Device for producing green ammonia alcohol by oxidizing and separating purified air gasified biomass

Abstract

The utility model discloses a device for producing green ammonia alcohol by oxidizing and separating purified air gasified biomass, which comprises a biomass gasifier, a dust removal heat exchanger, a first spraying and washing purifier, an electrostatic decoking device, a synthesis gas oxidizing furnace, a second spraying and washing purifier, a carbon dioxide and nitrogen storage cabinet and a carbon dioxide and nitrogen separator, the carbon dioxide and nitrogen separator is respectively connected with a carbon dioxide storage cabinet and a nitrogen storage cabinet through pipelines, and the carbon dioxide storage cabinet and the nitrogen storage cabinet are respectively connected with a green methanol catalytic synthesis reactor and a green ammonia catalytic synthesis reactor; the output ends of the green methanol catalytic synthesis reactor and the green ammonia catalytic synthesis reactor are respectively connected with a green methanol storage tank and a green ammonia storage tank. According to the utility model, the maintenance cost of equipment is reduced: through a mode of firstly cooling, dedusting and decoking and then combusting and oxidizing, dust adhesion and tar cracking and coking are effectively avoided, the abrasion to the equipment is reduced, and the maintenance frequency and cost of the equipment are reduced.

Description

Technical Field

[0001] This utility model relates to the field of biomass energy utilization technology, specifically to an apparatus for producing green ammonia by purifying biomass through air gasification and then oxidizing and separating it. Background Technology

[0002] Currently, the main energy utilization methods for biomass energy are fermentation to produce fuel and biogas, gasification, rapid pyrolysis, and carbonization.

[0003] In the process of pyrolyzing biomass raw materials, the initial stage of the biomass gasification furnace is high-temperature gas, with an internal temperature of 700-800 degrees Celsius. The gas contains tar (which is in a gaseous state at this time). In order to effectively use this green gas to replace fossil fuels, the high-temperature gas needs to be cooled to room temperature before it can be transported to user equipment through pipelines.

[0004] The existing biomass gasification synthesis of green methanol using biomass gasifiers requires deep treatment of the biomass syngas. Because the biomass syngas produced by existing technologies contains tar, tar removal is required during the purification process. In addition, carbon monoxide and nitrogen have similar boiling points, making separation difficult and costly.

[0005] Furthermore, before the high-temperature syngas from biomass gasification is purified, the syngas contains gaseous tar. As the temperature decreases with spray washing, some tar condenses and mixes with the wastewater. Removing this liquid tar from the wastewater increases purification costs. After biomass gasification, the combustible components (carbon monoxide, hydrogen, and methane) in the high-temperature syngas undergo a complete oxidation system, completely oxidizing them. Nitrogen in the syngas does not participate in the reaction, ultimately yielding a mixture of carbon dioxide and nitrogen. The separation cost of carbon dioxide and nitrogen is relatively low, thus reducing the cost of producing green methanol.

[0006] However, the above-mentioned biomass gasification treatment method has many drawbacks. After biomass gasification, it is often directly burned at high temperatures before dust and coke removal and purification are carried out. In terms of dust removal, this method will increase the surface activity of dust in the syngas due to high temperature, resulting in stronger dust adhesion. This not only easily clogs the filter elements of the dust collector, reducing filtration efficiency, but also increases the difficulty of dust removal.

[0007] Meanwhile, high temperatures can cause thermal deformation of the dust collector's metal components, affecting equipment operation and sealing performance, exacerbating internal wear, and shortening the equipment's lifespan. Regarding tar removal, high temperatures promote tar decomposition, producing more complex compounds that coke on pipe and equipment surfaces, clogging the equipment, reducing heat exchange efficiency, increasing energy loss, and lowering tar viscosity at high temperatures, making it easier to mix with dust and increasing the difficulty of tar treatment. Furthermore, using pure oxygen as a gasifying agent significantly increases the cost of the gasifying agent. Summary of the Invention

[0008] The purpose of this invention is to provide an apparatus for producing green ammonia and alcohol by purifying biomass through air gasification and then oxidizing and separating it, so as to solve the problems mentioned in the background art.

[0009] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an apparatus for producing green ammonia and alcohol by purifying biomass through air gasification and then oxidizing and separating it, comprising a biomass gasification furnace, wherein the exhaust end of the biomass gasification furnace is connected to the inlet end of a dust removal heat exchanger via a pipe, the exhaust end of the dust removal heat exchanger is connected to a first spray water washing purifier via a pipe, the output end of the first spray water washing purifier is connected to an electrostatic precipitator, the output end of the electrostatic precipitator is connected to a syngas oxidation furnace via a Roots blower, the output end of the syngas oxidation furnace is connected to a second spray water washing purifier, and the output of the second spray water washing purifier... The outlet is connected to a secondary purification system via a pipeline. The output of the secondary purification system is connected to a carbon dioxide and nitrogen storage tank via a Roots blower. The output of the carbon dioxide and nitrogen storage tank is connected to a carbon dioxide and nitrogen separator. The output of the carbon dioxide and nitrogen separator is connected to a carbon dioxide storage tank and a nitrogen storage tank via pipelines, respectively. The outputs of the carbon dioxide and nitrogen storage tanks are connected to a green methanol catalytic synthesis reactor and a green ammonia catalytic synthesis reactor, respectively. The outputs of the green methanol catalytic synthesis reactor and the green ammonia catalytic synthesis reactor are connected to a green methanol storage tank and a green ammonia storage tank, respectively.

[0010] In a preferred embodiment, the dust removal heat exchanger is a two-stage cyclone dust removal heat exchanger.

[0011] In a preferred embodiment, the waste heat recovery from the dust removal heat exchanger, the second spray water washing purifier, and the syngas oxidation furnace is used for heat and power cooling supply and cooling of the carbon dioxide and nitrogen separator.

[0012] In a preferred embodiment, the secondary purification system comprises filter filtration and activated carbon adsorption.

[0013] In a preferred embodiment, the carbon dioxide and nitrogen separator is a pressure swing adsorption separator, a membrane separator, or a cryogenic separator.

[0014] In a preferred embodiment, the input ends of the green methanol catalytic synthesis reactor and the green ammonia catalytic synthesis reactor are connected to a green hydrogen storage tank via pipelines. Green hydrogen is added to the green methanol catalytic synthesis reactor to synthesize green methanol, and green hydrogen is added to the green ammonia catalytic synthesis reactor to synthesize green ammonia.

[0015] Compared with the prior art, the beneficial effects achieved by this utility model are:

[0016] This invention reduces equipment maintenance costs: by first cooling, removing dust and coke, and then burning and oxidizing, it effectively avoids dust adhesion and tar cracking and coking, reduces wear on equipment, and lowers the frequency and cost of equipment maintenance.

[0017] This invention utilizes the waste heat generated by combustion oxidation for refrigeration, heating, or power generation, realizing multi-level energy utilization and improving the energy efficiency of the entire production process.

[0018] This invention uses air as a gasifying agent, which significantly reduces the cost of the gasifying agent and also reduces the increase in production costs caused by equipment failure and high-cost gasifying agents. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a schematic diagram of the system structure of this utility model.

[0021] In the diagram: 1. Biomass gasification furnace; 2. Dust removal heat exchanger; 3. First spray water washing purifier; 4. Electrostatic precipitator; 5. Roots blower; 6. Syngas oxidation furnace; 7. Second spray water washing purifier; 8. Secondary purification system; 9. Carbon dioxide and nitrogen storage tank; 10. Carbon dioxide and nitrogen separator; 11. Carbon dioxide storage tank; 12. Nitrogen storage tank; 13. Green methanol catalytic synthesis reactor; 14. Green ammonia catalytic synthesis reactor; 15. Green methanol storage tank; 16. Green ammonia storage tank. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1This utility model provides an apparatus for producing green ammonia and alcohols by purifying biomass through air gasification and then oxidizing and separating it. The apparatus includes a biomass gasifier 1. The exhaust end of the biomass gasifier 1 is connected to the inlet end of a dust collector heat exchanger 2 via a pipe. The exhaust end of the dust collector heat exchanger 2 is connected to a first spray water scrubbing purifier 3 via a pipe. The output end of the first spray water scrubbing purifier 3 is connected to an electrostatic precipitator 4. The output end of the electrostatic precipitator 4 is connected to a syngas oxidation furnace 6 via a Roots blower 5. The output end of the syngas oxidation furnace 6 is connected to a second spray water scrubbing purifier 7. The output end of the second spray water scrubbing purifier 7 is connected to a secondary purification system 8 via a pipe. The output of the secondary purification system 8 is connected to a carbon dioxide and nitrogen storage tank 9 via a Roots blower 5. The output of the carbon dioxide and nitrogen storage tank 9 is connected to a carbon dioxide and nitrogen separator 10. The output of the carbon dioxide and nitrogen separator 10 is connected to a carbon dioxide storage tank 11 and a nitrogen storage tank 12 via pipelines. The outputs of the carbon dioxide storage tank 11 and the nitrogen storage tank 12 are connected to a green methanol catalytic synthesis reactor 13 and a green ammonia catalytic synthesis reactor 14, respectively. The outputs of the green methanol catalytic synthesis reactor 13 and the green ammonia catalytic synthesis reactor 14 are connected to a green methanol storage tank 15 and a green ammonia storage tank 16, respectively.

[0024] In a preferred embodiment, the dust removal heat exchanger 2 is a two-stage cyclone dust removal heat exchanger.

[0025] In a preferred embodiment, the waste heat from the dust removal heat exchanger 2, the second spray water washing purifier 7, and the syngas oxidation furnace 4 is recovered for heat and electricity cooling supply and cooling of the carbon dioxide and nitrogen separator 10.

[0026] In a preferred embodiment, the secondary purification system 8 consists of filter filtration and activated carbon adsorption.

[0027] In a preferred embodiment, the carbon dioxide and nitrogen separator 10 is a pressure swing adsorption separator, a membrane separator, or a cryogenic separator.

[0028] In a preferred embodiment, the input ends of the green methanol catalytic synthesis reactor 13 and the green ammonia catalytic synthesis reactor 14 are connected to a green hydrogen storage tank via pipelines. Green hydrogen is added to the green methanol catalytic synthesis reactor 13 to synthesize green methanol, and green hydrogen is added to the green ammonia catalytic synthesis reactor 14 to synthesize green ammonia.

[0029] The working principle of this utility model:

[0030] 1. Biomass gasification operation: Pre-treated biomass raw materials, such as crop straw and forestry waste, are fed into the biomass gasifier 1 at a certain feeding rate. The air intake is adjusted to ensure that the biomass raw materials react fully in the biomass gasifier 1, and the gasification temperature is controlled within a suitable range to ensure the efficient execution of the gasification reaction.

[0031] 2. Operation: After dust removal and heat exchange, the syngas produced by gasification enters the gasification syngas spray washing system at a certain flow rate. The flow rate and pressure of the spray water are adjusted according to the flow rate and impurity content of the syngas to ensure effective removal of dust and some tar. The syngas then enters the gasification syngas electrostatic tar removal system, where the voltage and current parameters of the electrostatic tar removal equipment are adjusted to achieve deep removal of remaining tar.

[0032] 3. Oxidation and heat exchange operations: The purified fuel gas enters stage 6, and the air volume during combustion is controlled to ensure complete combustion. The heat generated during combustion is recovered using a heat exchanger, and the waste heat is used for cooling, heating, or power generation as needed.

[0033] 4. Separation and Synthesis Operations: The oxidized gas enters reactor 10. Based on the characteristics of the separation technology, the operating parameters of pressure swing adsorption separation, membrane separation, or cryogenic separation equipment are set to achieve efficient separation and purification of carbon dioxide and nitrogen. The separated carbon dioxide and nitrogen are then fed into the synthesis reactor along with hydrogen in a certain proportion. The reaction temperature, pressure, and catalyst dosage are controlled to ensure the smooth progress of the synthesis reaction, yielding high-purity green ammonia and green alcohol.

[0034] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An apparatus for producing green ammonia and alcohols by purifying biomass through air gasification and then oxidizing and separating it, comprising a biomass gasification furnace (1), characterized in that, The exhaust end of the biomass gasifier (1) is connected to the inlet end of the dust removal heat exchanger (2) via a pipe. The exhaust end of the dust removal heat exchanger (2) is connected to a first spray water washing purifier (3) via a pipe. The output end of the first spray water washing purifier (3) is connected to an electrostatic precipitator (4). The output end of the electrostatic precipitator (4) is connected to a syngas oxidizer (6) via a Roots blower (5). The output end of the syngas oxidizer (6) is connected to a second spray water washing purifier (7). The output end of the second spray water washing purifier (7) is connected to a secondary purification system (8) via a pipe. The output end of the secondary purification system (8) is connected to a Roots blower (5). A carbon dioxide and nitrogen storage tank (9) is connected to a carbon dioxide and nitrogen separator (10). The output end of the carbon dioxide and nitrogen separator (10) is connected to a carbon dioxide storage tank (11) and a nitrogen storage tank (12) respectively through pipelines. The output ends of the carbon dioxide storage tank (11) and the nitrogen storage tank (12) are respectively connected to a green methanol catalytic synthesis reactor (13) and a green ammonia catalytic synthesis reactor (14). The output ends of the green methanol catalytic synthesis reactor (13) and the green ammonia catalytic synthesis reactor (14) are respectively connected to a green methanol storage tank (15) and a green ammonia storage tank (16).

2. The apparatus for producing green ammonia alcohol by air gasification of biomass, purification and re-oxidation separation according to claim 1, characterized in that, The dust removal heat exchanger (2) adopts a two-stage cyclone dust removal heat exchanger.

3. The apparatus for producing green ammonia alcohol by air gasification of biomass, purification and re-oxidation separation according to claim 1, characterized in that, The waste heat recovery from the dust removal heat exchanger (2), the second spray water washing purifier (7) and the syngas oxidation furnace (4) is used for heat and electricity cooling supply and cooling of the carbon dioxide and nitrogen separator (10).

4. The apparatus for producing green ammonia alcohol by air gasification of biomass, purification and re-oxidation separation according to claim 1, characterized in that, The secondary purification system (8) consists of filter filtration and activated carbon adsorption.

5. The apparatus for producing green ammonia alcohol by air gasification of biomass, purification and re-oxidation separation according to claim 1, characterized in that, The carbon dioxide and nitrogen separator (10) is a pressure swing adsorption separator, a membrane separator, or a cryogenic separator.

6. The apparatus for producing green ammonia alcohol by air gasification of biomass, purification and re-oxidation separation according to claim 1, characterized in that, The input ends of the green methanol catalytic synthesis reactor (13) and the green ammonia catalytic synthesis reactor (14) are connected to the green hydrogen storage tank through pipelines. Green hydrogen is added to the green methanol catalytic synthesis reactor (13) to synthesize green methanol, and green hydrogen is added to the green ammonia catalytic synthesis reactor (14) to synthesize green ammonia.

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