Natural gas reforming hydrogen system

Abstract

The utility model discloses a system for reforming hydrogen from natural gas. The system comprises a desulfurizing tower, a steam mixer, a preheater, a reforming reactor, a water-gas conversion tower, a cooling tower, a gas-liquid separator, a carbon dioxide absorption tower and an adsorption tower which are sequentially connected through gas pipelines, a booster pump, a pressure control valve and an emergency cut-off valve are arranged on the upstream gas pipeline of the desulfurization tower; a regulating valve is arranged between the desulfurizing tower and the steam mixer; a temperature control valve and a high-temperature switching valve are arranged between the reforming reactor and the water-gas conversion tower; a purified gas control valve is arranged between the carbon dioxide absorption tower and the adsorption tower, and a product hydrogen outlet valve is arranged at the downstream of the adsorption tower; the system further comprises a carbon dioxide capturing pipeline connected with the carbon dioxide absorption tower, the carbon dioxide capturing pipeline is provided with a regeneration tower and a carbon dioxide compressor, and one end of the carbon dioxide capturing pipeline is connected with a liquid carbon dioxide storage tank. The whole system is simple and reasonable, the production cost is relatively low, carbon capture can be achieved, and the system is more environmentally friendly.

Description

Technical Field

[0001] This utility model relates to natural gas reforming hydrogen technology, and more particularly to a natural gas reforming hydrogen system. Background Technology

[0002] Hydrogen energy has attracted widespread attention due to its high efficiency and environmental friendliness. Among them, natural gas reforming hydrogen production technology has become one of the more mature hydrogen production methods due to the availability of raw materials. However, the overall system of natural gas reforming hydrogen production is complex and costly, and it cannot treat the carbon dioxide generated in the process, making it less environmentally friendly. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a natural gas reforming hydrogen system.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: A natural gas reforming hydrogen system is constructed, comprising a desulfurization tower, a steam mixer, a preheater, a reforming reactor, a water-vapor shift tower, a cooling tower, a gas-liquid separator, a carbon dioxide absorption tower, and an adsorption tower, connected sequentially via a gas transmission pipeline; the gas transmission pipeline upstream of the desulfurization tower is equipped with a booster pump, a pressure control valve, and an emergency shut-off valve, and the booster pump is connected to a natural gas source; the gas transmission pipeline between the desulfurization tower and the steam mixer is equipped with a regulating valve; the gas transmission pipeline between the reforming reactor and the water-vapor shift tower is equipped with a temperature control valve and a high-temperature switching valve; the gas transmission pipeline between the carbon dioxide absorption tower and the adsorption tower is equipped with a purified gas control valve; and the gas transmission pipeline downstream of the adsorption tower is equipped with a product hydrogen outlet valve.

[0005] The natural gas reforming hydrogen system also includes a carbon dioxide capture pipeline connected to the carbon dioxide absorption tower. The carbon dioxide capture pipeline is equipped with a regeneration tower and a carbon dioxide compressor. The end of the carbon dioxide capture pipeline away from the carbon dioxide absorption tower is connected to a liquid carbon dioxide storage tank.

[0006] In some embodiments, the portion of the carbon dioxide capture pipeline located between the carbon dioxide absorption tower and the regeneration tower is provided with a lean liquid regulating valve.

[0007] In some embodiments, the portion of the carbon dioxide capture pipeline located between the regeneration tower and the carbon dioxide compressor is equipped with a steam regulating valve.

[0008] In some embodiments, the portion of the carbon dioxide capture pipeline located between the carbon dioxide compressor and the liquid carbon dioxide storage tank is provided with a pressure relief valve.

[0009] In some embodiments, the natural gas reforming hydrogen system further includes a drain pipe connected to the gas-liquid separator, and the drain pipe is equipped with a liquid level control valve and a condensate pump.

[0010] In some embodiments, the end of the drain pipe away from the gas-liquid separator is connected to a storage tank.

[0011] In some embodiments, the natural gas reforming hydrogen system further includes a buffer tank connected to the product hydrogen outlet valve.

[0012] In some embodiments, the natural gas reforming hydrogen system further includes a plurality of fuel cell units connected to the buffer tank.

[0013] In some embodiments, the adsorption tower is a PSA adsorption tower.

[0014] In some embodiments, a pressure gauge is provided between the adsorption tower and the product hydrogen outlet valve.

[0015] The implementation of this utility model has the following beneficial effects: the natural gas reforming hydrogen system is relatively simple and reasonable, has high hydrogen production efficiency, relatively low production cost, and can achieve carbon capture, enabling clean and efficient energy utilization, which is more environmentally friendly. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of a natural gas reforming hydrogen system in some embodiments of this utility model. Detailed Implementation

[0018] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0019] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0020] In the following description, specific details such as particular system structures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand that the present invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0021] See Figure 1 This utility model discloses a natural gas reforming hydrogen system, which can be used for natural gas reforming and to generate hydrogen for fuel cell power generation. It is mainly applicable to the fields of distributed energy stations, backup power supplies and mobile power supply equipment.

[0022] The natural gas reforming hydrogen system includes a desulfurization tower 11, a steam mixer 12, a preheater 13, a reforming reactor 14, a water-steam shift tower 15, a cooling tower 16, a gas-liquid separator 17, a carbon dioxide absorption tower 18, and an adsorption tower 19, which are connected in sequence via a gas transmission pipeline 10. The adsorption tower 19 is a PSA adsorption tower.

[0023] The gas pipeline 10 upstream of the desulfurization tower 11 is equipped with a booster pump 110, a pressure control valve 111, and an emergency shut-off valve 112. The booster pump 110 is connected to a natural gas source, which may include municipal natural gas. The gas pipeline 10 between the desulfurization tower 11 and the regulating valve 113 is equipped with a regulating valve 113, which may be a flow regulating valve. The gas pipeline 10 between the reforming reactor 14 and the water-gas shift tower 15 is equipped with a temperature control valve 114 and a high-temperature switching valve 115. The gas pipeline 10 between the carbon dioxide absorption tower 18 and the adsorption tower 19 is equipped with a purified gas control valve 116. The gas pipeline 10 downstream of the adsorption tower 19 is equipped with a product hydrogen outlet valve 117.

[0024] The natural gas reforming hydrogen system also includes a buffer tank 118 connected to the product hydrogen outlet valve 117. The buffer tank 118 is used to balance the fluctuations in hydrogen production during the hydrogen production process and to stably supply the fuel cell unit 40. In some embodiments, a pressure gauge is provided between the adsorption tower 19 and the product hydrogen outlet valve 117.

[0025] The natural gas reforming hydrogen system also includes a carbon dioxide capture pipeline 20 connected to the carbon dioxide absorption tower 18. The carbon dioxide capture pipeline 20 is equipped with a regeneration tower 21 and a carbon dioxide compressor 22. One end of the carbon dioxide capture pipeline 20 away from the carbon dioxide absorption tower 18 is connected to a liquid carbon dioxide storage tank 23.

[0026] In some embodiments, the portion of the carbon dioxide capture pipe 20 located between the carbon dioxide absorption tower 18 and the regeneration tower 21 is provided with a lean liquid regulating valve 24.

[0027] In some embodiments, the portion of the carbon dioxide capture pipe 20 located between the regeneration tower 21 and the carbon dioxide compressor 22 is provided with a steam regulating valve 25.

[0028] In some embodiments, the portion of the carbon dioxide capture pipe 20 located between the carbon dioxide compressor 22 and the liquid carbon dioxide storage tank 23 is provided with a pressure relief valve 26.

[0029] In some embodiments, the natural gas reforming hydrogen system further includes a drain pipe 30 connected to the gas-liquid separator 17, and the drain pipe 30 is provided with a liquid level control valve 31 and a condensate pump 32.

[0030] In some embodiments, the end of the drain pipe 30 away from the gas-liquid separator 17 is connected to a storage tank.

[0031] In some embodiments, the natural gas reforming hydrogen system further includes a plurality of fuel cell units 40 connected to the buffer tank.

[0032] In some embodiments, the natural gas reforming hydrogen system may further include a PCS control cabinet connected to several fuel cell units 40, and a 35kV transformer substation and a step-up substation connected in sequence to the PCS control cabinet. The PCS (Power Conversion System) control cabinet converts the DC power stored in the battery into AC power output through bidirectional converter technology.

[0033] The application of this natural gas reforming hydrogen system is as follows: Municipal natural gas is pressurized by booster pump 110, and then enters desulfurization tower 11 through pressure control valve 111 and emergency shut-off valve 112, where desulfurization tower 11 removes sulfides from the natural gas. The booster pump 110, pressure control valve 111, and emergency shut-off valve 112 work together to pre-treat municipal natural gas and ensure that the natural gas entering desulfurization tower 11 meets process requirements.

[0034] After desulfurization, the natural gas enters the preheater 13 under the control of the regulating valve 113. The natural gas and steam are preheated in the preheater 13, and after being mixed by the steam mixer 12, they enter the reforming reactor 14, where a methane steam reforming reaction takes place at a high temperature to produce hydrogen, CO, and a small amount of CO2. The preheater 13 is used to preheat the natural gas and steam to improve the efficiency of the reforming reaction.

[0035] The reformed outlet gas, after being regulated by temperature control valve 114 and high-temperature switching valve 115, enters the water-gas shift tower 15, where CO reacts with water to generate more hydrogen and CO2. Temperature control valve 114 and high-temperature switching valve 115 regulate the temperature and flow direction of the reformed outlet gas to ensure the water-gas shift reaction proceeds under optimal conditions. Cooling tower 16 cools the reaction gas, and condensate is separated by gas-liquid separator 17 and level control valve 31. The condensate is then discharged by condensate pump 32.

[0036] The cooled reaction gas enters the carbon dioxide absorption tower 18, where CO2 is removed by the absorbent liquid. The absorbent liquid is sent to the regeneration tower 21 for regeneration, with the steam flow controlled by the steam regulating valve 25. The CO2 is compressed by the carbon dioxide compressor 22 and stored in the liquid carbon dioxide storage tank 23. The adsorption tower 19 further purifies the gas to obtain high-purity hydrogen (99.999%), and the product hydrogen is output through the product hydrogen outlet valve 117. In essence, by first absorbing CO2 from the reaction tail gas in the carbon dioxide absorption tower 18 and then further purifying the gas using the adsorption tower 19, high-purity hydrogen can be obtained.

[0037] Pure hydrogen enters buffer tank 118 through product hydrogen outlet valve 117 to stabilize hydrogen supply pressure; buffered hydrogen is then delivered to multiple fuel cell units 40 (such as fuel cell 1#, fuel cell 2#, and fuel cell 3#), where it is mixed with air to generate direct current through an electrochemical reaction. This direct current is then converted into alternating current by the PCS control cabinet and connected to the power grid through a 35kV transformer and a booster station.

[0038] The proposed natural gas reforming hydrogen system, with a capacity of 5MW, is constructed in an industrial park. It uses municipal natural gas as feedstock, with an inlet pressure of 0.4MPa. After pressurization by booster pump 110, the gas passes through pressure control valve 111 and emergency shut-off valve 112 before entering desulfurization tower 11, where sulfides are removed. The desulfurized natural gas, controlled by regulating valve 113, enters preheater 13, where it is preheated with steam. After mixing in steam mixer 12, the mixture enters reforming reactor 14. Alternatively, the gas can first enter steam mixer 12 for mixing, then preheat in preheater 13 before entering reforming reactor 14. Methane steam reforming is carried out at a reaction temperature of 850℃. The generated hydrogen-rich gas is purified by adsorption tower 19 to a pure hydrogen content of 99.99%. The hydrogen enters fuel cell unit 40 to generate electricity. The PCS control cabinet outputs AC power, which is then connected to the power grid via a 35kV step-up substation. After passing through the carbon dioxide capture pipe 20, the CO2 capture rate reaches over 90%, which can be used for industrial applications or storage. The positions of the steam mixer 12 and the preheater 13 can be interchanged as needed; no specific restrictions are made here.

[0039] In some embodiments, the desulfurization tower 11 is designated V-001, the steam mixer 12 is designated M-101, the preheater 13 is designated HE-101, the reforming reactor 14 is designated R-101, the steam-water conversion tower 15 is designated R-201, the cooling tower 16 is designated HE-201, and the gas-liquid separator 17 is designated V-301.

[0040] The booster pump 110 is designated P-101, the pressure control valve 111 is designated PCV-101, the emergency shut-off valve 112 is designated ESD-1, the regulating valve 113 is designated FV-102, the temperature control valve 114 is designated TCV-202, the high temperature switching valve 115 is designated XV-201, the purified gas control valve 116 is designated XV-501, and the product hydrogen outlet valve 117 is designated XV-201.

[0041] The tag number of regeneration tower 21 is T-402, the tag number of liquid carbon dioxide storage tank 23 is V-402, the tag number of lean liquid regulating valve 24 is LCV-301, the tag number of steam regulating valve 25 is FV-402, and the tag number of pressure relief valve 26 is PRV-401.

[0042] The tag number of the level control valve 31 is LCV-301, and the tag number of the condensate pump 32 is P-301.

[0043] Understandably, this natural gas reforming hydrogen system is relatively simple and reasonable overall. It has high hydrogen production efficiency, relatively low production cost, and can achieve carbon capture, enabling clean and efficient energy utilization, which is more environmentally friendly.

[0044] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A natural gas reforming hydrogen system, characterized in that, The system includes a desulfurization tower (11), a steam mixer (12), a preheater (13), a reforming reactor (14), a water-steam shift tower (15), a cooling tower (16), a gas-liquid separator (17), a carbon dioxide absorption tower (18), and an adsorption tower (19), all connected in sequence via a gas transmission pipeline (10). The gas transmission pipeline (10) upstream of the desulfurization tower (11) is equipped with a booster pump (110), a pressure control valve (111), and an emergency shut-off valve (112). The booster pump (110) is connected to a natural gas source. (11) A regulating valve (113) is provided in the gas transmission pipeline (10) between the steam mixer (12); a temperature control valve (114) and a high temperature switching valve (115) are provided in the gas transmission pipeline (10) between the reforming reactor (14) and the water vapor shift tower (15); a purified gas control valve (116) is provided in the gas transmission pipeline (10) between the carbon dioxide absorption tower (18) and the adsorption tower (19); and a product hydrogen outlet valve (117) is provided in the gas transmission pipeline (10) downstream of the adsorption tower (19). The natural gas reforming hydrogen system also includes a carbon dioxide capture pipeline (20) connected to the carbon dioxide absorption tower (18). The carbon dioxide capture pipeline (20) is equipped with a regeneration tower (21) and a carbon dioxide compressor (22). The end of the carbon dioxide capture pipeline (20) away from the carbon dioxide absorption tower (18) is connected to a liquid carbon dioxide storage tank (23).

2. The natural gas reforming hydrogen system according to claim 1, characterized in that, The portion of the carbon dioxide capture pipeline (20) located between the carbon dioxide absorption tower (18) and the regeneration tower (21) is equipped with a lean liquid regulating valve (24).

3. The natural gas reforming hydrogen system according to claim 1, characterized in that, The portion of the carbon dioxide capture pipeline (20) located between the regeneration tower (21) and the carbon dioxide compressor (22) is equipped with a steam regulating valve (25).

4. The natural gas reforming hydrogen system according to claim 1, characterized in that, The portion of the carbon dioxide capture pipeline (20) located between the carbon dioxide compressor (22) and the liquid carbon dioxide storage tank (23) is equipped with a pressure relief valve (26).

5. The natural gas reforming hydrogen system according to claim 1, characterized in that, The natural gas reforming hydrogen system also includes a drain pipe (30) connected to the gas-liquid separator (17), and the drain pipe (30) is equipped with a liquid level control valve (31) and a condensate pump (32).

6. The natural gas reforming hydrogen system according to claim 5, characterized in that, The end of the drain pipe (30) away from the gas-liquid separator (17) is connected to a storage tank.

7. The natural gas reforming hydrogen system according to claim 1, characterized in that, The natural gas reforming hydrogen system also includes a buffer tank (118) connected to the product hydrogen outlet valve (117).

8. The natural gas reforming hydrogen system according to claim 7, characterized in that, The natural gas reforming hydrogen system also includes several fuel cell units (40) connected to the buffer tank.

9. The natural gas reforming hydrogen system according to claim 1, characterized in that, The adsorption tower (19) is a PSA adsorption tower.

10. The natural gas reforming hydrogen system according to claim 1, characterized in that, A pressure gauge is provided between the adsorption tower (19) and the product hydrogen outlet valve (117).

Images