Research on Closed Cycle Pipe Blowing Technology of 5 MW Supercritical Carbon Dioxide Unit Boiler

doi:10.12096/j.2096-4528.pgt.21140

Abstract

Abstract:

In order to explore the steam pipe blowing process suitable for new supercritical carbon dioxide boiler, taking a 5 MW supercritical carbon dioxide circulating power generation test unit as the research object, the characteristics of main and auxiliary equipment were analyzed, and a closed circulating blowing scheme was proposed and applied. With the help of the original high and low pressure bypass of the unit, the boiler pipeline system is completely closed, the circulating high-pressure carbon dioxide gas is used to continuously wash the pipe wall, and the impurity particles are captured by the filter screen. The closed circulating pipe blowing scheme has the advantages of simple system and convenient operation. The purging quality has passed the target inspection, which effectively ensures the later commissioning of the test unit. In view of the unit shutdown caused by the frequent blockage of filter screen at the initial stage of scheme implementation, a two-way filter was developed and put into use on site, which can significantly improve the pipe blowing efficiency and reduce the pipe blowing cost. Relevant experience has important engineering reference significance for the infrastructure commissioning of subsequent supercritical carbon dioxide cycle generator units.

Key words: supercritical, carbon dioxide, boiler pipe blowing, closed cycle

CLC Number:

TK 229.2

Lin WANG. Research on Closed Cycle Pipe Blowing Technology of 5 MW Supercritical Carbon Dioxide Unit Boiler[J]. Power Generation Technology, 2023, 44(5): 731-737.

Figures/Tables 7

References 12

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参数	额定工况数值
过热器流量/(t⋅h^-1)	290.4
过热器出口压力/MPa	20
过热器出口温度/℃	600
再热器流量/(t⋅h^-1)	295
再热器进口压力/MPa	15.3
再热器出口压力/MPa	14.7
再热器入口温度/℃	562
再热器出口温度/℃	600
给气温度/℃	476

参数	额定工况数值
过热器流量/(t⋅h^-1)	290.4
过热器出口压力/MPa	20
过热器出口温度/℃	600
再热器流量/(t⋅h^-1)	295
再热器进口压力/MPa	15.3
再热器出口压力/MPa	14.7
再热器入口温度/℃	562
再热器出口温度/℃	600
给气温度/℃	476

参数	正常工况数值	额定工况数值
进口压力/MPa	7.90	7.90
进口温度/℃	35.0	35.0
进口压缩性系数	0.31	0.51
实际进口容积流量/(m³⋅h^-1)	716	1 183
出口压力/MPa	21.50	21.50
出口温度/℃	96.0	118.0
出口压缩性系数	0.480	0.651
转速/(r/min)	8 267	9 130

参数	正常工况数值	额定工况数值
进口压力/MPa	7.90	7.90
进口温度/℃	35.0	35.0
进口压缩性系数	0.31	0.51
实际进口容积流量/(m³⋅h^-1)	716	1 183
出口压力/MPa	21.50	21.50
出口温度/℃	96.0	118.0
出口压缩性系数	0.480	0.651
转速/(r/min)	8 267	9 130

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