摘要
掺烧污泥已成为燃煤电厂能源结构转型的手段之一。本文基于浙江金华宁能热电厂现有燃煤烟气系统,提出在烟道系统增设活性炭喷射净化技术,基于Fluent模拟分析,从单喷口和多喷口的喷射点位置、喷射角度、喷射质量流量三个方面,对烟道中活性炭喷射分布均匀性等进行了数值模拟分析;并通过比较停留时间、扩散效果,分析了不同活性炭喷射方案下的喷射效果;最后,对活性炭喷射系统应用于烟气治理领域的影响及安全性进行了分析。结果表明,相对于单喷口喷射,多喷口喷射的活性炭更加均匀,但成本更高。对于单喷口喷射,当活性炭喷射点位置在烟道水平转垂直的弯头出口截面中心位置处时,扩散效果好,且活性炭停留时间长;当活性炭为顺流喷射、质量流量为10 kg/h时具有最高的经济效益。对于多喷口喷射,活性炭质量流量为15 kg/h时,活性炭吸附效果较好,但是成本更高。单喷口和多喷口下都应选择顺流喷射,这样扩散面积相对更大,活性炭的扩散效果相对更好,并且在截面中分布相对均匀。活性炭喷射系统应用于烟气治理领域对环境的影响较小,且安全性在可控范围内。
Sludge blending has become one of the means to transform the energy structure of coal-fired power plants.Based on the existing coal-fired flue gas system of Zhejiang Jinhua Ningneng Thermal Power Plant,this paper proposed to add activated carbon injection purification technology in the flue gas system.Based on Fluent simulation and analysis,the numerical simulation analysis of the uniformity of the spray distribution of activated carbon in the flue gas was conducted from three aspects,such as the position of the spray point of single and multiple holes,the spray angle,and the mass flow rate of the spray,and the impact and safety of the activated carbon spraying system applied in the field of flue gas treatment were analyzed.The results showed that compared with single-nozzle injection,multi-nozzle injection could make the activated carbon distribution more uniform,but the cost was higher.For single-nozzle spraying,when the location of the spraying point was at the centre of the section from the horizontal elbow to the exit of the vertical elbow,the diffusion effect was good and the activated carbon had a long retention time.The economic efficiency was the highest when the spraying angle was selected to be parallel to the flue gas flow and the mass flow rate was selected to be 10 kg/h.For multiple-nozzle spraying,the adsorption effect of the activated carbon was better when the mass flow rate was selected to be 15 kg/h,but the cost was higher.Whether it is single-nozzle injection or multi-nozzle injection,parallel flue gas flow was chosen as the angle of activated carbon injection,in which the diffusion area was relatively large,the diffusion effect of activated carbon was relatively good,and the distribution was relatively uniform in the cross-section.The application of activated carbon injection system in the field of flue gas treatment has less impact on the environment and the safety is within the controllable range.
作者
袁世震
郭倩倩
卢如飞
邓凯
陈颖泉
曹操
胡艳军
YUAN Shizhen;GUO Qianqian;LU Rufei;DENG Kai;CHEN Yingquan;CAO Cao;HU Yanjun(Jinhua Ningneng Thermal Power Company Limited,Jinhua 321000,China;Institute of Energy and Power Engineering,Zhejiang University of Technology,Hangzhou 310023,China)
出处
《能源环境保护》
2023年第6期89-100,共12页
Energy Environmental Protection
基金
浙江省“尖兵”“领雁”研发攻关计划资助项目(2022C03092)。
关键词
燃煤
污泥
活性炭
烟气净化
数值模拟
Coal-fired
Sludge
Activated charcoal
Flue gas purification
Numerical simulation
