Research On Using Design And Simulation 1000MW Coal-fired Power Generating Units Of The Flue Gas Denitration Device

With the implementation of the latest revision of the GB13223-2011 "Thermal power plant air pollutant emission standards" in 2011, emission standards of nitrogen oxide for coal-fired power plants is increasing. With the rapid development of China’s economy, the demand for electricity and environmental standards is increasing. The market prospect of flue gas denitrification technology is huge. Selective catalytic reduction(SCR) in current and future period of time, is still the most important denitrification technology on the international market.This paper summarizes several denitration processes in the world at present, with advantages and disadvantages. This paper focuses on three kinds of SCR denitration layout scheme, several commonly used catalysts and principle of catalyst poisoning, summing up catalyst regeneration and the processing method.In this paper, the practical application of SCR in a 1000 MW coal-fired power plant as the goal. Designing the SCR device and optimizing smoke flow field is the research.SCR device is conducted mathematical modeling by analysising the process characteristics of SCR systems, reaction mechanism, the design principles of main equipment. Based on mathematical model and combined with practical application experience, we can calculate the SCR reactor, the specific design of the catalyst and ammonia system. According to the design plan, we can draw floor plan of SCR system, flue gas denitrification device structure figure, ammonia and other floorplan drawings.Based on Fluent simulation software, this paper optimizes and analyzes the velocity distribution of the flow field in the denitration system. Disposed in the reactor of the three corners flue deflector and above the rectification grid of the reactor, velocity distribution coefficient of flue gas variation is less than 15%. After optimization, it meets with the optimization criteria. This paper basically achieved the desired design requirements, and provides a frame of reference for further study of the SCR system to optimize the design and operation.