Optimization and influence factors analysis of auxiliary system waste heat utilization process for oxy-fuel combustion power generation unit

被引：0

作者：

Gao D. ^{[1
,2
]}

Chen H. ^{[2
]}

Ran P. ^{[2
]}

Xu X. ^{[2
]}

Li J. ^{[2
]}

Lu X. ^{[2
]}

机构：

[1] Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology, North China Electric Power University, Baoding

[2] Department of Power Engineering, North China Electric Power University, Baoding

来源：

Zhongguo Kexue Jishu Kexue/Scientia Sinica Technologica | 2024年 / 54卷 / 05期

关键词：

auxiliary system; oxy-fuel combustion; process optimization; steam turbine regeneration system; waste heat utilization;

D O I：

10.1360/SST-2023-0211

中图分类号：

学科分类号：

摘要：

Based on the idea of multi-system integration and heat coupling, combined with the energy level optimal matching principle, the flow adjustable waste heat cascade utilization scheme of the auxiliary system with series and parallel mixed structure is designed for the oxy-fuel combustion power generator unit. Using the analysis and calculation method of efficiency-number of heat transfer unit (e-NTU), the calculation formula of interstage cooler outlet exit gas and condensed water temperature is derived. Based on the characteristic parameters of the internal heat transfer process of the steam turbine regeneration system, the heat-power conversion coefficient matrix equation of the steam turbine regeneration system is built, and the calculation model of power generation increment in the auxiliary system waste heat utilization process is established on this basis, which can quantitatively calculate the impact of the waste heat utilization process on the unit power generation. Taking a 350 MW oxy-fuel combustion simulation power generation unit as an example, overall considering the influence of the waste heat utilization process of the auxiliary system on the auxiliary system operation energy consumption and power generation of the unit, and setting the maximum net increment of generation power as the optimization objective, the optimal value of condensate water flow during the waste heat utilization process is determined. After optimization, the power generation net increment of the oxy-fuel combustion power generation unit increases by 7.09 MW, the power supply standard coal consumption decreases by 11.68 g/(kW h), and the power supply efficiency increases by 1.68%. Moreover, the effect of the unit load variation and different kinds of coal on the auxiliary system waste heat utilization process is further analyzed. © 2024 Chinese Academy of Sciences. All rights reserved.

引用

页码：820 / 834

页数：14

共 26 条

[1]

Guo J J, Zhang T, Li P F, Et al., Industrial demonstration progress and trend in pulverized coal oxy-fuel combustion in China, Proc CSEE, 41, pp. 1197-1208, (2021)

[2]

Vladimir K, Andrey R, Evgeny L, Et al., Techno-economic analysis of the oxy-fuel combustion power cycles with near-zero emissions, Energies, 14, pp. 5358-5379, (2021)

[3]

Wilberforce T, Baroutaji A, Soudan B, Et al., Outlook of carbon capture technology and challenges, Sci Total Environ, 657, pp. 56-72, (2019)

[4]

Chen H, Qi S, Zhang J., Towards carbon neutrality with Chinese characteristics: From an integrated perspective of economic growthequityenvironment, Appl Energy, 324, (2022)

[5]

Li Z, Zhang D J, Pan L Y, Et al., Low-carbon transition of China’s energy sector and suggestions with the “carbon-peak and carbon-neutrality” target (in Chinese), J Chin Soc Power Eng, 41, pp. 905-909, (2021)

[6]

Huang Z, Xie X M., Energy revolution under vision of carbon neutrality (in Chinese), Bull Chin Acad Sci, 36, pp. 1010-1018, (2021)

[7]

Gao D M, Chen H W, Yang J M, Et al., Influence factor analysis of multi-stage air compressor operation energy consumption and economy in cryogenic air separation system for oxy-fuel combustion (in Chinese), J Chin Soc Power Eng, 39, pp. 492-497, (2019)

[8]

Wu H B, Wu J H, Li Y B, Et al., Study on the key technology of CO<sub>2</sub> compression and purification in oxy-fuel combustion coal-fired power plant, Energy Fuels, 33, pp. 3349-3356, (2019)

[9]

Gao D M, Chen H W, Yang J M, Et al., Influence factor analysis of circulating fluidized bed boiler oxy-fuel combustion and CO<sub>2</sub> capture power generation unit operation energy consumption, Proc CSEE, 39, pp. 1387-1396, (2019)

[10]

Rong Y Y M, Wu Q X, Zhou X, Et al., Research on optimization of self-utilization performance of air compression waste heat in air separation system (in Chinese), CIESC J, 72, pp. 1654-1666, (2021)

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