System for preparing green methanol from biomass

Abstract

The utility model discloses a system for preparing green methanol from biomass, which comprises a feeding device, an anaerobic fermentation device, a biogas holder, a conversion reactor, a methanol synthesis tower and a methanol power generation device which are sequentially communicated, the anaerobic fermentation device is provided with a biogas slurry and biogas residue outlet, and the biogas holder is provided with three groups of biogas outlets. Wherein one group of outlets are communicated with the conversion reactor, the other two groups of outlets are respectively communicated with a biogas power generation device and a biogas boiler, and the biogas power generation device and the methanol power generation device are both connected with the power grid. The biomass anaerobic fermentation device has the advantages that the biomass anaerobic fermentation is used for preparing green methanol, high-value utilization of biomass is realized, efficient development and utilization of biomass energy are realized, and the biomass anaerobic fermentation device has important significance for improving the ecological environment in China, establishing a sustainable energy system and promoting economic and social development.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, in particular to a system for preparing green methanol from biomass. Background Art

[0002] With the rapid development of my country's economy, energy demand has grown rapidly, and the resulting energy shortages and environmental pollution caused by excessive consumption of fossil energy have become increasingly prominent. In order to cope with the greenhouse effect and the environmental and climate changes it brings. my country has proposed the goal of achieving carbon peak in 2030 and carbon neutrality before 2060. As an environmentally friendly renewable energy source, biomass can perfectly meet the needs of the dual carbon goals, and has more environmental and economic advantages than fossil fuels (coal, oil and natural gas). First, biomass provides a continuous supply of raw materials and will not be affected by fluctuations in world energy prices or uncertainties in the supply of imported fuels, which can reduce dependence on fossil fuels. Secondly, biomass is a carbon dioxide (CO2) neutral energy throughout its life cycle, with the advantage of net zero CO2 emissions.

[0003] Due to its low price and easy availability, rural areas in developing countries rely primarily on biomass as fuel to meet household needs. However, direct combustion of biomass emits large amounts of particulate matter, greenhouse gases such as carbon dioxide and nitrous oxide, as well as gaseous pollutants such as carbon monoxide, sulfur oxides, and nitrogen oxides, causing serious environmental pollution and impacting human health. Biomass can be converted into products with higher utilization value and better environmental performance through physical, chemical, or biological conversion pathways, providing an effective way to achieve green development of biomass resources and replace fossil energy. Utility Model Content

[0004] The purpose of this utility model is to provide a system for preparing green methanol from biomass, which utilizes biomass anaerobic fermentation to prepare green methanol, realizes high-value utilization of biomass, and realizes efficient development and utilization of biomass energy, which will be of great significance to improving my country's ecological environment, establishing a sustainable energy system, and promoting economic and social development.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] A system for preparing green methanol from biomass is characterized by comprising a feeding device, an anaerobic fermentation device, a biogas gas holder, a conversion reactor, a methanol synthesis tower and a methanol power generation device connected in sequence, wherein the anaerobic fermentation device is provided with a biogas slurry and residue outlet, the biogas gas holder is provided with three groups of biogas outlets, one group of which is connected to the conversion reactor, and the other two groups of outlets are respectively connected to a biogas power generation device and a biogas boiler, and the biogas power generation device and the methanol power generation device are both connected to the power grid.

[0007] Preferably, a pretreatment device is further provided between the feeding device and the anaerobic fermentation device, the pretreatment device is provided with a debris outlet, and a purification device is further provided between the anaerobic fermentation device and the biogas tank.

[0008] Preferably, the biogas boiler is provided with a steam outlet connected to the conversion reactor.

[0009] Preferably, the flue gas outlets of the biogas boiler and the biogas power generation device are both connected to a first flue gas buffer tank, the flue gas outlet of the first flue gas buffer tank is sequentially connected to a first carbon dioxide recovery device and a first carbon dioxide storage tank, and the outlet of the first carbon dioxide storage tank is connected to the conversion reactor.

[0010] Preferably, a synthesis gas storage tank and a compressor are connected in sequence between the conversion reactor and the methanol synthesis tower.

[0011] Preferably, the unreacted gas in the methanol synthesis tower flows back to the compressor through a pipeline.

[0012] Preferably, the methanol synthesis tower and the methanol power generation device are connected in sequence to a methanol distillation tower and a methanol storage tank, and the methanol storage tank is provided with a methanol sales outlet.

[0013] Preferably, the flue gas outlet of the methanol power generation device is also connected in sequence to a second flue gas buffer tank, a second carbon dioxide recovery device and a second carbon dioxide storage tank, and the outlet of the second carbon dioxide storage tank is connected to the conversion reactor.

[0014] In summary, the present invention has the following beneficial effects:

[0015] The utility model couples an anaerobic fermentation system, a carbon dioxide capture system and a methanol synthesis system to each other, thereby realizing biomass treatment, carbon dioxide emission reduction and green methanol synthesis.

[0016] The utility model adopts biomass anaerobic fermentation, which not only utilizes biomass fuel but also provides raw materials for methanol synthesis. Almost no carbon dioxide is released during the methanol synthesis process, thus achieving zero carbon emission of methanol synthesis.

[0017] The utility model utilizes biogas power generation and methanol power generation to provide power demand for the entire system. At the same time, the generated electricity can be transmitted to the power grid, realizing off-grid operation of green methanol production. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the utility model;

[0019] In the figure, 1 is a feeding device, 2 is a pretreatment device, 3 is an anaerobic fermentation device, 4 is a purification device, 5 is a biogas gas holder, 6 is a biogas power generation device, 7 is a power grid, 8 is a biogas boiler, 9 is a first flue gas buffer tank, 10 is a first carbon dioxide recovery device, 11 is a first carbon dioxide storage tank, 12 is a conversion reactor, 13 is a synthesis gas storage tank, 14 is a compressor, 15 is a methanol synthesis tower, 16 is a methanol distillation tower, 17 is a methanol storage tank, 18 is a methanol power generation device, 19 is a second flue gas buffer tank, 20 is a second carbon dioxide recovery device, and 21 is a second carbon dioxide storage tank. DETAILED DESCRIPTION

[0020] The following further describes the specific implementation of the present invention in conjunction with the accompanying drawings. This embodiment does not constitute a limitation to the present invention.

[0021] like Figure 1 As shown, a system for preparing green methanol from biomass includes a feeding device 1, an anaerobic fermentation device 3, a biogas gas cabinet 5, a conversion reactor 12, a methanol synthesis tower 15 and a methanol power generation device 18 connected in sequence. The anaerobic fermentation device 3 is provided with a biogas slurry and residue outlet, and the biogas gas cabinet 5 is provided with three groups of biogas outlets, one group of which is connected to the conversion reactor 12, and the other two groups of outlets are respectively connected to a biogas power generation device 6 and a biogas boiler 8. The biogas power generation device 6 and the methanol power generation device 18 are both connected to the power grid 7.

[0022] A pretreatment device 2 is further provided between the feeding device 1 and the anaerobic fermentation device 3 . The pretreatment device 2 is provided with a debris outlet. A purification device 4 is further provided between the anaerobic fermentation device 3 and the biogas tank 5 .

[0023] The biogas boiler 8 is provided with a steam outlet connected to the conversion reactor 12 .

[0024] The flue gas outlets of the biogas boiler 8 and the biogas power generation device 6 are both connected to the first flue gas buffer tank 9, and the flue gas outlet of the first flue gas buffer tank 9 is connected to the first carbon dioxide recovery device 10 and the first carbon dioxide storage tank 11 in turn, and the outlet of the first carbon dioxide storage tank 11 is connected to the conversion reactor 12.

[0025] A synthesis gas storage tank 13 and a compressor 14 are connected in sequence between the conversion reactor 12 and the methanol synthesis tower 15 .

[0026] The unreacted gas in the methanol synthesis tower 15 flows back to the compressor 14 through a pipeline.

[0027] The methanol synthesis tower 15 and the methanol power generation device 18 are connected in sequence to a methanol distillation tower 16 and a methanol storage tank 17, and the methanol storage tank 17 is provided with a methanol sales outlet.

[0028] The flue gas outlet of the methanol power generation device 18 is also connected in sequence to the second flue gas buffer tank 19 , the second carbon dioxide recovery device 20 and the second carbon dioxide storage tank 21 , and the outlet of the second carbon dioxide storage tank 21 is connected to the conversion reactor 12 .

[0029] The workflow of this utility model is:

[0030] After the biomass enters the factory and is weighed, it is unloaded into the feeding device 1 for storage, and then transported to the pretreatment device 2 for crushing and pulping, sand removal and impurity removal. The separated impurities are incinerated or landfilled through the outlet. The slurry after impurities are removed is pumped into the anaerobic fermentation device 3 to realize the degradation and transformation of organic matter. The biogas generated by anaerobic fermentation is transported to the purification device 4 to remove some solid dust particles and liquids that may be carried by the gas, and reduce the hydrogen sulfide concentration to below 20ppm. The purified biogas then enters the biogas tank 5. The biogas slurry and residue produced by anaerobic fermentation can be returned to the field or soil improvement after resource treatment. The biogas temporarily stored in the biogas tank 5 is divided into three parts for utilization. Part of the biogas is used for conversion and reforming in the conversion reactor 12, and another part of the biogas enters the biogas power generation device 6 to generate electricity. The generated electricity is used first in the factory, and the remaining part is transported to the power grid 7. Another part of the biogas enters the biogas boiler 8, and the generated steam is provided to the conversion reactor 12 for biogas reforming and conversion.

[0031] The flue gas generated by the biogas power generation device 6 and the biogas boiler 8 is collected and enters the first flue gas buffer tank 9, and then enters the first carbon dioxide recovery device 10 to recover carbon dioxide. The purified carbon dioxide enters the first carbon dioxide storage tank 11, and the recovered high-purity carbon dioxide (carbon dioxide purity ≥98.5%), steam and biogas in the biogas tank 5 enter the conversion reactor 12 for reforming to obtain a molar ratio of CO and H2 of 1:2. The reformed synthesis gas enters the synthesis gas storage tank 13, and after temporary buffering, enters the compressor 14. The pressurized synthesis gas enters the methanol synthesis tower 15, and the synthesized crude methanol enters the methanol distillation tower 16. The unreacted gas in the methanol synthesis process enters the compressor 14 as circulating gas. The purified methanol enters the storage device 17, and part of the green methanol obtained is sold as a product, and part enters the methanol power generation device 18 to generate electricity and enter the power grid 7. The flue gas generated by power generation enters the second flue gas buffer tank 19, and then enters the second carbon dioxide recovery device 20. The purified carbon dioxide enters the second carbon dioxide storage tank 21. The high-purity carbon dioxide (carbon dioxide purity ≥98.5%) temporarily stored in the second carbon dioxide storage tank 21 is transported to the conversion reactor 12 for conversion and reforming. The high-purity carbon dioxide in the second carbon dioxide storage tank 21 can also be used as a supplementary carbon source for the conversion reaction.

[0032] The purpose of this utility model is to provide a system for producing green methanol from biomass. Through a complete system consisting of an anaerobic fermentation system, a carbon dioxide capture system, a biogas conversion system, and a methanol synthesis system, the system converts biomass into high-quality green methanol, reducing carbon dioxide emissions and achieving the goal of clean production. By converting waste biomass into high-quality green methanol, it can partially replace fossil fuels such as oil and coal, playing a significant role in alleviating the energy crisis, reducing environmental pollution, and promoting sustainable social development.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions should also be deemed to fall within the protection scope of the technical solution of the present invention.

Claims

1. A system for producing green methanol from biomass, characterized in that: It includes a feeding device, an anaerobic fermentation device, a biogas gas holder, a conversion reactor, a methanol synthesis tower and a methanol power generation device connected in sequence. The anaerobic fermentation device is provided with a biogas slurry and residue outlet. The biogas gas holder is provided with three groups of biogas outlets, one group of which is connected to the conversion reactor, and the other two groups of outlets are respectively connected to a biogas power generation device and a biogas boiler. The biogas power generation device and the methanol power generation device are both connected to the power grid.

2. The system for producing green methanol from biomass according to claim 1, characterized in that: A pretreatment device is further provided between the feeding device and the anaerobic fermentation device, and the pretreatment device is provided with a debris outlet. A purification device is further provided between the anaerobic fermentation device and the biogas tank.

3. The system for producing green methanol from biomass according to claim 1, characterized in that: The biogas boiler is provided with a steam outlet which is in communication with the conversion reactor.

4. The system for producing green methanol from biomass according to claim 1, characterized in that: The flue gas outlets of the biogas boiler and the biogas power generation device are both connected to a first flue gas buffer tank, the flue gas outlet of the first flue gas buffer tank is sequentially connected to a first carbon dioxide recovery device and a first carbon dioxide storage tank, and the outlet of the first carbon dioxide storage tank is connected to a conversion reactor.

5. The system for producing green methanol from biomass according to claim 1, characterized in that: A synthesis gas storage tank and a compressor are connected in sequence between the conversion reactor and the methanol synthesis tower.

6. The system for producing green methanol from biomass according to claim 4, characterized in that: The unreacted gas in the methanol synthesis tower flows back to the compressor through a pipeline.

7. The system for producing green methanol from biomass according to claim 1, characterized in that: The methanol synthesis tower and the methanol power generation device are connected in sequence with a methanol distillation tower and a methanol storage tank, and the methanol storage tank is provided with a methanol sales outlet.

8. The system for producing green methanol from biomass according to claim 1, characterized in that: The flue gas outlet of the methanol power generation device is also connected in sequence to a second flue gas buffer tank, a second carbon dioxide recovery device and a second carbon dioxide storage tank, and the outlet of the second carbon dioxide storage tank is connected to the conversion reactor.

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