SOEC module and SOEC water electrolysis hydrogen production device based on multi-stack-core module

Abstract

An SOEC module and an SOEC water electrolysis hydrogen production device based on a multi-stack-core module. Said device comprises a steam generator, a mixer, an air heater and a plurality of SOEC modules; each SOEC module comprises a heat preservation shell provided with a hot air module inlet, a hydrogen-containing mixed steam module inlet, an oxygen-rich air module outlet and a product crude hydrogen module outlet, and a plurality of electrolytic cell stack cores arranged in the heat preservation shell; and each electrolytic cell stack core comprises a hot air single-stack inlet, a hydrogen-containing mixed steam single-stack inlet, an oxygen-rich air single-stack outlet and a product crude hydrogen single-stack outlet.

Description

SOEC module and SOEC water electrolysis hydrogen production device based on multi-core module

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Chinese patent application No. 202311031308.8 filed on August 16, 2023, the contents of which are incorporated herein by reference. Technical Field

[0003] The present invention relates to the technical field of water electrolysis hydrogen production, in particular to a SOEC module and a SOEC water electrolysis hydrogen production device based on a multi-core module. Background Art

[0004] There are three main methods of using renewable energy to generate hydrogen through water electrolysis: alkaline water electrolysis, proton exchange membrane water electrolysis, and solid oxide electrolysis cell (SOEC) water electrolysis.

[0005] SOEC water electrolysis hydrogen production technology is the mainstream water electrolysis hydrogen production technology in the future because of its high electrolysis efficiency (over 90%), and can be integrated with existing petrochemical equipment to efficiently utilize the abundant waste heat of petrochemical equipment, reduce the power consumption of SOEC equipment, and improve the overall efficiency of the system.

[0006] In the prior art, the skid-mounted method for SOEC water electrolysis hydrogen production based on multiple core modules is generally as follows: one SOEC electrolytic cell core and the corresponding heating furnace constitute a single stack, multiple single stacks constitute a SOEC module, and then multiple modules constitute a SOEC water electrolysis hydrogen production equipment; wherein, each SOEC electrolytic cell core is arranged in a corresponding electric furnace, so that the SOEC electrolytic cell core can be heated to the required temperature by heating with the heating wire of the electric furnace.

[0007] After research, the inventors found that the skid-mounted method of producing hydrogen by electrolysis of water using SOEC based on multiple core modules in the prior art still has at least the following defects:

[0008] The high-temperature heating elements of the electric furnace are easily damaged because they are always in a high-temperature state and have no good cooling effect, which in turn affects the operating stability of the SOEC water electrolysis hydrogen production equipment.

[0009] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0010] Summary of the Invention

[0011] The purpose of the present invention is to improve the operating stability of SOEC water electrolysis hydrogen production equipment.

[0012] The present invention provides a SOEC water electrolysis hydrogen production device based on a multi-core module, comprising:

[0013] A skid-mounted cabinet having a deionized ultrapure water inlet, a cathodic protection hydrogen inlet, a cold air inlet, a product crude hydrogen outlet, and an oxygen-enriched air outlet, and a steam generator, a mixer, an air heater, and multiple SOEC modules arranged in the skid-mounted cabinet;

[0014] The SOEC module includes a heat-insulating shell provided with a high-temperature air module inlet, a hydrogen-containing mixed steam module inlet, an oxygen-enriched air module outlet, and a product crude hydrogen module outlet, and a plurality of electrolytic cell cores arranged in the heat-insulating shell; the electrolytic cell cores include a high-temperature air single stack inlet, a hydrogen-containing mixed steam single stack inlet, an oxygen-enriched air single stack outlet, and a product crude hydrogen single stack outlet;

[0015] The mixer is used to mix the cathodic protection hydrogen and the steam generated by the steam generator into hydrogen-containing mixed steam; the hydrogen-containing mixed steam is transported to the hydrogen-containing mixed steam single stack inlet of each electrolytic cell core via the hydrogen-containing mixed steam module inlet; the air heater is used to heat the air from the cold air inlet into high-temperature air; the high-temperature air is transported to the high-temperature air single stack inlet of each electrolytic cell core via the high-temperature air module inlet.

[0016] Preferably, in the embodiment of the present invention, it further comprises:

[0017] The oxygen-enriched air generated by the electrolytic cell core is transported via the oxygen-enriched air single stack outlet through a pipe section to the oxygen-enriched air module outlet of the corresponding SOEC module; the product crude hydrogen generated by the electrolytic cell core is transported via the product crude hydrogen single stack outlet through a pipe section to the product crude hydrogen module outlet of the corresponding SOEC module.

[0018] Preferably, in an embodiment of the present invention, the pipeline connection structure in the skid-mounted cabinet includes:

[0019] A first pipe section of the steam generator is provided, the inlet end of which is connected to the deionized ultrapure water inlet, and the outlet end of which is connected to the inlet of the mixer;

[0020] A second pipe section having an inlet end connected to the cathodic protection hydrogen inlet and an outlet end connected to the inlet of the mixer;

[0021] A third pipe section having the steam electric heater is provided, wherein the inlet end thereof is connected to the outlet of the mixer, and the outlet end thereof is connected to the inlet of the hydrogen-containing mixed steam module of the first SOEC module in the SOEC modules;

[0022] The crude hydrogen product module outlet of the first SOEC module is connected to the air inlet of the ejector; the air outlet of the ejector is connected to the hydrogen-containing mixed steam module inlet of each second SOEC module;

[0023] A fourth pipe section of the air heater is provided, wherein the inlet end thereof is connected to the cold air inlet, and the outlet end thereof is respectively connected to the high temperature air module inlet of each of the SOEC modules;

[0024] The outlets of the oxygen-enriched air modules are connected to the inlet end of the fifth pipe segment, and the outlet end of the fifth pipe segment is connected to the oxygen-enriched air outlet;

[0025] The product crude hydrogen module outlet of each second SOEC module is connected to the inlet end of the sixth pipe section, and the outlet end of the sixth pipe section is connected to the product crude hydrogen outlet.

[0026] Preferably, in the embodiment of the present invention, a plurality of gas heat exchangers are further included, which are respectively arranged at:

[0027] The contact point between the sixth pipe segment and the first pipe segment, the contact point between the sixth pipe segment and the second pipe segment, and the contact point between the fourth pipe segment and the fifth pipe segment.

[0028] Preferably, in the embodiment of the present invention, the sixth pipe section is further provided with a bypass, which is respectively provided at:

[0029] Both sides of the contact point between the sixth pipe segment and the first pipe segment, and both sides of the contact point between the sixth pipe segment and the second pipe segment.

[0030] Preferably, in the embodiment of the present invention, the number of the SOEC modules is four;

[0031] The number of the first SOEC modules is one, and the number of the second SOEC modules is three.

[0032] Preferably, in an embodiment of the present invention, the nozzle inlet of the ejector is connected to the third pipe section.

[0033] Another aspect of the present invention further provides a SOEC module for a SOEC water electrolysis hydrogen production device, wherein the SOEC water electrolysis hydrogen production device includes the above-mentioned SOEC water electrolysis hydrogen production device based on a multi-core module, and the pipeline connection structure in the SOEC module includes:

[0034] A seventh pipe section whose inlet end is connected to the inlet of the hydrogen-containing mixed steam module and whose outlet end is respectively connected to the inlet of each hydrogen-containing mixed steam single stack;

[0035] The electrolytic cell cores are divided into multiple groups, each group includes multiple electrolytic cell cores connected in series, and the oxygen-enriched air single stack outlet of the first electrolytic cell core in the group is connected to the high-temperature air single stack inlet of the subsequent electrolytic cell core;

[0036] An eighth pipe section, the inlet of which is connected to the inlet of the high-temperature air module, and the outlet of which is connected to the high-temperature air single stack inlet of the first electrolytic cell core in each group;

[0037] A ninth pipe section, the outlet of which is connected to the outlet of the oxygen-enriched air module, and the inlet of which is connected to the outlet of the oxygen-enriched air single stack of the last electrolytic cell core in each group;

[0038] The tenth pipe section, the outlet of which is connected to the outlet of the product crude hydrogen module, has its inlet end connected to the outlet of each product crude hydrogen single stack respectively.

[0039] Another aspect of the present invention provides another SOEC module for a SOEC water electrolysis hydrogen production device, wherein the SOEC water electrolysis hydrogen production device includes the above-mentioned SOEC water electrolysis hydrogen production device based on a multi-core module, and the pipeline connection structure in the SOEC module includes:

[0040] A seventh pipe section whose inlet end is connected to the inlet of the hydrogen-containing mixed steam module and whose outlet end is respectively connected to the inlet of each hydrogen-containing mixed steam single stack;

[0041] an eighth pipe section whose inlet end is connected to the inlet of the high-temperature air module and whose outlet end is respectively connected to the inlet of each high-temperature air single stack;

[0042] a ninth pipe section whose inlet end is connected to the outlet of each oxygen-enriched air single stack, and whose outlet end is connected to the outlet of the oxygen-enriched air module;

[0043] The tenth pipe section has an inlet end connected to the outlet of each product crude hydrogen single stack, and an outlet end connected to the outlet of the product crude hydrogen module.

[0044] Preferably, in the embodiment of the present invention, it further comprises:

[0045] A backup bypass is provided between the high-temperature air single stack inlet and the oxygen-enriched air single stack outlet of the electrolytic cell core.

[0046] Preferably, in an embodiment of the present invention, the number of electrolytic cell cores in a single SOEC module is 2 to 10, and every two electrolytic cell cores form a group.

[0047] Compared with the prior art, the present invention has the following beneficial effects:

[0048] The SOEC water electrolysis hydrogen production device of the present invention is configured with pipelines so that one air heater can simultaneously perform temperature control for each electrolytic cell core in multiple SOEC modules. Since the multiple electrolytic cell cores in the SOEC module of the present invention are densely arranged in a thermal insulation shell, most of the heat energy radiated by the electrolytic cell cores in the thermal insulation shell is confined within the thermal insulation shell, thereby effectively reducing the ambient temperature in which the air heater operates. This effectively increases the service life of the electric heater and reduces the probability of failure of the electric heater. This further improves the operational stability of the SOEC water electrolysis hydrogen production device.

[0049] In addition, in the present invention, the multiple electrolytic cell cores in the SOEC module are densely arranged in the insulation shell. In this way, the temperature inside the insulation shell is the result of the combined action of the heat energy radiated by the electrolytic cell cores. Therefore, compared with the method of heating each electrolytic cell core separately, the present invention can also effectively improve the stability of the operating temperature of the electrolytic cell core; thereby further improving the operating stability of the SOEC water electrolysis hydrogen production equipment.

[0050] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and to implement it according to the contents of the specification, and to make the above and other purposes, technical features and advantages of the present invention easier to understand, one or more preferred embodiments are listed below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0052] FIG1 is a schematic structural diagram of the SOEC water electrolysis hydrogen production device of the present invention;

[0053] FIG2 is a schematic structural diagram of the SOEC module of the present invention;

[0054] FIG3 is another structural diagram of the SOEC module of the present invention. DETAILED DESCRIPTION

[0055] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0056] Unless expressly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising” will be understood to include the stated elements or components but not to exclude other elements or components.

[0057] In this document, the terms "first", "second", etc. are used to distinguish two different elements or parts, and are not used to limit specific positions or relative relationships. In other words, in some embodiments, the terms "first", "second", etc. can also be interchangeable with each other.

[0058] Example 1

[0059] In order to improve the operational stability of the SOEC water electrolysis hydrogen production equipment, referring to FIG1 and FIG2 , an embodiment of the present invention provides a SOEC water electrolysis hydrogen production device based on a multi-core module, comprising:

[0060] A skid-mounted cabinet 06 is provided with a water inlet 01, a cathodic protection hydrogen inlet 02, an air inlet 03, a product crude hydrogen outlet 04, and an oxygen-enriched air outlet 05, as well as a steam generator 07, a mixer 08, an air heater 09, and multiple SOEC modules 10 arranged in the skid-mounted cabinet 06;

[0061] The SOEC module 10 includes a heat-insulating shell 25 having a hot air module inlet 21, a hydrogen-containing mixed steam module inlet 22, an oxygen-enriched air module outlet 23, and a product crude hydrogen module outlet 24, and a plurality of electrolytic cell cores 26 disposed within the heat-insulating shell 25; the electrolytic cell cores 26 include a hot air single-stack inlet 31, a hydrogen-containing mixed steam single-stack inlet 32, an oxygen-enriched air single-stack outlet 33, and a product crude hydrogen single-stack outlet 34;

[0062] The mixer 08 is used to mix the cathodic protection hydrogen and the steam generated by the steam generator 07 into hydrogen-containing mixed steam; the hydrogen-containing mixed steam is transported to the hydrogen-containing mixed steam single stack inlet 32 ​​of each electrolytic cell core via the hydrogen-containing mixed steam module inlet 22; the air heater 09 is usually configured as an electric heater and is used to heat the air from the air inlet 03 into high-temperature air; the high-temperature air is transported to the hot air single stack inlet 31 of each electrolytic cell core via the hot air module inlet 21.

[0063] In which, water (such as deionized ultrapure water) can be introduced into the skid-mounted cabinet 06 through the water inlet 01, and can be heated by the steam generator 07 to generate steam; the cathodic protection hydrogen can be introduced into the skid-mounted cabinet 06 through the cathodic protection hydrogen inlet 02; the cathodic protection hydrogen and the steam are mixed through the mixer 08 to form hydrogen-containing mixed steam, and then transported to each SOEC module 10 through the hydrogen-containing mixed steam module inlet 22 to supply hydrogen-containing mixed steam to the hydrogen-containing mixed steam single stack inlet 32 ​​of the electrolytic cell core in the SOEC module 10.

[0064] Air enters the skid-mounted cabinet 06 through the air inlet 03 and is heated into hot air by the air heater 09. The hot air is then transported to each SOEC module 10 through the hot air module inlet 21 to supply hot air to the hot air single stack inlet 31 of the electrolytic cell core in the SOEC module 10.

[0065] In the present invention, each SOEC module 10 uses its insulating shell 25 to enclose multiple electrolytic cell cores 26 in an insulating space, and places the air heater 09 outside the insulating space. As a result, most of the heat energy radiated by each electrolytic cell core is confined within the insulating shell and can be used by other electrolytic cell cores. At the same time, the air heater 09 can be allowed to operate at a relatively low heating power, thereby ensuring the service life of the air heater 09 and the stability of the operating temperature of the electrolytic cell core.

[0066] The working principle of the embodiment of the present invention is described below using an example in which a skid-mounted cabinet includes four SOEC modules, each of which includes four electrolytic cell cores (referred to as cores in FIG2 ).

[0067] In this embodiment of the present invention, deionized ultrapure water enters skid-mounted cabinet 06 through water inlet 01 and passes through steam generator 07 (an electrically heated saturated steam generator) to form saturated steam. Furthermore, cathodic protection hydrogen enters skid-mounted cabinet 06 through cathodic protection hydrogen inlet 02 and is heated. The saturated steam and cathodic protection hydrogen are then uniformly mixed in mixer 08. The mixed hydrogen-containing steam is then delivered to the hydrogen-containing mixed steam single stack inlet 32 ​​of each electrolytic cell core via hydrogen-containing mixed steam module inlet 22.

[0068] Furthermore, air enters the skid-mounted cabinet 06 through the air inlet 03, is heated to high temperature by the air heater 09, and is then delivered to the hot air inlet 31 of each electrolytic cell core via the hot air module inlet 21. That is, in this embodiment of the present invention, an air heater 09 is provided for heating air. The heated high-temperature air enters each insulation shell 25 through multiple branch pipe sections, and is then further connected to the hot air inlet 31 of each electrolytic cell core 26 in the SOEC module 10 through branch pipe sections.

[0069] In an embodiment of the present invention, the multiple electrolytic cell cores in the SOEC module 10 are densely arranged in the insulation shell 25, and most of the heat energy radiated by each electrolytic cell core is confined to the insulation shell 25; and the air heater 09 is arranged outside the insulation shell 25, so it can effectively reduce the impact of the high temperature radiation of the electrolytic cell core on its ambient temperature.

[0070] It should be understood that the skid-mounted cabinet 06 is not essential for achieving the goal of producing hydrogen from water electrolysis and resolving the operational stability issues of the SOEC water electrolysis hydrogen production device. The present invention utilizes the skid-mounted cabinet 06 to integrate and arrange the various functional components of the SOEC water electrolysis hydrogen production device, thereby reducing the footprint and facilitating overall mobility.

[0071] Example 2

[0072] On the basis of the first embodiment, further, in the embodiment of the present invention, the following settings can be made for the oxygen-enriched air and the product crude hydrogen generated by each electrolytic cell core 26:

[0073] The oxygen-enriched air generated by the electrolytic cell core 26 is transported to the oxygen-enriched air module outlet 23 of the corresponding SOEC module 10 through the pipe section via the oxygen-enriched air single stack outlet 33; the product crude hydrogen generated by the electrolytic cell core 26 is transported to the product crude hydrogen module outlet 24 of the corresponding SOEC module 10 through the pipe section via the product crude hydrogen single stack outlet 34.

[0074] In the embodiment of the present invention, since the electrolytic cell cores do not need to be separately provided with a heating furnace, the multiple electrolytic cell cores in the SOEC module can be densely arranged; since the electrolytic cell cores arranged in the thermal insulation shell are very close to each other, and the thermal insulation shell has an insulation effect, the ambient temperature inside the thermal insulation shell is the result of the combined effect of the thermal radiation of the electrolytic cell cores. In this way, compared with the method of heating each electrolytic cell core separately in the prior art, the embodiment of the present invention can also effectively improve the stability of the operating temperature of each electrolytic cell core.

[0075] In summary, the SOEC water electrolysis hydrogen production device in the embodiment of the present invention is configured through pipelines so that one air heater can simultaneously perform temperature control for each electrolytic cell core in multiple SOEC modules; since the multiple electrolytic cell cores in the SOEC module in the embodiment of the present invention are densely arranged in the insulation shell, most of the heat energy radiated by the electrolytic cell cores in the insulation shell is confined to the insulation shell, thereby effectively reducing the ambient temperature in which the air heater operates. In this way, the service life of the electric heater is effectively increased and the failure probability of the electric heater is reduced; and thus the operating stability of the SOEC water electrolysis hydrogen production equipment is improved.

[0076] In addition, in an embodiment of the present invention, multiple electrolytic cell cores in the SOEC module are densely arranged in an insulating shell. In this way, the temperature inside the insulating shell is the result of the combined action of the heat energy radiated by the electrolytic cell cores. Therefore, compared with the method of heating each electrolytic cell core separately, the embodiment of the present invention can also effectively improve the stability of the operating temperature of the electrolytic cell core; thereby further improving the operating stability of the SOEC water electrolysis hydrogen production equipment.

[0077] Example 3

[0078] On the basis of the first and second embodiments, with reference to FIG1 and FIG2, the embodiment of the present invention further describes the connection structure of the pipelines in the skid-mounted cabinet of the SOEC water electrolysis hydrogen production equipment, specifically:

[0079] It should be noted that, in the embodiment of the present invention, the connection structure of the pipelines in the skid-mounted cabinet includes multiple pipe sections. The embodiment of the present invention defines the two ends of each pipe section according to the flow direction of the fluid (gas, liquid or gas-liquid mixture) in each pipe section, where the end where the fluid enters is called the inlet end, and the end where the fluid flows out is called the outlet end.

[0080] The first pipe section 41 is provided with a steam generator 07, whose inlet end is connected to the water inlet 01, and its outlet end is connected to the inlet of the mixer 08; the inlet end of the second pipe section 42 is connected to the cathodic protection hydrogen inlet 02, and the outlet end is connected to the inlet of the mixer 08; the inlet end of the third pipe section 43 is connected to the outlet of the mixer 08, and the outlet end is connected to the hydrogen-containing mixed steam module inlet of the first SOEC module in the SOEC module 10; preferably, the third pipe section 43 can also be provided with a steam electric heater 11.

[0081] Thus, deionized ultrapure water enters the skid-mounted cabinet 06 through water inlet 01 and passes through steam generator 07 on first pipe section 41 to form saturated steam. Cathodic protection hydrogen enters second pipe section 42 inside skid-mounted cabinet 06 through cathodic protection hydrogen inlet 02 (preferably, the cathodic protection hydrogen can also be heated in second pipe section 42). The saturated steam and cathodic protection hydrogen then enter mixer 08 for uniform mixing to form hydrogen-containing mixed steam before entering third pipe section 43. Third pipe section 43 is equipped with an electric steam heater 11. The heated hydrogen-containing mixed steam is transported to the hydrogen-containing mixed steam single stack inlet 32 ​​of each electrolytic cell core via hydrogen-containing mixed steam module inlet 22. Steam generator 07 in this embodiment of the present invention can be an electrically heated saturated steam generator or a saturated steam generator heated by an external heat source.

[0082] The product crude hydrogen module outlet of the first SOEC module is connected to the air inlet of the ejector 12; the air outlet of the ejector 12 is connected to the hydrogen-containing mixed steam module inlet of each second SOEC module; the jet port of the ejector 12 is connected to the third pipe section 43; preferably, in an embodiment of the present invention, the nozzle inlet of the ejector 12 is connected to the third pipe section 43. In this way, the product crude hydrogen and part of the hydrogen-containing mixed steam generated by the first SOEC module are transported to the hydrogen-containing mixed steam module inlet of each second SOEC module through the ejector 12. Therefore, after the water vapor is decomposed in the first SOEC module, the generated product crude hydrogen still carries some residual water vapor that has not been electrolyzed. By injecting it into the second SOEC module to further electrolyze this residual water vapor, the hydrogen content in the product crude hydrogen produced by the SOEC water electrolysis hydrogen production device is increased.

[0083] It should be noted that, in the embodiment of the present invention, the SOEC module 10 is divided into a first SOEC module and a second SOEC module, wherein the first SOEC module refers to a SOEC module directly connected to the hydrogen-containing mixed steam in the third pipe section 43; the second SOEC module refers to a SOEC module connected to the product crude hydrogen generated by the first SOEC module, that is, the second SOEC module uses the product crude hydrogen generated by the first SOEC module for further processing.

[0084] In an embodiment of the present invention, there can be multiple SOEC modules 10, and different optimized combinations can be performed according to actual conditions to make the electrolysis of hydrogen-containing mixed steam more complete; in practical applications, the number of SOEC modules 10 can preferably be four, wherein the number of first SOEC modules is one and the number of second SOEC modules is three.

[0085] A fourth pipe section 44 is provided with an air heater 09, the inlet end of which is connected to the air inlet 03, and the outlet end of which is respectively connected to the hot air module inlet 21 of each SOEC module 10; in the embodiment of the present invention, the air heater 09 serves as a heating element for controlling multiple electrolytic cell cores 26 and is arranged outside the SOEC module 10. The SOEC module 10 is provided with an insulating shell 25. Therefore, the heat radiation from the electrolytic cell cores 26 cannot directly affect the air heater 09.

[0086] Each oxygen-enriched air module outlet 23 is connected to the inlet end of the fifth pipe segment 45, and the outlet end of the fifth pipe segment 45 is connected to the oxygen-enriched air outlet 05. The oxygen-enriched air generated by each electrolytic cell core 26 in the SOEC module 10 is concentrated and externally connected through the oxygen-enriched air module outlet 23. Then, each oxygen-enriched air module outlet 23 is respectively connected to the fifth pipe segment 45 and then centrally connected to the oxygen-enriched air outlet 05 on the skid-mounted cabinet 06.

[0087] The crude hydrogen product module outlet 24 of each second SOEC module is connected to the inlet end of the sixth pipe segment 46, and the outlet end of the sixth pipe segment 46 is connected to the crude hydrogen product outlet 04. The crude hydrogen product generated by each electrolytic cell core 26 within the second SOEC module is collected and then connected externally through the crude hydrogen product module outlet 24. Subsequently, each crude hydrogen product module outlet 24 is connected to the sixth pipe segment 46 and then connected externally to the crude hydrogen product outlet 04 on the skid-mounted cabinet 06.

[0088] Preferably, in an embodiment of the present invention, a plurality of gas heat exchangers 47 may be provided, which are respectively provided at the contact points between the sixth pipe segment 46 and the first pipe segment 41 , the contact points between the sixth pipe segment 46 and the second pipe segment 42 , and the contact points between the fourth pipe segment 44 and the fifth pipe segment 45 .

[0089] Preferably, in the embodiment of the present invention, the sixth pipe section 46 is further provided with a bypass 48, and each bypass 48 is respectively provided on both sides of the contact point between the sixth pipe section 46 and the first pipe section 41, and on both sides of the contact point between the sixth pipe section 46 and the second pipe section 42; in this way, when the product crude hydrogen in the sixth pipe section 46 fails at the position of a certain heat exchanger 47, the corresponding bypass 48 can also be used as a backup path to avoid affecting the normal operation of the equipment.

[0090] Preferably, the number of SOEC modules in the embodiment of the present invention may be four; wherein the number of the first SOEC module is one, and the number of the second SOEC modules is three.

[0091] Example 4

[0092] Based on any one of the SOEC water electrolysis hydrogen production devices in Examples 1 to 3, with reference to FIG2 , the pipe connection structure within the SOEC module 10 in the embodiment of the present invention may include:

[0093] The inlet end of the seventh pipe section 51 is connected to the hydrogen-containing mixed steam module inlet 22, and the outlet end thereof is connected to the inlet 32 ​​of each hydrogen-containing mixed steam single stack;

[0094] In an embodiment of the present invention, the electrolytic cell cores are divided into multiple groups, each group includes multiple electrolytic cell cores connected in series, and the oxygen-enriched air single stack outlet of the first electrolytic cell core in the group is connected to the hot air single stack inlet of the subsequent electrolytic cell core; in this embodiment of the present invention, the SOEC module 10 includes four electrolytic cell cores, which are divided into two groups, each group including two electrolytic cell cores.

[0095] The inlet end of the eighth pipe section 52 is connected to the hot air module inlet 21, and the outlet end thereof is connected to the hot air single stack inlet 31 of the first electrolytic cell core in each group;

[0096] The inlet end of the ninth pipe section 53 is respectively connected to the oxygen-enriched air single stack outlet 33 of the last electrolytic cell core in each group, and its outlet end is connected to the oxygen-enriched air module outlet 23; the inlet end of the tenth pipe section 54 is respectively connected to the outlet 34 of each product crude hydrogen single stack, and its outlet end is connected to the product crude hydrogen module outlet 24.

[0097] By connecting the electrolytic cell cores in each group in series in sequence, the oxygen-enriched air discharged from the oxygen-enriched air single stack outlet of the first electrolytic cell core in the group can be introduced into the hot air single stack inlet of the subsequent electrolytic cell core, and the heat of the oxygen-enriched air can be utilized in the subsequent electrolytic cell core to further reduce the heating demand for the air heater 09 and improve energy utilization.

[0098] Preferably, in an embodiment of the present invention, a backup bypass 55 may be provided between the hot air single stack inlet 31 and the oxygen-enriched air single stack outlet 33 of the electrolytic cell core 26. In this way, when a failure occurs in a certain electrolytic cell core 26, the corresponding bypass 55 may be used as a backup path to avoid affecting the normal operation of the SOEC module.

[0099] The conventional method of heating a fuel cell stack in an electric furnace is to place the stack inside an electric furnace equipped with heating elements such as electric heating wires. The heating wires heat the stack to the desired temperature. This conventional heating method primarily utilizes heat radiation from the heating elements to preheat the air and the stack within the furnace. This requires a long preheating time and the heating elements are constantly at high temperatures. The air within the furnace remains essentially static throughout the entire operation, resulting in a low heat transfer rate. Furthermore, the heating elements remain constantly at high temperatures, preventing effective cooling and making them susceptible to damage.

[0100] The embodiment of the present invention adopts a preheating method of heating air outside the SOEC module and then introducing high-temperature air into the cores of each electrolytic cell inside the SOEC module. Since the high-temperature air flows inside the electrolytic cell core, the heating rate of raising the temperature of the cell stack to the required temperature is fast through convection, heat conduction and heat radiation, and the preheating time is also short. In addition, in the embodiment of the present invention, the heating element inside the electric heater used for heating the air is always in a flowing air state during the heating process, so the heating element is not easily damaged by high-temperature heating.

[0101] The embodiment of the present invention adopts the SOEC module method, which can compactly arrange multiple individual electrolytic cell cores in a cavity (insulation shell). The electrolytic cell cores can serve as heat sources for each other, and their heat will interact with each other, which is conducive to maintaining a good high-temperature atmosphere inside the cavity. At the same time, the SOEC module can easily perform insulation design, and it is only necessary to perform insulation in the insulation shell. Since the shape of the insulation shell can be made relatively regular, there is no need for excessive special-shaped insulation. Therefore, the embodiment of the present invention can simplify the structure of the insulation component. In addition, the insulation shell in the embodiment of the present invention is a hollow component, which can also reduce the weight of the cavity and the use of materials while providing good insulation and heat insulation.

[0102] The electrolytic cell cores in the embodiment of the present invention can realize parallel or series connection of multiple electrolytic cell cores through mutual air supply, which can fully and repeatedly utilize the heat of high-temperature air and reduce the loss of high-temperature air heat. At the same time, the compact arrangement in the embodiment of the present invention can also reduce the spacing between the electrolytic cell cores, thereby achieving optimal utilization of space and floor space.

[0103] In the embodiment of the present invention, the SOEC modules can use an ejector to eject the crude hydrogen product of the upper module to the next module (i.e., eject the crude hydrogen product of the first SOEC module to the second SOEC module). In this way, the cascade utilization of multiple SOEC modules can be achieved, thereby improving the reuse rate of steam and reducing the direct cooling of the crude hydrogen product to achieve direct heat utilization.

[0104] Example 5

[0105] In an embodiment of the present invention, as shown in FIG3 , the pipe connection structure in the SOEC module 10 can also be configured as follows:

[0106] The inlet end of the seventh pipe section 61 is connected to the hydrogen-containing mixed steam module inlet 22, and the outlet end thereof is connected to each hydrogen-containing mixed steam single stack inlet 32; the inlet end of the eighth pipe section 62 is connected to the hot air module inlet 21, and the outlet end thereof is connected to each hot air single stack inlet 31;

[0107] The inlet end of the ninth pipe section 63 is connected to each oxygen-enriched air single stack outlet 33, and its outlet end is connected to the oxygen-enriched air module outlet 23; the inlet end of the tenth pipe section 64 is connected to each product crude hydrogen single stack outlet 34, and its outlet end is connected to the product crude hydrogen module outlet 24.

[0108] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A SOEC water electrolysis hydrogen production device based on a multi-core module, characterized in that: include: a steam generator for generating steam by heating water; A mixer, the mixer being used for mixing the cathodic protection hydrogen gas and the steam generated by the steam generator into hydrogen-containing mixed steam; an air heater for heating air to generate hot air; An SOEC module, the SOEC module comprising a heat-insulating shell and a plurality of electrolytic cell cores arranged in the heat-insulating shell, the heat-insulating shell being provided with a hot air module inlet, a hydrogen-containing mixed steam module inlet, an oxygen-enriched air module outlet and a product crude hydrogen module outlet; Wherein, the hydrogen-containing mixed steam output by the mixer can be supplied to the hydrogen-containing mixed steam single stack inlet of each of the electrolytic cell cores through the hydrogen-containing mixed steam module inlet, the hot air generated by the air heater can be supplied to the hot air single stack inlet of each of the electrolytic cell cores through the hot air module inlet, and the oxygen-enriched air module outlet and the product crude hydrogen module outlet are configured to respectively discharge the oxygen-enriched air and the product crude hydrogen generated by each of the electrolytic cell cores.

2. The SOEC water electrolysis hydrogen production device based on multiple core modules according to claim 1 is characterized in that: The invention also includes a skid-mounted cabinet, in which the steam generator, mixer, air heater and SOEC module are respectively arranged. The skid-mounted cabinet is provided with a water inlet for supplying the water to the steam generator, a cathodic protection hydrogen inlet for supplying the cathodic protection hydrogen to the mixer, an air inlet for supplying the air to the air heater, a product crude hydrogen outlet connected to the product crude hydrogen module outlet, and an oxygen-enriched air outlet connected to the oxygen-enriched air module outlet.

3. The SOEC water electrolysis hydrogen production device based on multiple core modules according to claim 1 or 2, characterized in that: It comprises a plurality of the SOEC modules, which include a first SOEC module and a plurality of second SOEC modules connected via an ejector, wherein the product crude hydrogen module outlet of the first SOEC module is connected to the air inlet of the ejector, the air outlet of the ejector is connected to the hydrogen-containing mixed steam module inlet of each second SOEC module, and the product crude hydrogen module outlet of each second SOEC module is respectively connected to the product crude hydrogen outlet.

4. The SOEC water electrolysis hydrogen production device based on multiple core modules according to claim 3 is characterized in that: It also includes a steam electric heater. The hydrogen-containing mixed steam output by the mixer is heated by the steam electric heater and then supplied to the hydrogen-containing mixed steam module inlet of the first SOEC module and the nozzle inlet of the ejector.

5. The SOEC water electrolysis hydrogen production device based on multiple core modules according to claim 3 is characterized in that: The number of the SOEC modules is four; Among them, the number of the first SOEC modules is one, and the number of the second SOEC modules is three.

6. The SOEC water electrolysis hydrogen production device based on multiple core modules according to claim 1 or 2, characterized in that: Also includes: a first heat exchanger configured to exchange heat between steam generated by the steam generator and product crude hydrogen discharged from the SOEC module; and / or, a second heat exchanger configured to exchange heat between the cathodic protection hydrogen and the product crude hydrogen discharged from the SOEC module before being introduced into the mixer; and / or, A third heat exchanger is configured to exchange heat between the air and oxygen-enriched air exhausted from the SOEC module before the air is passed into the air heater.

7. The SOEC water electrolysis hydrogen production device based on multiple core modules according to claim 6 is characterized in that: The invention also includes bypass flow paths respectively connected in parallel with the first heat exchanger, the second heat exchanger and the third heat exchanger.

8. The SOEC water electrolysis hydrogen production device based on multiple core modules according to any one of claims 1 to 7, characterized in that: The multiple electrolytic cell cores are divided into multiple groups, each group includes multiple electrolytic cell cores connected in series in sequence, and the oxygen-enriched air single stack outlet of the first electrolytic cell core in each group is connected to the hot air single stack inlet of the subsequent electrolytic cell core, and the oxygen-enriched air single stack outlet of the last electrolytic cell core in each group is connected to the oxygen-enriched air module outlet through a pipe section.

9. The SOEC water electrolysis hydrogen production device based on multiple core modules according to claim 8, characterized in that: A backup bypass is provided between the hot air single stack inlet and the oxygen-enriched air single stack outlet of at least part of the electrolytic cell cores.

10. A SOEC module for a SOEC water electrolysis hydrogen production device, characterized in that: The SOEC module includes a heat-insulating shell and a plurality of electrolytic cell cores arranged in the heat-insulating shell; the heat-insulating shell is provided with a hot air module inlet, a hydrogen-containing mixed steam module inlet, an oxygen-enriched air module outlet and a product crude hydrogen module outlet, each of the electrolytic cell cores includes a hot air single stack inlet, a hydrogen-containing mixed steam single stack inlet, an oxygen-enriched air single stack outlet and a product crude hydrogen single stack outlet, and the heat-insulating shell is provided with a plurality of pipe sections connected between the hydrogen-containing mixed steam module inlet and each of the hydrogen-containing mixed steam single stack inlets, between the hot air module inlet and at least part of the hot air single stack inlets of the electrolytic cell cores, between the oxygen-enriched air module outlet and at least part of the oxygen-enriched air single stack outlets of the electrolytic cell cores, and between the product crude hydrogen module outlet and each of the product crude hydrogen single stack outlets.

11. The SOEC module for the SOEC water electrolysis hydrogen production device according to claim 10, characterized in that: The multiple electrolytic cell cores are divided into multiple groups, each group includes multiple electrolytic cell cores connected in series in sequence, and the oxygen-enriched air single stack outlet of the first electrolytic cell core in each group is connected to the hot air single stack inlet of the subsequent electrolytic cell core, and the oxygen-enriched air single stack outlet of the last electrolytic cell core in each group is connected to the oxygen-enriched air module outlet through a pipe section.

12. The SOEC module for a SOEC water electrolysis hydrogen production device according to claim 10 or 11, characterized in that: A standby bypass is provided between the hot air single stack inlet and the oxygen-enriched air single stack outlet of the electrolytic cell core.

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