Zero-carbon-emission methanol hydrogen production and hydrogenation integrated system

Abstract

The utility model discloses a zero carbon emission methanol hydrogen production and hydrogenation integrated system, which relates to the technical field of hydrogen production and comprises a methanol hydrogen production module, a purification unit, a compression storage unit, a hydrogenation unit and a tail gas treatment unit, the methanol hydrogen production module is composed of a purified water system, a methanol storage tank, a raw material preparation module, a hydrogen production unit and a heating unit, the integration of hydrogen production and hydrogenation is realized in the station by sharing a compressor and the storage tank, the system can be in a hot standby state, a methanol solution is injected, and high-purity hydrogen can be produced at any time. The system can be in a hot standby state in the time period when less hydrogen is needed, and the storage amount of hydrogen in the hydrogen production and hydrogenation system can be effectively reduced in the mode, so that the safety coefficient of the system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen production, and in particular to a zero-carbon emission methanol hydrogen production and hydrogenation integrated system. Background Art

[0002] The carbon-free methanol hydrogenation and hydrogenation integrated system is an advanced energy system. Its core concept is to achieve the green and low-carbon production of hydrogen through methanol hydrogenation technology, and combine the function of hydrogenation station to form an integrated system. The carbon-free methanol hydrogenation and hydrogenation integrated system is an advanced energy system. Its core concept is to achieve the green and low-carbon production of hydrogen through methanol hydrogenation technology, and combine the function of hydrogenation station to form an integrated system.

[0003] Usually, the steps of hydrogen production and hydrogenation are rather complicated and need to be produced separately, resulting in a low degree of integration and slow preparation efficiency. Therefore, we propose a zero-carbon emission methanol hydrogenation integrated system to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a zero-carbon emission methanol hydrogen production and hydrogenation integrated system to solve the problem mentioned in the above background technology that the steps of conventional hydrogen production and hydrogenation are relatively cumbersome and need to be produced separately, resulting in low integration and slow preparation efficiency.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a zero-carbon emission methanol hydrogen production and hydrogenation integrated system, including a methanol hydrogen production module, a purification unit, a compression storage unit, a hydrogenation unit and a tail gas treatment unit;

[0006] Also includes:

[0007] The methanol hydrogen production module consists of a pure water system, a methanol storage tank, a raw material preparation module, a hydrogen production unit and a heating unit. The pure water system and the methanol storage tank are connected to the raw material preparation module through pipelines, and the raw material preparation module is connected to the hydrogen production unit through pipelines.

[0008] Preferably, one end of the hydrogen production unit is connected to the heating unit via a pipeline, and the other end of the hydrogen production unit is connected to the purification unit via a pipeline.

[0009] Preferably, the tail gas treatment unit is a decomposition gas oxidation chamber, the decomposition gas oxidation chamber and the heating unit are connected to each other through a pipeline, and the decomposition gas oxidation chamber and the purification unit are connected through a pipeline.

[0010] Preferably, the compression storage unit consists of a hydrogen compressor and a hydrogen storage tank, and the hydrogen compressor is connected to the hydrogen storage tank through a pipeline, and the hydrogen storage tank is connected to the hydrogenation unit through a pipeline, and the purification unit is connected to the hydrogen compressor through a pipeline.

[0011] Preferably, a buffer tank is connected to the inlet of the hydrogen compressor.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. Methanol and pure water are mixed in proportion and then enter the hydrogen production unit. There is a catalyst in the hydrogen production unit. A certain pressure is maintained by a pump, and a certain temperature is maintained by a heating unit. What comes out of the hydrogen production unit is hydrogen-rich oxidation, the main components of which are hydrogen and carbon dioxide. Among them, hydrogen accounts for 25% and hydrogen accounts for 75%. The hydrogen production process is an endothermic reaction and a certain temperature needs to be maintained. In this patent, the heating of the reaction process is basically obtained by oxidizing the exhaust gas discharged by the purification unit, and methanol is appropriately added to the insufficient part. In addition to the heat released by methanol oxidation, the heating when the system is started also uses part of the electrical energy, mainly for the convenience of control.

[0014] The purification unit adopts pressure swing adsorption or palladium membrane purification according to the amount of hydrogen. For the purification method in the hydrogen production station, pressure swing adsorption is generally adopted. This method has stable performance and is suitable for handling scenarios with large hydrogen flow rates. In the purification unit, there is an inlet and two outlets. The inlet is connected to the hydrogen production unit, and the hydrogen-rich gas enters the purification unit. The outlet is divided into a high-purity hydrogen outlet and an exhaust gas outlet. The high-purity hydrogen outlet is connected to the inlet of the hydrogen compressor. The main content of the exhaust gas is carbon dioxide gas, and there is also a small amount of hydrogen, with a ratio of about 95% carbon dioxide and 5% hydrogen.

[0015] 2. To ensure the normal operation of the hydrogen compressor, a buffer tank is set at the inlet of the hydrogen compressor to ensure that the compressor can absorb hydrogen at any time. Through two-stage compression, the purified hydrogen is stored in the hydrogen storage tank. The capacity of the hydrogen storage tank is set comprehensively according to the hydrogen production output and the characteristics of hydrogenation. The hydrogenation unit is matched with the hydrogen storage unit, and hydrogen is added to the new energy vehicle through the hydrogenation gun.

[0016] By sharing the compressor and storage tank, the station can realize the integration of hydrogen production and hydrogenation. The system can be in hot standby mode, inject methanol solution, and produce high-purity hydrogen at any time. During the period when the demand for hydrogen is low, the system can be in hot standby mode. This method can effectively reduce the hydrogen inventory in the hydrogen production and hydrogenation system, thereby improving the safety factor of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the hydrogen compressor and buffer tank of the utility model;

[0019] In the figure: 1. Pure water system; 2. Methanol storage tank; 3. Raw material preparation module; 4. Hydrogen production unit; 5. Purification unit; 6. Hydrogen compressor; 7. Hydrogen storage tank; 8. Analysis gas oxidation chamber; 9. Heating unit; 10. Hydrogenation unit; 11. Buffer tank. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] See also Figure 1-2 , the utility model provides an embodiment: a zero-carbon emission methanol hydrogenation and hydrogenation integrated system, including a methanol hydrogenation module, a purification unit 5, a compression storage unit, a hydrogenation unit 10 and a tail gas treatment unit;

[0022] Also includes:

[0023] The methanol hydrogen production module consists of a pure water system 1, a methanol storage tank 2, a raw material preparation module 3, a hydrogen production unit 4 and a heating unit 9. The pure water system 1 and the methanol storage tank 2 are connected to the raw material preparation module 3 through pipelines, and the raw material preparation module 3 is connected to the hydrogen production unit 4 through pipelines.

[0024] See also Figure 1 One end of the hydrogen production unit 4 is connected to the heating unit 9 through a pipeline, and the other end of the hydrogen production unit 4 is connected to the purification unit 5 through a pipeline.

[0025] See also Figure 1 The tail gas treatment unit is a decomposition gas oxidation chamber 8, the decomposition gas oxidation chamber 8 and the heating unit 9 are connected to each other through a pipeline, and the decomposition gas oxidation chamber 8 and the purification unit 5 are connected through a pipeline.

[0026] See also Figure 1 The compression storage unit is composed of a hydrogen compressor 6 and a hydrogen storage tank 7, and the hydrogen compressor 6 is connected to the hydrogen storage tank 7 through a pipeline, and the hydrogen storage tank 7 is connected to the hydrogenation unit 10 through a pipeline, and the purification unit 5 is connected to the hydrogen compressor 6 through a pipeline.

[0027] See also Figure 2 A buffer tank 11 is connected to the inlet of the hydrogen compressor 6 .

[0028] Working principle: Methanol and pure water are mixed in proportion and then enter the hydrogen production unit 4. There is a catalyst in the hydrogen production unit 4. A certain pressure is maintained by a pump, and a certain temperature is maintained by a heating unit 9. What comes out of the hydrogen production unit 4 is hydrogen-rich hydrogen, the main components of which are hydrogen and carbon dioxide. Among them, hydrogen accounts for 25% and hydrogen accounts for 75%. The hydrogen production process is an endothermic reaction and a certain temperature needs to be maintained. In this patent, the heating of the reaction process is basically obtained by oxidizing the tail gas discharged by the purification unit 5, and methanol is appropriately added to the insufficient part. In addition to the heat released by methanol oxidation, the heating when the system is started also uses part of the electrical energy, mainly for the convenience of control.

[0029] The purification unit 5 adopts pressure swing adsorption or palladium membrane purification according to the amount of hydrogen. For the purification method in the hydrogen production station, pressure swing adsorption is generally adopted. This method has stable performance and is suitable for processing scenes with large hydrogen flow rates. In the purification unit 5, there is an inlet and two outlets. The inlet is connected to the hydrogen production unit 4, and the hydrogen-rich gas enters the purification unit 5. The outlet is divided into a high-purity hydrogen outlet and an exhaust gas outlet. The high-purity hydrogen outlet is connected to the inlet of the hydrogen compressor 6. The main content of the exhaust gas is carbon dioxide gas, and there is also a small amount of hydrogen, with a ratio of about 95% carbon dioxide and 5% hydrogen.

[0030] The analytical gas oxidation chamber 8 has an inlet and an outlet. In the analytical gas oxidation chamber 8, the tail gas with a low hydrogen content is oxidized here to release heat. A pipeline is set on one side of the analytical gas oxidation chamber 8, and oxygen is provided to the analytical gas oxidation chamber 8 through the pipeline. At the same time, a relatively high temperature of more than 800°C is maintained in the analytical gas oxidation chamber 8 to ensure that hydrogen is fully oxidized when there is an oxygen supply. Since the tail gas contains only carbon dioxide gas and hydrogen. Under high temperature conditions, the hydrogen in the tail gas reacts with oxygen to release heat, and finally there is only carbon dioxide and water in the tail gas. Through air cooling or water cooling, the water in the tail gas can be condensed, leaving only high-purity carbon dioxide gas. After the carbon dioxide gas is collected, it can be used for carbon dioxide gas shielded welding, making dry ice, etc. Zero carbon emissions are achieved in the process of using methanol to produce hydrogen.

[0031] In order to ensure the normal operation of the hydrogen compressor 6, a buffer tank 11 is set at the inlet of the hydrogen compressor 6 to ensure that the compressor can absorb hydrogen at any time. Through two-stage compression, the purified hydrogen is stored in the hydrogen storage tank 7. The capacity of the hydrogen storage tank 7 is set comprehensively according to the characteristics of hydrogen production and hydrogenation. The hydrogenation unit 10 is matched with the hydrogen storage unit, and hydrogen is added to the new energy vehicle through the hydrogenation gun.

[0032] By sharing the compressor and storage tank, the station can realize the integration of hydrogen production and hydrogenation. The system can be in hot standby mode, inject methanol solution, and produce high-purity hydrogen at any time. During the period when the demand for hydrogen is low, the system can be in hot standby mode. This method can effectively reduce the hydrogen inventory in the hydrogen production and hydrogenation system, thereby improving the safety factor of the system.

[0033] The tail gas treatment process can obtain heat, high-purity carbon dioxide and condensed water. The heat in the process can be used to heat the thermal oil and provide heat for the hydrogen production process. As shown in the figure, a heat exchanger is set in the analytical gas oxidation chamber 8 to heat the thermal oil. Carbon dioxide and water vapor are exported through a pipeline, and a condenser is set after the pipeline to separate carbon dioxide gas and condensed water. The capture and utilization of carbon dioxide in the methanol hydrogen production process is realized.

[0034] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A zero-carbon emission methanol hydrogenation integrated system, comprising a methanol hydrogenation module, a purification unit (5), a compression storage unit, a hydrogenation unit (10) and a tail gas treatment unit; Features: Also includes: The methanol hydrogen production module is composed of a pure water system (1), a methanol storage tank (2), a raw material preparation module (3), a hydrogen production unit (4) and a heating unit (9). The pure water system (1) and the methanol storage tank (2) are connected to the raw material preparation module (3) through a pipeline, and the raw material preparation module (3) is connected to the hydrogen production unit (4) through a pipeline.

2. A zero-carbon emission methanol hydrogenation integrated system according to claim 1, characterized in that: One end of the hydrogen production unit (4) is connected to the heating unit (9) via a pipeline, and the other end of the hydrogen production unit (4) is connected to the purification unit (5) via a pipeline.

3. The zero-carbon emission methanol hydrogenation integrated system according to claim 1 is characterized by: The tail gas treatment unit is a decomposition gas oxidation chamber (8), the decomposition gas oxidation chamber (8) and the heating unit (9) are connected to each other through a pipeline, and the decomposition gas oxidation chamber (8) and the purification unit (5) are connected through a pipeline.

4. The zero-carbon emission methanol hydrogenation integrated system according to claim 1 is characterized by: The compression storage unit is composed of a hydrogen compressor (6) and a hydrogen storage tank (7), and the hydrogen compressor (6) is connected to the hydrogen storage tank (7) through a pipeline, and the hydrogen storage tank (7) is connected to the hydrogenation unit (10) through a pipeline, and the purification unit (5) is connected to the hydrogen compressor (6) through a pipeline.

5. A zero-carbon emission methanol hydrogen production and hydrogenation integrated system according to claim 4, characterized in that: The inlet of the hydrogen compressor (6) is connected to a buffer tank (11).

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