A methanol hydrogen production converter and a methanol hydrogen production device

Abstract

The present invention relates to a methanol-to-hydrogen converter and a methanol-to-hydrogen device, wherein the methanol-to-hydrogen converter comprises: an outer cavity mechanism, which is vertically arranged and used to accommodate a raw material liquid; an inner cavity mechanism, which is sealed at both ends and inserted in the outer cavity mechanism; a receiving cavity is provided in the inner cavity mechanism for accommodating a heating medium; a conversion mechanism, which is arranged in the inner cavity mechanism; the conversion mechanism comprises a conversion tube, which is vertically arranged and wrapped by the heating medium, and is used to catalyze the vaporized raw material liquid to generate a conversion gas containing hydrogen; a circular heat exchange tube bundle mechanism, which is arranged in the outer cavity mechanism and sleeved on the outer periphery of the inner cavity mechanism; the circular heat exchange tube bundle mechanism comprises a heat exchange tube, an upper circular tube, and a lower circular tube for circulating heat transfer oil. Through the above arrangement, the problems of large equipment footprint, low heat utilization rate of heat transfer oil, and high engineering cost caused by the non-integrated design of the converter in the current methanol-to-hydrogen device can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of methanol hydrogen production chemical equipment, and in particular to a methanol hydrogen production converter and a methanol hydrogen production device. Background Art

[0002] The vaporizer superheater and converter are the core equipment in the methanol hydrogen production unit. The raw liquid enters the vaporizer superheater for heat exchange with the heat transfer oil. After vaporization, it enters the converter for catalytic reaction to produce conversion gas containing hydrogen.

[0003] The above two sets of equipment occupy a relatively large area, and the heat transfer oil system needs to pass through the vaporization superheater and then enter the converter to provide the heat required for the reaction. The pipes of the heat transfer oil system are relatively thick, which is not convenient to arrange during piping, and the external circulation will also cause certain heat loss.

[0004] With the development of skid-mounted methanol-to-hydrogen plants, how to reduce the volume of vaporizers, superheaters and converters and skid-mount them into blocks has become an important issue.

[0005] In the prior art, Chinese patent document CN214407084U discloses a heat exchanger for a methanol hydrogen production heat exchange system, which relates to the field of heat exchangers and is used for heat exchange of raw material liquid in a methanol hydrogen production process; it includes a heat exchanger and a vaporization superheater, the heat exchanger and the vaporization superheater are fixedly connected via a second tube sheet, and the tube side of the heat exchanger and the shell side of the vaporization superheater are connected via the second tube sheet; this patent only involves a combined design of a heat exchanger and a vaporization superheater, but does not involve the integration of a converter.

[0006] In order to ensure efficient integration of the methanol hydrogen production device and fully guarantee the heat exchange effect, it is necessary to make full use of the heat of the heat transfer oil and minimize the length of the equipment's extracorporeal circulation pipeline. Summary of the invention

[0007] In order to solve the above technical problems, the purpose of the present invention is to provide a methanol to hydrogen converter and a methanol to hydrogen device, wherein the methanol to hydrogen converter is used to solve the problem of low heat utilization rate of heat transfer oil caused by the non-integrated design of the converter in the current methanol to hydrogen device.

[0008] In order to achieve one of the above-mentioned purposes of the invention, an embodiment of the present invention provides a methanol-to-hydrogen converter, comprising:

[0009] The outer chamber mechanism is vertically arranged and used to contain the raw material liquid;

[0010] The inner cavity mechanism has two ends sealed and inserted into the outer cavity mechanism; the inner cavity mechanism is provided with a receiving cavity for receiving a heating medium;

[0011] A conversion mechanism is arranged in the inner cavity mechanism; the conversion mechanism includes a conversion tube, which is vertically arranged and wrapped by the heating medium, and is used to catalyze the vaporized raw material liquid to generate a conversion gas containing hydrogen;

[0012] The annular heat exchange tube bundle mechanism is arranged in the outer cavity mechanism and sleeved on the outer periphery of the inner cavity mechanism; the annular heat exchange tube bundle mechanism comprises heat exchange tubes, upper annular tubes and lower annular tubes, and is used for circulating heat transfer oil.

[0013] As a further improvement of one embodiment of the present invention, the annular heat exchange tube bundle structure also includes a lower inlet for heat transfer oil and a heat transfer oil outlet; the lower inlet for heat transfer oil is connected to the lower annular tube, and the heat transfer oil outlet is connected to the upper annular tube.

[0014] As a further improvement of an embodiment of the present invention, the heat supply medium is heat transfer oil.

[0015] As a further improvement of one embodiment of the present invention, the inner cavity mechanism also includes an upper inlet for heat transfer oil and a lower outlet for heat transfer oil; the upper inlet for heat transfer oil is connected to the top of the accommodating cavity, and the lower outlet for heat transfer oil is connected to the bottom of the accommodating cavity.

[0016] As a further improvement of one embodiment of the present invention, the external cavity mechanism includes a raw material liquid inlet and a vaporized superheated gas outlet; the raw material liquid inlet is arranged at the bottom of the external cavity mechanism, and the vaporized superheated gas outlet is arranged at the top of the external cavity mechanism; the internal cavity mechanism also includes a vaporized superheated gas inlet, which is arranged at the top of the conversion mechanism.

[0017] As a further improvement of an embodiment of the present invention, both ends of the conversion tube protrude outside the outer cavity mechanism; the conversion mechanism also includes an upper head and a lower head, which are respectively arranged at both ends of the conversion tube.

[0018] As a further improvement of an embodiment of the present invention, the upper head and the lower head are respectively connected to two ends of the conversion mechanism through flanges.

[0019] As a further improvement of one embodiment of the present invention, the conversion mechanism further includes an upper tube plate and a lower tube plate; two ends of the conversion tube are fixedly connected to the upper tube plate and the lower tube plate respectively.

[0020] As a further improvement of one embodiment of the present invention, the methanol-to-hydrogen converter further includes a support leg disposed at the bottom of the methanol-to-hydrogen converter.

[0021] An embodiment of the present invention further provides a methanol-to-hydrogen device, comprising the methanol-to-hydrogen converter as described in any one of the above items.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) The integrated design of the vaporization superheater and the converter reduces the footprint, making the device more compact and convenient for skid installation and transportation.

[0024] (2) Make full use of the heat of thermal oil, reduce heat loss, reduce energy consumption of the device, and reduce the load of the thermal oil heating system;

[0025] (3) Reducing the number of automatic control measures for pipelines and instruments is conducive to the automatic control of the device and reduces investment costs;

[0026] (4) Effectively utilize the heat of the heat transfer oil; because the temperature difference between the inner and outer chambers is small, the thermal stress of the equipment is reduced, the life of the equipment is extended, and the equipment is safer and more stable;

[0027] (5) Reducing the catalyst start-up reduction time and heating time can shorten the debugging time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 2 is a schematic structural diagram of a circular heat exchange tube bundle mechanism according to an embodiment of the present invention;

[0030] Figure 2 is a schematic structural diagram of a methanol-to-hydrogen converter according to an embodiment of the present invention;

[0031] Figure 3 It is a schematic diagram of the processing flow of a methanol-to-hydrogen converter in one embodiment of the present invention.

[0032] The reference numerals in the accompanying drawings are as follows:

[0033] External cavity mechanism 1, annular heat exchange tube bundle mechanism 2, upper head 3, upper tube sheet 4, conversion tube 5, internal cavity mechanism 6, lower head 7, lower tube sheet 8, raw liquid inlet N1, vaporized superheated gas outlet N2, vaporized superheated gas inlet N3, conversion gas outlet N4; heat transfer oil lower inlet N5, heat transfer oil outlet N6, heat transfer oil upper inlet N7, heat transfer oil lower outlet N8. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in combination with the specific implementation methods of the present invention and the corresponding drawings. Obviously, the described implementation methods are only part of the implementation methods of the present invention, not all implementation methods. Based on the implementation methods of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but should not be construed as limiting the present invention.

[0036] like Figures 1 to 3 As shown, one embodiment of the present invention provides a methanol-to-hydrogen converter, comprising:

[0037] The outer chamber mechanism 1 is vertically arranged and used to contain the raw material liquid;

[0038] The inner cavity mechanism 6 is sealed at both ends and inserted into the outer cavity mechanism 1; a receiving cavity is provided in the inner cavity mechanism 6 for receiving a heating medium;

[0039] The conversion mechanism is arranged in the inner cavity mechanism 6; the conversion mechanism includes a conversion tube 5, which is vertically arranged and wrapped by a heating medium, and is used to catalyze the vaporized raw material liquid to generate a conversion gas containing hydrogen;

[0040] The annular heat exchange tube bundle mechanism 2 is arranged in the outer cavity mechanism 1 and sleeved on the outer periphery of the inner cavity mechanism 6; the annular heat exchange tube bundle mechanism 2 includes heat exchange tubes, upper annular tubes, and lower annular tubes, which are used to circulate heat transfer oil.

[0041] The methanol-to-hydrogen converter of the present invention integrates the vaporization superheater and the converter to form a heat exchanger with a multi-channel double cavity and a conversion tube 5, thereby reducing the volume of the two devices while ensuring the heat exchange effect;

[0042] Under the same hydrogen production scale, the heat exchange area can be effectively reduced, the heat exchange efficiency can be improved, the conversion efficiency can be improved, the heat transfer oil circulation volume and pressure drop can be reduced, and the device can be made more compact to facilitate skid installation and transportation.

[0043] In actual use, a circular heat exchange tube bundle is arranged in the outer cavity; the heat tube bundle is not limited to smooth tubes, but also includes spirally wound tubes, finned tubes, etc.; a methanol conversion system is arranged in the inner cavity, and a vaporization superheating system is arranged in the outer cavity.

[0044] In addition, the annular heat exchange tube bundle in the outer cavity adopts an overall heat treatment process to eliminate stress, and the conversion tube can use DN45 pipe.

[0045] In actual operation, in the above-mentioned integrated converter, the operating pressure in the outer cavity can reach 2.5MPag, and the operating pressure in the conversion tube can reach 25MPag.

[0046] Furthermore, the annular heat exchange tube bundle mechanism 2 further includes a heat transfer oil lower inlet N5 and a heat transfer oil outlet N6; the heat transfer oil lower inlet N5 is connected to the lower annular tube, and the heat transfer oil outlet N6 is connected to the upper annular tube.

[0047] In actual use, the heat exchange tubes are connected by upper and lower rings, and the heat transfer oil flows through the lower ring to the upper ring.

[0048] Furthermore, the heating medium is thermal oil.

[0049] Furthermore, the inner cavity mechanism 6 also includes an upper heat transfer oil inlet N7 and a lower heat transfer oil outlet N8; the upper heat transfer oil inlet N7 is connected to the top of the accommodating cavity, and the lower heat transfer oil outlet N8 is connected to the bottom of the accommodating cavity.

[0050] In actual use, the inner cavity is provided with a conversion tube 5; heat transfer oil is used between the conversion tubes 5 for heating, and the heating medium also includes steam, hot water, other raw oils, etc.

[0051] As a result, the heat transfer oil flows from top to bottom in the accommodating cavity.

[0052] Furthermore, the external chamber mechanism 1 includes a raw liquid inlet N1 and a vaporized superheated gas outlet N2; the raw liquid inlet N1 is arranged at the bottom of the external chamber mechanism 1, and the vaporized superheated gas outlet N2 is arranged at the top of the external chamber mechanism 1; the internal chamber mechanism 6 also includes a vaporized superheated gas inlet N3, which is arranged at the top of the conversion mechanism.

[0053] Thus, the raw material liquid is vaporized in the external chamber mechanism 1, and the vaporized superheated gas is discharged from the top of the external chamber mechanism 1 and enters from the top of the conversion mechanism to carry out the conversion reaction.

[0054] Furthermore, both ends of the conversion tube 5 protrude outside the outer cavity mechanism 1 ; the conversion mechanism further includes an upper head 3 and a lower head 7 , which are respectively arranged at both ends of the conversion tube 5 .

[0055] Furthermore, the upper head 3 and the lower head 7 are respectively connected to the two ends of the conversion mechanism through flanges.

[0056] In actual use, the inner cavity extends out of the outer cavity, and the upper and lower heads 7 of the portion extending out of the outer cavity can be connected by flanges.

[0057] Furthermore, the conversion mechanism also includes an upper tube plate 4 and a lower tube plate 8; both ends of the conversion tube 5 are fixedly connected to the upper tube plate 4 and the lower tube plate 8 respectively.

[0058] In actual use, both ends of the conversion tube 5 are fixed by tube sheets.

[0059] In addition, heat treatment can be used to eliminate stress at the tube sheet and the conversion tube 5 in the inner cavity.

[0060] Furthermore, the methanol-to-hydrogen converter also includes support legs, which are arranged at the bottom of the methanol-to-hydrogen converter.

[0061] In actual use, the outside of the converter can be installed in the form of ears or legs; the pipe mouth can be connected by flange.

[0062] An embodiment of the present invention further provides a methanol-to-hydrogen device, comprising any of the above methanol-to-hydrogen converters.

[0063] In specific embodiment 1,

[0064] When using an integrated converter, under the same conditions, the circular heat exchange tube diameter is DN50, 32 tubes, 2m in diameter, 3m in height, and only 19.4㎡ of heat exchange area is required; there are 230 converter tubes with a diameter of Length 4.7 meters, heat exchange area 152㎡, heat transfer oil circulation volume 40 cubic meters / hour, pressure drop 50Kpag.

[0065] In the existing conventional technology, 500Nm 3 / h methanol hydrogen production unit requires a vaporizer superheater area of ​​40㎡, a conversion tube heat exchange area of ​​152㎡, a heat transfer oil circulation volume of 45 cubic meters / hour, and a pressure drop of 2barg.

[0066] In specific embodiment 2,

[0067] When an integrated converter is used, its overall diameter is 2.5 meters and the floor area is 0.785x2.5mx2.5m=4.9 square meters.

[0068] In the existing conventional technology, 500Nm 3 / h methanol hydrogen production unit requires an area of ​​3.5mx2m=7㎡ ​​for the vaporization superheater and converter.

[0069] In specific embodiment 3,

[0070] When using an integrated converter for a device of the same size, it only takes 8 hours to produce qualified hydrogen;

[0071] In the existing conventional technology, 500Nm 3 / h methanol hydrogen production device, it takes 12 hours from the start of heating the heat transfer oil and reducing the catalyst to producing qualified hydrogen.

[0072] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0073] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention and are not intended to limit the scope of protection of the present invention. All equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A methanol to hydrogen converter, characterized in that: include: The outer chamber mechanism is vertically arranged and used to contain the raw material liquid; An inner cavity mechanism, both ends of which are sealed and inserted into the outer cavity mechanism; The inner cavity mechanism is provided with a receiving cavity for receiving a heating medium; A conversion mechanism is arranged in the inner cavity mechanism; the conversion mechanism includes a conversion tube, which is vertically arranged and wrapped by the heating medium, and is used to catalyze the vaporized raw material liquid to generate a conversion gas containing hydrogen; The annular heat exchange tube bundle mechanism is arranged in the outer cavity mechanism and sleeved on the outer periphery of the inner cavity mechanism; the annular heat exchange tube bundle mechanism includes a heat exchange tube, an upper annular tube, and a lower annular tube, which are used to circulate heat transfer oil; wherein, The outer cavity mechanism includes a raw material liquid inlet and a vaporized superheated gas outlet; the raw material liquid inlet is arranged at the bottom of the outer cavity mechanism, and the vaporized superheated gas outlet is arranged at the top of the outer cavity mechanism; the inner cavity mechanism also includes a vaporized superheated gas inlet, which is arranged at the top of the conversion mechanism.

2. The methanol-to-hydrogen converter according to claim 1, characterized in that: The annular heat exchange tube bundle mechanism further includes a lower heat transfer oil inlet and a heat transfer oil outlet; the lower heat transfer oil inlet is communicated with the lower annular tube, and the heat transfer oil outlet is communicated with the upper annular tube.

3. The methanol-to-hydrogen converter according to claim 2, characterized in that: The heat supply medium is heat transfer oil.

4. The methanol-to-hydrogen converter according to claim 3, characterized in that: The inner cavity mechanism further includes an upper heat transfer oil inlet and a lower heat transfer oil outlet; the upper heat transfer oil inlet is communicated with the top of the accommodating cavity, and the lower heat transfer oil outlet is communicated with the bottom of the accommodating cavity.

5. The methanol-to-hydrogen converter according to claim 4, characterized in that: The two ends of the conversion tube protrude outside the outer cavity mechanism; the conversion mechanism also includes an upper head and a lower head, which are respectively arranged at the two ends of the conversion tube.

6. The methanol-to-hydrogen converter according to claim 5, characterized in that: The upper sealing head and the lower sealing head are respectively connected to two ends of the conversion mechanism through flanges.

7. The methanol-to-hydrogen converter according to claim 6, characterized in that: The conversion mechanism further comprises an upper tube plate and a lower tube plate; two ends of the conversion tube are fixedly connected to the upper tube plate and the lower tube plate respectively.

8. The methanol-to-hydrogen converter according to claim 7, characterized in that: The methanol-to-hydrogen converter also includes a support leg, which is arranged at the bottom of the methanol-to-hydrogen converter.

9. A methanol hydrogen production device, characterized in that: It comprises a methanol-to-hydrogen converter as described in any one of claims 1 to 8 above.

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