Biomass synthesis gas pressurization separation system

Abstract

The utility model provides a biomass synthesis gas pressurization separation system, which relates to the technical field of biomass synthesis gas separation and comprises a synthesis gas supply module, a pressurization separation module and an energy utilization module, the synthesis gas supply module comprises a synthesis gas pipeline, and the pressurization separation module comprises at least three groups of gas compressors corresponding to liquefaction pressure of three gases. Liquefied gas is discharged through a liquid outlet pipe; the energy utilization module comprises a plurality of heat exchangers. Components in synthesis gas are fully separated in a pressurization separation mode, convenient conditions are provided for subsequent chemical reaction synthesis of alcohol substances, in the separation process, heat released in the gas compression process is fully utilized through heat absorption and heat release circulation by arranging an energy utilization module, compression energy consumption is reduced, energy is fully used, and the energy utilization efficiency is improved. The energy utilization rate is improved, and the synthesis gas pressurization separation cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of biomass syngas separation technology, and in particular to a biomass syngas pressurization and separation system. Background Technology

[0002] Biomass is burned to produce syngas, which is then used to synthesize methanol in a reactor. Syngas is a mixed gas, and membrane separation and adsorption methods are generally used to separate its components. However, these two methods cannot achieve complete separation; they only increase the relative content of a certain gas. The separated gas is difficult to use directly in subsequent chemical reactions to synthesize alcohols. Pressurized separation can achieve a more complete separation effect, but compression is an energy-intensive process, resulting in high costs. To address these shortcomings, this application is proposed. Utility Model Content

[0003] The purpose of this invention is to provide a biomass syngas pressurization and separation system that can achieve a more complete syngas separation effect, improve energy utilization, and reduce the cost of pressurization and separation.

[0004] To address the aforementioned problems, this utility model provides a biomass syngas pressurization and separation system, comprising a syngas supply module, a pressurization and separation module, and an energy utilization module. The syngas supply module includes a syngas pipeline through which syngas enters the pressurization and separation module. The pressurization and separation module includes at least three sets of gas compressors, corresponding to the liquefaction pressures of three gases. The three sets of gas compressors are connected to the syngas pipeline, and each set of gas compressors is connected to an outlet pipe through which liquefied gas is discharged. The energy utilization module includes several heat exchangers, which are divided into heat-absorbing and heat-releasing groups. The heat exchangers of the heat-absorbing group are distributed at the outlet of the gas compressors to absorb the heat released during gas compression. The heat exchangers of the heat-releasing group are located at the inlet of the first set of gas compressors. The heat exchangers of the heat-absorbing and heat-releasing groups are connected, and the heat exchangers of the heat-releasing group use the heat from the heat exchangers of the heat-absorbing group to heat the syngas. After heating, the temperature and pressure of the syngas will increase, which can reduce the subsequent compression pressure and reduce energy consumption.

[0005] According to one embodiment of the present invention, the pressurization and separation module further includes a circulation pipe, which connects the outlet of the last set of gas compressors and the inlet of the first set of gas compressors for recompressing excess gas.

[0006] According to one embodiment of the present invention, a first one-way valve is connected to the circulation pipeline to restrict the gas in the circulation pipeline to flow only in the direction from the outlet of the last set of gas compressors to the inlet of the first set of gas compressors, so as to prevent gas backflow.

[0007] According to one embodiment of the present invention, the heat exchanger of the heat absorption group is connected to the heat exchanger of the heat release group through a steam heat exchanger, a hot water heat exchanger and an absorption chiller unit connected in sequence.

[0008] According to one embodiment of the present invention, the number of heat exchangers in the heat absorption group is the same as the number of gas compressors. When three gas compressors are set, the number of heat exchangers in the heat absorption group is set to three.

[0009] According to one embodiment of the present invention, the synthesis gas pipeline is provided with a tortuous structure, and the liquid outlet pipe is located at the low point of the tortuous structure. The tortuous structure can be U-shaped or arc-shaped.

[0010] According to one embodiment of the present invention, the pressurization and separation module further includes a pressure gauge, which is configured in a one-to-one correspondence with the gas compressor. Preferably, a pressure gauge is also configured at the outlet of the syngas supply module.

[0011] According to one embodiment of the present invention, the syngas supply module further includes a syngas storage tank and a regulating valve. The syngas storage tank is connected to the regulating valve and the syngas pipeline. The syngas storage tank is connected to the biomass combustion device through an air inlet pipe. The regulating valve plays the role of regulating the air inlet flow rate and switching on / off.

[0012] According to one embodiment of the present invention, a second one-way valve is connected to the outlet of the syngas storage tank to prevent gas backflow.

[0013] The beneficial effects of this invention are that it fully separates the components in the syngas through pressurization separation, providing convenient conditions for subsequent chemical reactions to synthesize alcohols. Furthermore, during the separation process, by setting up an energy utilization module, the heat released during gas compression is fully utilized through endothermic and exothermic cycles, reducing compression energy consumption, making full use of energy, improving energy utilization efficiency, and thus reducing the cost of syngas pressurization separation. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a schematic diagram of the overall structure of a biomass syngas pressurization and separation system. Detailed Implementation

[0016] 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.

[0017] A biomass syngas pressurization and separation system, such as Figure 1 It includes a syngas supply module 1, a pressurization and separation module 2, and an energy utilization module 3.

[0018] Syngas supply module 1 includes a syngas storage tank 12, a regulating valve 13, a second check valve 62, and a syngas pipeline 14 connected in sequence. Syngas enters the pressurization and separation module 2 through the syngas pipeline 14. The syngas storage tank 12 is connected to the biomass combustion device through the air inlet pipe 11. The syngas storage tank 12 plays the role of stabilizing the flow rate and buffering the pressure. The regulating valve 13 plays the role of regulating the air inlet flow rate and switching on and off. The second check valve 62 is used to prevent gas backflow.

[0019] The pressurization and separation module 2 includes at least three sets of gas compressors, corresponding to the liquefaction pressure of three gases. The three sets of gas compressors are connected to the synthesis gas pipeline 14. The three sets of gas compressors are sequentially set as gas compressor one 21, gas compressor two 22 and gas compressor three 23. Gas compressor one 21, gas compressor two 22 and gas compressor three 23 are respectively connected to liquid outlet pipe one 41, liquid outlet pipe two 42 and liquid outlet pipe three 43.

[0020] The pressurization separation module 2 also includes a circulation pipe 24, which connects the outlet of the last gas compressor 23 and the inlet of the first gas compressor 21 for recompression of excess gas. A first check valve 61 is connected to the circulation pipe 24 to restrict the gas in the circulation pipe 24 to flow only from the outlet of the last gas compressor to the inlet of the first gas compressor, thus preventing gas backflow.

[0021] The pressurization and separation module 2 also includes a pressure gauge 5, which is set one-to-one with the gas compressor. A pressure gauge is also set at the outlet of the syngas supply module 1. The pressure gauge is used to monitor the syngas pressure and the pressurization pressure.

[0022] Carbon dioxide has a liquefaction temperature of -78.5℃ and a pressure of 6MPa. The liquefaction temperature of carbon monoxide is -199 degrees Celsius, and the pressure is 3.5 MPa. Hydrogen needs to be below -253 degrees Celsius and at a pressure (e.g., 10-15 MPa). Synthesis gas enters gas compressor 21 through synthesis gas pipeline 14 and is pressurized to a pressure of 3.5 MPa, at which point carbon monoxide liquefies, and liquid carbon monoxide flows out from outlet pipe 41. It then enters gas compressor 22 and is further pressurized to a pressure of 6 MPa, at which point carbon dioxide liquefies, and liquid carbon dioxide flows out from outlet pipe 42. Finally, it enters gas compressor 3 and is further pressurized to a pressure of 10-15 MPa, at which point hydrogen liquefies, and liquid hydrogen flows out from outlet pipe 43. The separated carbon monoxide, carbon dioxide, and hydrogen are then packaged into unidirectional volume storage tanks and stored separately, providing convenient conditions for subsequent chemical reactions to synthesize alcohols. When synthesis is needed, only the chemical ratio needs to be known, and the various gas storage tanks are extracted according to the ratio to carry out the chemical synthesis of alcohols, thus improving the efficiency of the alcohol reaction.

[0023] Preferably, the outlet positions of gas compressor 1 21, gas compressor 22 and gas compressor 3 23 are all provided with a tortuous structure, preferably a downward U-shaped bend, which can prevent liquid backflow and at the same time enhance the discharge of liquid gas, and the liquid outlet pipe is located at the U-shaped bend.

[0024] Energy utilization module 3 includes several heat exchangers, which are divided into heat absorption group and heat release group. The heat exchangers of the heat absorption group are distributed at the outlet of the gas compressor to absorb the heat released during gas compression. The heat exchangers of the heat release group are located at the inlet of the first gas compressor. The heat exchangers of the heat absorption group and the heat release group are connected. The heat exchangers of the heat release group use the heat from the heat exchangers of the heat absorption group to heat the synthesis gas. After heating, the temperature and pressure of the synthesis gas will increase, which can reduce the subsequent compression pressure and reduce energy consumption.

[0025] Specifically, the heat exchangers in the heat release group include heat exchanger 2 (32), heat exchanger 33 (33), and heat exchanger 4 (34), while the heat exchangers in the heat absorption group include heat exchanger 1 (31). Gas liquefaction releases a large amount of heat, and the heat exchangers in the heat release group are used to recover this heat. The low-temperature medium flows into the heat exchangers, while the high-temperature medium exits. The high-temperature medium can be used for heating or heat storage in other operating conditions. A steam heat exchanger (35), a hot water heat exchanger (36), and an absorption chiller unit are also connected between heat exchanger 1 (31) and heat exchanger 2 (32). The absorption chiller unit includes absorption chiller unit 1 (37) and absorption chiller unit 2 (38).

[0026] Since the liquefaction of gas under pressure releases heat, heat exchanger 22 is installed at the outlet of gas compressor 1 21, heat exchanger 33 is installed at the outlet of gas compressor 22, heat exchanger 4 34 is installed at the outlet of gas compressor 33, and heat exchanger 1 31 is installed at the inlet of gas compressor 1. The heat absorption sides of heat exchangers 1 31, 2 32, 3 33, and 4 34 are connected by pipes. The medium in the pipes flows from heat exchanger 1 31 to heat exchanger 4 34, fully absorbing the heat released during gas compression. The low-temperature medium flows from heat exchangers 2 32 and 3 33. Heat exchanger 4 (34) absorbs heat and flows out as a high-temperature medium. The high-temperature medium first passes through heat exchanger 1 (31) to heat the syngas. After heating, the temperature and pressure of the syngas will increase, which can reduce the subsequent compression pressure and reduce energy consumption. Then, the high-temperature medium flows into the steam heat exchanger to release heat and heat the cold water in the pipeline into steam. Then it flows into the hot water heat exchanger to heat the cold water in the pipeline into hot water. Then it flows into the absorption chiller unit, which absorbs waste heat and provides cooling capacity (refrigeration). The high-temperature medium becomes a low-temperature medium and flows back into heat exchanger 2 (32) for the next round of heat absorption and release cycle.

[0027] One cycle includes five exothermic processes: heat exchanger 1 (31), steam heat exchanger (35), hot water heat exchanger (36), absorption chiller unit 1 (37), and absorption chiller unit 2 (38); and three heating processes: heat exchanger 2 (32), heat exchanger 3 (33), and heat exchanger 4 (34). Through heat absorption and exothermic cycles, the heat released during gas compression is fully utilized, reducing compression energy consumption. It can provide energy in three forms: cooling, steam, and hot water, maximizing energy utilization and improving energy efficiency.

[0028] 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 syngas pressurization and separation system, characterized in that: The system includes a syngas supply module (1), a pressurization and separation module (2), and an energy utilization module (3). The syngas supply module (1) includes a syngas pipeline (14). The pressurization and separation module (2) includes at least three sets of gas compressors. The three sets of gas compressors are connected to the syngas pipeline (14), and each set of gas compressors is connected to an outlet pipe. The energy utilization module (3) includes several heat exchangers. The heat exchangers are divided into heat absorption groups and heat release groups. The heat exchangers of the heat absorption groups are distributed at the outlet of the gas compressors, and the heat exchangers of the heat release groups are located at the inlet of the first set of gas compressors. The heat exchangers of the heat absorption groups and the heat release groups are connected to each other.

2. The biomass syngas pressurization and separation system according to claim 1, characterized in that: The pressurization separation module (2) also includes a circulation pipe (24), which connects the outlet of the last set of gas compressors and the inlet of the first set of gas compressors.

3. The biomass syngas pressurization and separation system according to claim 2, characterized in that: A first check valve (61) is connected to the circulation pipe (24) to restrict the gas in the circulation pipe (24) to flow only from the outlet of the last set of gas compressors to the inlet of the first set of gas compressors.

4. The biomass syngas pressurization and separation system according to any one of claims 1-3, characterized in that: The heat exchangers of the heat absorption group are connected to the heat exchangers of the heat release group through a steam heat exchanger (35), a hot water heat exchanger (36), and an absorption chiller unit connected in sequence.

5. The biomass syngas pressurization and separation system according to claim 4, characterized in that: The number of heat exchangers in the heat absorption unit is the same as the number of gas compressors.

6. The biomass syngas pressurization and separation system according to any one of claims 1-3, characterized in that: The synthesis gas pipeline (14) is provided with a tortuous structure, and the liquid outlet pipe is located at the lower point of the tortuous structure.

7. The biomass syngas pressurization and separation system according to any one of claims 1-3, characterized in that: The pressurization separation module (2) also includes a pressure gauge (5), which is set one-to-one with the gas compressor.

8. The biomass syngas pressurization and separation system according to claim 4, characterized in that: The syngas supply module (1) also includes a syngas storage tank (12) and a regulating valve (13), wherein the syngas storage tank (12) is connected to the regulating valve (13) and the syngas pipeline (14).

9. The biomass syngas pressurization and separation system according to claim 8, characterized in that: A second check valve (62) is connected to the outlet of the syngas storage tank (12).

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