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Combustion system

a combustion system and combustion technology, applied in the field of combustion systems, can solve the problems of high carbon content of coal fuel, achieve the effects of reducing the flow rate of exhaust gas, and reducing the capacity of the smoke removal devi

Inactive Publication Date: 2013-04-18
MITSUBISHI HITACHIPOWER SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention reduces the amount of exhaust gas and smoke from a combustion furnace, which results in decreased flow rates and reduced capacity of the downstream smoke removal device. The invention achieves this by resupplying part of the exhaust gas back into the combustion furnace through the burner unit to form a reducing atmosphere. The exhaust gas that has passed through the smoke removal device is then introduced to the combustion oxygen supply port to promote complete combustion of unburned fuel. The result is a reduced concentration of nitrogen oxide in the exhaust gas that is discharged from the combustion furnace, which can help to maintain low levels of nitrogen oxide in the overall system.

Problems solved by technology

However, coal is high in carbon contents in fuel compared with oil and gas.

Method used

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first embodiment

[0035]FIG. 1 is a schematic structure view of a combustion system according to the first embodiment of the present invention.

[0036]The combustion system 1 includes a coal fired boiler (combustion furnace) 2, a coal pulverizer 3 for pulverizing coal supplied to the coal fired boiler 2, and a smoke removal device 9.

[0037]The coal fired boiler 2 is an oxygen combustion boiler which can conduct denitration inside the furnace (not shown) by two-stage combustion. The coal fired boiler 2 includes a furnace inside for combusting fuel, a burner unit 2a, and an additional air port (hereinafter referred to as “AA unit”) 2b. Coal as fuel supplied from the coal pulverizer 3, oxygen (combustion oxygen) introduced from a combustion oxygen supply system 21, and later-described secondary recirculation gas for burner unit 22 are introduced to the burner unit 2a. Remaining part of the oxygen introduced from the combustion oxygen supply system 21 to the burner unit 2a and later-described secondary reci...

second embodiment

[0061]Hereinafter, the second embodiment of the present invention will be described. A combustion system of the present embodiment is different from the first embodiment in the point that the secondary recirculation gas for AA unit is introduced from between the desulfurization device and the gas cooler. Other structural members are similar to those of the first embodiment. Therefore, like structural members and flows are designated by like reference signs to omit description.

[0062]FIG. 2 is a schematic structure view of a combustion system according to the second embodiment of the present invention.

[0063]Oxygen (combustion oxygen) introduced from a combustion oxygen supply system 21 and part of exhaust gas diverging from between a desulfurization device (desulfurization unit) 6 and a gas cooler (cooling unit) 7 which constitute a smoke removal device 9 are supplied to an AA unit (combustion oxygen supply port) 2b of a coal fired boiler (combustion furnace) 2 as secondary recirculat...

third embodiment

[0066]Hereinafter, the third embodiment of the present invention will be described. A combustion system of the present embodiment is different from the first embodiment in the point that the secondary recirculation gas for AA unit is introduced from between the dust removal device and the desulfurization device. Other structural members are similar to those of the first embodiment. Therefore, like structural members and flows are designated by like reference signs to omit description.

[0067]FIG. 3 is a schematic structure view of a combustion system according to the third embodiment of the present invention.

[0068]Oxygen (combustion oxygen) introduced from a combustion oxygen supply system 21 and part of exhaust gas diverging from between a dust removal device (dust removal unit) 5 and a desulfurization device (desulfurization unit) 6 which constitute a smoke removal device 9 are supplied to an AA unit (combustion oxygen supply port) 2b of a coal fired boiler (combustion furnace) 2 as...

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Abstract

A combustion system capable of decreasing nitrogen oxide discharged from exhaust gas is provided. The combustion system includes: a combustion furnace (2) having a burner unit (2a) for supplying fuel and combustion oxygen to the inside of the furnace, a reduction zone formed on a downstream side of the burner unit (2a) for combusting the fuel, and a combustion oxygen supply port (2b) for supplying combustion oxygen (21) so that unburned fuel which has passed the reduction zone completely combusts; and a smoke removal device (9) for removing smoke in the exhaust gas discharged from the combustion furnace (2). Part of exhaust gas (22) diverging from between the combustion furnace (2) and the smoke removal device (9) is introduced to the burner unit (2a), while part of exhaust gas (23) diverging from a downstream side of the smoke removal device (9) is introduced to the combustion oxygen supply port (2b).

Description

TECHNICAL FIELD [0001]The present invention relates to a combustion system, and more particularly relates to removal of nitrogen oxide in exhaust gas.BACKGROUND ART [0002]Coal is generally used as fuel in thermal power plants and the like since the resource volume of coal is abundant. However, coal is high in carbon contents in fuel compared with oil and gas. When coal is combusted by an air combustion boiler system, the emission amount of carbon dioxide is increased.[0003]In order to increase concentrations of carbon dioxide for easy recovery, an oxygen combustion boiler system 101 as shown in FIG. 5 is used. The oxygen combustion boiler system 101 includes a coal pulverizer 103 for pulverizing coal, an oxygen combustion boiler 102 for combusting the coal pulverized by the coal pulverizer 103 and discharging exhaust gas, a denitration device 104 for removing nitrogen oxide in the exhaust gas discharged from the oxygen combustion boiler 102, a dust removal device 105 for removing d...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F23J11/00
CPCF23C9/08F23C99/00F23L7/007Y02E20/344F23J11/00Y02E20/322F23L2900/07001F23C2202/10Y02E20/32Y02E20/34F23L7/00
Inventor MATSUDA, MASAHIKOSUGANUMA, HIROSHIARUGA, TAKESHIFUJIMURA, KOUTARODAIMARU, TAKUICHIRO
Owner MITSUBISHI HITACHIPOWER SYST LTD
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