Biomass coupling green hydrogen to prepare green methanol device

Abstract

The utility model discloses a kind of green methanol devices of biomass coupling green hydrogen, it is related to the technical field of green methanol preparation, and it includes: water electrolysis hydrogen production device, biomass gasification device, water gas shift device, synthesis gas purification device, methanol synthesis device, methanol separation device, methanol rectification device and first heat exchanger;Water electrolysis hydrogen production device's oxygen outlet is communicated with biomass gasification device, and water electrolysis hydrogen production device's hydrogen outlet is with water gas shift device;First heat exchanger is set on the synthesis gas outlet pipeline of biomass gasification device, for providing heat source for methanol rectification device.The utility model realizes the accurate utilization of by-product oxygen and hydrogen of water electrolysis, and the resource utilization of oxygen saves air separation unit.Through the innovative setting of first heat exchanger and second heat exchanger, two efficient cascade utilization is carried out to biomass gasification reaction heat, first to provide steam for solid oxide battery tank, then to provide heat for methanol rectification.

Description

Technical Field

[0001] This utility model relates to the technical field of green methanol preparation, specifically to an apparatus for preparing green methanol from biomass. Background Technology

[0002] Methanol is an important basic chemical raw material and a promising clean energy carrier. Currently, the mainstream technological pathways include biomass gasification to produce methanol and renewable energy-based water electrolysis coupled with carbon dioxide hydrogenation to produce methanol.

[0003] In the field of biomass gasification for methanol production, technological development has been rapid, and many preparation technologies have been disclosed. For example, Chinese invention patent No. 202410327915.7 discloses an off-grid system and method for preparing green methanol from biomass based on a gasifier. This system includes a biomass drying and crushing device, a gasifier, a high-temperature reforming chamber, a waste heat boiler, a syngas treatment device, a first compressor, a methanol synthesis tower, and a methanol treatment device. The gasifier directly gasifies the biomass, converting the carbon in the biomass into CO and CO2, which are then directly added to the methanol synthesis tower for reaction. This method boasts high biomass carbon utilization, low biomass carbon source consumption, and is entirely off-grid production, producing pure green methanol.

[0004] Furthermore, Chinese invention patent number 202510667313.0 discloses a system and method for preparing green methanol from biomass gasification. The present invention provides a method for preparing green methanol from biomass gasification, comprising the following steps: S1. Placing the treated biomass raw material into a biomass gasification device, simultaneously adding a predetermined mass of metal oxide into the reaction device and controlling the internal reaction temperature. Within the reaction device, the metal oxide decomposes to generate secondary metal oxides and O2. The generated O2 is then transported to the biomass gasification device 3 to provide oxygen for the biomass gasification reaction.

[0005] However, existing technologies have many bottlenecks: 1. Inadequate material utilization: In traditional biomass gasification to methanol processes, air is typically used as the gasifying agent, introducing a large amount of inert nitrogen, which reduces the concentration of effective components in the syngas and increases energy consumption for subsequent purification and compression. Although using pure oxygen as the gasifying agent can solve this problem, independent air separation units require large investments and consume a lot of energy. Furthermore, the large amount of high-purity oxygen produced as a byproduct of water electrolysis for hydrogen production is usually directly emitted, failing to achieve resource utilization.

[0006] 2. Insufficient energy integration: The biomass gasification process generates a large amount of high-temperature syngas, the sensible heat of which is usually consumed only by generating steam through a simple boiler or by direct cooling, failing to achieve efficient stage matching with other heat-requiring units in the system (such as methanol distillation). This results in a waste of high-grade thermal energy, and the overall thermal efficiency of the system needs to be improved.

[0007] However, the water supply and return systems currently used in PEM electrolyzers are separate units, operating independently without making proper use of the water purification unit on the supply side. After prolonged hydrogen production, trace amounts of catalyst may detach from the membrane electrode in the PEM electrolyzer, causing membrane electrode degradation. The existing water supply and return systems for PEM electrolyzers cannot monitor this degradation.

[0008] Therefore, there is an urgent need in this field for a biomass-based green methanol production device that can achieve deep coupling of materials and energy and fundamentally improve system energy efficiency. Summary of the Invention

[0009] The purpose of this invention is to overcome the shortcomings of the prior art and to provide a biomass-coupled green hydrogen to green methanol production device.

[0010] To achieve the above objectives, this utility model provides the following technical solution: A biomass-coupled green hydrogen to green methanol production device includes: a water electrolysis hydrogen production device, a biomass gasification device, a water-gas conversion device, a syngas purification device, a methanol synthesis device, a methanol separation device, a methanol distillation device, and a first heat exchanger. The water electrolysis hydrogen production device electrolyzes water to produce hydrogen and oxygen. It has an oxygen outlet and a hydrogen outlet. The oxygen outlet of the water electrolysis hydrogen production device is connected to the gasifying agent inlet of the biomass gasification device to provide oxygen. The hydrogen outlet of the water electrolysis hydrogen production device is connected to the inlet of the water-gas conversion device to provide hydrogen. The biomass gasification unit, the water-gas conversion unit, the syngas purification unit, the methanol synthesis unit, the methanol separation unit, and the methanol distillation unit are connected in sequence. The biomass gasification unit is used to gasify the treated biomass feedstock with oxygen to generate syngas. The water-gas conversion unit is used to adjust the hydrogen-to-carbon ratio in the syngas. The syngas purification unit is used to remove sulfides and carbon dioxide from the syngas. The methanol synthesis unit is used to catalytically synthesize crude methanol from the syngas. The methanol separation unit is used to separate crude methanol and unreacted syngas. The unreacted syngas is then fed back into the water-gas conversion unit. The methanol distillation unit is used to purify the crude methanol. The first heat exchanger is installed on the syngas outlet pipeline of the biomass gasification unit to recover the waste heat of the syngas and provide a heat source for the methanol distillation unit.

[0011] Preferably, the water electrolysis hydrogen production device is a solid oxide battery cell or a proton exchange membrane electrolyzer, with a solid oxide battery cell being more preferred.

[0012] Preferably, it further includes: a water tank storing pure water; a pure water vaporization device, wherein the outlet of the water tank is connected to the inlet of the pure water vaporization device, and the steam outlet of the pure water vaporization device is connected to the steam inlet of the water electrolysis hydrogen production device; and a second heat exchanger, which is installed on the syngas outlet pipeline of the biomass gasification device for recovering the waste heat of the syngas and providing a heat source for the pure water vaporization device.

[0013] Preferably, the biomass gasification device is an atmospheric pressure fluidized bed gasifier.

[0014] Preferably, the water-gas conversion device uses a high-efficiency conversion furnace.

[0015] Preferably, the methanol synthesis unit adopts a JJD water-pipe type isothermal low-pressure methanol synthesis tower.

[0016] Compared with related technologies, the biomass-coupled green hydrogen to green methanol device provided by this utility model has the following beneficial effects: 1. This utility model realizes the precise utilization of oxygen and hydrogen by-products from water electrolysis. The resource utilization of oxygen eliminates the need for an air separation unit, and the replenishment of hydrogen suppresses the generation of CO2 during the water-gas conversion process from the source. The system has high carbon atom economy and outstanding environmental benefits.

[0017] 2. Through the innovative design of the first and second heat exchangers, the heat of biomass gasification reaction is utilized in two efficient stages. First, steam is provided to the solid oxide battery cell, and then heat is provided for methanol distillation. This achieves "temperature matching and staged utilization" of energy, optimizes the overall thermal efficiency of the system, and significantly reduces operating costs. Attached Figure Description

[0018] Figure 1 A schematic diagram of a biomass-coupled green hydrogen to green methanol production unit.

[0019] Reference numerals in the attached drawings: 1. Electrolysis of water to produce hydrogen; 2. Biomass gasification unit; 3. Water-gas conversion unit; 4. Syngas purification unit; 5. Methanol synthesis unit; 6. Methanol separation unit; 7. Methanol distillation unit; 8. First heat exchanger; 9. Water tank; 10. Pure water vaporization unit; 11. Second heat exchanger; 12. Methanol tank. Detailed Implementation

[0020] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art are within the protection scope of this utility model.

[0021] In the description of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. The terms "connected" and "linked" used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. Example

[0023] like Figure 1 As shown, this embodiment provides a biomass-coupled green hydrogen to green methanol production device, including: an electrolysis water hydrogen production device 1, which electrolyzes water to produce hydrogen and oxygen, and has an oxygen outlet and a hydrogen outlet.

[0024] The biomass gasification unit 2 has its gasifying agent inlet connected to the oxygen outlet of the water electrolysis hydrogen production unit 1. The water electrolysis hydrogen production unit 1 provides oxygen, and the biomass gasification unit 2 is used to gasify the biomass feedstock, processed by heat pump drying technology, with oxygen to generate syngas. Biomass feedstock can include wheat straw, rice straw, sawdust, wood chips, etc.

[0025] The water-gas conversion unit 3, connected to the biomass gasification unit 2, is used to adjust the hydrogen-to-carbon ratio in the syngas. The hydrogen outlet of the water electrolysis hydrogen production unit 1 is connected to the inlet of the water-gas conversion unit 3 to provide hydrogen.

[0026] Syngas purification device 4, connected to water-gas conversion device 3, is used to remove sulfides and carbon dioxide from the syngas. The syngas generated by biomass gasification device 2 contains impurities such as carbon monoxide, hydrogen, carbon dioxide, water, and sulfides. Therefore, syngas purification device 4 is needed to purify the syngas to obtain purified gas mainly composed of carbon monoxide and hydrogen.

[0027] Methanol synthesis unit 5, which is connected to synthesis gas purification unit 4, is used to catalytically synthesize crude methanol from synthesis gas.

[0028] Methanol separation unit 6, which is connected to methanol synthesis unit 5, is used to separate crude methanol and unreacted synthesis gas.

[0029] The methanol distillation unit 7, which is connected to the methanol separation unit 6, is used to purify crude methanol to obtain pure methanol, which is then stored in the methanol tank 12.

[0030] The first heat exchanger 8 is installed on the syngas outlet pipeline of the biomass gasification unit 2 to recover the waste heat of the syngas and provide a heat source for the methanol distillation unit 7.

[0031] The above are merely preferred embodiments of the present utility model and do not limit the implementation methods and protection scope of the present utility model. The present utility model also has the following embodiments based on the above: In this embodiment, the water electrolysis hydrogen production device 1 is a solid oxide battery cell or a proton exchange membrane electrolyzer, preferably a solid oxide battery cell.

[0032] In this embodiment, a water tank 9, a pure water vaporization device 10, and a second heat exchanger 11 are also included. The water tank 9 stores the raw water used in the solid oxide battery cell. The outlet of the water tank 9 is connected to the inlet of the pure water vaporization device 10, which vaporizes the water into steam. The steam outlet of the pure water vaporization device 10 is connected to the steam inlet of the solid oxide battery cell to supply steam to the solid oxide battery cell. The second heat exchanger 11 is installed on the syngas outlet pipeline of the biomass gasification device 2 to recover the waste heat of the syngas and provide a heat source for the pure water vaporization device 10.

[0033] In this embodiment, the biomass gasification device 2 adopts an atmospheric pressure fluidized bed gasifier with a gasification temperature of 750-800℃ for pure oxygen gasification.

[0034] In this embodiment, the water-gas shift converter 3 employs a high-efficiency shift furnace. The volume ratio of hydrogen to carbon monoxide in the gas produced by the biomass gasification unit 2 is approximately 1:1. Methanol is prepared based on the carbon monoxide and hydrogen... As the equation shows, 1 volume of hydrogen needs to be added, so hydrogen is prepared by electrolysis of water to make up for the deficiency.

[0035] In this embodiment, the syngas purification device 4 adopts a low-temperature methanol washing process with an operating temperature of -40~-50℃, and methanol needs to be introduced into the device as a coolant.

[0036] In this embodiment, the methanol synthesis unit 5 adopts a JJD water-pipe type isothermal low-pressure methanol synthesis tower. The water electrolysis hydrogen production unit 1, biomass gasification unit 2, water-gas conversion unit 3, syngas purification unit 4, methanol synthesis unit 5, methanol separation unit 6, methanol distillation unit 7, and heat exchanger are all commercially available products, and their specific structures and control methods are not described in detail here.

[0037] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be within the scope of protection of the pending claims of the present utility model.

Claims

1. A biomass-coupled green hydrogen to green methanol production unit, characterized in that, include: Electrolysis water hydrogen production unit (1), biomass gasification unit (2), water gas conversion unit (3), syngas purification unit (4), methanol synthesis unit (5), methanol separation unit (6), methanol distillation unit (7), and first heat exchanger (8); The oxygen outlet of the water electrolysis hydrogen production device (1) is connected to the gasifying agent inlet of the biomass gasification device (2), and the hydrogen outlet of the water electrolysis hydrogen production device (1) is connected to the inlet of the water-gas conversion device (3). The biomass gasification device (2), the water-gas conversion device (3), the syngas purification device (4), the methanol synthesis device (5), the methanol separation device (6), and the methanol distillation device (7) are connected in sequence; The first heat exchanger (8) is installed on the syngas outlet pipeline of the biomass gasification device (2) to recover the waste heat of the syngas and provide a heat source for the methanol distillation device (7).

2. The biomass-coupled green hydrogen to green methanol production device according to claim 1, characterized in that, The water electrolysis hydrogen production device (1) is a solid oxide battery cell.

3. The biomass-coupled green hydrogen to green methanol production device according to claim 2, characterized in that, Also includes: Water tank (9), wherein pure water is stored in water tank (9); Pure water vaporization device (10), the outlet of the water tank (9) is connected to the inlet of the pure water vaporization device (10), and the steam outlet of the pure water vaporization device (10) is connected to the steam inlet of the water electrolysis hydrogen production device (1). The second heat exchanger (11) is installed on the syngas outlet pipeline of the biomass gasification device (2) to recover the waste heat of the syngas and provide a heat source for the pure water vaporization device (10).

4. The biomass-coupled green hydrogen to green methanol production device according to claim 1, characterized in that, The biomass gasification device (2) adopts an atmospheric pressure fluidized bed gasifier.

5. The biomass-coupled green hydrogen to green methanol production device according to claim 1, characterized in that, The water-gas conversion device (3) adopts a high-efficiency conversion furnace.

6. The biomass-coupled green hydrogen to green methanol production device according to claim 1, characterized in that, The methanol synthesis unit (5) adopts a JJD water pipe type isothermal low-pressure methanol synthesis tower.

Images