Experiment on Multi-Component Synchronous Test of Reducing Atmosphere Adjacent to Water Wall of High Temperature Corrosion Boiler

doi:10.12096/j.2096-4528.pgt.23009

Abstract

Abstract:

In order to reveal the correlation between H₂S concentration and the concentration of CO, H₂ and other reducing atmosphere near the water wall of the boiler, a multi-component synchronous test of reducing atmosphere adjacent to water wall was carried out on a 300 MW high temperature corrosion boiler. It is found that when CO volume fraction is between 3.5% and 13%, there is a strong positive correlation between CO concentration and H₂S, H₂ concentration. The correlation is negative between CO concentration and CO₂ concentration. In addition, the positive correlation between CO concentration and H₂S concentration is related to the location of the measuring point. With the increase of furnace height, the positive correlation between the two gradually decreases. In the reducing atmosphere, in addition to CO, a large amount of H₂ is also observed, with the maximum H₂ volume fraction of 4.7%. There is also a strong positive correlation between H₂S concentration and H₂ concentration. Finally, according to the results of synchronous test, the correlation equations between CO concentration and H₂S, H₂ concentration were given respectively, which could be used as a reference for operators.

Key words: boiler, high temperature corrosion, low-NO _x retrofit, reducing atmosphere, water wall

CLC Number:

TK 22

Xiaohe XIONG, Falin CHEN, Renhui RUAN, Houzhang TAN, Yansen LI. Experiment on Multi-Component Synchronous Test of Reducing Atmosphere Adjacent to Water Wall of High Temperature Corrosion Boiler[J]. Power Generation Technology, 2023, 44(6): 800-808.

Figures/Tables 7

Fig. 1 System diagram of field test

Fig. 2 Morphology comparison of lead acetate paper bags before and after reaction

Tab. 1 Average value of coal quality data during the test period

参数	数值
全水分质量分数M_t/%	6.79
空干基灰分质量分数A_adt/%	29.75
干燥无灰基挥发分质量分数V_daft/%	15.67
干燥基固定碳质量分数 $F C D$ /%	58.3
收到基全硫质量分数S_t,art/%	1.78
空干基低位热值Q_net,adt/(MJ/kg)	21.51

Tab. 1 Average value of coal quality data during the test period

参数	数值
全水分质量分数M_t/%	6.79
空干基灰分质量分数A_adt/%	29.75
干燥无灰基挥发分质量分数V_daft/%	15.67
干燥基固定碳质量分数 $F C D$ /%	58.3
收到基全硫质量分数S_t,art/%	1.78
空干基低位热值Q_net,adt/(MJ/kg)	21.51

Fig. 3 Comparison results of H2S and CO test by air extraction of two materials

Fig. 4 Real-time measurement results of atmosphere field at three different height platforms

Fig. 5 Schematic diagram of H2S and CO sources at the measuring point

Fig. 6 Concentration correlation curves between H2S and CO, H2

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