Biomass pyrolysis system

Abstract

The utility model provides a biomass pyrolysis system, which relates to the technical field of biomass pyrolysis and comprises a photovoltaic module. The heat storage module is electrically connected with the photovoltaic module and stores heat by using the electric power of the photovoltaic module; a cracking furnace; the heat exchange module and the electric heating module are both used for heating the cracking furnace; the first heat exchanger is used for utilizing heat of the synthesis gas pipeline. Clean energy of the photovoltaic module is utilized, the cracking furnace is heated, the energy utilization rate is increased, needed fuel is reduced through the dual effects of fused salt heat exchange and electric heating, waste heat of high-temperature synthesis gas is utilized through the heat exchanger, the synthesis gas is changed into low-temperature synthesis gas, energy needed in the cooling process is reduced, and cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of biomass pyrolysis technology, and in particular to a high-temperature biomass pyrolysis system. Background Technology

[0002] Biomass produces syngas after combustion, and the syngas is used to synthesize methanol in a reactor. Currently, biomass is produced by high-temperature combustion in boilers or rotary kilns, which consumes a large amount of fuel and is not conducive to true energy conservation. Furthermore, the syngas needs to be cooled before it can be synthesized into methanol, which requires additional energy and increases costs. In response to the above-mentioned shortcomings, this application is proposed. Utility Model Content

[0003] The purpose of this invention is to provide a high-temperature biomass pyrolysis system that solves the current problems of high costs caused by the large amount of fuel required to produce syngas from biomass and the additional energy required to cool the syngas.

[0004] To address the aforementioned problems, this utility model provides a biomass high-temperature pyrolysis system, including a photovoltaic module for generating electricity;

[0005] Thermal storage module: The thermal storage module is electrically connected to the photovoltaic module and uses the electricity generated by the photovoltaic module for thermal storage;

[0006] Cracking furnace: The pyrolysis furnace is equipped with a feed inlet, a gas outlet and a slag discharge outlet. The pyrolysis furnace is used for high-temperature pyrolysis of biomass. The feed inlet is used to feed biomass raw materials, the slag discharge outlet is used to discharge ash and slag, and the gas outlet is connected to a syngas pipeline.

[0007] Heat exchange module and electric heating module: Both the heat exchange module and the electric heating module are used to heat the cracking furnace. The heat exchange module has heat exchange with the heat storage module. The electric heating module is electrically connected to the photovoltaic module and is also connected to the mains power.

[0008] First heat exchanger: The first heat exchanger is used to utilize the heat from the syngas pipeline. There is heat exchange between the first heat exchanger and the heat exchange module. The heat from the syngas pipeline is used to assist the heat exchange module in heating up, thereby achieving the purpose of saving energy.

[0009] According to one embodiment of the present invention, the biomass high-temperature pyrolysis system further includes a second heat exchanger and an air supply module. The second heat exchanger can use the heat from the syngas pipeline to assist in heating the gas in the air supply module, and the gas in the air supply module is used for drying the biomass.

[0010] Optionally, the air supply module is connected to the biomass storage tank or the biomass input pipeline, and the biomass input pipeline is connected to the feed inlet.

[0011] According to one embodiment of the present invention, the first heat exchanger and the second heat exchanger are arranged sequentially in the gas flow direction of the syngas pipeline, and are used to realize the utilization of high-temperature waste heat and low-temperature waste heat, respectively.

[0012] According to one embodiment of the present invention, the heat storage module includes a molten salt heat storage system, and optionally a solid heat storage system.

[0013] According to one embodiment of the present invention, the heat exchange module and the electric heating module are arranged in several groups and evenly distributed on the pyrolysis furnace.

[0014] According to one embodiment of the present invention, the pyrolysis furnace has a cylindrical structure, and the heat exchange module and the electric heating module are alternately distributed on the outer circumference of the pyrolysis furnace.

[0015] According to one embodiment of the present invention, the pyrolysis furnace has an insulation layer to reduce heat loss.

[0016] According to one embodiment of the present invention, the heat exchange module includes an inlet pipe and an outlet pipe, and the first heat exchanger and the outlet pipe have heat exchange.

[0017] The beneficial effects of this invention are that it utilizes the clean energy of photovoltaic modules to heat the pyrolysis furnace through the dual effects of molten salt heat exchange and electric heating, thereby improving energy utilization efficiency, reducing fuel requirements, and utilizing the waste heat of high-temperature syngas through the heat exchanger to assist in the heating of the heat exchange module, achieving the goal of energy saving. High-temperature air is also obtained, which can be used for drying biomass. After drying, the pyrolysis efficiency of the biomass entering the pyrolysis furnace can be improved through secondary heat exchange. Through multiple heat exchanges, the syngas is transformed into low-temperature syngas, with a temperature slightly higher than that required for methanol synthesis, reducing the energy required for the cooling process and further reducing costs. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the overall biomass high-temperature pyrolysis system;

[0020] Figure 2 This is a schematic diagram of the pyrolysis furnace, the first heat exchanger, and the second heat exchanger.

[0021] Figure 3 This is a schematic diagram of the pyrolysis furnace.

[0022] Figure 4 This is the front view of the pyrolysis furnace. Detailed Implementation

[0023] The following description is only intended to disclose the present invention so that those skilled in the art can implement it. The embodiments in the following description are merely examples, and those skilled in the art will conceive of other obvious modifications. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other solutions that do not depart from the spirit and scope of the present invention.

[0024] Example 1:

[0025] A biomass high-temperature pyrolysis system, such as Figure 1 It includes a photovoltaic module 5, a thermal storage module 3, a pyrolysis furnace 7, a heat exchange module 2, an electric heating module 1, a first heat exchanger 9, and a second heat exchanger 11.

[0026] Photovoltaic module 5 includes photovoltaic panels and inverter 6, which are used to generate electricity.

[0027] The thermal storage module 3 may include a molten salt thermal storage system or a solid thermal storage system. In this embodiment, a molten salt thermal storage system is used, which includes a molten salt tank and an electric heater 4. The photovoltaic module 5 provides power to the electric heater 4 and uses the power of the photovoltaic module 5 for thermal storage.

[0028] like Figure 3 The pyrolysis furnace 7 has a cylindrical structure with an insulation layer to reduce heat loss. The two ends of the pyrolysis furnace 7 are respectively provided with a feed port 71 and a slag discharge port 73, and a gas outlet 72 is provided near the feed port 71. The pyrolysis furnace 7 is used for high-temperature pyrolysis of biomass. The feed port 71 is used to feed biomass raw materials, the slag discharge port 73 is used to discharge ash and slag, and the gas outlet 72 is connected to a syngas pipeline 74.

[0029] Both heat exchange module 2 and electric heating module 1 are used to heat the pyrolysis furnace 7. They can be installed inside or outside the insulation layer, or in the same layer. Heat exchange module 2 and heat storage module 3 exchange heat. Heat exchange module 2 uses a heat exchanger from the prior art, such as... Figure 1 The heat exchange module 2 exchanges heat with the heat storage module 3 through the liquid inlet pipe 21 and the liquid outlet pipe 22. The electric heating module 1 is electrically connected to the photovoltaic module 5 and is also connected to the mains power. The heat exchange module 2 and the electric heating module 1 are alternately distributed on the outer circumference of the cracking furnace 7.

[0030] The synthesis gas generated by the cracking furnace is carbon monoxide, carbon dioxide, hydrogen, etc., which requires a high temperature of about 1000 degrees Celsius. However, the temperature for synthesizing methanol from carbon monoxide, carbon dioxide, hydrogen, etc. is about 300 degrees Celsius. Therefore, the high-temperature gas needs to be cooled down before the next synthesis process can be carried out. In order to make full use of the thermal energy of the high-temperature gas, the gas enters the heat exchange module at the outlet of the high-temperature cracking furnace to heat the heat exchange medium.

[0031] like Figure 2 The first heat exchanger 9 and the second heat exchanger 11 are arranged sequentially in the gas flow direction of the syngas pipeline 74, and are used to utilize high-temperature waste heat and low-temperature waste heat respectively.

[0032] The first heat exchanger 9 and the heat exchange module 2 have heat exchange between them. It is located at the liquid outlet pipe 22 and uses the heat from the synthesis gas pipeline 74 to assist the heat exchange module 2 in heating up, thereby saving energy.

[0033] The second heat exchanger 11 can use the heat from the syngas pipeline 74 to assist in heating the gas in the air supply module 10. The second heat exchanger 11 is installed in the pipeline section of the air supply module 10, and the gas in the air supply module 10 is used for drying biomass.

[0034] Optionally, the air supply module 10 is connected to a biomass storage tank or a biomass input pipeline, and the biomass input pipeline is connected to the feed inlet 71.

[0035] High-temperature syngas at 1000 degrees Celsius enters the first heat exchanger 9 through the outlet of the pyrolysis furnace, heating the furnace. The gas exiting the first heat exchanger 9 is medium-temperature syngas. Passing through the first heat exchanger 9, the liquid outlet pipe 22 of the heat exchange module receives heat, increasing the temperature of the low-temperature medium inside the pipe and reducing the amount of heating required in the molten salt tank. After passing through the second heat exchanger 11, the medium-temperature syngas heats the air flowing through it, transforming it into high-temperature air. This high-temperature air is used for drying the biomass, improving its pyrolysis efficiency after entering the pyrolysis furnace. The medium-temperature syngas then becomes low-temperature syngas, with a temperature slightly higher than that required for methanol synthesis. This waste heat utilization process fully utilizes the reaction heat from the high-temperature pyrolysis furnace while simultaneously obtaining free high-temperature drying air.

[0036] The pyrolysis furnace 7 is heated by a combination of molten salt heat exchange and electric heating; biomass enters the pyrolysis furnace through the feed inlet, and the syngas generated by the pyrolysis in the furnace is discharged through the outlet.

[0037] When the photovoltaic panel has sufficient power, the electric heating module 1 heats the pyrolysis furnace, and the excess power is used to heat the molten salt, with the heat stored in the molten salt tank. When the photovoltaic panel has insufficient power, the pyrolysis furnace is heated by heat exchange module 2 through molten salt heat exchange; or municipal power is used to heat the boiler.

[0038] Example 2:

[0039] Based on Example 1, in this example, the electric heater 4 can also be connected to the mains power supply to store heat during off-peak hours, thereby reducing costs.

[0040] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations and modifications.

Claims

1. A biomass pyrolysis system, characterized by: The photovoltaic module (5) is used for generating electricity; The heat storage module (3) is electrically connected with the photovoltaic module (5) and is used for storing heat by using the electricity of the photovoltaic module (5); The pyrolysis furnace (7) is provided with a feeding port (71), an air outlet (72) and a slag discharge port (73), and is used for high-temperature pyrolysis of biomass, and the air outlet (72) is connected with a synthesis gas pipeline (74); The heat exchange module (2) and the electric heating module (1) are both used for heating the pyrolysis furnace (7), the heat exchange module (2) is in heat exchange with the heat storage module (3), and the electric heating module (1) is electrically connected with the photovoltaic module (5); The first heat exchanger (9) is used for utilizing the heat of the synthesis gas pipeline (74), the first heat exchanger (9) is in heat exchange with the heat exchange module (2), and the heat of the synthesis gas pipeline (74) is used to assist the temperature rise of the heat exchange module (2).

2. The biomass fast pyrolysis system of claim 1, wherein: The biomass high-temperature pyrolysis system further comprises a second heat exchanger (11) and an air supply module (10), the second heat exchanger (11) can utilize the heat of the synthesis gas pipeline (74) to assist the temperature rise of the gas in the air supply module (10), and the gas in the air supply module (10) is used for drying the biomass.

3. The biomass fast pyrolysis system of claim 2, wherein: The first heat exchanger (9) and the second heat exchanger (11) are sequentially arranged in the gas flow direction of the synthesis gas pipeline (74).

4. The biomass pyrolysis system of claim 1, wherein: The heat storage module (3) comprises a molten salt heat storage system.

5. The biomass fast pyrolysis system according to claim 1, wherein: The heat exchange module (2) and the electric heating module (1) are arranged in several groups and are uniformly distributed and installed on the pyrolysis furnace (7).

6. The biomass fast pyrolysis system according to claim 5, wherein: The pyrolysis furnace (7) is a cylindrical structure, and the heat exchange module (2) and the electric heating module (1) are alternately arranged and distributed on the outer circumferential surface of the pyrolysis furnace (7).

7. The biomass pyrolysis system according to any one of claims 1-6, wherein: The pyrolysis furnace (7) has a heat preservation layer.

8. The biomass fast pyrolysis system according to claim 1, wherein: The heat exchange module (2) comprises an inlet pipe (21) and an outlet pipe (22), and the first heat exchanger (9) is in heat exchange with the outlet pipe (22).

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