大型吸收式热电联产机组性能分析与对比

doi:10.16085/j.issn.1000-6613.2019-1340

摘要/Abstract

摘要：

燃煤热电联产机组在电能与热能的协调和转换中起到至关重要的作用，并且在未来一段时间内仍是我国北方冬季采暖的主力热源。本文构建了包含电厂侧和热力站侧两部分在内的一种热电联产系统方案，并研究了机组背压、供给热电比、汽水系统?效率、热网换热器?效率、机组发电量、热网水泵功率在变工况下和单独改变供热功率、供水温情况下的变化规律，开创了电热价比的方法对电热两种捆绑式生产的热电联产机组来衡量其整体经济收益，最后通过热网水质量流量、热电比、背压、抽凝比和发电煤耗率这些指标将新方案与传统热电联产方案进行了对比。结果表明：对于热电联产机组，系统热力学参数随工况、供热负荷和供水温度变化呈现不同规律；本文新提出的电热价比方法能为热电联产机组提供运行决策和收益预测规划；新方案可通过提升热网供回水温差可以显著提高系统供热能力和能源利用效率：使得发电煤耗率减小3.22～7.00g/(kW·h)，机组背压降低了65.07%，热网水流量减少了33.33%。

关键词: 热力学, 传热, 热电联产, 热电比, 效率, 电热价比, 经济收益

Abstract:

Coal-fired cogeneration units play a vital role in the coordination and conversion of electric energy and thermal energy, which will remain the main heat source for winter heating in northern China for some time to come. In this paper, a cogeneration system scheme including power plant side and heat station side was constructed, and the unit back pressure, supply thermoelectric ratio, steam and water system exergy efficiency, heat network heat exchanger entransy efficiency, unit power generation and heat network pump power under variable operating conditions and the change of heating power and water supply temperature alone were studied. Furthermore, this paper created a method of electric heating price ratio to measure the overall economic benefits of two combined heat and power units, and finally through the hot network water mass flow, thermoelectric ratio, back pressure, coagulation ratio and power generation coal consumption rate indicators to compare the new program with the traditional cogeneration program. The results showed that for the cogeneration unit, the thermodynamic parameters of the system show different rules with the working conditions, heating load and water supply temperature. The newly proposed electric heating price ratio method can provide operational decision and benefit prediction planning for cogeneration units. The new scheme can significantly improve the system heating capacity and energy utilization efficiency by increasing the temperature difference between the heating and returning water networks. The coal consumption rate of power generation was reduced by 3.2—7.00 g/(kW·h), and the back pressure of the unit was reduced by 65.07%. Water flow in networks was reduced by 33.33%.

Key words: thermodynamics, heat transfer, combined heat and power, thermoelectric ratio, entransy efficiency, electric heating price ratio, economic benefit

中图分类号:

TK11⁺5

刘浩晨, 耿直, 莫子渊, 顾煜炯. 大型吸收式热电联产机组性能分析与对比[J]. 化工进展, 2020, 39(5): 1682-1691.

Haochen LIU, Zhi GENG, Ziyuan MO, Yujiong GU. Performance analysis and comparison of large-scale absorption combined heat and power units[J]. Chemical Industry and Engineering Progress, 2020, 39(5): 1682-1691.

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