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在回热系统中布置低温烟气换热器(GCH)是降低排烟温度和回收热量的有效方式,将烟气换热器分别布置在1 000MW机组的电气除尘器前和脱硫吸收塔前,研究了烟气换热器投运后机组的性能.结果表明:两级式低温烟气换热器投运后,汽轮机热耗降低了0.56%,供电煤耗降低了1.59g/(kW·h),同时保证了烟气温度高于其酸露点温度,降低了相关设备的腐蚀风险;在保证脱硫效率的前提下,脱硫系统水耗降低了39.75t/h;电气除尘器的除尘效率有所提高,出口粉尘平均排放质量浓度降低到14.05mg/m3,能够满足新的国家排放标准要求;两级式低温烟气换热器有效地实现了机组节能、脱硫系统节水和电气除尘器除尘效率提高的目标,具有良好的应用前景.
The arrangement of low-temperature flue gas heat exchanger (GCH) in the regenerative system is an effective way to reduce the exhaust gas temperature and recover the heat. The flue gas heat exchangers are respectively arranged in front of the electric precipitator of the 1 000 MW unit and in front of the desulfurization absorption tower, The performance of the unit after the flue gas heat exchanger is put into operation is studied.The results show that after the two-stage low temperature flue gas heat exchanger is put into operation, the heat consumption of the steam turbine is reduced by 0.56% and the coal consumption of power supply is reduced by 1.59g / (kW · h) , While ensuring the flue gas temperature is higher than its acid dew point temperature, reducing the risk of corrosion of related equipment; under the premise of ensuring the desulfurization efficiency, desulfurization system water consumption decreased 39.75t / h; dust removal efficiency of the electric precipitator increased , The average emission mass concentration of export dust reduced to 14.05mg / m3, to meet the new national emission standards; two-stage low-temperature flue gas heat exchanger to effectively achieve the unit energy-saving, desulfurization system, water saving and ESP dust removal efficiency The goal, has good application prospects.