Biomass biogas hydrogen production system with synchronous carbon capture

Abstract

The utility model relates to a carbon capture synchronous biomass biogas hydrogen production system, which belongs to the technical field of hydrogen production and comprises a decarburization tower A, a raw material heat exchanger, a reformer, a decarburization tower B and a condenser A, the decarburization tower A is used for decarburization treatment of biomass biogas; the raw material heat exchanger is used for preheating water vapor and biomass biogas treated by the decarbonization tower A; the reformer is used for reacting the water vapor transmitted by the raw material heat exchanger with the biomass biogas to obtain hydrogen-rich converted gas; the decarburization tower B is used for decarburization treatment of the hydrogen-rich converted gas subjected to heat exchange treatment by the raw material heat exchanger; and the condenser A is used for receiving the carbon-rich gas resolved by the decarbonization tower A and the decarbonization tower B. According to the carbon capture synchronous biomass biogas hydrogen production system, food-grade carbon dioxide is extracted while high-purity hydrogen is produced, equipment is safe, stable, durable and reliable, energy is saved, consumption is reduced, and the carbon capture synchronous biomass biogas hydrogen production system is matched with a small box type hydrogen production device.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen production technology, and in particular to a carbon capture and biomass biogas hydrogen production system. Background Technology

[0002] Chemical absorption is one of the most commonly used carbon capture methods in industry. Its principle involves the chemical reaction of amines with carbon dioxide-containing gases to produce carbonates or carbamates. The carbon dioxide is then released through heating and subsequently compressed for storage. The chemical absorption process includes decarbonization, absorption, regeneration, and compression drying, and it boasts advantages such as mature technology, wide application, and high capture efficiency.

[0003] However, chemical adsorption also has drawbacks such as high investment cost, large footprint, high energy consumption, and high equipment maintenance cost. It is not suitable for the removal of carbon dioxide in small box-type hydrogen production devices. Therefore, the inventors have proposed a new carbon capture and biomass biogas hydrogen production system for decarbonization of small and medium-sized biogas hydrogen production box-type devices. Utility Model Content

[0004] The purpose of this invention is to provide a carbon capture and biomass biogas hydrogen production system to meet the decarbonization requirements of small and medium-sized biogas hydrogen production box-type devices, and to provide a system with low operating costs, green environmental protection, high efficiency and reliability.

[0005] This utility model provides a carbon capture and simultaneous biomass biogas hydrogen production system, which adopts the following technical solution:

[0006] A carbon capture and biomass biogas hydrogen production system includes,

[0007] Decarbonization tower A is used for decarbonization treatment of biomass biogas.

[0008] A raw material heat exchanger is used to preheat steam and biogas processed by the decarbonization tower A;

[0009] A converter is used to react steam and biogas transferred from the feed heat exchanger to obtain hydrogen-rich converted gas.

[0010] Decarbonization tower B is used for decarbonization of hydrogen-rich conversion gas that has been heat-treated by the raw material heat exchanger.

[0011] Condenser A is used to receive the carbon-rich gas desorbed from decarbonization tower A and decarbonization tower B.

[0012] Preferably, it also includes an ice machine system for providing cooling capacity to condenser A.

[0013] Preferably, the material output end of the condenser A is connected to a purification tower.

[0014] Preferably, a carbon dioxide collection device is connected to the bottom end of the purification tower;

[0015] The top of the purification tower is used to discharge impurity gas.

[0016] Preferably, a condenser B is connected to the top of the purification tower.

[0017] Preferably, the converter is connected to an air source and a fuel gas source.

[0018] Preferably, the decarbonization tower B is connected to a hydrogen-rich product gas collection device.

[0019] In summary, this utility model has the following beneficial technical effects:

[0020] 1. In this utility model, the purified biomass biogas is decarbonized by decarbonization tower A. The carbon-rich gas released from decarbonization tower A flows into condenser A. The decarbonized biomass biogas and water vapor pass through a raw material heat exchanger and then enter the conversion furnace to react and produce hydrogen-rich conversion gas. The hydrogen-rich conversion gas is cooled by a heat exchanger and then enters decarbonization tower B for further decarbonization. The carbon-rich gas released from decarbonization tower B flows into condenser A. The carbon-rich gas released from decarbonization towers A and B is liquefied at low temperature in condenser A, thus achieving the simultaneous production of hydrogen and processing of carbon-rich gas. The scale of the pressure swing adsorption decarbonization and low-temperature liquefaction purification devices can be flexibly adjusted according to the hydrogen production scale of the small box-type hydrogen production device, and it has the characteristics of low energy consumption, good economic benefits, and low carbon emissions.

[0021] 2. The condenser A of this utility model is connected to a purification tower, and low-temperature liquefaction and purification are carried out in the purification tower to obtain food-grade carbon dioxide products.

[0022] 3. The purification tower of this utility model is connected to a condenser B at the top. When the gas comes out from the top of the purification tower, it will undergo throttling expansion when passing through the condenser B. Some components in the gas reach the dew point temperature and thus condense into liquid. The liquid will be reintroduced into the purification tower to improve the separation effect of the purification tower. Uncondensed impurity gas is discharged. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the process flow of a carbon capture and biomass biogas hydrogen production system provided in an embodiment of this utility model.

[0024] Explanation of reference numerals in the attached diagram: 1. Decarbonization tower A; 2. Raw material heat exchanger; 3. Conversion furnace; 31. Air source; 32. Fuel gas source; 4. Decarbonization tower B; 41. Hydrogen-rich product gas collection equipment; 5. Condenser A; 6. Purification tower; 61. Carbon dioxide collection equipment; 62. Condenser B; 7. Ice machine system. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1 The present invention will be described in further detail below.

[0026] This utility model provides a carbon capture and simultaneous biomass biogas hydrogen production system, referring to... Figure 1 The system includes a decarbonization tower A1, a raw material heat exchanger 2, a converter 3, a decarbonization tower B4, a condenser A5, and a purification tower 6. The decarbonization tower A1 decarbonizes the biomass biogas, the decarbonization tower B4 decarbonizes the hydrogen-rich product gas obtained from the reaction in the converter 3, and the condenser A5 receives the desorbed gas from the decarbonization towers A1 and B4. The carbon-rich gas desorbed from the decarbonization towers A1 and B4 flows into the condenser A5 and is then transported to the purification tower 6 for low-temperature condensation and purification.

[0027] Reference Figure 1 In this embodiment, the biomass biogas has a carbon content of 40-60%. After purification, the biomass biogas is decarbonized by decarbonization tower A1, mixed with water vapor, and preheated in raw material heat exchanger 2 before entering the converter 3 for reaction. The converter 3 is connected to an air source 31 and a fuel gas source 32, meaning that the heat required for the conversion process in the converter 3 is provided by the combustion of the combustion gas. The flue gas produced by the converter 3 can be subsequently recycled. The hydrogen-rich converted gas obtained by the converter 3 is cooled by the raw material heat exchanger 2 and then enters the decarbonization tower B4. The decarbonization tower B4 produces hydrogen-rich product gas and carbon-rich gas. The decarbonization tower B4 is connected to a hydrogen-rich product gas collection device 41, which is used to collect the hydrogen-rich product gas. The carbon-rich gas desorbed from the decarbonization towers A1 and B4 flows into the condenser A5.

[0028] Reference Figure 1 The condenser A5 is connected to an ice machine system 7, which provides cooling to the condenser A5. The purification tower 6 is connected to the material output end of the condenser A5. The carbon-rich gas processed by the condenser A5 is purified in the purification tower 6. In this embodiment, the bottom of the purification tower 6 yields a carbon dioxide product with a purity of 99.99%. The bottom of the purification tower 6 is connected to a carbon dioxide collection device 61.

[0029] Reference Figure 1 The top of the purification tower 6 is connected to a condenser B62. When the gas discharged from the top of the purification tower 6 passes through the condenser B62, it undergoes throttling expansion. Some components in the gas reach the dew point temperature and thus condense into liquid. The liquid is reintroduced into the purification tower to improve the separation effect of the purification tower. At the same time, the uncondensed impurity gas is discharged.

[0030] The implementation principle of this utility model's carbon capture and simultaneous biomass biogas hydrogen production system is as follows:

[0031] The purified biomass biogas is decarbonized in decarbonization tower A1. The carbon-rich gas released from decarbonization tower A1 flows into condenser A5. The decarbonized biomass biogas and water vapor then pass through raw material heat exchanger 2 and enter conversion furnace 3 to react and produce hydrogen-rich conversion gas. The hydrogen-rich conversion gas is cooled by a heat exchanger and then enters decarbonization tower B4 for further decarbonization. The carbon-rich gas released from decarbonization tower B4 flows into condenser A5. The carbon-rich gas released from decarbonization towers A1 and B4 is liquefied at low temperature in condenser A5. By employing two-stage pressure swing adsorption and low-temperature liquefaction purification technology, food-grade carbon dioxide can be extracted while producing high-purity hydrogen. The pressure swing adsorption decarbonization equipment is safe, stable, reliable, energy-saving, and suitable for small box-type hydrogen production units.

[0032] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A carbon capture and biomass biogas hydrogen production system, characterized in that, include, Decarbonization tower A (1) is used for decarbonization treatment of biomass biogas; Raw material heat exchanger (2) is used to preheat steam and biomass biogas processed by the decarbonization tower A (1); The converter (3) is used to react the steam and biogas transferred by the feedstock heat exchanger (2) to obtain hydrogen-rich converted gas; Decarbonization tower B (4) is used for decarbonization of hydrogen-rich conversion gas that has been heat-treated by the raw material heat exchanger (2); Condenser A (5) is used to receive the carbon-rich gas desorbed from the decarbonization tower A (1) and the decarbonization tower B (4).

2. The carbon capture and biomass biogas hydrogen production system according to claim 1, characterized in that, It also includes an ice machine system (7) for providing cooling to the condenser A (5).

3. The carbon capture and biomass biogas hydrogen production system according to claim 1, characterized in that, The material output end of the condenser A (5) is connected to a purification tower (6).

4. A carbon capture and biomass biogas hydrogen production system according to claim 3, characterized in that, The bottom end of the purification tower (6) is connected to a carbon dioxide collection device (61). The top of the purification tower (6) is used to discharge impurity gas.

5. A carbon capture and biomass biogas hydrogen production system according to claim 4, characterized in that... The top of the purification tower (6) is connected to a condenser B (62).

6. A carbon capture and biomass biogas hydrogen production system according to claim 1, characterized in that, The converter (3) is connected to an air source (31) and a fuel gas source (32).

7. A carbon capture and biomass biogas hydrogen production system according to claim 1, characterized in that, The decarbonization tower B (4) is connected to a hydrogen-rich product gas collection device (41).

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