作者：范志强¹, 焦晓峰¹, 魏超¹, 张学镭²

作者单位：1. 内蒙古电力科学研究院，内蒙古 呼和浩特 010020;
2. 华北电力大学，河北 保定 071003

关键词：热电联产;供热;低压缸零出力;调峰

摘要：

供热机组低压缸零出力运行可有效提升机组供热能力和调峰深度。该文基于Ebsilon软件，建立300 MW供热机组抽凝工况和低压缸零出力工况的数学模型，从热力性能、调峰性能和经济性能三个维度对常规抽凝模式和低压缸零出力模式进行分析。结果表明，低压缸零出力模式能够有效增加机组的供热能力，并降低发电标准煤耗率，当主蒸汽量为957.6 t/h时，供热量比常规抽凝供热模式提高16.25%，发电标准煤耗率下降27.2 g/kWh。低压缸零出力模式下，虽然供热机组的电负荷不具备调节能力，但其最小电负荷低于常规抽凝供热模式，适宜参与电网的深度调峰。从净收益最大化的角度，当热负荷在162~310 MW时，应采用低压缸零出力模式进行供热；当热负荷在310~375 MW时，应采用抽凝模式进行供热。

Thermodynamic and economic performance and peak load regulation capacity analysis of 300 MW cogeneration unit with low pressure cylinder near zero output mode
FAN Zhiqiang¹, JIAO Xiaofeng¹, WEI Chao¹, ZHANG Xuelei²
1. Inner Mongolia Power Research Institute, Hohhot 010020, China;
2. North China Electric Power University, Baoding 071003, China
Abstract: The cogeneration unit with low pressure cylinder near zero output can effectively improve the supplied heating load and the depth of peak load regulation. Based on Ebsilon software, the models of 300 MW cogeneration unit with extraction steam heating mode (ESHM) and low pressure cylinder near zero output mode (LPCNZM) were established, and the performances were analyzed from three dimensions of thermodynamic, peak load regulation and economy. The results show that LPCNZM can effectively increase the supplied heating capacity and reduce the standard coal consumption rate of power generation. When the main steam flow is 957.6 t/h, the supplied heating load is increased by 16.25% and the standard coal consumption rate is decreased by 27.2 g/kWh compared with ESHM. Although LPCNZM doesn’t have the ability to regulate the electric load, its minimum electric load is lower than that of ESHM. As a result, LPCNZM is suitable to participate in the deep peak load regulation of the grid. In order to maximize the net benefit, the cogeneration unit should operate with LPCNZM in the range of 162-310 MW of the heating load, and it should operate with ESHM in the range of 310-375 MW of the heating load.
Keywords: cogeneration;heating supply;low pressure cylinder near zero output;peak load regulation
2024, 50(4):166-172  收稿日期: 2022-07-08;收到修改稿日期: 2022-09-03
基金项目: 内蒙古电力（集团）有限责任公司科技项目资助（内电生〔2022〕6号）
作者简介: 范志强(1984-),男,内蒙古乌兰察布市人,高级工程师,硕士,从事汽轮机、燃气轮机调试和调速系统参数测试工作。
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