Improvement of deep peak regulation and comprehensive peak shaving technologies for coal-fired units

doi:10.3969/j.issn.2097-0706.2022.04.006

Abstract

Abstract:

With the development of the new-energy-oriented power system to pursue carbon peaking and carbon neutrality,low-load operation and participation in deep load regulation has become the ordinary state for coal-fired units.Though there is no constraint on the stable operation of the units running at 40%ECR,the constraints for those units at 30%ECR or a lower load should not be ignored.Many technical approaches and transformation are taken to alleviate the intrinsic constraints of the units,and new peak shaving technologies such as those integrated multi-form energy storage,CCUS and multi-energy coupling regulation are proposed.The results show that efficient technical approaches and transformation can improve the peak load regulating performance of units,and raise the dry-wet state transition point of an ultra-super critical boiler by over 6% rated load.Since it is hard to meet the demand of further peak shaving by exploring the potential in a coal-fired unit,comprehensive peak shaving technologies is feasible and crucial in further peak shaving regulation.

Key words: deep peak regulation, constraint, coal-fired unit, comprehensive peak shaving, rated load, carbon neutrality, energy storage, CCUS, new power system

CLC Number:

TK227.1

TONG Jialin, WU Ruikang, MAO Jianbo, LYU Hongkun. Improvement of deep peak regulation and comprehensive peak shaving technologies for coal-fired units[J]. Integrated Intelligent Energy, 2022, 44(4): 43-50.

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机组类型	额定过热蒸汽温度	实际过热蒸汽温度	偏差	额定再热蒸汽温度	实际再热蒸汽温度	偏差
超超临界1 000 MW	605	597	8	603	586	17
超超临界660 MW	605	582	23	613	596	17
超临界600 MW	571	563	8	569	563	6
超临界350 MW	571	558	13	569	555	14
亚临界600 MW	538	510	28	538	500	38
亚临界300 MW	541	538	3	541	523	18

机组类型	实际值	保证值	裕量值
超超临界1 000 MW	330	300	30
超超临界660 MW	325	305	20
超临界600 MW	340	300	40
超临界350 MW	300	291	9
亚临界600 MW	345	305	40
亚临界300 MW	330	300	30

项目	分级省煤器		省煤器烟气旁路		^#0高压加热器
项目	40%ECR	30%ECR	40%ECR	30%ECR	40%ECR	30%ECR
SCR入口烟气温度/℃	304~310	304~308	311~318	302~308	326~332	321~325
空气预热器入口烟气温度/℃	287~291	285~288	304~308	298~303	325~327	313~317
SCR入口烟气NO_x质量浓度/（mg·m^-3）	138.0~196.0	261.0~293.0	437.0~439.0	487.0~500.0	284.0~352.0	361.0~441.0
SCR出口烟气NO_x质量浓度/（mg·m^-3）	13.6~35.5	14.8~20.0	36.1~46.2	40.6~45.4	19.2~23.8	46.2~52.1
技术特点	调节不灵活,需兼顾高低负荷		调节灵活,防挡板卡涩		调节不灵活,需兼顾高低负荷
影响锅炉效率	不影响		影响		影响