Flow Model Test And CFD Numerical Calculation Study For Flue Gas SCR Reactor Of Coal-Fired Power Plant

Nowadays, China still depends on coal as the main preliminary energy, the gas produced by combustion of the coal contains much contamination, such as: dust, SOX, NOX and CO2, etc... The contamination ejects directly into the atmosphere, and has brought serious environment problem. This is the important problem for our economy sustainable development and we need to solve it urgently. Saving energy and reducing emission are our key tasks during'the Eleventh five-year'and will keep for a long time after. Since 2005, the DeSOX market has been coming into an index increasing period for coal-fired power plant, a lot of newly-built and retrofit power plants need to install SCR (Selective Catalytic Reduction) reactor.SCR is the widely adopted technology for flue gas DeNOX, sharing approx. 90% of the whole market. This paper particularly introduces the actuality of NOX emission and control both for home and other countries, and also introduces the basic application principle of SCR technology.At present, our coal-fired power plants'NOX emission account for more than 60% of the total emission of the country, so it becomes very critical to reduce the emission from coal-fired power plants. In real projects application, the flue gas velocity and the ammonia concentration distribution at the inlet of the first catalyst layer in SCR reactor impact the operation efficiency of the whole system. Usually during the process design, FMT (Flow Model Test) and CFD (Computational Fluid Dynamics) should be studied and calculated, so as to guarantee the flue gas velocity and the ammonia concentration distribution at the entrance of the first layer of catalyst in SCR reactor. But now, this kind of research is mainly provided by overseas suppliers, which costs much, and it also does not avail for us to master the key cores of SCR DeNOx system. For Song Yu SCR reactor, we built a 1/12 scale physical model, and completed the test under the cool condition. At the same time, we studied the CFD calculation, through various schemes calculation and analysis we got the final optimization design. The conclusions between CFD calculation and FMT match very well, providing the theory evidence and the possible solutions for the final optimization design, thus ensure the maximum operating efficiency of the SCR while minimizing the pressure losses and preventing dust accumulation. A lot of SCR reactors are just under erection, but relative design standards are still short. Certainly, it shows a great importance to establish a series of regulations for CFD and FMT studies of SCR reactor.Finally, this paper summarizes some essential points in the structure optimization design for SCR DeNOx Reactor. Regarding to some issues existing in the FMT and CFD simulating for SCR reactor, this paper presents some key points based on the example.