Experimental study on deep peak-load shaving of a 660 MW ultra-supercritical secondary reheating unit

doi:10.3969/j.issn.1674-1951.2021.05.010

Abstract

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

CLC Number:

TK01 ⁺8：TM621

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