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Coal firing method with low discharged nitrous oxides

A low-nitrogen oxide, coal-burning technology, applied in the field of low pollutant emissions, can solve the problems of heating regenerative burners, unsuitable, high-temperature air combustion technology application problems, etc., so as to inhibit the generation of NOx and reduce the generation of NOx. , to ensure the effect of combustion stability and burnout

Active Publication Date: 2009-06-24
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the flue gas produced by pulverized coal combustion contains fly ash, it cannot be used to heat the regenerative burner. Therefore, it is not suitable to use the regenerative body technology to recover the flue gas and preheat it to provide high-temperature air for the pulverized coal boiler. The application of high temperature air combustion technology in pulverized coal boilers has brought difficulties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Burn a bituminous coal with a calorific value of 4000kcal / kg, and 10% of the total fuel (denoted as F) (denoted as F B ) into the adiabatic circulating fluidized bed combustor, and the remaining 90% (denoted as F P ) into the pulverized coal boiler furnace. The primary air is introduced from the bottom of the circulating fluidized bed combustion chamber, and the primary air volume is F B The corresponding theoretical air volume (denoted as A B ) of 40%, the secondary air is introduced from the middle of the combustion chamber, and the air volume is A B 273% of. Since the combustion chamber is adiabatic, F BThe heat released by combustion is used to heat the flue gas, the temperature of the flue gas at the outlet of the combustion chamber will reach 800°C, and the oxygen content of the flue gas is 14.28%.

[0029] In the pulverized coal boiler furnace, the primary air accounts for F P The corresponding theoretical air volume (denoted as A P ) of 45%, the secondary ...

Embodiment 2

[0032] Burn a kind of bituminous coal with a calorific value of 5000kcal / kg, and 25% of the total fuel (denoted as F) (denoted as F B ) into the adiabatic circulating fluidized bed combustor, and the remaining 75% (denoted as F P ) into the pulverized coal boiler furnace. The primary air is introduced from the bottom of the circulating fluidized bed combustion chamber, and the primary air volume is F B The corresponding theoretical air volume (denoted as A B ) of 50%, the secondary air is introduced from the middle of the combustion chamber, and the air volume is A B 219%. Since the combustion chamber is adiabatic, F B The heat released by combustion is used to heat the flue gas, the temperature of the flue gas at the outlet of the combustion chamber will reach 880°C, and the oxygen content of the flue gas is 13.2%.

[0033] In the pulverized coal boiler furnace, the primary air accounts for F P The corresponding theoretical air volume (denoted as A P ) of 30%, the secon...

Embodiment 3

[0035] Burn anthracite with a calorific value of 6000kcal / kg, and 35% of the total fuel (denoted as F) (denoted as F B ) into the adiabatic circulating fluidized bed combustor, and the remaining 65% (denoted as F P ) into the pulverized coal boiler furnace. The primary air is introduced from the bottom of the circulating fluidized bed combustion chamber, and the primary air volume is F B The corresponding theoretical air volume (denoted as A B ) of 60%, the secondary air is introduced from the middle of the combustion chamber, and the air volume is A B 179% of. Since the combustion chamber is adiabatic, F B The heat released by combustion is used to heat the flue gas, the temperature of the flue gas at the outlet of the combustion chamber will reach 950°C, and the oxygen content of the flue gas is 12.2%.

[0036] In the pulverized coal boiler furnace, the primary air accounts for F P The corresponding theoretical air volume (denoted as A P ) of 20%, the secondary wind ac...

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Abstract

The invention discloses a fire coal method to discharge low nitrogen oxide, which is characterized by the following: adopting high temperature oxygen-enriched smoke gas from circulating fluidized bed burner as high temperature low oxygen twice wind of pulverized coal fired boiler; burning coal dust in high temperature low oxygen coordinating wind with temperature at 800-950 deg. c; decreasing generated quantity of nitrogen oxide (NOx)greatly; controlling circulating fluidized bed burner and main combustion area of coal dust burner fire box at reducing atmosphere; controlling burning temperature; inhibiting the generation of NOx; keeping stability and complete burning property of burning; realizing low NOx discharge of boiler; decreasing the discharging quantity of NOx below 130mg / Nm3.

Description

technical field [0001] The invention relates to the technical field of environmental protection, and relates to a coal burning method, in particular to a method for low pollutant discharge used in pulverized coal boilers. Background technique [0002] During the combustion of coal, NO, NO 2 , N 2 Nitrogen oxides (NOx) including O. In order to reduce NOx emissions, a variety of low NOx coal combustion technologies have been developed. In the early days, the generation of NOx was mainly reduced through low-oxygen and low-temperature combustion in the furnace, and the low-oxygen combustion of the entire furnace was realized by reducing the oxygen at the furnace outlet. This technology has limited reduction in NOx emissions. The combustion process is delayed, and the content of fly ash combustibles increases. . Later, the air staged combustion technology became the mainstream technology, that is, low-oxygen combustion was used in the main combustion zone to suppress the form...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C10/00F23N3/00
CPCY02E20/34
Inventor 吕清刚那永洁朱建国高鸣孙运凯包绍麟矫维红贺军
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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