CAJ | 학술논문

为提高褐煤干燥系统能源利用率及高效回收干燥尾气中的水分和热能,提出一种基于烟气再循环技术的褐煤干燥系统,利用Matlab对系统进行建模,并对系统的节能性、安全性及水回收效益进行了仿真计算和分析. 结果表明,该系统属于低温干燥,以循环烟气代替空气,干燥介质含氧量与含湿量均大幅下降,工艺更加安全可靠,有效提高了干燥过程的传热与传质强度,提高系统热效率. 与传统烟气-空气混合煤干燥系统相比,烟气混合干燥系统煤耗为39. 60 kg/t,降低7. 62%;热效率和火用效率分别提高4. 31%和3. 01%;回收水流量为1. 73 t/h,未产生新的污染物,更加节能环保;干燥介质含湿量降低37. 21 g/kg,干燥强度更加剧烈,有利于减少干燥耗时;氧气体积分数降低7. 84%,解决了褐煤干燥系统的安全问题.
위제고갈매간조계통능원이용솔급고효회수간조미기중적수분화열능,제출일충기우연기재순배기술적갈매간조계통,이용Matlab대계통진행건모,병대계통적절능성、안전성급수회수효익진행료방진계산화분석. 결과표명,해계통속우저온간조,이순배연기대체공기,간조개질함양량여함습량균대폭하강,공예경가안전가고,유효제고료간조과정적전열여전질강도,제고계통열효솔. 여전통연기-공기혼합매간조계통상비,연기혼합간조계통매모위39. 60 kg/t,강저7. 62%;열효솔화화용효솔분별제고4. 31%화3. 01%;회수수류량위1. 73 t/h,미산생신적오염물,경가절능배보;간조개질함습량강저37. 21 g/kg,간조강도경가극렬,유리우감소간조모시;양기체적분수강저7. 84%,해결료갈매간조계통적안전문제.
To improve efficiency of lignite drying system and recovery of dry exhaust moisture and heat,a lignite drying system based on flue gas recirculation technology was proposed,and the mathematical model was established by MATLAB. The energy saving,security and water recovery efficiency of the system were simulated and analyzed. The results showed that the system was low temperature drying,which used flue gas as drying medium,the oxygen content and moisture of drying medium reduced significantly,the process was more reliable and effective. The heat transfer and mass transfer intensity and thermal efficiency of the system were improved. Compared to the traditional coal drying systems which used flue gas and air mixture as drying medium,the coal consumption of the system reduced to 39. 60 kg/t by 7. 62%,thermal efficiency and exergy efficiency was 4. 31% and 3. 01% respectively,recycling water flow was 1. 73 t/h and no new pol-lutants generated,the system was more environmentally friendly. The moisture content of the drying medium reduced by 37. 21 g/kg and the dry intense was enhanced,which shortened drying time. The oxygen concentration reduced by 7. 84%,which solved the security prob-lem of lignite drying system.