JP2007063066A - Method and equipment for producing hydrogen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and equipment for producing hydrogen capable of efficiently utilizing the heat of steam extracted from a power plant and ensuring high safety. <P>SOLUTION: The equipment for producing hydrogen comprises: the power plant 1 which generates steam; and a hydrogen production plant 2 for producing hydrogen gas using the heat of steam extracted from the power plant 1, wherein the hydrogen production plant 2 comprises: a fuel supply system 11 in which hydrogen-containing fuel and water are heated by heat exchange with extracted steam; a mixed gas heat exchanger 12 in which fuel and water are mixed and heated with extracted steam to generate mixed gas; a reformer 10 in which the fuel in the mixed gas is steam-reformed using the heat of extracted steam to generate produced gas containing hydrogen gas; and a recovery system 13 for separating and recovering the hydrogen gas in the produced gas, wherein the fuel supply system 11, the mixed gas heat exchanger 12 and the reformer 10 are connected in parallel on pipelines 14a, 14b, 14c for supplying extracted steam. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hydrogen production method and apparatus for producing hydrogen gas from water and organic fuel using heat of water vapor obtained from a plant that generates water vapor such as a nuclear power plant.

In the recent electric power industry, diversification of fuel has been researched and developed to save energy in response to fossil fuel depletion or to preserve the environment due to increased concentrations of CO ₂ and NOx. There is hydrogen gas utilization technology. Examples of the hydrogen gas utilization technology include a fuel cell power generation system and a hydrogen combustion power plant. The former generates electric energy directly by an electrochemical reaction between a fuel such as hydrogen and an oxidant typified by oxygen. For example, the following Patent Document 1 discloses many inventions. In the latter case, high-pressure hydrogen gas and pure oxygen gas are burned to generate high-temperature water vapor, and the generated high-temperature water vapor is expanded by a turbine, and the generator is driven by the power generated at that time. Power generation is performed and, for example, many inventions such as the following Patent Document 2 are disclosed. The former, the latter both in NOx, in that they use a very clean energy that does not generate SOx, environmental pollutants and greenhouse gases such as CO _2, is attracting attention is the results of research and development as part of the new energy promotion policy in the 21st century ing.

Incidentally, it has been proposed that hydrogen supplied as fuel to a fuel cell power plant or a hydrogen combustion power plant is produced by electrolysis of water (see Patent Documents 3 and 4 below). In hydrogen production by electrolysis of water, most of the necessary cost is electric power. In current nuclear power plants and thermal power plants, only about 50% of fission energy exchanged for heat and fuel energy such as oil and natural gas is converted into electric power. In particular, the heat utilization efficiency in a nuclear power plant is about 30%. For this reason, in hydrogen production by electrolysis of water, energy utilization efficiency is extremely poor, leading to high costs. On the other hand, oxygen-containing hydrocarbons such as methanol and dimethyl ether are advantageous in terms of cost during hydrogen production because they can be steam reformed at low temperatures. In addition, methanol, dimethyl ether, ethanol, and the like are produced in a relatively large amount because they are produced from methane in small and medium gas fields, carbon dioxide gas, and gas fields with a high CO ₂ content. The invention of the following Patent Document 5 is invented by paying attention to such points.

The present invention is a hydrogen production system that combines a nuclear power plant and a hydrogen production plant, and steam-reforms oxygen-containing hydrocarbons using steam generated from the nuclear power plant to generate hydrogen gas. In this hydrogen production system, steam generated from a nuclear power plant is extracted, the fuel supplied from the hydrogen production plant is heat-exchanged or directly joined to the extracted steam, and the hydrogen contained in the fuel is subjected to steam reforming. To produce hydrogen gas.
JP-A-6-140065 Japanese Patent Laid-Open No. 11-36820 JP-A-6-93481 JP-A-6-93482 Japanese Patent Laid-Open No. 2003-248083

  The known technique described above has the following problems. That is, in the invention of Patent Document 5, there is a reformer that generates hydrogen by exchanging heat using the heat of steam extracted from a power plant as an important component of a hydrogen production plant. This reformer is desired to improve heat exchange efficiency in order to efficiently use the heat of extracted steam. Moreover, the thermal efficiency improvement by the further effective utilization of extraction water vapor | steam is desired. Furthermore, when using boiling water reactors among the power plants, the extracted steam is activated, and taking the extracted steam out of the nuclear power plant and using it in the hydrogen production plant is overly safe. become.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a highly safe hydrogen production method and apparatus that can efficiently use the heat of steam extracted from a power plant. And

  The invention of claim 1 includes a power plant that generates steam and a hydrogen production plant that generates hydrogen gas using heat of extracted steam from the power plant, and the hydrogen production plant is a fuel containing hydrogen. And a fuel supply apparatus that heats water by exchanging heat with the extracted steam, a mixed gas heat exchanger that mixes the fuel and water and heats the extracted steam to generate a mixed gas, and heat of the extracted steam The fuel supply device comprising: a reformer that uses steam reforming of the fuel in the mixed gas to generate a product gas containing hydrogen gas; and a recovery device that separates and recovers the hydrogen gas in the product gas The mixed gas heat exchanger and the reformer are connected in parallel on a pipe for supplying the extracted steam.

  The invention of claim 2 includes a power plant that generates steam and a hydrogen production plant that generates hydrogen gas using heat of extracted steam from the power plant, and the hydrogen production plant is a fuel containing hydrogen. And a fuel supply device for heating water, a mixed gas heat exchanger for mixing the fuel and water and heating with the extracted steam to generate a mixed gas, and using the heat of the extracted steam in the mixed gas A reformer that steam-reforms the fuel to produce a product gas containing hydrogen gas, and a recovery device that separates and recovers the hydrogen gas in the product gas. It is set as the structure which flowed to the said collection | recovery apparatus after utilizing for the heating of a fuel supply apparatus.

  The invention of claim 3 comprises a power generation plant that generates water vapor and a hydrogen production plant that generates hydrogen gas using the heat of extraction water vapor from the power generation plant, and the power generation plant is heated by the extraction water vapor. An intermediate heat exchanger for heating the medium fluid; and a circulator for circulating the heat medium fluid, wherein the hydrogen production plant heats fuel containing hydrogen and water by exchanging heat with the heat medium fluid for heating. An apparatus, a mixed gas heat exchanger that mixes the fuel and water and heats them with the heat medium fluid to generate a mixed gas, and steam reforms the fuel in the mixed gas using the heat of the heat medium fluid A reformer that produces a product gas containing hydrogen gas, and a recovery device that separates and recovers the hydrogen gas in the product gas, and the fuel supply device, the mixed gas heat exchanger, and the reformer include: in front A configuration that is connected in parallel on the pipe for supplying the heat medium fluid.

  The invention of claim 4 comprises a power plant that generates steam and a hydrogen production plant that generates hydrogen gas using heat of the extracted steam from the power plant, and the power plant is heated by the extracted steam. An intermediate heat exchanger that heats the medium fluid; and a circulator that circulates the heat medium fluid, wherein the hydrogen production plant mixes the fuel and water with a fuel supply device that heats the fuel and water containing hydrogen. And a mixed gas heat exchanger that generates a mixed gas by heating with the heat medium fluid, and a generated gas containing hydrogen gas by steam reforming the fuel in the mixed gas using heat of the heat medium fluid. A reformer that generates and a recovery device that separates and recovers the hydrogen gas in the product gas, and the generated gas that has exited from the reformer is used for heating the fuel supply device and then to the recovery device. A configuration with the configuration.

  The invention of claim 13 is a hydrogen production apparatus that generates hydrogen gas using the heat of water vapor extracted from water vapor generation means for generating water vapor, and a mixing means for mixing fuel containing hydrogen and water, Heating means for heating the mixed gas of water and fuel using the heat of the extracted steam, and hydrogen gas by steam reforming the fuel contained in the heated mixed gas using the heat of the extracted steam And a recovery means for separating and recovering the hydrogen gas in the product gas.

  The invention of claim 14 is a method of producing hydrogen gas by heating a heat medium fluid with steam extracted from a nuclear power plant, heating fuel and water with heat of the heat medium fluid, and steam reforming the fuel. .

  ADVANTAGE OF THE INVENTION According to this invention, the heat | fever of the water vapor extracted from the power plant can be utilized efficiently, and the highly safe hydrogen production method and apparatus can be provided.

Hereinafter, first to seventh embodiments of a hydrogen production apparatus according to the present invention will be described with reference to the drawings.
(First embodiment)
As shown in FIG. 1, the hydrogen production apparatus of the present embodiment connects a hydrogen production plant 2 to a nuclear power plant 1 and uses the steam heat energy of the nuclear power plant 1 to supply fuel from the hydrogen production plant 2. It is configured to generate hydrogen by steam reforming. The nuclear power plant 1 includes a reactor 3, a high pressure steam turbine 4, a low pressure steam turbine 5, a condenser 6, a feed water pump 7, and a generator directly connected to the rotary shafts of the high pressure steam turbine 4 and the low pressure steam turbine 5. 8 is provided. The nuclear reactor 3 is a fast breeder reactor or a pressurized water reactor.

  The reactor 3 and the high-pressure steam turbine 4 are connected by a main steam pipe 9, and high-temperature steam generated by heat exchange indirectly from the reactor 3 flows through the main steam pipe 9. The high-temperature steam is supplied to the high-pressure steam turbine 4 to perform expansion work, and the high-pressure steam turbine 4 is rotated. Then, the high-pressure steam is guided to the low-pressure steam turbine 5 and is also expanded here to rotate the low-pressure steam turbine 5. Since the generator 8 is directly connected to the rotary shafts of the high-pressure steam turbine 4 and the low-pressure steam turbine 5, the generator 8 is driven to generate power. The steam that has worked in the low-pressure steam turbine 5 is cooled by the condenser 6 to become condensed water, and is returned to the reactor 3 by the feed water pump 7.

  The hydrogen production plant 2 exchanges heat between the reformer 10, the fuel supply device 11 that supplies fuel and water, and the mixed gas supplied from the fuel supply device 11 with the extracted steam from the nuclear power plant 1. A mixed gas heat exchanger 12 and a recovery device 13 for purifying a generated gas containing hydrogen gas from the reformer 10 to separate and recover the hydrogen gas are provided. Further, the fuel supply device 11 is provided in parallel with the reformer 10 and the mixed gas heat exchanger 12, and the main steam extraction pipe 14 branched from the main steam pipe 9 branches into three main steam extraction branch pipes 14a, 14b and 14c are connected in parallel. The steam extracted from the nuclear power plant 1 is used for heat exchange in the reformer 10, heat exchange in the mixed gas heat exchanger 12, and heat exchange in the fuel supply device 11. The steam used for these heat exchanges merges through the return pipe branch pipes 15a, 15b, 15c, and is collected in the condenser 6 through the return pipe 15 connected to the condenser 6 of the nuclear power plant 1. Is done.

  The fuel supply device 11 includes a fuel preheater 16 and a steam generation device 17 that generates water vapor mixed with fuel. The fuel preheater 16 is connected to a fuel supply device 18 for supplying fuel, and steam. A water supply 19 for supplying water is connected to the generator 17. Although not shown, the fuel supply unit 18 is provided with, for example, a fuel tank, a pump, a pressure regulator, and the like, and the water supply unit 19 is provided with, for example, a water tank, a pump, and the like. The fuel preheater 16 is installed in the subsequent stage of the steam generator 17, a main steam extraction branch pipe 14 c is connected to the steam generator 17, and the main steam extraction branch pipe 14 d is connected between the steam generator 17 and the fuel preheater 16. Is connected.

  In the hydrogen production apparatus of the present embodiment configured as described above, the high-temperature steam branched and extracted from the nuclear power plant 1 passes through the main steam extraction pipe 14 to the reformer 10 from the main steam extraction branch pipe 14a. It flows from the main steam extraction branch pipe 14b to the mixed gas heat exchanger 12, from the main steam extraction branch pipe 14c to the steam generator 17, and then flows to the fuel preheater 16 through the main steam extraction branch pipe 14d. On the other hand, the fuel supplied from the fuel supplier 18, for example, an oxygen-containing hydrocarbon such as dimethyl ether, is preheated by the fuel preheater 16 by heat exchange with the main steam and flows to the mixed gas heat exchanger 12. The water supplied from is heated to steam by heat exchange with the main steam in the steam generator 17. These flow into the mixed gas heat exchanger 12, and the fuel and steam are mixed to form a mixed gas, which is further heated by heat exchange with the main steam in the mixed gas heat exchanger 12 and enters the reformer 10. Flowing.

The reformer 10 is filled with, for example, a Cu—Zn catalyst, and the mixed gas is heated by exchanging heat with the main steam. For example, when the fuel is dimethyl ether, the steam is converted into the following formula (1) by steam. A reforming reaction is performed to generate hydrogen gas.
CH ₃ OCH ₃ + 3H ₂ O → 6H ₂ + 2CO ₂ (1)
The hydrogen gas generated in this manner contains carbon dioxide and is separated and recovered by the recovery device 13.

  The high temperature steam used for heat exchange from the reformer 10, the mixed gas heat exchanger 12, and the steam generator 17 to the fuel preheater 16 passes through the return pipe branches 15 a, 15 b, 15 c and the return pipe 15. The main steam that has been returned to the nuclear power plant 1 and exited from the low-pressure steam turbine 5 is merged and converted into condensed water by the condenser 6 and returned to the reactor 3. The main steam extraction pipe 14 and the branch pipes 14a, 14b, 14c are each provided with a control valve (not shown), and the main steam flow rate is adjusted according to the heat load. Moreover, in the system | strain of the main steam extraction pipe | tube 14, when the temperature required for reaction production is insufficient at the time of detailed system examination, you may install the heater which supplements a shortage.

  According to the present embodiment, the heat energy of the steam generated from the nuclear power plant 1 can be used for the reformer 10, the mixed gas heat exchanger 12 and the fuel supply device 11 of the hydrogen production plant 2, which is necessary for hydrogen production. Most energy can be used effectively. Moreover, since it is returned again to the nuclear power plant 1 after use, it can be used effectively without waste, and an energy efficient hydrogen production apparatus can be provided. In the present embodiment, the nuclear power plant 1 including a fast breeder reactor or a pressurized water reactor may be replaced with a thermal power plant.

(Second Embodiment)
Next, a second embodiment of the hydrogen production apparatus according to the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the structure same as 1st Embodiment, and the overlapping description is abbreviate | omitted.
The hydrogen production apparatus of the present embodiment connects a hydrogen production plant 2a to the nuclear power plant 1, and uses the steam thermal energy of the nuclear power plant 1 to steam reform the fuel from the hydrogen production plant 2a to produce hydrogen. It is configured to generate. The configuration of the nuclear power plant 1 is the same as that of the first embodiment.

  The hydrogen production plant 2a includes a reformer 10, a fuel supply device 11 that supplies fuel and water, and a mixed gas heat exchanger 12 that exchanges heat of the mixed gas of fuel and water supplied from the fuel supply device 11 with steam. And a recovery device 13 that purifies the produced gas containing the hydrogen gas that has exited from the reformer 10 and separates and recovers the hydrogen gas. The reformer 10 and the mixed gas heat exchanger 12 are provided in parallel, the main steam extraction pipe 14 branched from the main steam pipe 9 of the nuclear power plant 1 is branched into two, and main steam extraction branch pipes 14a and 14b are provided. The steam that is connected in parallel and extracted from the nuclear power plant 1 is used for heat exchange of the reformer 10 and heat exchange of the mixed gas heat exchanger 12. The steam used for the heat exchange merges through the return pipe branch pipes 15a and 15b, and is recovered by the condenser 6 through the return pipe 15 connected to the condenser 6 of the nuclear power plant 1. It is a configuration.

  The fuel supply device 11 includes a fuel preheater 16 and a steam generation device 17 that generates water vapor mixed with fuel. The fuel preheater 16 is connected to a fuel supply device 18 for supplying fuel, and steam. A water supply 19 for supplying water is connected to the generator 17. Although not shown, the fuel supply unit 18 is provided with, for example, a fuel tank, a pump, a pressure regulator, and the like, and the water supply unit 19 is provided with, for example, a water tank, a pump, and the like. The fuel preheater 16 is installed downstream of the steam generator 17, and the recovery device 13 is installed downstream of the fuel preheater 16.

  The product gas generated by the reformer 10 passes through the product gas recovery pipe 20a connected between the reformer 10 and the steam generator 17 and exchanges heat with the steam generator 17, and then the steam generator 17 and the fuel. Heat is exchanged in the fuel preheater 16 through the product gas recovery pipe 20b connected between the preheaters 16, and the heat flows to the recovery device 13 through the product gas recovery pipe 20c.

  In the hydrogen production apparatus of the present embodiment configured as described above, high-temperature steam branched and extracted from the nuclear power plant 1 flows from the main steam extraction branch pipe 14a to the reformer 10 through the main steam extraction pipe 14. And flows from the main steam extraction branch pipe 14 b to the mixed gas heat exchanger 12. On the other hand, the fuel supplied from the fuel supplier 18, for example, an oxygen-containing hydrocarbon such as dimethyl ether, is preheated by heat exchange with the product gas generated in the reformer 10 in the fuel preheater 16 and is mixed with the mixed gas heat exchanger 12. The water supplied from the water supplier 19 is heated by heat exchange with the product gas in the steam generator 17 to become water vapor and flows to the mixed gas heat exchanger 12. The mixed gas heat exchanger 12 mixes fuel and water vapor to form a mixed gas, which is heated by heat exchange with the main vapor and flows into the reformer 10. The reformer 10 is filled with, for example, a Cu—Zn catalyst, and the mixed gas is heated by exchanging heat with the main steam. For example, when the fuel is dimethyl ether, the reforming reaction of the above formula (1) is performed by steam. To generate hydrogen gas.

  The hydrogen gas generated in this manner contains carbon dioxide and is separated and recovered by the recovery device 13. However, the generated hydrogen gas does not go directly to the recovery device 13 but is used for heat exchange of the steam generator 17 through the generated gas recovery tube 20a, and then passes through the generated gas recovery tube 20b to the fuel preheater 16. After being used for heat exchange, it enters the recovery device 13 through the product gas recovery pipe 20c.

  The high-temperature steam used for heat exchange between the reformer 10 and the mixed gas heat exchanger 12 is returned to the nuclear power plant 1 through the return pipe branch pipes 15 a and 15 b and the return pipe 15, and exits the low-pressure steam turbine 5. The main steam is combined with the main steam, and the condensed water is returned to the reactor 3 by the condenser 6. The main steam extraction pipe 14 and the branch pipes 14a and 14b are each provided with a control valve (not shown), and the main steam flow rate is adjusted in accordance with the heat load. Moreover, in the system | strain of the main steam extraction pipe | tube 14, when the temperature required for reaction production is insufficient at the time of detailed system examination, you may install the heater which supplements a shortage.

  According to the present embodiment, the thermal energy of steam generated from the nuclear power plant 1 can be used for the reformer 10 and the mixed gas heat exchanger 12 of the hydrogen production plant 2a, and the generated gas generated by the reforming reaction can be used. Since the surplus heat energy can be used for heat exchange of the fuel supply device 11, most of the energy required for hydrogen production can be effectively utilized, and after the heat of steam is used, it is returned to the power plant 1 again and effectively without waste. It is possible to provide a hydrogen production apparatus with high energy efficiency, such as being able to use and reducing the energy for cooling the surplus thermal energy of the product gas by the recovery device 13. In the present embodiment, the nuclear power plant 1 such as a fast breeder reactor or a pressurized water reactor may be replaced with a thermal power plant.

(Third embodiment)
A third embodiment of the present invention will be described with reference to FIG. The hydrogen production apparatus of the present embodiment connects a hydrogen production plant 2b via an intermediate heat exchanger 21 provided in the nuclear power plant 1a, and heats the intermediate heat exchanger 21 using steam from the nuclear power plant 1a. It is configured to generate hydrogen by steam reforming the fuel from the hydrogen production plant 2b using the heat energy of the exchanged heat medium fluid, for example, a heat medium fluid such as helium gas.

  The nuclear power plant 1a includes a nuclear reactor 3, a high-pressure steam turbine 4, a low-pressure steam turbine 5, a condenser 6, a feed water pump 7, and power generation directly connected to the rotary shafts of the high-pressure steam turbine 4 and the low-pressure steam turbine 5. A machine 8 is provided. The reactor 3 is a boiling water reactor. The functions and operations of these devices are the same as those in the first embodiment.

  Further, the nuclear power plant 1a includes an intermediate heat exchanger 21 and a heat medium fluid circulator 22 (circulator). The circulator 22 includes a turbine 22a and an impeller 22b directly connected to the turbine 22a. Further, the circulation machine 22 is provided with components necessary for normal functions such as a casing, a shaft seal device, and a bearing device (not shown), and FIG. 3 is schematically simplified. A main steam extraction pipe 14 branched from the main steam pipe 9 is connected to the intermediate heat exchanger 21, and a part of the main steam is extracted and flows into the intermediate heat exchanger 21, and passes through the extracted main steam and the inside. The heat exchange is performed with the heat medium fluid.

  The main steam exchanged in the intermediate heat exchanger 21 flows into the turbine 22a of the circulator 22 and rotates the turbine 22a. Then, the main steam returns to the inlet of the condenser 6 through the return pipe 15 and works in the low-pressure steam turbine 5. It is configured to merge with the main steam that has finished. The intermediate heat exchanger 21, the circulation device 22, and the hydrogen production plant 2b are connected to heat medium fluid pipes 23, 24, and 25 to form a closed loop. In these heat medium fluid pipes, the heat medium fluid is sealed and circulated by the circulator 22.

  The hydrogen production plant 2 b includes a reformer 10, a fuel supply device 11, a mixed gas heat exchanger 12 that exchanges heat of a mixed gas of fuel and water supplied from the fuel supply device 11 with a heat medium fluid, and reforming. A recovery device 13 is provided for purifying a product gas containing hydrogen gas discharged from the vessel 10 to separate and recover the hydrogen gas. The fuel supply device 11 is provided in parallel with the reformer 10 and the mixed gas heat exchanger 12, and the heat medium fluid pipe 24 is branched into three and the heat medium fluid pipes 24a, 24b, and 24c are connected in parallel. .

  The heat medium fluid heated by heat exchange in the intermediate heat exchanger 21 is used for heat exchange in the reformer 10, heat exchange in the mixed gas heat exchanger 12, and heat exchange in the fuel supply device 11. It has become. The heat medium fluids used for these heat exchanges merge through the heat medium fluid pipes 25a, 25b, and 25c, and are sucked into the impeller 22b of the circulator 22 through the heat medium fluid pipes 25, where they are added. In this configuration, the pressure is discharged and flows from the heat medium fluid pipe 23 to the intermediate heat exchanger 21 to circulate.

  The fuel supply device 11 includes a fuel preheater 16 and a steam generation device 17 that generates water vapor mixed with fuel. The fuel preheater 16 is connected to a fuel supply device 18 for supplying fuel, and steam. A water supply 19 for supplying water is connected to the generator 17. Although not shown, the fuel supply unit 18 is provided with, for example, a fuel tank, a pump, a pressure regulator, and the like, and the water supply unit 19 is provided with, for example, a water tank, a pump, and the like. The fuel preheater 16 is installed at the subsequent stage of the steam generator 17, a heat medium fluid pipe 24 c is connected to the steam generator 17, and a heat medium fluid pipe 24 d is connected between the steam generator 17 and the fuel preheater 16. Has been.

  In the hydrogen production apparatus of the present embodiment configured as described above, the high-temperature steam branched and extracted from the main steam pipe 9 of the nuclear power plant 1a flows to the intermediate heat exchanger 21 through the main steam extraction pipe 14, The heat medium fluid inside the intermediate heat exchanger 21 is heated by heat exchange, enters the turbine 22a of the circulator 22, and rotates the turbine 22a by expansion work. Thereafter, the steam that has exited the circulator 22 returns to the inlet of the condenser 6 through the return pipe 15, joins the main steam that has finished work in the low-pressure steam turbine 5, and is cooled by the condenser 6 to be condensed water. Thus, a cycle in which the feed water pump 7 returns the reactor 3 is formed. By storing, in the nuclear power plant 1a, equipment through which extracted main steam including radioactivity used for hydrogen production, such as the intermediate heat exchanger 21, the circulator 22, and the main steam extraction pipe 14 and the return pipe 15, flows. Since radiation protection measures can be provided at facilities installed in existing nuclear power plants, no special radiation protection measures for hydrogen production equipment are required.

  The impeller 22b directly connected by the rotation of the turbine 22a of the circulator 22 rotates and the heat medium fluid circulates in the closed loop. As the heat medium fluid circulates, the high-temperature heat medium fluid heated by heat exchange with the main steam extracted from the main steam pipe 9 by the intermediate heat exchanger 21 passes through the heat medium fluid pipe 24 to the hydrogen production plant 2b. Flowing. Branching in the hydrogen production plant 2b flows from the heat medium fluid pipe 24a to the reformer 10, flows from the heat medium fluid pipe 24b to the mixed gas heat exchanger 12, and flows from the heat medium fluid pipe 24c to the steam generator 17. It flows to the fuel preheater 16 through the pipe 24d.

  The fuel supplied from the fuel supplier 18, for example, an oxygenated hydrocarbon such as dimethyl ether, is preheated by exchanging heat with the heat medium fluid in the fuel preheater 16, flows to the mixed gas heat exchanger 12, and is supplied from the water supplier 19. The water thus generated is heated by exchanging heat with the heat medium fluid in the steam generator 17 to become steam, and flows to the mixed gas heat exchanger 12. The fuel and water vapor are mixed to form a mixed gas, which is heated by heat exchange with the heat medium fluid in the mixed gas heat exchanger 12 and flows into the reformer 10.

  The reformer 10 is filled with, for example, a Cu—Zn catalyst, and the mixed gas is heated by exchanging heat with the heat medium fluid. For example, when the fuel is dimethyl ether, the reforming reaction of the above formula (1) is performed by steam. To generate hydrogen gas. Since the generated hydrogen gas contains carbon dioxide, the hydrogen gas is separated and recovered by the recovery device 13.

  As described above, the hydrogen production apparatus of the present embodiment uses the high-temperature steam branched and extracted from the nuclear power plant 1a as a power source to drive the heat medium fluid circulator 22 so that the heat medium fluid flows, and the intermediate heat The heat medium fluid is heated by heat exchange with the high-temperature steam extracted by branching from the main steam pipe 9 by the exchanger 21, and the fuel preheater from the reformer 10, the mixed gas heat exchanger 12, and the steam generator 17. 16 is used for heat exchange to form a circulation flow returning to the circulator 22 through the heat medium fluid pipe 25. The heat medium fluid pipes 24a, 24b, and 24c are provided with control valves (not shown), respectively, so that the heat medium fluid flow rate is adjusted according to the heat load. Furthermore, a control valve is also installed in the main steam extraction pipe 14, and the main steam extraction flow rate is adjusted according to the load. Further, in the system of the heat medium fluid piping, when the temperature necessary for reaction generation is insufficient at the time of detailed system study, a heater that compensates for the shortage may be installed.

  According to the present embodiment, even when the nuclear power plant 1a reactor is a boiling water reactor, the heat energy of the steam generated from the nuclear reactor 3 is heated to the heat medium fluid via the intermediate heat exchanger 21. Since it can be used for the reformer 10, the mixed gas heat exchanger 12 and the fuel supply device 11 of the hydrogen production plant 2 b, the activated water vapor does not flow to the hydrogen production plant 2 b side, and the hydrogen production plant 2 b It is possible to provide a safe hydrogen production apparatus that does not require radiation protection measures. Furthermore, since the main steam generated from the nuclear reactor 3 can be used to drive the circulating fluid 22 of the heat medium fluid, most of the necessary energy can be effectively utilized. Further, since the extracted main steam used is returned to the power plant again, it can be used effectively without waste, and a hydrogen production apparatus with high energy efficiency can be provided.

(Fourth embodiment)
A fourth embodiment of the present invention will be described with reference to FIG. The hydrogen production apparatus of the present embodiment connects a hydrogen production plant 2b via an intermediate heat exchanger 21 provided in the nuclear power plant 1b, and heats the intermediate heat exchanger 21 using steam from the nuclear power plant 1b. It is configured to generate hydrogen by steam reforming the fuel from the hydrogen production plant 2b using the heat energy of the exchanged heat medium fluid, for example, a heat medium fluid such as helium gas.

  The nuclear power plant 1b includes a reactor 3, a high-pressure steam turbine 4, a low-pressure steam turbine 5, a condenser 6, a feed water pump 7, and a generator directly connected to the rotary shafts of the high-pressure steam turbine 4 and the low-pressure steam turbine 5. 8 is provided. The reactor 3 is a boiling water reactor. The functions and operations of these devices are the same as those in the first embodiment. Further, the nuclear power plant 1b is provided with an intermediate heat exchanger 21 and a heat medium fluid circulator 22. The impeller of the circulation machine 22 is directly connected to the rotating shaft of the generator 8. The circulator 22 is provided with components necessary for normal functions such as a casing, a shaft seal device, and a bearing device (not shown), and FIG. 4 is schematically simplified.

  The intermediate heat exchanger 21 is connected to the main steam extraction pipe 14 branched from the main steam pipe 9, and a part of the main steam is extracted and flows into the intermediate heat exchanger 21, and the extracted main steam and the heat passing through the inside are extracted. In this configuration, heat is exchanged with the medium fluid. The extracted main steam exchanged by the intermediate heat exchanger 21 returns to the inlet of the condenser 6 through the return pipe 15 and joins the main steam that has finished work in the low-pressure steam turbine 5. The circulation device 22, the intermediate heat exchanger 21, and the hydrogen production plant 2b are connected to heat medium fluid pipes 23, 24, and 25 to form a closed loop. A heat medium fluid is enclosed in these heat medium fluid pipes, and is circulated by a circulator 22.

  The hydrogen production plant 2 b includes a reformer 10, a fuel supply device 11, a mixed gas heat exchanger 12 that exchanges heat of the mixed gas supplied from the fuel supply device 11 with the heat medium fluid, and an output from the reformer 10. And a recovery device 13 for purifying the produced gas containing hydrogen gas and separating and recovering the hydrogen gas. Further, the fuel supply device 11 is provided in parallel with the reformer 10 and the mixed gas heat exchanger 12, and the heat medium fluid pipe 24 branches into three and the heat medium fluid pipes 24a, 24b, and 24c are connected in parallel. is doing. The heat medium fluid heated by heat exchange in the intermediate heat exchanger 21 is configured to be used for heat exchange of the reformer 10, heat exchange of the mixed gas heat exchanger 12, and heat exchange of the fuel supply device 11. . The heat medium fluids used for these heat exchanges merge through the heat medium fluid pipes 25a, 25b, and 25c, and are sucked into the circulator 22 through the heat medium fluid pipes 25, where they are pressurized and discharged. Thus, the heat medium fluid pipe 23 is circulated from the heat medium fluid pipe 23 to the intermediate heat exchanger 21.

  The fuel supply device 11 includes a fuel preheater 16 and a steam generation device 17 that generates water vapor mixed with fuel. The fuel preheater 16 is connected to a fuel supply device 18 for supplying fuel, and steam. A water supply 19 for supplying water is connected to the generator 17. Although not shown, the fuel supply unit 18 is provided with, for example, a fuel tank, a pump, a pressure regulator, and the like, and the water supply unit 19 is provided with, for example, a water tank, a pump, and the like. The fuel preheater 16 is installed at the rear stage of the steam generator 17, the heat generator fluid pipe 24 c is connected to the steam generator 17, and the heat medium fluid pipe 24 d is connected between the steam generator 17 and the fuel preheater 16. Yes.

  In the hydrogen production apparatus of the present embodiment configured as described above, the impeller of the heat medium fluid circulator 22 is attached to the rotating shaft of the generator 8 that is extracted from the reactor 3 and rotated by the expansion work of the main steam. Since it is directly connected, the circulator 22 is automatically driven to circulate the heat medium fluid in the closed loop.

  The high-temperature steam branched and extracted from the main steam pipe 9 of the nuclear power plant 1b flows through the main steam extraction pipe 14 to the intermediate heat exchanger 21, and heats the heat medium fluid flowing inside by heat exchange, and then returns the pipe 15 And then returns to the inlet of the condenser 6, merges with the main steam that has finished work in the low-pressure steam turbine 5, is cooled by the condenser 6, becomes condensed water, and is returned to the reactor 3 by the feed water pump 7. A cycle is formed. By storing in the nuclear power plant 1b equipment and piping through which extracted main steam including radioactivity used for hydrogen production, such as the intermediate heat exchanger 21, main steam extraction pipe 14, and return pipe 15, flows. Since the protective measures can be provided at the facilities at existing nuclear power plants, no special radiation protection measures for hydrogen production equipment are required.

  The circulator 22 directly connected to the rotating shaft of the generator 8 is driven and the heat medium fluid circulates in the closed loop, but the heat medium fluid circulates and is extracted from the main steam pipe 9 by the intermediate heat exchanger 21. A high-temperature heat medium fluid heated by heat exchange by the main steam flows through the heat medium fluid pipe 24 to the hydrogen production plant 2b. Branching in the hydrogen production plant 2b flows from the heat medium fluid pipe 24a to the reformer 10, flows from the heat medium fluid pipe 24b to the mixed gas heat exchanger 12, and flows from the heat medium fluid pipe 24c to the steam generator 17. It flows to the fuel preheater 16 through the pipe 24d.

  The fuel supplied from the fuel supplier 18, for example, an oxygen-containing hydrocarbon such as dimethyl ether, is preheated by the fuel preheater 16 by heat exchange with the heat medium fluid, flows to the mixed gas heat exchanger 12, and is supplied from the water supplier 19. The water thus produced is heated by heat exchange with the heat medium fluid in the steam generator 17 to become water vapor and flows to the mixed gas heat exchanger 12. The fuel and water vapor are mixed to form a mixed gas, which is heated by heat exchange with the heat medium fluid in the mixed gas heat exchanger 12 and flows into the reformer 10.

  The reformer 10 is filled with, for example, a Cu—Zn catalyst, and the mixed gas is heated by exchanging heat with the heat medium fluid. For example, when the fuel is dimethyl ether, the reforming reaction of the above formula (1) is performed by steam. To generate hydrogen gas. Since the generated hydrogen gas contains carbon dioxide, it is separated by the recovery device 13 to recover the hydrogen gas.

  As described above, in the hydrogen production apparatus of the present embodiment, the heat medium fluid circulator 22 directly connected to the rotating shaft of the generator 8 is automatically driven as the power plant operates, and the heat medium fluid flows. The intermediate heat exchanger 21 is heated by heat exchange with the high-temperature steam branched and extracted from the main steam pipe 9, and the reformer 10, the mixed gas heat exchanger 12, and the steam generator 17 to the fuel preheater 16 are heated. Is used for heat exchange, and a circulation flow is formed that returns to the circulation machine 22 through the heat medium fluid pipe 25. The heat medium fluid pipes 24a, 24b, and 24c are provided with control valves (not shown), respectively, so that the heat medium fluid flow rate is adjusted according to the heat load. Furthermore, a control valve is also installed in the main steam extraction pipe 14, and the main steam extraction flow rate is adjusted according to the load. Further, in the system of the heat medium fluid piping, when the temperature necessary for reaction generation is insufficient at the time of detailed system study, a heater that compensates for the shortage may be installed.

  According to the present embodiment, even when the nuclear reactor 3 of the nuclear power plant 1b is a boiling water reactor, the heat energy of the steam generated from the nuclear reactor 3 is converted into the heat medium fluid via the intermediate heat exchanger 21. Heat exchange can be used for the reformer 10, the mixed gas heat exchanger 12 and the fuel supply device 11 of the hydrogen production plant 2 b, so that the activated water vapor does not flow to the hydrogen production plant 2 b side, and the hydrogen production plant A safe hydrogen production apparatus that does not require radiation protection measures on the 2b side can be provided. Furthermore, since the rotational force of the high-pressure steam turbine 4, the low-pressure steam turbine 5, and the generator 8 can be used to drive the heat transfer medium circulator 22, most of the necessary energy can be effectively utilized. Furthermore, since the extracted main steam used for heat exchange is returned to the power plant again, it can be used effectively without waste, and a hydrogen production apparatus with high energy efficiency can be provided.

(Fifth embodiment)
A fifth embodiment of the present invention will be described with reference to FIG. The hydrogen production apparatus of the present embodiment connects a hydrogen production plant 2c via an intermediate heat exchanger 21 provided in the nuclear power plant 1a, and heats the intermediate heat exchanger 21 using steam from the nuclear power plant 1a. The hydrogen production plant 2c is configured to generate hydrogen by steam reforming the fuel using the heat energy of the exchanged heat medium fluid, for example, a heat medium fluid such as helium gas.

  The nuclear power plant 1 a includes a nuclear reactor 3, a high-pressure steam turbine 4, a low-pressure steam turbine 5, a condenser 6, a feed water pump 7, and a generator directly connected to the rotary shafts of the high-pressure steam turbine 4 and the low-pressure steam turbine 5. 8 is provided. The reactor 3 is a boiling water reactor. Furthermore, the nuclear power plant 1a is provided with an intermediate heat exchanger 21 and a heat medium fluid circulator 22. The circulator 22 includes a turbine 22a and an impeller 22b directly connected to the turbine 22a. The circulator 22 is provided with components necessary for normal functions such as a casing, a shaft seal device, and a bearing device (not shown), and FIG. 5 is schematically simplified.

  A main steam extraction pipe 14 branched from the main steam pipe 9 is connected to the intermediate heat exchanger 21, and a part of the main steam is extracted and flows into the intermediate heat exchanger 21, and passes through the extracted main steam and the inside. The heat exchange is performed with the heat medium fluid. The extracted main steam heat-exchanged in the intermediate heat exchanger 21 flows into the turbine 22a of the circulator 22 and rotates the turbine 22a, then returns to the inlet of the condenser 6 through the return pipe 15 and performs work in the low-pressure steam turbine 5. It is configured to merge with the finished main steam. The intermediate heat exchanger 21, the circulation machine 22, and the hydrogen production plant 2c are connected to heat medium fluid pipes 23, 24, and 25 to form a closed loop. A heat medium fluid is enclosed in these heat medium fluid pipes, and is circulated by a circulator 22.

  On the other hand, the hydrogen production plant 2c includes a reformer 10, a fuel supply device 11, a mixed gas heat exchanger 12 for exchanging heat of the mixed gas supplied from the fuel supply device 11 with water vapor, and an output from the reformer 10. And a recovery device 13 for purifying the produced gas containing hydrogen gas and separating and recovering the hydrogen gas. The reformer 10 and the mixed gas heat exchanger 12 are provided in parallel, branch from the heat medium fluid pipe 24 into two, and the heat medium fluid pipes 24a and 24b are connected in parallel. The heat medium fluid heated by heat exchange is used for heat exchange in the reformer 10 and heat exchange in the mixed gas heat exchanger 12. The heat medium fluid used for the heat exchange merges through the heat medium fluid pipes 25a and 25b, is sucked into the impeller 22b of the circulator 22 through the heat medium fluid pipe 25, and is pressurized there. And discharged from the heat medium fluid pipe 23 to the intermediate heat exchanger 21 for circulation.

  The fuel supply device 11 includes a fuel preheater 16 and a steam generation device 17 that generates water vapor mixed with fuel. The fuel preheater 16 is connected to a fuel supply device 18 for supplying fuel, and steam. A water supply 19 for supplying water is connected to the generator 17. Although not shown, the fuel supply unit 18 is provided with, for example, a fuel tank, a pump, a pressure regulator, and the like, and the water supply unit 19 is provided with, for example, a water tank, a pump, and the like. The fuel preheater 16 is installed downstream of the steam generator 17, and the recovery device 13 is installed downstream of the fuel preheater 16.

  The product gas generated in the reformer 10 passes through the product gas recovery pipe 20 a connected between the reformer 10 and the steam generator 17, exchanges heat with the steam generator 17, and then the steam generator 17 and fuel preheat. Heat is exchanged by the fuel preheater 16 through the product gas recovery pipe 20b connected between the containers 16, and flows to the recovery device 13 through the product gas recovery pipe 20c.

  In the hydrogen production apparatus of the present embodiment configured as described above, the high-temperature steam branched and extracted from the main steam pipe 9 of the nuclear power plant 1a flows to the intermediate heat exchanger 21 through the main steam extraction pipe 14, The heat medium fluid inside the intermediate heat exchanger 21 is heated by heat exchange, enters the turbine 22a of the circulator 22, and rotates the turbine 22a by expansion work. Thereafter, the steam that has exited the circulator 22 returns to the inlet of the condenser 6 through the return pipe 15, joins the main steam that has finished work in the low-pressure steam turbine 5, and is cooled by the condenser 6 to be condensed water. Then, a cycle of returning to the reactor 3 by the feed water pump 7 is performed. The intermediate heat exchanger 21, the circulation device 22, and the main steam extraction pipe 14 and the return pipe 15 are housed in the nuclear power plant 1a such as equipment through which the extracted main steam containing radioactivity used for hydrogen production flows. Therefore, special radiation protection measures for hydrogen production equipment are not required because radiation protection measures can be provided at facilities installed in existing nuclear power plants.

  The impeller 22b directly connected by the rotation of the turbine 22a of the circulator 22 rotates and the heat medium fluid circulates in the closed loop. As the heat medium fluid circulates, the high-temperature heat medium fluid heated by heat exchange with the main steam extracted from the main steam pipe 9 by the intermediate heat exchanger 21 passes through the heat medium fluid pipe 24 to the hydrogen production plant 2c. To flow. In the hydrogen production plant 2c, it branches and flows from the heat medium fluid pipe 24a to the reformer 10, and flows from the heat medium fluid pipe 24b to the mixed gas heat exchanger 12. The heat medium fluids exchanged by the reformer 10 and the mixed gas heat exchanger 12 merge through the heat medium fluid pipes 25a and 25b, respectively, and pass through the heat medium fluid pipe 25 to circulate in the nuclear power plant 1a. Form a circulating flow back to

  On the other hand, the fuel supplied from the fuel supplier 18, for example, an oxygen-containing hydrocarbon such as dimethyl ether, is preheated by heat exchange with the product gas in the fuel preheater 16 and flows to the mixed gas heat exchanger 12. The water supplied from is heated by heat exchange with the product gas in the steam generator 17 to become water vapor and flows to the mixed gas heat exchanger 12, where the fuel and water vapor are mixed to form a mixed gas and heat exchange of the mixed gas Heated by the heat exchange with the heat medium fluid in the vessel 12 and flows into the reformer 10. The reformer 10 is filled with, for example, a Cu—Zn catalyst, and the mixed gas is heated by exchanging heat with the heat medium fluid. For example, when the fuel is dimethyl ether, the reforming reaction of the above formula (1) is performed by steam. To generate hydrogen gas.

  The hydrogen gas generated in this manner contains carbon dioxide and is separated and recovered by the recovery device 13. However, the generated hydrogen gas does not go directly to the recovery device 13 but is used for heat exchange of the steam generator 17 through the generated gas recovery tube 20a, and then passes through the generated gas recovery tube 20b to the fuel preheater 16. After being used for heat exchange, it is recovered by the recovery device 13 through the product gas recovery pipe 20c. In addition, a control valve (not shown) is installed in each of the heat medium fluid pipes 24a and 24b, and the flow rate of the heat medium fluid is adjusted in accordance with the heat load. Furthermore, a control valve is also installed in the main steam extraction pipe 14, and the main steam extraction flow rate is adjusted according to the load. In addition, in the heat medium fluid piping system, when a temperature necessary for reaction generation is insufficient at the time of detailed system study, a heater that compensates for the shortage can be installed.

  According to the present embodiment, even when the nuclear reactor 3 of the nuclear power plant 1a is a boiling water reactor, the heat energy of the steam generated from the nuclear reactor 3 is converted into the heat medium fluid via the intermediate heat exchanger 21. Since heat exchange can be used for the reformer 10 and the mixed gas heat exchanger 12 of the hydrogen production plant 2c, the activated water vapor does not flow to the hydrogen production plant 2c side, and radiation protection is provided to the hydrogen production plant 2c side. It is possible to provide a safe hydrogen production apparatus that does not require a countermeasure. Furthermore, the main steam generated from the nuclear reactor 3 can be used for driving the heat transfer medium circulator 22, and the extracted main steam used can be returned to the power plant so that it can be used effectively without waste. The majority of energy can be used effectively. Furthermore, since the surplus thermal energy of the generated gas generated by the reforming reaction can be used for heat exchange of the fuel supply device 11, most of the energy required for hydrogen production can be effectively used, and the surplus thermal energy of the generated gas can be recovered. It is possible to provide an energy efficient hydrogen production apparatus such that the energy to be cooled in 13 can be reduced.

(Sixth embodiment)
A sixth embodiment of the present invention will be described with reference to FIG. The hydrogen production apparatus of the present embodiment connects a hydrogen production plant 2c via an intermediate heat exchanger 21 provided in the nuclear power plant 1b, and heats the intermediate heat exchanger 21 using steam from the nuclear power plant 1b. The hydrogen production plant 2c is configured to generate hydrogen by steam reforming the fuel using the heat energy of the exchanged heat medium fluid, for example, a heat medium fluid such as helium gas.

  The nuclear power plant 1b includes a reactor 3, a high-pressure steam turbine 4, a low-pressure steam turbine 5, a condenser 6, a feed water pump 7, and a generator directly connected to the rotary shafts of the high-pressure steam turbine 4 and the low-pressure steam turbine 5. 8 is provided. The reactor 3 is a boiling water reactor. Furthermore, the nuclear power plant 1b is provided with an intermediate heat exchanger 21 and a heat medium fluid circulator 22. The impeller of the circulation machine 22 is directly connected to the rotating shaft of the generator 8. The circulator 22 is provided with components necessary for normal functions such as a casing, a shaft seal device, and a bearing device (not shown), and FIG. 6 is schematically simplified.

  A main steam extraction pipe 14 branched from the main steam pipe 9 is connected to the intermediate heat exchanger 21, and a part of the main steam is extracted and flows into the intermediate heat exchanger 21, and passes through the extracted main steam and the inside. The heat exchange is performed with the heat medium fluid. The extracted main steam heat-exchanged by the intermediate heat exchanger 21 returns to the inlet of the condenser 6 through the return pipe 15 and joins the main steam that has finished work in the low-pressure steam turbine 5. The circulation device 22, the intermediate heat exchanger 21, and the hydrogen production plant 2c are connected to the heat medium fluid pipes 23, 24, and 25 to form a closed loop. In these heat medium fluid pipes, the heat medium fluid is sealed and circulated by the circulator 22.

  The hydrogen production plant 2 c includes a reformer 10, a fuel supply device 11, a mixed gas heat exchanger 12 that exchanges heat of the mixed gas supplied from the fuel supply device 11 with a heat medium fluid, and an output from the reformer 10. And a recovery device 13 for purifying the produced gas containing hydrogen gas and separating and recovering the hydrogen gas. The reformer 10 and the mixed gas heat exchanger 12 are provided in parallel, branch from the heat medium fluid pipe 24 into two, and the heat medium fluid pipes 24a and 24b are connected in parallel. The heat medium fluid heated by heat exchange is used for heat exchange in the reformer 10 and heat exchange in the mixed gas heat exchanger 12. The heat medium fluid used for the heat exchange merges through the heat medium fluid pipes 25a and 25b, and is sucked into the circulator 22 through the heat medium fluid pipe 25, where it is pressurized and discharged. It is configured to flow from the heat medium fluid pipe 23 to the intermediate heat exchanger 21 and circulate.

  The fuel supply device 11 includes a fuel preheater 16 and a steam generation device 17 that generates water vapor mixed with fuel. The fuel preheater 16 is connected to a fuel supply device 18 for supplying fuel, and steam. A water supply 19 for supplying water is connected to the generator 17. Although not shown, the fuel supply unit 18 is provided with, for example, a fuel tank, a pump, a pressure regulator, and the like, and the water supply unit 19 is provided with, for example, a water tank, a pump, and the like. The fuel preheater 16 is installed downstream of the steam generator 17, and the recovery device 13 is installed downstream of the fuel preheater 16.

  The product gas generated in the reformer 10 exchanges heat in the steam generator 17 through the generated gas recovery pipe 20a connected between the reformer 10 and the steam generator 17, and then the steam generator 17 and the fuel preheat. Heat is exchanged by the fuel preheater 16 through the product gas recovery pipe 20b connected between the containers 16, and flows to the recovery device 13 through the product gas recovery pipe 20c.

  In the hydrogen production apparatus of the present embodiment configured as described above, the impeller of the heat medium fluid circulator 22 is directly connected to the shaft of the generator 8 that is rotated by the expansion work of the main steam generated from the nuclear reactor 3. Therefore, as the generator 8 rotates, the circulator 22 is automatically driven to circulate the closed-loop heat transfer fluid.

  The high-temperature steam branched and extracted from the main steam pipe 9 of the nuclear power plant 1b flows to the intermediate heat exchanger 21 through the main steam extraction pipe 14, heats the internal heat medium fluid by heat exchange, and then returns to the return pipe 15 A cycle through which the main steam that has finished work in the low-pressure steam turbine 5 is merged with the main steam that has been completed by the low-pressure steam turbine 5, is cooled by the condenser 6, is condensed, and is returned to the reactor 3 by the feed water pump 7. Make. By storing in the nuclear power plant 1b equipment and piping through which extracted main steam including radioactivity used for hydrogen production, such as the intermediate heat exchanger 21, main steam extraction pipe 14, and return pipe 15, flows. Since protective measures can be provided at facilities installed in existing nuclear power plants, no special radiation protective measures for hydrogen production equipment are required.

  The circulating machine 22 directly connected to the rotating shaft of the generator 8 is driven to circulate the closed-loop heat medium fluid, but the heat medium fluid circulates and is extracted from the main steam pipe 9 by the intermediate heat exchanger 21. A high-temperature heat medium fluid heated by heat exchange with the main steam flows to the hydrogen production plant 2 c via the heat medium fluid pipe 24. The hydrogen production plant 2c branches and flows from the heat medium fluid pipe 24a to the reformer 10, and from the heat medium fluid pipe 24b to the mixed gas heat exchanger 12. The heat medium fluid heat-exchanged by the reformer 10 and the mixed gas heat exchanger 12 merges through the heat medium fluid pipes 25a and 25b, respectively, passes through the heat medium fluid pipe 25, and the circulator 22 in the nuclear power plant 1b. Return to.

  The fuel supplied from the fuel supplier 18, for example, an oxygen-containing hydrocarbon such as dimethyl ether, is preheated by heat exchange with the product gas in the fuel preheater 16, flows to the mixed gas heat exchanger 12, and is supplied from the water supplier 19. The water is heated by heat exchange with the product gas in the steam generator 17 to become steam and flows to the mixed gas heat exchanger 12, and the fuel and steam are mixed to become a mixed gas in the mixed gas heat exchanger 12. Heated by heat exchange with the heat transfer fluid and flows into the reformer 10.

  The reformer 10 is filled with, for example, a Cu—Zn catalyst, and the mixed gas is heated by exchanging heat with the heat medium fluid. For example, when the fuel is dimethyl ether, the reforming reaction of the above formula (1) is performed by steam. To generate hydrogen gas. The hydrogen gas generated in this manner contains carbon dioxide and is separated and recovered by the recovery device 13. However, the generated hydrogen gas does not go directly to the recovery device 13 but is used for heat exchange of the steam generator 17 through the generated gas recovery tube 20a, and then passes through the generated gas recovery tube 20b to the fuel preheater 16. After being used for heat exchange, it is recovered by the recovery device 13 through the product gas recovery pipe 20c.

  In addition, a control valve (not shown) is installed in each of the heat medium fluid pipes 24a and 24b, and the flow rate of the heat medium fluid is adjusted in accordance with the heat load. Furthermore, a control valve is also installed in the main steam extraction pipe 14, and the main steam extraction flow rate is adjusted according to the load. In addition, in the heat medium fluid piping system, when a temperature necessary for reaction generation is insufficient at the time of detailed system study, a heater that compensates for the shortage can be installed.

  According to the present embodiment, even when the nuclear reactor 3 of the nuclear power plant 1b is a boiling water reactor, the heat energy of the steam generated from the nuclear reactor 3 is converted into the heat medium fluid via the intermediate heat exchanger 21. Since heat exchange can be used for the reformer 10 and the mixed gas heat exchanger 12 of the hydrogen production plant 2c, the activated water vapor does not flow to the hydrogen production plant 2c side, and radiation protection measures are taken on the hydrogen production plant side 2c. It is possible to provide a safe hydrogen production apparatus that does not need to be used. Furthermore, since the rotational force of the high-pressure steam turbine 4, the low-pressure steam turbine 5, and the generator 8 can be used to drive the heat transfer medium circulator 22, most of the necessary energy can be effectively utilized. Furthermore, the extracted main steam used for heat exchange is returned to the power plant again, so that it can be used effectively without waste. Furthermore, since the surplus thermal energy of the generated gas generated by the reforming reaction can be used for heat exchange of the fuel supply device 11, most of the energy required for hydrogen production can be effectively used, and the surplus thermal energy of the generated gas can be recovered. It is possible to provide an energy efficient hydrogen production apparatus such that the energy to be cooled in 13 can be reduced.

(Seventh embodiment)
A seventh embodiment of the present invention will be described with reference to FIG. The present embodiment relates to an example of a preferable configuration of the reformer 10 provided in the hydrogen production apparatus according to the first to sixth embodiments. That is, as the reformer 10 in the first to sixth embodiments described above, a conventionally known configuration may be used, but the reformer of the present embodiment described below is applied. Is more preferred.

  The reformer 10 takes the form of a shell and tube type vertical heat exchanger. The inside of the shell 31 is divided into three chambers, a heated fluid chamber 31a, a mixed gas chamber 31b, and a generated gas chamber 31c by a tube plate 32 and a tube plate 33, and the upper and lower ends are sealed with a mirror plate. A bayonet type catalyst tube 34 having a double tube structure is accommodated therein. The catalyst tube 34 includes an outer tube 34a and an inner tube 34b. The outer tube 34 a is closed at the lower end, the upper end is opened and fixed to the tube plate 32, the inner tube 34 b is opened at both the upper and lower ends, and the upper end is fixed to the tube plate 33.

  In the heating fluid chamber 31a, the main steam extracted from the nuclear power plant 1 for heating the catalyst tube 34 or a heat medium heated by heat exchange in the intermediate heat exchanger 21 in the nuclear power plants 1a and 1b. A heated fluid inlet pipe 35 and a heated fluid outlet pipe 36 through which fluid enters and exits are provided, a mixed gas inlet pipe 37 is provided in the mixed gas chamber 31b, and a product gas generated by the reforming reaction is provided in the generated gas chamber 31c. A product gas outlet pipe 38 is provided.

  An annular gap formed between the outer tube 34 a and the inner tube 34 b of the catalyst tube 34 is filled with the catalyst 39. The catalyst packed bed has voids so that the mixed gas flows. In order to provide the non-catalyst filling portion 40 in the lower region of the annular gap of the catalyst tube 34, for example, a perforated receiving plate 41 is installed as a partition with holes such as meshes. Although not shown in the drawings, the heating fluid chamber 31a is provided with a baffle plate for improving heat exchange.

  In the reformer of the present embodiment thus formed, the heating fluid enters from the heating fluid inlet pipe 35 and exits from the heating fluid outlet pipe 36. During this time, heat is exchanged in the heating fluid chamber 31a. On the other hand, for example, a mixed gas of fuel such as dimethyl ether and water vapor enters from the mixed gas inlet pipe 37 and receives heat from the heating fluid as it flows through the voids of the packed bed of the catalyst 39. Thus, a reforming reaction is performed to generate hydrogen gas. The product gas makes a U-turn at the bottom of the catalyst tube 34, flows through the inner tube 34 b, collects in the product gas chamber 31 c, and exits from the product gas outlet tube 38.

  The inside of the catalyst layer is an endothermic reaction, and as the amount of heat increases, the reaction in the catalyst packed bed is promoted and the hydrogen generation efficiency is improved. Therefore, the product gas is reheated at this portion by providing the catalyst non-filling portion 40 at the lower portion of the catalyst tube 34. When the reheated product gas flows through the inner pipe 34b, heat exchange can be performed and heating can be performed from the inside of the catalyst layer, so that a large amount of heat can be given.

  According to the present embodiment, high-temperature steam extracted from a power plant or heating from the outside of the catalyst packed bed by a heating fluid consisting of a heat medium fluid heat-exchanged by an intermediate heat exchanger, and reheated product gas The heat exchange efficiency of the reformer is improved by heating from the inside of the catalyst packed bed by and a hydrogen production apparatus with high thermal efficiency can be provided. Although the reformer of the present embodiment is a vertical type, it can also be a horizontal type.

The figure which shows the structure of the hydrogen production apparatus of the 1st Embodiment of this invention, and the flow of a fluid. The figure which shows the structure and fluid flow of the hydrogen production apparatus of the 2nd Embodiment of this invention. The figure which shows the structure and fluid flow of the hydrogen production apparatus of the 3rd Embodiment of this invention. The figure which shows the structure and fluid flow of the hydrogen production apparatus of the 4th Embodiment of this invention. The figure which shows the structure and fluid flow of the hydrogen production apparatus of the 5th Embodiment of this invention. The figure which shows the structure and fluid flow of the hydrogen production apparatus of the 6th Embodiment of this invention. Sectional drawing which shows the structure of the reformer with which the hydrogen production apparatus of the 7th Embodiment of this invention is equipped.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1a, 1b ... Nuclear power plant, 2, 2a, 2b, 2c ... Hydrogen production plant, 3 ... Reactor, 4 ... High pressure steam turbine, 5 ... Low pressure steam turbine, 6 ... Condenser, 7 ... Feed water pump, DESCRIPTION OF SYMBOLS 8 ... Generator, 9 ... Main steam pipe, 10 ... Reformer, 11 ... Fuel supply apparatus, 12 ... Mixed gas heat exchanger, 13 ... Recovery apparatus, 14 ... Main steam extraction pipe, 14a, 14b, 14c, 14d DESCRIPTION OF SYMBOLS ... Main steam extraction branch pipe, 15 ... Return pipe, 15a, 15b, 15c ... Return pipe branch pipe, 16 ... Fuel preheater, 17 ... Steam generator, 18 ... Fuel supply device, 19 ... Water supply device, 20a, 20b , 20c ... Product gas recovery pipe, 21 ... Intermediate heat exchanger, 22 ... Circulator, 22a ... Turbine, 22b ... Impeller, 23, 24, 24a, 24b, 24c, 24d, 25, 25a, 25b, 25c ... Heat Medium fluid piping, 31 ... shell, 3 a ... heated fluid chamber, 31b ... mixed gas chamber, 31c ... generated gas chamber, 32, 33 ... tube plate, 34 ... catalyst tube, 34a ... outer tube, 34b ... inner tube, 35 ... heated fluid inlet tube, 36 ... heating Fluid outlet pipe, 37 ... mixed gas inlet pipe, 38 ... product gas outlet pipe, 39 ... catalyst, 40 ... catalyst unfilled part, 41 ... perforated backing plate.

Claims (14)

  A power generation plant that generates water vapor; and a hydrogen production plant that generates hydrogen gas by using heat of extracted water vapor from the power generation plant, wherein the hydrogen production plant uses hydrogen-containing fuel and water as the extracted water vapor. A fuel supply device that heats and heat-exchanges; a mixed gas heat exchanger that mixes the fuel and water and heats the extracted steam to generate a mixed gas; and the heat of the extracted steam in the mixed gas. The fuel supply device and the mixed gas heat exchanger are provided with a reformer that generates a product gas containing hydrogen gas by steam reforming the fuel of the fuel, and a recovery device that separates and recovers the hydrogen gas in the product gas And the reformer are connected in parallel on a pipe for supplying the extracted steam.   A power generation plant that generates water vapor; and a hydrogen production plant that generates hydrogen gas using heat of extracted steam from the power generation plant, wherein the hydrogen production plant supplies fuel containing hydrogen and fuel for heating water An apparatus, a mixed gas heat exchanger that mixes the fuel and water and heats the extracted steam to generate a mixed gas, and steam reforms the fuel in the mixed gas using the heat of the extracted steam. A reformer that generates a product gas containing hydrogen gas and a recovery device that separates and recovers the hydrogen gas in the product gas are provided, and the product gas output from the reformer is used for heating the fuel supply device After that, the hydrogen production apparatus is configured to flow to the recovery apparatus.   A power generation plant that generates water vapor; and a hydrogen production plant that generates hydrogen gas using heat of extracted steam from the power generation plant, wherein the power generation plant heats a heat medium fluid with the extracted steam. The hydrogen production plant includes a fuel supply device that heats fuel and water containing hydrogen by exchanging heat with the heat medium fluid, and the fuel and water. A mixed gas heat exchanger that mixes and heats with the heat medium fluid to generate a mixed gas, and generates hydrogen gas by reforming the fuel in the mixed gas with steam using the heat of the heat medium fluid A reformer that generates gas; and a recovery device that separates and recovers hydrogen gas in the generated gas. The fuel supply device, the mixed gas heat exchanger, and the reformer supply the heat medium fluid. Hydrogen production apparatus characterized by being connected in parallel on the pipe that.   A power generation plant that generates water vapor; and a hydrogen production plant that generates hydrogen gas using heat of extracted steam from the power generation plant, wherein the power generation plant heats a heat medium fluid with the extracted steam. The hydrogen production plant includes a fuel supply device that heats a fuel containing hydrogen and water, and the fuel and water are mixed and heated by the heat medium fluid. A mixed gas heat exchanger for generating a mixed gas, and a reformer for generating a generated gas containing hydrogen gas by steam reforming the fuel in the mixed gas using heat of the heat medium fluid; A recovery device that separates and recovers hydrogen gas in the product gas, and the product gas that has exited the reformer flows to the recovery device after being used for heating the fuel supply device. Hydrogen generating device according to claim.   The fuel supply device includes a fuel preheater that heats fuel by exchanging heat with the extracted steam, the heat medium fluid, or the generated gas; and a water preheater that exchanges heat with the extracted steam, the heat medium fluid, or the generated gas. The hydrogen production apparatus according to claim 1, further comprising: a steam generator that generates water.   6. The structure according to claim 5, wherein the extracted steam, the heat medium fluid, or the product gas is used for heat exchange in the fuel preheater after being used for heat exchange in the steam generator. The hydrogen production apparatus as described.   5. The hydrogen production apparatus according to claim 3, wherein the circulator includes a turbine driven by the extracted steam.   5. The hydrogen production apparatus according to claim 3, wherein the circulation machine is coupled to a high-pressure steam turbine, a low-pressure steam turbine, or a shaft of a generator provided in the power plant.   The hydrogen production apparatus according to claim 7, wherein the turbine is driven by extracted steam after being used for heat exchange in the intermediate heat exchanger.   The extraction steam used for heating the fuel supply apparatus, the extraction steam used for heating the mixed gas heat exchanger, and the extraction steam used for heating the reformer are recovered by the recovery steam provided in the power plant. The hydrogen production apparatus according to claim 1, wherein the hydrogen production apparatus is configured to be collected in a water vessel.   The extracted steam used for heat exchange in the intermediate heat exchanger and the extracted steam used for driving the circulator are collected in a condenser provided in the power plant. The hydrogen production apparatus according to claim 7.   The reformer includes a bayonet-type catalyst pipe having a double pipe structure having an outer pipe and an inner pipe, and has a catalyst filling portion in which a catalyst is filled in an annular gap between the outer pipe and the inner pipe. 5. The hydrogen production apparatus according to claim 1, further comprising a catalyst non-filling portion in a region where the product gas generated in the catalyst filling portion flows into the inner pipe from the annular gap.   A hydrogen production apparatus that generates hydrogen gas using the heat of water vapor extracted from water vapor generating means for generating water vapor, wherein the mixing means for mixing the fuel containing hydrogen and water and the heat of the extracted water vapor are used. Then, heating means for heating the mixed gas of fuel and water, and refinement of the product gas containing hydrogen gas by steam reforming the fuel contained in the heated mixed gas using the heat of the extracted steam A hydrogen production apparatus comprising reforming means and recovery means for separating and recovering hydrogen gas in the product gas. A method for producing hydrogen, comprising heating a heat medium fluid with steam extracted from a nuclear power plant, heating fuel and water with heat of the heat medium fluid, and steam reforming the fuel to produce hydrogen gas.

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