High oxygen concentration oxygen-enriched pulverized coal fractional combustion method and device therefor

A technology of oxygen-enriched pulverized coal and graded combustion, which is applied in the direction of combustion methods, combustion control, and fuel supply adjustment, and can solve problems such as spontaneous combustion of pulverized coal, high oxygen concentration, deflagration, etc., and achieve the goal of reducing power consumption and heating area Effect

Inactive Publication Date: 2010-02-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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Problems solved by technology

However, in the current combustion mode, since the pulverized coal needs to be transported by the combustion-supporting gas to the boiler for combustion, if the amount of circulating flue gas is too small, the oxygen concentration in the pulverized coal transport gas will be too high, which will easily lead to the occurrence of pulverized coal in the pulverized coal transport pipe. Spontaneous combustion or even deflagration

Method used

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  • High oxygen concentration oxygen-enriched pulverized coal fractional combustion method and device therefor

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Effect test

Embodiment 1

[0019] Embodiment 1: coal burning is calculated by Fuxin coal, and the composition analysis of coal is: C ar =48.3%, H ar = 3.3%, O ar =8.6%, N ar =0.8%S ar = 1.0%, A ar = 23%, M ar = 15%, Q net，ar =18645 (kJ / kg), V daf = 41%. Taking the coal consumption of the boiler as 100t / h as an example, taking seconds as the unit of time, 27.78kg / s of coal is burned per second. In order to ensure the complete combustion of pulverized coal, the excess O 2 coefficient is 1.05, then O 2 30.09m 3 / s. O in the combustion gas 2 Concentration is 80%, need to circulate flue gas 7.52m 3 / s, the combustion process produces a total flue gas volume of 48.27m 3 / s, the recycled flue gas accounts for 15.58% of the total flue gas. The above volumes are standard state volumes. The specific plan is:

[0020] Total pulverized coal and total O 2 15%, 28% and 57% of the furnace are put into the first, second and third furnace respectively. That is to say, the amount of coal burned in the ...

Embodiment 2

[0024] Embodiment 2: coal burning is calculated by Yangquan anthracite, and the composition analysis of coal is: C ar = 68.9%, H ar =2.9%, O ar = 2.4%, N ar = 1% S ar = 0.8%, A ar =19%, M ar = 5%, Q net，ar =26400(kJ / kg), V daf = 9%. Taking the coal consumption of the boiler as 100t / h as an example, taking seconds as the unit of time, 27.78kg / s of coal is burned per second. In order to ensure the complete combustion of pulverized coal, the excess O 2 coefficient is 1.05, then O 2 41.87m 3 / s. O in the combustion gas 2 Concentration is 75%, need to circulate flue gas 13.95m 3 / s, the total flue gas produced during the combustion process is 55.83m 3 / s, the recycled flue gas accounts for 22.9% of the total flue gas. The above volumes are standard state volumes. The specific plan is:

[0025] Total pulverized coal and total O 2 20%, 33% and 47% of the furnace are put into the first, second and third furnace respectively. That is, the coal consumption of the firs...

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Abstract

The invention relates to a high oxygen concentration oxygen-enriched pulverized coal fractional combustion method and a device therefor. The invention has the technical scheme that a boiler type withthree stages of series connection hearths is adopted; when in combustion, the pulverized coal and oxygen are respectively put into the hearths for combustion according to the proportion in the combustion process; all recycling flue gas is pumped back into the first hearth and is blended with part of the oxygen filled in the first hearth for transmitting the pulverized coal for the first hearth; part of the flue gas generated by the first hearth is blended with part of the oxygen filled in the second hearth for transmitting the pulverized coal for the second hearth; and part of the flue gas generated by the second hearth is blended with part of the oxygen filled in the third hearth for transmitting the pulverized coal for the second hearth. The total concentration of O2 in the boiler reaches 70-80%; as the next stage of hearth adopts the flue gas generated by combustion of the previous hearth as dilute gas, the actual concentration of O2 in every stage of hearth is within the range of 30-40%. The quantity of the recycling flue gas is much less than that in the current oxygen-enriched combustion boiler, and the electricity consumption in the running of a flue gas circulation fan is obviously lowered.

Description

technical field [0001] The invention relates to clean combustion of pulverized coal in a coal-fired power station, in particular to a method for graded combustion of pulverized coal with high oxygen concentration and rich oxygen, belonging to the technical field of boilers. Background technique [0002] Coal-fired power plants are CO 2 Concentrated emission source, separation and capture of CO from flue gas 2 is to implement CO 2 Key to capture and storage (CCS) technology. At present, most boilers use air as the fuel oxidant, and CO in the flue gas produced by conventional air combustion 2 The concentration is 10% to 14%, and the rest is mainly N 2 . from N 2 Separation and capture of CO 2 Energy consumption is huge. Oxygen-enriched combustion technology produces N in the flue gas 2 The content is very small, which is convenient for compression and cooling to obtain liquid CO 2 , and simultaneously remove or recover other pollutants such as SO 2 and other harmful...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23N1/04
CPCY02E20/34
Inventor 高正阳阎维平方立军
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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