Research On Heat Transfer Of Flue Gas Condensing Heat Transfer Equiment Of Thermoelectricity Boiler

With the implementation of the strategy of global response to climate change, especiallyit was written in China’s12th five-year plan for energy development that the key task foroptimizing energy structure was to take effective measures to save energy and increase theutilization ratio of traditional clean energy. Since China mainly relied on import for naturalgas, to increase the utilization ratio of natural gas was not only the answer for energy savingand emission reduction and growing energy needs, it was also of great significance fornational energy security.This essay targeted the smoke waste heat recovery technology and equipment of largenatural gas thermal power equipment. It adopted the method which combines theory study,experimental study and actual engineering experiment. It calculated and analysed the smokeand gas features of the generating electricity system circulately. Studied the heat exchangerflue gas side convective condensation heat transfer law and heat transfer law of flue gas withthe heating medium in the diferent way of direct contact and indirect contact, R&D indirectheat exchanger large gas-steam combined cycle thermoelectric unit flue gas condensing heatrecovery heat exchanger and optimized design scheme. It provided technical support for thedevelopment flue gas condensing heat recovery technology of large gas turbines and otherindustrial gas thermal power equipment.Studied the gas characteristics of gas-steam combined cycle generating unit flue, fluegas dew point temperature, wast heat and energy saving potential of different seasons.Research shows that, the flue gas dew point temperature between38.8°C~42.45°C withseasonal variations; the flue gas temperature dropped from150°C to35°C, saving over16.68%, even dropped from90°C to35°C, saving9.52%at least. If extended to the fourthermoelectric Center of Beijing, energy saving quantity equals to7%of current Beijing’s gasconsumption, and to2%in2015.Based on theoretical analysis and engineering test results, studied the gas-steamcombined cycle thermoelectric unit flue gas convection condensation heat transfer law,derived the flue gas side convective heat transfer coefficient of the flue gas condensing heatrecovery unit under the conditions of the heat exchanger structure. Developped the gas-steamcombined cycle thermoelectric unit flue gas condensing heat recovery heat exchanger andoptimized design scheme.With regard to the natural gas boiler room with different excess air coefficients, it studiesthe application and optimization plan on the flue gas waste heat recovery and completes theengineering design of energy preservation of4boiler rooms and concludes the feasibilitystudy of recovery of flue smoke of2industrial boiler rooms.For dusty flue gas waste heat characteristics, this paper also designed the system of fluegas and water direct contact heat exchanger, built the bench and experiment plan,experimental studied the the regularity of the direct-contact heat exchanger and the flue gas condensing waste heat recovery law, IT provides the basis for industrial natural gas utilizationequipment flue gas condensing waste heat utilization...