供热改造对火电机组性能的影响分析

doi:10.16085/j.issn.1000-6613.2022-1390

摘要/Abstract

摘要：

为了解决机组进行供热或供热梯级利用改造后，因运行负荷超出设计范围导致能耗升高的问题，本文提出了一种新的供热改造能耗评估方法。以国内某600MW机组为例，采用Ebsilon建立了机组的热力学模型，并验证了模型的正确性，以热耗率作为机组性能评价指标，分析了不同供热改造参数及热电负荷下机组产出能量和热耗率的分布规律，同时提出了供热经济基准线及供热经济区间的概念。结果表明：机组最小供热抽汽压力对机组低压缸发电功率影响较为明显；随着最小供热抽汽压力的升高，供热经济基准线逐渐右移，供热经济区间的范围逐渐缩小。当机组负荷位于供热经济基准线左侧时，机组供热能耗增加；负荷位于供热经济基准线右侧时（供热经济区间），机组供热能耗降低。因此，机组进行供热及供热梯级利用改造后实际运行过程中并非一定节能，应根据机组负荷范围合理选择改造参数。

关键词: 热电联产, 供热改造参数, 热耗率, 供热经济基准线, 供热经济区间

Abstract:

To solve the problem of energy consumption increase caused by the operation load exceeding the design range after unit heating or heating cascade utilization transformation, a new energy consumption evaluation method for heating transformation was proposed in this paper. Taking a 600MW unit in China as an example, the thermodynamic model of the unit was established using Ebsilon software, and the correctness of the model was verified. The distribution law of heat rate and output energy of the unit under different heating transformation parameters and thermoelectric loads were analyzed using the heat rate as the unit performance evaluation index. Then the concepts of heating economic benchmark line and heating economic operation area were proposed. The results showed that the minimum heating extraction pressure of the unit had an obvious influence on the generating power of the low-pressure cylinder of the unit. With the increase of the minimum heating extraction pressure, the scope of the heating economic baseline gradually moved to the right, and the scope of the heating economic operation area was gradually reduced. When the unit load was located on the left side of the heating economic baseline, the unit heating energy consumption increased. when the unit load was located on the right side of the heating economic baseline (heating economic operation area), the unit heating energy consumption decreased. Therefore, the actual operation process of the unit after heating and heating cascade utilization transformation was not necessarily energy-saving, and the transformation parameters should be reasonably selected according to the load range of the unit.

Key words: combined heat and power, heating transformation parameters, heat rate, heating economic baseline, heating economic operation area

中图分类号:

TM621

王子杰, 陆树银, 赵梓良, 王宁, 顾煜炯. 供热改造对火电机组性能的影响分析[J]. 化工进展, 2023, 42(5): 2325-2331.

WANG Zijie, LU Shuyin, ZHAO Ziliang, WANG Ning, GU Yujiong. Analysis of the influence of heating transformation on the performance of thermal power unit[J]. Chemical Industry and Engineering Progress, 2023, 42(5): 2325-2331.

图/表 6

参考文献 24

1	赵春生, 杨君君, 王婧, 等. 燃煤发电行业低碳发展路径研究[J]. 发电技术, 2021, 42(5): 547-553.
	ZHAO Chunsheng, YANG Junjun, WANG Jing, et al. Research on low-carbon development path of coal-fired power industry[J]. Power Generation Technology, 2021, 42(5): 547-553.
2	黄畅, 张攀, 王卫良, 等. 燃煤发电产业升级支撑我国节能减排与碳中和国家战略[J]. 热力发电, 2021, 50(4): 1-6.
	HUANG Chang, ZHANG Pan, WANG Weiliang, et al. The upgradation of coal-fired power generation industry supports China’s energy conservation, emission reduction and carbon neutrality[J]. Thermal Power Generation, 2021, 50(4): 1-6.
3	张智刚, 康重庆. 碳中和目标下构建新型电力系统的挑战与展望[J]. 中国电机工程学报, 2022, 42(8): 2806-2819.
	ZHANG Zhigang, KANG Chongqing. Challenges and prospects for constructing the new-type power system towards a carbon neutrality future[J]. Proceedings of the CSEE, 2022, 42(8): 2806-2819.
4	DOROTIĆ H, PUKŠEC T, SCHNEIDER D R, et al. Evaluation of district heating with regard to individual systems—Importance of carbon and cost allocation in cogeneration units[J]. Energy, 2021, 221: 119905.
5	WANG Zijie, GU Yujiong, LIU Haochen, et al. Optimizing thermal-electric load distribution of large-scale combined heat and power plants based on characteristic day[J]. Energy Conversion and Management, 2021, 248: 114792.
6	曹欢, 张光明, 牛玉广, 等. 耦合热泵的热电联产机组机理模型研究[J]. 热力发电, 2021, 50(3): 129-137.
	CAO Huan, ZHANG Guangming, NIU Yuguang, et al. Mechanism model analysis for CHP units coupled with heat pump[J]. Thermal Power Generation, 2021, 50(3): 129-137.
7	李定青, 李德波, 董启盛. 50MW纯凝生物质机组供热改造方案[J]. 山东电力技术, 2022, 49(1): 60-64.
	LI Dingqing, LI Debo, DONG Qisheng. Feasibility analysis of heat-supply alteration in 50MW condensing biomass power unit[J]. Shandong Electric Power, 2022, 49(1): 60-64.
8	吴正民, 余国瑶, 戴巍, 等. 5kW(e)级自由活塞斯特林发电机热电联产性能研究[J]. 中国电机工程学报, 2018, 38(11): 3275-3280.
	WU Zhengmin, YU Guoyao, DAI Wei, et al. Performance of the CHP system by using a 5kW(e) class free piston stirling generator[J]. Proceedings of the CSEE, 2018, 38(11): 3275-3280.
9	韩中合, 肖炜刚, 安国银. 大型汽轮机供热改造方案研究[J]. 汽轮机技术, 2016, 58(3): 198-200, 168.
	HAN Zhonghe, XIAO Weigang, AN Guoyin. Research of heating retrofitting schemes for large steam turbine[J]. Turbine Technology, 2016, 58(3): 198-200, 168.
10	莫子渊, 顾煜炯, 陆树银, 等. 600MW超临界供热机组能量梯级利用及对比分析[J]. 电力科学与工程, 2021, 37(4): 55-62.
	MO Ziyuan, GU Yujiong, LU Shuyin, et al. Energy cascade utilization and comparative analysis of 600MW supercritical heating unit[J]. Electric Power Science and Engineering, 2021, 37(4): 55-62.
11	张福祥. 热电联产机组能量梯级利用及灵活调峰运行[D]. 北京: 华北电力大学(北京), 2020.
	ZHANG Fuxiang. Energy cascade utilization and flexibility enhancement of the combined heat and power unit[D]. Beijing: North China Electric Power University, 2020.
12	陆树银, 刘浩晨, 顾煜炯, 等. 大型热电联产机组供热改造分析[J]. 工程热物理学报, 2022, 43(5): 1182-1189.
	LU Shuyin, LIU Haochen, GU Yujiong, et al. Thermodynamic analysis of heating reformation of large-scale CHP[J]. Journal of Engineering Thermophysics, 2022, 43(5): 1182-1189.
13	王立功, 许继东, 徐钢, 等. 热电联产机组供热抽汽余压利用节能机理[J]. 热力发电, 2019, 48(5): 8-13.
	WANG Ligong, XU Jidong, XU Gang, et al. Energy saving mechanism of waste pressure utilization of extraction steam for heating in combined heat and power cogeneration units[J]. Thermal Power Generation, 2019, 48(5): 8-13.
14	刘浩晨, 耿直, 顾煜炯. 基于膨胀机-热泵（st-hp）的大型吸收式热电联产机组集中供热方法[J]. 化工进展, 2020, 39(2): 468-477.
	LIU Haochen, GENG Zhi, GU Yujiong. Central heating supply method of large scale absorption CHP based on st-hp[J]. Chemical Industry and Engineering Progress, 2020, 39(2): 468-477.
15	谷军生, 姜占文, 吴俊杰. 余热梯级利用在热网改造场景中的应用浅析[J]. 汽轮机技术, 2020, 62(6): 473-474, 477.
	GU Junsheng, JIANG Zhanwen, WU Junjie. The analysis of cascade utilization of surplus heat in heat network retrofitting system[J]. Turbine Technology, 2020, 62(6): 473-474, 477.
16	崔殊杰, 王玮, 杨利, 等. 燃煤发电机组供热蒸汽余压梯级利用方案[J]. 能源与节能, 2022, 197(2): 24-28.
	CUI Shujie, WANG Wei, YANG Li, et al. Cascade utilization scheme for surplus pressure of extraction steam from coal fired generating units[J]. Energy and Energy Conservation, 2022, 197(2): 24-28.
17	熊军, 廖晔, 胡宪法, 等. 溴化锂吸收式热泵的动态建模及运行特性分析[J]. 热能动力工程, 2022, 37(2): 122-128, 159.
	XIONG Jun, LIAO Ye, HU Xianfa, et al. Analysis of dynamic of modeling and operation characteristics of LiBr absorption heat pump[J]. Journal of Engineering for Thermal Energy and Power, 2022, 37(2): 122-128, 159.
18	孙健, 马世财, 霍成, 等. 耦合热泵换热器的原理及变工况性能研究[J]. 工程热物理学报, 2021, 42(1): 9-15.
	SUN Jian, MA Shicai, HUO Cheng, et al. Study on a hybrid heat exchanger based on absorption and compression cycles[J]. Journal of Engineering Thermophysics, 2021, 42(1): 9-15.
19	郭中旭, 戈志华, 赵世飞, 等. 耦合吸收式热泵机组变工况分析[J]. 热能动力工程, 2018, 33(2): 25-32.
	GUO Zhongxu, GE Zhihua, ZHAO Shifei, et al. Analysis of the off-design operation conditions of a coupled absorption type heat pump unit[J]. Journal of Engineering for Thermal Energy and Power, 2018, 33(2): 25-32.
20	米玉鸿, 冯林魁, 柏建华, 等. 亚临界热电联产机组耦合吸收式热泵系统热经济性及环境效益分析[J]. 热能动力工程, 2022, 37(4): 94-99.
	MI Yuhong, FENG Linkui, BAI Jianhua, et al. Analysis of thermal economy and environmental benefits of subcritical cogeneration units coupled with absorption heat pump system[J]. Journal of Engineering for Thermal Energy and Power, 2022, 37(4): 94-99.
21	张抖, 张光明, 牛玉广, 等. 吸收式热泵对热电联产机组调峰能力影响分析[J]. 热力发电, 2021, 50(10): 95-100, 129.
	ZHANG Dou, ZHANG Guangming, NIU Yuguang, et al. Effect of absorption heat pump on peak regulation capacity of combined heat and power unit[J]. Thermal Power Generation, 2021, 50(10): 95-100, 129.
22	王新军, 李亮, 宋立明. 汽轮机原理[M]. 西安: 西安交通大学出版社, 2014.
	WANG Xinjun, LI Liang, SONG Liming. Turbine principle[M]. Xi’an: Xi’an Jiaotong University Press, 2014.
23	国家能源局. 火力发电厂技术经济指标计算方法: [S]. 北京: 中国电力出版社, 2015.
	National Energy Administration of the People’s Republic of China. Calculating method of economical and technical index for thermal power plant: [S]. Beijing: China Electric Power Press, 2015.
24	曹丽华, 王文龙, 罗桓桓, 等. 深度调峰工况下汽轮机低压缸最小流量的确定[J]. 机械工程学报, 2020, 56(16): 98-108.
	CAO Lihua, WANG Wenlong, LUO Huanhuan, et al. Determination of minimum flow rate of low pressure cylinder of steam turbine under deep peak load regulation conditions[J]. Journal of Mechanical Engineering, 2020, 56(16): 98-108.

项目	100%THA	75%THA	50%THA	40%THA	30%THA
设计值/MW	600	450	300	240	180
模拟值/MW	601.225	449.817	299.329	239.258	179.595
相对误差/%	0.204	0.041	0.224	0.309	0.225

项目	100%THA	75%THA	50%THA	40%THA	30%THA
设计值/MW	600	450	300	240	180
模拟值/MW	601.225	449.817	299.329	239.258	179.595
相对误差/%	0.204	0.041	0.224	0.309	0.225

项目	100%THA	75%THA	50%THA	40%THA	30%THA
设计值/kJ·kWh^-1	7522	7678	8008	8257	8562
模拟值/kJ·kWh^-1	7518.3	7680.7	8015.5	8267.1	8576.9
相对误差/%	0.049	0.035	0.094	0.122	0.174

项目	100%THA	75%THA	50%THA	40%THA	30%THA
设计值/kJ·kWh^-1	7522	7678	8008	8257	8562
模拟值/kJ·kWh^-1	7518.3	7680.7	8015.5	8267.1	8576.9
相对误差/%	0.049	0.035	0.094	0.122	0.174

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