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Recirculating fluidized bed oxygen-enriched combustion apparatus and operation method thereof

A circulating fluidized bed and oxygen-enriched combustion technology, which is applied in the direction of fluidized bed combustion equipment, combustion methods, and fuel burned in a molten state, can solve the problems of low capture rate and waste of resources, so as to improve desulfurization efficiency and prevent Effects of deposition, avoidance of slagging and slag leakage

Active Publication Date: 2015-08-19
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing oxyfuel combustion plants have CO 2 A large number of emissions and other issues, resulting in CO 2 The problem of low capture rate, at the same time, after a large amount of flue gas is directly discharged, it causes a waste of resources

Method used

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  • Recirculating fluidized bed oxygen-enriched combustion apparatus and operation method thereof
  • Recirculating fluidized bed oxygen-enriched combustion apparatus and operation method thereof

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Embodiment 1

[0043] Such as figure 1 As shown, this embodiment discloses a circulating fluidized bed oxygen-enriched combustion device, including an air chamber 101, an air distribution device 102 arranged above the air chamber 101, and a furnace 103 arranged above the air distribution device 102. The upper part of the furnace 103 is connected with a high-temperature cyclone separator 104, the upper part of the high-temperature cyclone separator 104 is connected with a heating surface 106, and the lower part of the heating surface 106 is connected with an economizer 107, and the lower end of the high-temperature cyclone separator 104 passes through The feeder 105 is connected with the air distribution device 102, and the lower part of the economizer 107 is connected with a medium temperature cyclone separator 108, and the medium temperature cyclone separator 108 passes through the primary flue gas recirculation fan 109 and the primary air oxygen injector 111 in sequence It is connected wit...

Embodiment 2

[0052]In this embodiment, on the basis of Embodiment 1, the cold flue gas recirculation fan 119 is far away from the CO 2 One end of the compression and purification device 118 is connected to a Roots blower 120, and the Roots blower 120 is connected to a feeder 105 and a coal sowing pipe 125 respectively. The output port of the secondary flue gas recirculation fan 110 is connected with the coal sowing pipe 125 .

[0053] Such as figure 2 As shown, after the flue gas from the high-temperature cyclone separator 104 passes through the heating surfaces 106 and economizers 107 at various levels, the flue gas is divided into two parts, one part enters the medium-temperature cyclone separator 108 (accounting for about 70% of the flue gas), and the other Part of it enters the CO through the tail dust collector, etc. 2 The compressed purification device 118 compresses and purifies or discharges it into the atmosphere through a chimney. The flue gas dedusted by the medium-temperatu...

Embodiment 3

[0056] In this embodiment, in order to ensure the stable operation of the circulating fluidized bed boiler during the combustion process, the flue gas recirculation rate is set between 65% and 80%, that is, the flue gas separated by the medium temperature cyclone separator 108 accounts for 100% of the high temperature cyclone separator 104 65%~80% of the output flue gas is used as recirculated flue gas and used as primary air and secondary air respectively. By controlling the recirculation ratio within this range, by using medium-temperature flue gas as recirculation air, and recirculating it after oxygen injection, it can be used as bed material fluidization medium and combustion oxidant to effectively control CO in boiler exhaust. 2 The concentration is enriched to more than 80%, which is beneficial to the CO in the flue gas after coal combustion 2 Correspondingly, 20%-35% of the flue gas output by the high-temperature cyclone separator 104 passes through the flue gas prehea...

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Abstract

The invention discloses a recirculating fluidized bed oxygen-enriched combustion apparatus, which comprises an air compartment, an air distribution device arranged above the air compartment and a hearth arranged above the air distribution device; the upper part of the hearth is connected with a high-temperature cyclone separator; the upper part of the high-temperature cyclone separator is connected with a heating surface; the lower part of the heating surface is connected with an economizer. The invention further discloses an operation method of the recirculating fluidized bed oxygen-enriched combustion apparatus. The recirculating fluidized bed oxygen-enriched combustion apparatus and the operation method thereof, disclosed by the invention, overcome the defects in the prior art, and intermediate temperature flue gas is used as primary air and secondary air which respectively enter the hearth to serve as recirculating air, in addition, oxygen is injected into the primary air and the secondary air, and the oxygen injection amount can be adjusted, meanwhile, an oxidizing agent is provided for combustion in the hearth, the concentration of CO2 discharged from a boiler of a recirculating fluidized bed can be enriched to more than 80%, and the capture of the CO2 in the flue gas after combustion of coal is facilitated.

Description

technical field [0001] The invention relates to a circulating fluidized bed oxygen-enriched combustion device and an operation method thereof, belonging to the technical field of boiler manufacturing and energy-saving and environmental protection engineering. Background technique [0002] Carbon dioxide is generally considered to be one of the important causes of global warming due to its greenhouse effect. The use of fossil energy is the most important CO in the atmosphere. 2 Sources, if the global greenhouse gas emissions are counted by industry, the power generation industry is the largest source of emissions. And coal-fired power generation is the CO 2 The most important source of emissions, coal-fired power generation accounts for 40% of the global power generation industry. There are a large number of fossil fuel power plants in operation around the world, which requires finding a CO 2 emissions reduction solutions. Therefore, the international community has cond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/10F23C10/20F23J15/00F23C9/00F23L7/00
CPCF23C9/00F23C10/10F23C10/20F23J15/00F23L7/007F23L7/00Y02E20/34
Inventor 毛宇陈灿胡修奎霍锁善
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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