The Feasibility Analysis of Applying SCR Technology to Regenerative Combustion System

2012 ◽  
Vol 610-613 ◽  
pp. 1747-1750
Author(s):  
Zhong Jun Tian ◽  
Shi Ping Jin ◽  
Tan Li ◽  
Zhen Biao Hao ◽  
Wu Qi Wen
Keyword(s):  
Flue Gas ◽  
Waste Heat ◽  
Catalytic Reduction ◽  
Catalytic Reactions ◽  
Feasibility Analysis ◽  
Combustion System ◽  
Combustion Technology ◽  
Temperature Window ◽  
Regenerative Cells ◽  
Industrial Heating

The regenerative combustion technology has been widely used in the recovery of flue gas waste heat, but the denitration is not considered. This article is based on the comprehensive application of the Selective Catalytic Reduction(SCR) technology and the regenerative combustion technology to recycling waste heat and removing NOx from flue gas. In many industrial heating processes, the temperature of flue gas falls from above 1000°C to the ambient temperature (50°C-100°C) along regenerators, while the temperature window of most catalysts ranges from 200°C to 450°C, meanwhile catalysts and regenerative cells are porous mediums, so the regenerative cells that hold a temperature range for catalytic reactions can be replaced by catalysts, and the waste heat of flue gas can be recovered and the nitrogen oxides can be removed simultaneously.

The Discharge Status and Technical Analysis of NOX of Thermal Power Plant Boiler

2014 ◽  
Vol 535 ◽  
pp. 131-134 ◽  
Author(s):  
Dong Yang ◽  
Qing Wen Chen
Keyword(s):  
Power Plant ◽  
Flue Gas ◽  
Thermal Power Plant ◽  
Catalytic Reduction ◽  
Thermal Power ◽  
Combustion Technology ◽  
Discharge Status ◽  
Low Nox Combustion ◽  
Plant Boiler ◽  
Flue Gas Denitrification

NOXis one of the pollutants which will be key governanced by Government in Twelfth Five, and thermal power plant boiler is the main source of NOXin the atmospheric. Overview of the discharge status of NOXand the state-controlled status of the power plant NOXdischarge regulations with the latest standards, analysis of the current two thermal power plant NOXcontrol technology: low-NOx combustion technology and flue gas denitrification technology. Low NOx combustion technology introduces low excess air combustion technology, air staged combustion technology, flue gas recirculation technology, flue gas denitrification technology introduced four methods which is selective catalytic reduction, selective non-catalytic reduction, hybrid SNCR-SCR catalyst reduction combined metgod and wet NOXabsorption system, principle of denitration and their advantages and disadvantages of different methods are discussed. Finally a brief introduction of the difficulties of governance NOXand some necessary issues when select zhe control methods.

The Preparation and Current Situation of Ce and Mn Catalyst

2013 ◽  
Vol 864-867 ◽  
pp. 1612-1615
Author(s):  
Wen Long Zhen ◽  
Rui Tang Guo ◽  
Wei Guo Pan ◽  
Yan Wu Gao ◽  
Chao Lin Shi
Keyword(s):  
Flue Gas ◽  
Power Plants ◽  
Catalytic Reduction ◽  
Reduction Process ◽  
Air Pollutant ◽  
Photochemical Smog ◽  
Environmental Friendly ◽  
Secondary Pollution ◽  
Temperature Window ◽  
Low Temperature Scr

NOx is the main air pollutant of coal-fired power plants, which is one of the important reasons to cause pollution such as acid rain, photochemical smog and so on. Selective catalytic reduction process is the major technology for reducing NOx emissions from coal-fired power plants. However, the commercial vanaidia-based catalyst is active within a narrow temperature window of 300-400°C, easily to be deacticed by SO2 in the flue gas. And the formation of N2O and toxicity of vanaidia cause secondary pollution. Therefore, it is of more importance to develop a new environmental-friendly catalyst for low temperature SCR with high activity.

scholarly journals Feasibility Analysis of Drying Sludge Using Flue Gas Waste Heat

2019 ◽  
Author(s):  
Bin Wang ◽  
Jinshan Wang ◽  
Hailong Li ◽  
Eva Thorin ◽  
Sebastian Schwede
Keyword(s):  
Flue Gas ◽  
Waste Heat ◽  
Feasibility Analysis

scholarly journals Application and design of an economizer for waste heat recovery in a cogeneration plant

2016 ◽  
Vol 20 (4) ◽  
pp. 1355-1362
Author(s):  
Igor Martic ◽  
Stevan Budimir ◽  
Nenad Mitrovic ◽  
Aleksandar Maslarevic ◽  
Milos Markovic
Keyword(s):  
Flue Gas ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Energy Use ◽  
Waste Heat ◽  
Cogeneration Plant ◽  
Waste Energy ◽  
Effective Use ◽  
Industrial Heating

Energy increase cost has required its more effective use. However, many industrial heating processes generate waste energy. Use of waste-heat recovery systems decreases energy consumption. This paper presents case study of waste heat recovering of the exhaust flue gas in a 1415 kWe cogeneration plant. This waste heat can be recovered by installing an economizer to heat the condensed and fresh water in thermal degasification unit and reduce steam use for maintaining the temperature of 105?C for oxygen removal. Design methodology of economizer is presented.

Cost Control of 600 MW Coal-Fired Units Denitration Based on LCA

2013 ◽  
Vol 864-867 ◽  
pp. 357-360
Author(s):  
Wen Huan Wang ◽  
Wei Guo Pan ◽  
Guo Xin Hu
Keyword(s):  
Life Cycle ◽  
Flue Gas ◽  
Life Cycle Analysis ◽  
Evaluation Method ◽  
Catalytic Reduction ◽  
Gas Concentration ◽  
Combustion Technology ◽  
Low Nox Combustion ◽  
Construction Operation ◽  
The Cost

Life cycle analysis combined with technical economic evaluation method in the paper to control the cost of denitration. A simple model for denitration cost is developed. The influence of different flue gas concentration of NOx to the cost of unit denitration is analysed by life cycle analysis, includes construction, operation and decommissioning, which based on 600 MW coal-fired units. Preliminary calculations reveal that comparing with directly using the denitration technology of selective catalytic reduction (SCR), after using Air staged Low NOx Combustion Technology reduced NOx below 400mg/m3, using SCR denitration further decreased the concentration of NOx in flue gas to 100mg/m3 can save more than 44% of the general denitration cost. This can improve effectively the environmental protection and economy of the coal-fired unit.

The Experimental Investigation on the Internal Temperature Field of Regenerative Burners

2013 ◽  
Vol 291-294 ◽  
pp. 1723-1727
Author(s):  
Zhong Jun Tian ◽  
Shi Ping Jin ◽  
Yu Ming Liang ◽  
Kui Tian ◽  
Zhen Biao Hao ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Experimental Investigation ◽  
Temperature Field ◽  
Flue Gas ◽  
Industrial Furnace ◽  
Internal Temperature ◽  
Heating Curve ◽  
Combustion Technology ◽  
Regenerative Cells

The application of regenerative combustion technology to industry burners has been a huge success. This paper presents an experimental study on the change of the temperature field and the concentration of NO in the flue gas in an industrial furnace. The result showed that the concentration of NO increased with the rise of temperature. For the reversing time of 20s, 40s, 60s, and 80s, the temperature of each point changed in accordance with similar rules, but the temperature of the former three measuring points did not obviously change. The heat transfer occured mainly in the last two layers of the regenerative cells, and the utilization of all the regenerators was only 40 percent. The heating curve of the sixth measuring points was significantly different from the cooling one. With the increase of the reversing time, the flue gas and the air temperature variation also increased.

scholarly journals An Experimental Investigation of Water Vapor Condensation from Biofuel Flue Gas in a Model of Condenser, (1) Base Case: Local Heat Transfer without Water Injection

Processes ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 844
Author(s):  
Robertas Poškas ◽  
Arūnas Sirvydas ◽  
Vladislavas Kulkovas ◽  
Povilas Poškas
Keyword(s):  
Heat Transfer ◽  
Water Vapor ◽  
Flue Gas ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Water Injection ◽  
Vapor Condensation ◽  
Base Case ◽  
Water Vapor Condensation ◽  
Condensing Heat Exchanger

Waste heat recovery from flue gas based on water vapor condensation is an important issue as the waste heat recovery significantly increases the efficiency of the thermal power units. General principles for designing of this type of heat exchangers are known rather well; however, investigations of the local characteristics necessary for the optimization of those heat exchangers are very limited. Investigations of water vapor condensation from biofuel flue gas in the model of a vertical condensing heat exchanger were performed without and with water injection into a calorimetric tube. During the base-case investigations, no water was injected into the calorimetric tube. The results showed that the humidity and the temperature of inlet flue gas have a significant effect on the local and average heat transfer. For some regimes, the initial part of the condensing heat exchanger was not effective in terms of heat transfer because there the flue gas was cooled by convection until its temperature reached the dew point temperature. The results also showed that, at higher Reynolds numbers, there was an increase in the length of the convection prevailing region. After that region, a sudden increase was observed in heat transfer due to water vapor condensation.

Selective catalytic reduction of NO by Co-Mn based nanocatalysts

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Vahid Zabihi ◽  
Mohammad Hasan Eikani ◽  
Mehdi Ardjmand ◽  
Seyed Mahdi Latifi ◽  
Alireza Salehirad
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Energy Dispersive ◽  
Diffraction Field ◽  
X Ray Diffraction ◽  
X Ray ◽  
Analysis Techniques ◽  
Acidic Sites ◽  
Temperature Window ◽  
Temperature Programmed

Abstract One of the most significant aspects in selective catalytic reduction (SCR) of nitrogen oxides (NOx) is developing suitable catalysts by which the process occurs in a favorable way. At the present work SCR reaction by ammonia (NH3-SCR) was conducted using Co-Mn spinel and its composite with Fe-Mn spinel, as nanocatalysts. The nanocatalysts were fabricated through liquid routes and then their physicochemical properties such as phase composition, degree of agglomeration, particle size distribution, specific surface area and also surface acidic sites have been investigated by X-ray diffraction, Field Emission Scanning Electron Microscope, Energy-dispersive X-ray spectroscopy, energy dispersive spectroscopy mapping, Brunauer–Emmett–Teller, temperature-programmed reduction (H2-TPR) and temperature-programmed desorption of ammonia (NH3-TPD) analysis techniques. The catalytic activity tests in a temperature window of 150–400 °C and gas hourly space velocities of 10,000, 18,000 and 30,000 h−1 revealed that almost in all studied conditions, CoMn2O4/FeMn2O4 nanocomposite exhibited better performance in SCR reaction than CoMn2O4 spinel.

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