Prediction on tube wall temperatures of boiler heating surfaces based on artificial intelligence

doi:10.3969/j.issn.2097-0706.2022.03.009

Abstract

Abstract:

In order to accurately predict the wall temperature of a boiler superheater at its outlet, the influencing factors for the heating surface temperature of the supercritical unit are analyzed. Then, according to the gray correlation analysis on the correlation degree between the influencing factors and metal wall temperature through, ten variables with correlation degree over 0.7 are chosen as the training samples. According to the variation characteristics of the data samples from the thermal power plant, through sliding window data judgment, multiple input variables in the extracted stable load sections are clustered to obtain cleaned data samples. The prediction model of the metal wall temperature is constructed through LSTM neural network. Making prediction on the heating surface temperature of a 350 MW supercritical unit, the maximum error between the predicted result and the measured value is 4.9 ℃, which proves the effectiveness of the model.

Key words: AI, LSTM, BP neural network, gray correlation analysis, boiler, superheater, overheating, prediction model

CLC Number:

TK172.4

YAN Xinchun, CAO Huan, HUA Yunpeng. Prediction on tube wall temperatures of boiler heating surfaces based on artificial intelligence[J]. Integrated Intelligent Energy, 2022, 44(3): 58-62.

Figures/Tables 7

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参数	关联度
主蒸汽温度	0.902
主蒸汽流量	0.814
主蒸汽压力	0.790
省煤器入口流量	0.892
省煤器入口温度	0.738
发电机有功功率	0.792
入炉总煤量	0.755
入炉总风量	0.705
一级减温器入口蒸汽温度	0.772
二级减温器入口蒸汽温度	0.790
一级减温器后蒸汽温度	0.605
二级减温器后蒸汽温度	0.625
一级减温水流量	0.621
一级减温水温度	0.582
二级减温水流量	0.669
二级减温水温度	0.682
风煤比	0.455
风水比	0.565
水煤比	0.505

项目			时间（2020年）
项目			06-24 T 02:25—05:59	06-28 T 01:38—05:06	06-29 T 23:17—23:43	07-02 T 02:16—06:48	07-12 T 02:01—08:01	…	07-15 T 20:11—20:19	07-17 T 09:05—09:23	07-17 T 23: 37—18 T 00:03
输入变量	有功功率		175.0	174.1	172.2	178.2	177.1	…	309.2	309.1	176.0
	主蒸汽流量		525.4	524.7	510.1	535.3	532.3	…	960.0	948.4	519.8
	主蒸汽压力		14.1	14.1	14.2	14.3	14.2	…	24.1	24.3	14.3
	主蒸汽温度		562.3	563.4	561.8	563.3	561.3	…	561.2	560.3	564.6
	给水流量		494.3	485.7	479.2	495.2	520.1	…	974.9	944.1	491.1
	给水温度		281.0	280.2	282.1	283.5	277.2	…	305.4	308.9	281.3
	左侧一级喷水	减温前温度	426.6	437.7	462.7	431.6	418.0	…	436.0	448.3	438.5
	左侧一级喷水	减温后温度	412.1	407.7	425.9	411.4	412.7	…	433.8	443.8	418.7
	右侧一级喷水	减温前温度	452.3	448.8	426.0	448.5	431.3	…	445.9	445.0	433.9
	右侧一级喷水	减温后温度	419.0	418.1	415.2	418.5	419.6	…	434.5	435.3	415.1
	左侧二级喷水	减温前温度	482.7	483.7	495.2	483.9	478.0	…	474.7	491.0	489.3
	左侧二级喷水	减温后温度	457.0	449.9	453.7	451.3	459.7	…	463.8	472.8	462.9
	右侧二级喷水	减温前温度	495.3	493.6	484.0	493.7	481.1	…	483.2	482.2	481.5
	右侧二级喷水	减温后温度	458.7	449.8	460.3	452.0	459.7	…	477.6	475.6	450.5
输出变量	末级过热器1307壁温		580.1	579.2	572.1	583.2	574.0	…	568.7	572.6	579.7
输出变量	末级过热器3507壁温		573.6	576.4	581.0	572.9	575.9	…	570.3	567.5	572.7