Low-carbon low-nitrogen ammonia gas type burner

Abstract

The utility model provides a low-carbon low-nitrogen ammonia gas type burner which comprises a burner body, an oxygen gas injection unit and an ammonia gas injection unit. The oxygen injection unit comprises an oxygen inlet, an oxygen cavity, an oxygen injection pipe and an oxygen injection pipe connecting plate; the oxygen inlet is connected with an oxygen generating device through a pipeline; an oxygen precision regulating valve and an oxygen flow meter are mounted on the pipeline; the ammonia gas spraying unit comprises an ammonia gas inlet, an ammonia gas cavity, an ammonia gas spraying pipe, an ammonia gas spraying pipe connecting plate and an ammonia gas cavity connecting plate; the ammonia gas inlet is connected with an ammonia gas generating device through a pipeline; and an ammonia gas precision regulating valve and an ammonia gas flow meter are mounted on the pipeline. Oxygen and ammonia gas are distributed through a plurality of small spray pipes, so that the oxygen and the ammonia gas can be uniformly premixed, and hidden dangers possibly existing due to the fact that mixed gas stays in a large cavity for a long time are avoided; meanwhile, compared with a premixed metal fiber felt which is commonly used in the market and made of iron-chromium-aluminum alloy, the air-equalizing and fire-retarding device made of the porous medium has higher fire resistance.

Description

Technical Field

[0001] The utility model relates to the technical field of combustion equipment, in particular to a low-carbon and low-nitrogen ammonia burner. Background Art

[0002] Affected by the decreasing of non-renewable energy such as fossil fuels and the increasing pressure of ecological environment protection, renewable clean energy such as hydrogen is becoming an important research direction. Although hydrogen is the most ideal fuel, due to its physical property limitations, the cost of transportation and storage is high and the difficulty is great. As a carrier of hydrogen, ammonia is easy to liquefy, store and transport, has a higher volume energy density, and generates nitrogen and water after complete combustion, without pollution and carbon emission, and has good application prospects as an energy carrier.

[0003] Most of the existing ammonia burners simply adopt a swirling method to achieve strong mixing of ammonia and air. Although attention is also paid to suppressing the generation of nitrogen oxides, due to the deviation of combustion methods and concepts, although low-carbon emissions are achieved, more nitrogen oxides are still generated, and true "clean energy" cannot be achieved.

[0004] Based on the above technical problems, the utility model proposes a new low-carbon and low-nitrogen ammonia burner. Content of the Utility Model

[0005] (I) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the utility model provides a low-carbon and low-nitrogen ammonia burner, which solves the problem of generating more nitrogen oxides and cannot achieve true clean energy.

[0007] (II) Technical Solutions

[0008] To achieve the above object, the utility model is realized through the following technical solutions: a low-carbon and low-nitrogen ammonia burner, comprising: a burner main body, an oxygen jetting unit and an ammonia jetting unit;

[0009] The oxygen jetting unit includes an oxygen inlet, an oxygen cavity, an oxygen nozzle, and an oxygen nozzle connecting plate; the oxygen inlet is connected to an oxygen generating device through a pipeline, and an oxygen precision regulating valve and an oxygen flowmeter are installed on the pipeline;

[0010] The ammonia jetting unit includes an ammonia inlet, an ammonia cavity, an ammonia nozzle, an ammonia nozzle connecting plate and an ammonia cavity connecting plate; the ammonia inlet is connected to an ammonia generating device through a pipeline, and an ammonia precision regulating valve and an ammonia flowmeter are installed on the pipeline;

[0011] The oxygen nozzle connecting plate on the oxygen cavity is connected to the ammonia cavity connecting plate at the front end of the ammonia cavity; a plurality of oxygen nozzles are installed on the oxygen nozzle connecting plate along the circumference; a plurality of ammonia nozzles are arranged on the ammonia nozzle connecting plate along the circumference; one end of the oxygen nozzle is communicated with the oxygen cavity, and the other end is arranged inside the ammonia nozzle;

[0012] The flow rates of the oxygen and ammonia are controlled according to a ratio of 3.05:4;

[0013] The burner body further includes a cylinder body. The front section of the cylinder body is sleeved outside the ammonia nozzle and connected to the ammonia nozzle connecting plate; a mixed gas cavity communicated with the ammonia nozzle is arranged inside the rear section of the cylinder body. A promoting winding ring is arranged inside the free end of each ammonia nozzle, and a uniform air flow and flame retardant device is arranged at the end of the cylinder body.

[0014] Preferably, a plurality of inclined grooves are evenly distributed along the circumferential direction on the inner wall of the promoting winding ring.

[0015] Preferably, the promoting winding ring is welded inside the ammonia nozzle, and is 18 - 20 mm away from the outlet end of the ammonia nozzle.

[0016] Preferably, the uniform air flow and flame retardant device adopts a disc-shaped structure made of high-temperature resistant porous medium composite ceramics, and the thickness is 45 - 50 mm.

[0017] Preferably, the pores of the uniform air flow and flame retardant device are less than 3 mm.

[0018] Preferably, the oxygen nozzle penetrates through the oxygen cavity, and the part extending into the ammonia nozzle is coaxial with the ammonia nozzle.

[0019] Preferably, the oxygen supplied by the oxygen jetting unit is pure oxygen, and the pressure is 0.1 - 0.2 MPa.

[0020] (III)Advantages

[0021] The present utility model provides a low-carbon and low-nitrogen ammonia burner, which has the following advantages:

[0022] 1. Compared with the prior art, in the present utility model, oxygen enters the oxygen inlet and the oxygen gas chamber of the burner through the control of the oxygen flow valve group, and then is evenly distributed through the oxygen nozzle. Ammonia enters the ammonia inlet and the ammonia gas chamber through the control of the oxygen-ammonia flow valve group, and then is evenly distributed through the ammonia nozzle. The oxygen nozzle and the ammonia nozzle are coaxially arranged, and the oxygen nozzle is placed inside the ammonia nozzle. The oxygen is pure oxygen, and the pressure is generally between 0.1 MPa and 0.2 MPa. The high-pressure oxygen sucks the ammonia in the ammonia gas chamber at a relatively high injection speed, allowing the ammonia to evenly enter the mixing area of ammonia and oxygen through the ammonia nozzle. After the two gases are mixed, they flow through the promoting ring arranged at the front end of the ammonia nozzle, forming a strong turbulent mixture, and are sprayed forward into the mixing gas chamber together, and then enter the air distribution and flame arrestment device and are sprayed into the furnace for combustion to generate heat.

[0023] 2. Compared with the prior art, an oxygen flowmeter and an oxygen precision regulating valve are arranged on the oxygen flow valve group of the present utility model, and an ammonia flowmeter and an ammonia precision regulating valve are arranged on the ammonia flow valve group. The flow rates of oxygen and ammonia are strictly controlled in proportion. While achieving complete combustion, oxygen is accurately controlled to avoid the generation of thermal type nitrogen oxides. Oxygen and ammonia are distributed through multiple small nozzles, which can not only make the pre-mixing of oxygen and ammonia uniform, but also avoid potential hazards that may exist due to the excessive residence time of the mixed gas in a larger cavity. At the same time, the air distribution and flame arrestment device made of porous medium has higher fire resistance than the pre-mixed metal fiber felt made of iron-chromium-aluminum alloy commonly used in the market. The mixed gas is mixed more evenly, and the irregular pores less than 3 mm have better fire arrestment performance, which can effectively prevent the backfire of ammonia. The present utility model realizes the zero-carbon and zero-nitrogen emission effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic top view of the cross-section of the present utility model;

[0025] Figure 2 It is a schematic front view of the cross-section of the burner cylinder of the present utility model;

[0026] Figure 3 It is a front view of the promoting ring of the present utility model

[0027] Figure 4 It is a schematic top view of the cross-section of the promoting ring of the present utility model.

[0028] Among them, 1. Oxygen inlet; 11. Oxygen gas chamber; 12. Oxygen nozzle; 13. Oxygen nozzle connecting plate; 14. Oxygen precision regulating valve; 15. Oxygen flowmeter;

[0029] 2. Ammonia inlet; 21. Ammonia flowmeter; 22. Ammonia precision regulating valve; 23. Ammonia gas chamber; 24. Ammonia nozzle; 25. Promoting ring; 26. Ammonia gas chamber connecting plate; 27. Ammonia nozzle connecting plate;

[0030] 3. Burner cylinder; 31. Installation flange; 32. Air distribution and flame arrestment device; 33. Mixed gas cavity;

[0031] 4. Main body of ammonia burner. Specific embodiments

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0033] As Figures 1-4 shown, the embodiment of the present invention provides a low-carbon and low-nitrogen ammonia burner, including: a burner main body 4, an oxygen jetting unit and an ammonia jetting unit;

[0034] The oxygen jetting unit includes an oxygen inlet 1, an oxygen cavity 11, an oxygen nozzle 12, and an oxygen nozzle connecting plate 13; the oxygen inlet 1 is connected to an oxygen generating device through a pipeline, and an oxygen precision regulating valve 14 and an oxygen flow meter 15 are installed on the pipeline. Oxygen enters the oxygen inlet 1 and the oxygen cavity 11 of the burner through the control of the oxygen precision regulating valve 14, and then is evenly distributed through the oxygen nozzle 12.

[0035] As a preferred technical solution, the oxygen supplied by the oxygen jetting unit is pure oxygen, and the pressure is 0.1 - 0.2 MPa.

[0036] The ammonia jetting unit includes an ammonia inlet 2, an ammonia cavity 23, an ammonia nozzle 24, an ammonia nozzle connecting plate 27, and an ammonia cavity connecting plate 26; the ammonia inlet 2 is connected to an ammonia generating device through a pipeline, and an ammonia precision regulating valve 22 and an ammonia flow meter 21 are installed on the pipeline. Ammonia enters the ammonia inlet 2 and the ammonia cavity 23 through the control of the ammonia precision regulating valve 22, and then is evenly distributed through the ammonia nozzle 24.

[0037] The oxygen nozzle connecting plate 13 installed at the end of the oxygen chamber 11 is connected to the ammonia chamber connecting plate 26 installed at the front end of the ammonia chamber 23 through a connecting piece. A plurality of oxygen nozzles 12 are installed along the circumference on the oxygen nozzle connecting plate 13; the ammonia nozzle connecting plate 27 is connected to the other end of the ammonia chamber 23, and a plurality of ammonia nozzles 24 are arranged along the circumference on the ammonia nozzle connecting plate 27. One end of the oxygen nozzle 12 communicates with the oxygen chamber 11, and the other end is arranged inside the ammonia nozzle 24. The oxygen nozzle 12 penetrates through the oxygen chamber 11, and the part extending into the ammonia nozzle 24 is coaxial with the ammonia nozzle 24. Ammonia enters the ammonia nozzle 24 through the ammonia chamber 23, oxygen enters the oxygen nozzle 12 through the oxygen chamber 11. There is a certain distance between the front end of the oxygen nozzle 12 and the front end of the ammonia nozzle, which is the mixing area of the two gases. Oxygen is sprayed out from the port of the oxygen nozzle 12 and mixed with ammonia at the end of the ammonia nozzle 24 in this mixing area. After flowing through the action of the promoting winding ring 25 arranged at the front end of the ammonia nozzle 24, a strong turbulent mixture is formed, which is sprayed forward into the mixed gas chamber 33 together, and then sprayed into the furnace for combustion after passing through the air distribution and fire resistance device 32 to generate heat.

[0038] The flow rates of oxygen and ammonia are controlled according to the ratio of 3.05:4. While achieving complete combustion, the oxygen is accurately controlled to avoid the generation of thermal type nitrogen oxides.

[0039] The burner body 4 further includes a cylinder 3. The front end of the cylinder 3 is sleeved outside the ammonia nozzle 24. The oxygen nozzle 12 and the ammonia nozzle 24 are coaxially arranged, and the oxygen nozzle 12 is placed inside the ammonia nozzle 24 and connected to the ammonia nozzle connecting plate 27; a mixed gas chamber 33 communicating with the ammonia nozzle 24 is arranged inside the rear section of the cylinder 3. A promoting winding ring 25 is arranged inside the free end of each ammonia nozzle 24. An air distribution and fire resistance device 32 is arranged at the end of the cylinder 3. The air distribution and fire resistance device 32 has higher fire resistance performance, and the irregular pore fire resistance performance is better. The pores of the air distribution and fire resistance device 32 are less than 3 mm, and the irregular pore fire resistance performance is better, which can effectively prevent the backfire of ammonia and achieve the effect of zero carbon and zero nitrogen emissions.

[0040] As a preferred technical solution, the air distribution and fire resistance device 32 is made of a disc-shaped structure of high-temperature resistant porous medium composite ceramics, with a thickness of 45 - 50 mm. 16 inclined grooves are evenly distributed along the circumferential direction on the inner wall of the promoting winding ring 25. The promoting winding ring 25 is welded inside the ammonia nozzle, 18 - 20 mm away from the outlet end of the ammonia nozzle.

[0041] The main design basis of the present utility model is the chemical formula:

[0042] 4NH3 + 3O2 = 2N2 + 6H2O. This chemical formula is the reaction formula for the combustion of ammonia in pure oxygen, with the condition of ignition. Most of the existing burners on the market are for the combustion of ammonia in air, and the chemical reaction formula is 4NH3 + 5O2 = 4NO + 6H2O. Therefore, no matter how the low-nitrogen structure is designed, the generation of nitrogen oxides cannot be avoided.

[0043] Working principle: Oxygen enters the oxygen inlet 1 and the oxygen gas chamber 11 of the burner through the control of the oxygen precision regulating valve 14, and then is evenly distributed through the oxygen nozzle 12; ammonia enters the ammonia inlet 2 and the ammonia gas chamber 23 through the control of the ammonia precision regulating valve 22, and then is evenly distributed through the ammonia nozzle 24. The oxygen nozzle 12 and the ammonia nozzle 24 are coaxially arranged, and the oxygen nozzle 12 is placed inside the ammonia nozzle 24. The oxygen is pure oxygen, and the pressure is generally between 0.1 MPa and 0.2 MPa. The high-pressure oxygen sucks the ammonia in the ammonia gas chamber 23 at a relatively high injection speed, allowing the ammonia to evenly enter the mixing area of ammonia and oxygen through the ammonia nozzle 24. After the two gases are mixed, they flow through the promoting ring 25 provided at the front end of the ammonia nozzle 24, and then form a strong turbulent mixture, which is sprayed forward into the mixed gas cavity 33 together, and then enters the air distribution and fire prevention device 32 and is sprayed into the furnace for combustion to generate heat.

[0044] The flow rates of oxygen and ammonia are strictly controlled in a ratio of 3.05:4 by the oxygen flow meter 15 and the ammonia flow meter 21. While achieving complete combustion, the oxygen is accurately controlled to avoid the generation of thermal nitrogen oxides. The oxygen and ammonia are fed into multiple small nozzles, which can not only premix the oxygen and ammonia evenly, but also avoid the potential hazards that may exist due to the excessive residence time of the mixed gas in a larger cavity; at the same time, the air distribution and fire prevention device 32 has higher fire resistance and better fire prevention performance for irregular pores.

[0045] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-carbon and low-nitrogen ammonia burner, characterized in that, Including: A burner main body (4), an oxygen injection unit, and an ammonia injection unit; The oxygen injection unit includes an oxygen inlet (1), an oxygen chamber (11), an oxygen nozzle (12), and an oxygen nozzle connecting plate (13); the oxygen inlet (1) is connected to an oxygen generating device through a pipeline, and an oxygen precision regulating valve (14) and an oxygen flowmeter (15) are installed on the pipeline; The ammonia injection unit includes an ammonia inlet (2), an ammonia chamber (23), an ammonia nozzle (24), an ammonia nozzle connecting plate (27), and an ammonia chamber connecting plate (26); the ammonia inlet (2) is connected to an ammonia generating device through a pipeline, and an ammonia precision regulating valve (22) and an ammonia flowmeter (21) are installed on the pipeline; The oxygen nozzle connecting plate (13) on the oxygen chamber (11) is connected to the ammonia chamber connecting plate (26) at the front end of the ammonia chamber (23); a plurality of oxygen nozzles (12) are installed on the oxygen nozzle connecting plate (13) in a circumferential distribution; a plurality of ammonia nozzles (24) are arranged on the ammonia nozzle connecting plate (27) in a circumferential distribution; one end of the oxygen nozzle (12) communicates with the oxygen chamber (11), and the other end is arranged inside the ammonia nozzle (24); The flow rates of the oxygen and ammonia are controlled in a ratio of 3.05:4; The burner main body (4) further includes a cylinder body (3). The front section of the cylinder body (3) is sleeved outside the ammonia nozzle (24) and connected to the ammonia nozzle connecting plate (27); a mixed gas chamber (33) communicating with the ammonia nozzle (24) is arranged inside the rear section of the cylinder body (3). A swirling ring (25) is arranged inside the free end of each ammonia nozzle (24), and a wind equalizing and flame arresting device (32) is arranged at the end of the cylinder body (3).

2. The low-carbon and low-nitrogen ammonia-type burner according to claim 1, characterized in that: Sixteen inclined grooves are evenly distributed along the circumferential direction on the inner wall of the swirling ring (25).

3. The low-carbon and low-nitrogen ammonia-type burner according to claim 2, characterized in that: The swirling ring (25) is welded inside the ammonia nozzle, 18 - 20 mm away from the outlet end of the ammonia nozzle.

4. The low-carbon and low-nitrogen ammonia gas burner according to claim 1, characterized in that: The wind equalizing and flame arresting device (32) is a disc-shaped structure made of a high-temperature resistant porous medium composite ceramic, with a thickness of 45 - 50 mm.

5. The low-carbon and low-nitrogen ammonia gas burner according to claim 4, characterized in that: The pores of the wind equalizing and flame arresting device (32) are less than 3 mm.

6. The low-carbon and low-nitrogen ammonia-type burner according to claim 1, wherein: The oxygen nozzle (12) penetrates through the oxygen chamber (11), and the part extending into the ammonia nozzle (24) is coaxial with the ammonia nozzle (24).

7. The low-carbon and low-nitrogen ammonia gas burner according to any one of claims 1-6, characterized in that: The oxygen supplied by the oxygen injection unit is pure oxygen, with a pressure of 0.1 - 0.2 MPa.

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