Optimization Of Smoke Plume Control System Based On Compression Heat Pump Cooling Desulfurization Circulating Slurry

The saturated wet flue gas of coal-fired after limestone-gypsum wet desulfurization contains a large amount of moisture and waste heat,and if directly discharged,it will not only produce colored plumes,but also cause a large amount of water and waste heat of flue gas.In the context of energy saving,water saving and emission reduction,in order to solve the above problems,all provinces require the treatment of colored plumes and the recovery of moisture and residual heat in the flue gas,the cooling and dehumidification of the flue gas by condensation is the most effective way.Taking the saturated wet flue gas after wet desulfurization of coal-fired boilers as the research object,and the reduction of outlet flue gas temperature and humidity as the research objective,this paper proposes a smoke plume treatment system based on compression heat pump cooling desulfurization cycle slurry,which reduces the exhaust gas temperature and flue gas humidity in depth,and recovers flue gas moisture and residual heat while controlling the smoke plume.In this paper,the saturated wet flue gas after wet desulfurization of coal-fired boilers is taken as the research object,and the reduction of outlet flue gas temperature and humidity is set as the research goal,a smoke plume treatment system based on compression heat pump cooling desulfurization cycle slurry is proposed by using compression heat pump coupled slurry cooling technology,which can recover flue gas moisture and residual heat while controlling smoke plume by deeply reducing exhaust gas temperature and flue gas humidity.In view of the proposed new system,this paper analyzes the formation,treatment and emission diffusion mechanism of plume in detail from the introduction of moisture sources in flue gas,and constructs a flue gas parameter model,an absorption tower and compression heat pump model based on Aspen Plus software,and a plume emission diffusion model based on COMSOL software.Based on this theory,this paper first analyzes the state parameters and waste heat utilization potential of flue gas by using the flue gas parameter model,so as to lay a foundation for the optimization of the smoke plume treatment system.Then,with the purpose of reducing the outlet flue air temperature and humidity,the Aspen Plus model was used to further optimize and analyze the relevant key parameters of the two core equipment of absorption tower and compression heat pump to determine the optimal system configuration and parameter range,and analyze the energy consumption,flue gas waste heat recovery and water saving under the optimal configuration of the system.Finally,the COMSOL software is used to check the flue gas lift height at different exhaust gas temperatures to ensure that the ground pollutant concentration is within a safe range.Based on the above research,a 168 MW coal-fired boiler in Anhui Province is taken as the research object to determined the operation mode and parameters of the system,the smoke exhaust parameters before and after the system transformation are compared,and the economy and environmental protection of the new system are analyzed,which provides reference significance for the application of practical projects in the future.