CN-224230008-U - Methane-mixed ammonia combustion heater structure for power station boiler

CN224230008UCN 224230008 UCN224230008 UCN 224230008UCN-224230008-U

Abstract

The utility model relates to the technical field of combustion heaters, in particular to a methane-doped ammonia combustion heater structure for a power station boiler, which comprises a combustion chamber, wherein a burner body is arranged in the combustion chamber, a porous medium is arranged at the downstream of the burner body, a fuel fluid central passage is arranged at the center of the burner body, a primary axial passage, a secondary axial passage, a plurality of jet holes and a tertiary radial passage are formed in the burner body, a primary axial swirl passage is formed in the primary axial passage through a primary blade, a secondary axial swirl passage is formed in the secondary axial passage through a secondary blade, and a tertiary radial swirl passage is formed in the tertiary radial passage through a tertiary blade.

Inventors

LIU MINGHOU
LIU CHANG
WU FUSHENG
CHEN QUAN
CHU QINGGUO
SU MINGZHOU
SHENG JIE
TANG PENG

Assignees

安徽省新能电气科技有限公司

Dates

Publication Date: 20260512
Application Date: 20250612

Claims (7)

1. The methane-doped ammonia gas combustion heater structure for the utility boiler comprises a combustion chamber, and is characterized in that a burner body is arranged in the combustion chamber, and a porous medium is concentrically aligned and connected to the downstream of the burner body; The center of the burner body is provided with a fuel fluid center channel, a first-stage axial channel and a second-stage axial channel which are concentrically arranged inside and outside are formed in the burner body positioned at the periphery of the fuel fluid center channel, a third-stage radial channel is formed in the outer circular surface of the burner body, a first-stage axial swirl channel is formed in the first-stage axial channel through a first-stage blade, a second-stage axial swirl channel is formed in the second-stage axial channel through a second-stage blade, a third-stage radial swirl channel is formed in the third-stage radial channel through a third-stage blade, a plurality of first jet holes are uniformly formed in the burner body positioned between the fuel fluid center channel and the first-stage axial channel in the circumferential direction, and a plurality of second jet holes are uniformly formed in the burner body positioned between the first-stage axial channel and the second-stage axial channel in the circumferential direction; The cross-sectional area of the primary air outlet corresponding to the primary axial swirl channel is gradually increased, the cross-sectional areas of the secondary air outlet and the tertiary cooling air outlet corresponding to the secondary axial swirl channel and the tertiary radial swirl channel are gradually reduced, and the secondary air outlet and the tertiary cooling air outlet are respectively inclined towards the center of the burner body and the inner wall of the combustion chamber.
2. The utility boiler methane-blended ammonia gas fired heater structure of claim 1, wherein a plurality of said primary vanes are circumferentially and uniformly disposed in a primary axial passage, a plurality of said secondary vanes are circumferentially and uniformly disposed in a secondary axial passage, and a plurality of said tertiary vanes are circumferentially and uniformly disposed in a tertiary radial passage.
3. The methane-blended ammonia gas fired heater structure for a utility boiler of claim 2, wherein the primary and secondary vanes are arranged in a reverse helical arrangement.
4. The methane-blended ammonia gas fired heater structure for a utility boiler of claim 2, wherein the primary and secondary vanes are each provided in a curved configuration.
5. A utility boiler methane-blended ammonia fired heater structure according to claim 3, wherein the tertiary vanes are angularly adjustable disposed in a tertiary radial passage.
6. The methane-doped ammonia gas combustion heater structure for a utility boiler according to claim 1, wherein the first jet hole and the second jet hole are designed by adopting special-shaped holes, the upstream of the first jet hole and the second jet hole is arranged in a circular shape, and the downstream outlet is arranged in a larger shape.
7. The methane-blended ammonia gas fired heater structure for a utility boiler of claim 1, wherein the porous medium is a double-deck porous structure, and the density of holes near one end of the burner body is high and the density of holes far from the one end of the burner body is low.

Description

Methane-mixed ammonia combustion heater structure for power station boiler Technical Field The utility model relates to the technical field of combustion heaters, and particularly discloses a methane-doped ammonia combustion heater structure for a power station boiler. Background At present, a plurality of domestic thermal power generating units are considered to adopt plasma ignition, micro-oil ignition and other ignition modes to reduce fuel consumption. When the thermal generator set adopts plasma ignition to start the boiler in a cold state, an auxiliary heat source is still needed and is used for working procedures such as hot air powder preparation of a coal mill, soot blowing of a boiler air preheater, thermal deoxidation of water supply and the like. At present, the implementation mode of the heat source of the power plant is mainly to set a starting boiler, introduce a unit auxiliary steam header or communicate with an auxiliary steam header of an adjacent boiler. By adopting the mode, for the power plants with two newly built units and below, besides the construction cost of the starting boiler room is increased, the starting cost is greatly increased by a large amount of fuel oil consumed by the starting boiler. In order to solve the problem of large fuel consumption during cold start of a power station boiler, the case of adopting methane to mix ammonia as fuel gas for combustion heating exists in the industry, but the case is limited by the defect of structural design of a burner, so that the sufficient mixing between methane and ammonia cannot be realized, and stable on-duty flame cannot be formed for heating cold air. Based on the structure, the methane-ammonia mixing combustion heater structure for the utility boiler is provided, so that methane and ammonia can be fully mixed and stable on-duty flame is formed to heat cold air, the purpose of reducing carbon emission of cold start of the boiler while the cold coal mill of the utility boiler is started is met, and the aim of reducing carbon and reducing carbon is fulfilled. Disclosure of utility model The utility model aims to provide a methane-ammonia mixing combustion heater structure for a power station boiler, so that methane and ammonia mixed gas can be fully and stably combusted, and cold air can be preheated by using the methane-ammonia mixing combustion heater structure as an auxiliary heat source, and carbon emission of cold start of the boiler is reduced while the cold coal mill of the power station boiler is started. The utility model is realized by the following technical scheme: The methane-doped ammonia gas combustion heater structure for the utility boiler comprises a combustion chamber, wherein a burner body is arranged in the combustion chamber, and a porous medium is concentrically aligned and connected to the downstream of the burner body; The center of the burner body is provided with a fuel fluid center channel, a first-stage axial channel and a second-stage axial channel which are concentrically arranged inside and outside are formed in the burner body positioned at the periphery of the fuel fluid center channel, a third-stage radial channel is formed in the outer circular surface of the burner body, a first-stage axial swirl channel is formed in the first-stage axial channel through a first-stage blade, a second-stage axial swirl channel is formed in the second-stage axial channel through a second-stage blade, a third-stage radial swirl channel is formed in the third-stage radial channel through a third-stage blade, a plurality of first jet holes are uniformly formed in the burner body positioned between the fuel fluid center channel and the first-stage axial channel in the circumferential direction, and a plurality of second jet holes are uniformly formed in the burner body positioned between the first-stage axial channel and the second-stage axial channel in the circumferential direction; The cross-sectional area of the primary air outlet corresponding to the primary axial swirl channel is gradually increased, the cross-sectional areas of the secondary air outlet and the tertiary cooling air outlet corresponding to the secondary axial swirl channel and the tertiary radial swirl channel are gradually reduced, and the secondary air outlet and the tertiary cooling air outlet are respectively inclined towards the center of the burner body and the inner wall of the combustion chamber. As a further arrangement of the above-described aspect, a plurality of the primary vanes are circumferentially uniformly arranged in the primary axial passage, a plurality of the secondary vanes are circumferentially uniformly arranged in the secondary axial passage, and a plurality of the tertiary vanes are circumferentially uniformly arranged in the tertiary radial passage. As a further arrangement of the scheme, the primary blades and the secondary blades are arranged in a reverse spiral mode. As a further arrangement of the scheme, the pr