Distributed green electricity coupled biomass upgrading collaborative system

Abstract

The invention belongs to the technical field of rural distributed new energy power generation and comprehensive utilization of agriculture and forestry residues, and discloses a distributed green electricity coupled biomass upgrading collaborative system which comprises a new energy green electricity module, a proton exchange membrane water electrolysis module, a biomass gasification module and a synthetic natural gas module. The new energy green electricity module is respectively connected with the proton exchange membrane electrolyzed water module, the biomass gasification module and the synthetic natural gas module; the new energy green power module comprises a wind power generation system or a photovoltaic power generation system; the proton exchange membrane electrolyzed water module comprises a hydrogen outlet and an oxygen outlet, the hydrogen outlet is connected with the synthetic natural gas module, and the oxygen outlet is connected with the biomass gasification module; the biomass gasification module comprises a water outlet and a gasified gas outlet, the water outlet is connected with the proton exchange membrane electrolyzed water module, and the gasified gas outlet is connected with the synthetic natural gas module; the problems of low efficiency and resource waste in the current new energy power generation and biomass utilization process are solved.

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 synergistic system of distributed green electricity coupled with biomass quality improvement. Background Art

[0002] As the global carbon neutrality goal is advanced, the energy structure is gradually shifting from reliance on fossil energy to new energy. With the rapid development of new energy sources such as photovoltaic and wind power, the construction of a new power system with new energy as the main body has become an important support for the construction of a modern energy system.

[0003] However, when electricity load is at low levels, the consumption of new energy electricity faces pressure. This situation is also called "over-generation of new energy" or "power surplus". This power surplus may bring about a series of negative consequences, such as affecting the stable operation of the power grid and causing waste of resources.

[0004] At the same time, biomass, as an important new energy source, has great potential in replacing fossil energy due to its abundant resources and carbon neutrality. Traditional biomass gasification technology mainly converts biomass into combustible gas through high-temperature cracking and partial oxidation, but the gas composition produced during the gasification process is complex and direct use is difficult. Summary of the invention

[0005] The present invention aims to provide a synergistic system of distributed green electricity coupled with biomass quality improvement, which uses the green electricity generated by wind power generation or photovoltaic power generation to produce hydrogen by proton exchange membrane water electrolysis, and uses the oxygen produced in the hydrogen production process for biomass gasification, thereby achieving efficient consumption of green electricity and quality improvement of biomass, and solving the problems of inefficiency and waste of resources in the current new energy power generation and biomass utilization process.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A distributed green electricity coupled biomass quality improvement synergistic system, comprising a new energy green electricity module, a proton exchange membrane water electrolysis module, a biomass gasification module and a synthetic natural gas module, wherein the new energy green electricity module is connected to the proton exchange membrane water electrolysis module, the biomass gasification module and the synthetic natural gas module respectively;

[0008] The new energy green electricity module includes a wind power generation system or a photovoltaic power generation system;

[0009] The proton exchange membrane water electrolysis module comprises a hydrogen outlet and an oxygen outlet, the hydrogen outlet is connected to the synthetic natural gas module, and the oxygen outlet is connected to the biomass gasification module;

[0010] The biomass gasification module comprises a water outlet and a gasification gas outlet, wherein the water outlet is connected to the proton exchange membrane water electrolysis module, and the gasification gas outlet is connected to the synthetic natural gas module.

[0011] Furthermore, the proton exchange membrane water electrolysis module includes an electrolyzer, a heater and a first water pump, the inlet of the first water pump is connected to the biomass gasification module, the outlet of the first water pump is connected to the heater, and the outlet of the heater is connected to the electrolyzer.

[0012] Furthermore, the outlet temperature of the heater is controlled to be 80°C-90°C.

[0013] Furthermore, the biomass gasification module includes a water tank, a second water pump, a steam generator, a preheater, a bubbling fluidized bed reactor, a cyclone separator and a purification system connected in sequence, and the outlet of the purification system is connected to the synthetic natural gas module; the bubbling fluidized bed reactor is connected to a screw feeder.

[0014] Furthermore, the outlet water vapor temperature of the steam generator is controlled to be 100°C-110°C; the outlet gas temperature of the preheater is controlled to be 200-300°C; the bubbling fluidized bed reactor is provided with at least one auxiliary electric furnace, which is used for system startup and stable reaction of biomass gasification, and the outlet flue gas temperature of the bubbling fluidized bed reactor is controlled to be 900°C-1100°C.

[0015] Furthermore, the screw feeder is provided with a silo and a discharge port, the discharge port is communicated with the inlet of the bubbling fluidized bed reactor, and the screw feeder is provided with a cooling water jacket, and the cooling water jacket is used to cool the feed to avoid tempering.

[0016] Furthermore, a plurality of temperature sensors are provided inside the bubbling fluidized bed reactor, and the temperature sensors are used to monitor the reaction temperature in the dense phase region and the dilute phase region.

[0017] Furthermore, the purification system includes a condensing device, an SCR denitrification device, a bag dust removal device and a desulfurization device which are connected in sequence.

[0018] 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.

[0019] Furthermore, the gas temperature in the methanation reactor is controlled to be 250-350°C.

[0020] The beneficial effects of the technical solution are:

[0021] 1. The present invention provides a synergistic system for the quality improvement of biomass coupled with distributed green electricity, which uses the green electricity generated by wind power generation or photovoltaic power generation in the proton exchange membrane water electrolysis module, the biomass gasification module and the synthetic natural gas module, and the oxygen produced as a byproduct of hydrogen production by proton exchange membrane water electrolysis is used for biomass gasification, thereby achieving efficient consumption of green electricity and quality improvement of biomass; and the hydrogen generated by proton exchange membrane water electrolysis and the gasification gas produced in the gasification process are further used for synthetic natural gas, thereby improving the energy efficiency of the system, and further achieving efficient consumption of green electricity and quality improvement of biomass. Therefore, through the synergistic effect of green electricity and biomass gasification, not only the consumption efficiency of green electricity is greatly improved, efficient quality improvement of biomass is achieved, but also the energy efficiency of the system is improved;

[0022] 2. The distributed green electricity coupled biomass quality improvement collaborative system 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

[0023] Figure 1 A schematic diagram of a synergistic system for distributed green electricity coupled with biomass quality improvement according to the present invention;

[0024] The names of the corresponding marks in the accompanying drawings are:

[0025] New energy green electricity module 1, proton exchange membrane water electrolysis module 2, electrolyzer 21, heater 22, first water pump 23, biomass gasification module 3, water tank 31, second water pump 32, steam generator 33, preheater 34, bubbling fluidized bed reactor 35, screw feeder 36, temperature sensor 37, cyclone separator 38, purification system 39, synthetic natural gas module 4, methanation reactor 41, natural gas storage tank 42, power grid 5. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0027] like Figure 1As shown, a distributed green electricity coupled biomass quality improvement collaborative system includes a new energy green electricity module 1, a proton exchange membrane water electrolysis module 2, a biomass gasification module 3 and a synthetic natural gas module 4. The new energy green electricity module 1 is connected to the proton exchange membrane water electrolysis module 2, the biomass gasification module 3 and the synthetic natural gas module 4 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 5, and are also connected to the proton exchange membrane water electrolysis module 2, the biomass gasification module 3 and the synthetic natural gas module 4 to supply power to them. When there is excess generation of new energy, the consumption of new energy electricity is started; wherein, the proton exchange membrane water electrolysis module 2 includes an electrolytic cell 21, a heater 22 and a first water pump 23; the biomass gasification module 3 includes a water tank 31, a second water pump 32, a steam generator 33, a preheater 34, a bubbling fluidized bed reactor 35, a cyclone separator 38, a purification system 39, a temperature sensor 37 and a screw feeder 36 connected in sequence; the synthetic natural gas module 4 includes a methanation reactor 41 and a natural gas storage tank 42.

[0028] The proton exchange membrane water electrolysis module 2 includes an electrolyzer 21, a heater 22 and a first water pump 23, the inlet of the first water pump 23 is connected to an outlet of the water tank 31 of the biomass gasification module 3, the outlet of the first water pump 23 is connected to the heater 22, the outlet of the heater 22 is connected to the electrolyzer 21, and the outlet temperature of the heater 22 is controlled to be 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 methanation reactor 41, and the oxygen outlet is connected to the inlet of the preheater 34;

[0029] The biomass gasification module 3 includes a water tank 31, a second water pump 32, a steam generator 33, a preheater 34, a bubbling fluidized bed reactor 35, a cyclone separator 38 and a purification system 39 which are connected in sequence. The outlet of the purification system 39 is a gasification gas outlet which is connected to the inlet of the methanation reactor 41. The purification system 39 includes a condensation device, an SCR denitrification device, a bag dust removal device and a desulfurization device, so that the purification system 39 can be combined according to the composition of the specific pollutants of the flue gas pollutants by setting the corresponding purification method. For example, the purification system 39 adopts a water condensation device + an SCR denitrification device + a bag dust removal device + a wet desulfurization device. Among them, the outlet water vapor temperature of the steam generator 33 is controlled to be 100℃-110℃, such as 100℃, 105℃, etc.; the outlet gas temperature of the preheater 34 is controlled to be 200-300℃, such as 250℃, 300℃, etc.; the bubbling fluidized bed reactor 35 is provided with at least one auxiliary electric furnace, which is used for the startup of the system and the stable reaction of biomass gasification, and the outlet flue gas temperature of the bubbling fluidized bed reactor 35 is controlled to be 900℃-1100℃, such as 900℃, 1000℃, etc. Three temperature sensors 37 are provided inside the bubbling fluidized bed reactor 35, and the temperature sensors 37 are used to monitor the reaction temperature of the dense phase zone and the dilute phase zone. The bubbling fluidized bed reactor 35 is connected to a screw feeder 36, and the screw feeder 36 is provided with a silo and a discharge port, and the discharge port is connected to the inlet of the bubbling fluidized bed reactor 35, and the screw feeder 36 is provided with a cooling water jacket, and the cooling water jacket is used to cool the feed to avoid tempering;

[0030] The synthetic natural gas module 4 includes a methanation reactor 41 and a natural gas storage tank 42. The outlet of the methanation reactor 41 is connected to the natural gas storage tank 42. The gas temperature in the methanation reactor 41 is controlled to be 250-350°C, such as 260°C, 300°C, etc.

[0031] Specifically, the new energy green electricity module 1 provides the required electric energy for the proton exchange membrane water electrolysis module 2, the biomass gasification module 3 and the synthetic natural gas module 4; the water in the water tank 31 is divided into two paths, the first water flow flows to the first water pump 23, and then flows into the heater 22 from the outlet of the first water pump 23, the heater 22 heats the water and then flows into the electrolyzer 21 for electrolysis, the hydrogen generated by the electrolysis of the electrolyzer 21 flows into the methanation reactor 41, and the oxygen generated by the electrolysis of the electrolyzer 21 flows into the preheater 34; the second water flow flows to the second water pump 32, and then flows into the steam generator 33 from the outlet of the second water pump 32, Water is converted into steam, and the steam and the oxygen flowing out of the electrolytic cell 21 flow into the preheater 34 for preheating, and then flow into the bubbling fluidized bed reactor 35 from the outlet of the preheater 34. At the same time, the screw feeder 36 transports the material into the bubbling fluidized bed reactor 35, and the material and oxygen react in the bubbling fluidized bed reactor 35 to generate gasified gas, which flows through the cyclone separator 38 and the purification system 39 for purification, and finally flows into the methanation reactor 41 from the outlet of the purification system 39, and reacts with the hydrogen flowing out of the electrolytic cell 21 to generate natural gas, which is stored in the natural gas storage tank 42.

[0032] In summary, the present invention is a synergistic system for the quality improvement of distributed green electricity coupled with biomass, which uses the green electricity generated by wind power generation or photovoltaic power generation for the proton exchange membrane water electrolysis module 2, the biomass gasification module 3 and the synthetic natural gas module 4, and the oxygen produced as a byproduct of hydrogen production by proton exchange membrane water electrolysis is used for biomass gasification, thereby achieving efficient consumption of green electricity and quality improvement of biomass; and the hydrogen generated by proton exchange membrane water electrolysis and the gasification gas produced during the gasification process are further used for synthetic 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 synergistic effect of green electricity and biomass gasification, not only the consumption efficiency of green electricity is greatly improved, the efficient quality improvement of biomass is achieved, but also the energy utilization efficiency of the system is improved.

[0033] 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 synergistic system for distributed green electricity coupled with biomass quality improvement, characterized in that: It comprises a new energy green electricity module (1), a proton exchange membrane water electrolysis module (2), a biomass gasification module (3) and a synthetic natural gas module (4), wherein the new energy green electricity module (1) is connected to the proton exchange membrane water electrolysis module (2), the biomass gasification module (3) and the synthetic natural gas module (4) respectively; The new energy green electricity module (1) comprises a wind power generation system or a photovoltaic power generation system; The proton exchange membrane water electrolysis module (2) comprises a hydrogen outlet and an oxygen outlet, the hydrogen outlet is connected to the synthetic natural gas module (4), and the oxygen outlet is connected to the biomass gasification module (3); The biomass gasification module (3) comprises a water outlet and a gasification gas outlet, the water outlet is connected to the proton exchange membrane water electrolysis module (2), and the gasification gas outlet is connected to the synthetic natural gas module (4).

2. A distributed green electricity coupled biomass quality improvement collaborative system according to claim 1, characterized in that: The proton exchange membrane water electrolysis module (2) comprises an electrolytic cell (21), a heater (22) and a first water pump (23), wherein the inlet of the first water pump (23) is connected to the biomass gasification module (3), the outlet of the first water pump (23) is connected to the heater (22), and the outlet of the heater (22) is connected to the electrolytic cell (21).

3. A distributed green electricity coupled biomass quality improvement collaborative system according to claim 2, characterized in that: The outlet temperature of the heater (22) is controlled to be 80°C-90°C.

4. A distributed green electricity coupled biomass quality improvement collaborative system according to claim 1, characterized in that: The biomass gasification module (3) comprises a water tank (31), a second water pump (32), a steam generator (33), a preheater (34), a bubbling fluidized bed reactor (35), a cyclone separator (38) and a purification system (39) which are connected in sequence, wherein the outlet of the purification system (39) is connected to the synthetic natural gas module (4); the bubbling fluidized bed reactor (35) is connected to a screw feeder (36).

5. A distributed green electricity coupled biomass quality improvement collaborative system according to claim 4, characterized in that: The outlet water vapor temperature of the steam generator (33) is controlled to be 100°C-110°C; the outlet gas temperature of the preheater (34) is controlled to be 200-300°C; the bubbling fluidized bed reactor (35) is provided with at least one auxiliary electric furnace, which is used for system startup and stable reaction of biomass gasification, and the outlet flue gas temperature of the bubbling fluidized bed reactor (35) is controlled to be 900°C-1100°C.

6. A distributed green electricity coupled biomass quality improvement collaborative system according to claim 4, characterized in that: The screw feeder (36) is provided with a silo and a discharge port, wherein the discharge port is communicated with the inlet of the bubbling fluidized bed reactor (35), and the screw feeder (36) is provided with a cooling water jacket, wherein the cooling water jacket is used to cool the feed to avoid tempering.

7. A distributed green electricity coupled biomass quality improvement synergistic system according to claim 4, characterized in that: A plurality of temperature sensors (37) are provided inside the bubbling fluidized bed reactor (35), and the temperature sensors (37) are used to monitor the reaction temperatures in the dense phase region and the dilute phase region.

8. A distributed green electricity coupled biomass quality improvement collaborative system according to claim 4, characterized in that: The purification system (39) comprises a condensing device, an SCR denitrification device, a bag dust removal device and a desulfurization device which are connected in sequence.

9. A distributed green electricity coupled biomass quality improvement collaborative system according to claim 4, characterized in that: The synthetic natural gas module (4) comprises a methanation reactor (41) and a natural gas storage tank (42), the inlet of the methanation reactor (41) is connected to the biomass gasification module (3), and the outlet of the methanation reactor (41) is connected to the natural gas storage tank (42).

10. A distributed green electricity coupled biomass quality improvement synergistic system according to claim 9, characterized in that: The gas temperature in the methanation reactor (41) is controlled to be 250-350°C.

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