KR20210010313A - 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 electrolysis cell which can increase hydrogen production efficiency. According to an embodiment of the present invention, the convergence system comprises: a molten carbonate type fuel cell producing electricity by a chemical reaction of oxygen supplied to a cathode input terminal (CI1) and hydrogen supplied to an anode input terminal (AI1); a first valve distributing anode exhaust gas of the molten carbonate type fuel cell to a combustor and a solid oxide water electrolytic cell; and a solid oxide electrolysis cell electrolyzing moisture of the exhaust gas distributed from the first valve to produce the oxygen and the hydrogen. The first valve controls a distribution ratio between the combustor and the solid oxide water electrolysis cell in accordance with operating conditions.

Description

Convergence system of molten carbonate type fuel cell and solid oxide electrolytic cell {CONVERGENCE SYSTEM COMPRISING MOLTEN CARBONATE FUEL CELL AND SOLID OXIDE ELECTROLYSIS CELL}

The present invention relates to a fusion system of a molten carbonate type fuel cell and a solid oxide electrolysis cell, and more particularly, a molten carbonate type fuel cell (MCFC) and a solid oxide electrolysis cell. , SOEC) is related to a fusion system of a molten carbonate type fuel cell and a solid oxide water electrolytic cell driven in an organic relationship.

In general, a fuel cell refers to a battery 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 combined heat and power generation to simultaneously produce power and heat. The fuel cell system uses natural gas as fuel and extracts hydrogen contained in natural gas from a reformer and supplies it to the stack of fuel cells. The stack of fuel cells produces electricity from hydrogen through an electrochemical reaction, and waste heat generated in the power generation process is recovered by a heat recovery device and 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 anode of the fuel cell and oxygen passes through the cathode. Hydrogen and oxygen react electrochemically to produce water and heat. At this time, as electrons pass through the electrolyte, direct current electricity flows through the electrode, and the direct current electricity is used as power of a direct current motor or converted into an alternating current electricity by a power converter. The heat generated from the fuel cell can generate steam or be used as heating and cooling heat, and when not used, it is discharged as exhaust heat.

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 referred to as a molten carbonate fuel cell (MCFC).

The molten carbonate type fuel cell is used for power generation because of its high efficiency and good long-term operation performance compared to the polymer electrolyte fuel cell (PEMFC) used for home/building/vehicle. In addition, the molten carbonate type fuel cell is capable of large-capacity output compared to the facility scale and has a longer lifespan than other fuel cells, so various studies for use as a driving source of a ship are being conducted.

The present invention is a fusion system of a molten carbonate type fuel cell and a solid oxide electrolytic cell that can be used by circulating fuel required for driving and by-products generated after driving by organically combining a molten carbonate type fuel cell and a solid oxide electrolytic cell Its purpose is to provide.

In addition, the present invention has another object to increase the efficiency of the system by optimizing the configuration required for the system operation.

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

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

The first valve adjusts the distribution ratio to the combustor and the solid oxide electrolytic cell according to an operating condition.

The operating conditions include the exhaust gas of the anode output terminal AO1 so that the solid oxide electrolytic cell is operated to the maximum. The solid oxide electrolytic cell is distributed, and the remaining exhaust gas is distributed to the combustor.

A first filter disposed between the anode output terminal AO1 and the first valve may further include a first filter for removing an electrolyte contained in the exhaust gas of the anode output terminal AO1.

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

The exhaust gas of the anode output terminal AO2 of the solid oxide electrolytic battery is supplied to the combustor after being joined to the external air.

The present invention is a molten carbonate type fuel cell that generates electricity by a chemical reaction of oxygen supplied to the cathode input terminal (CI1) and hydrogen supplied to the anode input terminal (AI1), and the anode output terminal (AO1) of the molten carbonate type fuel cell The solid oxide hydroelectrolyte cell that electrolyzes moisture contained in the exhaust gas to produce oxygen and hydrogen, and the cathode output terminal (CO1) of the molten carbonate type fuel cell, and the discharge gas to the anode input terminal (AI2) of the solid oxide water electrolysis battery Another embodiment proposes a fusion system of a molten carbonate type fuel cell and a solid oxide electrolytic cell including a second valve for distributing the solid oxide electrolytic cell to a hot box.

In another embodiment, the second valve adjusts the distribution ratio between the anode input terminal AI2 of the solid oxide electrolytic cell and the solid oxide electrolytic cell to a hot box according to an operating condition.

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

A second filter disposed between the cathode output terminal CO1 and the second valve and configured to remove electrolyte contained in the exhaust gas of the cathode output terminal CO1 may be further included.

The present invention relates to a molten carbonate type fuel cell that generates electricity by a chemical reaction of oxygen supplied to the cathode input terminal (CI1) and hydrogen supplied to the anode input terminal (AI1), and the anode output terminal (AO1) of the molten carbonate type fuel cell. ) The solid oxide electrolytic cell that produces oxygen and hydrogen by electrolyzing moisture contained in the exhaust gas, and the cathode output terminal (CO1) of the molten carbonate type fuel cell, heats the solid oxide electrolytic cell and external fuel. Another embodiment proposes a fusion system of a molten carbonate type fuel cell and a solid oxide electrolytic cell including a second valve distributed to a heat exchanger.

The second valve adjusts the distribution ratio between the anode input terminal AI2 of the solid oxide electrolytic cell and the heat exchanger according to an operating condition.

According to operating conditions, the second valve transfers the exhaust gas from the cathode output terminal (CO1) of the molten carbonate type fuel cell to the anode input terminal (AI2) of the solid oxide electrolytic cell, a hot box of the solid oxide electrolytic cell, and the heat exchange. Allocate by period.

It is disposed between the cathode output terminal (CO1) and the second valve, and further includes a second filter to remove the electrolyte contained in the discharge gas of the cathode output terminal (CO1).

The present invention is a molten carbonate type fuel cell that generates electricity by a chemical reaction of oxygen supplied to the cathode input terminal (CI1) and hydrogen supplied to the anode input terminal (AI1), and the anode output terminal (AO1) of the molten carbonate type fuel cell A combustor that heats the outside air using unreacted fuel contained in the exhaust gas, the anode output terminal (AO1) of the molten carbonate type fuel cell, a common heater that heats the outside air by using the heat contained in the exhaust gas, the molten carbonate A first valve that distributes the exhaust gas of the anode output terminal (AO1) of the fuel cell to the combustor and the common heater, and the anode output terminal (AO1) through the common heater electrolyzes moisture in the exhaust gas to produce oxygen and hydrogen Another embodiment proposes a fusion system of a molten carbonate type fuel cell including a solid oxide electrolytic cell and a solid oxide electrolytic cell.

The first valve adjusts the distribution ratio to the combustor and the solid oxide electrolytic cell according to an operating condition.

It may further include a third valve for distributing external air to the combustor and the common heater.

The exhaust gas of the anode output terminal AO2 of the solid oxide electrolytic cell is supplied to the combustor after being joined with the external air distributed from the third valve.

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

According to an embodiment of the present invention, the fuel required when the molten carbonate type fuel cell and the solid oxide electrolytic cell are driven and by-products generated after the drive are circulated and used, thereby minimizing the required fuel compared to the amount of hydrogen and power production.

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

According to an embodiment of the present invention, waste heat included in the exhaust gas of the molten carbonate type fuel cell is supplied to the hot box of the solid oxide electrolytic cell, thereby minimizing energy consumption for maintaining the operating conditions of the hot box.

According to an embodiment of the present invention, by appropriately distributing the exhaust gas of the molten carbonate type fuel cell to the combustor and the solid oxide electrolytic cell using a control valve according to the operating conditions, it is possible to easily achieve the operation purpose or operation efficiency desired by the driver. have.

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

According to an embodiment of the present invention, waste heat contained 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 electrolytic cell by using a control valve according to the operating conditions, Efficiency can be achieved easily.

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 electrolytic cell, the hot box of the solid oxide electrolytic cell, and the heat exchanger using a control valve according to the operating conditions, so that the desired operation purpose Alternatively, operation efficiency can be easily achieved.

According to an embodiment of the present invention, by appropriately distributing the exhaust gas of the molten carbonate type fuel cell to a common heater for heating the combustor and outside air using a control valve according to the operating conditions, the operation purpose or operation efficiency desired by the driver can be easily achieved. Can be achieved.

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

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

Since the description of the present invention is merely 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 embodiments can be variously changed and have various forms, the scope of the present invention should be understood to include 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 those effects, the scope of the present invention should not be understood as being limited thereto.

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

Terms such as "first" and "second" are used to distinguish one component from other components, and the scope of rights is not limited by these terms. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component.

When a component is referred to as being "connected" to another component, it should be understood that although it may be directly connected to the other component, another component may exist in the middle. On the other hand, when it is mentioned that a certain component is "directly connected" to another component, it should be understood that no other component exists in the middle. On the other hand, other expressions describing the relationship between the constituent elements, that is, "between" and "just between" or "neighboring to" and "directly neighboring to" should be interpreted as well.

Singular expressions are to be understood as including plural expressions unless the context clearly indicates otherwise, and terms such as “comprise” or “have” refer to implemented features, numbers, steps, actions, components, parts, or It is to be understood that it is intended to designate that a combination exists and does not preclude the presence or addition of one or more other features or numbers, steps, actions, components, parts, or combinations thereof.

In each step, the identification code (for example, 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 has a specific sequence clearly in context. Unless otherwise stated, it may occur differently from the stated order. That is, each of the steps 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 field to which the present invention belongs, unless otherwise defined. Terms defined in commonly used dictionaries should be construed as having meanings in the context of related technologies, and cannot be construed as having an ideal or excessive formal meaning unless explicitly defined in the present application.

<First Example>

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

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

The molten carbonate type 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 as shown in [Table 1] (hereinafter referred to as'anode exhaust gas') (anode off gas) is discharged to the anode output (AO1) of the molten carbonate type fuel cell.

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

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

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

The valve system 20 includes a first valve 22 for distributing the anode exhaust gas of the molten carbonate type fuel cell to the combustor 40 and the solid oxide electrolytic 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 electrolytic cell 30 by the first valve 22.

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

As an example of the operating conditions, the amount of hydrogen to be produced in the solid oxide electrolytic cell 30 may be mentioned. That is, if the operation condition of the solid oxide electrolytic cell 30 as a top priority, the first valve 22 is configured to control the exhaust gas of the anode output terminal AO1 so that the solid oxide electrolytic cell 30 is operated to the maximum. The solid oxide electrolytic cell 30 is distributed, and the remaining exhaust gas is distributed to the combustor 40.

As another example of the operating conditions, the operating conditions for stopping the operation of the solid oxide electrolytic cell 30 may be set. This is because there may be a case in which a temporary problem occurs in the solid oxide electrolytic cell 30 or a functional deterioration occurs in a consumable configuration, and the operation must be stopped for maintenance. In this case, the first valve 22 makes the distribution to the solid oxide electrolytic cell 30 to be zero and all the exhaust gas of the anode output terminal AO1 It is 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 type 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 terminal AO1 may continuously accumulate in the first valve 22 and the solid oxide electrolytic cell at the rear stage, resulting in a decrease in function. As the first filter 21, an electrostatic filter made of ceramic or metal may be used. In addition, one of HEPA, ULPA, chlorinated, Medium, and Pocket filters may be used.

The solid oxide electrolytic cell 30 electrolyzes moisture (H 2 O) of the exhaust gas distributed from the first valve 22 to produce oxygen and hydrogen.

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

The gas containing oxygen (O2) is discharged to the anode output terminal (AO2) and the gas containing hydrogen (H2) is discharged to the cathode output terminal (CO2) by the electrolysis of the solid oxide electrolytic cell 30 do.

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

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

The compressor 50 compresses the exhaust gas of the cathode output terminal (CO2) of the solid oxide electrolytic cell 30. Compressed exhaust gas (Compressed Gas, CG) contains a large amount of hydrogen and may be used as fuel for the molten carbonate type fuel cell 10 later or stored in a hydrogen tank (not shown in the drawing) provided at the rear end.

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

As an optional embodiment (OE1), some of the cathode exhaust gas of the molten carbonate type fuel cell 10 may be branched and supplied to the superheater 61 of the reforming system 60. The superheater 61 increases the temperature of the gas supplied from the reformer to the anode input terminal AI1 by using heat contained in the cathode exhaust gas of the molten carbonate type fuel cell 10.

As an optional embodiment 2 (OE2), a part of the heat generated by the superheater 61 is distributed to the heat exchanger 62 and the external fuel (NG+H2O mixed gas) introduced into the heat exchanger 62 You can increase the temperature.

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

<Second Example>

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

The fusion system of the second embodiment includes a molten carbonate type fuel cell 10, a valve system 20-1, a solid oxide electrolytic cell 30, a combustor 40, 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 20-1 is a second valve 24- for distributing the cathode exhaust gas of the molten carbonate type fuel cell 10 to the solid oxide water electrolytic cell 30 and the hot box 31 of the solid oxide water electrolytic cell. Includes 1). Some of the cathode exhaust gas of the molten carbonate type fuel cell is distributed to the anode input terminal AI2 of the solid oxide electrolytic 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 electrolytic cell 30, and the molten carbonate type is supplied to the hot box 31 of the solid oxide electrolytic cell. Heat is mainly transferred from the cathode exhaust gas of the fuel cell.

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

As an example of the operating conditions, the amount of hydrogen to be produced in the solid oxide electrolytic cell 30 may be mentioned. That is, if the operation condition that prioritizes the operation of the solid oxide electrolytic cell 30, the second valve 24-1 controls the exhaust gas of the cathode output terminal (CO1) so that the solid oxide electrolytic cell 30 is maximally operated. It distributes to the anode input terminal AI2 of the solid oxide electrolytic cell 30, and distributes the remaining exhaust gas to the hot box 31 of the solid oxide electrolytic cell 30.

The valve system 20 may further include a second filter 23 disposed between the cathode output terminal CO1 of the molten carbonate type fuel cell and the second valve 24-1. The second filter 23 removes the electrolyte contained in the exhaust gas of the cathode output terminal CO1. This is because the viscous electrolyte contained in the exhaust gas of the cathode output stage CO1 continuously accumulates in the second valve 24-1 and the solid oxide electrolytic 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, chlorinated, Medium, and Pocket filters may be used.

The solid oxide electrolytic cell 30 produces oxygen and hydrogen by electrolyzing moisture (H2O) 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 electrolytic cell 30 or may be supplied through the first valve 31.

In addition, other detailed descriptions of the solid oxide electrolytic cell 30 and detailed descriptions of the combustor 40, the compressor 50, and the reforming system 60 are the same as those of the first embodiment.

In addition, optional embodiments of OE1 to OE3 may be applied in the same manner as in Example 1.

<Third Example>

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

The fusion system of the third embodiment includes a molten carbonate type fuel cell 10, a valve system 20-2, a solid oxide electrolytic cell 30, a combustor 40, 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 20-2 distributes the exhaust gas of the cathode output terminal (CO1) of the molten carbonate type fuel cell 10 to the solid oxide electrolytic cell 30 and the heat exchanger 62 of the reforming system 60. It includes a valve 24-2. Some of the cathode exhaust gas of the molten carbonate type fuel cell is distributed to the anode input terminal AI2 of the solid oxide electrolytic 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 electrolytic cell 30, and the molten carbonate type is supplied to the 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 electrolytic cell 30 and the reforming system 60 to the heat exchanger 62 according to the operating conditions.

As an example of the operating conditions, the amount of hydrogen to be produced in the solid oxide electrolytic cell 30 may be mentioned. That is, if the operation condition that prioritizes the operation of the solid oxide electrolytic cell 30, the second valve 24-2 controls the exhaust gas of the cathode output terminal (CO1) so that the solid oxide electrolytic cell 30 operates to the maximum. It distributes to the anode input terminal AI2 of the solid oxide electrolytic cell 30, and distributes the remaining exhaust gas to the heat exchanger 62 of the reforming system 60.

As another example of the operating conditions, the operating conditions for stopping the operation of the solid oxide electrolytic cell 30 may be set. That is, the first valve 24-2 makes the distribution to the anode input terminal AI2 of the solid oxide electrolytic cell 30 to be zero, and exhausts all the exhaust gas of the anode output terminal AO1. It is distributed to the heat exchanger 62.

The valve system 20-2 may further include a second filter 23 disposed between the cathode output terminal CO1 of the molten carbonate type 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 electrolytic cell 30 produces oxygen and hydrogen by electrolyzing moisture (H2O) 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 electrolytic cell 30 or may be supplied through the first valve 31. Other detailed descriptions of the solid oxide electrolytic cell 30 are the same as those of the first or second embodiment.

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

In addition, optional embodiments of OE1 to OE3 may be applied in the same manner as in Example 1.

<Fourth Example>

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

The fusion system of the fourth embodiment includes a molten carbonate type fuel cell 10, a valve system 20-3, a solid oxide electrolytic cell 30, a combustor 40, 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 20-3 converts the exhaust gas from the cathode output terminal (CO1) of the molten carbonate type fuel cell 10 into a solid oxide water electrolysis cell 30, a hot box 31 of the solid oxide water electrolysis cell 30, and It includes a second valve 24-3 that distributes to the heat exchanger 62 of the reforming system 60.

The second valve 24-3 is applied to the solid oxide electrolytic cell 30, the hot box 31 of the solid oxide electrolytic cell 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 electrolytic cell 30 may be mentioned. That is, if the operation condition that prioritizes the operation of the solid oxide electrolytic cell 30, the second valve 24-2 controls the exhaust gas of the cathode output terminal (CO1) so that the solid oxide electrolytic cell 30 operates to the maximum. Distributed to the anode input terminal (AI2) of the solid oxide electrolytic cell 30, and the remaining exhaust gas distributed to the hot box 31 of the solid oxide electrolytic cell 30 and the heat exchanger 62 of the reforming system 60 do. Here, the distribution ratio of the residual 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 conditions, the operating conditions for stopping the operation of the solid oxide electrolytic cell 30 may be set. That is, the first valve 24-2 makes the distribution of the solid oxide electrolytic cell 30 to the anode input terminal AI2 and the hot box 31 to zero, and reduces all the exhaust gas of the anode output terminal AO1. It is distributed to the heat exchanger 62.

The description of the technical components other than the second valve 24-3 is the same as in the second or third embodiment.

<Fifth Example>

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

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

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 type 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 electrolytic 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 the operating conditions. The embodiment of the operating conditions can 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 battery 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 type fuel cell and the first valve 22.

The solid oxide electrolytic cell 30 produces oxygen and hydrogen by electrolyzing moisture (H2O) from the anode exhaust gas of the molten carbonate type 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 electrolytic cell 30, and the anode input terminal (AI2) of the solid oxide electrolytic cell 30 is the cathode of the molten carbonate type fuel cell. The exhaust gas is supplied.

More specifically, moisture (H2O) is mainly supplied to the cathode input terminal (CI2) of the solid oxide electrolytic cell 30 from the anode exhaust gas of the molten carbonate type fuel cell, and the anode input terminal of the solid oxide electrolytic cell 30 Oxygen (O2) from 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 type fuel cell is the second filter 23 and/or the second valve 24, 24-1, 24-2, 24-3. It may be supplied to the anode input terminal AI2 of the solid oxide electrolytic cell 30 via one).

The gas containing oxygen (O2) is discharged to the anode output terminal (AO2) and the gas containing hydrogen (H2) is discharged to the cathode output terminal (CO2) by the electrolysis of the solid oxide electrolytic cell 30 do.

The combustor 40 heats outer air (OA) using unreacted fuel included in the anode exhaust gas of the molten carbonate type fuel cell distributed by the first valve 22. Hydrogen (H2) may be included in the unreacted fuel. External air (OA) may be input to the combustor 40 after the primary temperature is raised by the common heater 70. In addition, the exhaust gas of the anode output terminal AO2 of the solid oxide electrolytic cell 30 may be joined to external air and supplied to the combustor 40. The combustor 40 increases combustion efficiency by using oxygen (O2) contained in the exhaust gas of the anode output terminal (AO2).

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

The compressor 50 and the reforming system 60 are the same as those of the first to fourth embodiments.

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 provided from the first valve 22-4. The heated molten carbonate type fuel cell anode exhaust gas is transferred to the cathode input terminal (CI2) of the solid oxide electrolytic cell. Second, the common heater 70 primarily preheats the outside air. The preheated external air is moved to the combustor 40.

The common heater 70 may be one 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 type fuel cell provided 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 may have a structure partitioned from each other by a partition wall to increase thermal efficiency.

<Sixth Example>

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

The fusion system of the sixth embodiment includes a molten carbonate type fuel cell 10, a valve system 20-4, a solid oxide electrolytic 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 type fuel cell (10), valve system (20-4), solid oxide electrolytic cell (30), combustor (40), common heater (70), third valve (80), compressor (50) and reforming 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 external air inlet and the common heater 70. The external air is distributed to the combustor 40 and the common heater 70 by the third valve 80. A part of the external air is branched by the third valve 80, merges with the exhaust gas of the anode output terminal AO2 of the solid oxide electrolytic cell, and then is input to the combustor 40. In addition, another part of the external air is preheated by the common heater 70 and then input to the combustor 40.

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

An example of the driving condition is a condition in which the outlet temperature of the combustor 40 is kept constant at a preset value. 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 the outlet When the temperature is lower than the reference value, the distribution ratio to the common heater 70 is increased.

The embodiments described in the present specification and the accompanying drawings are merely illustrative of some of the technical ideas included in the present invention. Accordingly, it is obvious that the embodiments disclosed in the present specification are not intended to limit the technical idea of the present disclosure, but to explain the technical idea, and thus the scope of the technical idea of the present disclosure is not limited by these embodiments. Modification examples 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 interpreted as being included in the scope of the present invention.

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

Claims (19)

A molten carbonate type fuel cell that generates electricity by a chemical reaction of oxygen supplied to the cathode input terminal CI1 and hydrogen supplied to the anode input terminal AI1;
A first valve for distributing the exhaust gas of the anode output terminal (AO1) of the molten carbonate type fuel cell to a combustor and a solid oxide electrolytic cell; And
A solid oxide electrolytic battery producing oxygen and hydrogen by electrolyzing the moisture of the exhaust gas distributed from the first valve
Convergence system of a molten carbonate type fuel cell and a solid oxide electrolytic cell comprising a. The method of claim 1,
The first valve is a fusion system of a molten carbonate type fuel cell and a solid oxide electrolytic cell, characterized in that controlling the distribution ratio to the combustor and the solid oxide electrolytic cell according to operating conditions. The method of claim 2,
The operating conditions include the exhaust gas of the anode output terminal AO1 so that the solid oxide electrolytic cell is operated to the maximum. A fusion system of a molten carbonate type fuel cell and a solid oxide electrolytic cell, characterized in that distribution to the solid oxide electrolytic cell and residual exhaust gas to the combustor. The method of claim 1,
A molten carbonate type fuel cell and solid oxide, further comprising a first filter disposed between the anode output terminal AO1 and the first valve, and for removing the electrolyte contained in the exhaust gas of the anode output terminal AO1. Convergence system of water electrolysis battery. The method of claim 1,
The combustor heats external air using unreacted fuel included in the exhaust gas of the first valve,
The heated external air is supplied to the cathode input terminal of the molten carbonate type fuel cell. A fusion system of a molten carbonate type fuel cell and a solid oxide electrolytic cell. The method of claim 5,
A fusion system of a molten carbonate type fuel cell and a solid oxide electrolytic cell, characterized in that the exhaust gas of the anode output terminal (AO2) of the solid oxide electrolytic cell is supplied to the combustor after being joined to the external air. A molten carbonate type fuel cell that generates electricity by a chemical reaction of oxygen supplied to the cathode input terminal CI1 and hydrogen supplied to the anode input terminal AI1;
A solid oxide electrolytic cell for producing oxygen and hydrogen by electrolyzing moisture contained in the exhaust gas of the anode output terminal (AO1) of the molten carbonate type fuel cell; And
A second valve for distributing the exhaust gas from the cathode output terminal (CO1) of the molten carbonate type fuel cell to the anode input terminal (AI2) of the solid oxide electrolytic cell and the hot box of the solid oxide electrolytic cell
Convergence system of a molten carbonate type fuel cell and a solid oxide electrolytic cell comprising a. The method of claim 7,
The second valve is a molten carbonate type fuel cell and solid oxide, characterized in that it controls the distribution ratio of the anode input terminal (AI2) of the solid oxide electrolytic cell to the hot box and the solid oxide electrolytic cell according to operating conditions. Convergence system of water electrolysis battery. The method of claim 7,
The waste heat of the hot box of the solid oxide electrolytic cell is supplied to a heat exchanger and used for heating external fuel. The method of claim 7,
A molten carbonate type fuel cell and solid oxide, further comprising a second filter disposed between the cathode output terminal CO1 and the second valve, and for removing the electrolyte contained in the exhaust gas of the cathode output terminal CO1. Convergence system of water electrolysis battery. A molten carbonate type fuel cell that generates electricity by a chemical reaction of oxygen supplied to the cathode input terminal CI1 and hydrogen supplied to the anode input terminal AI1;
A solid oxide electrolytic cell for producing oxygen and hydrogen by electrolyzing moisture contained in the exhaust gas of the anode output terminal (AO1) of the molten carbonate type fuel cell; And
A second valve for distributing the exhaust gas of the cathode output terminal (CO1) of the molten carbonate type fuel cell to the solid oxide electrolytic cell and a heat exchanger for heating external fuel
Convergence system of a molten carbonate type fuel cell and a solid oxide electrolytic cell comprising a. The method of claim 11,
The second valve is a fusion system of a molten carbonate type fuel cell and a solid oxide electrolytic cell, characterized in that the distribution ratio between the anode input terminal (AI2) of the solid oxide electrolytic cell and the heat exchanger is adjusted according to operating conditions. . The method of claim 11,
According to operating conditions, the second valve transfers the exhaust gas from the cathode output terminal (CO1) of the molten carbonate type fuel cell to the anode input terminal (AI2) of the solid oxide electrolytic cell, a hot box of the solid oxide electrolytic cell, and the heat exchange. Convergence system of a molten carbonate type fuel cell and a solid oxide electrolytic cell, characterized in that distribution by group. The method of claim 11,
A molten carbonate type fuel cell and solid oxide, further comprising a second filter disposed between the cathode output terminal CO1 and the second valve, and for removing the electrolyte contained in the exhaust gas of the cathode output terminal CO1. Convergence system of water electrolysis battery. A molten carbonate type fuel cell that generates electricity by a chemical reaction of oxygen supplied to the cathode input terminal CI1 and hydrogen supplied to the anode input terminal AI1;
A combustor for heating external air using unreacted fuel contained in exhaust gas of the anode output terminal (AO1) of the molten carbonate type fuel cell;
A common heater for heating external air using heat included in the exhaust gas of the anode output terminal (AO1) of the molten carbonate type fuel cell;
A first valve for distributing exhaust gas from the anode output terminal (AO1) of the molten carbonate type fuel cell to the combustor and the common heater; And
A solid oxide electrolytic battery producing oxygen and hydrogen by electrolyzing moisture in the exhaust gas of the anode output terminal (AO1) via the common heater
Convergence system of a molten carbonate type fuel cell and a solid oxide electrolytic cell comprising a. The method of claim 15,
The first valve is a fusion system of a molten carbonate type fuel cell and a solid oxide electrolytic cell, characterized in that controlling the distribution ratio to the combustor and the solid oxide electrolytic cell according to operating conditions. The method of claim 15,
A fusion system of a molten carbonate type fuel cell and a solid oxide electrolytic cell, further comprising a third valve for distributing external air to the combustor and the common heater. The method of claim 17,
Convergence of a molten carbonate type fuel cell and a solid oxide electrolytic cell, characterized in that the exhaust gas from the anode output terminal (AO2) of the solid oxide electrolytic cell is supplied to the combustor by being joined to the external air distributed from the third valve system. The method of claim 17,
A fusion system of a molten carbonate type fuel cell and a solid oxide electrolytic cell, characterized in that external air heated by the common heater and the combustor is supplied to a cathode input terminal of the molten carbonate type fuel cell.

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