Hydrogen production system

Abstract

The invention provides a hydrogen production system, and belongs to the field of nuclear energy. The problem that the nickel catalytic hydrogen production efficiency is limited due to the fact that the main steam temperature of an existing thorium-based molten salt reactor nuclear secondary loop is not enough is solved. The system comprises a main heat exchanger, the hot side of the main heat exchanger is coupled with a thorium-based molten salt reactor, the cold side of the main heat exchanger is respectively coupled with a hydrolysis reaction area in a heat pump system and the hot sides of a plurality of secondary preheaters, and working cycle working gas of the heat pump system is coupled with the cold sides of the preheaters; and the nickel catalytic reactor is coupled with the hydration reaction area in the heat pump system and is used for catalyzing hydrogen production after absorbing heat. The device is mainly used for hydrogen production.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of nuclear energy, and particularly relates to a hydrogen production system. BACKGROUND

[0002] Due to the environmental hazards caused by the burning of fossil fuels by various industrial enterprises, including climate problems such as global warming, global people have paid great attention to it. Compared with fossil fuels, hydrogen energy is a new type of clean energy and is highly expected. At the same time, nuclear energy is a kind of efficient and low-carbon energy, which is also concerned under this trend.

[0003] In industrial hydrogen production, nickel catalytic hydrocarbon material hydrogen production is one of the most widely used thermochemical catalytic processes. This process uses the process heat of a thorium-based molten salt reactor to achieve hydrogen production from hydrocarbons through nickel catalyst thermochemical catalysis. However, due to the limitation of the main steam temperature of the thorium-based molten salt reactor nuclear secondary loop, the improvement of the efficiency of nickel catalytic hydrogen production is severely limited. SUMMARY

[0004] Therefore, the present application aims to provide a hydrogen production system to solve the problem that the main steam temperature of the existing thorium-based molten salt reactor nuclear secondary loop is not enough to limit the efficiency of nickel catalytic hydrogen production.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: a hydrogen production system, comprising: a main heat exchanger, the hot side of which is coupled with a thorium-based molten salt reactor, and the cold side of which is coupled with a hydrolysis reaction area in a heat pump system, the hot side of a plurality of secondary preheaters, and the working gas of the working cycle of the heat pump system is coupled with the cold side of a plurality of preheaters; a nickel catalytic reactor, and a hydration reaction area in a heat pump system, for catalytic hydrogen production after absorbing heat.

[0006] Further, the working gas circulates in the hydrolysis reaction area and the hydration reaction area through pipelines, a steam generator is arranged on a first pipeline through which the working gas flows from the hydrolysis reaction area to the hydration reaction area, and a dryer is arranged on a second pipeline through which the working gas flows from the hydration reaction area to the hydrolysis reaction area.

[0007] Further, a circulating pump four is arranged on the first pipeline, and a circulating pump three is arranged on the second pipeline.

[0008] Further, the plurality of secondary preheaters comprises a reheating device, a preheater one and a preheater two, the cold side of the preheater two and the cold side of the reheating device are sequentially coupled with the first pipeline, and the cold side of the preheater one is coupled with the second pipeline.

[0009] Further, the steam generator is arranged between the preheater second cooling side and the reheating device cooling side.

[0010] Further, the second pipeline gas is coupled with the preheater first cooling side after being dried by the dryer.

[0011] Further, the hydration reaction area is coupled with the nickel catalytic reactor through a helium pipeline, and a circulating pump five is arranged on the helium pipeline.

[0012] Further, the The heat pump system comprises A dehydrated fluidized bed reactor, A hydration fluidized bed reactor, a first conveying assembly and a second conveying assembly, the first conveying assembly is used for conveying The particles obtained by dehydration in the dehydrated fluidized bed reactor to The hydration fluidized bed reactor, and the second conveying assembly is used for conveying The particles obtained by hydration in the hydration fluidized bed reactor to The dehydrated fluidized bed reactor.

[0013] Further, the conveying areas of the first conveying assembly and the second conveying assembly are in heat exchange with the regenerative device.

[0014] Further, the first conveying assembly and the second conveying assembly are both screw rods.

[0015] Compared with the prior art, the present application has the following beneficial effects: The system couples the thorium-based molten salt reactor with The heat pump system, through the main heat exchanger, uses the coolant at the outlet of the high-temperature gas cooled reactor as the medium-temperature driving heat source of the heat pump, realizes the improvement of the heat quality of the medium-temperature heat source of the thorium-based molten salt, and compared with the traditional thorium-based molten salt reactor for hydrogen production, the temperature limitation of the current hydrogen production technology is broken through by the temperature rising technology provided by the system, higher hydrogen production efficiency is obtained, nuclear power generation is realized, efficient conversion of nuclear energy is realized, and the economic benefit of the thorium-based molten salt reactor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide further understanding of the present application, the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings: Figure 1 It is a structure schematic view of a hydrogen production system described in the present application; Figure 2 It is a structure schematic view of The hydration fluidized bed reactor described in the present application;​​ Figure 3 For the present invention Structure diagram of the dehydrated fluidized bed reactor.

[0017] Thorium-based molten salt reactor 1; main heat exchanger 2; dehydrated fluidized bed reactor 3; hydrated fluidized bed reactor 4; transmission screw 5; transmission screw 6; heat recovery device 7; steam generator 8; dryer 9; reheating device 10; preheater 1 11; preheater 2 12; circulating pump 1 13; circulating pump 2 14; circulating pump 3 15; circulating pump 4 16; circulating pump 5 17; nickel catalytic reactor 18. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present application, not all the embodiments.

[0019] It should be noted that the descriptions of "left", "right", "left side", "right side", "upper", "lower", "top", "bottom" and the like in the present application are all defined based on the positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the described structure must be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0020] In the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0021] Referring to the accompanying drawings, a hydrogen production system comprises: The main heat exchanger 2 is coupled with the thorium-based molten salt reactor 1 on the hot side, and is coupled with the dehydrated fluidized bed reactor 3 and the hydrated fluidized bed reactor 4 on the cold side, respectively. The hydrolysis reaction area in the heat pump system is coupled with the hot side of the several secondary preheaters, and the working cycle working gas of the heat pump system is coupled with the cold side of the several preheaters; the heat of the thorium-based molten salt reactor 1 is used to transfer to the dehydrated fluidized bed reactor 3 and the hydrated fluidized bed reactor 4 through the main heat exchanger 2. The hydrolysis reaction area in the heat pump system is coupled with the hot side of the several secondary preheaters, and the working cycle working gas of the heat pump system is coupled with the cold side of the several preheaters; the heat of the thorium-based molten salt reactor 1 is used to transfer to the dehydrated fluidized bed reactor 3 and the hydrated fluidized bed reactor 4 through the main heat exchanger 2. The heat pump system and several secondary preheaters, so that the heat is well utilized. Specifically, the high-temperature side outlet of the main heat exchanger 2 is connected with the coolant inlet of the thorium-based molten salt reactor 1; the high-temperature coolant outlet of the thorium-based molten salt reactor 1 enters the high-temperature side of the main heat exchanger 2, heats the low-temperature side of the main heat exchanger 2, and performs heat transfer. Part of the heat transfer medium heated by the main heat exchanger 2 and The heat pump system is directly circulated back to the main heat exchanger 2 after heat exchange, and another part of the heat transfer medium enters the reheating device 10, the preheater one 11 and the preheater two 12 and exchanges heat with the working gas in the working gas pipeline. The working gas is heated by the helium in the reheating device 10, the preheater one 11 and the preheater two 12. A circulating pump one 13 is arranged on the flow path connected with the reheating device 10 and the preheater two 12 of the main heat exchanger 2, for circulating the heat transfer medium. A circulating pump two 14 is arranged on the flow path of the main heat exchanger 2 and the preheater one 11 for circulating the heat transfer medium.

[0022] A nickel catalytic reactor 18 is coupled with the hydration reaction area in the heat pump system, for catalyzing hydrogen production after absorbing heat. A nickel catalytic reactor 18 is coupled with the hydration reaction area in the heat pump system, for catalyzing hydrogen production after absorbing heat.

[0023] In the embodiment, the working gas circulates through pipelines in the hydrolysis reaction area and the hydration reaction area, a steam generator 8 is arranged on the first pipeline through which the working gas flows from the hydrolysis reaction area to the hydration reaction area, and a dryer 9 is arranged on the second pipeline through which the working gas flows from the hydration reaction area to the hydrolysis reaction area.

[0024] In the embodiment, a circulating pump four 16 is arranged on the first pipeline, and a circulating pump three 15 is arranged on the second pipeline. The circulating pump four 16 and the circulating pump three 15 are arranged to circulate the medium on the corresponding pipeline.

[0025] In the embodiment, the several secondary preheaters include the reheating device 10, the preheater one 11 and the preheater two 12, the cold side of the preheater two 12 and the cold side of the reheating device 10 are sequentially coupled with the first pipeline, and the cold side of the preheater one 11 is coupled with the second pipeline. The reheating device 10, the preheater one 11 and the preheater two 12 are arranged to realize the step-by-step utilization of heat energy, and the number of the preheaters can be increased or reduced according to actual needs, and reasonable arrangement can be made according to actual needs.

[0026] In the embodiment, the steam generator 8 is arranged between the cold side of the preheater two 12 and the cold side of the reheating device 10. The steam generator 8 is arranged to supply water to the working gas, so that the corresponding reaction can be smoothly carried out.

[0027] In this embodiment, the gas in the second pipeline is dried by the dryer 9 and then coupled to the cold side of the preheater 11. The dryer 9 is provided to dry the working gas. Water vapor is mixed with the working gas in the pipeline through the steam generator 8. In the hydrated fluidized bed reactor 4, the working gas after the reaction is dried and then recycled back to the reactor. 3. Dehydration fluidized bed reactor. Dehydration fluidized bed reactor 3 and The working gas is introduced from bottom to top in the direction perpendicular to the ground inside the hydrated fluidized bed reactor 4 to complete the fluidization and dehydration / hydration of the solid. In the plane parallel to the ground, the solid is introduced and the heat exchange pipes are laid in two orthogonal dimensions respectively.

[0028] In this embodiment, the hydration reaction zone is coupled to the nickel catalytic reactor 18 via a helium pipeline, on which a circulation pump 17 is installed. The circulation pump 17 circulates the helium in the pipeline, facilitating heat transfer and supplementing the heat from the hydration reaction to the nickel catalytic reactor 18 for hydrogen production.

[0029] In this embodiment, the Heat pump systems include Dehydration fluidized bed reactor 3 Hydrated fluidized bed reactor 4, first conveying assembly and second conveying assembly, the first conveying assembly being used to transport... The dewatering fluidized bed reactor 3 yielded the following results: Particles are transported to Within the hydrated fluidized bed reactor 4, the second conveying assembly is used to... The hydration obtained in the hydration fluidized bed reactor 4 Particles are transported to Inside the dewatering fluidized bed reactor 3. Both the first and second conveying components are screw conveyors. Specifically, the first conveying component is... Transmission screw 5, the second conveying assembly is Transmission screw 6. (Through) Transmission screw 5 will The particles obtained from dehydration in the dewatering fluidized bed reactor 3 are conveyed to Hydrated fluidized bed reactor 4, through Transmission screw 6 The hydrated particles obtained in the hydrated fluidized bed reactor 4 are transported to... 3. Dehydration fluidized bed reactor.

[0030] In this embodiment, the conveying areas of both the first and second conveying components exchange heat with the heat recovery device 7. The heat recovery device 7 can recover and reuse heat, further improving energy efficiency. The heat recovery device 7 adopts existing technology.

[0031] In operation, the coolant outlet of the thorium-based molten salt reactor 1 is connected to the high-temperature side inlet of the main heat exchanger 2. The high-temperature coolant from the outlet of the high-temperature gas-cooled reactor 1 enters the high-temperature side of the main heat exchanger 2 to heat the low-temperature side of the main heat exchanger 2, thus transferring heat. The low-temperature side of the main heat exchanger 2 is connected to the main heat exchanger 2 via pipes and heat transfer medium. The dehydration fluidized bed reactor 3, reheating device 10, preheater 11, and preheater 2 12 exchange heat; a portion of the heat transfer medium heated by the main heat exchanger 2 flows through pipes. Dehydration fluidized bed reactor 3, and After heat exchange in the dehydration fluidized bed reactor 3, the water flows directly back to the main heat exchanger 2; A dehydration reaction occurs in dehydration fluidized bed reactor 3, and the reaction formula is as follows: The other part of the heat transfer medium transfers heat to the reheating device 10, preheater 11 and preheater 2 12 for heat exchange. The working gas is fully heated to assist the dehydration and hydration reaction. After completing heat exchange in the reheating device 10, preheater 11 and preheater 2 12, this part of the heat transfer medium flows back to the main heat exchanger 2. After thermal decomposition in the dehydration fluidized bed reactor 3, the water vapor leaves with the working gas. The dehydration fluidized bed reactor 3 then enters the working gas fluidization process. In the transmission screw 5, it is then transmitted to Hydrated fluidized bed reactor 4; steam enters the reactor after being supplemented by water in steam generator 8 and heated by reheater 10. Hydrated fluidized bed reactor 4; water-rich working gas enters After the hydrated fluidized bed reactor 4, and A hydration reaction occurs within the hydrated fluidized bed reactor 4, and the reaction formula is as follows: At the same time, it releases a large amount of heat, which is beneficial to... Helium gas in the helium pipeline inside the hydrated fluidized bed reactor 4 is heated and then flows into the nickel catalytic reactor 18 through the pipeline for catalytic hydrogen production. After the hydration reaction occurs in the hydrated fluidized bed reactor 4, the fluidized bed formed by the working gas enters the working fluidized bed. In the transmission screw 6, the transport return The dehydration fluidized bed reactor 3; the relatively dry working gas flows through a pipe to the dryer 9 for further drying, and then is heated by the preheater 11 before returning to the reactor. The dehydration reaction is carried out in the dehydration fluidized bed reactor 3.

[0032] Helium in the helium pipeline The hydrated fluidized bed reactor 4 is heated and enters the nickel catalytic reactor 18, and the nickel catalytic reactor 18 is used for catalytic hydrogen production of hydrocarbons, and high-temperature helium provides a high-temperature condition environment for the nickel catalytic reaction; the reaction is The nickel catalytic reactor 18 is connected with a hydrogen pipeline, an oxygen pipeline and a medium-temperature helium pipeline; the hydrogen produced by the nickel catalytic reforming is discharged through the hydrogen pipeline, so that the hydrogen production is realized; after the high-temperature helium releases heat through the nickel catalytic reactor 18, the medium-temperature helium is obtained; and the medium-temperature helium is circulated into the Hydrated fluidized bed reactor 4 through the medium-temperature helium circulating pump five 17.

[0033] The hydrocarbon hydrogen production system coupled with the heat pump of the thorium-based molten salt reactor provided by the application couples the thorium-based molten salt reactor 1 with the heat pump system, uses the coolant at the outlet of the thorium-based molten salt reactor 1 as a medium-temperature driving heat source of the heat pump through the main heat exchanger 2, and realizes the improvement of the heat quality of the medium-temperature heat source of the thorium-based molten salt reactor 1; compared with the traditional thorium-based molten salt reactor hydrogen production, the application provides a heating technology, breaks through the temperature limitation of the current hydrogen production and oxygen production technology, obtains higher hydrogen production and oxygen production efficiency, realizes nuclear power generation, realizes efficient conversion of nuclear energy, and improves the economic benefit of the thorium-based molten salt reactor.

[0034] In the above description, the sensors, controllers and control programs that may be involved are all prior art and are not described in detail.

[0035] The above disclosed embodiments of the application are only used to help explain the application. The embodiments do not describe all the details, nor limit the application to the specific embodiments described. According to the content of the specification, many modifications and changes can be made. The specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the application, so that those skilled in the art can well understand and utilize the application.

Claims

1. A hydrogen production system, characterized by, The application relates to a nickel catalytic reactor, which comprises the following: The main heat exchanger (2) is coupled with the thorium-based molten salt reactor (1) on the hot side and with The hydrolysis reaction area in the heat pump system is coupled with the hot side of the several secondary preheaters, and the The working cycle working gas of the heat pump system is coupled with the cold side of the several preheaters. a nickel catalyzed reactor (18), and Hydration reaction zone coupling in heat pump systems for catalytic hydrogen production after heat absorption.

2. The hydrogen production system of claim 1, wherein: A steam generator (8) is arranged on a first pipeline through which the working gas flows from the hydrolysis reaction area to the hydration reaction area; a dryer (9) is arranged on a second pipeline through which the working gas flows from the hydration reaction area to the hydrolysis reaction area.

3. The hydrogen production system of claim 2, wherein: A circulating pump four (16) is arranged on the first pipeline, and a circulating pump three (15) is arranged on the second pipeline.

4. The hydrogen production system of claim 2, wherein: The several secondary preheaters comprise a reheating device (10), a preheater one (11) and a preheater two (12), the cold side of the preheater two (12), the cold side of the reheating device (10) and the first pipeline are sequentially coupled, and the cold side of the preheater one (11) and the second pipeline are coupled.

5. The hydrogen production system of claim 4, wherein: The steam generator (8) is arranged between the cold side of the preheater two (12) and the cold side of the reheating device (10).

6. The hydrogen production system of claim 4, wherein: The gas in the second pipeline is dried by the dryer (9) and then coupled with the cold side of the preheater one (11).

7. The hydrogen production system of claim 1, wherein: The hydration reaction area is coupled with the nickel catalytic reactor (18) through a helium pipeline, and a circulating pump five (17) is arranged on the helium pipeline.

8. The hydrogen production system of any one of claims 1-7, wherein: The Heat pump systems include Dehydration fluidized bed reactor (3) Hydrated fluidized bed reactor (4), first conveying assembly and second conveying assembly, the first conveying assembly being used to transport... The dehydration obtained in the dehydration fluidized bed reactor (3) Particles are transported to Within the hydrated fluidized bed reactor (4), the second conveying assembly is used to deliver... The hydrated fluidized bed reactor (4) obtained by hydration Particles are transported to Inside the dewatering fluidized bed reactor (3).

9. The hydrogen production system of claim 8, wherein: The conveying areas of the first conveying assembly and the second conveying assembly are both in heat exchange with a heat recovery device (7).

10. The hydrogen production system of claim 8, wherein: The first conveying assembly and the second conveying assembly are both screw rods.

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