深度调峰下多种供热改造耦合的容量配置优化研究

Optimization of Capacity Allocation for Coupling of Various Heat Supply Transformations under Deep Peak Regulation

为促进风能、太阳能等清洁能源的消纳,燃煤机组不断参与深度调峰,急需对热电联产机组进行灵活性改造。针对某660 MW纯凝机组,建立了中间抽汽供热仿真模型,在此基础上构建配置电锅炉供热(方案1)、吸收式热泵供热(方案2)以及电锅炉和吸收式热泵联合供热(方案3)3种方案。采用带精英策略的快速非支配排序的遗传(NSGA-Ⅱ)算法和优劣解距离(TOPSIS)法对方案3的容量配置进行优化,并深入分析不同方案下的热电解耦能力和热经济性。结果表明:相比于吸收式热泵供热,电锅炉供热能够极大提高机组的灵活性能力,但其热经济性较差;联合使用电锅炉和吸收式热泵既能有效提升机组的热电解耦能力,又能均衡系统的热经济性,该联合方案最小电负荷可降至30.37 MW,灵活性能力显著提升。

In order to promote the absorption of clean energy such as wind energy and solar energy,coal-fired units continued to participate in deep peak regulation,and it was urgent to carry out flexible transformation of cogeneration units.Based on the simulation model of intermediate extraction steam heating for a 660 MW pure condensing unit,three schemes of electric boiler heating(scheme 1),absorption heat pump heating(scheme 2)and combined heat supply of electric boiler and absorption heat pump(scheme 3)were proposed.The non-dominated sorting genetic algorithms-Ⅱ(NSGA-Ⅱ)and the technique for order preference by similarity to ideal solution(TOPSIS)analysis methods were used to optimize the capacity configuration of scheme 3,and the performance of thermoelectric decoupling capacity and thermal economy under different schemes was deeply analyzed.The results show that compared with absorption heat pump heating,electric boiler heating can greatly improve the flexibility of the unit with the expense of thermal economy.The integrated configuration of electric boiler and absorption heat pump can not only effectively improve the thermoelectric decoupling capacity of the unit,but also balance the thermal economy of the system,the minimum electric load can be reduced to 30.37 MW,and the flexibility is significantly improved.