Water vapor and gas mixing device applied to SOEC system and use method of water vapor and gas mixing device

Abstract

The invention relates to a water vapor and gas mixing device applied to an SOEC system and a using method thereof.The water vapor and gas mixing device comprises a shell, a gas mixing plate and a heating element, a cavity is formed in the shell, and the cavity is provided with a front-end mixing cavity body and a rear-end mixing cavity body; a mixed gas outlet pipeline is arranged at the rear end of the shell; a water vapor inlet pipeline and a gas inlet pipeline are arranged at the front end of the shell; the gas mixing plate is arranged in the rear-end mixing cavity, and holes are formed in the gas mixing plate; the heating element is arranged in the rear-end mixing cavity; water vapor can be prevented from being condensed before entering a reaction electric pile, and the electric pile is prevented from being damaged; water vapor and gas can be uniformly mixed, and the utilization rate of a reactor is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of high-temperature gas mixing, and in particular relates to a water vapor and gas mixing device applied to a SOEC system and a use method thereof. Background Art

[0002] High-temperature electrolysis of CO2 and water to produce syngas is a renewable energy technology that can convert carbon dioxide and water into syngas through electrolysis. Syngas is a mixed gas composed of hydrogen and carbon monoxide, which can be used as a fuel or converted into other chemicals through chemical reactions. The technology of high-temperature electrolysis of CO2 and water to produce syngas has many advantages. First, it can effectively utilize carbon dioxide and water and reduce dependence on oil and natural gas. Second, it can convert energy through electrical energy, which has the advantages of being clean and environmentally friendly. In addition, as a fuel, syngas can replace traditional fuels with higher combustion efficiency and lower pollution. At present, the main methods of CO2 conversion are thermochemical conversion, photochemical conversion, electrochemical conversion and biological conversion. Thermochemical conversion usually needs to be completed under high temperature (above 1010℃) and high pressure, which has strict requirements on catalysts, reaction devices and materials, and has low energy efficiency; the efficiency of photochemical conversion is generally less than 1%, and the maximum efficiency is only 4.5%, and the reaction selectivity is poor; while biological conversion of CO2 is still in the exploratory stage. Electrochemical conversion technology is the most attractive. On the one hand, product regulation can be achieved by controlling the working voltage and catalyst. On the other hand, environmentally friendly renewable energy (such as wind power, solar photovoltaic and biomass power generation) and nuclear energy can be used to achieve electrochemical conversion of CO2.

[0003] Solid oxide electrolyzer (SOEC) converts CO2 and H2O into synthesis gas and hydrocarbon fuels and produces high-purity O2 in parallel. This research has the advantages of all-solid-state and modular structure, fast reaction rate, high energy efficiency and low cost, and shows great potential for application in CO2 conversion and renewable clean electricity storage. This process synthesizes gases such as carbon dioxide, water, and hydrogen by reacting in a high-temperature fuel cell to generate gases such as oxygen and carbon monoxide. In this process, if the temperature of the mixed gas changes, it will cause condensation of water vapor. If the water vapor condenses before entering the reactor, it may cause damage to the fuel cell, or uneven mixing of multiple gases, which will also cause the utilization rate of the stack to decrease. Summary of the invention

[0004] In view of at least one of the problems in the above-mentioned prior art, the object of the present invention is to provide a water vapor and gas mixing device for use in a SOEC system and a method of using the same, which can prevent the condensation of water vapor before entering the reactor stack and avoid damage to the reactor stack; and facilitate uniform mixing of water vapor and gas, thereby improving the utilization rate of the stack.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A water vapor and gas mixing device applied to a SOEC system, comprising: The shell has a cavity inside, wherein the cavity is provided with a front mixing cavity and a rear mixing cavity; a mixed gas outlet pipeline is provided at the rear end of the shell; a water vapor inlet pipeline and a gas inlet pipeline are provided at the front end of the shell; A gas mixing plate, disposed in the rear mixing chamber, and having holes formed on the gas mixing plate; A heating element is arranged in the rear mixing chamber.

[0006] Preferably, the gas mixing plate has at least two holes, and the number of gas mixing plates is at least two.

[0007] Preferably, a support member is provided in the rear end mixing chamber, and the plurality of gas mixing plates are connected via the support member.

[0008] Preferably, a support point is arranged on the inner wall of the shell, and the support point is arranged on the inner wall of the front mixing cavity close to the rear mixing cavity, and the support point is arranged as a step surface protruding inwardly.

[0009] Preferably, the heating element is in contact with the gas mixing plate.

[0010] Preferably, a heating device protection pipeline is arranged in the rear end mixing chamber, the heating element is arranged in the heating device protection pipeline, and the heating device protection pipeline is in contact with the gas mixing plate.

[0011] Preferably, the rear end of the shell is connected to the rear flange, and a sealing gasket is arranged between the rear end of the shell and the rear flange; the support member and the heating equipment protection pipeline are both connected to the rear flange.

[0012] Preferably, the front end of the shell is connected to the front flange, the gas intake pipeline is connected to the front flange, and is connected to the pressure vessel; and a sewage inspection pipeline is arranged at the bottom of the shell.

[0013] A method for using the water vapor and gas mixing device applied to the SOEC system based on the above-mentioned method comprises the following steps: Passing water vapor generated by a water vapor generator into the water vapor inlet pipeline, wherein the temperature of the water vapor is a first set temperature; The gas inlet pipeline includes a first gas inlet pipeline and a second gas inlet pipeline, CO2 gas enters the front-end mixing chamber through the first gas inlet pipeline, and H2 gas enters the front-end mixing chamber through the second gas inlet pipeline, so that the water vapor, the CO2 gas and the H2 gas are mixed for the first time in the front-end mixing chamber; The mixed gas after the first mixing arrives in the rear mixing chamber, and is mixed for the second time through the holes of the gas mixing plate, and the mixed gas is heated to a second set temperature by the heating element.

[0014] Preferably, after the heating element heats the mixed gas to the second set temperature, the following steps are further included: The mixed gas passes through the mixed gas outlet pipeline and enters the coil, and then the mixed gas is heated to a third set temperature by the heating tube, and then the mixed gas is passed into the fuel cell stack, and then electrolyzed to produce CO and O2; The first set temperature is 120°C, the second set temperature is 200°C, and the third set temperature is 750°C.

[0015] The present invention adopts the above technical solution, which has the following advantages: 1. The water vapor and gas mixing device for use in the SOEC system provided by the present invention has a reasonable structure, an efficient gas mixing effect and a heating function; it can be applied to a variety of applications and provide effective technical support for gas detection, gas analysis and gas preparation.

[0016] 2. The water vapor and gas mixing device and the use method thereof provided by the present invention for use in a SOEC system, by heating the mixed gas, is suitable for high-temperature gas mixing, improves the mixing quality of the mixed gas, prevents the mixed gas from condensing, and improves the utilization rate of water vapor materials; can prevent water vapor from condensing before entering the reactor stack, and avoids damage to the reactor stack; and adopts a multi-stage mixing method, through the first mixing of water vapor and gas in the front mixing cavity and the second mixing at the gas mixing plate, the mixed gas causes irregular movement, increases the disturbance of the mixed gas, is conducive to the effective and uniform mixing of water vapor and gas, and prevents the state of the gas from changing in the process, improves the gas mixing effect and quality, and improves the utilization rate of the stack; can ensure that water vapor does not condense while being evenly mixed with other gases, and the flow rate is stable, which is conducive to improving the efficiency and stability of the SOEC system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the internal structure of a water vapor and gas mixing device applied to a SOEC system provided by one embodiment of the present invention.

[0018] Figure 2 It is a schematic structural diagram of a gas mixing plate of a water vapor and gas mixing device applied to a SOEC system provided by one embodiment of the present invention.

[0019] Figure 3 It is a schematic diagram of the external structure of a water vapor and gas mixing device applied to a SOEC system provided by one embodiment of the present invention.

[0020] Figure 4 It is a flow chart of a method for using a water vapor and gas mixing device applied to a SOEC system provided by one embodiment of the present invention.

[0021] Figure 5 It is a flow chart of a method for using a water vapor and gas mixing device applied to a SOEC system provided by another embodiment of the present invention.

[0022] Markings in the accompanying drawings: 101. Shell, 102. Rear mixing chamber, 103. Rear flange, 1. Water vapor inlet pipeline, 2. First gas inlet pipeline, 3. Second gas inlet pipeline, 4. Sewage inspection pipeline, 5. Mixed gas outlet pipeline, 6. Heating element, 7. Gas mixing plate, 701. Hole, 8. Support point, 9. Heating equipment protection pipeline, 10. Sealing gasket, 11. Front mixing chamber, 12. Support. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the system or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. The direction of the arrow in the figure represents the direction of liquid flow.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "assembly", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The present invention provides a water vapor and gas mixing device applied to a SOEC system and a method for using the same. The device adopts a multi-stage mixing method, wherein the water vapor and gas are mixed for the first time in a front mixing cavity and for the second time at a gas mixing plate, and the mixed gas is heated, thereby preventing the water vapor from condensing before entering a reactor stack and thus preventing damage to the reactor stack. The device is also beneficial for uniform mixing of the water vapor and gas, thereby improving the utilization rate of the reactor stack.

[0027] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0028] Example 1 Please refer to Figures 1 to 3 The water vapor and gas mixing device for SOEC system provided in this embodiment includes a shell 101, a gas mixing plate 7 and a heating element 6. The interior of the shell 101 is set as a cavity, and the cavity is provided with a front-end mixing cavity 11 and a rear-end mixing cavity 102; the rear end of the shell 101 is provided with a mixed gas outlet pipeline 5; the front end of the shell 101 is provided with a water vapor inlet pipeline 1 and a gas inlet pipeline; the gas mixing plate 7 is arranged in the rear-end mixing cavity 102, and a hole 701 is opened on the gas mixing plate 7; the heating element 6 is arranged in the rear-end mixing cavity 102.

[0029] The water vapor and gas mixing device of this embodiment has two mixing structures, namely, the front mixing chamber 11 and the gas mixing plate 7. The lead wire of the heating element 6 can extend to the rear end of the shell 101. The irregular movement of the gas is changed by the holes 701 of the gas mixing plate 7 to increase the mixing effect and mixing efficiency of the water vapor and gas. The material of the shell 101 can be selected from high-temperature stainless steel such as 625 and 316L.

[0030] Among them, the gas intake pipeline can be set to at least two, for example, the gas intake pipeline can include a first gas intake pipeline 2 and a second gas intake pipeline 3. The front and rear directions refer to Figure 1 The steam inlet pipe 1 can be connected to the front top wall of the housing 101. The heating element 6 can be provided with a heating resistor or a heating module for adjusting the temperature.

[0031] Specifically, the gas mixing plate 7 is provided with at least two holes 701 , and the number of gas mixing plates 7 is at least two.

[0032] The hole 701 can be set as a circular hole. The plurality of holes 701 can be evenly distributed. The gas mixing plate 7 can be set as a vertical circular stainless steel plate. The plurality of gas mixing plates 7 are arranged in parallel, and the plate surfaces thereof are perpendicular to the front-rear direction. The number of the gas mixing plates 7 can be adjusted accordingly according to the actual situation and the pressure composition of the gas.

[0033] Specifically, a support member 12 is disposed in the rear mixing chamber 102, and a plurality of gas mixing plates 7 are connected via the support member 12. The support member 12 can improve the use efficiency of the water vapor and gas mixing device and reduce the difficulty of subsequent maintenance.

[0034] There may be at least two support members 12, and the plurality of support members 12 are evenly distributed and connected to the gas mixing plate 7. The support members 12 may be welded in the holes 701 of the gas mixing plate 7.

[0035] Specifically, a support point 8 is disposed on the inner wall of the shell 101 , and the support point 8 is disposed on the inner wall of the front mixing cavity 11 close to the rear mixing cavity 102 , and the support point 8 is disposed as a step surface protruding inwardly.

[0036] The supporting point 8 may be set as an annular step surface, and the supporting point 8 provides a standard reference point for the installation and positioning of the multi-layer gas mixing plate 7 in the housing 101 .

[0037] Specifically, the heating element 6 is in contact with the gas mixing plate 7 .

[0038] Specifically, a heating device protection pipeline 9 is disposed in the rear end mixing chamber 102 , the heating element 6 is disposed in the heating device protection pipeline 9 , and the heating device protection pipeline 9 is in contact with the gas mixing plate 7 .

[0039] The heating element 6 can be sealed and arranged in the heating device protection pipeline 9. At least two heating elements 6 can be arranged, and the plurality of heating elements 6 and the heating device protection pipeline 9 sleeved outside thereof can be evenly distributed and contact the gas mixing plate 7.

[0040] Specifically, the rear end of the shell 101 is connected to the rear flange 103, and a sealing gasket 10 is arranged between the rear end of the shell 101 and the rear flange 103; the support member 12 and the heating equipment protection pipeline 9 are both connected to the rear flange 103. The rear flange 103 also facilitates the subsequent installation and maintenance of the water vapor and gas mixing device, thereby greatly improving the reusability and maintainability of the water vapor and gas mixing device.

[0041] The mixed gas outlet pipeline 5 can be connected to the rear flange 103. The sealing gasket 10 can be set to be annular, which can withstand axial pressure and withstand a high temperature of 200°C. The rear end of the housing 101 is sealed and connected to the rear flange 103 through the sealing gasket 10. The heating equipment protection pipeline 9 can be welded to the rear flange 103.

[0042] Specifically, the front end of the shell 101 is connected to the front flange, the gas intake pipeline is connected to the front flange, and is connected to the pressure vessel; the bottom of the shell 101 is provided with a sewage inspection pipeline 4.

[0043] The sewage inspection pipeline 4 may be connected to the bottom side wall of the rear mixing chamber 102. The housing 101 and the front flange and the rear flange 103 may be welded or connected by bolts.

[0044] The front ends of the first gas inlet pipeline 2 and the second gas inlet pipeline 3 can be respectively installed with mass flow meters, and the flow rate of the inlet gas can be controlled by the mass flow meters. Figure 1 Left direction shown.

[0045] A solenoid valve can be installed at the lower end of the sewage inspection pipeline 4 for timed drainage.

[0046] Example 2 Please refer to Figures 1 to 4 This embodiment provides a method for using the water vapor and gas mixing device applied to the SOEC system as described in Example 1, specifically for electrolyzing CO2, comprising the following steps: Step S1, passing the water vapor generated by the water vapor generator into the water vapor inlet pipeline 1, and the temperature of the water vapor is a first set temperature; Step S2, the gas intake pipeline includes a first gas intake pipeline 2 and a second gas intake pipeline 3, CO2 gas enters the front-end mixing chamber 11 through the first gas intake pipeline 2, and H2 gas enters the front-end mixing chamber 11 through the second gas intake pipeline 3, so that water vapor, CO2 gas and H2 gas are mixed for the first time in the front-end mixing chamber 11; Step S3, the mixed gas after the first mixing reaches the rear mixing chamber 102, and is mixed for the second time through the holes 701 of the gas mixing plate 7, and the mixed gas is heated to a second set temperature by the heating element 6.

[0047] The heating temperature of the mixed gas of the water vapor and gas mixing device can be controlled at 30°C-250°C.

[0048] Please refer to Figures 1 to 3 and Figure 5 Specifically, after the heating element 6 heats the mixed gas to the second set temperature, the following steps are also included: Step S4, the mixed gas passes through the mixed gas outlet pipeline 5 and enters the coil, and then the mixed gas is secondary heated to a third set temperature through the heating tube, and then the mixed gas is passed into the fuel cell stack, and then electrolyzed to produce CO and O2; The first set temperature is 120°C, the second set temperature is 200°C, and the third set temperature is 750°C.

[0049] It can be seen that the water vapor generator generates water vapor and enters the water vapor inlet pipeline 1. At this time, the temperature of the water vapor can be 120°C. CO2 gas enters the front-end mixing chamber 11 through the first gas inlet pipeline 2 and H2 gas enters the front-end mixing chamber 11 through the second gas inlet pipeline 3. CO2 and H2 can both be external gas sources. Water vapor and CO2 and H2 gases complete preliminary mixing in the front-end mixing chamber 11, and the mixed gas in the front-end mixing chamber 11 is further sent to the gas mixing plate 7 by the pressure of the gas inlet pipeline, and is secondary mixed through the hole 701; at the same time, the heating element 6 sealed in the heating equipment protection pipeline 9 heats the mixed gas entering the rear-end mixing chamber 102, and enters the subsequent process through the mixed gas outlet pipeline 5. During the heating process, the gas can be prevented from leaking from the installation position of the heating element 6 and the water vapor and gas mixing device, and the water vapor and gas mixing device can also be protected from being corroded by the mixed gas. Non-process raw materials generated by the water vapor and gas mixing device or generated by water vapor condensation during the above mixing and heating process can be discharged through the sewage inspection pipeline 4. The sewage inspection pipe 4 can also be used as a gas inspection port. For example, it can be used to perform sewage inspection on a water vapor and gas mixing device while providing a mixed gas sample for detecting gas components.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water vapor and gas mixing device used in a SOEC system, characterized in that: include: A shell (101) is provided with a cavity inside, wherein the cavity is provided with a front mixing cavity (11) and a rear mixing cavity (102); a mixed gas outlet pipeline (5) is provided at the rear end of the shell (101); and a water vapor inlet pipeline (1) and a gas inlet pipeline are provided at the front end of the shell (101); A gas mixing plate (7) is arranged in the rear mixing cavity (102), and a hole (701) is provided on the gas mixing plate (7); A heating element (6) is arranged in the rear mixing cavity (102).

2. The water vapor and gas mixing device used in the SOEC system according to claim 1, characterized in that: The gas mixing plate (7) is provided with at least two holes (701), and the gas mixing plate (7) is provided in at least two forms.

3. The water vapor and gas mixing device used in the SOEC system according to claim 2, characterized in that: A support member (12) is provided in the rear end mixing cavity (102), and a plurality of the gas mixing plates (7) are connected via the support member (12).

4. The water vapor and gas mixing device used in the SOEC system according to claim 3, characterized in that: A support point (8) is provided on the inner wall of the shell (101); the support point (8) is provided on the inner wall of the front mixing cavity (11) close to the rear mixing cavity (102); the support point (8) is provided as a stepped surface protruding inwardly.

5. The water vapor and gas mixing device for SOEC system according to claim 1, characterized in that: The heating element (6) is in contact with the gas mixing plate (7).

6. The water vapor and gas mixing device for SOEC system according to claim 3, characterized in that: A heating device protection pipeline (9) is arranged in the rear end mixing chamber (102), the heating element (6) is arranged in the heating device protection pipeline (9), and the heating device protection pipeline (9) is in contact with the gas mixing plate (7).

7. The water vapor and gas mixing device used in the SOEC system according to claim 6, characterized in that: The rear end of the shell (101) is connected to a rear flange (103), and a sealing gasket (10) is provided between the rear end of the shell (101) and the rear flange (103); the support member (12) and the heating equipment protection pipeline (9) are both connected to the rear flange (103).

8. The water vapor and gas mixing device used in a SOEC system according to any one of claims 1 to 7, characterized in that: The front end of the shell (101) is connected to the front flange, the gas intake pipeline is connected to the front flange and is connected to the pressure vessel; and a sewage inspection pipeline (4) is arranged at the bottom of the shell (101).

9. A method for using the water vapor and gas mixing device for SOEC system according to any one of claims 1 to 8, characterized in that: The following steps are involved: Passing water vapor generated by a water vapor generator into the water vapor inlet pipeline (1), wherein the temperature of the water vapor is a first set temperature; The gas intake pipeline includes a first gas intake pipeline (2) and a second gas intake pipeline (3), CO2 gas enters the front-end mixing chamber (11) through the first gas intake pipeline (2), and H2 gas enters the front-end mixing chamber (11) through the second gas intake pipeline (3), so that the water vapor, the CO2 gas and the H2 gas are mixed for the first time in the front-end mixing chamber (11); The mixed gas after the first mixing is delivered to the rear mixing chamber (102) and mixed for the second time through the holes (701) of the gas mixing plate (7), while the mixed gas is heated to a second set temperature by the heating element (6).

10. The method for using the water vapor and gas mixing device applied to the SOEC system according to claim 9, characterized in that: After the heating element (6) heats the mixed gas to the second set temperature, the following steps are further included: The mixed gas passes through the mixed gas outlet pipeline (5) and enters the coil, and then the mixed gas is heated to a third set temperature by the heating tube, and then the mixed gas is passed into the fuel cell stack, and then electrolyzed to produce CO and O2; The first set temperature is 120°C, the second set temperature is 200°C, and the third set temperature is 750°C.

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