Energy-saving methanol cracking hydrogen production reaction device
By integrating the smoke air module, preheating module and cracking conversion module in the methanol cracking reactor, the heat gradient transfer is used to solve the problems of complex and high energy consumption of existing equipment, and the energy-saving and compact reaction device design is achieved.
Patent Information
- Application Number
- CN202323387331.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-12
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2033-12-12
AI Technical Summary
The existing methanol cracking reactor equipment is complex, has a large area and high energy consumption, which cannot meet the needs of energy conservation and intensiveness.
A shell-and-tube reaction device was designed to integrate smoke air module, preheating module and cracking conversion module. The catalytic reaction heat in the smoke air module is used to transfer heat gradient through the preheating module and cracking conversion module, reducing the heating equipment The quantity of heat is realized.
The methanol cracking reaction without additional heating system is achieved, which reduces production energy consumption, saves device land, and improves the compactness and flexibility of equipment layout.
Smart Images
Figure CN222131828U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to a reaction device, in particular to a device for producing hydrogen by cracking and converting methanol in the chemical industry. Background Art
[0002] Methanol cracking reactor is a widely used reaction vessel for methanol cracking and conversion to produce hydrogen, generally a shell-and-tube reactor. Catalyst particles are filled in the tube bundle, and heat is provided by the heat medium outside the tube bundle. When methanol vapor passes through the catalyst in the tube bundle, it absorbs heat and promotes the cracking reaction.
[0003] The existing methanol cracking reactor is only a single reaction vessel, and also requires additional heating medium generation equipment for the heat required for the reaction and a vaporization superheater for generating methanol vapor. Usually, a large number of equipment, pipelines and accessories need to be arranged, which takes up a lot of space and has high energy consumption, and cannot meet the needs of energy-saving and intensive reaction devices. Utility Model Content
[0004] The utility model aims to provide an energy-saving methanol cracking hydrogen production reaction device to solve many problems in the prior art.
[0005] The purpose of the utility model is achieved through the following technical solutions:
[0006] An energy-saving methanol cracking hydrogen production reaction device, the main structure of the device is a shell and tube container, the shell and tube container includes a container body and an upper head arranged on the container body, and a lower head under the container body; the device also includes a preheating module and a cracking conversion module arranged in the shell and tube container, and a smoke and wind module arranged on one side of the shell and tube container.
[0007] Furthermore, the device also includes a fuel inlet and a smoke and air outlet. The fuel inlet is arranged on one side of the shell and tube container, and the smoke and air outlet is arranged on the other side of the shell and tube container.
[0008] Furthermore, the smoke and air module is arranged between the smoke and air inlet (fuel inlet) and the container body.
[0009] Furthermore, the smoke and air module comprises a rectangular cavity and a regular catalyst filler arranged in the rectangular cavity, and the temperature of the smoke and air (fuel) is increased through catalytic reaction.
[0010] Furthermore, a vertically arranged heat exchange tube bundle is arranged in the preheating module, and the preheating module is arranged on a side close to the smoke and air module; the smoke and air preheat the raw materials in the tube bundle through the tube wall.
[0011] Furthermore, the cracking conversion module is provided with a vertically arranged heat exchange tube bundle filled with cracking catalyst particles. The cracking conversion module is arranged on the other side of the preheating module, that is, close to the smoke and air outlet side. The smoke and air provide heat for the cracking conversion in the tube bundle through the tube wall.
[0012] Furthermore, a partition plate is provided at the lower end of the shell and tube container, i.e., in the lower head, and the partition plate is welded in the lower head of the shell and tube container. The partition plate divides the lower head into two chambers, namely, partition chamber 1 and partition chamber 2; partition chamber 1 is arranged below the corresponding cracking and conversion module, and partition chamber 2 is arranged below the corresponding preheating module. The two partition chambers are of different sizes. The two spaces separated by the partition plate: one space is to distribute the raw material liquid (methanol) to the tube bundle of the preheating module, and when it comes back, the vaporized reaction gas goes to another space. The position of the partition plate can be allocated according to the proportion of the number of tube bundles in the preheating module and the cracking and conversion module. If there are fewer tube bundles in the preheating module, the space on the side where the partition plate is located will be smaller (that is, the partition space corresponding to the preheating template will be smaller), corresponding to the equipment structure.
[0013] As a better implementation in the present application, the heat exchange tube bundle in the preheating module is less than the heat exchange tube bundle in the cracking conversion module.
[0014] As a better embodiment of the present application, the heat exchange tube bundle (quantity) in the preheating module accounts for 10-18% (specifically 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, etc.) of the total heat exchange tube bundle (quantity) in the preheating module and the cracking conversion module.
[0015] Furthermore, a methanol inlet and a conversion gas outlet are arranged on the lower head; a partition plate is arranged between the methanol inlet and the conversion gas outlet at the bottom of the shell and tube container, that is, the methanol inlet is connected with the second partition chamber to facilitate the entry of methanol, and the conversion gas outlet is connected with the first partition chamber to facilitate the output of the conversion gas.
[0016] The specific reaction process of the energy-saving methanol cracking hydrogen production reaction device is as follows:
[0017] The smoke and wind module is arranged at the smoke and wind inlet of the shell and tube container. The fuel is catalytically reacted in the smoke and wind module. The smoke and wind brings the reaction heat horizontally into the shell side of the shell and tube container, providing the heat required for vaporization and reaction for the methanol in the tube bundle of the shell and tube container. The preheating module and the cracking conversion module are integrated in a shell and tube container. A part of the tube bundle is the heat exchange tube of the preheating module, and the other part of the tube bundle is the reaction tube of the cracking conversion module; the raw methanol enters the heat exchange tube of the preheating module from the second sub-stage chamber at the bottom of the shell and tube container to achieve preheating; the methanol vapor enters the reaction tube bundle filled with the catalyst through the upper head to complete the cracking conversion reaction, and the conversion gas leaves from the first sub-stage chamber at the bottom.
[0018] The smoke and air module, preheating module and cracking conversion module are integrated into one equipment cavity, so that the heat between the three modules can be transferred according to the temperature gradient. The heat generated by the catalytic reaction of the smoke and air module has the highest temperature. After the preheating module absorbs heat, the temperature decreases. After the cracking conversion module absorbs heat, the temperature further decreases. The smoke and air return to the inlet of the smoke and air module to continue the catalytic reaction.
[0019] Compared with the prior art, the positive effects of the utility model are:
[0020] (I) The heating medium of the utility model is the PSA (pressure swing adsorption) hydrogen extraction desorption gas in the process system or the flue gas after the raw material methanol reaction, and no additional heating system is required.
[0021] (ii) By integrating the three types of equipment required for heating, preheating and reaction in the process route, the number of process equipment in the methanol cracking reaction unit is reduced, the structural layout is compact, the integrated utilization of heat is achieved, the production energy consumption is reduced, the unit space is saved, and the flexible application of various specifications of units is adapted. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a structural schematic diagram of the utility model.
[0023] Figure 2 It is a schematic cross-sectional diagram of the arrangement of the heat exchange tube bundles in the preheating module and the cracking conversion module.
[0024] Among them, 1 is the smoke and air module, 2 is the preheating module, 3 is the cracking and conversion module, 4 is the smoke and air inlet, 5 is the smoke and air outlet, 6 is the partition plate, 7 is the methanol inlet, and 8 is the conversion gas outlet. DETAILED DESCRIPTION
[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. The orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the application product is usually placed when used, or is the orientation or position relationship commonly understood by those skilled in the art. The terms "set", "open", "installed", "connected" and "connected" should be understood in a broad sense.
[0026] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the embodiments and features in the embodiments of this application can be combined with each other without conflict.
[0027] Embodiment 1:
[0028] An energy-saving methanol cracking hydrogen production reaction device, the main structure of the device is a shell and tube container, the shell and tube container includes a container body and an upper head arranged on the container body, and a lower head under the container body; the device also includes a preheating module 2 and a cracking conversion module 3 arranged in the shell and tube container, and a smoke and wind module 1 arranged on one side of the shell and tube container.
[0029] The device further comprises a smoke air inlet 4 and a smoke air outlet 5. The smoke air inlet 4 is arranged on one side of the shell and tube container, and the smoke air outlet 5 is arranged on the other side of the shell and tube container.
[0030] The smoke and air module 1 is arranged between the smoke and air inlet (fuel inlet) 4 and the container body.
[0031] The smoke and wind module 1 comprises a rectangular cavity and a regular catalyst filler arranged in the rectangular cavity, and the temperature of the smoke and wind is increased through catalytic reaction.
[0032] The preheating module 2 is provided with a vertically arranged heat exchange tube bundle, and the preheating module 2 is arranged on a side close to the smoke and wind module 1. The smoke and wind preheat the raw materials in the tube bundle through the tube wall.
[0033] The cracking conversion module 3 is provided with a vertically arranged heat exchange tube bundle filled with cracking catalyst particles. The cracking conversion module 3 is arranged on the other side of the preheating module 2, close to the smoke and air outlet 5. The smoke and air pass through the tube wall to provide heat for the cracking conversion in the tube bundle.
[0034] A partition plate 6 is arranged in the lower head, and the partition plate 6 is welded in the lower head of the shell and tube container. The partition plate 6 divides the lower head into two chambers, namely, partition chamber 1 and partition chamber 2. The two chambers are of different sizes. The partition chamber 1 is arranged below the cracking conversion module 3, and the partition chamber 2 is arranged below the preheating module 2. The two sides of the space coming out of the partition: one side of the space is for distributing the raw material liquid to the tube bundle, and when it comes back, it is the confluence space of the vaporized reaction gas to the other side. The position of the partition can correspond to the distribution space according to the proportion of the tube bundle. The preheating part has fewer tube bundles, and the space on the side where the partition plate is located is smaller, corresponding to the equipment structure.
[0035] The heat exchange tube bundles in the preheating module are less than those in the cracking conversion module. The heat exchange tube bundles (quantity) in the preheating module account for 12% of the total heat exchange tube bundles (quantity) in the preheating module and the cracking conversion module.
[0036] A methanol inlet 7 and a conversion gas outlet 8 are arranged on the lower head; a partition plate 6 is arranged between the methanol inlet 7 and the conversion gas outlet 8 at the bottom of the shell and tube container, that is, the methanol inlet 7 is connected to the second partition chamber, and the conversion gas outlet 8 is connected to the first partition chamber.
[0037] The specific reaction process of the energy-saving methanol cracking hydrogen production reaction device is as follows:
[0038] The smoke and wind module 1 is arranged at the smoke and wind inlet 5 of the shell and tube container. The fuel completes the catalytic reaction in the smoke and wind module 1. The smoke and wind brings the reaction heat into the shell of the shell and tube container, providing the heat required for vaporization and reaction for the methanol in the tube bundle of the shell and tube container. The preheating module 2 and the cracking conversion module 3 are integrated in a shell and tube container. A part of the tube bundle is the heat exchange tube of the preheating module 2, and the other part of the tube bundle is the reaction tube of the cracking conversion module 3; the raw methanol enters the heat exchange tube of the preheating module 2 from the second sub-stage chamber at the bottom of the shell and tube container to achieve preheating; the methanol vapor enters the reaction tube bundle filled with the catalyst through the upper tube box to complete the cracking conversion reaction, and the conversion gas leaves from the first sub-stage chamber at the bottom.
[0039] The smoke and air module 1, preheating module 2 and cracking conversion module 3 are integrated into one equipment cavity, so that the heat between the three modules can be transferred according to the temperature gradient. The heat generated by the catalytic reaction of the smoke and air module 1 has the highest temperature. After the preheating module 2 absorbs the heat, the temperature is lowered. After the cracking conversion module 3 absorbs the heat, the temperature is further lowered. The smoke and air return to the inlet of the smoke and air module 1 to continue the catalytic reaction.
[0040] Embodiment 2:
[0041] An energy-saving methanol cracking hydrogen production reaction device, the structure and principle of the device are the same as those of Example 1, except that the heat exchange tube bundle (quantity) in the preheating module accounts for 15% of the total heat exchange tube bundle (quantity) in the preheating module and the cracking conversion module.
[0042] The above is only a preferred embodiment of the utility model and does not impose any form of limitation on the utility model. According to the technical essence of the utility model, within the spirit and principles of the utility model, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope of the utility model technical solution.
Claims
1. An energy-saving methanol cracking hydrogen production reaction device, the main structure of which is a tube-shell container, which includes a container body, an upper head arranged on the container body, and a lower head under the container body; characterized in that: The device also includes a preheating module (2) and a cracking conversion module (3) arranged in the shell and tube container, and a smoke and air module (1) arranged on one side of the shell and tube container.
2. The methanol cracking hydrogen production reaction device according to claim 1, characterized in that: The device further comprises a smoke air inlet (4) and a smoke air outlet (5); the smoke air inlet (4) is arranged on one side of the shell-and-tube container, and the smoke air outlet (5) is arranged on the other side of the shell-and-tube container.
3. The methanol cracking hydrogen production reaction device according to claim 2, characterized in that: The smoke and air module (1) is arranged between the smoke and air inlet (4) and the container body.
4. The methanol cracking hydrogen production reaction device according to claim 1, characterized in that: The smoke and air module (1) comprises a rectangular cavity and a regular catalyst filler arranged in the rectangular cavity.
5. The methanol cracking hydrogen production reaction device according to claim 1, characterized in that: The preheating module (2) is provided with a vertically arranged heat exchange tube bundle, and the preheating module (2) is arranged on a side close to the smoke and air module (1).
6. The methanol cracking hydrogen production reaction device according to claim 5, characterized in that: The cracking conversion module (3) is provided with a vertically arranged heat exchange tube bundle filled with cracking catalyst particles. The cracking conversion module (3) is arranged on the other side of the preheating module (2), close to the smoke and air outlet (5).
7. The methanol cracking hydrogen production reaction device according to claim 1, characterized in that: A step partition (6) is arranged in the lower head, and the step partition (6) is welded in the lower head of the shell and tube container. The step partition (6) divides the lower head into two chambers, namely, step chamber 1 and step chamber 2; the step chamber 1 is arranged below the corresponding cracking conversion module (3), and the step chamber 2 is arranged below the corresponding preheating module (2).
8. The methanol cracking hydrogen production reaction device according to claim 6, characterized in that: The heat exchange tube bundle in the preheating module (2) is smaller than the heat exchange tube bundle in the cracking conversion module (3).
9. The methanol cracking hydrogen production reaction device according to claim 8, characterized in that: The number of heat exchange tube bundles in the preheating module (2) accounts for 10 to 18% of the total number of heat exchange tube bundles in the preheating module (2) and the cracking conversion module (3).
10. The methanol cracking hydrogen production reaction device according to claim 7, characterized in that: A methanol inlet (7) and a conversion gas outlet (8) are arranged on the lower head; a separation partition (6) is arranged between the methanol inlet (7) and the conversion gas outlet (8) at the bottom of the shell-and-tube container, that is, the methanol inlet (7) is connected to the separation chamber 2, and the conversion gas outlet (8) is connected to the separation chamber 1.