Environmental And Technical Economic Analysis On The Flue Gas Denitration Process In Weihuliang Power Plant Of Urumqi

Along with the fast socioeconomic development in our country the conflict betweenenvironmental protection and increase of pollutant emission is becoming increasingly prominent.For realizing sustainable domestic economic and environmental development, Ministry ofEnvironmental Protection has recently issued higher requirements on the pollutant emissions fromcoal-firing power plants. In order to adapt the new requirements, China Power Weihuliang PowerPlant in Urumqi decided to conduct a technical renovation project for denitration of flue gasgenerated from its coal-firing boilers. This paper, through comparing the advantages anddisadvantages amongst the international and domestic denitration processes in combination of theoperational realities of the boilers in Weihuliang Power Plant, works out a suitable technicalrenovation plan based on comprehensive benefits analysis in technical, economic, social andenvironmental dimensions.The main contents include:1. The major domestic and abroad denitration processes were reviewed and a suitabletechnical renovation plan for the power plant was selected based on the analysis of theiradvantages and disadvantages as well as the practical realities.2. SNCR, SCR technology and the selection of composite additives were demonstrated.And the techno-economic, environmental and social benefits after the real technicalrenovation project were analyzed.3. The thermal and velocity distributions of the flue gas, SNCR flow field, and the systemresistance etc. were measured.4. The NOx concentration could be decreased from current700mg/Nm3to100mg/Nm3with a total removal rate of85.7%by applying the selected process of low NOxcombusion+SNCR+composite additives, which could satisfy the requirement of100mg/Nm3emission standard in “Atmospheric Pollutant Emission Standard ofThermal Power Plant”(GB13223－2011) formally been enacted in January1,2012.5. Furthermore, the removal rates of sulfur, nitrates and mercury could be increased byover10%,40%and around30%respectively through input of composite additives.Meanwhile, the absorption tower liquid and gypsum quality remain stable without anyother side effects.Such theoretically analyzed and practically verified denitration process and its technicalparameters could be very potentially extended to other similar thermal power plants.