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Numerical Simulation Of SNCR Process About Pulverized Coal Fired Boiler

Posted on:2016-09-26Degree:MasterType:Thesis
Country:ChinaCandidate:Y GuFull Text:PDF
GTID:2271330470971129Subject:Power engineering
Abstract/Summary:PDF Full Text Request
As the most important electric energy production unit of our country, coal-fired power plants play an important role in both economic development and environmental pollution. In particular, nitrogen oxides from boiler flue gas make a great impact in atmospheric environment so that how to reduce nitrogen oxide emissions becomes the key point of current research. Selective non-catalytic reduction (SNCR) has the advantages of the simple system, short period, low investment, without using expensive catalyst, which fits China’s situation and has been widely used. SNCR denitration technology which can only response between 850~850℃ is greatly influenced by reducing agent, atmosphere and other factors because of its principle of a chemical reduction reaction. That is why we need to study the effect of various factors on the denitration reaction.This paper perform a simulation of a model for the SG2028/17.5-M904 subcritical pressure controlled circulation boiler based on ANSYS 14.0 software and divide the numerical simulation into two parts. The most suitable furnace interval for SNCR reaction can be obtained in the first part of the numerical simulation by studying the flow and combustion inside the furnace and obtaining the temperature distribution based on the modeling for the whole furnace. The second part of the denitration simulation is setting up a model only for SNCR reaction zone and import the SNCR entry condition which derived from the first part to computational domain. This paper introduces the basic principles of selective non-catalytic reduction method, foreign and domestic research overviews about SNCR and the numerical simulation model which is used for the research of boiler combustion and SNCR reaction. By simulating 600MW boiler of a power plant, the denitrification efficiency under different conditions and an analysis of how factors such as temperature, reducing agent inlet influence of jet velocity, ammonia nitrogen ratio, the molar ratio, initial NO content and different nozzle operation influence denitrification reaction efficiency can be derived.
Keywords/Search Tags:pulverized coal fired boiler, nitrogen oxides, selective non-catalytic reduction, numerical simulation, denitration efficiency
PDF Full Text Request
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