gas in gob area for its seal and application to prevent spontaneous combustion of coal, artificially designed experimental device is used for testing the adsorption quantity of bituminous coal to flue gases at normal temperature and pressure. The adsorption behavior of coal to O₂ in air and flue gas atmosphere is studied experimentally. The results show that around 1.20 m³ CO₂ and all the SO₂ and NO₂ in flue gas can be sealed in one ton of coal. In the stage of physical adsorption, the adsorption amount of CO₂ was about 13 times of that for N₂ and 41 times for O₂, respectively. At the normal temperature and pressure, the absorption of coal to N₂ and CO₂ was a physical one, spending 12 h to reach the state of saturation. Along with time increasing the absorption between coal and O₂ varies from physical one to chemical one, resulting in it fails to reach the state of equilibrium even in a long time. Through analyzing the difference of adsorption amount of coal to oxygen under various gas atmospheres, it is found that with the injection of flue gas into the gob the adsorption amount will reduce by 29%. This technique effectively inhibits the spontaneous combustion of coal, not only conserving the energy but also preventing the hazard.