Online hydrogen production reforming device for hydrous ethanol

Abstract

A hydrous ethanol online hydrogen production reforming device comprises a transversely-arranged smoke pipe, the two ends of the pipe wall of the smoke pipe are correspondingly connected with a smoke inlet pipe and a smoke outlet pipe, the front end face of the smoke pipe is communicated with an alcohol liquid inlet connecting pipe, the rear end face of the smoke pipe is blocked by a pipe plate, and a smoke pipe flange is arranged on the outer pipe wall of the rear end of the smoke pipe. The smoke pipe flange is connected with an end cover through an end cover flange, a plurality of baffle plates used for prolonging the smoke walking distance are vertically and fixedly connected into the smoke pipe at intervals, a flow dividing bin is arranged in the smoke pipe at the front end of the smoke inlet pipe, a catalyst bin is arranged in the smoke pipe at the rear end of the smoke inlet pipe, and a distribution bin communicated with the alcohol liquid inlet connecting pipe is arranged in the flow dividing bin. The distribution bin is communicated with the shunting bin through a plurality of capillary tubes, the shunting bin is communicated with the catalyst bin through a plurality of small heat exchange tubes, the catalyst bin is communicated with the end cover through a plurality of large heat exchange tubes, and two ends of each large heat exchange tube are respectively connected with an outlet screen and an inlet screen. The reformer has the advantages of simple structure, light weight, high heat exchange efficiency, difficulty in blockage, high conversion efficiency and the like.

Description

Technical Field

[0001] This utility model relates to the technical field of mixed fuel preparation devices, specifically an online hydrogen production and reforming device for aqueous ethanol. Background Technology

[0002] To alleviate energy shortages and reduce environmental pollution, finding alternative energy sources and reducing harmful emissions have become two important topics in the field of internal combustion engine research. Hydrogen, with its diverse sources, renewable nature, and clean and environmentally friendly characteristics, has become a research hotspot in the current new energy field. As a highly efficient and clean energy source, hydrogen is considered one of the clean energy sources for solving the energy crisis of the 21st century. Especially with the development of fuel cells and new energy piston engines, the demand for hydrogen is gradually increasing.

[0003] Existing experimental and theoretical studies on hydrogen-blended engines have demonstrated the broad application prospects of hydrogen fuel in engines. However, issues such as hydrogen acquisition methods and storage and transportation technologies have hindered the practical adoption of hydrogen-blended engines. If inexpensive and renewable bioethanol could be used to replace hydrogen in vehicle transport, and the waste heat from engine exhaust could be used to reform the bioethanol into hydrogen for real-time hydrogen supply to the vehicle engine, it would undoubtedly provide a new approach and direction for the market promotion of hydrogen-blended combustion engines. Furthermore, on-board online hydrogen production eliminates the need for hydrogen storage and transportation, making the application and promotion of hydrogen fuel in engines possible.

[0004] Reformed gas, produced by catalytically converting aqueous ethanol using waste heat from automobile engines, is rich in H2, CH4, and CO. This reformed gas is highly suitable for engine combustion and can be used directly without any purification treatment. Existing reforming hydrogen production devices come in various forms, but research has found that they suffer from problems such as low heat exchange efficiency, large weight, susceptibility to clogging, and low conversion rate. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the prior art by providing an online hydrogen production and reforming device for aqueous ethanol. This device has advantages such as simple structure, light weight, high heat exchange efficiency, resistance to clogging, and high conversion efficiency.

[0006] This utility model is achieved using the following technical solution:

[0007] An online hydrogen production reforming device for aqueous ethanol, using 75% ethanol, includes a transversely arranged flue pipe. The two ends of the flue pipe are connected to a flue gas inlet pipe and a flue gas outlet pipe, respectively. The front end of the flue pipe is connected to an alcohol inlet pipe, and the rear end of the flue pipe is sealed with a tube sheet. A flue pipe flange is installed on the outer wall of the rear end of the flue pipe. The flue pipe flange is connected to an end cap that presses against the tube sheet via an end cap flange. The end cap flange is mounted on the end cap. Multiple baffles are vertically spaced and fixedly connected inside the flue pipe to extend the flue gas travel distance. The baffles are circular discs with portions cut off in a straight line, matching the inner diameter of the flue pipe. The multiple baffles alternately interact with the upper and lower pipe walls inside the flue pipe. The reformer employs a sealed connection, meaning it alternates between a sealed connection where the first baffle plate is not sealed to the upper pipe wall, and a sealed connection where the second baffle plate is not sealed to the lower pipe wall. A flow divider is located in the flue gas inlet pipe at the front end, and a catalyst chamber is located in the flue gas inlet pipe at the rear end. The catalyst chamber has a filling port for loading catalyst. A distribution chamber, connected to the alcohol inlet pipe, is located within the flow divider. The distribution chamber is connected to the flow divider via multiple capillary tubes. The flow divider is connected to the catalyst chamber via multiple small heat exchange tubes. The catalyst chamber is connected to the end cap via multiple large heat exchange tubes. An outlet screen is located at the connection point between the large heat exchange tubes and the end cap, and an inlet screen is located at the connection point between the large heat exchange tubes and the catalyst chamber. After the reformer is assembled, a sealing test is required. The outlet and inlet screens have a mesh diameter of 3mm and a center-to-center distance of 4mm.

[0008] A further preferred embodiment: the baffle plate and tube sheet at the rear end of the catalyst chamber are respectively provided with large heat exchange tube through holes for passing through the large heat exchange tube.

[0009] A further preferred embodiment: the baffle plate at the front end of the catalyst chamber is provided with a small heat exchange tube through hole for passing through the small heat exchange tube.

[0010] A further preferred embodiment: the multiple capillary tubes are symmetrically arranged in an equilateral triangle along the central reference axis of the flue tube; the number of small heat exchange tubes is equal to the number of capillary tubes, and they are arranged in a one-to-one correspondence, with the ends of the capillary tubes furthest from the distribution chamber extending into the small heat exchange tubes. Three adjacent small heat exchange tubes are arranged in an equilateral triangle, and three adjacent large heat exchange tubes are also arranged in an equilateral triangle.

[0011] This online hydrogen production reforming unit for aqueous ethanol improves heat exchange efficiency by vertically and at intervals connecting multiple baffles inside the flue pipe to extend the flue gas travel distance. A flow distribution chamber is installed at the front end of the flue gas inlet pipe, and a catalyst chamber is installed at the rear end of the flue gas inlet pipe, filled with catalyst to improve conversion efficiency. The flow distribution chamber contains a distribution chamber connected to the alcohol inlet pipe. The distribution chamber is connected to the flow distribution chamber via multiple capillary tubes, and the flow distribution chamber is connected to the catalyst chamber via multiple small heat exchange tubes. The catalyst chamber is connected to the end cap via multiple large heat exchange tubes. The arrangement of capillary tubes, flow distribution chamber, and small heat exchange tubes ensures a uniform supply of atomized aqueous ethanol to the catalyst chamber. The multiple large heat exchange tubes are less prone to clogging and eliminate the need for ceramic structures, reducing weight. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of an online hydrogen production reforming unit for aqueous ethanol.

[0013] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along the AA direction;

[0014] Figure 3 This is a schematic diagram of the tube sheet structure;

[0015] Figure 4 for Figure 3 A left-view diagram;

[0016] Figure 5 This is a schematic diagram of the baffle plate structure;

[0017] Figure 6 This is a schematic diagram of the capillary arrangement structure;

[0018] Figure 7 for Figure 6 A left-view diagram;

[0019] Figure 8 for Figure 7 A top-down view;

[0020] The component names corresponding to the serial numbers in the diagram are:

[0021] 1. Flue flange; 2. Flue; 3. Flue gas inlet pipe; 4. Alcohol inlet pipe; 5. Flue gas outlet pipe; 6. End cap; 7. Outlet screen; 8. Tube sheet; 9. End cap flange; 10. Large heat exchanger tube; 11. Baffle plate; 12. Inlet screen; 13. Catalyst compartment; 14. Small heat exchanger tube; 15. Flow divider; 16. Capillary tube; 17. Distribution compartment; 18. Large heat exchanger tube through hole. Detailed Implementation

[0022] The technical solutions of the invention will be clearly and completely described below with reference to the embodiments. The described embodiments are only a part of the present utility model, and not all of the embodiments. Example

[0023] An online hydrogen production reforming device for aqueous ethanol includes a transversely arranged flue pipe 2. The two ends of the flue pipe 2 are connected to a flue gas inlet pipe 3 and a flue gas outlet pipe 5, respectively. The front end of the flue pipe 2 is connected to an alcohol inlet pipe 4. The rear end of the flue pipe 2 is sealed with a tube sheet 8. A flue pipe flange 1 is installed on the outer wall of the rear end of the flue pipe 2. The flue pipe flange 1 is connected to an end cap 6 that presses against the tube sheet 8 via an end cap flange 9. The end cap flange 9 is mounted on the end cap 6. Multiple baffles 11 are vertically spaced and fixedly connected inside the flue pipe 2 to extend the flue gas travel distance. The baffles 11 are circular discs with a portion cut off in a straight line, matching the inner diameter of the flue pipe 2. The multiple baffles 11 are alternately and non-sealedly connected to the upper and lower tube walls inside the flue pipe 2. The first baffle plate 11 is not connected to the upper pipe wall in a sealed manner, and the second baffle plate 11 is not connected to the lower pipe wall in an alternating connection manner. A diversion chamber 15 is provided in the flue pipe 2 at the front end of the flue gas inlet pipe 3, and a catalyst chamber 13 is provided in the flue pipe 2 at the rear end of the flue gas inlet pipe 3. A distribution chamber 17 connected to the alcohol inlet pipe 4 is provided in the diversion chamber 15. The distribution chamber 17 is connected to the diversion chamber 15 through multiple capillary tubes 16. The diversion chamber 15 is connected to the catalyst chamber 13 through multiple small heat exchange tubes 14. The catalyst chamber 13 is connected to the end cap 6 through multiple large heat exchange tubes 10. An outlet screen 7 is provided at the connection end between the large heat exchange tubes 10 and the end cap 6, and an inlet screen 12 is provided at the connection end between the large heat exchange tubes 10 and the catalyst chamber 13.

[0024] Both the baffle plate 11 and the tube sheet 8 at the rear end of the catalyst chamber 13 are provided with large heat exchange tube through holes 18 for passing through the large heat exchange tube 10.

[0025] The catalyst chamber 13 has a baffle plate 11 at the front end with a small heat exchange tube through hole for passing through the small heat exchange tube 14.

[0026] The multiple capillary tubes 16 are arranged in an equilateral triangle, symmetrically along the central reference axis of the flue pipe 2. The number of small heat exchange tubes 14 is equal to the number of capillary tubes 16, and they are arranged in a one-to-one correspondence. The ends of the capillary tubes 16 that are away from the distribution chamber 17 extend into the small heat exchange tubes 14.

[0027] The working process of this online hydrogen production and reforming unit for aqueous ethanol is as follows: the exhaust gas from the engine enters the flue gas pipe 2 from the flue gas inlet pipe 3, is blocked and guided by the baffle plate 11, extending the travel distance, and finally discharged from the flue gas outlet pipe 5; the aqueous ethanol enters the distribution chamber 17 from the alcohol liquid inlet pipe 4, passes through the capillary tube 16 to the diversion chamber 15 and the small heat exchange tube 14 and is discharged, then enters the catalyst chamber 13 through the small heat exchange tube 14. The catalyst chamber 13 is pre-filled with particulate catalyst, and after contact with the catalyst, it enters the large heat exchange tube 10, is guided to the end cover 6 through the large heat exchange tube 10, and is discharged from the outlet set in the end cover 6. During the travel process, the flue gas exchanges heat with the small heat exchange tube 14 and the large heat exchange tube 10, heating the small heat exchange tube 14 and the large heat exchange tube 10 to realize the heating and catalytic cracking of aqueous ethanol. The gas produced by cracking is transported to the temporary storage tank to provide fuel for the engine.

[0028] The above description is not intended to limit the present utility model, nor is the present utility model limited to the above examples. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should be protected by the present utility model.

Claims

1. An online hydrogen reforming device for aqueous ethanol, comprising a transversely arranged flue pipe (2), wherein a flue gas inlet pipe (3) and a flue gas outlet pipe (5) are correspondingly connected to the pipe walls at both ends, characterized in that: The front end of the flue pipe (2) is connected to the alcohol inlet pipe (4), the rear end of the flue pipe (2) is sealed with a tube sheet (8), the outer wall of the rear end of the flue pipe (2) is provided with a flue pipe flange (1), the flue pipe flange (1) is connected to the end cap (6) of the tube sheet (8) through the end cap flange (9), there are multiple baffles (11) fixedly connected vertically at intervals inside the flue pipe (2) to extend the distance of flue gas travel, a diversion chamber (15) is provided in the flue pipe (2) at the front end of the flue gas inlet pipe (3), and a catalyst chamber (15) is provided in the flue pipe (2) at the rear end of the flue gas inlet pipe (3). 3) The distribution chamber (17) is connected to the alcohol inlet pipe (4) in the distribution chamber (15). The distribution chamber (17) is connected to the distribution chamber (15) through multiple capillary tubes (16). The distribution chamber (15) is connected to the catalyst chamber (13) through multiple small heat exchange tubes (14). The catalyst chamber (13) is connected to the end cap (6) through multiple large heat exchange tubes (10). The end of the large heat exchange tube (10) connected to the end cap (6) is provided with an outlet screen (7). The end of the large heat exchange tube (10) connected to the catalyst chamber (13) is provided with an inlet screen (12).

2. The aqueous ethanol on-line hydrogen generation reformer according to claim 1, characterized in that: Both the baffle (11) and the tube sheet (8) at the rear end of the catalyst chamber (13) are provided with large heat exchange tube through holes (18) for passing through the large heat exchange tube (10).

3. The online hydrogen production reforming apparatus for aqueous ethanol according to claim 1 or 2, characterized in that: The catalyst chamber (13) has a baffle plate (11) at the front end with a small heat exchange tube through hole for passing through the small heat exchange tube (14).

4. The aqueous ethanol on-line hydrogen generation reformer according to claim 1, characterized in that: The multiple capillary tubes (16) are symmetrical about the central reference axis of the flue (2) and arranged in an equilateral triangle. The number of small heat exchange tubes (14) is equal to the number of capillary tubes (16) and they are set in a one-to-one correspondence. The end of the capillary tube (16) away from the distribution chamber (17) extends into the small heat exchange tube (14).

5. The online hydrogen generation reformer of aqueous ethanol according to claim 1, characterized in that: The three adjacent large heat exchange tubes are arranged in an equilateral triangle.

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