Device for preparing methanol through carbon dioxide hydrogenation

Abstract

The utility model discloses a device for preparing methanol by hydrogenating carbon dioxide, which comprises a hydrogen gas source, a carbon dioxide gas source, a fixed bed reactor and a condenser, the gas supply flow rate of the hydrogen gas source is not lower than 3 times of the gas supply flow rate of the carbon dioxide gas source; the fixed bed reactor comprises a reaction chamber formed in a main body, a plurality of pressure stabilizing devices and a heating device, a homogeneous porous catalyst layer is arranged in the reaction chamber, the raw material gas inlet is connected to the reaction chamber, and a heating part of the heating device is arranged in the reaction chamber and used for providing reaction temperature for the catalyst layer; the pressure stabilizing device is connected with the reaction chamber in the raw material gas flowing direction to provide reaction pressure for the catalyst layer; the condenser is connected to a product outlet of the fixed bed reactor and is used for separating the obtained methanol product. The methanol preparation device is simple in structure and effectively realizes rapid and efficient preparation of methanol.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of chemical synthesis, specifically relates to a carbon dioxide hydrogenation preparation methanol device. BACKGROUND

[0002] In the past few decades, due to energy shortage and environmental problems such as greenhouse effect, the development of new materials and new technologies for carbon dioxide capture, storage and utilization has attracted widespread attention. By fuel cell, hydrogen energy is one of the promising alternative methods for carbon-based fuels in current power generation. The key to realizing hydrogen economy is to develop a reliable hydrogen storage system to store a large amount of hydrogen in a safe manner. As a liquid storage form of hydrogen energy, methanol can be generated by hydrogenation of carbon dioxide in the presence of high-efficiency catalysts, which constitutes a simple and effective carbon neutralization cycle. On the basis of capture work, CO2 storage aims to achieve long-term fixation and preservation by using various natural conditions such as ocean, stratum, etc. The currently developed storage technologies mainly include: gaseous CO2 can be directly stored in the seabed and stratum, or by direct reaction with metal oxides to form solid products. According to statistics, CO2 capture and storage can reduce about 90% of CO2 emissions from thermal power plants and factories, effectively alleviating the problem of atmospheric CO2 concentration rise caused by human intensive production activities in the past century. Similarly, the enrichment, capture and absorption storage of CO2 will consume a certain amount of energy, thus increasing the energy consumption and comprehensive benefits of production, about 20% of the additional fuel cost of power plants and factories. In addition to other supporting facilities such as collection and transportation tools, it is estimated that the energy cost of thermal power plants and factories will increase by about 40% to 80%.

[0003] On the basis of this status, converting CO2 into methanol is a new popular carbon dioxide resource storage method. Among them, thermal catalytic hydrogenation of carbon dioxide to methanol is a clean, sustainable methanol production process with obvious cost advantage developed at present. The existing thermal catalytic preparation technology needs complex facilities such as multi-stage synthesis tower and membrane separation equipment, and the generation cost is high and the control difficulty is great.

[0004] Therefore, in view of the above technical problems, it is necessary to provide a carbon dioxide hydrogenation preparation methanol device.

[0005] The information disclosed in this background section is intended only to increase an understanding of the general background of the present utility model and should not be construed as an acknowledgment or any form of suggestion that this information constitutes prior art with respect to the present utility model. CONTENT OF UTILITY MODEL

[0006] The utility model aims at providing a carbon dioxide hydrogenation preparation methanol device, which can.

[0007] To achieve the above object, the utility model provides a technical scheme as follows:

[0008] The carbon dioxide hydrogenation methanol device, including hydrogen source, carbon dioxide source, fixed bed reactor, condenser, hydrogen source, carbon dioxide source all are communicated to the raw material gas import of fixed bed reactor through the conveying pipe, and the gas supply flow rate of hydrogen source is not less than 3 times of the gas supply flow rate of carbon dioxide source;The fixed bed reactor includes the reaction chamber formed in the main part, a plurality of pressure stabilizing devices and heating device, the homogeneous porous catalyst layer is arranged in the reaction chamber, the raw material gas import is connected to the reaction chamber, and the heating part of the heating device is arranged into the reaction chamber to provide the reaction temperature for the catalyst layer, and the pressure stabilizing device is connected to the reaction chamber along the raw material gas flow direction to provide the reaction pressure for the catalyst layer;The condenser is connected to the product outlet of the fixed bed reactor and is used for separating the obtained methanol product.

[0009] In one or more embodiments of the utility model, the pressure stabilizing devices adjacent to each other are equidistant.

[0010] In one or more embodiments of the utility model, the pressure stabilizing device is a back pressure valve with rated pressure 3.5MPa.

[0011] In one or more embodiments of the utility model, the porous catalyst layer is Cu-ZnO-SrTiO3 catalyst porous layer with 1-100 μm microporous structure.

[0012] In one or more embodiments of the utility model, the heating device is electric heating device with graphite rod as heating part.

[0013] In one or more embodiments of the utility model, the multiple graphite rods of heating device are arranged on the side of reaction chamber along the raw material gas flow direction.

[0014] In one or more embodiments of the utility model, the spacing between the multiple graphite rods of heating device along the raw material gas flow direction is increasing.

[0015] In one or more embodiments of the utility model, the condenser is further connected with recovery device, and the recovery device includes hydrogen trapping chamber and recovery pipe connected between hydrogen trapping chamber and conveying pipe.

[0016] In one or more embodiments of the utility model, the recovery pipe is further provided with compressor.

[0017] In one or more embodiments of the utility model, the product outlet is further connected to product storage tank.

[0018] Compared with the prior art, the carbon dioxide hydrogenation methanol preparation device has simple structure, high preparation efficiency, realizes carbon dioxide hydrogenation catalytic preparation of methanol under the condition of excess hydrogen by using the fixed bed technology loaded with porous catalyst, and has higher reaction efficiency and energy utilization rate. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0020] Figure 1 The figure is a structural schematic view of the carbon dioxide hydrogenation methanol preparation device in an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to make the person in the art better understand the technical scheme in the present application, the technical scheme in the embodiments of the present application will be clearly and completely described in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

[0022] As Figure 1As shown, the carbon dioxide hydrogenation methanol device in the embodiment of the utility model, including hydrogen gas source 11, carbon dioxide gas source 12, fixed bed reactor 2, condenser 3, hydrogen gas source 11, carbon dioxide gas source 12 all are communicated to the raw material gas import of fixed bed reactor 2 through the conveying pipe, and the gas supply flow rate of hydrogen gas source is not less than 3 times of the gas supply flow rate of carbon dioxide gas source, here can adopt 3.1 times of flow rate ratio, to avoid excessive hydrogen raw material to participate in the circulation process, also can reduce the excessive energy loss generated in the condensation process;Fixed bed reactor 2, including the reaction chamber formed in the main body, several pressure stabilizing devices 21 and heating device, the homogeneous porous catalyst layer 22 is provided in the reaction chamber, the porous catalyst layer 22 is Cu-ZnO-SrTiO3 catalyst porous layer with 1-100 μm micropore structure, here selects the porous layer with 10 μm micropore structure, the raw material gas import is connected to the reaction chamber, and the heating part of heating device is arranged in the reaction chamber to provide the reaction temperature 260~300 DEG C for catalyst layer 22, here adopts the electric heating device with single 20KW graphite rod as heating part to obtain the reaction temperature of 280 DEG C, and the pressure stabilizing device 21 is connected along the raw material gas flow direction reaction chamber to provide the reaction pressure of catalyst layer 22 as the rated pressure 3.5MPa;Condenser 3 is connected to the product outlet of fixed bed reactor 2, and is used to separate the obtained methanol product.

[0023] Further, as an embodiment, the adjacent pressure stabilizing devices 21 are equidistant.

[0024] Further, as an embodiment, the pressure stabilizing device can adopt a back pressure valve.

[0025] Further, as an embodiment, the spacing between the multiple graphite rods of the heating device in the raw material gas flow direction is increasing. The graphite rods are of equal heat power, thereby avoiding heat accumulation between the catalyst layers.

[0026] Further, as an embodiment, in order to recycle the excess hydrogen, the condenser 3 is further connected with a recovery device, which includes a hydrogen trapping chamber and a recovery pipe connected between the hydrogen trapping chamber and the conveying pipe. In order to make the recovered hydrogen have sufficient pressure and concentration to participate in the circulation, a compressor 5 is further arranged on the recovery pipe to maintain the pressure balance between the recovery pipe and the conveying pipe.

[0027] Further, as an embodiment, the product outlet is further connected to a product storage tank 4.

[0028] In the above embodiment, the catalytic process can be as follows:

[0029] 4.1 The excess hydrogen and the carbon dioxide pass through the mass flow meters to enter the fixed bed reactor in a certain amount;

[0030] 4.2 The fixed bed reactor is heated to 260-300 degrees using a graphite electric heating rod, and a back pressure valve is used to maintain the pressure at 3.5 MPa;

[0031] 4.3 Excess hydrogen and carbon dioxide react in the reactor to generate methanol;

[0032] 4.4 The generated methanol and unreacted hydrogen enter a condenser;

[0033] 4.5 The methanol is liquefied to the bottom of the condenser and enters a methanol storage tank;

[0034] 4.6 The unreacted hydrogen is pressurized by a compressor and returned to the hydrogen raw material end as raw material.

[0035] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0036] Furthermore, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A plant for the production of methanol by the hydrogenation of carbon dioxide, characterised in that, The hydrogen gas source and the carbon dioxide gas source are communicated to the raw material gas inlet of the fixed bed reactor through conveying pipes, and the gas supply flow rate of the hydrogen gas source is not less than 3 times of the gas supply flow rate of the carbon dioxide gas source. The fixed bed reactor comprises a reaction chamber formed in a main body, a plurality of pressure stabilizing devices and a heating device, the reaction chamber is provided with a homogeneous porous catalyst layer, the raw material gas inlet is connected to the reaction chamber, the heating part of the heating device is arranged into the reaction chamber to provide a reaction temperature for the catalyst layer, and the pressure stabilizing devices are connected to the reaction chamber along the raw material gas flow direction to provide a reaction pressure for the catalyst layer. The condenser is connected to the product outlet of the fixed bed reactor to separate the obtained methanol product. The pressure stabilizing devices are equidistantly arranged.

2. The apparatus for the methanol synthesis from carbon dioxide hydrogenation according to claim 1, characterized in that, The pressure stabilizing devices are back pressure valves with a rated pressure of 3.5 MPa.

3. A plant for the methanol synthesis from carbon dioxide and hydrogen according to claim 1 or 2, characterised in that, The porous catalyst layer is a Cu-ZnO-SrTiO3 catalyst porous layer with a microporous structure of 1-100 μm.

4. The apparatus for the methanol synthesis from carbon dioxide hydrogenation according to claim 1, characterized in that, The heating device is an electric heating device with graphite rods as the heating part.

5. The apparatus for the methanol synthesis from carbon dioxide hydrogenation according to claim 1, characterized in that, The graphite rods of the heating device are arranged on the side of the reaction chamber along the raw material gas flow direction.

6. The apparatus for the methanol synthesis from carbon dioxide hydrogenation according to claim 5, characterized in that, The distance between the graphite rods of the heating device is increased along the raw material gas flow direction.

7. The apparatus for the methanol synthesis from carbon dioxide hydrogenation according to claim 6, characterized in that, The condenser is further connected with a recovery device, and the recovery device comprises a hydrogen trapping chamber and a recovery pipe connected between the hydrogen trapping chamber and the conveying pipe.

8. A plant for the production of methanol by the hydrogenation of carbon dioxide according to any one of claims 1 to 7, characterised in that, A compressor is further arranged on the recovery pipe.

9. The apparatus for the methanol synthesis from carbon dioxide hydrogenation according to claim 8, characterized in that, The product outlet is further connected to a product storage tank.

10. The apparatus for the methanol synthesis from carbon dioxide hydrogenation according to claim 1, characterized in that, ​

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