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Method for micro positive pressure oxygen-enriched combustion of pulverized coal

Oxygen-enriched combustion, micro-positive pressure technology, applied in combustion methods, combustion equipment, indirect carbon dioxide emission reduction, etc., can solve problems such as air leakage, ignition and stable combustion difficulties, etc.

Inactive Publication Date: 2010-09-22
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a micro-positive-pressure oxygen-enriched combustion method for pulverized coal, through which pulverized coal O 2 and CO 2 Cyclic micro-positive pressure combustion solves the problems of serious air leakage caused by the negative pressure of the furnace in the existing pulverized coal combustion method, and difficulties in ignition and stable combustion

Method used

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  • Method for micro positive pressure oxygen-enriched combustion of pulverized coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Ignition and combustion step: use the circulating flue gas to transport pulverized coal to the furnace, and at the same time, separate the air to obtain O 2 into the furnace, ignited and burned;

[0022] Flue gas circulation steps: the high-temperature flue gas produced by the combustion of pulverized coal in the furnace is divided into two parts. The first part of high-temperature flue gas accounts for 30% of the total high-temperature flue gas volume. After cooling, dust removal and desulfurization, it is compressed into liquid CO 2 ;The second part of high-temperature flue gas accounts for 70% of the volume of all high-temperature flue gas, which is used as circulating flue gas;

[0023] The second part of high-temperature flue gas is further divided into two paths: the first path of high-temperature flue gas accounts for 60% of the volume of circulating flue gas. Income O 2 Enter the furnace after mixing, after mixing O 2 The volume accounts for 30% of the volume...

Embodiment 2

[0026] Ignition and combustion step: use the circulating flue gas to transport pulverized coal to the furnace, and at the same time, separate the air to obtain O 2 into the furnace, ignited and burned;

[0027] Flue gas circulation steps: the high-temperature flue gas produced by the combustion of pulverized coal in the furnace is divided into two parts. The first part of high-temperature flue gas accounts for 30% of the total high-temperature flue gas volume. After cooling, dust removal and desulfurization, it is compressed into liquid CO 2 ;The second part of high-temperature flue gas accounts for 70% of the volume of all high-temperature flue gas, which is used as circulating flue gas;

[0028] The second part of high-temperature flue gas is further divided into two paths: the first path of high-temperature flue gas accounts for 80% of the volume of circulating flue gas. Income O 2 Enter the furnace after mixing, after mixing O 2 The volume accounts for 30% of the mixed ...

Embodiment 3

[0031] Ignition and combustion step: use the circulating flue gas to transport pulverized coal to the furnace, and at the same time, separate the air to obtain O 2 into the furnace, ignited and burned;

[0032] Flue gas circulation steps: the high-temperature flue gas produced by the combustion of pulverized coal in the furnace is divided into two parts. The first part of high-temperature flue gas accounts for 50% of the total high-temperature flue gas volume. After cooling, dust removal and desulfurization, it is compressed into liquid CO 2 ; The second part of high-temperature flue gas accounts for 50% of the volume of all high-temperature flue gas, which is used as circulating flue gas;

[0033] The second part of high-temperature flue gas is further divided into two paths: the first path of high-temperature flue gas accounts for 60% of the volume of circulating flue gas. Income O 2 Enter the furnace after mixing, after mixing O 2 The volume accounts for 28% of the volum...

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Abstract

The invention provides a method for micro positive pressure oxygen-enriched combustion of pulverized coal, belongs to a method for circulating combustion of oxygen gas (O2) and carbon dioxide (CO2) of the pulverized coal, and aims to solve the problems of serious air leak and difficult ignition and stable combustion existing in the conventional combustion method. The method comprises the steps of: 1,igniting and combusting: conveying the pulverized coal to a furnace hearth by using the circulation flue gas, and simultaneously conveying O2 to the furnace hearth for ignition; 2, circulating the flue gas: dividing the high-temperature flue gas generated by combustion into two parts, and performing cooling, dust removal and desulfurization compression on the first part of the flue gas to obtain liquid CO2; dividing the second part into two paths, conveying the first path to an entrance of the furnace hearth by using a high-temperature circulation fan and mixing the first path of the flue gas and O2; and performing cooling, dust removal and desulfurization on the second path of the flue gas, and conveying the second path carrying the pulverized coal to the furnace hearth by using a cold circulation fan, wherein the micro positive pressure in the furnace hearth is maintained in the combustion process. The method has the advantages of adjusting the steam temperature of the boiler by using the circulation flue gas, maintaining the pressure, avoiding air leak, increasing the steam temperature of the boiler, improving the heat efficiency of the boiler and the denitration rate, increasing the CO2 content after the high-temperature flue gas is cooled, reducing emission load of NOx, lowering CO2 capturing and collecting cost, and meeting the national energy conservation and environmental protection standard.

Description

technical field [0001] The invention belongs to a pulverized coal combustion method, in particular to a pulverized coal micro-positive pressure oxygen-enriched combustion method, which is used for stable combustion and CO combustion of boilers in the electric power industry. 2 catch. Background technique [0002] Existing pulverized coal in O 2 and CO 2 Ambient cyclic combustion process, using air separation to obtain O 2 The mixture of flue gas and partial combustion is combusted with fuel tissue, thereby increasing the CO in exhaust smoke 2 concentration, the pressure of the combustion furnace is about -50Pa micro-negative pressure, the combustion temperature is adjusted through the circulating flue gas, and at the same time, the circulating flue gas replaces the nitrogen in the air to carry heat to ensure the heat transfer and thermal efficiency of the boiler. [0003] o 2 and CO 2 Cyclic combustion is currently a hot spot in international research, because its zero...

Claims

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Application Information

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IPC IPC(8): F23C9/00F23L7/00
CPCY02E20/34
Inventor 邹春操时英郭鹏刘忠成刘晓东周旭凯徐龑
Owner HUAZHONG UNIV OF SCI & TECH
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