KR102483560B1 - Convergence system comprising molten carbonate fuel cell and solid oxide electrolysis cell - Google Patents

Abstract

The present invention relates to a convergence system of a molten carbonate type fuel cell and a solid oxide water electrolytic cell, and the convergence system of one embodiment relates to the chemistry of oxygen supplied to a cathode input terminal (CI1) and hydrogen supplied to an anode input terminal (AI1). A molten carbonate fuel cell that produces electricity by reaction, a first valve that distributes the anode exhaust gas of the molten carbonate fuel cell to a combustor and a solid oxide water electrolysis cell, and moisture in the exhaust gas distributed from the first valve and a solid oxide water electrolytic cell producing oxygen and hydrogen by electrolysis, and the first valve adjusts a distribution ratio between the combustor and the solid oxide water electrolytic cell according to operating conditions.

Description

Convergence system of molten carbonate type fuel cell and solid oxide water electrolysis cell

The present invention relates to a convergence system of a molten carbonate fuel cell and a solid oxide water electrolysis cell, and more particularly, to a molten carbonate fuel cell (MCFC) and a solid oxide water electrolysis cell (Solid Oxide Electrolysis Cell). , SOEC) relates to a convergence system of a molten carbonate fuel cell and a solid oxide water electrolysis cell driven in an organic relationship with each other.

In general, a fuel cell refers to a cell that directly converts chemical energy generated by oxidation into electrical energy. Unlike chemical cells, in fuel cells, reactants are continuously supplied from the outside and reaction products are removed from the outside. The most representative type of fuel cell is a hydrogen-oxygen fuel cell, and this fuel cell is divided into a high-temperature fuel cell and a low-temperature fuel cell according to the operating temperature.

Household and industrial fuel cell systems generally perform cogeneration that simultaneously produces power and heat. The fuel cell system uses natural gas as a fuel, extracts hydrogen contained in natural gas in a reformer, and supplies it to a fuel cell stack. The fuel cell stack produces electricity from hydrogen through an electrochemical reaction, and the waste heat generated in the power generation process is recovered by a heat recovery device, stored in a heat storage tank, and then used as a heat source for heating or hot water through an auxiliary boiler.

Hereinafter, the operating principle of the fuel cell will be briefly described.

Hydrogen extracted from natural gas passes through the fuel cell's anode and oxygen passes through the cathode. Hydrogen and oxygen react electrochemically to produce water and heat. At this time, as the electrons pass through the electrolyte, DC electricity flows through the electrodes, and the DC electricity is used as the power of the DC motor or converted into AC electricity by the power converter. The heat generated from the fuel cell can be used to generate steam or as heat for cooling and heating, and is discharged as exhaust heat when not in use.

Fuel cells are classified according to the type of electrolyte. A fuel cell that uses molten carbonate as an electrolyte and operates at a high temperature of 650° C. is called a Molten Carbonate Fuel Cell (MCFC).

Molten carbonate fuel cells are used for power generation because of their high efficiency and long-term operation performance compared to polymer electrolyte membrane fuel cells (PEMFCs) used for households, buildings, and vehicles. In addition, since the molten carbonate fuel cell can produce a large capacity compared to the size of the facility and has a longer lifespan than other fuel cells, various studies have been conducted to use it as a driving source for ships.

The present invention is a convergence system of a molten carbonate fuel cell and a solid oxide water electrolytic cell that organically combines a molten carbonate fuel cell and a solid oxide water electrolytic cell to circulate and use fuel required for driving and by-products generated after driving. Its purpose is to provide

Another object of the present invention is to increase system efficiency by optimizing configurations required for system operation.

The problems of the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

In order to solve the above problems, the present invention provides a molten carbonate type fuel cell that generates electricity by a chemical reaction between oxygen supplied to the cathode input terminal (CI1) and hydrogen supplied to the anode input terminal (AI1), and the molten carbonate type fuel A first valve that distributes the exhaust gas from the anode output terminal (AO1) of the battery to the combustor and the solid oxide water electrolytic cell, and a solid oxide water electrolytic cell that produces oxygen and hydrogen by electrolyzing the moisture in the exhaust gas distributed from the first valve A convergence system of a molten carbonate type fuel cell and a solid oxide water electrolytic cell including a is proposed as an embodiment.

The first valve adjusts the distribution ratio between the combustor and the solid oxide water electrolysis cell according to operating conditions.

In the operating condition, the exhaust gas of the anode output stage AO1 is adjusted so that the solid oxide water electrolytic cell operates at the maximum. It is distributed to the solid oxide water electrolysis cell, and the remaining exhaust gas is distributed to the combustor.

A first filter disposed between the anode output terminal AO1 and the first valve, and removing the electrolyte included in the exhaust gas of the anode output terminal AO1 may be further included.

The combustor heats external air using unreacted fuel contained in the exhaust gas of the first valve, and the heated external air is supplied to a cathode input terminal of the molten carbonate fuel cell.

The exhaust gas from the anode output stage AO2 of the solid oxide water electrolysis cell is joined to the external air and supplied to the combustor.

The present invention is a molten carbonate fuel cell that generates electricity by a chemical reaction between oxygen supplied to a cathode input stage (CI1) and hydrogen supplied to an anode input stage (AI1), and an anode output stage (AO1) of the molten carbonate fuel cell. A solid oxide water electrolysis cell that electrolyzes moisture contained in exhaust gas to produce oxygen and hydrogen, and a cathode output terminal (CO1) of the molten carbonate type fuel cell generates exhaust gas from an anode input terminal (AI2) of the solid oxide water electrolytic cell As another embodiment, a convergence system of a molten carbonate type fuel cell and a solid oxide water electrolysis cell including a second valve distributing to a hot box of the solid oxide water electrolysis cell is proposed.

The second valve according to another embodiment adjusts the distribution ratio between the anode input terminal AI2 of the solid oxide water electrolytic battery and the hot box of the solid oxide water electrolytic battery according to operating conditions.

Waste heat from the hot box of the solid oxide water electrolytic cell is supplied to a heat exchanger and used for heating external fuel.

A second filter disposed between the cathode output CO1 and the second valve and removing electrolyte included in exhaust gas from the cathode output CO1 may be further included.

The present invention relates to a molten carbonate fuel cell that generates electricity by a chemical reaction between oxygen supplied to a cathode input terminal (CI1) and hydrogen supplied to an anode input terminal (AI1), and an anode output terminal (AO1) of the molten carbonate fuel cell. ) A solid oxide water electrolysis cell that electrolyzes moisture contained in exhaust gas to produce oxygen and hydrogen, and a cathode output stage (CO1) exhaust gas of the molten carbonate type fuel cell is heated with the solid oxide water electrolytic cell and external fuel As another embodiment, a convergence system of a molten carbonate fuel cell and a solid oxide water electrolytic cell including a second valve for distribution to a heat exchanger is proposed.

The second valve adjusts the distribution ratio between the anode input stage AI2 of the solid oxide water electrolytic cell and the heat exchanger according to operating conditions.

The second valve transfers exhaust gas from the cathode output stage (CO1) of the molten carbonate type fuel cell to the anode input stage (AI2) of the solid oxide water electrolysis cell, the hot box of the solid oxide water electrolysis cell, and the heat exchanger according to operating conditions. allocate by

A second filter disposed between the cathode output CO1 and the second valve, and removing the electrolyte included in the exhaust gas of the cathode output CO1 is further included.

The present invention is a molten carbonate fuel cell that generates electricity by a chemical reaction between oxygen supplied to a cathode input stage (CI1) and hydrogen supplied to an anode input stage (AI1), and an anode output stage (AO1) of the molten carbonate fuel cell. A combustor for heating external air using unreacted fuel contained in the exhaust gas, a common heater for heating external air using the heat contained in the exhaust gas of the anode output terminal (AO1) of the molten carbonate fuel cell, the molten carbonate Oxygen and hydrogen are produced by electrolyzing moisture in the exhaust gas of the anode output stage (AO1) passing through the first valve and the common heater to distribute the exhaust gas from the anode output stage (AO1) of the fuel cell to the combustor and the common heater. A convergence system of a molten carbonate type fuel cell and a solid oxide water electrolytic cell including a solid oxide water electrolytic cell to do is proposed as another embodiment.

The first valve adjusts the distribution ratio between the combustor and the solid oxide water electrolysis cell according to operating conditions.

A third valve for distributing external air to the combustor and the shared heater may be further included.

Exhaust gas from the anode output terminal (AO2) of the solid oxide water electrolysis cell is joined to external air distributed from the third valve and supplied to the combustor.

External air heated by the common heater and the combustor is supplied to a cathode input terminal of the molten carbonate fuel cell.

According to an embodiment of the present invention, fuel required for driving the molten carbonate fuel cell and the solid oxide water electrolytic cell and by-products generated after driving are circulated for use, thereby minimizing the amount of fuel required for hydrogen and power production.

According to an embodiment of the present invention, hydrogen production efficiency can be increased by supplying unreacted hydrogen contained in exhaust gas of a molten carbonate fuel cell to a water electrolysis cell.

According to an embodiment of the present invention, energy consumption for maintaining operating conditions of the hot box can be minimized by supplying waste heat included in exhaust gas of the molten carbonate type fuel cell to the hot box of the solid oxide water electrolytic cell.

According to an embodiment of the present invention, the exhaust gas of the molten carbonate fuel cell is appropriately distributed to the combustor and the solid oxide water electrolytic cell using a control valve according to operating conditions, so that the operator's desired operation purpose or operation efficiency can be easily achieved. there is.

According to an embodiment of the present invention, the efficiency of the system can be increased by supplying waste heat contained in the exhaust gas of the molten carbonate fuel cell to a heat exchanger for heating external fuel.

According to an embodiment of the present invention, the waste heat included in the exhaust gas of the molten carbonate type fuel cell is appropriately distributed to the hot box and heat exchanger of the solid oxide water electrolysis cell using a control valve according to the operating conditions, so that the purpose of operation or operation desired by the driver Efficiency can be easily achieved.

According to an embodiment of the present invention, the exhaust gas of the molten carbonate type fuel cell is appropriately distributed to the solid oxide water electrolysis battery, the hot box of the solid oxide water electrolysis battery, and the heat exchanger using a control valve according to the operating conditions, so that the driver's desired operation purpose Alternatively, operation efficiency can be easily achieved.

According to an embodiment of the present invention, exhaust gas from a molten carbonate fuel cell is appropriately distributed to a combustor and a common heater for heating external air using a control valve according to operating conditions, so that the driver's desired operation purpose or operation efficiency can be easily achieved. can be achieved

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

1 is a block configuration diagram showing a convergence system of a molten carbonate fuel cell and a solid oxide water electrolysis cell according to an embodiment of the present invention.
2 is a block diagram showing a convergence system of a molten carbonate type fuel cell and a solid oxide water electrolysis cell according to another embodiment of the present invention.
3 is a block diagram showing a convergence system of a molten carbonate type fuel cell and a solid oxide water electrolysis cell according to another embodiment of the present invention.
4 is a block diagram illustrating a convergence system of a molten carbonate type fuel cell and a solid oxide water electrolysis cell according to another embodiment of the present invention.
5 is a block diagram showing a convergence system of a molten carbonate type fuel cell and a solid oxide water electrolysis cell according to another embodiment of the present invention.
6 is a block diagram illustrating a convergence system of a molten carbonate type fuel cell and a solid oxide water electrolytic cell according to another embodiment of the present invention.

Since the description of the present invention is only an embodiment for structural or functional description, the scope of the present invention should not be construed as being limited by the embodiments described in the text. That is, since the embodiment can be changed in various ways and can have various forms, it should be understood that the scope of the present invention includes equivalents capable of realizing the technical idea. In addition, since the object or effect presented in the present invention does not mean that a specific embodiment should include all of them or only such effects, the scope of the present invention should not be construed as being limited thereto.

Meanwhile, the meaning of terms described in this application should be understood as follows.

Terms such as "first" and "second" are used to distinguish one component from another, and the scope of rights should not be limited by these terms. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element.

It should be understood that when an element is referred to as being “connected” to another element, it may be directly connected to the other element, but other elements may exist in the middle. On the other hand, when an element is referred to as being "directly connected" to another element, it should be understood that no intervening elements exist. Meanwhile, other expressions describing the relationship between components, such as “between” and “immediately between” or “adjacent to” and “directly adjacent to” should be interpreted similarly.

Expressions in the singular number should be understood to include plural expressions unless the context clearly dictates otherwise, and terms such as “comprise” or “have” refer to an embodied feature, number, step, operation, component, part, or these. It should be understood that it is intended to indicate that a combination exists, and does not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

In each step, the identification code (eg, a, b, c, etc.) is used for convenience of explanation, and the identification code does not describe the order of each step, and each step clearly follows a specific order in context. Unless otherwise specified, it may occur in a different order than specified. That is, each step may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, unless defined otherwise. Terms defined in commonly used dictionaries should be interpreted as consistent with meanings in the context of the related art, and cannot be interpreted as having ideal or excessively formal meanings unless explicitly defined in the present application.

<First Embodiment>

1 is a block diagram showing a convergence system of a molten carbonate type fuel cell and a solid oxide water electrolytic cell according to a first embodiment.

The convergence system of the first embodiment includes a molten carbonate fuel cell (MCFC) 10, a valve system 20, a solid oxide water electrolysis cell (SOEC) 30, and an oxidizer 40. It includes, and may further include a compressor (50) and a reforming system (60).

The molten carbonate fuel cell 10 generates electricity through a chemical reaction between oxygen supplied to the cathode input terminal (Cathode In, CI1) and hydrogen supplied to the anode input terminal (Anode In, AI1).

A gas having the composition shown in [Table 1] (hereinafter referred to as 'anode exhaust gas') (anode off gas) is discharged from the anode output terminal (Anode Out, AO1) of the molten carbonate fuel cell.

Temperature (℃) Composition (mole, %) H2 CO CO2 H2O N2 600 to 620 9-11 4 to 6 40-46 39~43 0.1

In addition, gas having the composition shown in [Table 2] (hereinafter referred to as 'cathode exhaust gas') (cathode off gas) is discharged from the cathode output terminal CO1 of the molten carbonate fuel cell.

Temperature (℃) Composition (mole, %) CO2 H2O N2 O2 360~380 4 to 5 17-20 66-69 8 to 10

The valve system 20 includes a first valve 22 for distributing the anode exhaust gas of the molten carbonate fuel cell to the combustor 40 and the solid oxide water electrolysis cell 30 . The anode exhaust gas of the molten carbonate type fuel cell is distributed to the cathode input terminal CI2 of the solid oxide water electrolysis cell 30 by the first valve 22 .

The first valve 22 adjusts the distribution ratio to the solid oxide water electrolytic cell 30 and the combustor 40 according to operating conditions. The driving conditions may be automatically generated by analyzing and processing information input by a driver or collected by various sensors using a predetermined algorithm.

As an example of the operating conditions, the amount of hydrogen to be produced in the solid oxide water electrolytic cell 30 may be mentioned. That is, under operating conditions in which the operation of the solid oxide water electrolytic cell 30 is given top priority, the first valve 22 controls the exhaust gas of the anode output terminal AO1 so that the solid oxide water electrolytic cell 30 operates at the maximum. It is distributed to the solid oxide water electrolytic cell (30), and the remaining exhaust gas is distributed to the combustor (40).

As another example of the operating condition, an operating condition for stopping the operation of the solid oxide water electrolytic cell 30 may be set. This is because there may be a case in which operation must be stopped for maintenance due to a temporary problem occurring in the solid oxide water electrolytic cell 30 or functional deterioration in a consumable component. In this case, the first valve 22 makes the distribution to the solid oxide water electrolysis cell 30 zero and removes all of the exhaust gas from the anode output stage AO1. Distributed to the combustor (40).

The valve system 20 may further include a first filter 21 disposed between the anode output terminal AO1 of the molten carbonate fuel cell and the first valve 22 . The first filter 21 removes the electrolyte contained in the exhaust gas of the anode output terminal AO1. This is because the viscous electrolyte contained in the exhaust gas of the anode output stage AO1 is continuously accumulated in the first valve 22 and the solid oxide water electrolytic cell at the rear stage, resulting in deterioration of function. As the first filter 21, an electrostatic filter made of ceramic or metal may be used. In addition, one of HEPA, ULPA, chloride, medium, and pocket filters may be used.

The solid oxide water electrolysis cell 30 produces oxygen and hydrogen by electrolyzing moisture (H2O) of the exhaust gas distributed from the first valve 22.

The anode exhaust gas of the molten carbonate type fuel cell is supplied to the cathode input terminal CI2 of the solid oxide water electrolysis cell 30, and the anode exhaust gas of the molten carbonate type fuel cell is supplied to the anode input terminal AI2 of the solid oxide water electrolysis cell 30. Exhaust gas is supplied. More specifically, moisture (H2O) among the anode exhaust gas of the molten carbonate fuel cell is supplied to the cathode input terminal CI2 of the solid oxide water electrolytic cell 30, and the anode input terminal of the solid oxide water electrolysis battery 30 Oxygen (O2) in the cathode exhaust gas of the molten carbonate type fuel cell is supplied to (AI2).

Due to the electrolytic action of the solid oxide water electrolytic cell 30, gas containing oxygen (O2) is discharged through the anode output terminal (AO2), and gas containing hydrogen (H2) is discharged through the cathode output terminal (CO2). do.

The combustor 40 heats external air (OA) using unreacted fuel included in the anode exhaust gas of the molten carbonate fuel cell distributed by the first valve 22 . Unreacted fuel may include hydrogen (H2). External air heated by the combustor 40 is supplied to the cathode input terminal CI1 of the molten carbonate fuel cell 10 .

Exhaust gas from the anode output stage AO2 of the solid oxide water electrolytic cell 30 may be supplied to the combustor 40 after being joined to the external air. The combustor 40 may increase combustion efficiency by using oxygen (O2) included in the exhaust gas of the anode output stage (AO2).

The compressor 50 compresses the exhaust gas of the cathode output terminal (CO2) of the solid oxide water electrolysis cell 30 . The compressed gas (CG) contains a large amount of hydrogen and can be later used as a fuel for the molten carbonate fuel cell 10 or stored in a hydrogen tank (not shown in the drawing) provided at a later stage.

The reforming system 60 is a heat exchanger 62 for raising the temperature of external fuel such as natural gas (NG) and propane gas, and reforming the heated external fuel to obtain hydrogen (H2). It includes a reformer 63 for producing hydrogen, and a super heater 61 for preheating the produced hydrogen to an appropriate temperature. The hydrogen fuel produced by the reforming system 60 is supplied to the anode input stage AI1 of the molten carbonate fuel cell 10 .

As an optional embodiment (OE1, optional embodiment 1), a portion of the exhaust gas from the cathode of the molten carbonate fuel cell 10 may be diverted and supplied to the superheater 61 of the reforming system 60. The superheater 61 uses heat contained in the exhaust gas from the cathode of the molten carbonate fuel cell 10 to increase the temperature of the gas supplied from the reformer to the anode input terminal AI1.

As an optional embodiment 2 (OE2), a part of the heat generated in the superheater 61 is distributed to the heat exchanger 62, and the external fuel (NG + H O mixed gas) introduced into the heat exchanger 62 temperature can be raised.

As an optional embodiment 3 (OE3), the waste heat of the hot box 31 of the solid oxide water electrolytic cell is supplied to the heat exchanger 62 of the reforming system 60 and used for heating external fuel. there is.

<Second Embodiment>

2 is a block diagram showing a convergence system of a molten carbonate type fuel cell and a solid oxide water electrolytic cell according to a second embodiment.

The convergence system of the second embodiment includes a molten carbonate fuel cell 10, a valve system 20-1, a solid oxide water electrolytic cell 30, and a combustor 40, and includes a compressor 50 and a reforming system ( 60) may be further included.

The molten carbonate type fuel cell 10 is replaced by the description of the first embodiment.

The valve system 20-1 distributes the cathode exhaust gas of the molten carbonate type fuel cell 10 to the solid oxide water electrolysis cell 30 and the hot box 31 of the solid oxide water electrolysis cell. 1) includes Some of the exhaust gas from the cathode of the molten carbonate fuel cell is distributed to the anode input stage AI2 of the solid oxide water electrolysis cell 30 by the second valve 24-1. More specifically, oxygen from the cathode exhaust gas of the molten carbonate type fuel cell is supplied to the anode input terminal AI2 of the solid oxide water electrolysis cell 30, and the molten carbonate type fuel cell is supplied to the hot box 31 of the solid oxide water electrolysis cell. Heat is mainly transferred from the cathode exhaust gas of the fuel cell.

The second valve 24-1 adjusts the distribution ratio between the anode input terminal AI2 of the solid oxide water electrolytic battery 30 and the hot box 31 of the solid oxide water electrolytic battery according to operating conditions.

As an example of the operating conditions, the amount of hydrogen to be produced in the solid oxide water electrolytic cell 30 may be mentioned. That is, if the operating conditions give top priority to the operation of the solid oxide water electrolytic cell 30, the second valve 24-1 controls the exhaust gas of the cathode output stage (CO1) so that the solid oxide water electrolytic cell 30 operates at its maximum. It is distributed to the anode input terminal (AI2) of the solid oxide water electrolytic cell (30), and the remaining exhaust gas is distributed to the hot box (31) of the solid oxide water electrolytic cell (30).

The valve system 20 may further include a second filter 23 disposed between the cathode output stage CO1 of the molten carbonate fuel cell and the second valve 24-1. The second filter 23 removes the electrolyte contained in the exhaust gas of the cathode output stage CO1. This is because the viscous electrolyte contained in the exhaust gas of the cathode output stage (CO1) is continuously accumulated in the second valve 24-1 and the solid oxide water electrolysis cell 30 at the rear stage, resulting in a decrease in function. As the second filter 23, an electrostatic filter made of ceramic or metal may be used. In addition, one of HEPA, ULPA, chloride, medium, and pocket filters may be used.

The solid oxide water electrolytic cell 30 produces oxygen and hydrogen by electrolyzing moisture (H O ) contained in the anode exhaust gas of the molten carbonate type fuel cell.

The anode exhaust gas of the molten carbonate type fuel cell may be directly supplied to the cathode input terminal CI2 of the solid oxide water electrolysis cell 30 or may be supplied via the first valve 31 .

Other detailed descriptions of the solid oxide water electrolytic cell 30, the combustor 40, the compressor 50, and the reforming system 60 are the same as in Example 1.

In addition, optional embodiments of OE1 to OE3 may also be applied in the same manner as in the first embodiment.

<Third Embodiment>

3 is a block diagram showing a convergence system of a molten carbonate type fuel cell and a solid oxide water electrolytic cell according to a third embodiment.

The convergence system of the third embodiment includes a molten carbonate fuel cell 10, a valve system 20-2, a solid oxide water electrolysis cell 30, and a combustor 40, and includes a compressor 50 and a reforming system ( 60) may be further included.

The molten carbonate type fuel cell 10 is replaced by the description of the first embodiment.

The valve system 20-2 distributes the exhaust gas from the cathode output terminal (CO1) of the molten carbonate fuel cell 10 to the solid oxide water electrolysis cell 30 and the heat exchanger 62 of the reforming system 60. Includes valve 24-2. Some of the exhaust gas from the cathode of the molten carbonate fuel cell is distributed to the anode input stage AI2 of the solid oxide water electrolysis cell 30 by the second valve 24-2. More specifically, oxygen from the cathode exhaust gas of the molten carbonate type fuel cell is supplied to the anode input terminal AI2 of the solid oxide water electrolysis cell 30, and the molten carbonate type heat exchanger 62 of the reforming system 60 Heat is mainly transferred through the cathode exhaust gas of the fuel cell.

The second valve 24-2 adjusts the distribution ratio of the solid oxide water electrolytic cell 30 and the reforming system 60 to the heat exchanger 62 according to operating conditions.

As an example of the operating conditions, the amount of hydrogen to be produced in the solid oxide water electrolytic cell 30 may be mentioned. That is, if the operating conditions give top priority to the operation of the solid oxide water electrolytic cell 30, the second valve 24-2 controls the exhaust gas of the cathode output stage (CO1) so that the solid oxide water electrolytic cell 30 operates at its maximum. The solid oxide water electrolysis cell 30 is distributed to the anode input stage AI2, and the remaining exhaust gas is distributed to the heat exchanger 62 of the reforming system 60.

As another example of the operating condition, an operating condition for stopping the operation of the solid oxide water electrolytic cell 30 may be set. That is, the first valve 24-2 makes the distribution of the solid oxide water electrolytic cell 30 to the anode input terminal AI2 zero and removes all of the exhaust gas from the anode output terminal AO1. Distributed to the heat exchanger (62).

The valve system 20-2 may further include a second filter 23 disposed between the cathode output stage CO1 of the molten carbonate fuel cell and the second valve 24-2. The role of the second filter 23 is the same as that of the second embodiment.

The solid oxide water electrolytic cell 30 produces oxygen and hydrogen by electrolyzing moisture (H O ) contained in the anode exhaust gas of the molten carbonate type fuel cell.

The anode exhaust gas of the molten carbonate type fuel cell may be directly supplied to the cathode input terminal CI2 of the solid oxide water electrolysis cell 30 or may be supplied via the first valve 31 . Other detailed descriptions of the solid oxide water electrolytic cell 30 are the same as those in Example 1 or Example 2.

The combustor 40, the compressor 50, and the reforming system 60 are also the same as in Example 1 or Example 2.

In addition, optional embodiments of OE1 to OE3 may also be applied in the same manner as in the first embodiment.

<Fourth Embodiment>

4 is a block diagram illustrating a convergence system of a molten carbonate type fuel cell and a solid oxide water electrolytic cell according to a fourth embodiment.

The convergence system of the fourth embodiment includes a molten carbonate fuel cell 10, a valve system 20-3, a solid oxide water electrolysis cell 30, and a combustor 40, and includes a compressor 50 and a reforming system ( 60) may be further included.

The molten carbonate type fuel cell 10 is replaced by the description of the first embodiment.

The valve system 20-3 transfers exhaust gas from the cathode output stage (CO1) of the molten carbonate fuel cell 10 to the solid oxide water electrolysis cell 30, the hot box 31 of the solid oxide water electrolysis cell 30, and and a second valve 24-3 distributing to the heat exchanger 62 of the reforming system 60.

The second valve 24-3 is configured to supply the solid oxide water electrolysis battery 30, the hot box 31 of the solid oxide water electrolysis battery 30, and the heat exchanger 62 of the reforming system 60 according to operating conditions. Adjust the distribution ratio.

As an example of the operating conditions, the amount of hydrogen to be produced in the solid oxide water electrolytic cell 30 may be mentioned. That is, if the operating conditions give top priority to the operation of the solid oxide water electrolytic cell 30, the second valve 24-2 controls the exhaust gas of the cathode output stage (CO1) so that the solid oxide water electrolytic cell 30 operates at its maximum. Distributed to the anode input stage (AI2) of the solid oxide water electrolysis cell (30), and distributes the remaining exhaust gas to the hot box (31) of the solid oxide water electrolysis cell (30) and the heat exchanger (62) of the reforming system (60). do. Here, the distribution ratio of the remaining exhaust gas to the hot box 31 and the heat exchanger 62 may also be adjusted according to various sub-operation conditions.

As another example of the operating condition, an operating condition for stopping the operation of the solid oxide water electrolytic cell 30 may be set. That is, the first valve 24-2 makes the distribution between the anode input stage AI2 and the hot box 31 of the solid oxide water electrolytic cell 30 zero, and exhausts all of the exhaust gas from the anode output stage AO1. Distributed to the heat exchanger (62).

Descriptions of other technical components except for the second valve 24-3 are the same as those of the second or third embodiment.

<Fifth Embodiment>

5 is a block diagram showing a convergence system of a molten carbonate type fuel cell and a solid oxide water electrolytic cell according to a fifth embodiment.

The convergence system of the fifth embodiment includes a molten carbonate fuel cell 10, a valve system 20-4, a solid oxide water electrolysis cell 30, a combustor 40, and a common heater 70, and a compressor ( 50) and a reforming system 60 may be further included.

The molten carbonate type fuel cell 10 is replaced by the description of the first embodiment.

The valve system 20-4 includes a first valve 22-4 for distributing the anode exhaust gas of the molten carbonate fuel cell to the combustor 40 and the common heater 70. The anode exhaust gas of the molten carbonate type fuel cell is supplied to the cathode input terminal CI2 of the solid oxide water electrolysis cell 30 via the first valve 22-4 and the common heater 70.

The first valve 22-4 adjusts the distribution ratio to the common heater 70 and the combustor 40 according to operating conditions. An embodiment of the operating conditions may be applied in the same manner as the first embodiment except that the anode exhaust gas AO1 is supplied to the solid oxide water electrolytic cell 30 via the common heater 70 .

The valve system 20 - 4 may further include a first filter 21 disposed between the anode output terminal AO1 of the molten carbonate fuel cell and the first valve 22 .

The solid oxide water electrolytic cell 30 produces oxygen and hydrogen by electrolyzing moisture (H2O) in the anode exhaust gas of the molten carbonate fuel cell heated by the common heater 70.

The anode exhaust gas of the molten carbonate type fuel cell is supplied to the cathode input terminal CI2 of the solid oxide water electrolysis cell 30, and the anode exhaust gas of the molten carbonate type fuel cell is supplied to the anode input terminal AI2 of the solid oxide water electrolysis cell 30. Exhaust gas is supplied.

More specifically, moisture (H2O) among the anode exhaust gas of the molten carbonate fuel cell is supplied to the cathode input terminal CI2 of the solid oxide water electrolytic cell 30, and the anode input terminal of the solid oxide water electrolysis battery 30 Oxygen (O2) in the cathode exhaust gas of the molten carbonate type fuel cell is supplied to (AI2).

In addition, as described in Examples 2 to 4, the cathode exhaust gas of the molten carbonate fuel cell is discharged through the second filter 23 and/or the second valve 24, 24-1, 24-2, or 24-3. 1) may be supplied to the anode input terminal AI2 of the solid oxide water electrolytic cell 30.

Due to the electrolytic action of the solid oxide water electrolytic cell 30, gas containing oxygen (O2) is discharged through the anode output terminal (AO2), and gas containing hydrogen (H2) is discharged through the cathode output terminal (CO2). do.

The combustor 40 heats external air (OA) using unreacted fuel included in the anode exhaust gas of the molten carbonate fuel cell distributed by the first valve 22 . Unreacted fuel may include hydrogen (H2). The external air (OA) may be input to the combustor 40 after being primarily heated by the common heater 70 . In addition, exhaust gas from the anode output stage AO2 of the solid oxide water electrolysis cell 30 may be supplied to the combustor 40 after being joined to external air. The combustor 40 increases combustion efficiency by using oxygen (O2) included in the exhaust gas of the anode output stage (AO2).

External air heated by the combustor 40 is supplied to the cathode input terminal CI1 of the molten carbonate fuel cell 10 .

Compressor 50 and reforming system 60 are the same as those in Examples 1 to 4.

The common heater 70 serves at least two functions. First, the common heater 70 heats the anode exhaust gas of the molten carbonate type fuel cell supplied from the first valve 22-4. The heated molten carbonate fuel cell anode exhaust gas is transferred to the cathode input stage CI2 of the solid oxide water electrolysis cell. Second, the common heater 70 primarily preheats the outside air. The preheated outside air is moved to the combustor (40).

The common heater 70 may be a single heater, but may be divided into a first heater 71 and a second heater 72 . The first heater 71 heats the anode exhaust gas of the molten carbonate fuel cell supplied from the first valve 22-4, and the second heater 72 primarily preheats external air.

A common heat source for the first heater 71 and the second heater 72 may be used. When a common heat source is used, the first heater 71 and the second heater 72 may be disposed adjacent to each other or partitioned from each other by a partition wall to increase thermal efficiency.

<Sixth Embodiment>

6 is a block diagram showing a convergence system of a molten carbonate type fuel cell and a solid oxide water electrolytic cell according to a sixth embodiment.

The convergence system of the sixth embodiment includes a molten carbonate fuel cell 10, a valve system 20-4, a solid oxide water electrolysis cell 30, a combustor 40, a common heater 70, and a third valve 80. ), and may further include a compressor 50 and a reforming system 60.

Molten carbonate fuel cell 10, valve system 20-4, solid oxide water electrolysis cell 30, combustor 40, common heater 70, third valve 80, compressor 50, and reformer Since the description of the system 60 is the same as that of the fifth embodiment, only the third valve 80 will be described.

The third valve 80 is disposed between the outside air inlet and the common heater 70. Outside air is distributed to the combustor 40 and the common heater 70 by the third valve 80. A part of the outside air is branched by the third valve 80, joins the exhaust gas of the anode output terminal (AO2) of the solid oxide water electrolytic cell, and then enters the combustor 40. In addition, another part of the outside air is input to the combustor 40 after being preheated by the common heater 70 .

The third valve 80 may adjust the distribution ratio between the combustor 40 and the common heater 70 according to operating conditions.

As an example of the operating condition, a condition in which the outlet temperature of the combustor 40 is constantly maintained at a preset value is exemplified. That is, the third valve 80 monitors a temperature sensor (not shown) installed at the output end of the combustor 40 and increases the distribution ratio of external air flowing into the combustor 40 when the outlet temperature is higher than the reference value, and When the temperature is lower than the reference value, the distribution ratio to the common heater 70 is increased.

The embodiments described in this specification and the accompanying drawings merely illustrate some of the technical ideas included in the present invention by way of example. Therefore, since the embodiments disclosed herein are intended to explain rather than limit the technical spirit of the present invention, it is obvious that the scope of the technical spirit of the present invention is not limited by these embodiments. All modifications and specific embodiments that can be easily inferred by those skilled in the art within the scope of the technical idea included in the specification and drawings of the present invention should be construed as being included in the scope of the present invention.

10: molten carbonate fuel cell 20: valve system
30: solid oxide water electrolytic cell 40: combustor
50: compressor 60: reforming system
70: shared heater 80: third valve

Claims (19)

A molten carbonate type fuel cell that generates electricity by a chemical reaction between oxygen supplied to the cathode input terminal (CI1) and hydrogen supplied to the anode input terminal (AI1);
a combustor for heating external air to be supplied to the cathode input terminal (CI1) of the molten carbonate fuel cell;
a first valve for distributing the exhaust gas from the anode output terminal (AO1) of the molten carbonate fuel cell to the combustor and the solid oxide water electrolysis cell; and
A solid oxide water electrolysis cell for producing oxygen and hydrogen by electrolyzing moisture in the exhaust gas distributed from the first valve;
The combustor heats external air by using a chemical reaction between the unreacted fuel contained in the exhaust gas of the first valve and external air.
Convergence system of molten carbonate fuel cell and solid oxide water electrolysis cell. According to claim 1,
The first valve is a fusion system of a molten carbonate type fuel cell and a solid oxide water electrolytic cell, characterized in that for adjusting the distribution ratio to the combustor and the solid oxide water electrolytic cell according to operating conditions. According to claim 2,
In the operating condition, the exhaust gas of the anode output stage AO1 is adjusted so that the solid oxide water electrolytic cell operates at the maximum. A convergence system of a molten carbonate type fuel cell and a solid oxide water electrolytic cell, characterized in that the distribution to the solid oxide water electrolytic cell, and distribution of the remaining exhaust gas to the combustor. According to claim 1,
A molten carbonate fuel cell and a solid oxide, characterized in that it further comprises a first filter disposed between the anode output terminal (AO1) and the first valve, and removing the electrolyte contained in the exhaust gas of the anode output terminal (AO1) Convergence system of water electrolytic cell. delete According to claim 1,
A convergence system of a molten carbonate type fuel cell and a solid oxide water electrolytic cell, characterized in that the exhaust gas of the anode output stage (AO2) of the solid oxide water electrolytic cell is joined to the external air and supplied to the combustor. A molten carbonate type fuel cell that generates electricity by a chemical reaction between oxygen supplied to the cathode input terminal (CI1) and hydrogen supplied to the anode input terminal (AI1);
a combustor for heating external air to be supplied to the cathode input terminal (CI1) of the molten carbonate fuel cell;
a first valve for distributing the exhaust gas from the anode output terminal (AO1) of the molten carbonate fuel cell to the combustor and the solid oxide water electrolysis cell;
a solid oxide water electrolysis cell that produces oxygen and hydrogen by electrolyzing moisture contained in exhaust gas of an anode output terminal (AO1) of the molten carbonate fuel cell; and
A second valve for distributing exhaust gas from the cathode output terminal (CO1) of the molten carbonate fuel cell to the anode input terminal (AI2) of the solid oxide water electrolytic cell and a hot box of the solid oxide water electrolytic cell,
The combustor heats external air by using a chemical reaction between the unreacted fuel contained in the exhaust gas of the first valve and external air.
Convergence system of molten carbonate fuel cell and solid oxide water electrolysis cell. According to claim 7,
The second valve adjusts the distribution ratio between the anode input terminal (AI2) of the solid oxide water electrolysis battery and the hot box of the solid oxide water electrolysis battery according to operating conditions. Convergence system of water electrolytic cell. According to claim 7,
A convergence system of a molten carbonate type fuel cell and a solid oxide water electrolytic cell, characterized in that the waste heat of the hot box of the solid oxide water electrolytic cell is supplied to the heat exchanger and used for heating the external fuel. According to claim 7,
A molten carbonate fuel cell and a solid oxide, characterized in that it further comprises a second filter disposed between the cathode output stage (CO1) and the second valve, and removing the electrolyte contained in the exhaust gas of the cathode output stage (CO1) Convergence system of water electrolytic cell. A molten carbonate type fuel cell that generates electricity by a chemical reaction between oxygen supplied to the cathode input terminal (CI1) and hydrogen supplied to the anode input terminal (AI1);
a combustor for heating external air to be supplied to the cathode input terminal (CI1) of the molten carbonate fuel cell;
a first valve for distributing the exhaust gas from the anode output terminal (AO1) of the molten carbonate fuel cell to the combustor and the solid oxide water electrolysis cell;
a solid oxide water electrolytic cell producing oxygen and hydrogen by electrolyzing moisture in the exhaust gas distributed from the first valve; and
A second valve for distributing exhaust gas from the cathode output stage (CO1) of the molten carbonate fuel cell to the solid oxide water electrolysis cell and a heat exchanger for heating external fuel,
The combustor heats external air by using a chemical reaction between the unreacted fuel contained in the exhaust gas of the first valve and external air.
Convergence system of molten carbonate fuel cell and solid oxide water electrolysis cell. According to claim 11,
The second valve is a convergence system of a molten carbonate type fuel cell and a solid oxide water electrolytic cell, characterized in that for adjusting the distribution ratio between the anode input terminal (AI2) of the solid oxide water electrolytic cell and the heat exchanger according to operating conditions. . According to claim 11,
The second valve transfers exhaust gas from the cathode output stage (CO1) of the molten carbonate type fuel cell to the anode input stage (AI2) of the solid oxide water electrolysis cell, the hot box of the solid oxide water electrolysis cell, and the heat exchanger according to operating conditions. A convergence system of a molten carbonate fuel cell and a solid oxide water electrolytic cell, characterized in that the distribution is divided into groups. According to claim 11,
A molten carbonate fuel cell and a solid oxide, characterized in that it further comprises a second filter disposed between the cathode output stage (CO1) and the second valve, and removing the electrolyte contained in the exhaust gas of the cathode output stage (CO1) Convergence system of water electrolytic cell. A molten carbonate type fuel cell that generates electricity by a chemical reaction between oxygen supplied to the cathode input terminal (CI1) and hydrogen supplied to the anode input terminal (AI1);
a combustor for heating external air to be supplied to the cathode input terminal (CI1) of the molten carbonate fuel cell;
a common heater for heating external air using heat contained in the exhaust gas of the anode output terminal (AO1) of the molten carbonate fuel cell;
a first valve for distributing exhaust gas from an anode output terminal (AO1) of the molten carbonate fuel cell to the combustor and the common heater; and
A solid oxide water electrolytic cell for producing oxygen and hydrogen by electrolyzing moisture in the exhaust gas of the anode output terminal (AO1) via the common heater,
The combustor heats external air by using a chemical reaction between the unreacted fuel contained in the exhaust gas of the first valve and external air.
Convergence system of molten carbonate fuel cell and solid oxide water electrolysis cell. According to claim 15,
The first valve is a fusion system of a molten carbonate type fuel cell and a solid oxide water electrolytic cell, characterized in that for adjusting the distribution ratio to the combustor and the solid oxide water electrolytic cell according to operating conditions. According to claim 15,
A convergence system of a molten carbonate type fuel cell and a solid oxide water electrolytic cell, characterized in that it further comprises a third valve for distributing external air to the combustor and the common heater. According to claim 17,
Convergence of a molten carbonate type fuel cell and a solid oxide water electrolytic cell, characterized in that the exhaust gas of the anode output stage (AO2) of the solid oxide water electrolytic cell is joined to the external air distributed from the third valve and supplied to the combustor. system. According to claim 17,
A convergence system of a molten carbonate fuel cell and a solid oxide water electrolytic cell, characterized in that the external air heated by the common heater and the combustor is supplied to the cathode input terminal of the molten carbonate fuel cell.

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