Research On Oxy-Fuel Combustion Power Station With Direct Contact Flue Gas Condenser System

CO2 emission is a big threat to our environment, which is the most important reason for the grave situation of the greenhouse effect. Oxy-fuel combustion technology is one of the important CCUS technologies,for oxy-fuel combustion power plant, the flue gas condenser is important and necessary. Good design is very significant for the investment, operation and maintaining cost, it provides a good working condition and extends the service life of the equipment. Two types of flue gas condensers can be used, the surface and the direct contact condenser(DCC). For the DCC design theory, it is still at the research stage.In this thesis a simple internals direct contact condenser is used for experiments in the 35 MW oxy-fuel combustion power plant, and data is collected for flue gas volume fraction, including flue gas temperature change, cooling water temperature change, gauge pressure. This method is found to be feasible and a part of water vapor is condensed, the condensation rate of this DCC is 37.8%. By this data, numerical calculation is carried on using FLUENT to build models with the same heat transfer effect, and using FLUENT with the same data, the condensation rate is 36%, error rate is only 4.8%.Then some data is changed to test heat transfer effect, some conclusion could be draw: lowering the initial cooling water temperature or increasing cooling water injection angle within limits could improve the condensation rate; the cooling water amount of DCC could use the recommended empirical formula using in the direct contact heat exchanger.Some valuable conclusions are obtained, which can guide the construction of the flue gas condenser in oxy-fuel power plants in the future.