双碳背景下电除尘器的节能减碳分析

doi:10.12096/j.2096-4528.pgt.21063

摘要/Abstract

摘要：

双碳背景下节能提效是燃煤电厂减碳的第一优选，通过对超低排放改造前后干式电除尘器、湿式电除尘器、辅助设备及除尘技术路线进行能效参数分析评测，挖掘其节能减碳空间。超低排放改造前，300 MW级、600 MW级、1 000 MW级机组配套干式电除尘器的高压电耗对应的CO₂年排放量分别约为6 000、9 000、14 000 t，且电除尘性能越好，对应的能耗及CO₂排放量越高；超低排放改造后，1 000 MW级机组配套电除尘器的高压供电电耗对应的CO₂年排放量约为18 000 t，较超低排放改造前增加了约20%，但通过节能优化可减排约60%。300 MW级、600 MW级、1 000 MW级机组配套湿式电除尘器的高压供电电耗对应的CO₂年排放量分别约为2 000、2 500、3 400 t；630 MW机组低温省煤器可年减排CO₂约19 000 t，280 t/h炉相变凝聚器可年减排CO₂约8 000 t。与湿式电除尘技术路线相比，660 MW机组以低低温电除尘技术为核心的烟气协同治理技术路线可年减排CO₂约3 000 t。研究结果可为后续燃煤电厂碳减排提供参考。

关键词: 燃煤电厂, 超低排放, 电耗, CO₂减排, 碳达峰, 碳中和

Abstract:

Energy conservation and efficiency improvement under the dual carbon background is the first choice for coal-fired power plants to reduce carbon. The energy efficiency parameters of dry electrostatic precipitator (ESP), wet electrostatic precipitator (WESP), auxiliary equipment and dust removal technology route before and after ultra-low emission transformation were analyzed and evaluated, which could excavate their energy saving and carbon reduction space. Before the transformation of ultra-low emission, the annual CO₂ emissions corresponding to the high voltage power consumption of 300 MW, 600 MW and 1000 MW units supporting dry ESP are about 6 000 t, 9 000 t and 14 000 t respectively. In addition, the better the performance of ESP, the higher the corresponding energy consumption and CO₂ emission. After the ultra-low emission transformation, the annual CO₂ emission corresponding to the high-voltage power supply power consumption of the 1000 MW unit supporting the ESP is about 18 000 t, which increases by about 20% compared with that before the transformation, but could be reduced by about 60% through the energy saving optimization. The annual CO₂ emissions corresponding to the high-voltage power supply power consumption of the 300 MW, 600 MW and 1000 MW units supporting the WESP are about 2 000 t, 2500 t and 3400 t, respectively. The low temperature economizer of 630 MW unit could reduce the annual CO₂ emission by about 19000 t, and the phase change condenser of 280 t/h furnace could reduce the annual CO₂ emission by about 8 000 t. Compared with the WESP removal technology route, the flue gas cooperative treatment technology route of 660 MW unit with low-low temperature ESP removal technology as the core could reduce the annual CO₂ emission by about 3 000 t. This paper could provide technical ideas for the carbon emission reduction of subsequent coal-fired power plants.

Key words: coal-fired power, ultra-low emission, power consumption, CO₂ emission reduction, carbon peak, carbon neutral

中图分类号:

TK 09

刘含笑. 双碳背景下电除尘器的节能减碳分析[J]. 发电技术, 2023, 44(5): 738-744.

Hanxiao LIU. Energy Saving and Carbon Reduction Analysis of Electrostatic Precipitator Under Double Carbon Background[J]. Power Generation Technology, 2023, 44(5): 738-744.

图/表 9

图1 不同煤种热值及CO2排放系数

Fig. 1 Calorific value and CO2 emission coefficient of different kinds of coal

图2 超低排放改造前电除尘器高压供电电耗

Fig. 2 Power consumption of high-voltage power supply of ESP before ultra-low emission renovation

图3 超低排放改造前电除尘器CO2排放数据统计

Fig. 3 CO2 emission data of ESP before ultra-low emission renovation

图4 某300 MW级机组配套电除尘器能效参数

Fig. 4 Energy efficiency parameters of an electric precipitator for a 300 MW unit

图5 超低排放改造后电除尘器高压供电电耗及对应CO2排放数据统计

Fig. 5 Power consumption of high-voltage power supply and the corresponding CO2 emission data of ESP after ultra-low emission renovation

图6 不同电控模式时电除尘器高压供电电耗及对应CO2排放数据统计

Fig. 6 Power consumption of high-voltage power supply and the corresponding CO2 emission data of ESP under different electric control modes

图7 湿式电除尘器高压供电电耗

Fig. 7 High-voltage power supply power consumption of WESP

图8 湿式电除尘器对应CO2排放数据统计

Fig. 8 Corresponding CO2 emission data of WESP

图9 低温省煤器能效数据

Fig. 9 Energy efficiency data of low temperature economizer

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