活性焦烟气净化技术是一种多污染物一体化脱除技术，活性焦再生是其中的关键步骤之一，采用热力解析能量消耗较大，而在燃煤电站采用较低品位的热源——烟气以及中低压蒸汽，是一种值得探讨的方法。以某660 MW超超临界机组为例，提出从二级省煤器前抽烟气并在低负荷时辅以4号抽汽的蒸汽（方案1）以及从后烟道低温过热器前抽烟气（方案2）两种方案分别作为活性焦解析热源，计算结果表明：100%负荷时两种方案对省煤器出口水温无影响，排烟温度分别下降3.7和2 ℃，供电标准煤耗分别增加3.34和3.64 g/(kW·h)；50%负荷时省煤器出口水温分别下降6.2和3.4 ℃，〖JP2〗排烟温度下降2.1和1.6 ℃，供电标准煤耗分别增加10.32和8.13 g/(kW·h)。〖JP〗可根据机组特点，高负荷运行时长占比大的机组可选择方案1、低负荷运行时长占比大的机组可选择方案2作为解析热源。

Flue gas purification technology using active coke is a multipollutant integrated removal technology,and regeneration of active coke is one of the key technologies.Thermal desorption consumes a lot of energy to regenerate active coke,but it is worth discussing to adopt a lower grade heat source in coalfired power plants,namely,flue gas and medium or low pressure steam.With a 660 MW ultrasupercritical unit as an example,two schemes were proposed to calculate as the desorption heat source of active coke: scheme one was smoke extraction from the front of the second economizer with steam extraction from the No.4 when the load was lower,and scheme two was smoke extraction from the front of the lowtemperature superheater.The results show that the two schemes has no effect on the water temperature at the outlet of the economizer at 100 % load.The exhaust gas temperature decreases by 3.7 and 2 ℃,respectively,and the standard coal consumption of power supply increases by 3.34 and 3.64 g/(kW·h),respectively.when it is at 50% load,the water temperature at the outlet of the economizer decreases by 6.2 and 3.4 ℃,the exhaust gas temperature decreases by 2.1 and 1.6 ℃,and the standard coal consumption of power supply increases by 10.32 and 8.13 g/(kW·h),respectively.According to the characteristics of the unit,the unit with large proportion of long running time under high load can choose scheme one as the desorption heat source,while the one with long running time under low load can choose scheme two.

TK222

国家重点研发计划（2017YFC0210200）