660 MW超超临界二次再热机组深度调峰试验研究

doi:10.3969/j.issn.1674-1951.2021.05.010

摘要/Abstract

摘要：

为适应碳达峰、碳中和目标下燃煤机组的发展趋势,研究了某660 MW超超临界二次再热机组的深度调峰。经过试验发现,该机组完全具备在30%额定负荷下的深度调峰能力：锅炉燃烧稳定、状态良好;主辅机控制与运行参数正常且稳定,具有一定的调节裕度;环保设备投运正常、污染物排放都达到国家规定的超低排放的标准。尽管如此,在30%额定负荷下运行时机组的经济效益明显下降,与50%额定负荷时相比,供电煤耗急剧增加,受汽机热耗率、锅炉热效率和厂用电率变化的影响共增加煤耗约49.0 g/（kW·h）。试验结果说明,深度调峰机组的运行参数还有待进一步调整和改进。

关键词: 深度调峰, 二次再热, 最低稳燃负荷, 30%额定负荷, 超超临界锅炉, 供电煤耗, 碳中和

Abstract:

To adapt to the development trend of coal-fired units in the context of realizing carbon peak and carbon neutrality, deep peak-load shaving study was made on a 660MW ultra-supercritical secondary reheating unit. The experiment verified that the unit performs well at 30% rated load. Under 30% rated load, the combustion in the boiler is stable and in good condition. The control and operation parameters of the main and auxiliary equipment are normal and stable with adjustment margins. The environmental protection equipment works well and keeps the discharged pollutant within the ultra-low emission standards of China. However, the economic performance of the unit running with 30% rated load is inferior to that with 50% rated load. Influenced by heat consumption for steam turbine unit,heat consumption for boiler and auxiliary power rate,coal consumption for power supply of the unit running with 30% rated load is much higher than that of the unit with 50% rated load,increasing by 49.0 g/（kW·h）.Thus,the parameters of units under deep peak-load shaving need to be further adjusted and optimized.

Key words: deep peak-load shaving, secondary reheating, minimum load for stable combustion, 30% rated load, ultra-supercritical boiler, coal consumption for power supply, carbon neutrality

中图分类号:

TK01 ⁺8：TM621

丛星亮, 谢红, 苏阳, 张骏, 程英捷. 660 MW超超临界二次再热机组深度调峰试验研究[J]. 华电技术, 2021, 43(5): 64-69.

CONG Xingliang, XIE Hong, SU Yang, ZHANG Jun, CHENG Yingjie. Experimental study on deep peak-load shaving of a 660 MW ultra-supercritical secondary reheating unit[J]. Huadian Technology, 2021, 43(5): 64-69.

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名称	单位	数值
热耗率验收(THA)工况功率	MW	660.0
额定主蒸汽压力	MPa	31.000
额定主蒸汽温度	℃	600.0
额定一次再热蒸汽压力	MPa	10.521
额定一次再热蒸汽温度	℃	620.0
额定二次再热蒸汽压力	MPa	3.211
额定二次再热蒸汽温度	℃	566.0
额定背压	kPa	4.7
额定给水温度	℃	315.0
THA工况热耗	kJ/(kW·h)	7 109

项目	单位	最大出力工况	额定负荷工况
过热蒸汽流量	t/h	1 785.49	1 733.48
过热蒸汽出口压力	MPa	32.45	32.36
过热蒸汽出口温度	℃	605.0	605.0
给水压力	MPa	36.45	36.14
给水温度	℃	314.0	314.0
一次再热蒸汽流量	t/h	1 668.69	1 602.84
一次再热器出口压力	MPa	11.05	10.59
一次再热器出口温度	℃	623.0	623.0
一次再热器进口压力	MPa	11.40	10.93
一次再热器进口温度	℃	436.0	428.0
二次再热蒸汽流量	t/h	1 425.42	1 365.49
二次再热器出口压力	MPa	3.33	3.18
二次再热器出口温度	℃	623.0	623.0
二次再热器进口压力	MPa	3.52	3.36
二次再热器进口温度	℃	442.0	442.0

名称	单位	数值
A/C/D给煤机给煤量	t/h	29.9/28.8/30.9
A/C/D磨煤机电流	A	39.0/45.7/43.0
A/C/D磨煤机入口一次风量	t/h	85.7/87.7/84.8
A/C/D磨煤机入口一次风温	℃	143.5/126.3/192.3
A/C/D磨煤机出口风粉温度	℃	80.1/81.0/80.5
A/C/D磨煤机热一次风门开度	%	23.3/18.6/20.5
A/C/D磨煤机冷一次风门开度	%	44.6/47.0/33.8
A/C/D磨煤机液压加载压力	MPa	5.60/4.80/4.70

名称	单位	数值
空预器主电机电流A/B	A	23.7/24.1
引风机动叶位置反馈A/B	%	37.90/37.30
引风机电流A/B	A	189.4/190.1
引风机入口压力A/B	kPa	-2.1/-2.1
送风机动叶位置反馈A/B	%	22.4/21.6
送风机电流A/B	A	55.1/55.1
送风机出口压力A/B	kPa	0.9/0.9
一次风机动叶位置反馈A/B	%	42.22/38.25
一次风机电流A/B	A	102.7/100.2
一次风机出口压力A/B	kPa	8.2/8.6
总风量	t/h	1 264.1
总一次风量	t/h	339.1
A/B 侧二次风量	t/h	482.3/442.7

名称	单位	稳态偏差
负荷率	%	+0.24,-0.30
主蒸汽压力	MPa	±0.14
主蒸汽温度	℃	±8.5
一次再热蒸汽温度	℃	±5.0
二次再热蒸汽温度	℃	±5.5