
1. 山西大学电力与建筑学院
2. 珠海横琴能源发展有限公司
Published:2024
移动端阅览
[J]. Journal of electric power, 2024, (6): 529-540.
燃煤电站锅炉多采用湿法烟气脱硫技术,由此产生的饱和湿烟气若直接排放,将产生湿烟羽,其排烟热损失较大且烟气含湿量较大,会对环境产生影响。如何有效消除湿烟羽且回收烟气中的部分余热,降低脱硫耗水量并回收部分烟气水分,对于燃煤电站锅炉节能节水意义重大。采用烟气降温冷凝再热消白技术,具体为在减少脱硫耗水量的同时,降温冷凝回收烟气部分余热并与吸收式热泵相结合,作为烟气再热热源,可降低烟气消白能耗。计算结果表明,在脱硫塔前布置烟气冷却器,烟温由130℃降至90℃,可有效回收烟气显热且脱硫耗水量减少47.6%;在脱硫塔后布置喷淋冷却装置结合吸收式热泵可深度降低烟温至30℃,且回收冷凝水量占烟气中含水量的64.1%,在环境温度-10℃,相对湿度60%时,利用烟气余热可实现再热消白。所提方案对电厂在烟气消白过程中回收余热和减少用水量具有一定的指导意义。
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