Research On Smoke Elimination Technology Based On Carbon Steel-fluorine Plastic Heat Pipe Technology

The white smoke may generally appears in chimneys of coal-fired power plants in winter.Reducing the moisture of flue gas can effectively eliminate white smoke,but it is faced with the problem of heating surface.Aiming at a series of problems such as flue gas dehumidification,this paper puts forward a new type of carbon steel-fluorine plastic composite heat pipe and analyzes and studies the flue gas dehumidification system,and puts forward a feasible technical scheme for reducing the moisture of flue gas and improving the energy utilization efficiency of boiler.A new type of carbon steel-fluorine plastic composite heat pipe is proposed as the main heat transfer element for flue gas dehumidification of coal-fired boilers,and the starting performance test and isothermal performance experiment of heat pipe are carried out,which proves that the new heat pipe has good application value.The optimum filling rate of heat pipe under the corresponding working conditions is also explored in this paper.The flue gas characteristics of boiler tail are studied,and the feasibility of applying new heat pipe to flue gas dehumidification is analyzed according to the characteristics of flue gas.For the defects such as the thermal conductivity of fluorine plastics,it is proposed to make up for them by means of small pipe diameter,thin pipe wall and a large number of heat exchanger.The convection heat transfer process with condensation during contact between saturated flue gas and cold wall at a specific temperature is studied,and the relationship between convection heat transfer coefficient and flue gas flow rate,cooling water flow rate,heat pipe spacing and so on is obtained by CFD simulation calculation.On this basis,the design analysis and calculation of the heat exchanger structure are carried out,and the heat transfer performance and structure size of the heat exchanger are finally determined.An economic and environmental benefit assessment of the flue gas dehumidification system is carried out.Through calculation,the system is calculated based on 5,000 operation hours per year,and the annual reduction of water vapor emissions by 470,000 tons to the atmosphere can obviously alleviate the production of white smoke in power plants.According to the relevant literature test report calculation,the system can reduce the reduction of pure Sulfuric acid 18.7 tons annually.