作者：胡乔良, 李伟, 郜宁, 刘伟, 林翔

作者单位：国网新疆电力有限公司电力科学研究院，新疆 乌鲁木齐 830000

关键词：热泵供热;变工况;热经济性能;最大供热能力

摘要：

利用吸收式热泵回收循环水中的余热能够提高系统供热能力，增加发电量，提高能源利用率。以东北地区某2×350 MW供热机组为例，对1号机组进行供热系统改造，增加吸收式热泵回收循环水余热。建立热力计算模型，基于供热负荷的变化，对热泵供热系统供暖期内的变工况进行模拟。比较改造前后两种供热模式在相同热负荷下的热经济性能；发掘并对比不同供热模式的最大供热能力。结果表明：随着供热负荷的增加，热网回水温度升高，热泵性能系数COP下降。改造后的热泵供热模式热经济性能要优于传统供热模式，在相同供热负荷下，热泵供热模式的总的供热抽汽量明显低于传统抽凝供热模式；总的发电量比传统抽凝供热模式增加3%左右；发电标准煤耗比传统抽凝供热模式最大降低近3%。改造后的热泵供热模式能满足的最大供热面积比传统抽凝供热模式增大17.5%，表明对机组进行热泵改造能够有效增加机组最大供热能力。

Off–design performance analysis of absorption heat pump heating supplying units based on heating load
HU Qiaoliang, LI Wei, GAO Ning, LIU Wei, LIN Xiang
Electric Power Research Institute of State Grid Xinjiang Electric Power Co., Ltd., Urumqi 830000, China
Abstract: Heat recovery from circulating water utilizing absorption heat pump can improve heating supplying capacity of the system and increase power generation and energy utilization efficiency. Taking a 2×350 MW heating supply power units as example, the heating supply system of unit 1 was reformed, and an absorption heat pump was added for recovery of waste heat from circulating water. According to the established thermodynamic model, the off-design performance was simulated based on heating load. The thermal economic performance was compared between the two heating models before and after the reformation under the same heating load. Calculate and compare the maximum heating area of the both heating model. Results show that with the increasing of heating load, the temperature of heating network water rises up, and the heat pump COP decreases. The absorption heat pump heating supplying model is superior to the traditional extraction heating supplying model. Under the same heating load, the total heating extraction volume of heat pump hating model is significantly lower than the tradition extraction heating model, the total power generation increases by about 3% the tradition extraction heating model, and the maximum reduction of standard coal consumption rate is nearly 3%. The maximum heating area of heat pump hating model can be increased by 17.5% compared with the traditional extraction heating model, and the maximum heating capacity of the original unit is obviously increased.
Keywords: heat pump heating;off-design;thermal-economic performance;maximum heating capacity
2020, 46(11):163-168  收稿日期: 2019-05-31;收到修改稿日期: 2019-07-02
基金项目: 国家电网公司科技项目资助（SGXJDK00TSJS1800089)
作者简介: 胡乔良(1984-),男,重庆垫江县人,工程师,硕士,主要从事火电机组节能优化相关研究
参考文献
[1] 付林, 江亿, 张世钢. 基于Co—ah循环的热电联产集中供热方法[J]. 清华大学学报: 自然科学版, 2008, 48(9): 1377-1380
[2] FU L, LI Y, ZHANG S, et al. A district heating system based on absorption heat exchange with CHP systems[J]. Frontiers of Energy and Power Engineering in China, 2010, 4(1): 77-83
[3] SRIKHIRIN P, APHORNRATANA S, CHUNGPAIBULPATANA S. A review of absorption refrigeration technologies[J]. Renewable and sustainable energy reviews, 2001, 5(4): 343-372
[4] 程钧培. 节能减排与火电新技术[J]. 动力工程, 2009, 29(1): 1-4
[5] SUN F, FU L, ZHANG S, et al. New waste heat district heating system with combined heat and power based on absorption heat exchange cycle in China[J]. Applied Thermal Engineering, 2012, 37: 136-144
[6] 李岩, 付林, 张世钢, 等. 电厂循环水余热利用技术综述[J]. 建筑科学, 2010(10): 10-14
[7] LI Y, FU L, ZHANG S, et al. A new type of district heating method with co-generation based on absorption heat exchange (co-ah cycle)[J]. Energy Conversion and Management, 2011, 52(2): 1200-1207
[8] 李岩, 付林, 张淑彦. 凝汽余热利用对大型供热机组性能的影响[J]. 热力发电, 2015(4): 6-10
[9] 戈志华, 陈玉勇, 李沛峰, 等. 基于当量抽汽压力的大型热电联产供热模式研究[J]. 动力工程学报, 2014, 34(7): 569-575
[10] 李建锋, 马庆中, 黄海涛, 等. 吸收式热泵在供热机组中的应用分析[J]. 中国电力, 2013, 46(4): 25-27,31
[11] 张学镭, 陈海平. 回收循环水余热的热泵供热系统热力性能分析[J]. 中国电机工程学报, 2013, 33(8): 1-8
[12] 赵斌, 杨玉华, 钟晓晖, 等. 循环水吸收式热泵供热联产机组性能分析[J]. 汽轮机技术, 2013, 55(6): 454-457
[13] 万燕, 孙诗梦, 戈志华, 等. 大型热电联产机组高背压供热改造全工况热经济分析[J]. 电力建设, 2016, 37(4): 131-137
[14] 郑体宽, 杨晨. 热力发电厂[M]. 北京: 中国电力出版社, 2008.