深度调峰机组电动给水泵的变频改造节能分析

doi:10.3976/j.issn.1002-4026.2022.03.007

Abstract

Abstract:

To improve the throttling loss of an electric water feed pump during the deep peak shaving operation of northeast coal-fired units, and the utilization rate of electric energy and coal consumption, a 600 MW electric water feed pump unit in power plant is taken as an example, using a frequency conversion scheme, under different working conditions (100%, 92%, 83%, 67%, 60%, 53%, and 50% rated loads), to analyze the power and frequency conversion conditions of single and double water feed pumps and identify the relationship between the flow rate, load, electrical efficiency, and active power of the motor. The test results show that the lower the flow, the more greater will be the improvements in the electrical efficiency and active power of the motor, up to 30% and 33%, respectively, subsequent to frequency conversion. Frequency conversion transformation is suitable for this unit, reducing the plant power consumption rate by 0.45%~0.87%, the power saving rate is 21%~33%. The variable frequency drive has a significant energy-saving effect on the deep peak shaving operation of the unit, providing a certain degree of reference for the transformation of the same type of unit.

Key words: :deep peak shaving, power plant boiler water feed pump, frequency conversion transformation, power saving, energy saving

CLC Number:

TM343

ZHAO Xue-shan,PAN Xiao-jun. Energy-saving analysis of the frequency conversion transformation of an electric boiler water feed pump of the deep peak regulation unit[J].Shandong Science, 2022, 35(3): 54-61.

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References 11

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工况情况			发电机功率/ MW	入口水流量/ (t · h^-1)	前置泵入口水压力/MPa	勺管反馈/ %	电流/A	出口水压力/ MPa
A泵组	100%负荷工况	改造前	600	1 128	0.97	68.7	531.2	19.3
	100%负荷工况	改造后	600	1 128	0.97	100.0	406.2	19.3
	92%负荷工况	改造前	550	1 011	0.92	63.4	479.8	18.5
	92%负荷工况	改造后	550	1 011	0.92	100.0	340.5	18.5
	83%负荷工况	改造前	500	938	0.87	56.8	426.7	17.3
	83%负荷工况	改造后	500	938	0.87	100.0	321.3	17.3
B泵组	100%负荷工况	改造前	600	1 148	0.97	68.8	521.8	19.3
	100%负荷工况	改造后	600	1 148	0.97	100.0	408.9	19.3
	92%负荷工况	改造前	550	1 012	0.93	63.7	483.3	18.4
	92%负荷工况	改造后	550	1 012	0.93	100.0	341.0	18.4
	83%负荷工况	改造前	500	940	0.87	57.3	434.0	17.3
	83%负荷工况	改造后	500	940	0.87	100.0	322.0	17.3

工况情况			进出口平均密度/ (kg·m^-3)	机械效率/%	扬程/m	有效功率/ kW	电效率/%	电机有功功率/kW	节能量/ (kW·h^-1)
A泵组	100%负荷工况	改造前	899.5	74	2 138.7	6 785.2	80	8 464.0	1 991.3
	100%负荷工况	改造后	900.5	85	2 021.0	6 004.0	93	6 472.7	1 991.3
	92%负荷工况	改造前	901.0	75	2 077.8	5 836.0	76	7 644.9	2 019.6
	92%负荷工况	改造后	904.6	84	1 889.7	5 108.0	94	5 625.3	2 019.6
	83%负荷工况	改造前	904.2	74	1 833.0	4 706.8	69	6 799.0	2 178.5
	83%负荷工况	改造后	907.2	84	1 876.2	4 774.2	93	4 620.4	2 178.5
B泵组	100%负荷工况	改造前	900.1	89	2 133.3	6 669.5	80	8 314.2	1 799.2
	100%负荷工况	改造后	900.3	80	2 021.8	6 020.8	92	6 515.0	1 799.2
	92%负荷工况	改造前	901.4	85	2 072.6	5 831.0	76	7 701.4	2 067.7
	92%负荷工况	改造后	904.5	79	1 889.0	5 100.0	94	5 633.7	2 067.7
	83%负荷工况	改造前	904.5	85	1 832.9	4 758.6	69	6 915.0	2 182.5
	83%负荷工况	改造后	907.1	81	1 876.0	4 743.7	92	4 732.5	2 182.5

工况情况			发电机功率/ MW	入口水流量/ (t·h^-1)	前置泵入口水压力/MPa	勺管反馈/ %	电流/A	出口水压力/ MPa
A泵组	67%负荷工况	改造前	400	1 475	0.76	67.2	545.1	14.0
	67%负荷工况	改造后	400	1 475	0.76	100.0	413.7	14.0
	60%负荷工况	改造前	360	1 370	0.70	59.7	483.7	13.4
	60%负荷工况	改造后	360	1 370	0.70	100.0	358.5	13.4
	53%负荷工况	改造前	320	1 300	0.58	55.3	436.3	13.0
	53%负荷工况	改造后	320	1 300	0.58	100.0	348.8	13.0
	50%负荷工况	改造前	290	1 172	0.60	52.8	403.8	12.0
	50%负荷工况	改造后	290	1 172	0.60	100.0	271.6	12.0

工况情况			进出口平均密度/ (kg·m^-3)	机械效率	扬程/m	有效功率/ kW	电效率/%	电机有功功率/kW	节能量/ (kW·h^-1)
A泵组	67%负荷工况	改造前	910.4	0.67	1 570.2	6 307.9	73	8 686.3	1 794.7
	67%负荷工况	改造后	909.4	0.72	1 376.6	5 532.3	84	6 891.6	1 794.7
	60%负荷工况	改造前	913.0	1.00	1 422.7	5 352.2	69	7 706.7	1 995.0
	60%负荷工况	改造后	916.8	0.80	1 408.7	5 212.3	91	5 711.7	1 995.0
	53%负荷工况	改造前	919.0	0.70	1 411.9	4 673.2	67	7 451.4	2 093.5
	53%负荷工况	改造后	927.0	0.79	1 347.1	5 059.8	91	5 357.9	2 093.5
	50%负荷工况	改造前	919.6	0.66	1 245.6	4 034.7	63	6 433.8	2 106.6
	50%负荷工况	改造后	923.5	0.81	1 274.8	4 014.3	93	4 327.2	2 106.6

工况名称	每小时节电量/(kW·h)	总节电率/%	年节电费用/万元	年节煤量/t	厂用电降低率/%
100%负荷工况	3 790.5	23	828.3	8 183.1	0.63
92%负荷工况	4 087.3	27	893.2	8 823.9	0.74
83%负荷工况	4 361.0	32	953.0	9 414.7	0.87
67%负荷工况	1 794.7	21	392.2	3 874.5	0.45
60%负荷工况	1 995.0	26	436.0	4 306.9	0.55
53%负荷工况	2 093.5	30	457.5	4 519.6	0.65
50%负荷工况	2 106.6	33	460.3	4 547.8	0.73

Energy-saving analysis of the frequency conversion transformation of an electric boiler water feed pump of the deep peak regulation unit

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