Research On PM-VOCs Integrated Removal Device Design And Experimental In The Flue Gas Of Biomass Boiler

As the fourth largest energy source after coal,petroleum,and natural gas,biomass energy has the advantages of clean,environmentally friendly,renewable,and capable of realizing zero emissions of carbon.Our country has abundant straw resources and there is great potential for straw energy utilization.In recent years,China has made considerable progress in energy conversion and utilization technologies such as direct combustion of straw,the straw burning fuel is the most widely used.However,there is a problem of large total emissions of particulates and volatile organic compounds in the energy utilization of straw.This research was based on inquiring about domestic and international aspects of the emission characteristics of flue gas and the technology of flue gas treatment in biomass boilers..It aims at the problems of that current flue gas cleaning devices of small-scale biomass boiler has low research and low efficiency,Through theoretical research,computer simulation,prototyping,and experimental analysis,an integrated removal device for particulate matter and volatile organic compounds in the flue gas of small-scale biomass boilers was developed.The main research contents and innovations are as follows:(1)Study on the process of PM-VOCs integrated removal device.Through consulting literature and experimental tests,the characteristics of the flue gas emission of small-scale biomass boilers were studied to formulate a process that meets the requirements for flue gas purification.According to the obtained smoke emission characteristics,the bag dust removal technology was combined with activated carbon adsorption technology,integrated ventilation and direct cooling technology integrated removal technology,and based on this principle the whole machine design.(2)Research on the design of PM-VOCs integrated removal device.According to the process route,each component was designed,including the condensing system,dust removal system,adsorption system,and fan.(3)Numerical simulation study of PM-VOCs integrated removal device.According to the design of the PM-VOCs integrated removal device model,the internal flow field of the device was numerically simulated and analyzed by Fluent,and the internal flow field distribution was optimized.(4)Experimental study on the PM-VOCs integrated removal device.verification tests for different loads and different fuels,and optimization of process parameters for operating wind speed and temperature during the later period.The test results show that the removal efficiency of the device is 87.8%~90.7%,the removal rate of VOCs is 69.1%~72.0%,and the emission concentration of particulate matter and VOCs is much less than the national standard.The optimal operating parameters of the device are a filtered air velocity of 3m/s and an operating temperature of 50°C.The device achieves the design requirements,and realizes the removal of PM and VOCs from the biomass boiler flue gas.