scholarly journals The application of RANS CFD for design of SNCR technology for a pulverized coal-fired boiler

2017 ◽  
Vol 19 (2) ◽  
pp. 101-106
Author(s):  
Monika Ruszak ◽  
Marek Inger ◽  
Marcin Wilk ◽  
Jan Nieścioruk ◽  
Magdalena Saramok ◽  
...  
Keyword(s):  
Combustion Chamber ◽  
Pilot Plant ◽  
Pulverized Coal ◽  
Primary Methods ◽  
Reduction Of No ◽  
Emission Abatement ◽  
Emission Standards ◽  
Temperature Window ◽  
Design And Construction

Abstract The article describes the technology of NOx emission abatement by SNCR method. The scope of research included CDF simulations as well as design and construction of the pilot plant and tests of NOx reduction by urea in the plant located in industrial pulverized-coal fired boiler. The key step of research was to determine the appropriate temperature window for the SNCR process. The proposed solution of the location of injection lances in the combustion chamber enabled to achieve over a 30% reduction of NOx. It is possible to achieve higher effectiveness of the proposed SNCR technology and meet the required emission standards via providing prior reduction of NOx to the level of 350 mg/um3 using the primary methods.

A pilot plant for the removal of cationic fission products from milk: I. Design and construction

1968 ◽  
Vol 35 (2) ◽  
pp. 257-268 ◽  
Author(s):  
R. F. Glascock ◽  
H. S. Hall ◽  
S. F. Suffolk ◽  
D. T. W. Bryant
Keyword(s):  
Citric Acid ◽  
Ion Exchange ◽  
Pilot Plant ◽  
Potassium Hydroxide ◽  
Exchange Resin ◽  
Ionic Composition ◽  
Fission Products ◽  
Ion Exchange Resin ◽  
The Other ◽  
Design And Construction

SummaryA pilot plant with a capacity of 2300 1./5 h day for the removal of cationic fission products from milk is described. The process involves the acidification of the milk with citric acid to pH 5.25 and its passage through an ion exchange resin charged with the ions of Ca, K, Na and Mg in the same proportions as those in which they occur in milk. The effluent milk is neutralized with potassium hydroxide. At the end of the day the plant and resin bed are washed and sterilized.Two resin beds are provided and are used on alternate days, one being washed and regenerated while the other is in use. Regeneration is carried out with a solution which removes radioactive cations and restores the resin bed to its original ionic composition.Bacteriological tests show that the method of cleaning both plant and resin bed is satisfactory.Conclusions are drawn as to a suitable design for a larger scale plant.

Experimental Investigation of Methane Assisted Pulverized Coal Flames Using an Optical Accessible Combustion Chamber

2021 ◽  
pp. 327-338
Author(s):  
C. Axt ◽  
D. Zabrodiec ◽  
S. Pielsticker ◽  
T. Kreitzberg ◽  
O. Hatzfeld ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Combustion Chamber ◽  
Pulverized Coal

scholarly journals Measurement of O2 in the Combustion Chamber of Apulverized Coal Boiler

10.14311/1544 ◽  
2012 ◽  
Vol 52 (3) ◽  
Author(s):  
Břetislav Janeba ◽  
Michal Kolovratník ◽  
Ondřej Bartoš
Keyword(s):  
Combustion Chamber ◽  
Flue Gas ◽  
Combustion Process ◽  
Pulverized Coal ◽  
Or Management ◽  
Pulverized Coal Boiler ◽  
O2 Concentration ◽  
Coal Boiler ◽  
The Individual ◽  
Lambda Probe

Operational measurements of the O2 concentration in the combustion chamber of a pulverized coal boiler are not yet common practice. Operators are generally satisfied with measuring the O2 concentration in the second pass of the boiler, usually behind the economizer, where a flue gas sample is extracted for analysis in a classical analyzer. A disadvantage of this approach is that there is a very weak relation between the measured value and the condition in specific locations in the fireplace, e.g. the function of the individual burners and the combustion process as a whole. A new extractionline was developed for measuring the O2 concentration in the combustion chamber. A planar lambda probe is used in this approach. The extraction line is designed to get outputs that can be used directly for diagnosis or management of the combustion in the boiler.

scholarly journals Experimental Investigate on Pre-combustion Characteristic and Flame Shape of an Adjustable Axial Swirl Burner for Pulverized Coal Combustion

2020 ◽  
Author(s):  
Pengzhong Liu ◽  
Fang Niu ◽  
Pengtao Wang ◽  
Nan Jia ◽  
Jianming Zhou ◽  
...  
Keyword(s):  
High Temperature ◽  
Combustion Chamber ◽  
Flame Length ◽  
Pulverized Coal ◽  
Nox Emission ◽  
Maximum Temperature ◽  
Combustion Characteristic ◽  
Swirl Burner ◽  
Co Concentration ◽  
Flame Shape

Abstract The 14 MW pilot–scale pulverized coal experiment system was built, pre-combustion characteristic and flame shape of adjustable axial swirl burner was investigation, and influence of swirl number also was discussed. The temperature and species concentration distribution in pre-combustion chamber showed that a high temperature oxygen-free and high CO concentration zone appeared around central pulverized coal, which enhanced burnout and inhibiting or reduction NOx. The pre-combustion characteristic belonged to high temperature preheating combustion technology. The captured flame image showed that flame shape beyond pre-combustion chamber outlet belonged to turbulent diffusion flame. Then flame shape scales were obtained. For different swirl numbers, ignition, wall temperature, mean maximum temperature, oxygen-free boundary and CO concentration was discussed, the results indicated that S=1.67 had advantaged for burnout and reduction NOx emission on the basis of stable ignition and avoiding high temperature corrosion. Mean flame length and diameter and divergence angle also were analyzed, the results showed that S=1.67 case had moderate flame length and best diameter and divergence. It was favorable for flame stability and high temperature region in furnace part, and increasing burnout and deceasing NOx emission. Therefor the optimal selection was S=1.67 case under experimental condition.

scholarly journals A Remarkable Catalyst Combination to Widen the Operating Temperature Window of the Selective Catalytic Reduction of NO by NH3

ChemCatChem ◽  
2014 ◽  
Vol 6 (8) ◽  
pp. 2143-2143 ◽  
Author(s):  
Runduo Zhang ◽  
Ning Liu ◽  
Zhen Luo ◽  
Wei Yang ◽  
Xin Liang ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Operating Temperature ◽  
Reduction Of No ◽  
Temperature Window

Design and Construction of a Thermal Radiation Probe

1967 ◽  
Vol 89 (3) ◽  
pp. 395-398
Author(s):  
A. A. Orning ◽  
C. H. Schwartz
Keyword(s):  
Thermal Radiation ◽  
Response Curve ◽  
Pulverized Coal ◽  
Radiant Flux ◽  
Design And Construction

A thermal radiation probe was constructed and tested in pulverized-coal-fired furnaces. A rotatable sensing head on the side of a water-cooled probe permitted measurement of radiant flux within a 12.5 deg cone from any desired direction to a point within a furnace. A response curve for a corner-fired furnace showed radiant flux of 130,000 Btu per sq ft, hr, when viewing flame, and 60,000 Btu per sq ft, hr, when sensing wall reflection. Selected drawings of probe construction are given. Additional drawings are available from the U. S. Bureau of Mines.

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