A Study In Design And Performance Analysis Of The Chemical Regenerator

The chemical regenerative gas turbine (CRGT) cycle which has many virtues, such as environmental protection, high efficiency and so on, is a very promising research direction. This kind of cycle has a kernel component, which is the heat regenerator. It plays a vital role during the advanced circulation:not only is the recovery of the waste heat, the reforming reaction of fuel and steam also takes place in this regenerator. Therefore, it is important to carry out the program design and overall performance research for this part. This paper is to find a suitable design method for the chemical heat exchanger, then analyze the overall performance of the component. Throughout the study, the main research methods used are numerical simulation, programming and simulation.Firstly, the method of numerical simulation was used for calculating a single finned tube. It was mainly to simulate the heat transfer in different operating conditions by software of FLUENT, then to find the relationships between the heat transfer and physical parameters. The ultimate goal was to obtain the heat transfer criteria correlation.Secondly, for the steam reforming reaction (in this paper, the pre-conversion was used to promote the reaction), a complete mathematical model of catalytic reforming was established by theoretical calculation and thermodynamic analysis. On this basis, the work process of the regenerator was calculated by the assembly language of MATLAB. To minimize the error caused by linearization method and to improve the accuracy of calculation, the model was not linear, but rather programming the nonlinear equations directly.Finally, after determining the structure of the regenerator, the overall performance was simulated by the simulink simulation tool. Mainly to examine how temperature and flow rate of the internal and external fluid affected the equilibrium composition and the export parameters. And in order to lay the foundation for the best conversion rate, the paper also analyzed the changes of the methane conversion and hydrogen production.It was the first time to propose the design method of the chemical heat exchanger. That was the numerical simulation of the heat transfer and the calculation of the overall with programming. This method proposed was benefit for the rational design of the chemical regenerator. In addition, the following conclusions were obtained by simulation analysis of the regenerator:Under certain conditions, increasing the heat of exhaust gas and the inlet temperature of the fuel would improve the degree of catalytic reforming reaction; but increasing the fuel flow and gas flow would reduce the degree. Performance analysis of the component would make us understand its process better, and provide a reference for setting the process parameters.