CN217763417U - Heat exchange and denitration integrated ammonia burner - Google Patents

Heat exchange and denitration integrated ammonia burner Download PDF

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Publication number
CN217763417U
CN217763417U CN202221395996.7U CN202221395996U CN217763417U CN 217763417 U CN217763417 U CN 217763417U CN 202221395996 U CN202221395996 U CN 202221395996U CN 217763417 U CN217763417 U CN 217763417U
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combustion
flue gas
ammonia
denitration
air
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靳世平
程一兵
王宇
马柳昊
陈静
薛鹏飞
朱旭仁
杜建国
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Foshan Xianhu Laboratory
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Foshan Xianhu Laboratory
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Abstract

The utility model discloses a heat transfer denitration integration ammonia combustor, include: a combustion furnace chamber; an air outer cylinder; the ammonia fuel spray gun is communicated with the combustion hearth; the combustion flue gas outer cylinder is communicated with the combustion hearth; a hot air pipe; the heat exchange structure is arranged between the hot air pipe and the combustion flue gas outer cylinder and is used for transferring the heat of the air in the combustion flue gas outer cylinder to the air in the hot air pipe; denitration catalysis subassembly. The invention integrates the burner, the heat exchanger and the ammonia-spraying selective catalyst into a whole in structure, thereby realizing low-nitrogen combustion. The combustion air is preheated by the flue gas, the stability of ammonia combustion is improved, and the flue gas temperature is reduced to reduce the nitrogen oxide by high-efficiency catalyst denitration under certain temperature conditions.

Description

Heat exchange and denitration integrated ammonia burner
Technical Field
The utility model relates to a combustor technical field, especially a heat transfer denitration integration ammonia combustor.
Background
At present, the 'hydrogen' energy is considered as an important direction of the development of global energy structures in the future, ammonia is used as a high-efficiency zero-carbon carrier of hydrogen, the mass hydrogen content is as high as 17.6%, the ammonia can be liquefied at normal temperature by 8atm, the industrial chain of preparation, storage and transportation is mature, and the energy density of the liquid ammonia is 18.8MJ/kg, so that the ammonia is the zero-carbon fuel which has the highest potential to replace the traditional fossil energy and is applied to industrial thermal equipment such as power boilers, industrial furnaces, internal combustion engines, gas turbines and the like. The ammonia has the advantage of no carbon, the emission after complete combustion is only water and nitrogen, and the ammonia is used as a carbon-free fuel and has the advantages of high heat value, easy storage and the like. However, when ammonia is used as fuel, the ammonia has poor combustion stability and contains fuel nitrogen, so that the emission of nitrogen oxides in the combustion process is greatly increased, and environmental pollution is caused. Therefore, the design of the ammonia combustor which has low nitrogen oxide emission, stable combustion and good economy has very important practical significance and use value in the combustion field and the industrial field.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the heat exchange and denitration integrated ammonia burner is provided to solve one or more technical problems in the prior art and at least provide a beneficial choice or creation condition.
The utility model provides a solution of its technical problem is:
a heat exchange and denitration integrated ammonia burner comprises:
a combustion furnace chamber;
the air outer barrel is provided with an air outlet, and the air outlet is communicated with the combustion hearth;
the ammonia fuel spray gun is communicated with the combustion hearth;
the combustion flue gas outer cylinder is provided with a flue gas outlet and a flue gas inlet, the flue gas inlet is communicated with the combustion hearth, and the pressure of the flue gas outlet is smaller than the pressure in the combustion hearth;
the hot air pipe is provided with a cold air inlet and a hot air outlet, and the hot air outlet is communicated with the air outer cylinder;
the heat exchange structure is arranged between the hot air pipe and the combustion flue gas outer cylinder and is used for transferring the heat of the air in the combustion flue gas outer cylinder to the air in the hot air pipe;
the denitration catalysis assembly is arranged at the flue gas outlet.
Through the technical scheme, combustion air enters the air outer barrel 200 from the air inlet 210, ammonia fuel enters the ammonia fuel spray gun 300 and is radially sprayed out from an atomizing nozzle of the ammonia fuel spray gun 300, and the combustion air and the ammonia fuel are mixed, combusted and sprayed into a hearth at the air outlet 220 of the air outer barrel 200.
The burnt flue gas in the burning furnace chamber enters into the burning flue gas outer cylinder 400 through the flue gas inlet 410, and because of the negative pressure effect of the flue gas outlet 420, the burning flue gas can flow from the flue gas inlet 410 to the flue gas outlet 420, and the burning flue gas can flow through the heat exchange structure 600 in the flowing process of the burning flue gas outer cylinder 400, and the burning flue gas is cooled in the heat exchange structure 600, and the burning flue gas enters into the denitration catalysis component after the temperature is reduced to about 350 ℃. The combustion flue gas reacts in the denitration catalytic assembly as follows:
4NH3+4NO+O2=4N2+6H2O;
8NH3+6NO2=7N2+12H2O;
4NH3+3O2=2N2+6H2O;
the combustion flue gas is denitrated through ammonia-mixed selective catalytic reduction reaction and then discharged from the flue gas outlet 420.
The utility model discloses structurally with combustor, heat exchanger and spout ammonia selection catalyst converter integration, realize the low-nitrogen combustion.
The utility model discloses rely on the flue gas to preheat combustion air, the stability of ammonia burning is improved in the help, reduces flue gas temperature help simultaneously and realizes that high efficiency catalyst denitration reduces nitrogen oxide under the uniform temperature condition.
The utility model discloses use the ammonia as main fuel, also can be used to the ammonia combustor of part mixing natural gas, simple structure can make flame more stable to reduce nitrogen oxide's emission in a large number.
As a further improvement of the above technical solution, the denitration catalyst assembly includes a denitration catalyst and an ammonia nozzle, and the ammonia nozzle is disposed on a side of the denitration catalyst, which is far away from the flue gas outlet.
According to the technical scheme, ammonia water is sprayed out in a mist form through the ammonia spray pipe 800 and is sprayed into the front of the denitrification catalyst 700 in a mist form, the mist ammonia water is uniformly mixed with flue gas in the front of the denitrification catalyst 700, and the flue gas after being cooled and denitrated through the ammonia mixing selective catalytic reduction reaction is discharged from the flue gas outlet 420; combustion-supporting air enters the hot air duct 500 through the cold air inlet 510, and exchanges heat with air in the combustion flue gas outer cylinder 400 through the heat exchange structure 600, and the air in the hot air duct 500 flows to the air outer cylinder 200 after being heated by hotter combustion flue gas, and then flows through the cyclone 900 to be mixed with ammonia fuel sprayed from the ammonia nozzle for combustion.
As a further improvement of the technical scheme, the front end of the ammonia spray pipe is provided with an atomizing spray head.
Through above-mentioned technical scheme, atomizer can atomize the aqueous ammonia, can increase the surface area of aqueous ammonia to increase reaction rate.
As a further improvement of the technical scheme, the ammonia fuel spray gun is arranged in the middle of the air outer cylinder, and a swirler is arranged at the communication position of the air outer cylinder and the combustion hearth.
Through the technical scheme, the cyclone can enable the ammonia fuel and the combustion air to be mixed more uniformly, and the combustion reaction can be fully carried out.
As a further improvement of the technical scheme, the air outer cylinder, the ammonia fuel spray gun, the combustion flue gas outer cylinder, the hot air pipe, the heat exchange structure and the denitration catalytic assembly are combined to form a plurality of heat exchange denitration assemblies, and the heat exchange denitration assemblies are uniformly distributed around the combustion hearth.
As a further improvement of the technical scheme, the air outlets of the two heat exchange denitration assemblies positioned at two opposite sides of the combustion hearth are opposite to the flue gas inlet.
Through the technical scheme, the flue gas generated by mixed combustion at the air outer barrel 200 can move into the combustion flue gas outer barrel 400 in a relatively close path.
The utility model has the advantages that: the invention integrates the burner, the heat exchanger and the ammonia-spraying selective catalyst into a whole in structure, thereby realizing low-nitrogen combustion.
The invention preheats combustion air by means of flue gas, helps to improve the stability of ammonia combustion, and simultaneously reduces the temperature of the flue gas, helps to realize high-efficiency catalyst denitration and reduce nitrogen oxides under a certain temperature condition.
The invention creates the ammonia burner which takes ammonia gas as main fuel and can also be used for partially mixing natural gas, has simple structure, can make flame more stable and greatly reduce the emission of nitrogen oxides.
The utility model is used for combustor technical field.
Drawings
In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures represent only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from these figures without inventive effort.
Fig. 1 is a schematic sectional structure diagram of an embodiment of the present invention.
In the figure, 100, a combustion furnace chamber; 200. an air outer cylinder; 210. an air inlet; 220. an air outlet; 300. an ammonia fuel spray gun; 400. a combustion flue gas outer cylinder; 410. a flue gas inlet; 420. a flue gas outlet; 500. a hot air pipe; 510. a cold air inlet; 520. a hot air outlet; 600. a heat exchange structure; 700. a denitrification catalytic reactor; 800. an ammonia spray pipe; 900. a cyclone.
Detailed Description
The conception, specific structure, and technical effects of the present invention will be clearly and completely described in conjunction with the embodiments and the accompanying drawings, so that the objects, features, and effects of the present invention can be fully understood. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention. In addition, all the coupling/connection relationships mentioned herein do not mean that the components are directly connected, but mean that a better coupling structure can be formed by adding or reducing coupling accessories according to specific implementation conditions. All technical characteristics in the invention can be interactively combined on the premise of not conflicting with each other.
Referring to fig. 1, a heat exchange denitration integration ammonia combustor includes combustion furnace 100 and heat exchange denitration subassembly. The combustion chamber 100 is provided as a hollow cylindrical member. The quantity of heat transfer denitration subassembly sets up to a plurality ofly, and two liang of pairs of oppositions of a plurality of heat transfer denitration subassemblies set up in the relative both sides of burning furnace 100 to a plurality of heat transfer denitration subassemblies are evenly arranged around the central axis of burning furnace 100.
The heat exchange and denitration component comprises an ammonia fuel spray gun 300, an air outer barrel 200, a hot air pipe 500, a combustion flue gas outer barrel 400, a denitration catalytic component and a heat exchange structure 600.
The air outer cylinder 200 is fixedly connected with the side wall of the combustion chamber 100. The air tub 200 is provided with an air inlet 210 and an air outlet 220.
The air inlet 210 is communicated with the outside, the air outlet 220 is communicated with the combustion chamber 100, and the cyclone 900 is arranged at the air outlet 220.
The ammonia fuel spray gun 300 is installed at the middle part of the air outer cylinder 200, the ammonia fuel spray gun 300 penetrates through the middle part of the swirler 900, and the front end of the ammonia fuel spray gun 300 is communicated with the combustion chamber 100.
The heat exchange structure 600 is located between the outer combustion flue gas cylinder 400 and the hot air pipe 500, and the heat exchange structure 600 is used for transferring the heat of the hotter air in the outer combustion flue gas cylinder 400 to the air in the hot air pipe 500.
The two ends of the hot air duct 500 are respectively provided with a cold air inlet 510 and a hot air outlet 520, the cold air inlet 510 is communicated with the outside, and the hot air outlet 520 is communicated with the air outer cylinder 200. The hot air duct 500 includes a duct body and a telescopic duct, the telescopic duct is disposed between the two duct bodies, and the two duct bodies are respectively connected with the air outer tub 200 and the combustion chamber 100.
The combustion flue gas outer cylinder 400 is provided with a flue gas outlet 420 and a flue gas inlet 410, the flue gas inlet 410 is communicated with the combustion hearth 100, the pressure at the flue gas outlet 420 is smaller than the pressure of the combustion hearth 100, specifically, negative pressure can be formed by means of an induced draft fan and the like, so that the combustion flue gas can be smoothly discharged. The air outer cylinders 200 of the combustion flue gas outer cylinder 400 are spaced apart from each other by a predetermined distance.
The denitration catalyst assembly includes a denitration catalyst 700 and an ammonia lance 800. The dosage of the reducing agent, the airspeed and the area of the catalyst in the denitrification catalytic reactor 700 are calculated and determined according to the condition that the maximum removal rate of the nitrogen oxide in the combustion flue gas is 90 percent and meets the emission standard. The front end of ammonia spray tube 800 is equipped with the atomizer, and ammonia spray tube 800 sets up in the one side that takes away from flue gas outlet 420 of denitration catalyst 700. The air in the combustion flue gas outer cylinder 400 is cooled to about 350 ℃ through the heat exchange structure 600, and then the medium-temperature catalyst and the low-temperature catalyst are used, and the suitable reaction temperatures of different catalysts are different. The lower the reaction temperature requirement, the higher the catalyst cost, and generally the better the catalyst economy and denitration effect when using about 350 ℃). The ammonia water flows to the ammonia nozzle 800, the ammonia nozzle 800 sprays the ammonia water in a fog shape, the fog ammonia water is uniformly mixed with the combustion flue gas, the fog ammonia water flows to the denitration catalyst 700 along with the combustion flue gas, and the combustion flue gas reacts in the denitration catalyst 700 as follows:
4NH3+4NO+O2=4N2+6H2O;
8NH3+6NO2=7N2+12H2O;
4NH3+3O2=2N2+6H2O;
the combustion flue gas is denitrated through ammonia-mixed selective catalytic reduction reaction and then discharged from the flue gas outlet 420.
The two heat exchange denitration assemblies located at the two opposite sides of the combustion furnace 100 are arranged in opposite directions, so that the air outlet 220 of one heat exchange denitration assembly is arranged opposite to the flue gas inlet 410 of the other heat exchange denitration assembly, and the flue gas generated by the mixed combustion at the air outer barrel 200 can move to enter the combustion flue gas outer barrel 400 in a relatively close path.
The implementation principle of the scheme is as follows: combustion air enters the air outer barrel 200 from the air inlet 210, ammonia fuel enters the ammonia fuel spray gun 300 and is radially sprayed out from an atomizing nozzle of the ammonia fuel spray gun 300, and the combustion air and the ammonia fuel are mixed, combusted and sprayed into a hearth through the swirler 900 at the air outlet 220 of the air outer barrel 200.
The flue gas after the burning in the furnace enters into burning flue gas urceolus 400 through flue gas entry 410, because the negative pressure effect of exhanst gas exit 420, burning flue gas can flow from exhanst gas entry 410 to exhanst gas exit 420, and burning flue gas can flow through heat transfer structure 600 at the in-process that burning flue gas urceolus 400 flows, and burning flue gas is cooled down at heat transfer structure 600, and burning flue gas gets into denitration catalytic component after the temperature reduces to about 350 ℃.
The ammonia water is sprayed out in a mist form through the ammonia spray pipe 800 and is sprayed in the mist form in front of the denitrification catalyst 700, the mist ammonia water is uniformly mixed with the flue gas in front of the denitrification catalyst 700, and the flue gas after being cooled and denitrated through the ammonia mixing selective catalytic reduction reaction is discharged from the flue gas outlet 420; combustion-supporting air enters the hot air duct 500 through the cold air inlet 510, and exchanges heat with air in the combustion flue gas outer cylinder 400 through the heat exchange structure 600, and the air in the hot air duct 500 flows to the air outer cylinder 200 after being heated by hotter combustion flue gas, and then flows through the cyclone 900 to be mixed with ammonia fuel sprayed from the ammonia nozzle for combustion.
The invention integrates the burner, the heat exchanger and the ammonia-spraying selective catalyst into a whole in structure, thereby realizing low-nitrogen combustion.
The invention preheats combustion air by means of flue gas, helps to improve the stability of ammonia combustion, and simultaneously reduces the temperature of the flue gas, helps to realize high-efficiency catalyst denitration and reduce nitrogen oxides under a certain temperature condition.
The invention creates the ammonia burner which takes ammonia gas as main fuel and can also be used for partially mixing natural gas, has simple structure, can make flame more stable and greatly reduce the emission of nitrogen oxides.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the details of the embodiments shown, but is capable of various modifications and substitutions without departing from the spirit of the invention.

Claims (6)

1. The utility model provides a heat transfer denitration integration ammonia combustor which characterized in that: the method comprises the following steps:
a combustion furnace chamber;
the air outer barrel is provided with an air outlet, and the air outlet is communicated with the combustion hearth;
the ammonia fuel spray gun is communicated with the combustion hearth;
the combustion flue gas outer cylinder is provided with a flue gas outlet and a flue gas inlet, the flue gas inlet is communicated with the combustion hearth, and the pressure of the flue gas outlet is smaller than the pressure in the combustion hearth;
the hot air pipe is provided with a cold air inlet and a hot air outlet, and the hot air outlet is communicated with the air outer cylinder;
the heat exchange structure is arranged between the hot air pipe and the combustion flue gas outer cylinder and is used for transferring the heat of the air in the combustion flue gas outer cylinder to the air in the hot air pipe;
the denitration catalysis assembly is arranged at the flue gas outlet.
2. The heat exchange and denitration integrated ammonia burner as claimed in claim 1, characterized in that: the denitration catalysis subassembly includes denitration catalyst ware and ammonia spray tube, the ammonia spray tube set up in denitration catalyst ware is kept away from the one side of exhanst gas outlet.
3. The heat exchange and denitration integrated ammonia burner as claimed in claim 2, wherein: and the front end of the ammonia spray pipe is provided with an atomizing nozzle.
4. The heat exchange and denitration integrated ammonia burner as claimed in claim 1, characterized in that: the ammonia fuel spray gun is arranged in the middle of the air outer barrel, and a swirler is arranged at the communication position of the air outer barrel and the combustion hearth.
5. The heat exchange and denitration integrated ammonia burner as claimed in claim 1, characterized in that: the air outer cylinder, the ammonia fuel spray gun, the combustion flue gas outer cylinder, the hot air pipe, the heat exchange structure and the denitration catalytic assembly are combined to form a heat exchange denitration assembly, the number of the heat exchange denitration assemblies is multiple, and the heat exchange denitration assemblies are uniformly distributed around the combustion furnace chamber.
6. The heat exchange and denitration integrated ammonia burner as claimed in claim 5, wherein: the air outlets of the two heat exchange and denitration assemblies positioned on two opposite sides of the combustion hearth are opposite to the flue gas inlet.
CN202221395996.7U 2022-06-06 2022-06-06 Heat exchange and denitration integrated ammonia burner Active CN217763417U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116329260A (en) * 2023-05-26 2023-06-27 佛山仙湖实验室 Combined treatment method for ammonia extraction, ammonia combustion and denitration of aluminum ash by wet method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116329260A (en) * 2023-05-26 2023-06-27 佛山仙湖实验室 Combined treatment method for ammonia extraction, ammonia combustion and denitration of aluminum ash by wet method

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