Analysis and Prospect of Transformation and Upgrading Effects of Coal-fired Power Units in China

doi:10.11930/j.issn.1004-9649.202402031

Abstract

Abstract:

The upgrading and transformation of coal-fired power plants serve as a pivotal means to enhance the cleanliness, efficiency, and flexibility of coal-fired power units, as well as to adapt to the shift towards a dual emphasis on foundational security and system regulation in coal-fired power generation. By analyzing the current status and effectiveness of coal-fired power unit upgrades in China, this study explores the major issues encountered during the upgrading process and proposes measures to promote such upgrades. It also offers a prospective view on the development of coal-fired power plant transformation. The research reveals that the energy-saving and carbon-reduction modifications in coal-fired power plants can reduce the average coal consumption for power supply under rated conditions by approximately 5 g/(kW·h). The flexibility enhancements enable the minimum output load of modified units to decrease from roughly 42% of the rated load to approximately 29% of the rated load. Additionally, the heating modifications increase the heat supply of modified units by approximately 56%. However, the upgrading process faces challenges such as the coordination of load rate and coal consumption for power supply, investment and returns, technology selection, and reliability. To address these issues, this study puts forward recommendations from the perspectives of operation, technology, and policy, providing valuable references for the orderly promotion of coal-fired power plant upgrades.

Key words: energy conservation and carbon reduction, flexibility transformation, heating renovation, three-renovation

Zhiqiang LIU, Jianfeng LI, Li PAN, Zhixuan WANG. Analysis and Prospect of Transformation and Upgrading Effects of Coal-fired Power Units in China[J]. Electric Power, 2024, 57(7): 1-11.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202402031

https://www.electricpower.com.cn/EN/Y2024/V57/I7/1

Figures/Tables 14

Fig.1 Requirements and main work contents of coal power transformation in different time stages

Fig.2 Completion of ultra-low emissions and energy-saving transformation of coal-fired power during the 13 th Five Year Plan period

Table 1 Identification standards for energy saving and carbon reduction transformation

机组类型		节能减碳改造认定标准/ (g·(kW·h)^–1)
常规机组	超超临界100万kW	≤285
	超超临界60万kW	≤293
	超临界60万kW	≤300
	超临界30万kW	≤300
	亚临界60万kW	≤302
	亚临界30万kW	≤311
	亚临界30万kW以下	≤311
空冷机组		常规+15
火焰炉机组		常规+9
循环流化床锅炉机组	湿冷机组	常规+15
循环流化床锅炉机组	空冷机组	常规+25

Fig.3 The completion of all coal power transformation

Fig.4 Energy saving and carbon reduction transformation effect

Fig.5 Statistics of main flexibility transformation technologies

Fig.6 Effect of unit flexibility transformation

Table 2 Different heating technology routes and their characteristics

供热技术		具体路线	相对供热能力	对汽机内效率影响	可靠性
抽汽		缸体打孔（连通管打孔）供暖	低	影响较大	高
热泵技术	吸收式	缸体打孔，耦合吸收式热泵从循环水或乏汽中提取热量供暖	较高	影响较大	较高
	压缩式	电压缩式热泵从乏汽（循环水）或环境中提取热量供暖	高	无影响	较高
	引射式	缸体打孔，耦合引射器引射乏汽供暖	较高	影响较大	较高
高背压或光轴		拆除末几级转子叶片	高	无影响	高
低压缸零出力		旁路切除低压缸	高	有影响	较高

Fig.7 Statistical chart of heating transformation project effects

Fig.8 Relationship between coal consumption load factor and unit load rate

Fig.9 Operation effect of flow passage transformation for unit

Fig.10 Changes in coal consumption during unit operation after flow modification and flexibility modification

Fig.11 Statistics of investment payback period for three reform linkage projects

Fig.12 Superheater overheating tube explosion

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