Selection of ultra-low emission transformation scheme for 300MW CFB unit desulphurization system

3rd International Conference on Energy Engineering and Environmental Protection

能源学;生态环境科学

Zhang, Lei^1^2 ; Yuan, Guangcun^1 ; Li, Shuyuan^1

Shenhua Guoneng Shandong Construction Group Co. Ltd, Power and Manchanical Engineering, North China Electric Power University, China^1

School of Energy, Power and Manchanical Engineering, North China Electric Power University, China^2

关键词: Boiler efficiency;    Desulfurization and denitrifications;    Desulphurization;    Desulphurization systems;    Limestone injection;    Material consumption;    Operation and maintenance;    Transformation scheme;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/227/4/042042/pdf
DOI  :  10.1088/1755-1315/227/4/042042

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Mature outside-desulfurization technology is supplied as an ultra-low emission transformation for meeting present emission standard.In order to explore a reasonable method to select the most economical transformation scheme of desulfurization system, a CFB boiler of 300MW class unit was taken as the research object. According to actual operation data and characteristics of different technical routes, a numerical model was set up, in which the cost caused by material consumption in desulfurization and denitrification and change of boiler efficiency was considered. The model was transformed into a single value function of ratio of calcium to sulfur in furnace. Through derivation, optimum proportion of joint desulfurization in and out furnace and comprehensive annual cost including initial investment, operation and maintenance of different schemes were obtained. The results show that for semi-dry desulphurization system outside furnace, the change of ratio of calcium to sulfur outside furnace has little influence on optimum ratio of desulphurization in furnace. When the ratio of calcium to sulfur outside furnace is 1.2∼2.0, optimum ratio of desulfurization in furnace is about 76%∼88%. According to this ratio, the ultra-low emission transformation scheme combining semi-dry desulphurization outside furnace and limestone injection in furnace is the most economical.