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Water vapor circularly adjusting type oxygen-enriched combustion method for pulverized coal boiler

An oxygen-enriched combustion, pulverized coal boiler technology, applied in the field of pulverized coal combustion, can solve the problems of reducing CO2 capture efficiency, increasing N2 content, and cumbersome switching of oxygen-enriching combustion systems, reducing air leakage, simplifying circulation and purification equipment, Easy-to-manage effects

Active Publication Date: 2015-03-04
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, studies have found that the oxygen-enriched combustion method of the prior art still has the following defects or deficiencies: First, due to the circulation of a large amount of flue gas (60-80%), the NOx and SO in the flue gas 2 The content of N will continue to enrich with the increase of the number of cycles, and multiple flue gas cycles will increase the leakage phenomenon and make the N in the flue gas 2 Second, the above phenomenon will also greatly reduce the CO content in the oxy-fuel combustion flue gas 2 concentration, which increases the difficulty of subsequent compression purification and reduces CO 2 Third, a large amount of flue gas circulation will lead to cumbersome switching of the overall oxyfuel combustion system during operation, and there are problems such as complex auxiliary equipment and difficult control

Method used

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  • Water vapor circularly adjusting type oxygen-enriched combustion method for pulverized coal boiler
  • Water vapor circularly adjusting type oxygen-enriched combustion method for pulverized coal boiler

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Water vapor is obtained after the flue gas is condensed, and the test shows that the mass of water vapor obtained per kg of coal is 3.7Nm 3 , the water vapor is heated to 150°C by the preheater, 30% of which is used as primary air to transport coal powder, and the rest is used as secondary air to enter the furnace for combustion; the high-temperature flue gas after furnace combustion is heat exchanged, condensed and purified, then Compression system processes into liquid CO 2. The oxygen content entering the furnace accounts for 24.7% of the entire combustion-supporting gas, the water vapor content in the high-temperature flue gas is 65.6%, and the CO in the condensed flue gas 2 The concentration is 91.5%.

[0036] figure 2 is a schematic flow diagram according to another preferred embodiment of the present invention. Such as figure 2 As shown in , the main features of the oxygen-enriched combustion method according to the second preferred embodiment of the prese...

Embodiment 2

[0039] The flue gas produced by combustion is used as the primary air to enter the furnace, and then the flue gas is condensed to obtain water vapor. The test shows that the mass of water vapor obtained per kg of coal is 3.0Nm 3 , the water vapor is heated to 120°C by the preheater, mixed with pure oxygen obtained from air separation, and then enters the furnace as secondary air; the high-temperature flue gas after combustion in the furnace is heat-exchanged, condensed and purified, 51% of which (Equivalent to 26% before condensation) The circulating fan is used as the primary air to transport the pulverized coal into the furnace for combustion, and the rest is processed into liquid CO by the compression system 2 . The oxygen content entering the furnace accounts for 25.6% of the entire combustion-supporting gas, the water vapor content in the high-temperature flue gas is 56%, and the CO in the condensed flue gas 2 The concentration is 88.6%.

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Abstract

The invention discloses a water vapor circularly adjusting type oxygen-enriched combustion method for a pulverized coal boiler. The method is characterized in that in the whole oxygen-enriched combustion process, smoke generated by combustion is sequentially subjected to heat energy extraction, purification and condensation treatment, condensate water obtained after condensation treatment is heated to be converted into water vapor by using extracted heat energy, and a part of the water vapor is used as primary air to be fed into a boiler chamber of the pulverized coal boiler; and the rest of the water vapor is mixed with oxygen to serve as secondary air to be fed to the boiler chamber of the pulverized coal boiler. The invention further discloses other oxygen-enriched combustion modes by using the water vapor to execute circulation adjustment. By means of the water vapor circularly adjusting type oxygen-enriched combustion method and other oxygen-enriched combustion modes, problems that smoke with high concentration CO2 is difficult to obtain, pollutants of NOx, SO2 and the like are high in concentration and switching of starting and stopping of a system is complicated in prior art are solved, and the water vapor circularly adjusting type oxygen-enriched combustion method is particularly suitable for being used in occasions of pulverized coal boilers and the like.

Description

technical field [0001] The invention belongs to the technical field of pulverized coal combustion, and more specifically relates to a water vapor circulation regulating oxygen-enriched combustion method for a pulverized coal boiler. Background technique [0002] Oxygen-enriched combustion refers to the combustion technology that uses pure oxygen or oxygen-enriched (mixed gas with an oxygen concentration higher than 21%) instead of air as a combustion-supporting medium. Compared with traditional air combustion, it can eliminate a large amount of nitrogen that does not participate in the reaction. CO in the dry flue gas 2 The concentration reaches more than 80%, and it is easy to realize CO 2 capture and storage, thus becoming the most 2 most promising technology. [0003] The oxygen-enriched combustion method of pulverized coal boilers in the prior art mainly includes the following process: the oxygen with a concentration of more than 95% is separated from the air, mixed w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F22B1/18F23L7/00F23C9/00
CPCY02E20/34
Inventor 张立麒易宝军朱海跃胡鹏郑楚光
Owner HUAZHONG UNIV OF SCI & TECH
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