Simulation Of Texaco Coal-water Slurry Gasification Process

Coal is the critical material for industrial production in our country, and it occupies a larger proportion in total energy consumption. Vigorously developing the clean coal technology has a profound historical significance in national energy security, fundamentally solving the problem of environmental pollution and promoting the development of the national economy fast and efficient. Coal gasification technology is an important part of the Coal clean conversion technology. It has not only enhanced the efficient and clean use of coal,but also reduced the pollution. So, Simulation of coal gasification has a great practical significance. The minimum of Gibbs free energy is applied to Texaco coal-water slurry gasification process using Aspen Plus. The model is verified by the industrial operating data,and it shows good performance. Based on the model, analysis of key parameters to the syngas and water/vapor ration of outlet syngas is carried out. Additional, the influence of key parameters to the waste water is studied. Finally, by adjusting the ratio of O2/coal and the concentration of coal-water slurry, the gasification process operating line is established and it has a strong significance. The results are: under the current operating conditions, increasing the concentration of coal-water slurry、reaction temperature and the purity of oxygen will promote the effective gas fraction. The water/vapor ration of outlet syngas would increase with rising condensate temperature or inlet raw gas temperature and flow rate. Decreasing the condensing flow rate and the concentration of coal-water slurry will benefit the water usage. It can achieve the goal of energy conservation and emissions reduction.