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

Abstract

The invention discloses SOEC modules and an SOEC water electrolysis hydrogen production device based on multiple reactor core modules. The SOEC water electrolysis hydrogen production device comprises a skid-mounted cabinet body, a steam generator, a mixer, an air electric heater and a plurality of SOEC modules, wherein the skid-mounted cabinet body is provided with a deionized ultrapure water inlet, a cathode protection hydrogen inlet, a cold air inlet, a product crude hydrogen outlet and an oxygen-enriched air outlet; the SOEC module comprises a thermal insulation shell and a plurality of electrolytic tank reactor cores; the thermal insulation shell is 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; the electrolytic tank core comprises a high-temperature air single-pile inlet, a hydrogen-containing mixed steam single-pile inlet, an oxygen-enriched air single-pile outlet and a product crude hydrogen single-pile outlet; the mixer is used for mixing cathode protection hydrogen and steam generated by the steam generator into hydrogen-containing mixed steam; the working environment temperature of the air electric heater can be effectively reduced, so that the fault probability of the electric heater is reduced; and further, the operation stability of the SOEC water electrolysis hydrogen production equipment is improved.

Description

Technical Field

[0001] The invention relates to the technical field of water electrolysis hydrogen production, and in particular to a SOEC module and a SOEC water electrolysis hydrogen production device based on a multi-core module. Background Art

[0002] There are three main ways to use renewable energy to generate electricity through water electrolysis to produce hydrogen: alkaline water electrolysis to produce hydrogen, proton exchange membrane water electrolysis to produce hydrogen, and solid oxide (SOEC) water electrolysis to produce hydrogen.

[0003] SOEC water electrolysis hydrogen production technology is the mainstream water electrolysis hydrogen production technology in the future because of its high electrolysis efficiency (more than 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.

[0004] In the prior art, the skid-mounted method of SOEC water electrolysis hydrogen production based on multiple core modules is generally: 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.

[0005] The inventors have found through research that the skid-mounted method of producing hydrogen by electrolyzing water using SOEC based on multiple core modules in the prior art still has at least the following defects:

[0006] The high-temperature heating elements of the electric furnace are easily damaged because they are always in a high-temperature state without a good cooling effect, which in turn affects the operating stability of the SOEC water electrolysis hydrogen production equipment.

[0007] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0008] The purpose of the present invention is to improve the operating stability of SOEC water electrolysis hydrogen production equipment.

[0009] The present invention provides a SOEC water electrolysis hydrogen production device based on a multi-core module, comprising:

[0010] 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 electric heater and a plurality of SOEC modules arranged in the skid-mounted cabinet;

[0011] 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 core includes 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;

[0012] 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 electric 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.

[0013] Preferably, in the embodiment of the present invention, it also includes:

[0014] 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 corresponding oxygen-enriched air module outlet of the 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 corresponding product crude hydrogen module outlet of the SOEC module.

[0015] Preferably, in an embodiment of the present invention, the pipeline connection structure in the skid-mounted cabinet includes:

[0016] 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;

[0017] A second pipe section whose inlet end is connected to the cathode protection hydrogen inlet and whose outlet end is connected to the inlet of the mixer;

[0018] A third pipe section provided with the steam electric heater, the inlet end of which is connected to the outlet of the mixer, and the outlet end of which is connected to the inlet of the hydrogen-containing mixed steam module of the first SOEC module in the SOEC modules;

[0019] 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;

[0020] A fourth pipe section provided with the air electric heater, the inlet end of which is connected to the cold air inlet, and the outlet end of which is respectively connected to the high temperature air module inlet of each SOEC module;

[0021] The outlets of the oxygen-enriched air modules are respectively 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;

[0022] The product crude hydrogen module outlet of each of the second SOEC modules is respectively connected to the inlet end of the sixth pipe segment, and the outlet end of the sixth pipe segment is connected to the product crude hydrogen outlet.

[0023] Preferably, in the embodiment of the present invention, a plurality of gas heat exchangers are further included, which are respectively arranged at:

[0024] 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.

[0025] Preferably, in the embodiment of the present invention, the sixth pipe section is further provided with a bypass, which is respectively provided at:

[0026] 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.

[0027] Preferably, in the embodiment of the present invention, the number of the SOEC modules is four;

[0028] Among them, the number of the first SOEC modules is one, and the number of the second SOEC modules is three.

[0029] Preferably, in an embodiment of the present invention, the nozzle inlet of the ejector is connected to the third pipe section.

[0030] 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 comprises the above-mentioned SOEC water electrolysis hydrogen production device based on a multi-core module, and the pipeline connection structure in the SOEC module comprises:

[0031] 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;

[0032] 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;

[0033] 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 high-temperature air single stack inlet of the first electrolytic cell core in each group;

[0034] A ninth pipe section whose outlet end is connected to the outlet of the oxygen-enriched air module and whose inlet end is respectively connected to the oxygen-enriched air single stack outlet of the last electrolytic cell core in each group;

[0035] The tenth pipe section, whose outlet end 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.

[0036] 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 comprises the above-mentioned SOEC water electrolysis hydrogen production device based on a multi-core module, and the pipeline connection structure in the SOEC module comprises:

[0037] 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;

[0038] 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;

[0039] A ninth pipe section whose inlet end is respectively 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;

[0040] 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.

[0041] Preferably, in the embodiment of the present invention, it also includes:

[0042] A standby bypass is provided between the high-temperature air single stack inlet and the oxygen-enriched air single stack outlet of the electrolytic cell core.

[0043] Preferably, in the 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.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] The SOEC water electrolysis hydrogen production device of the present invention is arranged through pipelines so that one air electric heater can simultaneously control the temperature of each electrolytic cell core in a plurality of SOEC modules; since the multiple electrolytic cell cores in the SOEC module of the present invention are densely arranged in a heat-insulating shell, most of the heat energy radiated by the electrolytic cell cores in the heat-insulating shell is limited in the heat-insulating shell, thereby effectively reducing the ambient temperature of the air electric heater, thus effectively improving the service life of the electric heater and reducing the failure probability of the electric heater; and further improving the operation stability of the SOEC water electrolysis hydrogen production device.

[0046] In addition, in the present invention, multiple electrolytic cell cores in the SOEC module are densely arranged in the insulation shell, so that the temperature in the insulation shell is the result of the combined effect of the heat energy radiated by the electrolytic cell cores therein. Therefore, compared with the method of heating each electrolytic cell core separately, the present invention can also effectively improve the stability of the working temperature of the electrolytic cell core; thereby further improving the operating stability of the SOEC water electrolysis hydrogen production equipment.

[0047] 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 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 the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments will be briefly introduced below. 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 creative work.

[0049] Figure 1 It is a structural schematic diagram of the SOEC water electrolysis hydrogen production device described in the present invention;

[0050] Figure 2 It is a structural schematic diagram of the SOEC module described in the present invention;

[0051] Figure 3 It is another structural schematic diagram of the SOEC module described in the present invention. DETAILED DESCRIPTION

[0052] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0053] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0054] In this document, the terms "first", "second", etc. are used to distinguish two different elements or parts, and are not used to limit a specific position or relative relationship. In other words, in some embodiments, the terms "first", "second", etc. can also be interchangeable.

[0055] Embodiment 1

[0056] In order to improve the operating stability of SOEC water electrolysis hydrogen production equipment, refer to Figure 1 and Figure 2 In an embodiment of the present invention, a SOEC water electrolysis hydrogen production device based on a multi-core module is provided, comprising:

[0057] A skid-mounted cabinet 06 is provided with a deionized ultrapure water inlet 01, a cathodic protection hydrogen inlet 02, a cold air inlet 03, a product crude hydrogen outlet 04 and an oxygen-enriched air outlet 05, and a steam generator 07, a mixer 08, an air electric heater 09 and a plurality of SOEC modules 10 arranged in the skid-mounted cabinet 06;

[0058] The SOEC module 10 includes a heat-insulating shell 25 provided with a high-temperature 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 in the heat-insulating shell 25; the electrolytic cell cores 26 include a high-temperature 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;

[0059] 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 electric heater 09 is used to heat the air from the cold air inlet 03 into high-temperature air; the high-temperature air is transported to the high-temperature air single stack inlet 31 of each electrolytic cell core via the high-temperature air module inlet 21.

[0060] The following is a skid-mounted cabinet with 4 SOEC modules, each of which contains 4 electrolytic cell cores ( Figure 2 The working principle of the embodiment of the present invention is described as follows:

[0061] In the embodiment of the present invention, on the one hand, deionized ultrapure water enters the skid-mounted cabinet 06 through the deionized ultrapure water inlet 01, and forms saturated steam through the steam generator 07 (electrically heated saturated steam generator); on the other hand, cathodic protection hydrogen enters the skid-mounted cabinet 06 through the cathodic protection hydrogen inlet 02 and is heated, and then the saturated steam and the cathodic protection hydrogen are uniformly mixed in the mixer 08. The mixed 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.

[0062] In addition, air enters the skid-mounted cabinet 06 through the cold air inlet 03, is heated to high-temperature air by the air electric heater 09, and then is transported to the high-temperature air single stack inlet 31 of each electrolytic cell core through the high-temperature air module inlet 21. That is, in the embodiment of the present invention, an air electric heater 09 is provided for heating air, and the heated high-temperature air enters each insulation shell 25 through a plurality of branch pipe sections, and then is further connected to the high-temperature air single stack inlet 31 of each electrolytic cell core 26 in the SOEC module 10 through the branch pipe sections.

[0063] In the 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 limited in the insulation shell 25; and the air electric 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.

[0064] Embodiment 2

[0065] On the basis of the first embodiment, further, in the embodiment of the present invention, the oxygen-enriched air and the product crude hydrogen generated by each electrolytic cell core 26 may be configured as follows:

[0066] The oxygen-enriched air generated by the electrolytic cell core 26 is transported via the oxygen-enriched air single stack outlet 33 through a pipe section to the oxygen-enriched air module outlet 23 of the corresponding SOEC module 10; the product crude hydrogen generated by the electrolytic cell core 26 is transported via the product crude hydrogen single stack outlet 34 through a pipe section to the product crude hydrogen module outlet 24 of the corresponding SOEC module 10.

[0067] In the embodiment of the present invention, since the electrolytic cell core does 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 insulation shell are very close, and the insulation shell has an insulation effect, the ambient temperature in the 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.

[0068] In summary, the SOEC water electrolysis hydrogen production device in the embodiment of the present invention is arranged through pipelines so that one air electric 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 limited in the insulation shell, thereby effectively reducing the ambient temperature of the air electric heater, thus effectively improving the service life of the electric heater and reducing the failure probability of the electric heater; thereby improving the operating stability of the SOEC water electrolysis hydrogen production equipment.

[0069] 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 in the insulating shell is the result of the combined effect of the heat energy radiated by the electrolytic cell cores therein. 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.

[0070] Embodiment 3

[0071] Based on the first and second embodiments, Figure 1 and Figure 2 The embodiment of the present invention further records the connection structure of the pipelines in the skid-mounted cabinet of the SOEC water electrolysis hydrogen production equipment, specifically:

[0072] It should be noted that, in the embodiment of the present invention, the connection structure of the pipeline 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, wherein the end where the fluid enters is called the inlet end, and the end where the fluid flows out is called the outlet end.

[0073] The first pipe section 41 is provided with a steam generator 07, whose inlet end is connected to the deionized ultrapure water inlet 01, and whose 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.

[0074] In this way, deionized ultrapure water enters the skid-mounted cabinet 06 through the deionized ultrapure water inlet 01, and forms saturated steam through the steam generator 07 on the first pipe section 41; the cathodic protection hydrogen enters the second pipe section 42 inside the skid-mounted cabinet 06 through the cathodic protection hydrogen inlet 02 (preferably, the cathodic protection hydrogen can also be heated in the second pipe section 42), and then the saturated steam and the cathodic protection hydrogen enter the mixer 08 respectively to be evenly mixed into hydrogen-containing mixed steam and then enter the third pipe section 43; the third pipe section 43 is provided with a steam electric 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 the hydrogen-containing mixed steam module inlet 22. The steam generator 07 in the embodiment of the present invention can be an electrically heated saturated steam generator or a saturated steam generator heated by an external heat source.

[0075] 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 the 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.

[0076] 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.

[0077] In the 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 hydrogen-containing mixed steam electrolysis 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.

[0078] A fourth pipe section 44 is provided with an air electric heater 09, the inlet end of which is connected to the cold air inlet 03, and the outlet end of which is respectively connected to the high-temperature air module inlet 21 of each SOEC module 10; in the embodiment of the present invention, the air electric heater 09 is used 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 of the electrolytic cell core 26 cannot directly affect the air electric heater 09.

[0079] Each oxygen-enriched air module outlet 23 is respectively 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, and 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.

[0080] The product crude hydrogen module outlet 24 of each second SOEC module is respectively 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 product crude hydrogen outlet 04. The product crude hydrogen generated by each electrolytic cell core 26 in the second SOEC module is concentrated and connected to the outside through the product crude hydrogen module outlet 24. Then, each product crude hydrogen module outlet 24 is respectively connected to the sixth pipe segment 46 and then centrally connected to the product crude hydrogen outlet 04 on the skid-mounted cabinet 06.

[0081] Preferably, in the 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 .

[0082] Preferably, in the embodiment of the present invention, the sixth pipe segment 46 is further provided with a bypass 48, and each bypass 48 is respectively arranged on both sides of the contact point between the sixth pipe segment 46 and the first pipe segment 41, and on both sides of the contact point between the sixth pipe segment 46 and the second pipe segment 42; in this way, when the product crude hydrogen in the sixth pipe segment 46 fails at the position of a certain heat exchanger 47, the corresponding bypass 48 can also be used as a backup passage to avoid affecting the normal operation of the equipment.

[0083] 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.

[0084] Embodiment 4

[0085] Based on any SOEC water electrolysis hydrogen production device in Examples 1 to 3, refer to Figure 2 The pipeline connection structure in the SOEC module 10 in the embodiment of the present invention may include:

[0086] 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 each hydrogen-containing mixed steam single stack inlet 32;

[0087] 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 in sequence, and the oxygen-rich 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; in an embodiment of the present invention, the SOEC module 10 includes 4 electrolytic cell cores, which are divided into two groups, each group including two electrolytic cell cores.

[0088] The inlet end of the eighth pipe section 52 is connected to the high-temperature air module inlet 21, and the outlet end thereof is respectively connected to the high-temperature air single stack inlet 31 of the first electrolytic cell core in each group;

[0089] 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 the outlet end thereof is connected to the oxygen-enriched air module outlet 23; the inlet end of the tenth pipe section 54 is respectively connected to each product crude hydrogen single stack outlet 34, and the outlet end thereof is connected to the product crude hydrogen module outlet 24.

[0090] Preferably, in an embodiment of the present invention, a backup bypass 55 may be provided between the high-temperature 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.

[0091] In the prior art, the method of heating the battery stack with an electric furnace is usually as follows: the battery stack is placed in an electric furnace, and heating elements such as electric heating wires are arranged in the furnace; the battery stack is heated to the required temperature by heating the heating wires. This heating method in the prior art mainly utilizes the heat radiation of the electric heating element to preheat the air and the battery stack in the furnace. The preheating time required is relatively long, and the electric heating element is always in a high temperature state; during the entire working process, the air in the heating furnace is basically in a static state, so the heat transfer rate is low; in addition, its high-temperature heating element is always in a high temperature state and cannot be effectively cooled, so it is easy to be damaged.

[0092] The embodiment of the present invention adopts a preheating method of heating the 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 battery stack to the required temperature is faster through convection, heat conduction and thermal radiation, and the preheating time is also shorter. In addition, in the embodiment of the present invention, the heating element in 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.

[0093] The embodiment of the present invention adopts the SOEC module mode, and multiple separate electrolytic cell cores can be compactly arranged in a cavity (insulation shell). The cores of each electrolytic cell can serve as heat sources for each other, and their heat will interact with each other, which is conducive to the good maintenance of the high-temperature atmosphere inside the cavity; compared with the prior art that a single electrolytic cell core requires very good insulation measures to maintain the high-temperature atmosphere, the embodiment of the present invention can more easily maintain the stability of the electrolytic cell core temperature; at the same time, the SOEC module can easily perform insulation design, and it is only necessary to do insulation in the insulation shell. Since the shape of the insulation shell can be made more regular, there is no need to perform too much special-shaped insulation. Therefore, compared with the prior art that each electrolytic cell core needs to be insulated separately and a separate special-shaped insulation is performed at the same time, 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, so it can also reduce the weight of the cavity and the use of materials while playing a good insulation and heat insulation role.

[0094] 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 realize full and repeated utilization of high-temperature air heat and reduce high-temperature air heat loss. At the same time, the compact arrangement in the embodiment of the present invention can also reduce the interval between the electrolytic cell cores, thereby realizing optimal utilization of space and land.

[0095] In the embodiment of the present invention, the SOEC modules can be connected through 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) for use. In this way, multiple SOEC modules can be used in cascade, thereby improving the reuse rate of steam and reducing direct cooling of the crude hydrogen product to achieve direct heat utilization.

[0096] Embodiment 5

[0097] In the embodiment of the present invention, Figure 3 As shown, the pipe connection structure in the SOEC module 10 can also be set as follows:

[0098] 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 respectively connected to each hydrogen-containing mixed steam single stack inlet 32; the inlet end of the eighth pipe section 62 is connected to the high-temperature air module inlet 21, and the outlet end thereof is respectively connected to each high-temperature air single stack inlet 31;

[0099] The inlet end of the ninth pipe section 63 is connected to each oxygen-enriched air single stack outlet 33, and the outlet end thereof 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 the outlet end thereof is connected to the product crude hydrogen module outlet 24.

[0100] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those 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 will not be limited to the embodiments shown herein, but will 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 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 electric heater and a plurality of SOEC modules arranged in the skid-mounted cabinet; 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 core includes 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; 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 electric 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 through the high-temperature air module inlet.

2. The SOEC water electrolysis hydrogen production device based on multiple core modules according to claim 1 is characterized in that: Also includes: 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 corresponding oxygen-enriched air module outlet of the 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 corresponding product crude hydrogen module outlet of the SOEC module.

3. The SOEC water electrolysis hydrogen production device based on multiple core modules according to claim 2 is characterized in that: The pipe section connection structure in the skid-mounted cabinet includes: 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; A second pipe section whose inlet end is connected to the cathode protection hydrogen inlet and whose outlet end is connected to the inlet of the mixer; A third pipe section provided with the steam electric heater, the inlet end of which is connected to the outlet of the mixer, and the outlet end of which is connected to the inlet of the hydrogen-containing mixed steam module of the first SOEC module in the SOEC modules; 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; A fourth pipe section provided with the air electric heater, the inlet end of which is connected to the cold air inlet, and the outlet end of which is respectively connected to the high temperature air module inlet of each SOEC module; The outlets of the oxygen-enriched air modules are respectively 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; The product crude hydrogen module outlet of each of the second SOEC modules is respectively connected to the inlet end of the sixth pipe segment, and the outlet end of the sixth pipe segment is 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 plurality of gas heat exchangers, which are respectively located at: 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.

5. The SOEC water electrolysis hydrogen production device based on multiple core modules according to claim 4 is characterized in that: The sixth pipe section is also provided with a bypass, which is respectively provided at: 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.

6. The SOEC water electrolysis hydrogen production device based on multiple core modules according to claim 5 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.

7. The SOEC water electrolysis hydrogen production device based on multiple core modules according to claim 3 is characterized in that: The nozzle inlet of the ejector is connected to the third pipe section.

8. A SOEC module for a SOEC water electrolysis hydrogen production device, the SOEC water electrolysis hydrogen production device comprising the SOEC water electrolysis hydrogen production device based on a multi-core module according to any one of claims 1 to 7, characterized in that: The pipeline connection structure in the SOEC module includes: 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; 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; 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 high-temperature air single stack inlet of the first electrolytic cell core in each group; A ninth pipe section whose outlet end is connected to the outlet of the oxygen-enriched air module and whose inlet end is respectively connected to the oxygen-enriched air single stack outlet of the last electrolytic cell core in each group; The tenth pipe section, whose outlet end 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.

9. A SOEC module for a SOEC water electrolysis hydrogen production device, the SOEC water electrolysis hydrogen production device comprising the SOEC water electrolysis hydrogen production device based on a multi-core module according to any one of claims 1 to 7, characterized in that: The pipeline connection structure in the SOEC module includes: 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; 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; A ninth pipe section whose inlet end is respectively 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; 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.

10. The SOEC module for a SOEC water electrolysis hydrogen production device according to claim 8 or 9, characterized in that: Also includes: A standby bypass is provided between the high-temperature air single stack inlet and the oxygen-enriched air single stack outlet of the electrolytic cell core.

11. The SOEC module for the SOEC water electrolysis hydrogen production device according to claim 10, characterized in that: The number of electrolytic cell cores in a single SOEC module is 2 to 10, and every two electrolytic cell cores form a group.

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