Green electricity coupled biomass chemical chain directional gasification natural gas and methanol production system

Abstract

The invention discloses a system for preparing natural gas and methanol through green electricity coupled biomass chemical chain directional gasification. The system comprises a new energy green electricity module, a water electrolysis module, a biomass chemical chain gasification module, a methanol synthesis module and a natural gas synthesis module. The new energy green electricity module is respectively connected with the water electrolysis module, the biomass chemical chain gasification module, the methanol synthesis module and the natural gas synthesis module; the new energy green power module comprises a wind power generation part and a photovoltaic power generation part; the water electrolysis module comprises a hydrogen outlet and an oxygen outlet, the hydrogen outlet is connected with the methanol synthesis module, and the oxygen outlet is connected with the biomass chemical chain gasification module; the biomass chemical chain gasification module comprises a gasified gas outlet and an oxidized gas outlet, the gasified gas outlet is connected with the natural gas synthesis module, and the oxidized gas outlet is connected with the methanol synthesis module; the invention provides an integrated solution for participation of green power consumption, biomass quality improvement and long-time energy storage in power grid auxiliary service, and new energy consumption and clean replacement of electric energy are promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of rural distributed renewable energy power generation and comprehensive utilization of agricultural and forestry residues, and specifically to a green electricity coupled biomass chemical chain directional gasification system for producing natural gas and methanol. Background Art

[0002] In the context of global energy structure transformation and climate change response, the application of clean energy technology has become increasingly important. Photovoltaic and wind power, as the main forms of new energy, have been widely used around the world. However, due to the influence of weather and day and night changes, wind and photovoltaic power generation are volatile and intermittent, which poses challenges to the security of the power grid and affects the stable operation of the power grid and the quality of power.

[0003] At the same time, as an important new energy source, biomass has shown great potential in replacing fossil energy due to its rich resources and carbon neutrality. Traditional biomass gasification technology converts biomass into combustible gas through high-temperature cracking and partial oxidation, but the gas composition produced during the gasification process is complex, which makes its subsequent utilization and product quality improvement difficult.

[0004] The present invention proposes a green electricity coupled biomass chemical chain directional gasification system for producing natural gas and methanol. The system uses intermittent green electricity to drive water electrolysis to produce hydrogen, and introduces the oxygen generated in the electrolysis process into the biomass chemical chain gasification process, thereby achieving efficient conversion of biomass and precise regulation of gas components. The energy efficiency of the system is further improved by using the gasification gas produced by the biomass chemical chain gasification for natural gas preparation, and combining the oxidizing gas with the hydrogen generated by water electrolysis to synthesize methanol. The present invention not only effectively solves the problem of green electricity consumption, but also provides a clean and efficient biomass resource quality improvement and utilization path, promoting the coordinated development of new energy and biomass resources. Summary of the invention

[0005] The present invention aims to solve the problems of low efficiency and resource waste in the current renewable energy power generation and biomass utilization process. In order to achieve the above purpose, the present invention provides the following technical solutions:

[0006] A green electricity coupled biomass chemical chain directional gasification system for producing natural gas and methanol, comprising a new energy green electricity module, a water electrolysis module, a biomass chemical chain gasification module, a synthetic methanol module and a synthetic natural gas module, wherein the new energy green electricity module is connected to the water electrolysis module, the biomass chemical chain gasification module, the synthetic methanol module and the synthetic natural gas module respectively;

[0007] The new energy green electricity module includes a wind power generation system or a photovoltaic power generation system;

[0008] The water electrolysis module comprises a hydrogen outlet and an oxygen outlet, wherein the hydrogen outlet is connected to the synthetic methanol module; and the oxygen outlet is connected to the biomass chemical chain gasification module;

[0009] The biomass chemical chain gasification module comprises a gasification gas outlet and an oxidation gas outlet, the gasification gas outlet is connected to the synthetic natural gas module, and the oxidation gas outlet is connected to the synthetic methanol module;

[0010] The synthetic methanol module comprises a water outlet, and the water outlet is respectively connected to the water electrolysis module and the biomass chemical chain gasification module.

[0011] Furthermore, the water electrolysis module includes a proton exchange membrane electrolyzer and a heater, the inlet of the heater is connected to the synthetic methanol module, and the outlet of the heater is connected to the proton exchange membrane electrolyzer; the heater dynamically adjusts the water supply temperature of the synthetic methanol module so that its outlet temperature is controlled at 80°C-90°C.

[0012] Furthermore, the biomass chemical chaining gasification module includes a biomass silo, a chemical chaining gasification reactor and an air reactor; the biomass silo is connected to the chemical chaining gasification reactor; after crushing and screening, the biomass is fully mixed with the CaO / Fe2O3 in the chemical chaining gasification reactor to achieve a catalytic gasification reaction; by adjusting the CaO / Fe2O3 ratio and the ratio of water to biomass fuel, the chemical chaining gasification reactor is controlled to adapt to different types of biomass to achieve directional gasification to generate gasified gas with H2:CO≥3:1; the solid residue outlet of the chemical chaining gasification reactor is connected to the air reactor, and the gasified gas outlet is connected to the synthetic natural gas module.

[0013] Furthermore, the fixed residue in the air reactor is fully burned with oxygen to generate CO2-rich oxidizing gas and re-oxidized CaO / Fe2O3; the CaO / Fe2O3 outlet of the air reactor is connected to a chemical chain gasification reactor, and the oxidizing gas outlet is connected to the synthetic methanol module.

[0014] Furthermore, the synthetic methanol module includes a gas compressor, a water tank, a methanol synthesis reactor, a methanol distillation device and a methanol storage tank. The gas compressor inlet is respectively connected to the hydrogen outlet of the water electrolysis module and the oxidation gas outlet of the biomass chemical chain module, and the gas compressor outlet is sequentially connected to the methanol synthesis reactor, the methanol distillation device and the methanol storage tank; the water in the water tank is divided into two flows, one of which is input into the water electrolysis module through the cooling pipe of the methanol synthesis reactor; and the other is connected to the biomass chemical chain module.

[0015] Furthermore, the synthetic natural gas module includes a methanation reactor and a natural gas storage tank, the inlet of the methanation reactor is connected to the biomass gasification module, and the outlet of the methanation reactor is connected to the natural gas storage tank.

[0016] The beneficial effects of the technical solution are:

[0017] 1. The present invention provides a green electricity coupled biomass chemical chain directional gasification system for producing natural gas and methanol, in which the green electricity generated by wind power generation or photovoltaic power generation is used in a water electrolysis module, a biomass chemical chain gasification module, a synthetic methanol module and a synthetic natural gas module, and the oxygen produced as a byproduct of hydrogen production by water electrolysis is used for biomass chemical chain gasification, thereby realizing efficient consumption of green electricity and quality improvement of biomass; and the hydrogen generated by water electrolysis and the oxidizing gas produced in the biomass chemical chain gasification process are further used for synthesizing methanol, and the gasification gas produced in the biomass chemical chain gasification process is further used for synthesizing natural gas, thereby improving the energy utilization efficiency of the system and further realizing efficient consumption of green electricity and quality improvement of biomass. Therefore, through the system action of green electricity and chemical chain gasification, not only the consumption efficiency of green electricity is greatly improved, efficient quality improvement of biomass is realized, but also the energy utilization efficiency of the system is improved;

[0018] 2. The green electricity coupled biomass chemical chain directional gasification system for producing natural gas and methanol of the present invention provides a clean and efficient way of energy utilization, promotes the coordinated development of new energy and biomass resources; and provides strong technical support for green electricity consumption, biomass quality improvement and utilization, and long-term energy storage participating in grid auxiliary services. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a green electricity coupled biomass chemical chain directional gasification system for producing natural gas and methanol provided by the present invention;

[0020] The names of the corresponding marks in the accompanying drawings are:

[0021] New energy green electricity module 1, water electrolysis module 2, electrolyzer 21, heater 22, biomass chemical chain gasification module 3, biomass silo 31, chemical chain gasification reactor 32, air reactor 33, synthetic methanol module 4, gas compressor 41, water tank 42, methanol synthesis reactor 43, methanol distillation device 44, methanol storage tank 45, synthetic natural gas module 5, methanation reactor 51, natural gas storage tank 52, power grid 6. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0023] like Figure 1As shown, a green electricity coupled biomass chemical chain directional gasification system for producing natural gas and methanol includes a new energy green electricity module 1, a water electrolysis module 2, a biomass chemical chain gasification module 3, a synthetic methanol module 4, a synthetic natural gas module 5 and a power grid 6. The distributed green electricity module 1 is connected to the water electrolysis module 2, the biomass chemical chain gasification module 3, the synthetic methanol module 4, the synthetic natural gas module 5 and the power grid 6 respectively. The new energy green electricity module 1 includes a wind power generation system or a photovoltaic power generation system, which are all connected to the power grid 6, and are also connected to the water electrolysis module 2, the biomass chemical chain gasification module 3, the synthetic methanol module 4 and the synthetic natural gas module 5 to supply power to them. When there is over-generation of new energy, the consumption of new energy electricity is started; wherein, the water electrolysis module 2 includes a proton exchange membrane electrolyzer 21 and a heater 22; the biomass chemical chain gasification module 3 includes a biomass silo 31, a chemical chain gasification reactor 32 and an air reactor 33; the synthetic methanol module 4 includes a gas compressor 41, a water tank 42, a methanol synthesis reactor 43, a methanol distillation device 44 and a methanol storage tank 45; the synthetic natural gas module 5 includes a methanation reactor 51 and a natural gas storage tank 52.

[0024] The water electrolysis module 2 includes a proton exchange membrane electrolyzer 21 and a heater 22, the outlet of the heater 22 is connected to the inlet of the proton exchange membrane electrolyzer 21, and the heater 22 dynamically adjusts the water supply temperature of the synthetic methanol module to control its outlet temperature at 80°C-90°C, such as 80°C, 85°C, etc.; wherein the electrolyzer 21 includes a hydrogen outlet and an oxygen outlet, the hydrogen outlet is connected to the inlet of the gas compressor 41, and the oxygen outlet is connected to the inlet of the air reactor 33;

[0025] The biomass chemical chain gasification module 3 includes a biomass silo 31, a chemical chain gasification reactor 32 and an air reactor 33; the outlet of the biomass silo 31 is connected to the inlet of the chemical chain gasification reactor 32; after crushing and screening, the biomass is fully mixed with the CaO / Fe2O3 in the chemical chain gasification reactor 32 to achieve a catalytic gasification reaction; by adjusting the CaO / Fe2O3 ratio and the ratio of water to biomass fuel, the chemical chain gasification reactor 32 is controlled to adapt to different types of biomass to achieve directional gasification to generate gasified gas with H2:CO≥3:1; the solid residue outlet of the chemical chain gasification reactor 32 is connected to the inlet of the air reactor 33, and the gasification gas outlet is connected to the inlet of the methanation reactor 51; the fixed residue in the air reactor 33 is fully burned with oxygen to generate CO2-rich oxidized gas and re-oxidized CaO / Fe2O3; the CaO / Fe2O3 outlet of the air reactor 33 is connected to the inlet of the chemical chain gasification reactor 32, and the oxidized gas outlet is connected to the inlet of the gas compressor 41;

[0026] The synthetic methanol module 4 includes a gas compressor 41, a water tank 42, a methanol synthesis reactor 43, a methanol distillation device 44 and a methanol storage tank 45. The inlet of the gas compressor 41 is respectively connected to the outlet of the proton exchange membrane electrolyzer 21 and the oxidizing gas outlet of the air reactor 33, and the outlet of the gas compressor 41 is sequentially connected to the methanol synthesis reactor 43, the methanol distillation device 44 and the methanol storage tank 45; the water in the water tank 42 flows in two ways, one of which passes through the cooling pipe of the methanol synthesis reactor 43 and is connected to the inlet of the proton exchange membrane electrolyzer 21; the other is connected to the inlet of the chemical chain gasification reactor 32;

[0027] The synthetic natural gas module 5 includes a methanation reactor 51 and a natural gas storage tank 52 . The inlet of the methanation reactor 51 is connected to the gasification gas outlet of the chemical chaining gasification reactor 32 , and the outlet of the methanation reactor 51 is connected to the inlet of the natural gas storage tank 52 .

[0028] Specifically, the new energy green electricity module 1 provides the required electric energy for the water electrolysis module 2, the biomass chemical chain gasification module 3, the synthetic methanol module 4 and the synthetic natural gas module 5; the water in the water tank 42 is divided into two paths, the first water flow flows to the cooling pipe of the methanol synthesis reactor 43, and then flows to the heater 22 from the outlet of the cooling pipe of the methanol synthesis reactor 43, the heater 22 heats the water and then flows into the proton exchange membrane electrolyzer 21 for electrolysis, the hydrogen generated by the electrolysis of the proton exchange membrane electrolyzer 21 flows into the gas compressor 41, the oxygen generated by the electrolysis of the proton exchange membrane electrolyzer 21 flows into the air reactor 33 to generate oxidizing gas, the oxidizing gas is mixed with the hydrogen flowing out of the proton exchange membrane electrolyzer 21, passes through the gas compressor 41, is compressed, and finally flows into the methanol synthesis reactor 43 from the outlet of the gas compressor 41 to generate methanol, which is stored in the methanol storage tank 45; the second water flow flows to the chemical chain gasification reactor 32 to generate gasified gas, the gasified gas flows to the methanation reactor 51 to generate natural gas, and is stored in the natural gas storage tank 52.

[0029] In summary, the present invention is a green electricity coupled biomass chemical chain directional gasification system for producing natural gas and methanol, which uses the green electricity generated by wind power generation or photovoltaic power generation for water electrolysis module 2, biomass chemical chain gasification module 3, synthetic methanol module 4 and synthetic natural gas module 5, and the oxygen produced as a by-product of water electrolysis to produce hydrogen is used for biomass chemical chain gasification, thereby achieving efficient consumption of green electricity and quality improvement of biomass; and the hydrogen generated by water electrolysis and the oxidizing gas produced in the biomass chemical chain gasification process are further used to synthesize methanol, and the gasification gas produced in the biomass chemical chain gasification process is further used to synthesize natural gas, thereby improving the energy utilization efficiency of the system, and further achieving efficient consumption of green electricity and quality improvement of biomass. Therefore, through the system action of green electricity and chemical chain gasification, not only the consumption efficiency of green electricity is greatly improved, efficient quality improvement of biomass is achieved, but also the energy utilization efficiency of the system is improved.

[0030] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the technical solution of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A green electricity coupled biomass chemical chain directional gasification system for producing natural gas and methanol, comprising a new energy green electricity module (1), a water electrolysis module (2), a biomass chemical chain gasification module (3), a synthetic methanol module (4) and a synthetic natural gas module (5), wherein the new energy green electricity module (1) is connected to the water electrolysis module (2), the biomass chemical chain gasification module (3), the synthetic methanol module (4) and the synthetic natural gas module (5) respectively; the new energy green electricity module (1) comprises a wind power generation system or a photovoltaic power generation system; the water electrolysis module (2) comprises a hydrogen outlet and an oxygen outlet, wherein the hydrogen outlet is connected to the synthetic methanol module (4); the oxygen outlet is connected to the biomass chemical chain gasification module (3); the biomass chemical chain gasification module (3) comprises a gasification gas outlet and an oxidation gas outlet, wherein the gasification gas outlet is connected to the synthetic natural gas module (5), and the oxidation gas outlet is connected to the synthetic methanol module (4); the synthetic methanol module (4) comprises a water outlet, wherein the water outlet is respectively connected to the water electrolysis module (2) and the biomass chemical chain gasification module (3).

2. The green electricity coupled biomass chemical chain directional gasification system for producing natural gas and methanol according to claim 1 is characterized by: The water electrolysis module (2) comprises a proton exchange membrane electrolyzer (21) and a heater (22); the inlet of the heater (22) is connected to the synthetic methanol module (4), and the outlet of the heater (22) is connected to the proton exchange membrane electrolyzer (21); the heater (22) dynamically adjusts the water supply temperature of the synthetic methanol module (4) so ​​that the outlet temperature is controlled at 80°C-90°C.

3. The green electricity coupled biomass chemical chain directional gasification system for producing natural gas and methanol according to claim 1 is characterized in that: The biomass chemical chain gasification module (3) comprises a biomass silo (31), a chemical chain gasification reactor (32) and an air reactor (33); the biomass silo (31) is connected to the chemical chain gasification reactor (32); after being crushed and screened, the biomass is fully mixed with the CaO / Fe2O3 in the chemical chain gasification reactor (32) to achieve a catalytic gasification reaction; by adjusting the CaO / Fe2O3 ratio and the ratio of water to biomass fuel, the chemical chain gasification reactor (32) is controlled to adapt to different types of biomass to achieve directional gasification to generate gasified gas with a ratio of H2:CO≥3:1; the solid residue outlet of the chemical chain gasification reactor (32) is connected to the air reactor (33), and the gasified gas outlet is connected to the synthetic natural gas module (5).

4. The green electricity coupled biomass chemical chain directional gasification system for producing natural gas and methanol according to claim 3 is characterized in that: The fixed residue in the air reactor (33) is fully burned with oxygen to generate an oxidizing gas rich in CO2 and re-oxidized CaO / Fe2O3; the CaO / Fe2O3 outlet of the air reactor (33) is connected to the chemical chain gasification reactor (32), and the oxidizing gas outlet is connected to the synthetic methanol module (4).

5. The green electricity coupled biomass chemical chain directional gasification system for producing natural gas and methanol according to claim 1 is characterized in that: The synthetic methanol module (4) comprises a gas compressor (41), a water tank (42), a methanol synthesis reactor (43), a methanol distillation device (44) and a methanol storage tank (45); the inlet of the gas compressor (41) is respectively connected to the hydrogen outlet of the water electrolysis module (2) and the oxidation gas outlet of the biomass chemical chain module (3), and the outlet of the gas compressor (41) is sequentially connected to the methanol synthesis reactor (43), the methanol distillation device (44) and the methanol storage tank (45); the water in the water tank (42) flows in two ways, one of which is input into the water electrolysis module (2) through the cooling pipe of the methanol synthesis reactor (43); and the other is connected to the biomass chemical chain module (3).

6. The green electricity coupled biomass chemical chain directional gasification system for producing natural gas and methanol according to claim 1, characterized in that: The synthetic natural gas module (5) comprises a methanation reactor (51) and a natural gas storage tank (52), wherein the inlet of the methanation reactor (51) is connected to the biomass gasification module (3), and the outlet of the methanation reactor (51) is connected to the natural gas storage tank (52).

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