Research On Condensation Recovery Technology Of Moisture Gas In Coal-fired Boiler

With the decrease of renewable energy,the importance of energy has been paid more and more attention.China's energy reserve pattern is "rich in coal,poor in oil and little in gas",which determines China's energy pattern dominated by coal for a long time.But the environment situation is declining day by day,energy conservation and emission reduction is also a problem we have to face.Water resources in China are scarce and unevenly distributed,and the importance of water supply to new and existing power plants is increasing,so the cost of industrial water is increasing.The power industry is a big user of water.Thermal power accounts for 40.4% of the total industrial water consumption.Water recovery of flue gas from coal-fired power stations is a hot topic in recent years.Most coal-fired power stations adopt the wet desulfurization technology,and the flue gas still contains a large amount of water after the wet desulfurization,and the volume fraction of water vapor is about 12-16%,which still has great recyclability.In recent years,the water recovery technology of flue gas is mainly divided into three types: cooling and condensation technology,membrane separation technology and liquid absorption technology.The three technologies have their own advantages and disadvantages.This article mainly through constructing light water recycling experiment station flue gas tube heat exchanger and flue gas bubble copper fin heat exchanger water recycling experiment station of the flue gas water recycling water recovery characteristics and heat transfer characteristics was studied,compared two groups of experimental data can be obtained using bubble copper as fin can effectively improve the condensing water yield,the condensing rate and thermal efficiency.The data obtained from the flue gas water recovery experiment of copper foam finned heat exchanger were analyzed,and the experimental correlation of convectioncondensation heat transfer was obtained by multiple regression fitting,and the experimental value and the predicted value were compared,the error was within 6%.Finally,the simulation software FLUENT was used to simulate the copper foam finned heat exchanger,and the axial velocity cloud diagram,flow diagram,axial velocity trend diagram,axial temperature distribution diagram and axial temperature trend diagram on the section of the heat exchanger were obtained.Through the analysis of the simulated data and the comparison with the experimental data,it is concluded that the design of the foamed copper fin heat exchanger is more in line with the actual situation.By comparing the data of simulation and experiment,the error is within the error range.