Energy-saving methanol-to-hydrogen methanol evaporation system and process

Abstract

The invention discloses an energy-saving methanol-to-hydrogen methanol evaporation system and process, and relates to the technical field of new energy, the energy-saving methanol-to-hydrogen methanol evaporation system comprises a water tank and a circulating pump, the circulating pump is connected with a methanol evaporation device through a connecting pipe, the methanol evaporation device comprises an outer cylinder and a fin heat exchange pipe assembly, and an outlet of the fin heat exchange pipe assembly is connected with a steam generator and a solar device. The solar device water outlet is connected with the water tank. The energy-saving methanol-to-hydrogen methanol evaporation system and the energy-saving methanol-to-hydrogen methanol evaporation process are simple and easy to implement, low in investment cost, safe and convenient to operate, extremely small in environmental influence, very high in practicability and good in application prospect, are provided with double heating systems, and adopt negative-pressure low-temperature evaporation, so that the energy-saving methanol-to-hydrogen methanol evaporation system and the energy-saving methanol-to-hydrogen methanol evaporation process are environment-friendly. An energy-saving solar heat supply methanol heating system device and process are used as a main part, and when solar energy is insufficient, a steam generator heat supply methanol evaporation device and process are used as an auxiliary part.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to an energy-saving methanol evaporation system and process for producing hydrogen from methanol. Background Art

[0002] Hydrogen energy has a wide range of applications, mainly including power generation, power vehicles, fuel cells, etc. In the field of transportation, hydrogen vehicles have significant advantages as a complement to lithium-ion vehicles; in the field of energy storage, hydrogen energy is suitable for long-term, large-scale scenarios; in the industrial field, hydrogen energy can replace traditional fossil energy as fuel or chemical raw materials, which helps achieve carbon reduction goals.

[0003] The production of hydrogen by methanol cracking / reforming (MSR) has high research value. At present, the technology of methanol cracking / reforming (MSR) hydrogen production is mature and its application sites are diversified. It has become one of the mainstream technologies for hydrogen production. In the process of methanol hydrogen production, methanol evaporator is one of the main equipment. Traditional methanol evaporators are mainly based on direct electric heating or thermal oil heating evaporation, which has relatively high energy consumption. Summary of the invention

[0004] The purpose of the present invention is to provide an energy-saving methanol evaporation system and process for producing hydrogen from methanol, so as to solve the shortcomings of the methanol evaporation device in the existing methanol hydrogen production.

[0005] To achieve the above-mentioned purpose, the present invention provides an energy-saving methanol-to-hydrogen methanol evaporation system, comprising a water tank and a circulation pump, wherein the circulation pump is connected to a methanol evaporation device by a connecting pipe, and the methanol evaporation device comprises an outer cylinder and a fin heat exchange tube assembly, wherein the outlet of the fin heat exchange tube assembly is connected to a steam generator and a solar device, and the water outlet of the solar device is connected to the water tank.

[0006] Preferably, the outer cylinder is provided with a material inlet and outlet pipe and an air outlet, the air outlet is connected to a vacuum device, the vacuum device is provided with a vacuum pump methanol gas outlet and an adjustable exhaust port, and the vacuum device controls the vacuum degree 10 5 ~10 -1 pa.

[0007] Preferably, the steam generator is provided with inlet and outlet pipes, which are respectively connected to the steam generator inlet valve and the steam generator outlet valve. The medium of the steam generator is desalted water, which provides steam temperature control of 100-150°C.

[0008] Preferably, the solar device is provided with a water outlet pipe and a water inlet pipe, and the water inlet pipe is provided with a solar device inlet valve, which are respectively connected to the steam generator, the water tank and the methanol evaporation device to form a water circulation loop.

[0009] Preferably, the water tank is provided with a water inlet and a water outlet, the water outlet is connected to a circulation pump, and the water tank is provided with a liquid level gauge, a drain valve and a thermometer.

[0010] Preferably, the fin heat exchange tube assembly adopts fin tubes, the fin tubes and the outer cylinder are both made of 304 stainless steel, and the fin tubes are arranged in a serpentine coil.

[0011] Using solar evaporation, the evaporation process includes the following steps: S1. Pump methanol into the methanol feed port of the methanol evaporation device, and the liquid level is not lower than the fin heat exchange tube assembly; S2. Start the vacuum device. When the pressure gauge of the methanol evaporator reaches negative pressure, close the regulating exhaust port, open the methanol gas outlet of the vacuum pump, and control the vacuum degree to 10. 5 ~10 -1 pa; S3, close the steam generator inlet valve and steam generator outlet valve, open the circulation pump inlet valve, circulation pump outlet valve and solar device inlet valve, the solar device, water tank, circulation pump and fin heat exchange tube assembly water circuit is a circulation loop; S4, the solar device continuously supplies hot water, the finned heat exchange tube assembly heats the methanol, and the vacuum device controls the vacuum degree to 10 5 ~10 -1 pa, to evaporate methanol at a reduced pressure and low boiling point, and the produced methanol gas is sent to the methanol buffer storage device from the methanol gas outlet of the vacuum pump.

[0012] Using a steam generator for evaporation, the evaporation process includes the following steps: S1. Pump methanol into the methanol feed port of the methanol evaporation device, and the liquid level is not lower than the fin heat exchange tube assembly; S2. Start the vacuum device, and when the pressure gauge of the methanol evaporator reaches negative pressure, close the regulating exhaust port, open the methanol gas outlet of the vacuum pump, and control the vacuum degree; S3, opening the steam generator inlet valve and the steam generator outlet valve, closing the circulation pump inlet valve, the circulation pump outlet valve and the solar device inlet valve, and the water or water vapor pipeline in the steam generator and the fin heat exchange tube assembly is a circulation loop; S4, the steam generator continuously supplies hot water or steam, heats the methanol through the finned heat exchange tube assembly, and controls the vacuum degree to 10 under the vacuum device. 5 ~10 -1 pa, to carry out reduced pressure and low boiling point evaporation, and the produced methanol gas is sent to the methanol buffer storage device through the methanol gas outlet of the vacuum pump.

[0013] Therefore, the present invention adopts the above-mentioned energy-saving methanol evaporation system and process for producing hydrogen from methanol, which has the following beneficial effects: (1) The equipment is simple and easy to implement with low investment cost, safe and convenient operation, minimal environmental impact, and has strong practicality and good application prospects.

[0014] (2) The device has low cost, simple process, safe and convenient operation, and low-temperature evaporation below 64°C under a certain negative pressure, making full use of solar energy and energy-saving and efficient. At the same time, full consideration is given to using a steam generator for auxiliary heating when solar energy is insufficient to ensure that the methanol evaporator can operate continuously. At the same time, the use of solar energy and electric heating to evaporate methanol has minimal impact on the environment.

[0015] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of an energy-saving methanol evaporation system for producing hydrogen from methanol according to the present invention; Reference numerals 1. Solar device; 2. Water tank; 3. Water tank level gauge; 4. Drain valve; 5. Circulation pump inlet valve; 6. Water tank thermometer; 7. Circulation pump; 8. Circulation pump outlet valve; 9. Finned heat exchange tube assembly; 10. Methanol feed port; 11. Vacuum pump methanol gas outlet; 12. Vacuum device; 13. Adjustable exhaust port; 14. Methanol evaporator pressure gauge; 15. Methanol evaporation device; 16. Methanol evaporator level gauge; 17. Steam generator; 18. Solar device inlet valve; 19. Water tank water inlet; 20. Steam generator inlet valve; 21. Steam generator outlet valve. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0018] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0019] Example See also Figure 1The present invention provides an energy-saving methanol-to-hydrogen methanol evaporation system, comprising a water tank 2 and a circulation pump 7, the circulation pump 7 is connected to a methanol evaporation device by a connecting pipe, the methanol evaporation device comprises an outer cylinder and a fin heat exchange tube assembly 9, the outlet of the fin heat exchange tube assembly 9 is connected to a steam generator 17 and a solar device 1, and the water outlet of the solar device 1 is connected to the water tank 2.

[0020] The water tank 2 is provided with a water tank level gauge 3, a drain valve 4 and a water tank thermometer 6; the water tank 2 is provided with a water tank water inlet 19 and a circulating pump inlet valve 5, the circulating pump inlet valve 5 is connected to the circulating pump 7, and the other end of the circulating pump 7 is provided with a circulating pump outlet valve 8, and the circulating pump outlet valve 8 is connected to the pipeline.

[0021] The methanol evaporation device 15 is composed of an outer cylinder and a finned heat exchange tube assembly 9. The outer cylinder of the methanol evaporation device 15 is made of 304 stainless steel. The finned heat exchange tube assembly 9 uses finned tubes made of 304 stainless steel or other high-quality stainless steel, and is arranged in a serpentine coil. A methanol evaporator pressure gauge 14 and a methanol evaporator liquid level gauge 16 are provided on the cylinder of the methanol evaporator 15 . Material inlet and outlet pipes are provided on the cylinder of the methanol evaporator 15 , including a methanol feed port 10 . The methanol evaporator 15 is connected to the circulating pump 7 , the solar device 1 and the vacuum device 12 through pipes.

[0022] The vacuum device 12 is connected to the methanol evaporation device 15 by pipeline. The vacuum device 12 is provided with a vacuum pump methanol gas outlet 11 and an adjustable exhaust port 13. The vacuum device 12 controls the vacuum degree. 5 ~10 -1 pa, and evaporate methanol at a low boiling point under reduced pressure.

[0023] The solar device 1 is provided with a coil, the medium in the coil is water, the solar device 1 is provided with water inlet and outlet pipes, the water inlet pipe is provided with a solar device inlet valve 18, which is respectively connected to the steam generator 17, the water tank 2 and the methanol evaporation device 15 to form a water circulation loop.

[0024] The steam generator 17 is provided with an inlet and an outlet pipe, which are respectively connected to the steam generator inlet valve 20 and the steam generator outlet valve 21. The medium of the steam generator 17 is desalted water, which provides steam temperature control of 100-150°C.

[0025] The process part is as follows: When there is sufficient sunlight, solar energy is used for evaporation. The specific process is as follows: 1. Pump methanol into the methanol evaporation device 15 from the methanol feed port 10, and the liquid level is not lower than the fin heat exchange tube assembly 9; 2. Start the vacuum device 12. At the initial stage of startup, the exhaust port is discharged from the regulating exhaust port 13. When the pressure gauge 14 of the methanol evaporator reaches negative pressure, close the regulating exhaust port 13, open the vacuum pump methanol gas outlet 11, and control the vacuum degree 10.5 ~10 -1 pa; 3. Close the steam generator inlet valve 20 and the steam generator outlet valve 21, and open the circulation pump inlet valve 5, the circulation pump outlet valve 8, and the solar device inlet valve 18. Thus, the water circuit in the solar device 1, the water tank 2, the circulation pump 7, and the fin heat exchange tube assembly 9 forms a circulation loop; 4. The solar device 1 continuously supplies hot water to heat methanol through the finned heat exchange tube assembly 9. A certain vacuum degree is controlled under the vacuum device 12 to evaporate methanol at a low boiling point. The produced methanol gas is sent to the methanol buffer storage device through the vacuum pump methanol gas outlet 11, and then transported to the hydrogen production reactor to realize hydrogen production.

[0026] When there is insufficient sunlight or no sunlight, switch to the steam generator to heat and evaporate methanol. The specific process is as follows: 1. Methanol is pumped into the methanol feed port 10 in the methanol evaporation device 15, and the liquid level is not lower than the fin heat exchange tube assembly 9; 2. Start the vacuum device 12, and discharge the exhaust gas from the regulating exhaust port 13 at the initial stage of startup. When the pressure gauge 14 of the methanol evaporator reaches negative pressure, close the regulating exhaust port 13, open the methanol gas outlet 11 of the vacuum pump, and control a certain vacuum degree; 3. Open the steam generator inlet valve 20 and the steam generator outlet valve 21, and close the circulation pump inlet valve 5, the circulation pump outlet valve 8, and the solar device inlet valve 18. Thus, the water or water vapor pipeline in the steam generator 17 and the fin heat exchange tube assembly 9 is a circulation loop; 4. The steam generator 17 continuously supplies hot water or water vapor to heat methanol through the finned heat exchange tube assembly 9. A certain vacuum degree is controlled under the vacuum device 12 to evaporate methanol at a low boiling point. The methanol gas produced is sent to the methanol buffer storage device through the vacuum pump methanol gas outlet 11, and then transported to the hydrogen production reactor to realize hydrogen production.

[0027] Therefore, the present invention adopts the above-mentioned energy-saving methanol hydrogen production methanol evaporation system and process, the equipment is simple and easy to implement, the investment cost is low, the operation is safe and convenient, the environmental impact is minimal, and it has strong practicality and good application prospects. The device cost is low, the process is simple, the operation is safe and convenient, and the low temperature evaporation below 64°C under a certain negative pressure makes full use of solar energy, energy saving and high efficiency; at the same time, full consideration is given to using steam generator auxiliary heating when solar energy is insufficient to ensure that the methanol evaporator can operate continuously, and at the same time, solar energy and electric heating are used to evaporate methanol, and the environmental impact is minimal.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. An energy-saving methanol evaporation system for producing hydrogen from methanol, characterized by: It comprises a water tank and a circulation pump, wherein the circulation pump is connected to a methanol evaporation device via a connecting pipe, the methanol evaporation device comprises an outer cylinder and a fin heat exchange tube assembly, the outlet of the fin heat exchange tube assembly is connected to a steam generator and a solar device, and the water outlet of the solar device is connected to the water tank.

2. The energy-saving methanol evaporation system for producing hydrogen from methanol according to claim 1, characterized in that: The outer cylinder is provided with a material inlet and outlet pipe and an air outlet, the air outlet is connected to a vacuum device, the vacuum device is provided with a vacuum pump methanol gas outlet and an adjustable exhaust port, and the vacuum device controls the vacuum degree 10 5 ~10 -1 pa.

3. The energy-saving methanol evaporation system for producing hydrogen from methanol according to claim 2 is characterized in that: The steam generator is provided with inlet and outlet pipes, which are respectively connected to the steam generator inlet valve and the steam generator outlet valve. The medium of the steam generator is desalted water, which provides steam temperature control of 100-150°C.

4. The energy-saving methanol evaporation system for producing hydrogen from methanol according to claim 3 is characterized by: The solar device is provided with a water outlet pipe and a water inlet pipe. The water inlet pipe is provided with a solar device inlet valve, which are respectively connected with the steam generator, the water tank and the methanol evaporation device to form a water circulation loop.

5. The energy-saving methanol evaporation system for producing hydrogen from methanol according to claim 4 is characterized by: The water tank is provided with a water inlet and a water outlet, the water outlet is connected to a circulation pump, and the water tank is provided with a liquid level meter, a drain valve and a thermometer.

6. The energy-saving methanol evaporation system for producing hydrogen from methanol according to claim 5, characterized in that: The fin heat exchange tube assembly adopts fin tubes, the fin tubes and the outer cylinder are both made of 304 stainless steel, and the fin tubes are arranged in a serpentine coil.

7. An evaporation process, using the energy-saving methanol evaporation system for producing hydrogen from methanol as described in any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Pump methanol into the methanol feed port of the methanol evaporation device, and the liquid level is not lower than the fin heat exchange tube assembly; S2. Start the vacuum device. When the pressure gauge of the methanol evaporator reaches negative pressure, close the regulating exhaust port, open the methanol gas outlet of the vacuum pump, and control the vacuum degree to 10. 5 ~10 -1 pa; S3, close the steam generator inlet valve and steam generator outlet valve, open the circulation pump inlet valve, circulation pump outlet valve and solar device inlet valve, the solar device, water tank, circulation pump and fin heat exchange tube assembly water circuit is a circulation loop; S4, the solar device continuously supplies hot water, the finned heat exchange tube assembly heats the methanol, and the vacuum device controls the vacuum degree to 10 5 ~10 -1 pa, to evaporate methanol at a reduced pressure and low boiling point, and the produced methanol gas is sent to the methanol buffer storage device from the methanol gas outlet of the vacuum pump.

8. An evaporation process, using the energy-saving methanol evaporation system for producing hydrogen from methanol as described in any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Pump methanol into the methanol feed port of the methanol evaporation device, and the liquid level is not lower than the fin heat exchange tube assembly; S2. Start the vacuum device, and when the pressure gauge of the methanol evaporator reaches negative pressure, close the regulating exhaust port, open the methanol gas outlet of the vacuum pump, and control the vacuum degree; S3, opening the steam generator inlet valve and the steam generator outlet valve, closing the circulation pump inlet valve, the circulation pump outlet valve and the solar device inlet valve, and the water or water vapor pipeline in the steam generator and the fin heat exchange tube assembly is a circulation loop; S4, the steam generator continuously supplies hot water or steam, heats the methanol through the finned heat exchange tube assembly, and controls the vacuum degree to 10 under the vacuum device. 5 ~10 -1 pa, to carry out reduced pressure and low boiling point evaporation, and the produced methanol gas is sent to the methanol buffer storage device through the methanol gas outlet of the vacuum pump.

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