How to Improve and Implement Biomass Boiler to Increase Convection Heating Surface
2019/5/20 Click：924
How to reform the biomass boiler? Change the position of the partition wall to increase the flue gas velocity of the second convection tube bundle, and change the size before and after. Increase the capacity of sewage discharge, replace the original sewage pipe from A to Hua, and add the sewage pipe of Hua to the middle header. And seal wear, grate clearance increases, resulting in increased coal leakage. The unreasonable arrangement of the furnace arch and the weak effect of strengthening mixing and stirring are not conducive to combustion and improving thermal efficiency. Biomass boilers share a heavy chain wet slag remover, which hardens the moisture absorption of fine ash adsorbed on the tube wall and affects heat transfer due to the high humidity. Dust adsorption aggravates the corrosion of convective tube bundles. The discharge pipe of the header is too thin to discharge the dirt in the header smoothly through the instantaneous pressure difference when discharging the dirt. There is no sewage pipe in the header in the original design, and a sewage pipe is shared with the lower header, so that the dirt in the header can not be discharged, resulting in local heating deformation of the header and bulging.
Due to the adoption of wet dust and slag removal, the water vapor absorption part of flue gas is acidic, which results in the aggravation of suction corrosion of fan, and the cost of rebuilding the boiler with replacement platform is about 10,000 yuan. Boiler replacement table, about 10,000 yuan. It is estimated to invest 10,000 yuan in technological transformation. After repeated demonstration and comparison of economy and feasibility, it is concluded that the former schemes are due to the small space of boiler room, the need to rebuild the structure of biomass boiler, the rebuilding of foundation and the corresponding replacement of supporting equipment, with large investment and long construction period. Finally, the scheme is determined. Considering the time limit, site, capital and other issues, the first half of the boiler is only partially revamped, and the second convection tube bundle with a larger focus is revamped, while the air preheater, grate and arch remain unchanged for the time being.
In view of the problems of low flue gas velocity, easy ash accumulation and low thermal efficiency of the original boiler, biomass boilers are reformed to improve the flue gas velocity as the dominant factor and focus on reducing the flue gas cross-section area. The users of convective tube bundles replace the handsome ones and increase part of the heating surface. The upper and lower headers were changed from Chuan to A, connecting pipes.
Because the central position of the front part of water wall tube, header and air preheater have not been changed, the central position of the lower header of the first row tube bundle in the second convection tube bundle has not changed, and the lower header of the other second convection tube bundles has moved up. In order to solve the problem of ash accumulation on the back arch, a new ash removal door was opened on the side wall, sealed and opened during ash removal.
Due to the adoption of wet dust and slag removal, the water vapor absorption part of flue gas is acidic, which results in the aggravation of suction corrosion of fan, and the cost of rebuilding the boiler with replacement platform is about 10,000 yuan. Boiler replacement table, about 10,000 yuan. It is estimated to invest 10,000 yuan in technological transformation. After repeated demonstration and comparison of economy and feasibility, it is concluded that the former schemes are due to the small space of boiler room, the need to rebuild the structure of biomass boiler, the rebuilding of foundation and the corresponding replacement of supporting equipment, with large investment and long construction period. Finally, the scheme is determined. Considering the time limit, site, capital and other issues, the first half of the boiler is only partially revamped, and the second convection tube bundle with a larger focus is revamped, while the air preheater, grate and arch remain unchanged for the time being.
In view of the problems of low flue gas velocity, easy ash accumulation and low thermal efficiency of the original boiler, biomass boilers are reformed to improve the flue gas velocity as the dominant factor and focus on reducing the flue gas cross-section area. The users of convective tube bundles replace the handsome ones and increase part of the heating surface. The upper and lower headers were changed from Chuan to A, connecting pipes.
Because the central position of the front part of water wall tube, header and air preheater have not been changed, the central position of the lower header of the first row tube bundle in the second convection tube bundle has not changed, and the lower header of the other second convection tube bundles has moved up. In order to solve the problem of ash accumulation on the back arch, a new ash removal door was opened on the side wall, sealed and opened during ash removal.
