Methanol hydrogen production device

Abstract

The utility model discloses a methanol hydrogen production device which comprises a steam vaporization tank, a cracking reaction tank and a cooler which are connected in sequence, the steam vaporization tank comprises an outer container and an inner container arranged in the middle of the outer container in a sleeved mode, the inner container is used for containing heating media, and a heating pipe is arranged in the inner container; a methanol containing cavity is defined between the inner container and the outer container; and a steam outlet pipe is arranged at the top of the side wall of the outer container. The steam vaporization tank is of a double-layer structure, heat conduction oil is arranged in an inner container and is half-filled, methanol gas is arranged on the upper portion between the inner container and the outer container, liquid is arranged on the lower portion between the inner container and the outer container and is uniformly vaporized into methanol steam, gas on the upper portion is overheated and enters the cracking reaction tank, the cracking reaction tank is provided with a plurality of steel pipes filled with catalysts, and the methanol steam is long in gas path and is uniformly cracked into mixed hydrogen under the action of the catalysts.

Description

Technical Field

[0001] The utility model belongs to the technical field of new energy hydrogen production, and particularly relates to a methanol hydrogen production device. Background Art

[0002] The statements here only provide the background art related to the utility model, and do not necessarily constitute the prior art.

[0003] At present, the main hydrogen production methods include hydrogen production by the reaction of steam and hydrogen production catalyst, hydrogen production by fossil fuel reforming, hydrogen production by electrolyzing water, hydrogen production by photolysis of water, biological hydrogen production, and plasma hydrogen production, etc.

[0004] Currently, methanol is widely used to produce hydrogen. Methanol hydrogen production means that under certain temperature and pressure conditions, with a methanol solution as the raw material, the methanol solution generates methanol vapor after being heated, and then the methanol vapor undergoes a conversion reaction under the action of a hydrogen production catalyst, ultimately achieving the purpose of producing hydrogen.

[0005] In the prior art, the main method for preparing methanol vapor is to heat the methanol solution with an electric heating tube to finally obtain methanol vapor. However, methanol often contains methanol in two states, gas and liquid. Therefore, when heating methanol by combustion catalysis, the methanol is unevenly heated, resulting in a reduction in the vaporized methanol vapor. At the same time, in the cracking reaction, the methanol vapor has a short path, the catalyst is unevenly heated, and the cracking reaction is incomplete. In addition, during the heating process, the heat in the combustion exhaust gas cannot be fully utilized, ultimately reducing the efficiency of preparing mixed hydrogen and increasing energy consumption. Summary of the Utility Model

[0006] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a methanol hydrogen production device.

[0007] To achieve the above purpose, the utility model is realized through the following technical solutions:

[0008] The utility model provides a methanol hydrogen production device, which includes a vaporization tank, a cracking reaction tank, and a cooler connected in sequence. Among them,

[0009] The vaporization tank includes an outer tank and an inner tank sleeved in the middle of the outer tank. The inner tank is used to hold a heating medium, and a heating tube is arranged inside the inner tank. A methanol holding chamber is formed between the inner tank and the outer tank. A methanol inlet pipe is arranged at the bottom of the side wall of the outer tank, and a vapor outlet pipe is arranged at the top.

[0010] In the vaporization tank of the utility model, an inner tank and an outer tank are provided. The inner tank is arranged in the middle of the outer tank. The inner tank holds a heating medium and is provided with a heating tube. The heating tube is used to uniformly heat the heating medium, and then the methanol between the inner tank and the outer tank can be heated.

[0011] Since the inner tank is arranged in the middle of the outer tank, that is, the thickness of the methanol liquid layer surrounding the inner tank is uniform, the heating uniformity of methanol can be improved accordingly.

[0012] In some embodiments, both the inner tank and the outer tank are of cylindrical structures, and the inner tank is arranged covering the effective height direction of the outer tank.

[0013] The effective height of the outer tank here refers to the maximum height that the outer tank can hold methanol, that is, methanol always exists between the inner tank and the outer tank, and both the inner tank and the outer tank are of cylindrical structures, thus ensuring that the thickness of the methanol liquid layer is uniform and can preferably ensure the heating uniformity of methanol.

[0014] In some embodiments, a first safety valve is arranged at the top of the outer tank. The first safety valve is communicated with the inside of the outer tank, and the first safety valve is a one-way valve. When the pressure of the methanol vapor between the outer tank and the inner tank exceeds the preset pressure, the first safety valve opens to discharge part of the gas, ensuring the safe operation of the vaporization tank.

[0015] Preferably, a first high-temperature sensor is arranged at the top of the outer tank, and the temperature-measuring section of the first high-temperature sensor extends into the inside between the outer tank and the inner tank. It is used to measure the internal temperature of the prepared methanol vapor to ensure the safe operation of the vaporization tank.

[0016] In some embodiments, the heating tube is an electric heating tube, and the electric heating tube is vertically arranged at the bottom of the inner tank.

[0017] The electric heating tube is arranged at the bottom of the inner tank. During actual operation, the temperature of the heat-conducting oil at the bottom of the inner tank is the highest, while a methanol inlet pipe is arranged at the bottom of the outer tank, that is, the temperature of the methanol at the bottom of the outer tank is the lowest. The heat-conducting oil with the highest temperature heats the methanol with the lowest temperature, which can effectively improve the heating efficiency of methanol.

[0018] In some embodiments, an oil-water separator is arranged at the top of the outer tank, and the oil-water separator is communicated with the inside of the inner tank.

[0019] In some embodiments, a liquid level gauge is arranged on the side wall of the outer tank.

[0020] In some embodiments, the cracking reaction tank is of a vertical structure, including a cylindrical shell, an upper cover and a lower cover. The lower cover is supported by a support leg assembly;

[0021] A catalyst support plate is clamped between the lower cover and the cylindrical shell. A perforated plate is arranged between the upper cover and the cylindrical shell. The catalyst support plate is evenly provided with through holes, and a steel pipe assembly is fixedly arranged between the catalyst support plate and the perforated plate through the through holes. The steel pipe is filled with a catalyst;

[0022] Both ends of each steel pipe are communicated with the inside of the upper cover and the lower cover;

[0023] A baffle is provided inside the lower cover, dividing the cavity of the lower cover into a first part and a second part. An air inlet is provided on the lower cover of the first part, and the air inlet is connected to the vapor outlet pipe of the vapor vaporization tank; an air outlet is provided on the lower cover of the second part.

[0024] By using the cracking reaction tank of the present utility model, the flow path of methanol vapor during catalytic cracking is to flow upward through the steel pipe, then turn, and flow downward through the steel pipe, which can effectively extend the flow path length of methanol vapor, thereby increasing the residence time of the methanol catalytic cracking reaction, so as to effectively improve the conversion rate and efficiency of methanol.

[0025] The catalyst is filled in the steel pipe, and the steel pipe is assembled and fixed by a catalyst support plate and an orifice plate, and is communicated with the upper cover and the lower cover, so that all methanol vapor flows through the steel pipe and is in full contact with the catalyst, which can effectively increase the contact area between methanol vapor and the catalyst, thereby improving the catalytic cracking efficiency of methanol.

[0026] Preferably, an oil inlet is provided at the lower part of the cracking reaction tank, and an oil outlet is provided at the upper part. High-temperature heat-conducting oil is introduced into the cracking reaction tank to heat the inside of the cracking reaction tank, providing the heat required for the methanol catalytic cracking reaction. Since the heat-conducting oil flows evenly through each steel pipe, the catalyst and the reaction gas in the steel pipe can be heated evenly, ensuring the progress of the reaction.

[0027] More preferably, a heat-conducting oil reflux tank is provided at the top of the cylindrical shell, and the heat-conducting oil reflux tank is communicated with the inside of the top of the cylindrical shell. The function of the heat-conducting reflux tank is to collect the overflowing heat-conducting oil into the heat-conducting oil reflux tank when the heat-conducting oil is in an overheated state, avoiding danger caused by volume expansion.

[0028] Preferably, a second high-temperature sensor and a second safety valve are provided on the top of the upper cover.

[0029] In some embodiments, the cooler includes a first cooler and a second cooler arranged in series. The hydrogen inlet of the first cooler is connected to the air outlet of the cracking reaction tank. The cooling medium of the first cooler is methanol, and the cooling medium of the second cooler is water.

[0030] The high-temperature hydrogen obtained by catalytic cracking of methanol is first heat-exchanged with methanol. On the one hand, the hydrogen can be preliminarily cooled, and on the other hand, the methanol can be preliminarily heated. The heated methanol is recovered to the vapor vaporization tank, which can effectively save the energy for methanol vaporization.

[0031] Preferably, the second mixed hydrogen outlet of the second cooler is connected to a drainer. The mixed hydrogen contains methanol vapor that has not had time to undergo catalytic cracking reaction and methanol that has not had time to vaporize. The methanol vapor is recovered after condensation, and the methanol is discharged through the drainer and can be refluxed to the methanol storage tank for reuse. At the same time, the hydrogen is purified.

[0032] The beneficial effects obtained by one or more of the above embodiments of the present invention are as follows:

[0033] 1. The structure of the present invention integrates multiple processes, including steps such as preheating, vaporizing, cracking, cooling, filtering and diverting methanol vapor of the methanol solution, and refluxing to the methanol storage tank, with a high degree of automation.

[0034] 2. The vaporization tank of the present invention has a double-layer structure. The heat-conducting oil is in the inner tank, filled to half, with methanol gas on top and liquid below between the inner and outer tanks. It is evenly vaporized into methanol vapor, and the upper gas is superheated and enters the cracking reaction tank. The cracking reaction tank has multiple steel pipes filled with catalysts. The gas path of the methanol vapor is long, and it is evenly cracked into mixed hydrogen under the action of the catalyst.

[0035] 3. The heat-conducting oil boiler uses special-shaped heating tubes for heating, and the heat-conducting oil enters the cracking reaction tank for circulation, making the catalyst heated more evenly and having a higher catalytic conversion efficiency.

[0036] With the use of the double cooler, the mixed hydrogen can not only preheat the methanol solution but also be cooled to normal temperature gas by water, making full use of the energy of the gas tail gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings forming a part of this specification are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0038] Figure 1 is a schematic diagram of the overall structure of the methanol hydrogen production device according to an embodiment of the present invention;

[0039] Figure 2 is a schematic diagram of the structure of the vaporization tank according to an embodiment of the present invention;

[0040] Figure 3 is a schematic diagram of the structure of the cracking reaction tank according to an embodiment of the present invention;

[0041] Figure 4 is a schematic diagram of the structure of the baffle and catalyst support plate of the cracking reaction tank according to an embodiment of the present invention;

[0042] Figure 5 is a schematic diagram of the structure of the cooler according to an embodiment of the present invention.

[0043] In the figure: 1. Vaporization tank; 1.1. Vaporization tank body; 1.2. Electric heating tube; 1.3. Methanol inlet pipe; 1.4. Liquid level gauge; 1.5. Inner tank; 1.6. Outer tank; 1.7. Vapor outlet pipe; 1.8. First safety valve; 1.9. First high-temperature sensor; 1.10. Oil-water separator;

[0044] 2. Pyrolysis reaction tank; 2.1. Pyrolysis tank body; 2.2. Inlet; 2.3. Baffle; 2.4. Oil inlet; 2.5. Steel pipe; 2.6. First heat-conducting oil return tank; 2.7. Second high-temperature sensor; 2.8. Upper cover; 2.9. Second safety valve; 2.10. Second heat-conducting oil return hood; 2.11. Oil outlet; 2.12. Pyrolysis tank cavity; 2.13. Catalyst support plate; 2.14. Outlet;

[0045] 3. Heat-conducting oil boiler;

[0046] 4. Cooler; 4.1. First cooler; 4.2. Second cooler; 4.1.1. Methanol inlet; 4.1.2. Methanol outlet; 4.1.3. First mixed hydrogen inlet; 4.1.4. First mixed hydrogen outlet; 4.2.1. Second mixed hydrogen inlet; 4.2.2. Second mixed hydrogen outlet; 4.2.3. Water inlet; 4.2.4. Water outlet;

[0047] 5. Drain. Detailed implementation mode

[0048] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present utility model. Unless otherwise specified, all technical and scientific terms used in the present utility model have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs.

[0049] The present utility model will be further described below in conjunction with the embodiments and their accompanying drawings.

[0050] As Figure 1 shown, a methanol hydrogen production device includes a vaporization tank 1, a pyrolysis reaction tank 2, a heat-conducting oil boiler 3, a cooler 4, and an automatic drain 5.

[0051] The vapor reaction tank 1 is a double-layer container with inner and outer layers, and more than half of the heat-conducting oil is placed in the inner tank 1.5 for preparing methanol vapor;

[0052] The pyrolysis reaction tank 2 is arranged between the vaporization tank 1 and the heat-conducting oil boiler 3, and is internally provided with a plurality of steel pipes 2.5 filled with catalysts. Methanol vapor enters from the lower opening and undergoes a chemical reaction under the action of a hydrogen production catalyst along the steel pipes 2.5 to generate mixed hydrogen;

[0053] In the heat transfer oil boiler 3, the special-shaped heating tubes heat the heat transfer oil, and an oil pump continuously supplies the heat transfer oil to the pyrolysis reaction tank 2 in a cycle to form a closed loop.

[0054] There are two coolers 4, which respectively introduce methanol solution and water as cooling media. After the high-temperature mixed gas after the reaction is cooled in series, it returns to the automatic drainer 5.

[0055] The following is a simple description of the structure and performance of each component:

[0056] As Figure 2 shown, the vaporization tank 1 includes a vaporization tank body 1.1, an electric heating tube 1.2, a methanol inlet pipe 1.3, a liquid level gauge 1.4, an inner tank 1.5, an outer tank 1.6, a vapor outlet pipe 1.7, a first safety valve 1.8, a first high-temperature sensor 1.9, and an oil-water separator 1.10. The inner tank 1.5 is filled with more than half of the heat transfer oil, and methanol solution is introduced between the inner tank 1.5 and the outer tank 1.6 to the scale of the liquid level gauge 1.4. The electric heating tube 1.1 is arranged in the vaporization tank body 1.1. When heated to the boiling point, the methanol solution is vaporized into methanol vapor and flows out from the vapor outlet pipe 1.7. The first high-temperature sensor 1.9, the first safety valve 1.8, and the oil-water separator 1.10 are distributed on the upper part of the vaporization tank 1. The first high-temperature sensor 1.9 senses the set maximum temperature of the vaporization tank cavity. The first safety valve 1.8 is a one-way valve for exhaust to ensure that the temperature in the cavity is maintained at an appropriate level. The oil-water separator 1.10 can remove oil and impurity.

[0057] As Figure 3 and Figure 4 shown, the pyrolysis reaction tank 2 includes a pyrolysis tank body 2.1, an air inlet 2.2, a baffle 2.3, an oil inlet 2.4, a steel pipe 2.5, a first heat transfer oil return tank 2.6, a second high-temperature sensor 2.7, an upper cover 2.8, a second safety valve 2.9, a second heat transfer oil return tank 2.10, an oil outlet 2.11, a pyrolysis tank cavity 2.12, a catalyst support plate 2.13, and an air outlet 2.14. The vaporized methanol vapor enters the pyrolysis tank body 2.1 from the air inlet 2.2. The lower cover of the pyrolysis tank body 2.1 is isolated from the air inlet 2.2 and the air outlet 2.14 by the baffle 2.3. A number of steel pipes 2.5 are evenly distributed and fixedly connected to the pyrolysis tank body 2.1, with catalysts inside and arranged on the catalyst support plate 2.13. The methanol vapor passes upward through the inside of the steel pipe 2.5, passes through the upper cover 2.8, and then passes downward through the steel pipe 2.5 on the other side, and undergoes a conversion reaction to form a mixed hydrogen under the action of the hydrogen production catalyst.

[0058] The first heat transfer oil reflux cover 2.6 and the second heat transfer oil reflux cover 2.10 overflow inside when the temperature of the heat transfer oil in the pyrolysis tank cavity 2.12 is too high instantaneously. The second high-temperature sensor 2.7 senses the set maximum temperature of the pyrolysis tank cavity 2.12, and the second safety valve 2.9 exhausts air for the one-way valve to ensure that the temperature inside the pyrolysis tank cavity 2.12 is maintained at an appropriate level.

[0059] The heat transfer oil boiler 3 is provided with special-shaped heating tubes (such as straight single-end tubes, straight double-end tubes, U-shaped tubes, W-shaped tubes, and special-shaped tubes, etc.) to heat the heat transfer oil. The oil pump injects oil into the oil inlet 2.4 of the pyrolysis reaction tank 2, and the heat transfer oil flows back into the heat transfer oil boiler 3 through the oil outlet 2.11 of the pyrolysis reaction tank 2, continuously providing heat transfer oil in a cycle to form a closed-loop circuit, making the heating more uniform.

[0060] As Figure 5 shown, the cooler 4 includes a first cooler 4.1 and a second cooler 4.2. Methanol solution is introduced into the first cooler 4.1, and water is introduced into the second cooler 4.2. The mixed hydrogen gas flowing out from the gas outlet 2.14 of the pyrolysis reaction tank 2 first enters the first mixed hydrogen gas inlet 4.1.3, flows out through the first mixed hydrogen gas outlet 4.1.4, and then flows into the second cooler 4.2 through the second mixed hydrogen gas inlet 4.2.1. The prepared mixed hydrogen gas is cooled by both methanol solution and water, and flows into the automatic drainer 5 through the second mixed hydrogen gas outlet 4.2.2 of the second cooler 4.2.

[0061] The methanol inlet 4.1.1 is sucked by a vortex pump from the methanol storage tank, and then heats up with the transfer of the hot tail gas of the mixed hydrogen gas, and enters the methanol inlet pipe 1.3 of the steam vaporization tank 1 through the methanol outlet 4.1.2.

[0062] The cooled mixed hydrogen gas is introduced into the drainer (WBK-20 automatic drainer) 5 to screen out the unreacted methanol vapor and unvaporized methanol, so that the methanol flows back into the methanol storage tank, and then the dry mixed hydrogen gas goes to the burner.

[0063] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A methanol-to-hydrogen production device, characterized in that: It includes a vaporization tank, a cracking reaction tank and a cooler connected in sequence. Among them, the vaporization tank includes an outer tank and an inner tank sleeved in the middle of the outer tank. The inner tank is used to hold a heating medium, and a heating pipe is arranged inside the inner tank; a methanol holding chamber is formed between the inner tank and the outer tank; a methanol inlet pipe is arranged at the bottom of the side wall of the outer tank, and a vapor outlet pipe is arranged at the top.

2. The hydrogen production device from methanol according to claim 1, wherein: Both the inner tank and the outer tank are cylindrical structures, and the inner tank is arranged covering the effective height direction of the outer tank.

3. The hydrogen production device from methanol according to claim 2, wherein: A first safety valve is arranged at the top of the outer tank. The first safety valve is communicated with the inside of the outer tank, and the first safety valve is a one-way valve.

4. The hydrogen production device from methanol according to claim 1, characterized in that: The heating pipe is an electric heating pipe, and the electric heating pipe is vertically arranged at the bottom of the inner tank.

5. The hydrogen production device from methanol according to claim 1, characterized in that: An oil-water separator is arranged at the top of the outer tank, and the oil-water separator is communicated with the inside of the inner tank.

6. The methanol hydrogen production device according to claim 1, wherein: A liquid level gauge is arranged on the side wall of the outer tank.

7. The hydrogen production device from methanol according to claim 1, characterized in that: The cracking reaction tank is of a vertical structure and includes a cylindrical shell, an upper cover and a lower cover. The lower cover is supported by a support leg assembly; a catalyst support plate is clamped between the lower cover and the cylindrical shell, an orifice plate is arranged between the upper cover and the cylindrical shell, through holes are evenly distributed on the catalyst support plate, and a steel pipe assembly is fixedly arranged between the catalyst support plate and the orifice plate through the through holes. Catalyst is filled in the steel pipe; Both ends of each steel pipe are communicated with the inside of the upper cover and the lower cover; a baffle is arranged inside the lower cover, dividing the cavity of the lower cover into a first part and a second part. An air inlet is arranged on the lower cover of the first part, and the air inlet is connected with the vapor outlet pipe of the vaporization tank; an air outlet is arranged on the lower cover of the second part; an oil inlet is arranged at the lower part of the cracking reaction tank, and an oil outlet is arranged at the upper part; a heat-conducting oil return tank is arranged at the top of the cylindrical shell, and the heat-conducting oil return tank is communicated with the inside of the top of the cylindrical shell.

8. The hydrogen production device from methanol according to claim 7, wherein: A second high-temperature sensor and a second safety valve are arranged at the top of the upper cover.

9. The hydrogen production device from methanol according to claim 1, wherein: The cooler includes a first cooler and a second cooler arranged in series. The hydrogen inlet of the first cooler is connected with the air outlet of the cracking reaction tank. The cooling medium of the first cooler is methanol, and the cooling medium of the second cooler is water.

10. The methanol hydrogen production device according to claim 1, wherein: The second mixed hydrogen outlet of the second cooler is connected with a drainer.

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