Working device for integrated methanol reforming hydrogen production

Abstract

The invention relates to the field of methanol hydrogen production, and discloses an integrated methanol reforming hydrogen production working device which comprises a shell, and a fuel supply system, a vaporizer, a reforming reactor, a catalytic oxidation combustor, an ignition device, a heat exchange network and a control module are integrated in the shell. The concentric pipe is embedded in a barrel of the catalytic oxidation combustor; a plurality of igniters are distributed on the outer side of the top end of the concentric tube in the circumferential direction, a heating resistance wire is embedded in the inner side wall of the concentric tube in a surrounding mode, and a carbon deposit removing module is arranged on the inner side wall of the concentric tube and used for removing carbon deposits generated due to insufficient combustion and attached to the inner side wall of the concentric tube; multiple igniters can be used for simultaneous multi-time ignition, and the problem of subsequent carbon deposition caused by insufficient combustion efficiency due to repeated multi-time ignition is solved; and meanwhile, the heating resistance wire is used for preheating the whole concentric tube inner area, the ignition success rate is comprehensively increased, and carbon deposition is reduced.

Description

Technical Field

[0001] The present invention relates to the field of methanol hydrogen production, and in particular to a working device for integrated methanol reforming hydrogen production. Background Art

[0002] Methanol reforming is a technology that converts methanol and water into a hydrogen-rich mixture through a chemical reaction. This process typically occurs in the temperature range of 200°C to 450°C over a specific catalyst. Because it is a highly endothermic reaction, continuous heat must be supplied to maintain the reaction temperature. An integrated methanol reforming hydrogen production plant typically includes the following core units: Fuel / raw material supply system: methanol water tank, water pump, methanol pump, mixer / preheater. The mixer / preheater is used to mix and preheat the methanol-water solution in proportion.

[0003] Vaporizer: converts liquid methanol-water solution into gas.

[0004] Reforming reactor: A core component equipped with a catalyst where gaseous methanol and water vapor undergo a reforming reaction to produce hydrogen-rich gas; an external heat source is required for heating.

[0005] Catalytic oxidation burner: provides the heat required for the reforming reaction, usually burning a portion of the methanol to produce high-temperature flue gas or directly heating the reactor wall / heat pipe.

[0006] Ignition device: used to reliably ignite the fuel in the catalytic oxidation burner and start the entire heating process.

[0007] Heat exchange network: Recycle and utilize the waste heat of reforming products and combustion flue gas to preheat raw materials, vaporize liquids, preheat combustion air, etc., to improve system efficiency.

[0008] Control system: monitors and controls key parameters such as temperature, pressure, flow, etc. to ensure safe and stable operation of the system, including the control logic of the ignition process.

[0009] In existing methanol reforming hydrogen production devices, methanol has a high latent heat of vaporization, is relatively less volatile than gasoline, and its vapor is not easily ignited directly by the ignition device at normal temperature and pressure. During cold start, due to the low ambient temperature, the methanol evaporation rate is slow, making it difficult to quickly form a combustible mixture in the ignition area; and liquid methanol that is incompletely burned or poorly evaporated at low temperatures is prone to coking and carbon deposits on the igniter surface, nozzle or combustion chamber wall, clogging the channel, affecting subsequent ignition and combustion efficiency, and even damaging components. Summary of the Invention

[0010] The object of the present invention is to provide a working device for integrated methanol reforming to produce hydrogen, so as to solve the above technical problems.

[0011] The purpose of the present invention can be achieved through the following technical solutions: A working device for integrated methanol reforming hydrogen production includes a housing, in which a fuel supply system, a vaporizer, a reforming reactor, a catalytic oxidation burner, an ignition device, a heat exchange network, and a control module are integrated. The ignition device includes: Concentric tubes are embedded in the cylinder of the catalytic oxidation burner; multiple igniters are distributed circumferentially on the outer side of the top of the concentric tube, a heating resistance wire is embedded around the inner wall of the concentric tube, and a carbon deposit removal module is provided on the inner wall of the concentric tube to remove carbon deposits attached to the inner wall of the concentric tube due to incomplete combustion.

[0012] As a further technical solution, the carbon deposit removal module includes an annular scraper assembly and a telescopic assembly. The annular scraper assembly is arranged concentrically with the concentric tube and can be displaced up and down along the concentric tube; an outer cylinder is provided on the outside of the concentric tube, and the outer cylinder is fixed on the catalytic oxidation burner. The telescopic assembly is arranged on the outer cylinder, and the annular scraper assembly is driven to move up and down by the telescopic assembly. During the cleaning process, the igniter is retracted into the through groove through the automatic telescopic rod.

[0013] As a further technical solution, the telescopic assembly includes an automatic telescopic rod, one end of which is connected to the igniter, and the other end is fixed to the outer tube. A guide block is fixed to the outside of the igniter, and a through groove corresponding to the igniter is opened on the concentric tube. A guide groove portion is fixed on the side of the through groove facing the outer tube, and the guide block is slidably connected in the guide groove portion. The automatic telescopic rod is electrically connected to the control module.

[0014] As a further technical solution, the annular scraper assembly includes an annular scraper, a fireproof retaining ring is provided on the top of the annular scraper, and a blade is provided on the bottom. The blade is closely attached to the inner wall of the concentric tube. The inner diameter of the fireproof retaining ring is gradually reduced from top to bottom. The fireproof retaining ring serves as a counterweight for the annular scraper. A lifting ring is provided on the top of the annular scraper, one end of a lifting rope is fixed on the lifting ring, and the other end passes around the guide wheel and is fixed to the tail of the igniter.

[0015] As a further technical solution, a surrounding sealing groove is provided on the inner wall of the through groove, and a C-shaped metal elastic sealing ring is embedded in the surrounding sealing groove, and the inner lip of the metal elastic sealing ring is tightly fitted with the outer wall of the igniter; A corrugated spring is arranged between the inner side of the surrounding sealing groove and the outer side of the metal elastic sealing ring, and the outer side of the metal elastic sealing ring is pre-tightened by the corrugated spring.

[0016] As a further technical solution, an air cavity is provided on one side of the guide groove portion near the through groove, and the air cavity is provided with an outlet, which is inclined at 30° to 45° toward the center of the through groove. The air cavity is connected to a micro air pump through an air pipe to inject pressurized inert gas to form an air curtain barrier, which is used to prevent carbon deposits from overflowing the through groove; the micro air pump is arranged inside the housing and electrically connected to the control module; The outer surface of the igniter is processed with spiral micro-grooves. When the igniter is extended or retracted, the spiral grooves drive the carbon deposits to move toward the air curtain barrier, achieving dynamic cleaning under the action of the air curtain barrier.

[0017] As a further technical solution, a V-shaped concentrating groove is provided in the bottom area between the outer cylinder and the inner cylinder, and a carbon deposit return channel is opened on the side wall of the outer shell. The carbon deposit return channel is connected to the bottom of the concentrating groove and the bottom of the concentric tube. A screw conveyor is provided in the carbon deposit return channel to transport the collected carbon deposit attachments out of the shell.

[0018] Beneficial effects of the present invention: (1) In the present invention, methanol and air are ignited when they pass upward through the ignition area formed by multiple igniters. Compared with the use of a single igniter, multiple igniters can ignite multiple times at the same time, and the ignition success rate can be greatly improved, thereby reducing the subsequent carbon deposition problem caused by insufficient combustion efficiency due to repeated ignition; at the same time, the heating resistance wire is used to preheat the entire concentric tube area, thereby reducing the adverse effects caused by direct starting in a low-temperature environment, comprehensively improving the ignition success rate, and reducing the generation of carbon deposits.

[0019] (2) The present invention cooperates with the annular scraper assembly and the telescopic assembly to form a telescopic assembly that drives the igniter to contract, while allowing the annular scraper assembly to move downward to remove carbon deposits on the inner wall of the concentric tube. It can also avoid the interference of the igniter on the operation of the annular scraper assembly; when the igniter is reset, the annular scraper assembly is again at the top of the concentric tube, and through the above-mentioned periodic cycle, the carbon deposits are effectively removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 is a schematic diagram of the housing of the present invention; Figure 2 It is a structural schematic diagram of the ignition device of the present invention; Figure 3 for Figure 2 Schematic diagram of part of the structure; Figure 4 Schematic diagram of the structure of the annular scraper assembly; Figure 5 It is a structural diagram of the telescopic component; Figure 6Schematic diagram of the structure of the air cavity and spiral microgroove; Figure 7 It is a schematic diagram of the structure surrounding the sealing groove.

[0022] Description of the drawings: 1. Shell; 2. Concentric tube; 3. Cylinder; 4. Ignitor; 5. Heating resistance wire; 6. Carbon deposit removal module; 61. Telescopic assembly; 611. Automatic telescopic rod; 612. Guide block; 613. Guide groove; 62. Annular scraper assembly; 621. Annular scraper; 622. Fireproof retaining ring; 623. Lifting ring; 624. Lifting rope; 7. Outer cylinder; 8. Through groove; 81. Surrounding sealing groove; 82. Metal elastic sealing ring; 83. Corrugated spring; 9. Air cavity; 10. Spiral micro groove; 11. Concentrating groove; 12. Carbon deposit return channel. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] See also Figure 1-Figure 7 As shown, the present invention is a working device for integrated methanol reforming hydrogen production, including a housing 1, in which a fuel supply system, a vaporizer, a reforming reactor, a catalytic oxidation burner, an ignition device, a heat exchange network and a control module are integrated. The ignition device includes: Concentric tube 2, the concentric tube 2 is embedded in the cylinder 3 of the catalytic oxidation burner; a plurality of igniters 4 are distributed circumferentially on the outer side of the top end of the concentric tube 2, a heating resistance wire 5 is embedded around the inner wall of the concentric tube 2, and a carbon deposit removal module 6 is provided on the inner wall of the concentric tube 2 for removing carbon deposits attached to the inner wall of the concentric tube 2 due to incomplete combustion.

[0025] The connections of the fuel supply system, vaporizer, reforming reactor, catalytic oxidation burner, ignition device, heat exchange network and control module integrated in the present invention all adopt existing mature solutions. The specific location and connection method are not the content to be protected by the present invention and are therefore not described; The problem to be solved by the present invention is that when the igniter 4 is started at a low temperature during hydrogen production by methanol reforming, the methanol combustion efficiency is insufficient and carbon deposits are generated, which hinders subsequent full combustion and causes adverse consequences due to continuous deterioration. Therefore, in the catalytic oxidation combustor, methanol and air are introduced into the bottom of the concentric tube 2 according to a preset ratio, and when the methanol and air pass through the ignition area composed of multiple igniters 4 upwards, ignition is performed. Compared with using a single igniter 4, multiple igniters 4 can simultaneously ignite multiple times, the ignition success rate can be greatly improved, thereby reducing the subsequent carbon deposition problem caused by insufficient combustion efficiency due to repeated multiple ignitions; at the same time, the entire inner area of the concentric tube 2 is preheated by using the heating resistance wire 5, thereby reducing the adverse effects caused by directly starting in a low-temperature environment, and comprehensively improving the ignition success rate to reduce the generation of carbon deposition; and in order to reduce the influence of carbon deposition on the catalytic oxidation combustor and the ignition device, a carbon deposition removal module 6 is arranged, which, in use, forms a telescopic assembly 61 driving the igniter 4 to retract while the annular scraper assembly 62 moves downward to remove the carbon deposition on the inner side wall of the concentric tube 2, and can also avoid the interference of the igniter 4 on the operation of the annular scraper assembly 62; when the igniter 4 is reset, the annular scraper assembly 62 is repositioned at the top of the concentric tube 2, and through the above periodic cycle, the carbon deposition is effectively removed.

[0026] The carbon deposition removal module 6 includes an annular scraper assembly 62 and a telescopic assembly 61. The annular scraper assembly 62 is arranged concentrically with the concentric tube 2 and can be displaced up and down along the concentric tube 2. An outer cylinder 7 is arranged outside the concentric tube 2 and is fixed on the catalytic oxidation combustor. The telescopic assembly 61 is arranged on the outer cylinder 7 and drives the annular scraper assembly 62 to move up and down. The igniter 4 is retracted into the through slot 8 by the automatic telescopic rod 611 during the removal process.

[0027] The telescopic assembly 61 includes an automatic telescopic rod 611. One end of the automatic telescopic rod 611 is connected with the igniter 4, and the other end is fixed on the outer cylinder 7. A guide block 612 is fixedly sleeved outside the igniter 4. A through slot 8 corresponding to the igniter 4 is arranged on the concentric tube 2. A guide groove part 613 is fixedly arranged on the side of the through slot 8 facing the outer cylinder 7. The guide block 612 is slidably connected in the guide groove part 613. The automatic telescopic rod 611 is electrically connected with a control module.

[0028] In the present invention, a specific embodiment of a telescopic component 61 is provided. When in use, it is started by an automatic telescopic rod 611 such as pneumatic, hydraulic or electric, and multiple automatic telescopic rods 611 are synchronously telescopically moved, thereby driving the connected igniters 4 to synchronously enter and exit the through slot 8. However, this is only when the igniter 4 exits the through slot 8, that is, when the diameter of the circle formed by the top ends of multiple igniters 4 is larger than the inner diameter of the concentric tube 2, it means that the igniter 4 at this time has completely avoided the possibility of interference with the annular scraper assembly 62. At this time, the igniter 4 continues to move outward, and the annular scraper assembly 62 will smoothly cross the through slot 8 area and remove carbon deposits from the lower part of the concentric tube 2; when the igniter 4 is reset, the annular scraper assembly 62 also smoothly returns to the top, and this can be repeated many times to achieve periodic removal of carbon deposits to maintain efficient combustion of methanol; in addition, the igniter 4 that can move in and out can obviously reduce the corresponding installation difficulty and is more convenient for maintenance personnel.

[0029] The annular scraper assembly 62 includes an annular scraper 621. A fireproof retaining ring 622 is provided on the top of the annular scraper 621, and a knife edge is provided on the bottom. The knife edge is closely attached to the inner wall of the concentric tube 2. The inner diameter of the fireproof retaining ring 622 is gradually reduced from top to bottom. The fireproof retaining ring 622 serves as a counterweight for the annular scraper 621. A lifting ring 623 is provided on the top of the annular scraper 621, one end of a lifting rope 624 is fixed on the lifting ring 623, and the other end is passed around the guide wheel and fixed to the tail of the igniter 4. The lifting rope 624 is made of a high temperature resistant metal such as a nickel-based alloy braided soft chain.

[0030] The present invention provides a specific embodiment of the annular scraper assembly 62. When in use, when the igniter 4 exits the inner cavity of the concentric tube 2, the suspension rope 624 loses its original traction force. Therefore, under the counterweight of the fireproof retaining ring 622, it drops rapidly until it passes over the area where the igniter 4 is located and vertically drops to the bottom of the concentric tube 2. Through the straight up and down reciprocating action, gravity can be used as the power source of the annular scraper 621, so as to reduce the structural complexity of the annular scraper assembly 62, while taking into account the carbon deposit removal effect. At the same time, the structural complexity is reduced, and the difficulty of maintenance and manufacturing is increased; and the fireproof retaining ring 622 is used as the power source of the annular scraper 621. The top of the ring 622 is welded and fixed to the top of the annular scraper 621, and the bottom is flush with the blade of the annular scraper 621. On the one hand, it can increase the counterweight of the annular scraper 621, increase the force to remove carbon deposits, and improve the carbon deposit removal effect; on the other hand, the fireproof baffle ring 622 is a metal cone with a gradually decreasing inner diameter, so that the combustion airflow is forced to form a centripetal vortex under the cone structure, thereby inhibiting the scraped carbon deposit particles from being driven by the rising hot air flow, resulting in the problem of secondary attachment of carbon deposits; in addition, it can block high-temperature radiation from the structure of the hanging ring 623 to protect the upper suspension mechanism and extend its service life.

[0031] The inner wall of the through groove 8 is provided with a surrounding sealing groove 81, and a metal elastic sealing ring 82 of a C-shaped structure is embedded in the surrounding sealing groove 81. The inner lip of the metal elastic sealing ring 82 is tightly fitted with the outer wall of the igniter 4; A corrugated spring 83 is provided between the inner side of the surrounding sealing groove 81 and the outer side of the metal elastic sealing ring 82, and the outer side of the metal elastic sealing ring 82 is pre-tightened by the corrugated spring 83. In the present invention, the C-shaped metal elastic sealing ring 82 is embedded in the surrounding sealing groove 81 of the through groove 8. Under the continuous pre-tightening force of the corrugated spring 83, its inner lip is always tightly attached to the outer wall of the igniter 4; when the igniter 4 is retracted or extended under the drive of the automatic telescopic rod 611, the C-shaped structure of the metal sealing ring undergoes elastic deformation, and cooperates with the compensation effect of the corrugated spring 83 to dynamically adapt to the displacement and thermal expansion changes of the igniter 4, thereby forming a reliable seal and preventing unburned methanol or high-temperature gas from leaking through the gap of the through groove 8 to the mechanical component area; secondly, the low friction characteristics of the C-shaped structure combined with the buffering effect of the corrugated spring 83 can reduce the wear of the igniter 4 during reciprocating motion and improve its service life.

[0032] An air cavity 9 is formed on one side of the guide groove portion 613 near the through groove 8. The air cavity 9 is provided with an outlet, which is inclined at 30° to 45° toward the center of the through groove 8. The air cavity 9 is connected to a micro air pump via an air pipe to inject pressurized inert gas to form an air curtain barrier, which is used to prevent carbon deposits from overflowing the through groove 8. The inert gas can be nitrogen. The micro air pump is disposed inside the housing and is electrically connected to the control module. The outer surface of the igniter 4 is processed with spiral micro grooves 10. When the igniter 4 is extended or retracted, the spiral grooves drive the carbon deposits to move toward the air curtain barrier, thereby achieving dynamic cleaning under the action of the air curtain barrier.

[0033] In the present invention, nitrogen is injected into the air cavity 9 of the guide groove portion 613 through a micro air pump, and the gas forms a conical air curtain barrier through an outlet inclined at 30° to 45° to cover the through groove 8 area; at this time, the igniter 4 is retracting through the automatic telescopic rod 611, and the spiral microgrooves 10 processed on its surface push the carbon deposit particles attached to the surface of the igniter 4 to the center of the through groove 8 like a screw conveyor; when the carbon deposit particles enter the air curtain action area, the inclined airflow produces two key effects: one is to use the Venturi effect to form a negative pressure area at the edge of the air curtain, actively sucking away the escaping particles; the other is that the high-speed inert airflow carries the particles along a preset angle and shoots them toward the high-temperature zone of the combustion zone, so that the particles are completely burned and oxidized, thereby forming a double protection with the metal elastic sealing ring 82, that is, the metal sealing ring blocks large particles from entering the mechanical gap, and the air curtain captures micron-sized residues.

[0034] A V-shaped concentrating groove 11 is provided in the bottom area between the outer cylinder 7 and the inner cylinder, and a carbon deposit return channel 12 is opened on the side wall of the outer shell. The carbon deposit return channel 12 is connected with the bottom of the concentrating groove 11 and the bottom of the concentric tube 2. A screw conveyor is provided in the carbon deposit return channel 12 to transport the collected carbon deposit attachments out of the shell 1 to realize carbon deposit output.

[0035] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A working device for integrated methanol reforming hydrogen production, comprising a housing, in which a fuel supply system, a vaporizer, a reforming reactor, a catalytic oxidation burner, an ignition device, a heat exchange network and a control module are integrated, characterized in that: The ignition device includes: Concentric tubes are embedded in the cylinder of the catalytic oxidation burner; multiple igniters are distributed circumferentially on the outer side of the top of the concentric tube, a heating resistance wire is embedded around the inner wall of the concentric tube, and a carbon deposit removal module is provided on the inner wall of the concentric tube to remove carbon deposits attached to the inner wall of the concentric tube due to incomplete combustion.

2. The integrated methanol reforming hydrogen production device according to claim 1, characterized in that: The carbon deposit removal module includes an annular scraper assembly and a telescopic assembly. The annular scraper assembly is arranged concentrically with the concentric tube and can move up and down along the concentric tube; an outer cylinder is provided on the outside of the concentric tube, and the outer cylinder is fixed on the catalytic oxidation burner. The telescopic assembly is arranged on the outer cylinder, and the annular scraper assembly is driven to move up and down by the telescopic assembly. During the cleaning process, the igniter is retracted into the through groove through the automatic telescopic rod.

3. The integrated methanol reforming hydrogen production device according to claim 2, characterized in that: The telescopic assembly includes an automatic telescopic rod, one end of which is connected to the igniter, and the other end is fixed to the outer tube. A guide block is fixed to the outside of the igniter, and a through groove corresponding to the igniter is opened on the concentric tube. A guide groove portion is fixed on the side of the through groove facing the outer tube, and the guide block is slidably connected in the guide groove portion. The automatic telescopic rod is electrically connected to the control module.

4. The working device for integrated methanol reforming to produce hydrogen according to claim 3, characterized in that: The annular scraper assembly includes an annular scraper, a fireproof retaining ring is provided on the top of the annular scraper, and a knife edge is provided on the bottom. The knife edge is closely attached to the inner wall of the concentric tube. The inner diameter of the fireproof retaining ring is gradually reduced from top to bottom. The fireproof retaining ring serves as a counterweight for the annular scraper. A lifting ring is provided on the top of the annular scraper, one end of a lifting rope is fixed on the lifting ring, and the other end passes around the guide wheel and is fixed to the tail of the igniter.

5. The integrated methanol reforming hydrogen production device according to claim 4, characterized in that: A surrounding sealing groove is provided on the inner wall of the through groove, and a metal elastic sealing ring with a C-shaped structure is embedded in the surrounding sealing groove. The inner lip of the metal elastic sealing ring fits tightly with the outer wall of the igniter; A corrugated spring is arranged between the inner side of the surrounding sealing groove and the outer side of the metal elastic sealing ring, and the outer side of the metal elastic sealing ring is pre-tightened by the corrugated spring.

6. The integrated methanol reforming hydrogen production device according to claim 5, characterized in that: An air cavity is opened on one side of the guide groove close to the through groove, and the air cavity is provided with an outlet, which is inclined 30° to 45° toward the center of the through groove. The air cavity is connected to a micro air pump through an air pipe to pressurize and inject inert gas to form an air curtain barrier, which is used to prevent carbon deposits from overflowing the through groove; the micro air pump is arranged inside the shell and electrically connected to the control module.

7. The integrated methanol reforming hydrogen production device according to claim 1, characterized in that: The outer surface of the igniter is processed with spiral micro-grooves. When the igniter is extended or retracted, the spiral grooves drive the carbon deposits to move toward the air curtain barrier, achieving dynamic cleaning under the action of the air curtain barrier.

8. The integrated methanol reforming hydrogen production device according to claim 1, characterized in that: A V-shaped concentrating groove is provided in the bottom area between the outer cylinder and the inner cylinder, and a carbon deposit return channel is opened on the side wall of the outer shell. The carbon deposit return channel is connected with the bottom of the concentrating groove and the bottom of the concentric tube. A screw conveyor is provided in the carbon deposit return channel to transport the collected carbon deposit attachments out of the shell.

Images