Energy-heat conversion device for recycling industrial hydrogen-containing byproduct gas

Abstract

The invention provides an energy-heat conversion device for recycling industrial hydrogen-containing byproduct gas, and belongs to the technical field of combustors. The device comprises a hydrogen supply branch, an air supply branch and an energy-heat conversion device, hydrogen of the hydrogen supply branch comes from industrial by-product gas containing high-proportion hydrogen, the industrial by-product gas rich in hydrogen and air are pressurized through a compressor and then enter the energy-heat conversion device, the energy-heat conversion device comprises an air inlet pipe, an air outlet pipe and an air outlet pipe, the front portion of the nozzle body is communicated with an air supply branch, the front portion of the hydrogen inlet pipe is communicated with a hydrogen supply branch, gas supplied by the two branches is directly jetted into the combustion chamber through the nozzle body to organize coaxial diffusion combustion, and generated heat can be used for supplying heat or driving a small turbine to do work and the like. The energy-heat conversion device designed by the invention can realize the energy reutilization of industrial hydrogen-containing byproduct gas, and avoids serious energy waste caused by direct discharge of industrial waste gas.

Description

Technical Field

[0001] The invention belongs to the technical field of burners, and in particular relates to an energy-heat conversion device for recycling industrial hydrogen-containing byproduct gas. Background Art

[0002] Hydrogen is considered to be the most promising secondary energy source in the future due to its high calorific value, high efficiency, and zero carbon emissions. However, one of the key issues limiting the large-scale application of hydrogen energy at this stage is the high cost of hydrogen production, which leads to insufficient supply of pure hydrogen production and makes it difficult to apply it to production and heating on a large scale. On the other hand, the emission of industrial by-product gas is huge, which contains a high hydrogen content and is the best choice for the current low-cost hydrogen source. It can be concentrated and burned for use, realizing the secondary utilization of industrial waste gas energy and avoiding the serious waste caused by direct emissions.

[0003] Since industrial by-product gas contains a high proportion of hydrogen, the key to organizing the combustion of by-product gas / air lies in the reliable and stable combustion of hydrogen and air. The combustion reaction of hydrogen and air is gas-gas combustion. Since hydrogen and air premixed combustion is prone to flashback, which increases combustion instability, diffusion combustion is used. Among them, coaxial shear combustion has the advantages of good flame stability, high-temperature reaction zone mainly located at the shear layer, and relatively low thermal protection difficulty. It can achieve relatively efficient and stable combustion of hydrogen and air under high and low pressure conditions. Summary of the invention

[0004] In view of this, in order to solve the technical problems mentioned in the above background technology, the present invention proposes an energy-heat conversion device for recycling industrial hydrogen-containing by-product gas, which can meet the reliable ignition and stable combustion of hydrogen-containing by-product gas under low equivalence ratio conditions, and realize the energy-heat conversion of high combustion calorific value hydrogen in industrial by-product gas.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an energy-heat conversion device for recycling industrial hydrogen-containing by-product gas, comprising a hydrogen supply branch, an air supply branch and an energy-heat conversion device, wherein the hydrogen in the hydrogen supply branch comes from industrial by-product gas containing a relatively high proportion of hydrogen, and these hydrogen-rich industrial by-product gases and air are pressurized by a compressor and enter the energy-heat conversion device, the energy-heat conversion device comprises an air intake pipe, the front of which is connected to the air supply branch, a hydrogen intake pipe, the front of which is connected to the hydrogen supply branch, a nozzle body, a combustion chamber, a water cooling system and an igniter seat, hydrogen intake pipes are installed on both sides of the air intake pipe, two hydrogen intake pipes are connected to the nozzle body, the nozzle body is connected to the combustion chamber, and the combustion chamber is equipped with a water cooling system and an igniter seat;

[0006] The nozzle body includes a hydrogen outer cavity and an air inner cavity, wherein the hydrogen outer cavity is located outside the air inner cavity, and the hydrogen outer cavity and the air inner cavity are combined to form a fuel ring cavity, wherein a central air channel connected to an air intake pipe is provided in the air inner cavity, and two hydrogen connecting channels connected to the hydrogen intake pipe are provided in the circumferential direction, air is introduced into the central air channel of the nozzle body, and byproduct gas is introduced into the fuel ring cavity, thereby forming a coaxial shear airflow of byproduct gas and air in the combustion chamber.

[0007] Furthermore, the air intake pipe is a hollow curved tube structure.

[0008] Furthermore, the hydrogen inlet pipe is a hollow curved tube structure.

[0009] Furthermore, the water cooling system includes a front water cooling pipe joint, a confluence cavity, a cooling channel, a diversion cavity and a rear water cooling pipe joint. A rear water cooling pipe joint is installed at the outlet of the combustion chamber, and the rear water cooling pipe joint is connected to the diversion cavity. A front water cooling pipe joint is installed at the front of the combustion chamber, and the front water cooling pipe joint is connected to the confluence cavity. A plurality of cooling channels are axially installed around the outer periphery of the combustion chamber, and one end of the plurality of cooling channels is connected to the diversion cavity, and the other end is connected to the confluence cavity.

[0010] Furthermore, the cooling water enters the diversion cavity at the rear from the rear water-cooling pipe joint at the combustion chamber outlet, and then evenly passes through multiple cooling channels on the combustion chamber shell to cool the combustion chamber shell through flow distribution, and is finally discharged through the confluence cavity and the front water-cooling pipe joint at the front of the combustion chamber.

[0011] Furthermore, the igniter seat is used to install and fix the spark plug igniter, and is connected to the through hole on the combustion chamber shell.

[0012] Furthermore, the hydrogen outer cavity and the air inner cavity are coaxially arranged to form a fuel ring cavity, and the two are integrally formed by welding or 3D printing.

[0013] Furthermore, the nozzle body is positioned by bolting the flange plate to the flange seat.

[0014] Furthermore, the front parts of the air channel and the hydrogen connection channel pass through the through holes on the flange plate and are welded to the air intake pipe and the hydrogen intake pipe.

[0015] Furthermore, the fuel annular cavity is reduced to a hydrogen annular gap at the nozzle outlet.

[0016] Compared with the prior art, the heat conversion device for recycling industrial hydrogen-containing byproduct gas described in the present invention has the following beneficial effects:

[0017] 1. The present invention utilizes the connection position of the hydrogen outer cavity and the air inner cavity to form a coaxial nozzle structure of an outer hydrogen ring seam and a central air nozzle at the outlet, which can effectively organize the jet shear diffusion combustion of the hydrogen-containing byproduct gas and air, so that the hydrogen-containing byproduct gas can stably burn under high and low pressure conditions, and realize the recovery and reuse of the energy of the hydrogen-containing byproduct gas. At the same time, the internal contraction structure of the hydrogen outer cavity plays a throttling role in the supply of hydrogen-containing byproduct gas, which can convert part of the pressure potential energy of the gas into kinetic energy of the gas flow, increase the ejection speed of the byproduct gas, and then enhance the shear effect between it and the central air flow, which is more conducive to mixed combustion.

[0018] 2. In the combustion chamber of the present invention, low-pressure combustion of hydrogen-containing byproduct gas can be organized to utilize the thermal energy of high-temperature combustion gas, and high-pressure combustion of hydrogen-containing byproduct gas can be organized to utilize both the thermal energy and pressure potential energy of high-temperature and high-pressure combustion gas. At the same time, the water cooling system can also recycle the wall waste heat released by the combustion of hydrogen-containing byproduct gas.

[0019] 3. The device of the present invention has a compact layout, modular structure, and is easy to install. It can be flexibly adjusted according to the actual heat generation power demand by integrating a multi-nozzle structure. At the same time, the device has a wide range of application for flow rate pressure and high working stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of an energy-heat conversion system for recycling industrial hydrogen-containing byproduct gas according to the present invention;

[0022] Figure 2 is a cross-sectional view of the energy-heat conversion device of the present invention;

[0023] Figure 3 It is a three-dimensional structural diagram of the energy-heat conversion device of the present invention;

[0024] Figure 4 It is a partial enlarged view of the nozzle body of the present invention;

[0025] Among them: 1. Air intake pipe; 2. Hydrogen intake pipe; 3. Flange; 4. Flange seat; 5. Hydrogen outer cavity; 6. Air inner cavity; 7. Combustion chamber; 8. Front water-cooling pipe joint; 9. Converging cavity; 10. Cooling channel; 11. Diverter cavity; 12. Rear water-cooling pipe joint; 13. Ignitor seat; 14. Central air channel; 15. Fuel ring cavity; 16. Hydrogen ring seam; 17. Hydrogen connecting channel; 18-compressor, 19-air compressor, 20-nozzle body. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0027] See also Figure 1-4 This embodiment is described. A heat-energy conversion device for recycling industrial hydrogen-containing byproduct gas includes a hydrogen supply branch, an air supply branch and a heat-energy conversion device, wherein the hydrogen in the hydrogen supply branch comes from industrial byproduct gas containing a high proportion of hydrogen, and these hydrogen-rich industrial byproduct gases and air are pressurized by a compressor 18 and enter the heat-energy conversion device. The heat-energy conversion device includes an air intake pipe 1, the front of which is connected to the air supply branch, a hydrogen intake pipe 2, the front of which is connected to the hydrogen supply branch, a nozzle body 20, a combustion chamber 7, a water cooling system and an igniter seat 13, and hydrogen intake pipes 2 are installed on both sides of the air intake pipe 1. The two hydrogen intake pipes 2 are connected to the nozzle body 20, and the nozzle body is connected to the combustion chamber 7, and the combustion chamber 7 is equipped with a water cooling system and an igniter seat 13. The gas supplied by the two branches is injected into the combustion chamber 7 through the nozzle body 20 to organize coaxial diffusion combustion, and the heat generated can be used for heating or driving a small turbine to do work.

[0028] The nozzle body 20 includes a hydrogen outer cavity 5 and an air inner cavity 6. The hydrogen outer cavity 5 is located outside the air inner cavity 6. The hydrogen outer cavity 5 and the air inner cavity 6 are combined to form a fuel ring cavity 15. A central air channel 14 connected to the air intake pipe 1 is provided in the air inner cavity 6. Two hydrogen connecting channels 17 are circumferentially provided to connect to the hydrogen intake pipe 2. Air is introduced into the central air channel 14 of the nozzle body 20, and by-product gas is introduced into the fuel ring cavity 15, so that a coaxial shear airflow of by-product gas and air is formed in the combustion chamber 7.

[0029] The air intake pipe 1 and the hydrogen intake pipe 2 are both hollow curved tube structures to ensure a compact layout. The front parts are respectively connected to the air and hydrogen-containing byproduct gas supply systems, and a central air intake channel and byproduct gas side intake channels are formed inside to ensure uniform gas supply.

[0030] The hydrogen outer cavity 5 and the air inner cavity 6 are coaxially arranged to form a fuel ring cavity 15, and the two can be integrally formed by welding or 3D printing. The nozzle body 20 is positioned by bolting the flange 3 and the flange seat 4, and can be sealed with a graphite gasket. This assembly method is convenient for disassembly and assembly of the nozzle, and the corresponding nozzle structure can be adjusted and replaced according to the intake volume requirements. At the same time, the nozzle body 20 is provided with an air channel 14 and a hydrogen connection channel 17 for supplying a certain flow rate and pressure. The front of the two channels passes through the through hole on the flange 3 and is welded to the air intake pipe 1 and the hydrogen intake pipe 2.

[0031] The nozzle body 20 is provided with two hydrogen connection channels 17 for supplying by-product gas, and the by-product gas is sprayed out through the hydrogen annular gap 16 behind the fuel annular cavity 15 formed by the combination of the hydrogen outer cavity 5 and the air inner cavity 6 to ensure uniform gas supply. This gas supply method ensures the uniformity of the gas flow sprayed out of the by-product gas path, and the uniform annular air intake can make it better mixed with the central air flow, which is conducive to improving the combustion efficiency of the hydrogen-containing by-product gas.

[0032] Air is introduced into the central air passage 14 of the nozzle body 20 , and byproduct gas is introduced into the fuel ring cavity 15 , so that a coaxial shearing airflow of byproduct gas and air is formed in the combustion chamber 7 .

[0033] The byproduct gas and air ejected from the nozzle body 20 are organized into coaxial jet diffusion combustion in the combustion chamber 7 .

[0034] The fuel ring cavity 15 composed of the hydrogen outer cavity 5 and the air inner cavity 6 of the nozzle body 20 is reduced to a hydrogen ring gap 16 structure at the nozzle outlet, which increases the jet velocity of the hydrogen-containing byproduct gas and promotes its shear mixing and combustion with air. The velocity reaches the highest position at the position where the cross-sectional area of ​​the outlet hydrogen ring gap 16 is the smallest, and can reach the speed of sound at the highest. At this time, the intake flow rate of the byproduct gas also reaches the maximum. If the pressure and flow rate of the byproduct gas supply are continuously increased, the outlet flow rate of the hydrogen ring gap 16 of the nozzle body 20 will remain unchanged, reaching the upper limit of the nozzle flow rate. Therefore, the intake flow rate of a single nozzle body is limited due to the congestion of the outlet of the hydrogen outer cavity 5. Under the condition of a larger intake flow demand, a multi-nozzle intake structure can be used.

[0035] The size of the by-product gas and air outlets shall be designed according to the intake flow rate, pressure and injection speed ratio during actual use. The speed ratio shall be as high as possible while meeting the design flow rate and the outlet width of the hydrogen annular gap 16 is not too narrow, so as to enhance the shearing effect of the two jet gases, thereby shortening the combustion distance and achieving a better combustion effect of the hydrogen-containing by-product gas and air.

[0036] The air intake flow rate of the nozzle body 20 has an upper limit due to the limitation of the nozzle outlet velocity. When a larger air intake flow rate is required, a multi-nozzle air intake structure can be used.

[0037] The combustion chamber 7 is used to organize the shear mixing of the hydrogen-containing by-product gas and air with a certain speed difference ejected from the inner and outer cavities of the nozzle body, and because the nozzle body is a direct current nozzle structure, the two jet gases organize coaxial diffusion combustion in the combustion chamber 7. This combustion organization method can effectively prevent the backfire problem caused by hydrogen combustion and can achieve stable combustion of the hydrogen-containing by-product gas under high and low pressure conditions.

[0038] A water cooling system and an igniter seat 13 are installed on the shell of the combustion chamber 7. The water cooling system includes a front water cooling pipe joint 8, a confluence chamber 9, a cooling channel 10, a diversion chamber 11 and a rear water cooling pipe joint 12. A rear water cooling pipe joint 12 is installed at the outlet of the combustion chamber 7, and the rear water cooling pipe joint 12 is connected to the diversion chamber 11. A front water cooling pipe joint 8 is installed at the front of the combustion chamber 7, and the front water cooling pipe joint 8 is connected to the confluence chamber 9. A plurality of cooling channels 10 are axially installed on the outer periphery of the combustion chamber 7, and one end of the plurality of cooling channels 10 is connected to the diversion chamber 11, and the other end is connected to the confluence chamber 9.

[0039] The cooling water enters the diverter chamber 11 at the rear from the rear water cooling pipe joint 12 at the outlet of the combustion chamber 7, and then passes through the multiple cooling channels 10 on the combustion chamber 7 shell to cool the combustion chamber 7 shell evenly through the flow distribution, and finally is discharged through the confluence chamber 9 and the front water cooling pipe joint 8 at the front of the combustion chamber 7. The discharged hot water can also be used again in the heating system to realize the utilization of the heat of the combustion chamber 7 wall. The confluence chamber 9 is used to collect and hold the cooling water that flows out through the cooling channels 10, and the diverter chamber 11 is used to redistribute the collected cooling water to each cooling channel 10. The cooling water enters from the rear water cooling pipe joint 12, passes through the diverter chamber 11, the cooling channel 10, and the confluence chamber 9 in sequence, and is discharged through the front water cooling pipe joint 8 to reduce the temperature of the combustion chamber 7 shell.

[0040] The igniter seat 13 is used to install and fix the spark plug igniter, and is connected to the through hole on the shell of the combustion chamber 7. The electric spark generated by the spark plug ignites the entire by-product gas and air mixture.

[0041] The electric spark struck by the spark plug on the igniter seat 13 is as far as possible in the reflow zone to ensure that the entire mixture of byproduct gas and air can be successfully ignited and the ignition is successful.

[0042] The specific implementation process of the energy-heat conversion device of the present invention is as follows:

[0043] When in use, the air pressurized by the air compressor enters the air inner cavity 6 of the nozzle body through the air intake pipe 1, and then is sprayed into the combustion chamber 7 from the center of the nozzle. The industrial hydrogen-containing byproduct gas pressurized by the compressor enters the hydrogen outer cavity 5 of the nozzle body through the hydrogen intake pipe 2, and then is accelerated to be sprayed into the combustion chamber 7 from the hydrogen ring seam 16 outside the nozzle. The igniter extends into the combustion chamber 7 through the igniter seat 13 to break through the air to generate electric sparks, thereby igniting the mixture of hydrogen-containing byproduct gas and air. At the same time, the cooling water supply pipe is connected through the rear water cooling pipeline joint 12, and the cooling water enters the diversion cavity 11, and then the flow is evenly distributed through multiple cooling channels 10 and then collected into the confluence cavity 9, and finally discharged through the drain pipe connected to the front water cooling pipeline joint 8. The cooled hot water can also be passed into the heating system for use, realizing the waste heat recovery of the combustion chamber 7 wall.

[0044] The energy-heat conversion device provided in this embodiment has a compact structure, is easy to install and integrate, and can achieve efficient and stable combustion of industrial hydrogen-containing by-product gas under high and low pressure conditions. When used over a large area, it can effectively solve the problem of serious energy waste caused by the direct discharge of a large amount of industrial waste gas. The heat generated can be used again for heating or to drive small turbines, etc., thereby ensuring the rational use of resources.

[0045] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well.

Claims

1. An energy-heat conversion device for recycling industrial hydrogen-containing byproduct gas, characterized in that: The invention comprises an air intake pipe (1), two hydrogen intake pipes (2), a nozzle body (20), a combustion chamber (7) and a water cooling system, wherein the hydrogen intake pipes (2) are installed on both sides of the air intake pipe (1), the two hydrogen intake pipes (2) are connected to the nozzle body (20), the nozzle body (20) is connected to the combustion chamber (7), and the combustion chamber (7) is installed with a water cooling system and an igniter seat (13); The nozzle body (20) comprises a hydrogen outer cavity (5) and an air inner cavity (6), wherein the hydrogen outer cavity (5) is located outside the air inner cavity (6), and the hydrogen outer cavity (5) and the air inner cavity (6) are combined to form a fuel ring cavity (15). A central air channel (14) connected to an air intake pipe (1) is provided in the air inner cavity (6), and two hydrogen connecting channels (17) connected to the hydrogen intake pipe (2) are provided in the circumferential direction. Air is introduced into the central air channel (14) of the nozzle body (20), and byproduct gas is introduced into the fuel ring cavity (15), so that a coaxial shearing airflow of byproduct gas and air is formed in the combustion chamber (7).

2. The heat conversion device for recycling industrial hydrogen-containing byproduct gas according to claim 1 is characterized in that: The air intake pipe (1) is a hollow curved tube structure.

3. The heat conversion device for recycling industrial hydrogen-containing byproduct gas according to claim 1, characterized in that: The hydrogen inlet pipe (2) is a hollow curved tube structure.

4. The heat conversion device for recycling industrial hydrogen-containing byproduct gas according to claim 1, characterized in that: The water cooling system comprises a front water cooling pipe joint (8), a confluence chamber (9), a cooling channel (10), a diversion chamber (11) and a rear water cooling pipe joint (12); a rear water cooling pipe joint (12) is installed at the outlet of the combustion chamber (7); the rear water cooling pipe joint (12) is connected to the diversion chamber (11); a front water cooling pipe joint (8) is installed at the front of the combustion chamber (7); the front water cooling pipe joint (8) is connected to the confluence chamber (9); a plurality of cooling channels (10) are axially installed on the outer periphery of the combustion chamber (7); one end of the plurality of cooling channels (10) is connected to the diversion chamber (11) and the other end is connected to the confluence chamber (9).

5. The heat conversion device for recycling industrial hydrogen-containing byproduct gas according to claim 4, characterized in that: The cooling water enters the flow distribution chamber (11) at the rear portion from the rear water cooling pipe joint (12) at the outlet of the combustion chamber (7), and then evenly passes through the plurality of cooling channels (10) on the combustion chamber (7) shell to cool the combustion chamber (7) shell after flow distribution, and finally is discharged through the confluence chamber (9) at the front portion of the combustion chamber (7) and the front water cooling pipe joint (8).

6. The heat conversion device for recycling industrial hydrogen-containing byproduct gas according to claim 1, characterized in that: The igniter seat (13) is used for installing and fixing a spark plug igniter and is communicated with a through hole on the shell of the combustion chamber (7).

7. The heat conversion device for recycling industrial hydrogen-containing byproduct gas according to claim 1, characterized in that: The hydrogen outer cavity (5) and the air inner cavity (6) are coaxially arranged to form a fuel ring cavity (15), and the two are integrally formed by welding or 3D printing.

8. The heat conversion device for recycling industrial hydrogen-containing byproduct gas according to claim 1, characterized in that: The nozzle body (20) is positioned by bolting the flange (3) to the flange seat 4.

9. The heat conversion device for recycling industrial hydrogen-containing byproduct gas according to claim 8, characterized in that: The front parts of the air channel (14) and the hydrogen connection channel (17) pass through the through holes on the flange (3) and are welded to the air intake pipe (1) and the hydrogen intake pipe (2).

10. The heat conversion device for recycling industrial hydrogen-containing byproduct gas according to claim 1, characterized in that: The fuel annular cavity (15) is reduced to a hydrogen annular gap (16) at the nozzle outlet.

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