A burner for co-firing ammonia and natural gas

Abstract

This utility model discloses an ammonia and natural gas co-firing burner, relating to the field of burner technology. The igniter has a swirl bellows at its right end, and a natural gas pipeline is installed at the right end of the swirl bellows. An ammonia pipeline is connected to the bottom of the natural gas pipeline. An axial flow bellows is connected to the right ends of both the natural gas and ammonia pipelines, and an axial flow duct is connected to the right end of the axial flow bellows. A combustion-supporting air duct is connected to the rear end of the axial flow duct. By setting axial flow orifices and swirl orifices inside the axial flow duct, the outlet cross-sectional area of ​​the axial flow orifices and swirl orifices can be steplessly adjusted. Furthermore, the fuel mixing ratio, injection speed, and swirl number can be optimized, thereby increasing fuel efficiency. When discharging heat or flue gas, it can also be simultaneously discharged through multiple sets of orifices. Combined with the overall control of the combustion-supporting air volume, the natural gas can achieve sufficient diffusion and uniform mixing through the swirl airflow, resulting in rapid combustion and a stable flame.

Description

Technical Field

[0001] This utility model relates to the field of burner technology, specifically to a burner for co-firing ammonia and natural gas. Background Technology

[0002] As a combustion thermal device, the main functional and characteristic requirements of ammonia and natural gas co-firing burners are complete combustion, high efficiency, environmental protection and energy saving, good adjustability, and wide fuel adaptability, such as the use of alternative combustion and environmentally friendly fuels. The key parts of the burner are the nozzle and piping design. The nozzle design parameters determine the accuracy of the effect, and the piping design determines the fuel combination and combustion mode. However, existing co-firing burners have some shortcomings, such as:

[0003] A hydrogen and combustible gas co-firing burner with application number CN202420808821.7 is described. This device can attach a filter layer to the inside of the horn tube by a clip, and filter external impurities through the filter layer to prevent external impurities from entering the inside of the combustion air duct. However, during use, the combustion air is only arranged outside the fuel and lacks a multi-layer mixing channel, which results in a slow mixing rate between the fuel and the combustion air and is prone to incomplete combustion.

[0004] Therefore, we propose a co-firing burner for ammonia and natural gas to solve the problems mentioned above. Utility Model Content

[0005] The purpose of this invention is to provide an ammonia and natural gas co-firing burner to solve the problem mentioned in the background art that most co-firing burners on the market have slow fuel mixing rates and are prone to incomplete combustion.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an ammonia and natural gas co-firing burner, including an igniter and an axial flow duct connected to the right end of the igniter, wherein the outer side of the axial flow duct is provided with castable material;

[0007] The igniter is equipped with a swirl bellows on the right end, and a natural gas pipeline is installed on the right end of the swirl bellows. An ammonia pipeline is connected to the bottom of the natural gas pipeline. An axial bellows is connected to the right end of the natural gas pipeline and the ammonia pipeline. An axial air duct is connected to the right end of the axial bellows. An auxiliary combustion air duct is connected to the rear end of the axial air duct.

[0008] The axial flow duct is equipped with a flame-gathering hood, and the flame-gathering hood is equipped with axial flow air holes, and the axial flow air holes are equipped with swirling air holes. The swirling air holes are equipped with a central air hole, and the central air hole is equipped with an ignition channel.

[0009] By setting axial flow orifices and swirl orifices inside the axial flow duct, the outlet cross-sectional area of ​​the axial flow orifices and swirl orifices can be steplessly adjusted. Moreover, the optimized design of fuel mixing ratio, injection speed and swirl number ensures thorough mixing and high combustion rate, while also increasing fuel efficiency. When expelling heat or flue gas, it can be simultaneously discharged through multiple sets of orifices to avoid blockage. Combined with the overall control of the combustion air volume, the natural gas can achieve sufficient diffusion and uniform mixing through the swirl airflow, resulting in fast combustion speed and stable flame.

[0010] As a preferred technical solution of this utility model, the outer side of the axial flow duct is provided with a casting material, and the casting material is annular and connected to the axial flow duct, and a nozzle is provided at the right end of the axial flow duct.

[0011] The above technical solution can insulate the outside of the axial flow duct while also protecting the outside of the axial flow duct and the nozzle, thereby increasing the protective performance of the equipment during use.

[0012] As a preferred technical solution of this utility model, the rear end of the axial flow duct is provided with a first regulating valve, and the axial flow duct is connected to the combustion air duct through the first regulating valve. The first regulating valve can adjust the air intake of the combustion air duct, and the outer side of the combustion air duct is provided with a measuring air corrugated pipe.

[0013] The above technical solution enables the axial flow duct to be connected more stably with the combustion air duct, thereby increasing the stability of the equipment during operation.

[0014] As a preferred technical solution of this utility model, a second regulating valve is provided at the front end of the combustion-supporting air duct, and the combustion-supporting air duct is connected to the axial flow air duct through the second regulating valve.

[0015] The above technical solution makes it more convenient for users to adjust the air intake of the combustion air duct, and it can be connected to the axial flow air duct through the second regulating valve, which increases the sealing performance of the equipment during use.

[0016] As a preferred technical solution of this utility model, a central air regulating valve is provided at the front end of the combustion-supporting air duct, and the combustion-supporting air duct is connected to the axial flow air duct through the central air regulating valve.

[0017] The above technical solution enables the combustion-supporting air duct to be connected more stably to the igniter or central air duct, thereby increasing the stability of the equipment during use.

[0018] As a preferred technical solution of this utility model, a central air duct is provided at the right end of the igniter, and the igniter is connected to the axial flow air duct through the central air duct. Furthermore, wind speed axial flow regulating valves are respectively provided on the pipes connecting the central air duct, the swirl corrugated pipe, the axial flow corrugated pipe and the air inlet of the combustion air duct.

[0019] The above technical solution makes it easier to adjust the air volume of the central air duct, swirl corrugated duct, axial corrugated duct and combustion air duct, thereby increasing the controllability of the equipment during use.

[0020] As a preferred technical solution of this utility model, pressure sensors are provided inside the igniter swirl bellows, natural gas pipeline, ammonia pipeline, axial flow bellows, and combustion air pipe.

[0021] The above technical solution can effectively detect the pressure state of the burner during operation, thereby increasing the observability of the equipment during operation.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows: by setting axial flow air holes and swirl air holes inside the axial flow air duct, the outlet cross-sectional area of ​​the axial flow air holes and swirl air holes can be steplessly adjusted. Moreover, the optimized design of fuel mixing ratio, injection speed and swirl number not only achieves sufficient mixing and high combustion rate, but also increases fuel efficiency. When exhausting heat or flue gas, it can also be discharged simultaneously through multiple sets of air holes to avoid blockage. Combined with the overall control of combustion air volume, the natural gas can achieve sufficient diffusion of swirl airflow, uniform mixing, fast combustion speed and stable flame.

[0023] Furthermore, by using castable refractory material, the outer side of the axial flow duct can be insulated, and the axial flow duct and nozzle can also be protected, thereby increasing the protective performance of the equipment during use.

[0024] Furthermore, by installing pressure sensors inside the igniter swirl bellows, natural gas pipeline, ammonia pipeline, axial flow bellows, and combustion air duct, the pressure status of the burner during operation can be effectively detected, thereby increasing the observability of the equipment during operation. Attached Figure Description

[0025] Figure 1 This is a front view of the structure of this utility model;

[0026] Figure 2 This is a three-dimensional structural schematic diagram of the front cross-section of this utility model;

[0027] Figure 3 This is a schematic diagram of the rear elevation structure of this utility model;

[0028] Figure 4 This is a three-dimensional structural diagram of the natural gas pipeline and ammonia pipeline of this utility model;

[0029] Figure 5 This is a cross-sectional three-dimensional structural diagram of the axial flow duct of this utility model.

[0030] In the diagram: 1. Igniter; 2. Swirl air corrugated pipe; 3. Natural gas pipeline; 4. Ammonia pipeline; 5. Axial air corrugated pipe; 6. Axial air duct; 601. Flame hood; 602. Axial air hole; 603. Swirl air hole; 604. Central air hole; 605. Ignition channel; 7. Castable refractory; 8. Nozzle; 9. Combustion duct; 10. First regulating valve; 11. Measuring air pipe corrugated pipe; 12. Second regulating valve; 13. Central air regulating valve. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0032] To address the problem of slow fuel mixing rates and incomplete combustion in existing co-firing burners, the following solution is disclosed. Please refer to [link / reference]. Figures 1-5 This utility model provides a technical solution: an ammonia and natural gas co-firing burner, including an igniter 1 and an axial flow duct 6 connected to the right end of the igniter 1, wherein the outer side of the axial flow duct 6 is provided with a casting material 7;

[0033] The igniter 1 is provided with a swirl bellows 2 at the right end, and a natural gas pipeline 3 is installed at the right end of the swirl bellows 2. The bottom of the natural gas pipeline 3 is connected to an ammonia pipeline 4. The right ends of the natural gas pipeline 3 and the ammonia pipeline 4 are connected to an axial bellows 5, and the right end of the axial bellows 5 is connected to an axial air duct 6. The rear end of the axial air duct 6 is connected to a combustion air duct 9.

[0034] The flow rate of natural gas and ammonia into axial flow duct 6 is regulated by natural gas pipeline 3 and ammonia pipeline 4. When natural gas and ammonia enter axial flow duct 6, they are divided into three sections with different flow directions by axial flow vent 602, swirl vent 603 and central vent 604. Then, the ignition source inside igniter 1 is transmitted to axial flow duct 6 through swirl bellows 2, thereby igniting ignition channel 605, so that the natural gas and ammonia inside axial flow vent 602, swirl vent 603 and central vent 604 are burned. At the same time, the combustion air is transmitted to the inside of axial flow duct 6 through combustion air duct 9.

[0035] The axial flow duct 6 is provided with a flame gatherer 601 inside, and the flame gatherer 601 is provided with an axial flow air hole 602 inside, and the axial flow air hole 602 is provided with a swirl air hole 603 inside. The swirl air hole 603 is provided with a central air hole 604 inside, and the central air hole 604 is provided with an ignition channel 605 inside.

[0036] A castable 7 is provided on the outside of the axial flow duct 6, and the castable 7 is annular and connected to the axial flow duct 6. A nozzle 8 is provided at the right end of the axial flow duct 6, and a first regulating valve 10 is provided at the rear end of the axial flow duct 6. The axial flow duct 6 is connected to the combustion air duct 9 through the first regulating valve 10, and the first regulating valve 10 can regulate the air intake of the combustion air duct 9.

[0037] The combustion air duct 9 is provided with a second regulating valve 12 at its front end, and the combustion air duct 9 is connected to the axial flow air duct 6 through the second regulating valve 12. The combustion air duct 9 is provided with a measuring air corrugated pipe 11 on its outer side. The combustion air duct 9 is provided with a central air regulating valve 13 at its front end, and the combustion air duct 9 is connected to the axial flow air duct 6 through the central air regulating valve 13.

[0038] The igniter 1 has a central air duct at its right end, and the igniter 1 is connected to the axial flow air duct 6 through the central air duct. The central air duct, the swirl corrugated pipe 2, the axial flow corrugated pipe 5 and the air inlet of the combustion air duct 9 are respectively equipped with wind speed axial flow regulating valves. The swirl corrugated pipe 2, the natural gas pipeline 3, the ammonia pipeline 4, the axial flow corrugated pipe 5 and the combustion air duct 9 are all equipped with pressure sensors.

[0039] Working principle: When using this ammonia and natural gas co-firing burner, first connect the equipment to each set of pipelines. Adjust the flow rate of natural gas and ammonia into the axial flow duct 6 through natural gas pipeline 3 and ammonia pipeline 4. When natural gas and ammonia enter the axial flow duct 6, they are divided into three sections with different flow directions by the axial flow vent 602, swirl vent 603 and central vent 604. Then, the ignition channel 605 is ignited by the igniter 1, so that the natural gas and ammonia inside the axial flow vent 602, swirl vent 603 and central vent 604 are burned. At the same time, the combustion air is transmitted to the axial flow duct 6 through the combustion air duct 9, so that the natural gas and ammonia are further burned under the action of the combustion air.

[0040] When transmitting combustion-supporting air, the combustion-supporting air duct 9 can adjust the air intake volume of the combustion-supporting air through the first regulating valve 10. When adjusting the air force in the natural gas pipeline 3 and the ammonia pipeline 4, the air intake volume inside can be adjusted through the wind speed axial flow regulating valve. When the igniter 1 ignites the ignition channel 605, the ignition source of the igniter 1 will enter the ignition channel 605 through the central air duct for ignition.

[0041] This completes a series of tasks. The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0042] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An ammonia and natural gas co-firing burner, comprising an igniter (1) and an axial flow duct (6) connected to the right end of the igniter (1), wherein the outer side of the axial flow duct (6) is provided with castable material (7). Its features are: The igniter (1) is provided with a swirl bellows pipe (2) at the right end, and a natural gas pipe (3) is installed at the right end of the swirl bellows pipe (2). An ammonia pipe (4) is connected to the bottom of the natural gas pipe (3). An axial bellows pipe (5) is connected to the right end of the natural gas pipe (3) and the ammonia pipe (4). An axial air pipe (6) is connected to the right end of the axial bellows pipe (5). An auxiliary combustion air pipe (9) is connected to the rear end of the axial air pipe (6). The axial flow duct (6) is provided with a flame-gathering hood (601) inside, and the flame-gathering hood (601) is provided with an axial flow air hole (602) inside, and the axial flow air hole (602) is provided with a swirling air hole (603) inside, the swirling air hole (603) is provided with a central air hole (604) inside, and the central air hole (604) is provided with an ignition channel (605) inside.

2. The ammonia and natural gas dual-fired combustor of claim 1, wherein, The axial flow duct (6) is provided with a casting material (7) on the outside, and the casting material (7) is connected to the axial flow duct (6) in a ring shape, and a nozzle (8) is provided at the right end of the axial flow duct (6).

3. The ammonia and natural gas dual-fired combustor of claim 2, wherein, The axial flow duct (6) is provided with a first regulating valve (10) at the rear end, and the axial flow duct (6) is connected to the combustion air duct (9) through the first regulating valve (10). The first regulating valve (10) can adjust the air intake of the combustion air duct (9). The combustion air duct (9) is provided with a measuring air duct corrugated pipe (11) on the outside.

4. The ammonia and natural gas dual-fired combustor of claim 3, wherein, The combustion-supporting air duct (9) is provided with a second regulating valve (12) at the front end, and the combustion-supporting air duct (9) is connected to the axial flow air duct (6) through the second regulating valve (12).

5. The ammonia and natural gas dual-fired combustor of claim 4, wherein, The combustion-supporting air duct (9) is equipped with a central air regulating valve (13) at its front end, and the combustion-supporting air duct (9) is connected to the axial flow air duct (6) through the central air regulating valve (13).

6. The ammonia and natural gas dual-fired combustor of claim 1, wherein, The igniter (1) is provided with a central air duct at the right end, and the igniter (1) is connected to the axial flow air duct (6) through the central air duct. The central air duct, the swirl wind corrugated pipe (2), the axial flow wind corrugated pipe (5) and the air inlet of the combustion air duct (9) are respectively provided with wind speed axial flow air regulating valves.

7. The ammonia and natural gas co-firing burner according to claim 6, characterized in that, Pressure sensors are installed inside the igniter (1), the swirl bellows (2), the natural gas pipeline (3), the ammonia pipeline (4), the axial bellows (5), and the combustion air pipe (9).

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