Research on Combustion Stability of a 600 MW Subcritical Power Unit Under Long-Term Deep Peak Shaving

doi:10.12096/j.2096-4528.pgt.23016

Abstract

Abstract:

Deep peak shaving of thermal power units is a crucial technique for integrating new energy sources and altering energy consumption patterns. A 600 MW sub-critical coal-fired unit was chosen as the subject of research, and long-term operation tests were conducted at 15% and 20% rated load respectively. The impact of different parameters on fire detection fluctuation was analyzed through parameter analysis. Additionally, a sliding window-based method for analyzing drum water level and furnace negative pressure wave characteristics was proposed for determining furnace combustion stability. The results of the tests indicate that with plasma combustion stabilization and a calorific value of approximately 20 kJ/g for Junger coal, two sets of coal mills can maintain long-term combustion stability at 15%-20% rated load for a 24-hour period. Furthermore, the analysis reveals that the coal volume change rate, coal volume distribution, and primary air volume are the primary factors influencing fire detection fluctuation. Overall, this study has provided valuable insights for implementing long-term, deep peak regulation of similar units. The research results can provide a reference for long-time limit depth peak regulation of the same type of units.

Key words: thermal power units, deep peak shaving, flame detector fluctuation, combustion stability, correlation analysis

CLC Number:

TK 16

Zhijun JIA, Wei FAN, Shaojun REN, Tangbin WEI. Research on Combustion Stability of a 600 MW Subcritical Power Unit Under Long-Term Deep Peak Shaving[J]. Power Generation Technology, 2024, 45(2): 216-225.

Figures/Tables 27

References 21

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煤质指标	普准	高准
M_t/%	9.7	10.3
M_ad/%	4.3	4.4
A_ad/%	31.1	23.9
V_ad/%	25.4	27.4
S_t，ad/%	0.5	0.5
H_ad/%	3.8	3.3
Q_net/(kJ/g)	17.7	20.3
R₉₀/%	26	26

煤质指标	普准	高准
M_t/%	9.7	10.3
M_ad/%	4.3	4.4
A_ad/%	31.1	23.9
V_ad/%	25.4	27.4
S_t，ad/%	0.5	0.5
H_ad/%	3.8	3.3
Q_net/(kJ/g)	17.7	20.3
R₉₀/%	26	26

位置	二次风门开度/%
位置	15%负荷	20%负荷
SOFA1—7层角燃尽风风门位置	0	0
消旋风OFA二次风门位置	0	0
FF层二次风门位置	47	49
F层角周界风门位置	17	10
EF层偏转二次风门位置	20	26
E层周界风门位置	10	10
DE层偏转二次风门位置	13	15
D层周界风门位置	10	10
CD层角偏转油二次风门位置	25	15
C层角周界风门位置	10	10
BC层角启转二次风门位置	50	20
B层角周界风门位置	26	17
AB层偏转油二次风门位置	46	31
A层周界风门位置	28	20
AA层直吹二次风门位置	68	45

位置	二次风门开度/%
位置	15%负荷	20%负荷
SOFA1—7层角燃尽风风门位置	0	0
消旋风OFA二次风门位置	0	0
FF层二次风门位置	47	49
F层角周界风门位置	17	10
EF层偏转二次风门位置	20	26
E层周界风门位置	10	10
DE层偏转二次风门位置	13	15
D层周界风门位置	10	10
CD层角偏转油二次风门位置	25	15
C层角周界风门位置	10	10
BC层角启转二次风门位置	50	20
B层角周界风门位置	26	17
AB层偏转油二次风门位置	46	31
A层周界风门位置	28	20
AA层直吹二次风门位置	68	45

调控指标	15%额定负荷	20%额定负荷
负荷/MW	88.3~92.8	118.1~122.2
A磨煤量/(t/h)	30.1~37.5	37.1~43.6
B磨煤量/(t/h)	24.3~31.7	34.9~44.5
A磨一次风量/(t/h)	69.2~91.2	81.1~88.1
B磨一次风量/(t/h)	74.1~88.3	90.4~98.8