JPWO2020203087A1 - Hydrocarbon combustion system - Google Patents

Abstract

The hydrocarbon combustion system (100) uses an electrolytic device (106) that generates hydrogen using electric power generated from renewable energy, hydrogen generated by the electrolytic device (106), and hydrocarbons using carbon dioxide. (108), a hydrocarbon storage unit (112) for storing the hydrocarbons generated by the hydrocarbon generation equipment (108), and a hydrocarbon taken out from the hydrocarbon storage unit (112). A closed-type combustor (114) that burns hydrocarbons, separates carbon dioxide and water generated by the combustion of hydrocarbons, sends carbon dioxide to the hydrocarbon generator (108), and transfers water to the electrolytic device (106). It is provided with a gas-liquid separation unit (116) to be sent out.

Description

The present disclosure relates to a hydrocarbon combustion system. This application claims the benefit of priority under Japanese Patent Application No. 2019-06988 filed on April 1, 2019, the contents of which are incorporated herein by reference.

Patent Document 1 discloses that electric power is generated by using renewable energy and heat is generated by an electric heater using the generated electric power. However, power generation using renewable energy has a problem that the amount of power generation fluctuates depending on the time of day, and the timing of heat supply and demand does not always match.

On the other hand, Patent Document 2 describes that electric power is generated by using renewable energy, hydrogen is generated by an electrifier using the generated electric power, and methane is generated by a metanation reactor using the generated hydrogen. There is disclosure. If the generated methane can be stored and the stored methane can be burned as needed, the heat demand can be satisfied regardless of the time of day.

Japanese Unexamined Patent Publication No. 2014-31787 Japanese Unexamined Patent Publication No. 2017-197399

However, in Patent Document 2, water is required to generate hydrogen by the electrizer. That is, in Patent Document 2, it is necessary to supply water to the electrizer at any time when hydrogen is generated using renewable energy. It is necessary to remove impurities from this water in advance in order to prevent deterioration of the performance of the electrizer due to precipitation of impurities. When carbon dioxide is supplied from outside the system, a chemical absorption method such as amine absorption, a physical absorption method, a membrane separation method, etc. can be applied to recover carbon dioxide from combustion exhaust gas. It takes a lot of energy to separate. Therefore, Patent Document 2 has a problem that the cost increases as compared with the case where heat is generated by the electric heater of Patent Document 1.

It is an object of the present disclosure to provide a hydrocarbon combustion system capable of reducing the cost of generating heat.

In order to solve the above problems, the hydrocarbon combustion system as one aspect of the present disclosure includes an electrolytic device that generates hydrogen using electric power generated from renewable energy, hydrogen generated by the electrolytic device, and dioxide. A hydrocarbon generator that uses carbon to generate hydrocarbons, a hydrocarbon reservoir that stores the hydrocarbons generated by the hydrocarbon generator, and a closed combustion that burns the hydrocarbons taken out of the hydrocarbon reservoir. It is provided with a container and a separation unit that separates carbon dioxide and water generated by burning hydrocarbons and sends carbon dioxide to a hydrocarbon generator and water to an electrolytic device.

A carbon oxide storage unit for storing carbon dioxide delivered from the separation unit may be further provided.

It may further include a hydrocarbon generator, a hydrocarbon reservoir, a closed combustor, and a carbon oxide supply control unit that controls the amount of carbon dioxide circulating in the separation unit.

A water storage unit for storing water sent from the separation unit may be further provided.

It may further include an electrolyzer, a closed combustor, and a water supply control unit that controls the amount of water circulating in the separation unit.

In order to solve the above problems, the hydrocarbon combustion system as another aspect of the present disclosure is generated by an electrolytic device that generates hydrogen and carbon monoxide using electric power generated from renewable energy, and an electrolytic device. A hydrocarbon generator that generates hydrocarbons using the generated hydrogen and carbon monoxide, a hydrocarbon reservoir that stores the hydrocarbons generated by the hydrocarbon generator, and a hydrocarbon taken out from the hydrocarbon reservoir. It is provided with a closed-type combustor, which burns the hydrocarbon and sends carbon dioxide and water to the electrolytic device.

A combustion gas storage unit for storing carbon dioxide and water delivered from the closed combustor may be further provided.

It may further include an electrolyzer, a hydrocarbon generator, a hydrocarbon reservoir, and a combustion gas supply control unit that controls the amount of carbon dioxide and water circulating in the closed combustor.

A heat supply unit may be further provided to supply the heat generated by the hydrocarbon generator to the hydrocarbon storage unit.

A heat supply unit may be further provided to supply the heat generated by the closed combustor to the hydrocarbon storage unit.

A circulation pipe for returning a part of the combustion gas discharged from the downstream side of the closed combustor to the upstream side of the closed combustor may be further provided.

According to the present disclosure, the hydrocarbon combustion system can reduce the cost of generating heat.

FIG. 1 is a diagram illustrating a schematic configuration of a hydrocarbon combustion system according to the first embodiment. FIG. 2 is a block diagram showing a schematic configuration of the control device of the first embodiment. FIG. 3 is a diagram illustrating a schematic configuration of a hydrocarbon combustion system according to the second embodiment. FIG. 4 is a schematic configuration diagram of a hydrocarbon storage unit. FIG. 5 is a diagram illustrating a schematic configuration of a hydrocarbon combustion system according to a third embodiment. FIG. 6 is a diagram illustrating a schematic configuration of a hydrocarbon combustion system according to a fourth embodiment. FIG. 7 is a diagram illustrating a schematic configuration of a hydrocarbon combustion system according to a fifth embodiment. FIG. 8 is a diagram illustrating a schematic configuration of a hydrocarbon combustion system according to a sixth embodiment. FIG. 9 is a diagram illustrating a schematic configuration of a hydrocarbon combustion system according to a seventh embodiment. FIG. 10 is a block diagram showing a schematic configuration of the control device according to the seventh embodiment. FIG. 11 is a diagram illustrating a schematic configuration of a hydrocarbon combustion system according to an eighth embodiment. FIG. 12 is a block diagram showing a schematic configuration of the control device according to the eighth embodiment.

The embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding, and the present disclosure is not limited unless otherwise specified. In the present specification and the drawings, elements having substantially the same function and configuration are designated by the same reference numerals, so that duplicate description will be omitted. In addition, elements not directly related to the present disclosure are not shown.

[First Embodiment]
FIG. 1 is a diagram illustrating a schematic configuration of a hydrocarbon combustion system 100 according to the first embodiment. In FIG. 1, solid arrows indicate the flow of gas or liquid. In FIG. 1, the dashed arrow indicates the signal flow. As shown in FIG. 1, the hydrocarbon combustion system 100 includes a carbon oxide storage unit 102, a water storage unit 104, an electrolyzer 106, a hydrocarbon generation device 108, a gas-liquid separation unit 110, and a hydrocarbon storage unit. It includes 112, a closed-type combustor 114, and a gas-liquid separation unit (separation unit) 116.

The carbon oxide storage unit 102 stores carbon oxide. A predetermined amount of carbon oxide is stored in the carbon oxide storage unit 102 in advance before the hydrocarbon combustion system 100 is operated for the first time. However, a predetermined amount of carbon oxide may be supplied to the carbon oxide storage unit 102 from the outside when the hydrocarbon combustion system 100 is operated for the first time. In the first embodiment, the carbon oxide storage unit 102 stores carbon dioxide (CO ₂ ) as carbon oxide. However, the present invention is not limited to this, and the carbon oxide storage unit 102 may store carbon monoxide (CO) as carbon oxide. A first pipe 118 is arranged between the carbon oxide storage unit 102 and the hydrocarbon generator 108. The first pipe 118 communicates the carbon oxide storage unit 102 with the hydrocarbon generator 108. _{The carbon oxide storage unit 102 supplies carbon oxide (CO 2 in} FIG. 1) to the hydrocarbon generator 108 via the first pipe 118.

Water reservoir 104, water (in the first embodiment, liquid water or water _{vapor: H} 2 O) for storing. A predetermined amount of water is stored in the water storage unit 104 in advance before the hydrocarbon combustion system 100 is operated for the first time. However, a predetermined amount of water may be supplied to the water storage unit 104 from the outside when the hydrocarbon combustion system 100 is operated for the first time. A second pipe 120 is arranged between the water storage unit 104 and the electrolyzer 106. The second pipe 120 communicates the water storage unit 104 with the electrolytic device 106. _{The water storage unit 104 supplies water (2H 2} O (4H ₂ O) in FIG. 1) to the electrolyzer 106 via the second pipe 120.

As will be described later, in the first embodiment, the hydrocarbon combustion system 100 changes the amount of water supplied from the water storage unit 104 to the electrolyzer 106 according to the elapsed time after the start of operation. Specifically, the hydrocarbon combustion system 100, at the start operation to supply water 4H 2 _O indicated in parentheses in FIG. 1 from the water reservoir 104 to the electrolyzer 106. Further, the hydrocarbon combustion system 100, after operation of the closed-type combustor 114 after the start of operation, to supply the water 2H 2 _O shown in FIG. 1 from the water reservoir 104 to the electrolyzer 106.

The electrolytic device 106 is connected to a power generation device (not shown) that generates electric power from renewable energy. Electric power is supplied to the electrolytic device 106 from a power generation device (not shown). _{Further, water (4H 2} O in FIG. 1) is supplied to the electrolyzer 106 from the water storage unit 104 at the start of operation (initial time) of the hydrocarbon combustion system 100. The electrolyzer 106 produces hydrogen (4H _{2 in} FIG. 1) and oxygen (2O _{2 in} FIG. 1) from the supplied electric power and water.

A third pipe 122 is arranged between the electrolyzer 106 and the hydrocarbon generator 108. The third pipe 122 communicates the electrolyzer 106 and the hydrocarbon generator 108. _{The electrolyzer 106 supplies hydrogen (4H 2 in} FIG. 1) to the hydrocarbon generator 108 via the third pipe 122.

A fourth pipe 124 is arranged between the electrolyzer 106 and the closed combustor 114. The fourth pipe 124 communicates the electrolytic device 106 with the closed combustor 114. _{The electrolyzer 106 supplies oxygen (2O 2 in} FIG. 1) to the closed combustor 114 via the fourth pipe 124.

The hydrocarbon generator 108 uses the supplied hydrogen (4H _{2 in} FIG. 1) and carbon oxide (CO _{2 in} FIG. 1) to generate hydrocarbons (CH _{4 in} FIG. 1) and water (2H in FIG. 1). ₂ O) is generated. The hydrocarbon generator 108 is, for example, a metanation reactor (Sabatier reactor). In the first embodiment, the hydrocarbon generator 108 produces methane (CH _{4 in} FIG. 1) and steam (2H ₂ O in FIG. 1). However, the present invention is not limited to this, and the hydrocarbon generator 108 may generate a hydrocarbon (flammable gas) different from methane, such as ethane, propane, and butane.

A fifth pipe 126 is arranged between the hydrocarbon generator 108 and the gas-liquid separation unit 110. The fifth pipe 126 communicates the hydrocarbon generator 108 with the gas-liquid separation unit 110. _{The hydrocarbon generator 108 supplies hydrogen (methane: CH 4 in} FIG. 1) and water (steam: 2H ₂ O in FIG. 1) to the gas-liquid separation unit 110 via the fifth pipe 126.

In the first embodiment, a cooling device (not shown) is arranged in the fifth pipe 126. The cooling device cools the hydrocarbon (methane: CH _{4 in} FIG. 1) and water (steam: 2H ₂ O in FIG. 1) flowing through the fifth pipe 126. The cooling device cools the hydrocarbon (methane) to a temperature at which water (water vapor) is liquefied without liquefying it. The water vapor becomes liquid water when it is cooled by the cooling device.

The gas-liquid separation unit 110 separates the supplied hydrocarbon (methane) and water into gas-liquid. A sixth pipe 128 is arranged between the gas-liquid separation unit 110 and the hydrocarbon storage unit 112. The sixth pipe 128 communicates the gas-liquid separation unit 110 and the hydrocarbon storage unit 112. _{The gas-liquid separation unit 110 supplies the separated hydrocarbon (CH 4 in} FIG. 1) to the hydrocarbon storage unit 112 via the sixth pipe 128.

A seventh pipe 130 is arranged between the gas-liquid separation unit 110 and the electrolytic device 106. The seventh pipe 130 communicates the gas-liquid separation unit 110 with the electrolytic device 106. The gas-liquid separation unit 110 supplies (returns) the _{separated water (2H 2} O in FIG. 1) to the electrolyzer 106 via the seventh pipe 130.

The hydrocarbon storage unit 112 stores the supplied hydrocarbon (CH _{4 in} FIG. 1). An eighth pipe 132 is arranged between the hydrocarbon storage unit 112 and the closed combustor 114. The eighth pipe 132 communicates the hydrocarbon storage unit 112 with the closed combustor 114. The hydrocarbon storage unit 112 supplies the _{hydrocarbon (CH 4 in} FIG. 1) to the closed combustor 114 via the eighth pipe 132.

By the way, the amount of power generated by renewable energy fluctuates depending on the time of day. Therefore, when heat is generated by an electric heater, there is a problem that the timings of heat demand and supply do not always match. Therefore, the hydrocarbon combustion system 100 includes a hydrocarbon storage unit 112 that stores hydrocarbons generated based on renewable energy.

The hydrocarbon storage unit 112 can store and release (release) hydrocarbons generated based on renewable energy. Therefore, the hydrocarbon storage unit 112 can store the generated hydrocarbon when the heat demand is small, and can release the stored hydrocarbon when the heat demand is large.

As a result, the hydrocarbon combustion system 100 can supply the hydrocarbons stored in the hydrocarbon storage unit 112 to the closed combustor 114 at an arbitrary timing and an arbitrary amount and burn them. Therefore, the hydrocarbon combustion system 100 can satisfy the heat demand regardless of the time zone. That is, the hydrocarbon combustion system 100 stores the hydrocarbon generated based on the renewable energy, and supplies the stored hydrocarbon to the closed combustor 114 as needed, thereby timing the heat demand and supply. Can be matched.

The closed combustor 114 mixes and burns _{the hydrocarbon (CH 4 in} FIG. 1) and oxygen (2O _{2 in} FIG. 1) taken out from the hydrocarbon storage unit 112. The closed combustor 114 is, for example, a radiant tube burner. The closed combustor 114 generates heat by burning a fuel gas (a mixture of hydrocarbons and oxygen). The heat generated by the closed combustor 114 is used, for example, for heat treatment. Specifically, the heat generated by the closed combustor 114 is used to heat the work in the heating furnace.

When the fuel gas (mixture of hydrocarbon and oxygen) is burned, the closed combustor 114 contains carbon oxide (carbon dioxide: CO _{2 in} FIG. 1) and water (water vapor: 2H ₂ O in FIG. 1). ) Is generated. A ninth pipe 134 is arranged between the closed combustor 114 and the gas-liquid separation unit 116. The ninth pipe 134 communicates the closed combustor 114 with the gas-liquid separation unit 116. _{The closed combustor 114 supplies carbon oxide (CO 2 in} FIG. 1) and water (2H ₂ O in FIG. 1) to the gas-liquid separation unit 116 via the ninth pipe 134.

In the first embodiment, a cooling device (not shown) is arranged in the ninth pipe 134. The cooling device cools carbon oxide (carbon dioxide: CO _{2 in} FIG. 1) and water (steam: 2H ₂ O in FIG. 1) flowing through the ninth pipe 134. The cooling device cools water (water vapor) to a temperature at which it is liquefied without liquefying carbon oxide (carbon dioxide). The water vapor becomes liquid water when it is cooled by the cooling device.

The gas-liquid separation unit 116 separates the supplied carbon oxide (carbon dioxide) and water into gas-liquid. That is, the gas-liquid separation unit 116 separates carbon oxide (carbon dioxide) and water generated by combustion of fuel gas (mixture of hydrocarbon and oxygen) in the closed combustor 114. A tenth pipe 136 is arranged between the gas-liquid separation unit 116 and the carbon oxide storage unit 102. The tenth pipe 136 communicates the gas-liquid separation unit 116 and the carbon oxide storage unit 102. The gas-liquid separation unit 116 supplies (delivers) _{the separated carbon oxide (CO 2 in} FIG. 1) to the carbon oxide storage unit 102 via the tenth pipe 136. The carbon oxide storage unit 102 can store the carbon oxide generated by the closed combustor 114, and supplies the carbon oxide required for driving the hydrocarbon generation device 108 to the hydrocarbon generation device 108 at an arbitrary timing. can do.

The eleventh pipe 138 is arranged between the gas-liquid separation unit 116 and the water storage unit 104. The eleventh pipe 138 communicates the gas-liquid separation unit 116 and the water storage unit 104. The gas-liquid separation unit 116 supplies (delivers) _{the separated water (2H 2} O in FIG. 1) to the water storage unit 104 via the eleventh pipe 138. The water storage unit 104 can store the water (water vapor) generated by the closed combustor 114, and can supply the water required for driving the electrolytic device 106 to the electrolytic device 106 at an arbitrary timing. ..

As described above, the hydrocarbon combustion system 100 transfers the carbon oxide (carbon dioxide: CO ₂ ) generated in the closed combustor 114 to the carbon oxide storage unit 102 (hydrocarbon generator 108) and the water generated in the closed combustor 114. (H ₂ O) is returned to the water storage unit 104 (electrolytic device 106). As a result, the hydrocarbon combustion system 100 forms a closed cycle in which a substance obtained by decomposing and synthesizing carbon oxide and water circulates. The pressure in the closed cycle is atmospheric pressure in the first embodiment. However, the pressure in the closed cycle is not limited to this, and may be higher than the atmospheric pressure. By making the pressure in the closed cycle larger than the atmospheric pressure, the hydrocarbon production efficiency in the hydrocarbon generator 108 and the combustion efficiency in the closed combustor 114 can be improved.

The hydrocarbon combustion system 100 includes a control device 140, a carbon oxide valve 142, a water valve 144, a hydrocarbon valve 146, and an oxygen valve 148. The control device 140 is a microcomputer including a central processing unit (CPU), a ROM in which a program or the like is stored, a RAM as a work area, and the like. The control device 140 controls the entire hydrocarbon combustion system 100.

FIG. 2 is a block diagram showing a schematic configuration of the control device 140 of the first embodiment. As shown in FIG. 2, in the first embodiment, the control device 140 functions as a carbon oxide supply control unit 140a, a water supply control unit 140b, a hydrocarbon supply control unit 140c, and an oxygen supply control unit 140d.

The carbon oxide supply control unit 140a controls the opening degree of the carbon oxide valve 142 via an actuator (not shown). The carbon oxide supply control unit 140a can control the carbon oxide valve 142 in a closed state or an open state.

The water supply control unit 140b controls the opening degree of the water valve 144 via an actuator (not shown). The water supply control unit 140b can control the water valve 144 to a closed state or an open state.

The hydrocarbon supply control unit 140c controls the opening degree of the hydrocarbon valve 146 via an actuator (not shown). The hydrocarbon supply control unit 140c can control the hydrocarbon valve 146 in a closed state or an open state.

The oxygen supply control unit 140d controls the opening degree of the oxygen valve 148 via an actuator (not shown). The oxygen supply control unit 140d can control the oxygen valve 148 to a closed state or an open state.

Returning to FIG. 1, the carbon oxide valve 142 is arranged in the first pipe 118. The opening degree of the carbon oxide valve 142 is controlled by the control device 140 to adjust the amount of _{carbon oxide (CO 2 in FIG. 1) supplied from the carbon oxide storage unit 102 to the hydrocarbon generation device 108.}

The water valve 144 is arranged in the second pipe 120. The opening degree of the water valve 144 is controlled by the control device 140 to adjust the amount of _{water (2H 2} O (4H _{2 O) in FIG. 1) supplied from the water storage unit 104 to the electrolytic device 106.} ..

The hydrocarbon valve 146 is arranged in the eighth pipe 132. The opening degree of the hydrocarbon valve 146 is controlled by the control device 140 to adjust the amount of _{hydrocarbons (CH 4 in FIG. 1) supplied from the hydrocarbon storage unit 112 to the closed combustor 114.}

The oxygen valve 148 is arranged in the fourth pipe 124. The opening degree of the oxygen valve 148 is controlled by the control device 140 to adjust the amount of _{oxygen (2O 2 in FIG. 1) supplied from the electrolytic device 106 to the closed combustor 114.}

That is, the hydrocarbon valve 146 can adjust the supply amount of _{the hydrocarbon (CH 4 in FIG. 1) generated based on the renewable energy to the closed combustor 114.} The hydrocarbon valve 146 can store the hydrocarbon in the hydrocarbon storage unit 112 by reducing the supply amount of the hydrocarbon to the closed combustor 114 when the heat demand is small. Further, the hydrocarbon valve 146 can satisfy the heat demand by opening the stored hydrocarbon and increasing the amount of the hydrocarbon supplied to the closed combustor 114 when the heat demand is large.

Next, the operation and operation of the hydrocarbon combustion system 100 will be described. When the operation of the hydrocarbon combustion system 100 is started, the carbon oxide supply control unit 140a controls the carbon oxide valve 142 in the open state, and the carbon oxide stored in the carbon oxide storage unit 102 (CO in FIG. 1). ₂ ) is supplied to the hydrocarbon generator 108.

Further, the water supply control unit 140b controls the water valve 144 to be in an open state, _{and supplies the water (4H 2} O in FIG. 1) stored in the water storage unit 104 to the electrolyzer 106.

As described above, the electrolytic device 106 is supplied with electric power from a power generation device (not shown). Electrolytic device 106 (in FIG. 1, _4H 2 O) water by applying a voltage to, (in FIG. 1, 4H ₂₎ hydrogen and (in FIG. 1,. 2O ₂₎ oxygen decomposes. The electrolyzer 106 _{supplies hydrogen (4H 2 in} FIG. 1) to the hydrocarbon generator 108 and oxygen (2O _{2 in} FIG. 1) to the closed combustor 114.

The hydrocarbon generator 108 has a methaneation reaction (4H ₂ + CO ₂ → CH _4).
A catalyst that activates + 2H ₂ O) (for example, a nickel (Ni) -based catalyst, a ruthenium (Ru) -based catalyst, a platinum (Pt) -based catalyst, etc.) is contained. A heating device (not shown) is arranged in the hydrocarbon generation device 108. The temperature of the heating device is controlled by the control device 140, and the hydrocarbon generation device 108 is heated until it reaches a predetermined catalyst activation temperature (temperature condition). When the hydrocarbon generator 108 is heated to a predetermined catalyst activation temperature, the catalyst _{reacts carbon oxide (CO 2 in} FIG. 1) with hydrogen (4H _{2 in} FIG. 1) to cause a hydrocarbon (FIG. 1). Medium, CH ₄ ) and water (2H ₂ O in FIG. 1) are produced.

The hydrocarbon generator 108 supplies the hydrocarbon and water to the gas-liquid separation unit 110. At this time, the hydrocarbon and water are cooled by a cooling device (not shown), and the water is converted from a gas (water vapor) to a liquid (water).

The gas-liquid separation unit 110 separates hydrocarbons (CH _{4 in} FIG. 1) and water (2H ₂ O in FIG. 1) into gas and liquid. The gas-liquid separation unit 110 _{supplies the separated hydrocarbon (CH 4 in} FIG. 1) to the hydrocarbon storage unit 112, and supplies the separated water (2H ₂ O in FIG. 1) to the electrolyzer 106.

_{The hydrocarbon storage unit 112 stores hydrocarbons (CH 4 in} FIG. 1) when the hydrocarbon valve 146 is in the closed state. When the hydrocarbon valve 146 is in the open state, the hydrocarbon storage unit 112 _{supplies the hydrocarbon (CH 4 in} FIG. 1) stored inside to the closed combustor 114.

The hydrocarbon supply control unit 140c controls the opening degree of the hydrocarbon valve 146 according to the heat demand of the consumer (for example, the amount of heat required for heat treatment of the heating furnace). By controlling the opening degree of the hydrocarbon valve 146, the amount of hydrocarbons supplied from the hydrocarbon storage unit 112 to the closed combustor 114 is controlled (adjusted).

At this time, the oxygen supply control unit 140d controls the opening degree of the oxygen valve 148 (that is, the supply amount of oxygen) according to the opening degree of the hydrocarbon valve 146 (that is, the supply amount of hydrocarbon). For example, the oxygen supply control unit 140d adjusts the opening degree of the oxygen valve 148 so that _{the oxygen (O 2} ) remaining in the combustion gas after the fuel is burned by the closed combustor 114 is reduced (excluded). (Control.

The closed combustor 114 burns the hydrocarbon supplied from the hydrocarbon storage unit 112 (CH _{4 in} FIG. 1) and the oxygen supplied from the electrolyzer 106 (2O _{2 in} FIG. 1). The closed combustor 114 generates heat by burning _{hydrocarbons (CH 4 in} FIG. 1) and oxygen (2O _2). The closed combustor 114 produces carbon oxide (CO _{2 in} FIG. 1) and water (2H ₂ O) by _{burning hydrocarbons (CH 4 in} FIG. 1) and oxygen (2O _2).

The closed combustor 114 supplies the generated heat to a heat demand unit (for example, a heating furnace) (not shown). The closed combustor 114 supplies the generated carbon oxide (CO _{2 in} FIG. 1) and water (2H ₂ O) to the gas-liquid separation unit 116. At this time, carbon oxide and water are cooled by a cooling device (not shown), and water is converted from gas (water vapor) to liquid (water).

The gas-liquid separation unit 116 separates carbon oxide (CO _{2 in} FIG. 1) and water (2H ₂ O in FIG. 1) into gas-liquid. The gas-liquid separation unit 116 _{supplies the separated carbon oxide (CO 2 in} FIG. 1) to the carbon oxide storage unit 102, and supplies the separated water (2H ₂ O in FIG. 1) to the water storage unit 104.

The carbon oxide supply control unit 140a maintains the opening degree (open state) of the carbon oxide valve 142 after the closed combustor 114 is operated. By maintaining the opening degree of the carbon oxide valve 142, the carbon oxide (CO _{2 in} FIG. 1) supplied from the gas-liquid separation unit 116 to the carbon oxide storage unit 102 produces hydrocarbons from the carbon oxide storage unit 102. It is supplied to the device 108. In this way, the carbon oxide (CO _{2 in} FIG. 1) generated by the closed combustor 114 is passed through the gas-liquid separation unit 116, the carbon oxide storage unit 102, and the carbon oxide valve 142, and the hydrocarbon generator 108. Will be supplied to.

After the operation of the closed combustor 114, the water supply control unit 140b reduces the opening degree of the water valve 144 in the open state. By keeping the water valve 144 in the open state, the water supplied from the gas-liquid separation unit 116 to the water storage unit 104 (2H ₂ O in FIG. 1) is supplied from the water storage unit 104 to the electrolyzer 106. Will be done. In this way, the water generated by the closed combustor 114 (2H ₂ O in FIG. 1) is supplied to the electrolytic device 106 via the gas-liquid separation unit 116, the water storage unit 104, and the water valve 144. It will be.

_{Here, water (2H 2} O in FIG. 1) is supplied to the electrolyzer 106 from the gas-liquid separation unit 110. Therefore, the water supply control unit 140b controls the opening degree of the water valve 144 to be small according to the amount of _{water (2H 2 O in FIG. 1) supplied from the gas-liquid separation unit 110.} Specifically, the water supply control unit 140b controls the opening degree of the water valve 144 to be small, and the amount of water supplied from the water storage unit 104 to the electrolyzer 106 is compared with the amount of water supplied from the water storage unit 104 to the start of operation of the hydrocarbon combustion system 100. It is reduced to about half the amount ( _{from 4H 2} O to 2H _{2 O in FIG. 1).}

Water supplied from the gas-liquid separation unit 110 (2H ₂ O in FIG. 1) and water supplied from the water storage unit 104 (2H ₂ O in FIG. 1) flow into the electrolyzer 106. _{Therefore, the amount of water (4H 2} O = 2H ₂ O + 2H ₂ O) supplied from the gas-liquid separation unit 110 and the water storage unit 104 to the electrolyzer 106 after the operation of the closed combustion combustor 114 is determined by the hydrocarbon combustion system 100. _{The amount of water (4H 2} O in FIG. 1) supplied from the water storage unit 104 to the electrolyzer 106 at the start of the operation is approximately equal to that of the water storage unit 104.

As described above, the hydrocarbon combustion system 100 of the first embodiment _{returns (sends) the carbon oxide (CO 2 in} FIG. 1) generated by the closed combustor 114 to the hydrocarbon generator 108. Further, the hydrocarbon combustion system 100 _{returns (delivers) the water (2H 2} O in FIG. 1) generated by the closed combustor 114 to the electrolyzer 106. _{Further, the hydrocarbon combustion system 100 returns (delivers) the water (2H 2} O in FIG. 1) separated by the gas-liquid separation unit 110 to the electrolyzer 106.

As a result, the hydrocarbon combustion system 100 does not need to supply water to the electrolyzer 106 from outside the system of the hydrocarbon combustion system 100 at any time in order to generate hydrogen and oxygen by the electrolyzer 106. Further, since the hydrocarbon combustion system 100 generates hydrocarbons by the hydrocarbon generation device 108, it is not necessary to supply carbon oxide to the hydrocarbon generation device 108 from outside the system of the hydrocarbon combustion system 100 at any time. Therefore, when the hydrocarbon combustion system 100 generates heat by the closed combustor 114, the cost can be reduced as compared with the case where water or hydrocarbon is supplied from outside the system of the hydrocarbon combustion system 100 at any time. can.

[Second Embodiment]
FIG. 3 is a diagram illustrating a schematic configuration of the hydrocarbon combustion system 200 according to the second embodiment. Components that are substantially the same as the hydrocarbon combustion system 100 of the first embodiment are designated by the same reference numerals and description thereof will be omitted. The hydrocarbon combustion system 200 of the second embodiment is different from the hydrocarbon combustion system 100 of the first embodiment in that it does not include the gas-liquid separation unit 110.

The hydrocarbon combustion system 200 includes a fifth pipe 226 instead of the fifth pipe 126 and the sixth pipe 128 of the first embodiment. Further, the hydrocarbon combustion system 200 includes a seventh pipe 230 instead of the seventh pipe 130 of the first embodiment. The hydrocarbon combustion system 200 includes a hydrocarbon storage unit 212 instead of the hydrocarbon storage unit 112 of the first embodiment.

A fifth pipe 226 is arranged between the hydrocarbon generator 108 and the hydrocarbon storage unit 212. The fifth pipe 226 communicates the hydrocarbon generation device 108 with the hydrocarbon storage unit 212. _{The hydrocarbon generator 108 supplies hydrogen (methane: CH 4 in} FIG. 3) and water (steam: 2H ₂ O in FIG. 3) to the hydrocarbon storage section 212 via the fifth pipe 226.

FIG. 4 is a schematic configuration diagram of the hydrocarbon storage unit 212. As shown in FIG. 4, hydrocarbon (methane: CH _{4 in} FIG. 4) and water (water vapor: 2H ₂ O in FIG. 4) are supplied to the hydrocarbon storage section 212 from the fifth pipe 226.

In the hydrocarbon storage section 212, hydrocarbons (methane) and water (water vapor) are naturally cooled, and water (water vapor) is liquefied. The liquefied water moves vertically below the hydrocarbon storage section 212 and is stored at the bottom of the hydrocarbon storage section 212. Here, the hydrocarbon (methane) does not liquefy even when naturally cooled, and maintains a gaseous state.

Further, a seventh pipe 230 is arranged vertically below the hydrocarbon storage portion 212. The seventh pipe 230 communicates the hydrocarbon storage unit 212 with the electrolyzer 106. Therefore, the liquefied water is introduced into the seventh pipe 230 and returned to the electrolyzer 106 (see FIG. 3) via the seventh pipe 230.

The seventh pipe 230 has a substantially S-shaped curved portion 230a. Liquefied water is constantly stored in the curved portion 230a. That is, the seventh pipe 230 is sealed (water-sealed) by the water in which the curved portion 230a is liquefied. As a result, it is possible to prevent the hydrocarbon (methane) in the hydrocarbon storage portion 212 from being supplied to the electrolytic device 106 via the seventh pipe 230.

Further, the eighth pipe 132 is arranged vertically above the hydrocarbon storage portion 212. The hydrocarbon in the hydrocarbon storage section 212 is introduced into the eighth pipe 132 and supplied to the closed combustor 114 (see FIG. 3) via the eighth pipe 132.

As described above, in the hydrocarbon combustion system 200 of the second embodiment, the hydrocarbon (CH _{4 in} FIG. 3) and water (2H ₂ O in FIG. 3) generated by the hydrocarbon generator 108 are the fifth. It is naturally cooled in the pipe 226 and the hydrocarbon storage section 212. Therefore, the hydrocarbon combustion system 200 does not include a cooling device for cooling _{the hydrocarbon (CH 4 in} FIG. 3) and water (2H _{2 O in FIG. 3) generated by the hydrocarbon generator 108.} You may. Therefore, the cost of the hydrocarbon combustion system 200 can be reduced as compared with the hydrocarbon combustion system 100 of the first embodiment.

[Third Embodiment]
FIG. 5 is a diagram illustrating a schematic configuration of the hydrocarbon combustion system 300 according to the third embodiment. Components that are substantially the same as the hydrocarbon combustion system 100 of the first embodiment and the hydrocarbon combustion system 200 of the second embodiment are designated by the same reference numerals and description thereof will be omitted. The hydrocarbon combustion system 300 of the third embodiment is different from the hydrocarbon combustion system 100 of the first embodiment and the hydrocarbon combustion system 200 of the second embodiment in that it includes a reaction heat supply unit (heat supply unit) 302. ing.

As shown in FIG. 5, a reaction heat supply unit 302 is arranged between the hydrocarbon generation device 108 and the hydrocarbon storage unit 112. The reaction heat supply unit 302 is in contact with the hydrocarbon generator 108 and the hydrocarbon storage unit 112. However, the reaction heat supply unit 302 may not be in contact with the hydrocarbon generation device 108 and the hydrocarbon storage unit 112. For example, the reaction heat supply unit 302 may bring the member (fifth pipe 226) downstream of the hydrocarbon generator 108 into contact with the hydrocarbon storage unit 112. The reaction heat supply unit 302 is composed of, for example, a heat transfer member such as copper, aluminum, or graphite. The reaction heat supply unit 302 supplies the heat generated by the hydrocarbon generator 108 to the hydrocarbon storage unit 112.

The hydrocarbon generator 108 produces hydrocarbons (methane: CH _{4 in} the third embodiment). The metanation reaction in producing methane is an exothermic reaction. The reaction heat supply unit 302 supplies a part of the reaction heat generated by the hydrocarbon generator 108 to the hydrocarbon storage unit 112.

The hydrocarbon storage unit 112 is heated by the heat (reaction heat) supplied from the reaction heat supply unit 302. When the hydrocarbon reservoir 112 is heated, liquefied water hydrocarbon reservoir within 112 (H 2 _O) is vaporized.

As mentioned above, the closed combustor 114 burns hydrocarbons (CH _{4 in} FIG. 5) and oxygen (2O _{2 in} FIG. 5). At this time, the flame temperature of the closed combustor 114 becomes a very high temperature (for example, a temperature of 3000 ° C. or higher), and the closed combustor 114 may be melted.

Therefore, in the third embodiment, the hydrocarbon storage unit 112 supplies water (steam) vaporized by the heat supplied from the reaction heat supply unit 302 to the closed combustor 114. When steam is supplied, the temperature of the closed combustor 114 is lowered by the specific heat of the supplied steam.

As described above, in the third embodiment, the hydrocarbon combustion system 300 includes a reaction heat supply unit 302. As a result, the hydrocarbon combustion system 300 can supply vaporized water (steam) to the closed combustor 114. As a result, the hydrocarbon combustion system 300 can lower the temperature of the closed combustor 114 and suppress the melting damage of the closed combustor 114.

[Fourth Embodiment]
FIG. 6 is a diagram illustrating a schematic configuration of the hydrocarbon combustion system 400 according to the fourth embodiment. Components that are substantially the same as the hydrocarbon combustion system 100 of the first embodiment and the hydrocarbon combustion system 200 of the second embodiment are designated by the same reference numerals and description thereof will be omitted. The hydrocarbon combustion system 400 of the fourth embodiment is different from the hydrocarbon combustion system 100 of the first embodiment and the hydrocarbon combustion system 200 of the second embodiment in that it includes a combustion heat supply unit (heat supply unit) 402. ing.

As shown in FIG. 6, a combustion heat supply unit 402 is arranged between the hydrocarbon storage unit 112 and the closed combustor 114. The combustion heat supply unit 402 is in contact with the hydrocarbon storage unit 112 and the closed combustor 114. However, the combustion heat supply unit 402 does not have to be in contact with the hydrocarbon storage unit 112 and the closed combustor 114. For example, the combustion heat supply unit 402 may bring the member (9th pipe 134) downstream of the closed combustor 114 into contact with the hydrocarbon storage unit 112. The combustion heat supply unit 402 is composed of, for example, a heat transfer member such as copper, aluminum, or graphite. The combustion heat supply unit 402 supplies the heat generated by the closed combustor 114 to the hydrocarbon storage unit 112.

In the closed combustor 114, heat (heat of combustion) is generated by burning _{hydrocarbons (CH 4 in} FIG. 6) and oxygen (2O _{2 in FIG. 6).} The combustion heat supply unit 402 supplies a part of the heat generated by the closed combustor 114 to the hydrocarbon storage unit 112.

The hydrocarbon storage unit 112 is heated by the heat (combustion heat) supplied from the combustion heat supply unit 402. When the hydrocarbon reservoir 112 is heated, liquefied water hydrocarbon reservoir within 112 (H 2 _O) is vaporized.

When the closed combustor 114 burns hydrocarbons (CH _{4 in} FIG. 6) and oxygen (2O _{2 in} FIG. 6), the closed combustion is performed at the combustion flame temperature (for example, a temperature of 3000 ° C. or higher). The vessel 114 may be melted.

In the fourth embodiment, the hydrocarbon storage unit 112 supplies vaporized water (steam) to the closed combustor 114. When steam is supplied, the temperature of the closed combustor 114 is lowered by the specific heat of the supplied steam.

As described above, in the fourth embodiment, the hydrocarbon combustion system 400 includes a combustion heat supply unit 402. As a result, the hydrocarbon combustion system 400 can supply vaporized water (steam) to the closed combustor 114. As a result, the hydrocarbon combustion system 400 can lower the temperature of the closed combustor 114 and suppress the melting damage of the closed combustor 114.

[Fifth Embodiment]
FIG. 7 is a diagram illustrating a schematic configuration of the hydrocarbon combustion system 500 according to the fifth embodiment. Components that are substantially the same as the hydrocarbon combustion system 100 of the first embodiment are designated by the same reference numerals and description thereof will be omitted. The hydrocarbon combustion system 500 of the fifth embodiment has the same configuration as the hydrocarbon combustion system 100 of the first embodiment. However, the control of the carbon oxide valve 142 by the carbon oxide supply control unit 140a (see FIG. 2) is different from that of the first embodiment.

As described above, when the closed combustor 114 burns hydrocarbons (CH _{4 in} FIG. 7) and oxygen (2O _{2 in} FIG. 7), the combustion flame temperature (for example, a temperature of 3000 ° C. or higher) As a result, the closed combustor 114 may be melted and damaged.

In the fifth embodiment, the carbon oxide supply control unit 140a (see FIG. 2) controls the opening degree of the carbon oxide valve 142 according to the temperature of the closed combustor 114, and supplies the hydrocarbon to the hydrocarbon generator 108. The amount of carbon (CO _{2 in} FIG. 7) is controlled.

For example, the hydrocarbon combustion system 500 may include a thermometer (not shown) that measures the temperature of the closed combustor 114. The carbon oxide supply control unit 140a may control the opening degree of the carbon oxide valve 142 based on the output of a thermometer (not shown). Further, the carbon oxide supply control unit 140a may estimate the temperature of the closed combustor 114 based on the opening degree of the hydrocarbon valve 146 (that is, _{the supply amount of CH 4).} The carbon oxide supply control unit 140a may control the opening degree of the carbon oxide valve 142 based on the estimated temperature of the closed combustor 114.

In the fifth embodiment, the carbon oxide supply control unit 140a oxidizes so as to increase the supply amount of carbon oxide supplied to the hydrocarbon generator 108 (“+ nCO ₂ ” in FIG. 7) as compared with the first embodiment. The opening degree of the carbon valve 142 is controlled. In FIG. 7, “+” in “+ nCO ₂ ” indicates that more carbon oxide is supplied in addition to the carbon oxide required for the hydrocarbon generator 108. The "n" in "+ nCO ₂ " indicates the amount of carbon oxide that increases in addition to the carbon oxide required for the hydrocarbon generator 108.

That is, the carbon oxide supply control unit 140a supplies the hydrocarbon generator 108 with more carbon oxide (that is, excess carbon oxide) than the carbon oxide required for the hydrocarbon generator 108. The excess carbon oxide (“+ nCO ₂ ” in FIG. 7) is supplied to the closed combustor 114 via the hydrocarbon generator 108, the gas-liquid separation unit 110, and the hydrocarbon storage unit 112. When the excess carbon oxide is supplied, the temperature of the closed combustor 114 is lowered by the specific heat of the supplied carbon oxide.

The excess carbon oxide (“+ nCO ₂ ” in FIG. 7) supplied to the closed combustor 114 is returned from the closed combustor 114 to the carbon oxide storage section 102 via the gas-liquid separation section 116. That is, the excess carbon oxide circulates in the hydrocarbon generator 108, the gas-liquid separation unit 110, the hydrocarbon storage unit 112, the closed combustor 114, the gas-liquid separation unit 116, and the carbon oxide storage unit 102. The carbon oxide supply control unit 140a includes the hydrocarbon generator 108, the gas-liquid separation unit 110, the hydrocarbon storage unit 112, the closed combustor 114, the gas-liquid separation unit 116, and the amount of carbon oxide circulating in the carbon oxide storage unit 102. To control. That is, the carbon oxide supply control unit 140a controls (adjusts) the circulation amount of carbon oxide _{represented by “+ nCO 2” in FIG. 7.}

As described above, in the fifth embodiment, the carbon oxide supply control unit 140a supplies the closed combustor 114 with excess carbon oxide (“+ nCO ₂ ” in FIG. 7). As a result, the hydrocarbon combustion system 500 can lower the temperature of the closed combustor 114 and suppress the melting damage of the closed combustor 114.

[Sixth Embodiment]
FIG. 8 is a diagram illustrating a schematic configuration of the hydrocarbon combustion system 600 according to the sixth embodiment. The components substantially the same as those of the hydrocarbon combustion system 300 of the third embodiment are designated by the same reference numerals and the description thereof will be omitted. The hydrocarbon combustion system 600 of the sixth embodiment has the same configuration as the hydrocarbon combustion system 300 of the third embodiment. However, the control of the water valve 144 by the water supply control unit 140b (see FIG. 2) is different from that of the third embodiment.

As described above, when the closed combustor 114 burns hydrocarbons (CH _{4 in} FIG. 8) and oxygen (2O _{2 in} FIG. 8), the combustion flame temperature (for example, a temperature of 3000 ° C. or higher) As a result, the closed combustor 114 may be melted and damaged.

In the sixth embodiment, the water supply control unit 140b (see FIG. 2) controls the opening degree of the water valve 144 according to the temperature of the closed combustor 114, and supplies water to the electrolyzer 106 (in FIG. 8). , 2H ₂ O (4H ₂ O)) is controlled.

For example, the hydrocarbon combustion system 600 may include a thermometer (not shown) that measures the temperature of the closed combustor 114. The water supply control unit 140b may control the opening degree of the water valve 144 based on the output of a thermometer (not shown). Further, the water supply control unit 140b may estimate the temperature of the closed combustor 114 based on the opening degree of the hydrocarbon valve 146 (that is, _{the supply amount of CH 4).} The water supply control unit 140b may control the opening degree of the water valve 144 based on the estimated temperature of the closed combustor 114.

In the sixth embodiment, the water supply control unit 140b of the water valve 144 increases the amount of water supplied to the electrolyzer 106 (“+ nH _{2 O” in FIG. 8) as compared with the third embodiment.} The opening is controlled. In FIG. 8, “+” in “+ nH ₂ O” indicates that more water is supplied in addition to the water required for the electrolytic device 106. The “n” in “+ nH ₂ O” indicates the amount of water that increases in addition to the water required for the electrolyzer 106.

That is, the water supply control unit 140b supplies the electrolyzer 106 with more water (that is, excess water) than the water required for the electrolyzer 106. The excess water (“+ nH ₂ O” in FIG. 8) is supplied to the closed combustor 114 via the electrolyzer 106. When excess water is supplied, the temperature of the closed combustor 114 drops by the specific heat of the supplied water.

The excess water (“+ nH ₂ O” in FIG. 8) supplied to the closed combustor 114 is returned from the closed combustor 114 to the water storage unit 104 via the gas-liquid separation unit 116. That is, the excess water circulates in the electrolyzer 106, the closed combustor 114, the gas-liquid separation unit 116, and the water storage unit 104. The water supply control unit 140b controls the amount of water circulating in the electrolyzer 106, the closed combustor 114, the gas-liquid separation unit 116, and the water storage unit 104. That is, the water supply control unit 140b controls (adjusts) the circulation amount of water indicated by _{"+ nH 2 O" in FIG.}

As described above, in the sixth embodiment, the water supply control unit 140b _{causes the closed combustor 114 to supply excess water (“+ nH 2} O” in FIG. 8). As a result, the hydrocarbon combustion system 600 can lower the temperature of the closed combustor 114 and suppress the melting damage of the closed combustor 114.

[7th Embodiment]
FIG. 9 is a diagram illustrating a schematic configuration of the hydrocarbon combustion system 700 according to the seventh embodiment. The components substantially the same as those of the hydrocarbon combustion system 300 of the third embodiment are designated by the same reference numerals and the description thereof will be omitted. The hydrocarbon combustion system 700 of the seventh embodiment is different from the hydrocarbon combustion system 300 of the third embodiment in that it includes a circulation pipe 702, a combustion gas valve 704, and a control device 740 instead of the control device 140. There is.

As shown in FIG. 9, a circulation pipe 702 is connected to the closed combustor 114. One end of the circulation pipe 702 is connected to the upstream side (hydrocarbon storage portion 112 side) of the closed type combustor 114, and the other end is connected to the downstream side (gas-liquid separation part 116 side) of the closed type combustor 114. .. However, one end of the circulation pipe 702 may be connected to the upstream side of the closed combustor 114, and the other end may not be connected to the downstream side of the closed combustor 114. For example, the circulation pipe 702 has one end connected to a member (8th pipe 132) upstream of the closed combustor 114 and the other end connected to a member downstream of the closed combustor 114 (9th pipe 134). May be connected to.

The circulation pipe 702 returns a part of the combustion gas discharged from the downstream side of the closed combustor 114 to the upstream side of the closed combustor 114. Here, in order to recirculate a part of the combustion gas, the circulation pipe 702 may be provided with an ejector (not shown).

Further, a combustion gas valve 704 is arranged in the circulation pipe 702. The opening degree of the combustion gas valve 704 is controlled by the control device 740 to adjust the flow rate of the combustion gas flowing back from the downstream side of the closed combustor 114 to the upstream side of the closed combustor 114.

FIG. 10 is a block diagram showing a schematic configuration of the control device 740 according to the seventh embodiment. As shown in FIG. 10, in the seventh embodiment, the control device 740 functions as a carbon oxide supply control unit 140a, a water supply control unit 140b, a hydrocarbon supply control unit 140c, and a combustion gas supply control unit 740e. ..

The combustion gas supply control unit 740e controls the opening degree of the combustion gas valve 704 via an actuator (not shown). The combustion gas supply control unit 740e can control the combustion gas valve 704 in a closed state or an open state. By controlling the opening degree of the combustion gas valve 704, the combustion gas supply control unit 740e can adjust the flow rate of the combustion gas flowing back from the downstream side of the closed combustor 114 to the upstream side of the closed combustor 114. ..

When the closed combustor 114 burns hydrocarbons (CH _{4 in} FIG. 9) and oxygen (2O _{2 in} FIG. 9), the closed combustion is performed at the combustion flame temperature (for example, a temperature of 3000 ° C. or higher). The vessel 114 may be melted.

In the seventh embodiment, the combustion gas supply control unit 740e controls the opening degree of the combustion gas valve 704 to control the opening degree of the combustion gas (CO ₂ and 4H ₂ O in FIG. 9) generated by the closed combustor 114. A part of it is returned to the upstream side of the closed combustor 114 by a circulation pipe 702. When a part of the combustion gas is supplied, the temperature of the closed combustor 114 is lowered by the specific heat of _{the supplied combustion gas (CO 2} and H _{2 O).}

As described above, in the seventh embodiment, the hydrocarbon combustion system 700 includes a circulation pipe 702, a combustion gas valve 704, and a combustion gas supply control unit 740e. As a result, the hydrocarbon combustion system 700 can supply a part of the combustion gas to the closed combustor 114. As a result, the hydrocarbon combustion system 700 can lower the temperature of the closed combustor 114 and suppress the melting damage of the closed combustor 114.

(8th Embodiment)
FIG. 11 is a diagram illustrating a schematic configuration of the hydrocarbon combustion system 800 according to the eighth embodiment. The components substantially the same as those of the hydrocarbon combustion system 300 of the third embodiment are designated by the same reference numerals and the description thereof will be omitted. The hydrocarbon combustion system 800 of the eighth embodiment is provided with an electrolytic device 806 instead of the electrolytic device 106, a combustion gas storage unit 804 instead of the water storage unit 104, and a combustion gas valve 844 instead of the water valve 144. The third embodiment is different from the third embodiment in that the control device 840 is provided instead of the control device 140.

The combustion gas storage unit 804 stores the combustion gas (carbon dioxide: CO ₂ and water: 3H ₂ O in the eighth embodiment) delivered from the closed combustor 114. _{A predetermined amount of combustion gas (CO 2} and 3H ₂ O in FIG. 11) is stored in the combustion gas storage unit 804 in advance before the hydrocarbon combustion system 800 is operated for the first time. However, when the hydrocarbon combustion system 800 is operated for the first time, a predetermined amount of combustion gas (CO ₂ and 3H ₂ O in FIG. 11) may be supplied to the combustion gas storage unit 804 from the outside. ..

The combustion gas storage unit 804 includes a heating device (not shown). At the start of operation of the hydrocarbon combustion system 800, the heating device charges carbon dioxide (CO _{2 in} FIG. 11) and water (3H ₂ O in FIG. 11) stored in the combustion gas storage unit 804, for example, at 500 ° C. Heat above. The combustion gas storage unit 804 supplies heated carbon dioxide and water (steam) to the electrolyzer 806.

Further, after the operation of the hydrocarbon combustion system 800 is started, the combustion gas storage unit 804 _{supplies the combustion gas (CO 2} , 3H ₂ O in FIG. 11) sent from the closed combustor 114 to the electrolytic device 806. The combustion gas storage unit 804 can supply the carbon oxide and water required for driving the electrolytic device 806 to the electrolytic device 806 at an arbitrary timing.

The electrolytic device 806 is connected to a power generation device (not shown) that generates electric power from renewable energy. Electric power is supplied to the electrolytic device 806 from a power generation device (not shown). _{Further, the combustion gas (CO 2} , 3H ₂ O in FIG. 11) is supplied to the electrolyzer 806 from the combustion gas storage unit 804.

In the eighth embodiment, the electrolyzer 806 is configured to include, for example, a solid oxide fuel cell (SOEC), which electrolyzes (co-electrolyzes) carbon dioxide and water, and hydrogen and monoxide. It can be converted to carbon and oxygen. The electrolyzer 106 uses carbon monoxide (CO in FIG. 11), hydrogen (3H _{2 in} FIG. 11) and oxygen (FIG. 11) from the supplied electric power and combustion gas (CO ₂ , 3H _{2 O in FIG. 11).} In 11, 2O ₂ ) is generated.

The electrolyzer 806 supplies carbon monoxide (CO in FIG. 11) and hydrogen (3H _{2 in} FIG. 11) to the hydrocarbon generator 108 via the third pipe 122. _{Further, the electrolyzer 806 supplies oxygen (2O 2 in} FIG. 11) to the closed combustor 114 via the fourth pipe 124.

The hydrocarbon generator 108 is charged with carbon monoxide (CO in FIG. 11) and hydrogen (3H _{2 in} FIG. 11), hydrocarbon (CH _{4 in} FIG. 11) and water (H in FIG. 11). ₂ O) is generated. In the eighth embodiment, the hydrocarbon generator 108 is producing methane and steam.

Specifically, the hydrocarbon generator 108 is subjected to a meta-nation reaction (3H ₂ + CO →
A catalyst that activates CH ₄ + H ₂ O) (for example, a nickel (Ni) -based catalyst, a ruthenium (Ru) -based catalyst, a platinum (Pt) -based catalyst, etc.) is contained. A heating device (not shown) is arranged in the hydrocarbon generation device 108. The temperature of the heating device is controlled by the control device 840, and the hydrocarbon generation device 108 is heated until it reaches a predetermined catalyst activation temperature (temperature condition). When the hydrocarbon generator 108 is heated to a predetermined catalyst activation temperature, the catalyst _{reacts carbon monoxide (CO in FIG. 11) with hydrogen (3H 2 in} FIG. 11) to cause a hydrocarbon (FIG. 11). Medium, CH ₄ ) and water (H ₂ O in FIG. 11) are produced.

FIG. 12 is a block diagram showing a schematic configuration of the control device 840 of the eighth embodiment. As shown in FIG. 12, in the eighth embodiment, the control device 840 functions as a combustion gas supply control unit 840a and a hydrocarbon supply control unit 140c.

The combustion gas supply control unit 840a controls the opening degree of the combustion gas valve 844 via an actuator (not shown). The combustion gas supply control unit 840a can control the combustion gas valve 844 to a closed state or an open state. The combustion gas supply control unit 840a can adjust the amount of combustion gas supplied from the combustion gas storage unit 804 to the electrolytic device 806 by controlling the opening degree of the combustion gas valve 844. At this time, the combustion gas supply control unit 840a controls the closed combustor 114 to supply excess carbon oxide or water to lower the temperature of the closed combustor 114, as in the fifth and sixth embodiments. You may.

Thus, in the eighth embodiment, the closed combustor 114 _{returns the combustion gas (that is, carbon oxide (CO 2 in} FIG. 11) and water (3H ₂ O in FIG. 11)) to the electrolyzer 806. (Sending).

As a result, the hydrocarbon combustion system 800 needs to supply carbon monoxide and water to the electrolyzer 806 from outside the system of the hydrocarbon combustion system 800 at any time in order to generate carbon monoxide, hydrogen and oxygen by the electrolyzer 806. It disappears. Therefore, the hydrocarbon combustion system 800 can reduce the cost when generating heat by the closed combustor 114 as compared with the case where water or hydrocarbon is supplied from outside the system of the hydrocarbon combustion system 800 at any time. can.

Further, in the hydrocarbon combustion system 800 of the eighth embodiment, the electrolyzer 806 can generate carbon monoxide, hydrogen, and oxygen from the combustion gas. Therefore, the hydrocarbon combustion system 800 does not have a gas-liquid separation unit 116 for separating _{carbon oxide (CO 2 in} FIG. 11) and water (3H _{2 O in FIG. 11) contained in the combustion gas.} May be good. Therefore, the cost of the hydrocarbon combustion system 800 can be reduced as compared with the hydrocarbon combustion system 100 of the first embodiment.

Although the embodiments of the present disclosure have been described above with reference to the accompanying drawings, it goes without saying that the present disclosure is not limited to such embodiments. It is clear to those skilled in the art that various modifications or modifications can be conceived within the scope of the claims, and it is understood that they also naturally belong to the technical scope of the present disclosure. Will be done.

In the first to seventh embodiments, the example in which the hydrocarbon combustion system 100, 200, 300, 400, 500, 600, 700 includes the carbon oxide storage unit 102 has been described. However, the carbon oxide storage unit 102 is not an essential configuration. Therefore, the hydrocarbon combustion systems 100, 200, 300, 400, 500, 600, 700 do not have to include the carbon oxide storage 102.

In the first to seventh embodiments, the example in which the hydrocarbon combustion system 100, 200, 300, 400, 500, 600, 700 includes the carbon oxide valve 142 and the carbon oxide supply control unit 140a has been described. However, the carbon oxide valve 142 and the carbon oxide supply control unit 140a are not essential configurations. Therefore, the hydrocarbon combustion system 100, 200, 300, 400, 500, 600, 700 may not include the carbon oxide valve 142 and the carbon oxide supply control unit 140a.

In the first to seventh embodiments, the example in which the hydrocarbon combustion system 100, 200, 300, 400, 500, 600, 700 includes the water storage unit 104 has been described. However, the water storage unit 104 is not an essential configuration. Therefore, the hydrocarbon combustion systems 100, 200, 300, 400, 500, 600, 700 do not have to include the water reservoir 104.

In the first to seventh embodiments, an example in which the hydrocarbon combustion system 100, 200, 300, 400, 500, 600, 700 includes a water valve 144 and a water supply control unit 140b has been described. However, the water valve 144 and the water supply control unit 140b are not essential configurations. Therefore, the hydrocarbon combustion systems 100, 200, 300, 400, 500, 600, 700 may not include the water valve 144 and the water supply control unit 140b.

In the eighth embodiment, an example in which the hydrocarbon combustion system 800 includes a combustion gas storage unit 804 has been described. However, the combustion gas storage unit 804 is not an essential configuration. Therefore, the hydrocarbon combustion system 800 does not have to include the combustion gas storage unit 804.

In the eighth embodiment, an example in which the hydrocarbon combustion system 800 includes a combustion gas valve 844 and a combustion gas supply control unit 840a has been described. However, the combustion gas valve 844 and the combustion gas supply control unit 840a are not essential configurations. Therefore, the hydrocarbon combustion system 800 does not have to include the combustion gas valve 844 and the combustion gas supply control unit 840a.

Further, the hydrocarbon combustion systems 100, 200, 300, 400, 500, 600, 700 and 800 of each of the above embodiments can be combined. For example, the hydrocarbon combustion system 300 of the third embodiment may include the combustion heat supply unit 402 of the fourth embodiment. Further, the hydrocarbon combustion system 300 of the third embodiment may include the circulation pipe 702 of the seventh embodiment, the combustion gas valve 704, and the combustion gas supply control unit 740e. Further, the hydrocarbon combustion system 800 of the eighth embodiment may include the reaction heat supply unit 302 of the third embodiment. Further, the hydrocarbon combustion system 800 of the eighth embodiment may include the combustion heat supply unit 402 of the fourth embodiment. Further, the hydrocarbon combustion system 800 of the eighth embodiment may include the circulation pipe 702 of the seventh embodiment, the combustion gas valve 704, and the combustion gas supply control unit 740e.

The present disclosure can be used for hydrocarbon combustion systems.

100: Combustion combustion system 102: Carbon oxide storage 104: Water storage 106: Electrolytic device 108: Hydrocarbon generator 112: Carbon dioxide storage 114: Sealed combustor 116: Gas-liquid separation unit (separation unit) 140a : Carbon oxide supply control unit 140b: Water supply control unit 300: Carbon dioxide combustion system 302: Reaction heat supply unit (heat supply unit) 400: Carbon dioxide combustion system 402: Combustion heat supply unit (heat supply unit) 700: Carbon dioxide Combustion system 702: Circulation piping 800: Combustion combustion system 804: Combustion gas storage unit 840a: Combustion gas supply control unit

Claims (11)

An electrolyzer that uses electricity generated from renewable energy to generate hydrogen,
The hydrogen generated by the electrolyzer, a hydrocarbon generator that produces hydrocarbons using carbon dioxide, and the like.
A hydrocarbon storage unit that stores the hydrocarbons generated by the hydrocarbon generator, and
A closed combustor that burns the hydrocarbon taken out from the hydrocarbon reservoir, and
A separation unit that separates carbon dioxide and water generated by the combustion of the hydrocarbon, sends the carbon dioxide to the hydrocarbon generator, and sends the water to the electrolyzer.
Hydrocarbon combustion system with. The hydrocarbon combustion system according to claim 1, further comprising a carbon oxide storage unit that stores the carbon dioxide transmitted from the separation unit. The hydrocarbon combustion according to claim 1 or 2, further comprising the hydrocarbon generator, the hydrocarbon storage unit, the closed combustor, and the carbon oxide supply control unit that controls the amount of carbon dioxide circulating in the separation unit. system. The hydrocarbon combustion system according to any one of claims 1 to 3, further comprising a water storage unit for storing the water sent from the separation unit. The hydrocarbon combustion system according to any one of claims 1 to 4, further comprising the electrolyzer, the closed combustor, and a water supply control unit that controls the amount of water circulating in the separation unit. An electrolyzer that produces hydrogen and carbon monoxide using electricity generated from renewable energy,
A hydrocarbon generator that produces a hydrocarbon using the hydrogen generated by the electrolyzer and the carbon monoxide, and a hydrocarbon generator.
A hydrocarbon storage unit that stores the hydrocarbons generated by the hydrocarbon generator, and
A closed combustor that burns the hydrocarbon taken out from the hydrocarbon reservoir and sends carbon dioxide and water to the electrolyzer.
Hydrocarbon combustion system with. The hydrocarbon combustion system according to claim 6, further comprising a combustion gas storage unit for storing the carbon dioxide and the water delivered from the closed combustor. 6. Hydrocarbon combustion system. The hydrocarbon combustion system according to any one of claims 1 to 8, further comprising a heat supply unit that supplies heat generated by the hydrocarbon generator to the hydrocarbon storage unit. The hydrocarbon combustion system according to any one of claims 1 to 9, further comprising a heat supply unit that supplies heat generated by the closed combustor to the hydrocarbon storage unit. The hydrocarbon combustion system according to any one of claims 1 to 10, further comprising a circulation pipe for refluxing a part of the combustion gas discharged from the downstream side of the closed combustor to the upstream side of the closed combustor. ..

Images