电厂烟气注入采空区封存的可行性

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

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CO_2,烟气中SO_2和NO_2可全部被烟煤封存;在物理吸附阶段,烟煤对CO_2的吸附量分别为对N2吸附量的13倍,对O_2吸附量的41倍;在常温、常压条件下,烟煤对N2和CO_2的吸附为物理吸附,12 h已基本达到饱和状态,但烟煤对O_2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.

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 m3CO2 and all the SO2 and NO2in 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 CO2was 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.