Deep Peak Shaving Technology for 330 MW Circulating Fluidized Bed Boiler

doi:10.12096/j.2096-4528.pgt.23164

Abstract

Abstract:

To promote the implementation of the “double carbon” policy and to manage the high volatility of new energy, the current requirements for deep peak shaving of thermal power units are getting higher and higher. Circulating fluidized bed (CFB) boiler units have inherent advantages under low load operation conditions. However, the ultra-low load operation below 20% still faces many difficulties, such as the stability of the fluidization in the furnace, the emission of nitrogen oxides, and the safety issues caused by local over-temperature in the furnace. This paper took the application of deep peaking technology of a 330 MW CFB boiler as an example and introduced the modification of the unit components, such as the coal conveying screening and crushing system, throttling rings of wind caps and lower secondary air pipes, etc. With the application of flue gas recirculation and other technologies, an 18% ultra-low load operation was successfully realized on this CFB boiler, and the NO _x emission was also well controlled. The key points and difficulties of the ultra-low load operating technology of CFB unit were summarized. The potential problems caused by deep peaking operation were analyzed, and corresponding measures were proposed. The results of this study have an important engineering reference value.

Key words: coal-fired power unit, circulating fluidized bed (CFB) boiler, deep peak shaving, ultra-low emission, flue gas recirculation

CLC Number:

TK 16

Sihai ZHANG, Chaoran LI, Guangliang WAN, Yinxue LIU, Hainan XU, Zhong HUANG, Hairui YANG. Deep Peak Shaving Technology for 330 MW Circulating Fluidized Bed Boiler[J]. Power Generation Technology, 2024, 45(2): 199-206.

Figures/Tables 8

References 23

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锅炉主要参数	锅炉最大连续出力工况下的数值
过热蒸汽流量/(t/h)	1 177
过热蒸汽压力/MPa	17.5
过热蒸汽温度/℃	541
再热蒸汽流量/(t/h)	979.6
再热蒸汽进(出)口压力/MPa	4.12(3.94)
再热蒸汽进(出)口温度/℃	341(541)
给水温度/℃	279.6

锅炉主要参数	锅炉最大连续出力工况下的数值
过热蒸汽流量/(t/h)	1 177
过热蒸汽压力/MPa	17.5
过热蒸汽温度/℃	541
再热蒸汽流量/(t/h)	979.6
再热蒸汽进(出)口压力/MPa	4.12(3.94)
再热蒸汽进(出)口温度/℃	341(541)
给水温度/℃	279.6

类别	粒径范围
类别	>13 mm	10~13 mm	3~10 mm	<3 mm
改造前质量占比/%	2.45	9.45	25.82	62.73
改造后质量占比/%	0.21	1.55	27.20	71.04

类别	粒径范围
类别	>13 mm	10~13 mm	3~10 mm	<3 mm
改造前质量占比/%	2.45	9.45	25.82	62.73
改造后质量占比/%	0.21	1.55	27.20	71.04

检测项目	入炉煤	原煤	煤泥
收到基碳质量分数/%	32.56	41.66	28.79
收到基氢质量分数/%	1.78	2.27	1.58
收到基氧质量分数/%	6.55	8.32	5.81
收到基氮质量分数/%	0.38	0.49	0.34
收到基硫质量分数/%	0.40	0.46	0.38
收到基水分质量分数/%	26.30	14.00	31.40
收到基灰分质量分数/%	32.02	32.80	31.70
收到基挥发分质量分数/%	35.70	35.81	35.66
收到基低位发热量/(MJ/kg)	11.30	15.39	9.60