Development Of Late-model CWS Gasification Jet Nozzle And Gasifier And Numerical Simulation Of Gasification Process

Coal water slurry (CWS) gasification technique is always highly recognized by international society and our country in recent years. This technique is always listed on sixth, seventh, eighth and ninth five-year project. CWS technique is developed well in China. But, compare with the developed countries, in design and manufacture of burner, manufacture of big capacity high pressure CWS pump, structure configuration of the burner and the gasifier, the development of numerical simulation software, the manufacture of furnace firebrick, the design of PDP software and other sides, our technique is not perfect. In addition, because of the limitation of the patent of Texaco CWS gasification technique, high patent cost will be paid when introducing it. So, developing our own gasification technique of different raw material is necessary.In this paper, some research work was developed on above issue. Three tunnel multi-level inner-mixed CWS gasification burner was developed independently, and a lot of experiments were done. At the same time, the effect of the structure size of burner upon CWS atomization was studied. The structure size of the burner was confirmed by optimization test, and the best atomization effect of the burner was obtained. The influence of the structure size of the burner on atomization effect was confirmed. A new multi-inlet CWS gasifier was developed independently. The effect of different furnace side burner inlet height and angle upon flow field distribution was analyzed by means of numerical simulation, and different kind of flow field distribution and particle concentration of gasification furnace was obtained. Consequently, the best kind burner and furnace structure was confirmed. Furthermore, cold test of above factors on flow field, particle concentration distribution, and pressure distribution was done. Because the numerical simulation is in agreement with the test result, the feasibility of numerical simulation replacing experiment investigation was confirmed. The numerical simulation on gasification process of industrial furnace is applied, and industrial furnace site test was finished too. The result of numerical simulation agrees well with the test result. Accordingly, the reliability and superiority of numerical simulation method was proved. Hot numerical simulation of CWS gasification process on the new furnace was finished using above method. The influences on gasification process and the content of the outlet gas were confirmed by different O2 coal ratio, slurry concentration, gasification pressure, burner inlet angel, different ratio of coal slurry and oxygen. And the distribution of the temperature, the velocity, the pressure, and the concentration distribution of CO, CO2, H2, H2O, CH4, O2 in the furnace were obtained. In addition, the content of the outlet gas was obtained also. These not only provided theory foundation and guidance for design and operation of gasifier, but also a set of complete numerical simulation method for design and reform of gasifier. Numerical simulation of gasification process on coke CWS, oil CWS was finished using above method, which provided theory foundation and guidance for gasification of different raw materials, and a set of simple method for design and development of gasifier of different raw material.In this paper, my research proved the earlier development and the reform of CWS gasifier using numerical simulation method is feasible. A lot of material resources could be saved, and the developing period could be shortened. Furthermore, the theory guidance of gasifier operation was provided.