In the article the flow field in the twin-tangential annular flow gas distributor was simulated based on the standard k-ε turbulent model with FLUENT software according to various distance L between sleeve and column wall and differing numbers of baffles, after comprehensively analyzing, got the best technological parameters with misdistribution factor and pressure drop. Based on the analysis of the flow field discipline of the twin-tangential annular flow gas distributor and the two-line vane gas distributor, and the systematic comparison of the performance of these two kinds of gas distributors in the flue gas CO2 absorption column, the research will provide the important theoretical foundation for the choosing and designing of the distributor of the flue gas CO2 absorber.

In this paper, the model of low temperature fractionation CO2 capturing process is established with HYSYS to carry out the simulation of the process. According to the simulation results, it is concluded that as the CO2 content in the feed gas raises, the CO2 product purity increases and the cooling energy cost of the system decreases. As the CO2 product purity rises, the cooling energy cost increases more and more rapidly. According to the 91.0% CO2 content feed gas, the optimized fractionation pressure is 3.1MPa and the corresponding liquefaction temperature and condensing temperature is-20°C and-24°C respectively.

Nozzle plays an important role in steam turbine design and operation. With the purpose of design a new type low pressure saturated steam turbine, in this paper the model of steam flow inner nozzle was simulated, and the influences of tip angle, expansion section length and throat length on the efficiency of the nozzle were analyzed. Furthermore, the structure and parameter of nozzle were optimized.