Enhancing SNCR-aided combustion with oxygen addition

An oxygen and combustion zone technology, applied in gas fuel burners, combustion chambers, burners, etc., can solve problems such as reducing boiler thermal efficiency and energy loss

Inactive Publication Date: 2008-06-11
PRAXAIR TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adding any diluent other than recirculating flue gas wil...

Method used

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  • Enhancing SNCR-aided combustion with oxygen addition
  • Enhancing SNCR-aided combustion with oxygen addition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Table 1 illustrates the NO obtained by using SNCR with and without oxygen X reduction. In this example, it is assumed that oxygen reduced NO X 30% of baseline, NO reduced by SNCR X It is also 30% of the baseline, and the injection molar ratio of ammonia to nitrogen oxide is 1. It is further assumed that due to the decrease in gas temperature, when combined with oxygen, NO reduced by SNCR at the same injection ratio X The percentage is increased to 40%.

[0066] Table 1. With and without O 2 , Using SNCR to reduce NO X Example of

[0067] Combination method only SNCR

[0068] NO X (1b / MMBtu) Baseline 0.4 0.4

[0069] NO after O2 injection X (1b / MMBtu) 0.28

[0070] NO after adopting SNCR X (1b / MMBtu) 0.168

[0071] 0.28

[0072] SNCR's NO X Reduction% 40 30

[0073] NH3 consumption (1b / MMBtu) 0.108

[0074] 0.148

[0075] The above example shows the NO obtained by SNCR alone or oxygen injection alone X Reduction from 0.4 1b / MMBtu to 0.28 1b / MMBtu. Wh...

Embodiment 2

[0077] The invention is described in detail in the following examples simulated by a boiler computer model.

[0078] Based on the heat input, in Examples 1, 1a, 1b and 1c, bituminous coal from the Pittsburgh#8 (Pit#8) coal seam was used to feed a 220MW tangentially fired boiler. Examples 2, 2a, 2b, and 2c used Powder River from Wyoming Low-grade sub-bituminous coal from Basin (PRB). Table 2 summarizes the characteristics of coal.

[0079] Table 2

[0080] Industrial analysis (%, wet)

[0081] Pit#8 PRB

[0082] Moisture 5.2 28.7

[0083] V.M 38.1 32.0

[0084] F.C 48.1 33.7

[0085] Ash content 8.6 5.6

[0086] Total 100 100

[0087] Elemental analysis (%, dry)

[0088] C 74.0 68.30

[0089] H 5.1 4.91

[0090] N 1.6 1.00

[0091] O 7.9 17.25

[0092] S 2.3 0.70

[0093] ASH 9.1 7.84

[0094] Total 100 100

[0095] HHV(btu / 1b, wet) 12540 8650

[0096] Table 3 summarizes the operating characteristics of the boilers in the followin...

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Abstract

NOx emissions from combustion are reduced, NOx reduction efficiency by SNCR is improved, and other efficiencies are realized, by injecting oxygen into a fuel-rich combustion zone (10) under controlled conditions.

Description

Invention field [0001] The present invention relates to the combustion of hydrocarbon fuels, such as coal, in, for example, electric furnaces, and the reduction of nitrogen oxides produced during the combustion process. Background of the invention [0002] Burning coal in the furnace of a power plant is still an important method of generating energy. Because it is believed that this combustion causes NO in the atmosphere X Emissions, which are believed to cause air pollution. There is still considerable interest in finding ways to reduce NO emissions into the atmosphere during combustion X Method of quantity. [0003] A well-known reduction in NO emissions from boilers and furnaces X The method is to inject reagents such as ammonia, urea, cyanuric acid or ammonium carbonate into the combustion chamber, because the reagent forms an amine group (-NH 2 ), reacts with NO in the high-temperature combustion gas in the combustion chamber to form N 2 . This method is well known as a sele...

Claims

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Application Information

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IPC IPC(8): F23M3/02F23C5/00A61B18/08C01BF23C5/32F23C6/04F23C7/00F23D1/00F23D14/24F23D17/00F23J15/00F23L7/00F23L9/04
CPCY02E20/344F23D2900/00006F23C2900/06041F23C7/004F23L2900/07007F23D1/00F23N2037/28F23C2201/20F23L7/007F23L9/04F23C2900/99004F23C2201/101F23C6/045F23D17/007F23N2037/08F23D14/24F23C6/047F23C5/32F23J15/003F23L2900/07006F23D2900/01001F23N2237/08F23N2237/28Y02E20/34
Inventor H·科巴亚施K·T·吴L·E·布尔三世
Owner PRAXAIR TECH INC
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