粉量分布不均对1000 MW机组对冲锅炉的影响及调整

doi:10.11930/j.issn.1004-9649.202304081

摘要/Abstract

摘要：

针对1000 MW机组对冲锅炉存在的偏烧问题进行了试验研究，结果发现粉量不均是偏烧的主要原因。粉量分布、煤粉细度分布均呈现典型的间隔分布趋势，且两者分布呈正相关。粉量分布不均、煤粉细度的偏差以及二次风箱风量分配特性等因素共同造成了炉内偏烧。为缓解炉内偏烧，从煤粉细度、燃烧器配风、燃尽风摆角和贴壁风开度等方面进行了调整。试验发现，燃尽风开度和摆角调整对于炉内偏烧的影响最为明显。燃尽风开度减小、燃尽风摆角由中间向两侧摆动有助于缓解偏烧。通过调整，屏过出口汽温偏差由40 ℃降低到10 ℃以内，省煤器出口氧量最低点由调整前的低于1%提高到调整后不低于2%；CO浓度最高点由调整前的5000 μL/L以上降低到调整后的500 μL/L以下，使该机组偏烧问题得到大幅度缓解。

关键词: 侧煤仓, 粉量偏差, 偏烧, 对冲锅炉, 配风调整

Abstract:

An experimental study was carried out on deviant combustion of a 1000 MW opposed firing boiler. It was found that the powder deviation is the main factor. The distributions of powder amount and pulverized coal fineness demonstrated a typical interval distribution trend as well as a positive correlation. The factors such as uneven distribution of powder amount, deviation of pulverized coal fineness and air distribution characteristics of secondary-air-box led to the deviant combustion in the furnace. In order to alleviate the deviant combustion in the furnace, the fineness of pulverized coal, the air distribution of the burner, the swing angle of the burning wind, and the opening of closing-to-wall air were adjusted. It was found that the adjustment of burning wind opening and swing angle have the most significant influence. The decrease of burning wind opening and the swing angle of burning wind from the middle to both sides were helpful to alleviate the deviant combustion. After adjustment, the deviation of steam temperature at screen superheater outlet was reduced from 40 ℃ to less than 10 ℃. Under the full load condition, the lowest point of oxygen concentration at the outlet of the economizer was increased from less than 1% to more than 2%. The highest point of CO concentration decreased from more than 5000 μL/L to less than 500 μL/L. The deviant combustion was greatly alleviated. The combustion adjustment could provide reference for the same type of units to solve the problem of deviant combustion.

Key words: side bunker, powder deviation, deviant combustion, opposed firing boiler, air distribution adjustment

葛铭, 姜志成, 吕智嘉, 王佳杨, 仇召宏, 张守玉. 粉量分布不均对1000 MW机组对冲锅炉的影响及调整[J]. 中国电力, 2024, 57(1): 219-229.

Ming GE, Zhicheng JIANG, Zhijia LV, Jiayang WANG, Zhaohong QIU, Shouyu ZHANG. The Influence of Unevenly Distributed Powder on a 1000 MW Opposed Firing Boiler and the Counter Measures[J]. Electric Power, 2024, 57(1): 219-229.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202304081

https://www.electricpower.com.cn/CN/Y2024/V57/I1/219

图/表 13

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磨煤机	粉量最大偏差/%	煤粉细度R₉₀最大值/%
A磨	+61.0	21.0
B磨	–36.8	26.6
C磨	+26.1	24.4
D磨	+88.4	34.3
E磨	+36.8	33.2
F磨	+26.9	17.6

磨煤机	粉量最大偏差/%	煤粉细度R₉₀最大值/%
A磨	+61.0	21.0
B磨	–36.8	26.6
C磨	+26.1	24.4
D磨	+88.4	34.3
E磨	+36.8	33.2
F磨	+26.9	17.6

各层燃烧器编号	中心风/ mm	外旋风/ mm	摆角/(°)	内二/(°)	外二/(°)
I8	100	100	+20	—	—
I7	100	100	+20	—	—
I6	80	50	+20	—	—
I5	80	50	+20	—	—
I4	50	50	–20	—	—
I3	50	50	–20	—	—
I2	100	100	–20	—	—
I1	100	100	–20	—	—
H8	200	400	—	—	—
H7	200	400	—	—	—
H6	50	100	—	—	—
H5	50	100	—	—	—
H4	50	100	—	—	—
H3	50	100	—	—	—
H2	200	400	—	—	—
H1	200	400	—	—	—
C8	100	—	—	90	75
C7	100	—	—	90	75
C6	100	—	—	40	40
C5	100	—	—	40	40
C4	100	—	—	40	40
C3	100	—	—	40	40
C2	100	—	—	90	75
C1	100	—	—	90	75
B8	100	—	—	90	75
B7	90	—	—	90	75
B6	90	—	—	40	40
B5	90	—	—	40	40
B4	95	—	—	70	60
B3	100	—	—	70	60
B2	100	—	—	90	75
B1	100	—	—	90	75
A8	—	—	—	90	75
A7	—	—	—	90	75
A6	—	—	—	40	40
A5	—	—	—	40	40
A4	—	—	—	40	40
A3	—	—	—	40	40
A2	—	—	—	90	75
A1	—	—	—	90	75

各层燃烧器编号	中心风/ mm	外旋风/ mm	摆角/(°)	内二/(°)	外二/(°)
I8	100	100	+20	—	—
I7	100	100	+20	—	—
I6	80	50	+20	—	—
I5	80	50	+20	—	—
I4	50	50	–20	—	—
I3	50	50	–20	—	—
I2	100	100	–20	—	—
I1	100	100	–20	—	—
H8	200	400	—	—	—
H7	200	400	—	—	—
H6	50	100	—	—	—
H5	50	100	—	—	—
H4	50	100	—	—	—
H3	50	100	—	—	—
H2	200	400	—	—	—
H1	200	400	—	—	—
C8	100	—	—	90	75
C7	100	—	—	90	75
C6	100	—	—	40	40
C5	100	—	—	40	40
C4	100	—	—	40	40
C3	100	—	—	40	40
C2	100	—	—	90	75
C1	100	—	—	90	75
B8	100	—	—	90	75
B7	90	—	—	90	75
B6	90	—	—	40	40
B5	90	—	—	40	40
B4	95	—	—	70	60
B3	100	—	—	70	60
B2	100	—	—	90	75
B1	100	—	—	90	75
A8	—	—	—	90	75
A7	—	—	—	90	75
A6	—	—	—	40	40
A5	—	—	—	40	40
A4	—	—	—	40	40
A3	—	—	—	40	40
A2	—	—	—	90	75
A1	—	—	—	90	75

各层燃烧器编号	中心风/ mm	外旋风/ mm	摆角/(°)	内二/(°)	外二/(°)
K8	100	100	+20	—	—
K7	100	100	+20	—	—
K6	80	50	+20	—	—
K5	80	50	+20	—	—
K4	50	50	–20	—	—
K3	50	50	–20	—	—
K2	100	100	–20	—	—
K1	100	100	–20	—	—
J8	200	400	—	—	—
J7	200	400	—	—	—
J6	50	100	—	—	—
J5	50	100	—	—	—
J4	50	100	—	—	—
J3	50	100	—	—	—
J2	200	400	—	—	—
J1	200	400	—	—	—
F8	100	—	—	90	75
F7	100	—	—	90	75
F6	100	—	—	40	40
F5	100	—	—	40	40
F4	100	—	—	40	40
F3	100	—	—	40	40
F2	100	—	—	90	75
F1	100	—	—	90	75
E8	90	—	—	90	75
E7	90	—	—	90	75
E6	90	—	—	40	40
E5	90	—	—	40	40
E4	100	—	—	40	40
E3	90	—	—	40	40
E2	90	—	—	90	75
E1	100	—	—	90	75
D8	100	—	—	90	75
D7	100	—	—	90	75
D6	100	—	—	40	40
D5	100	—	—	40	40
D4	100	—	—	40	40
D3	100	—	—	40	40
D2	100	—	—	90	75
D1	100	—	—	90	75