Waste incineration facility and waste incineration method

Abstract

The present invention relates to a waste incineration facility and a waste incineration method. This waste incineration facility comprises: a steam turbine generator to which superheated steam is supplied; and a solid oxide electrolysis cell that electrolyzes steam.

Description

Waste incineration equipment and waste incineration method

[0001] The present invention relates to a waste incineration facility and a waste incineration method.

[0002] A thermal recycling system is known in waste incineration facilities, where thermal energy generated by the combustion of waste (e.g., various types of garbage) is used to generate electricity. For example, high-temperature flue gas produced by the combustion of waste is used to generate superheated steam. The generated superheated steam is supplied to a steam turbine generator, which generates electricity. The electricity generated by the steam turbine generator can generally be sold to an electric power company.

[0003] Japanese Patent Application Laid-Open No. 2023-169698

[0004] However, as renewable energy becomes more widespread in the future, there may be times when the generated electricity cannot be sold. In such cases, it may be necessary to discard the generated superheated steam or intentionally operate the waste incineration facility at a low load. As a result, the waste incineration facility may not be able to use the energy effectively and may end up wasting it.

[0005] Therefore, an object of the present invention is to provide a waste incineration facility and a waste incineration method that can effectively utilize the energy generated.

[0006] In one aspect, a waste incineration facility is provided, comprising: an incinerator for combusting waste; a waste heat boiler for generating superheated steam from saturated steam by heat exchange between combustion exhaust gas from the incinerator and the saturated steam; a steam turbine generator to which the superheated steam is supplied; and a solid oxide electrolysis cell for electrolyzing the steam.

[0007] In one aspect, the waste incineration facility includes a steam heater that generates saturated steam, and the solid oxide electrolysis cell is configured to electrolyze the saturated steam supplied from the steam heater. In one aspect, the waste heat boiler includes a high-temperature heat exchanger that performs heat exchange between combustion exhaust gas from the incinerator and a fluid to heat the fluid, and the waste incineration facility includes an independent superheater that performs heat exchange between the superheated steam and the heated fluid to heat the superheated steam, and the high-temperature heat exchanger is configured to supply the heated fluid to the solid oxide electrolysis cell. In one aspect, the high-temperature heat exchanger is configured to supply the heated fluid to the solid oxide electrolysis cell through the independent superheater.

[0008] In one aspect, the waste heat boiler includes a high-temperature heat exchanger that heats a fluid by exchanging heat between the combustion exhaust gas from the incinerator and the fluid, and the waste incineration facility includes a steam heater that generates saturated steam, a saturated steam superheater that superheats the saturated steam generated by the steam heater, and an independent superheater that heats the superheated steam by exchanging heat between the superheated steam and the heated fluid, and the solid oxide electrolysis cell is configured to electrolyze the superheated saturated steam supplied from the saturated steam superheater. In one aspect, the high-temperature heat exchanger is configured to supply the heated fluid to the saturated steam superheater. In another aspect, the high-temperature heat exchanger is configured to supply the heated fluid to the solid oxide electrolysis cell.

[0009] In one aspect, the high-temperature heat exchanger is configured to supply the heated fluid to the solid oxide electrolysis cell through the independent superheater. In one aspect, the waste heat boiler includes a high-temperature heat exchanger that heats the fluid by exchanging heat between the combustion exhaust gas from the incinerator and a fluid, and the high-temperature heat exchanger is configured to supply the heated fluid to the solid oxide electrolysis cell. In one aspect, the waste incineration facility includes a turbine extraction steam superheater that heats steam extracted from the steam turbine generator, and the high-temperature heat exchanger is configured to supply the heated fluid to the turbine extraction steam superheater.

[0010] In one aspect, the solid oxide electrolysis cell is configured to electrolyze the superheated steam supplied from the steam turbine generator. In one aspect, the waste heat boiler includes a high-temperature heat exchanger that performs heat exchange between the combustion exhaust gas from the incinerator and a fluid to heat the fluid, the waste incineration facility includes an independent superheater that performs heat exchange between the superheated steam and the heated fluid to heat the superheated steam, and the high-temperature heat exchanger is configured to supply the heated fluid to the solid oxide electrolysis cell through the independent superheater. In one aspect, the waste heat boiler is equipped with a high-temperature heat exchanger that heats the fluid by performing heat exchange between the combustion exhaust gas from the incinerator and the fluid, and the waste incineration facility is equipped with an independent superheater that heats the superheated steam by performing heat exchange between the superheated steam and the heated fluid, and a turbine extraction steam superheater that heats steam extracted from the steam turbine generator, and the high-temperature heat exchanger is configured to supply the heated fluid to the turbine extraction steam superheater through the independent superheater.

[0011] In one aspect, the high-temperature heat exchanger is configured to supply the heated fluid to the solid oxide electrolysis cell through the independent superheater. In one aspect, the waste heat boiler includes a high-temperature heat exchanger that heats the fluid by exchanging heat between the combustion exhaust gas from the incinerator and the fluid, and the waste incineration facility includes a turbine extraction steam superheater that heats steam extracted from the steam turbine generator, and the high-temperature heat exchanger is configured to supply the heated fluid to the turbine extraction steam superheater. In one aspect, the solid oxide electrolysis cell is configured to supply oxygen gas produced by the electrolysis as combustion gas to the incinerator. In one aspect, the waste incineration facility includes a carbon dioxide recovery facility that recovers carbon dioxide in the combustion exhaust gas generated from the waste combusted with the oxygen gas.

[0012] In one aspect, a method for incinerating waste is provided, comprising: combusting waste in an incinerator; generating superheated steam from the saturated steam in a waste heat boiler by exchanging heat between a combustion exhaust gas from the incinerator and saturated steam; supplying the superheated steam to a steam turbine generator; and electrolyzing the steam in a solid oxide electrolysis cell.

[0013] The waste incineration facility includes a steam turbine generator that receives superheated steam and a solid oxide electrolysis cell that electrolyzes the steam. Therefore, the waste incineration facility can effectively utilize energy without wasting it.

[0014] FIG. 1 is a schematic diagram showing one embodiment of a waste incineration facility. FIG. 2 is a schematic diagram showing another embodiment of a waste incineration facility. FIG. 3 is a schematic diagram showing another embodiment of a waste incineration facility. FIG. 4 is a schematic diagram showing another embodiment of a waste incineration facility. FIG. 5 is a schematic diagram showing another embodiment of a waste incineration facility. FIG. 6 is a schematic diagram showing another embodiment of a waste incineration facility. FIG. 7 is a schematic diagram showing another embodiment of a waste incineration facility. FIG. 8 is a schematic diagram showing another embodiment of a waste incineration facility. FIG. 9 is a schematic diagram showing another embodiment of a waste incineration facility. FIG. 10 is a schematic diagram showing another embodiment of a waste incineration facility. FIG. 11 is a schematic diagram showing another embodiment of a waste incineration facility.

[0015] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings described below, identical or corresponding components are designated by the same reference numerals, and duplicated descriptions will be omitted. In the multiple embodiments described below, the configuration of an embodiment that is not particularly described is the same as that of other embodiments, and therefore duplicated descriptions will be omitted.

[0016] Fig. 1 is a schematic diagram showing one embodiment of a waste incineration facility. As shown in Fig. 1, the waste incineration facility includes an incinerator 11 that combusts waste (e.g., various types of garbage), a waste heat boiler 13 that generates superheated steam from saturated steam by performing heat exchange between combustion exhaust gas from the incinerator 11 and saturated steam, and a solid oxide electrolysis cell (i.e., SOEC: Solid Oxide Electrolysis Cell) 100 that electrolyzes the steam. Hereinafter, the solid oxide electrolysis cell 100 may be referred to as SOEC 100.

[0017] The incinerator 11 is a facility for burning waste supplied from a feeder (not shown). High-temperature combustion exhaust gas generated by the combustion of the waste is discharged to a waste heat boiler 13. The waste heat boiler 13 is a facility for recovering thermal energy from the combustion exhaust gas. Hereinafter, the combustion exhaust gas may be simply referred to as exhaust gas.

[0018] As shown in FIG. 1, the waste incineration facility includes an exhaust gas treatment facility 16 for detoxifying the exhaust gas that has passed through a waste heat boiler 13, a moisture recovery facility 110 for cooling the exhaust gas that has been treated by the exhaust gas treatment facility 16 and recovering (removing) moisture contained in the exhaust gas, and a carbon dioxide (CO ) recovery facility 110 for recovering (removing) moisture contained in the exhaust gas from which moisture has been removed by the moisture recovery facility 110. ２ and a chimney 20 for releasing the exhaust gas from which carbon dioxide has been removed by the carbon dioxide recovery facility 120 into the atmosphere.

[0019] Although not shown, the exhaust gas treatment equipment 16 may include an economizer for recovering thermal energy from the exhaust gas that has passed through the waste heat boiler 13, a temperature reducing tower for rapidly lowering the temperature of the exhaust gas, and a dust collector (e.g., a bag filter) for capturing ash contained in the exhaust gas.

[0020] As described above, the waste heat boiler 13 is configured to generate superheated steam from saturated steam. In the embodiment shown in Fig. 1, the waste heat boiler 13 includes a superheater 21 for generating superheated steam from saturated steam using high-temperature exhaust gas.

[0021] The superheater 21 is configured to generate superheated steam from saturated steam by performing heat exchange between saturated steam supplied to the superheater 21 from the outside and high-temperature exhaust gas supplied from the incinerator 11.

[0022] The waste incineration facility includes a steam turbine generator 15 to which superheated steam generated in a superheater 21 is supplied, and a connection line CL1 that connects the superheater 21 and the steam turbine generator 15. The superheated steam generated in the superheater 21 is supplied to the steam turbine generator 15 through the connection line CL1.

[0023] The steam turbine generator 15 is configured to generate electric power by being driven by the superheated steam supplied from the superheater 21. A portion of the electric power (electricity) generated by the steam turbine generator 15 is supplied to the outside and effectively utilized (for example, sold).

[0024] 1, the waste incineration facility includes a connection line CL2 connecting the steam turbine generator 15 and the SOEC 100. The remaining power (i.e., excess energy) generated by the steam turbine generator 15 is supplied to the SOEC 100 through the connection line CL2.

[0025] The SOEC 100 generates high-temperature water vapor (H ２ O) to hydrogen (H ２ ) and oxygen (O ２ ) is electrolyzed. In the SOEC 100, high-temperature steam in the temperature range of about 600°C to 1000°C is used, thereby reducing the power required for electrolysis. The temperature range of the steam to be supplied is not limited to the above temperature range. For example, saturated steam (i.e., saturated steam) may be used. The configuration for supplying saturated steam to the SOEC 100 will be described later.

[0026] A portion of the superheated steam supplied to the steam turbine generator 15 is supplied to the SOEC 100 through a connection line CL2. The SOEC 100 is configured to electrolyze the superheated steam supplied from the steam turbine generator 15 by utilizing the electric power supplied from the steam turbine generator 15.

[0027] In this manner, the SOEC 100 generates hydrogen and oxygen through electrolysis. The generated hydrogen is supplied to an external source for effective use (e.g., sale). In one embodiment, the SOEC 100 may generate hydrogen and carbon monoxide (CO) by electrolyzing superheated steam supplied to the SOEC 100 together with carbon dioxide (co-electrolysis).

[0028] In this case, the waste incineration plant will use the hydrogen and carbon monoxide produced (and oxygen (O ２ The waste incineration facility may include a methanation facility (not shown) for methanating the waste stream from the SOEC 100 to produce synthetic methane.

[0029] Meanwhile, the generated oxygen is supplied from the SOEC 100 to the incinerator 11. In the embodiment shown in Fig. 1, the waste incineration facility includes a return line RL1 connecting the SOEC 100 and the incinerator 11. The SOEC 100 supplies the oxygen generated by electrolysis to the incinerator 11 through the return line RL1 as a high-concentration combustion gas (more specifically, oxygen gas).

[0030] By using the oxygen gas supplied from the SOEC 100 as combustion gas, it is possible to reduce the amount of air used for combustion gas and reduce the amount of exhaust gas. Furthermore, this configuration can increase the carbon dioxide concentration in the exhaust gas, thereby improving the efficiency of carbon dioxide capture by the carbon dioxide capture equipment 120. In one embodiment, the carbon dioxide captured by the carbon dioxide capture equipment 120 may be used in the methanation equipment.

[0031] When the combustion gas is oxygen gas, the carbon dioxide recovery equipment 120 may be an equipment that recovers all of the exhaust gas. When the combustion gas contains air, the carbon dioxide recovery equipment 120 may be an equipment that recovers carbon dioxide by an amine absorption method.

[0032] According to this embodiment, the waste incineration facility includes an SOEC 100 that generates hydrogen and oxygen by electrolyzing superheated steam, thereby enabling the waste incineration facility to effectively utilize thermal energy without wasting it.

[0033] For example, there may be times when the electricity generated by a waste incineration facility cannot be sold. During such times, the waste incineration facility can produce hydrogen and oxygen from the excess energy by supplying superheated steam to the SOEC 100, without having to discard the superheated steam or operate at a low load to reduce the amount of superheated steam generated.

[0034] Fig. 2 is a schematic diagram showing another embodiment of a waste incineration facility. In the embodiment shown in Fig. 2, a waste heat boiler 13 includes a high-temperature heat exchanger 12 that exchanges heat between the exhaust gas from the incinerator 11 and a fluid (e.g., air) to heat the fluid.

[0035] As shown in Figure 2, the waste incineration facility is equipped with an independent superheater 14 that heats superheated steam by performing heat exchange between the superheated steam generated in the superheater 21 and a fluid heated in the high-temperature heat exchanger 12, and a turbine extraction steam superheater 130 that heats steam extracted from a steam turbine generator 15 through the independent superheater 14.

[0036] The waste incineration facility includes a connection line CL1a connecting the superheater 21 and the independent superheater 14, a connection line CL1b connecting the independent superheater 14 and the steam turbine generator 15, a connection line CL2a connecting the steam turbine generator 15 and the turbine extraction steam superheater 130, and a connection line CL2b connecting the turbine extraction steam superheater 130 and the SOEC 100.

[0037] The high-temperature heat exchanger 12 is configured to heat a fluid (e.g., air) by heat exchange with the exhaust gas from the incinerator 11, and to supply the heated high-temperature fluid to the independent superheater 14. The waste incineration facility is equipped with a connection line CL3 that connects the high-temperature heat exchanger 12 and the independent superheater 14. The fluid heated by the high-temperature heat exchanger 12 is supplied to the independent superheater 14 through the connection line CL3.

[0038] The high-temperature heat exchanger 12 is configured to supply the heated fluid to the turbine extraction steam superheater 130 through the independent superheater 14. The waste incineration facility includes a connection line CL4 connecting the independent superheater 14 and the turbine extraction steam superheater 130, and a circulation device (e.g., a circulation fan) 31 attached to the connection line CL4. The circulation device 31 is configured to supply the fluid supplied to the independent superheater 14 to the turbine extraction steam superheater 130 through the connection line CL4.

[0039] The superheated steam heated by the superheater 21 is supplied to the independent superheater 14 through a connection line CL1a. The independent superheater 14 is configured to further heat the superheated steam by heat exchange between the superheated steam and a fluid supplied to the independent superheater 14 through a connection line CL3. The superheated steam heated by the independent superheater 14 is supplied to the steam turbine generator 15 through a connection line CL1b. The steam turbine generator 15 is driven by the superheated steam and generates electricity.

[0040] The waste incineration facility includes a connection line CL5 that connects the steam turbine generator 15 and the SOEC 100. A portion of the electric power generated by the steam turbine generator 15 is supplied to the SOEC 100 through the connection line CL5 and is used for electrolysis in the SOEC 100. A portion of the superheated steam supplied to the steam turbine generator 15 is supplied to the turbine extraction steam superheater 130 through a connection line CL2a.

[0041] The fluid heated by the high-temperature heat exchanger 12 is supplied to the independent superheater 14 through a connection line CL3. The fluid supplied to the independent superheater 14 further heats the superheated steam supplied from the superheater 21 through heat exchange, and the superheated steam is supplied to the turbine extraction steam superheater 130 through a connection line CL4.

[0042] The turbine extraction steam superheater 130 is configured to further heat the superheated steam supplied through the connection line CL2a with the fluid supplied through the connection line CL4. In this manner, the superheated steam supplied to the turbine extraction steam superheater 130 is supplied to the SOEC 100 through the connection line CL2b.

[0043] The high-temperature heat exchanger 12 is configured to supply the heated fluid through the independent superheater 14 to the turbine extraction steam superheater 130 as well as to the SOEC 100. More specifically, the waste incineration facility includes a branch line BL1 that branches off from the connection line CL4 and is connected to the SOEC 100. Therefore, a portion of the fluid flowing through the connection line CL4 is supplied to the SOEC 100 through the branch line BL1.

[0044] In order to improve the efficiency of electrolysis by the SOEC 100, it is necessary to maintain the temperature of the SOEC 100 at a very high temperature (for example, approximately 700°C to 1000°C). In this embodiment, the waste incineration facility is configured to supply superheated steam heated by the turbine extraction steam superheater 130 and fluid flowing through the branch line BL1 to the SOEC 100. With this configuration, the waste incineration facility can maintain the temperature of the SOEC 100 at a higher temperature, thereby improving the efficiency of electrolysis by the SOEC 100.

[0045] 2, the waste incineration facility includes a return line RL2 connecting the SOEC 100 and the high-temperature heat exchanger 12, and a return line RL3 connecting the turbine extraction steam superheater 130 and the high-temperature heat exchanger 12. In this embodiment, the return line RL3 is connected to the return line RL2, and the fluid flowing through the return line RL3 merges with the fluid flowing through the return line RL2.

[0046] A portion of the fluid supplied to the SOEC 100 through the branch line BL1 is returned to the high-temperature heat exchanger 12 through the return line RL2. Similarly, a portion of the fluid supplied to the turbine extraction steam superheater 130 through the connecting line CL4 is returned to the high-temperature heat exchanger 12 through the return line RL3 (and the return line RL2).

[0047] The fluid returned to the high-temperature heat exchanger 12 is heated again by the high-temperature heat exchanger 12 and supplied to the independent superheater 14 through the connection line CL3. The fluid supplied to the independent superheater 14 is again supplied to the turbine extraction steam superheater 130 and the SOEC 100 through the connection line CL4 and the branch line BL1, respectively.

[0048] Fig. 3 is a schematic diagram showing another embodiment of a waste incineration system. In the embodiment shown in Fig. 3, the waste incineration system does not include the turbine extraction steam superheater 130 and return line RL3 of the above-described embodiment, but includes an independent superheater 14 and a connection line CL6 connecting the independent superheater 14 and the SOEC 100. A circulation device 31 is connected to the connection line CL6.

[0049] The waste heat boiler 13 includes a high-temperature heat exchanger 12. The high-temperature heat exchanger 12 supplies fluid heated by itself to an independent superheater 14 through a connecting line CL3, and the fluid supplied to the independent superheater 14 is supplied to the SOEC 100 through a connecting line CL6. A portion of the fluid supplied to the SOEC 100 is returned to the high-temperature heat exchanger 12 through a return line RL2.

[0050] Fig. 4 is a schematic diagram showing another embodiment of a waste incineration facility. In the embodiment shown in Fig. 4, the waste incineration facility includes a turbine extraction steam superheater 130 and a return line RL7 connecting the turbine extraction steam superheater 130 and the high-temperature heat exchanger 12, but does not include the branch line BL1 and the return lines RL2 and RL3 shown in the embodiment described with reference to Fig. 2.

[0051] The waste heat boiler 13 includes a high-temperature heat exchanger 12. The high-temperature heat exchanger 12 supplies heated fluid to the turbine extraction steam superheater 130 through an independent superheater 14 (and connecting lines CL3 and CL4). A portion of the fluid supplied to the turbine extraction steam superheater 130 is returned to the high-temperature heat exchanger 12 through a return line RL7.

[0052] Fig. 5 is a schematic diagram showing another embodiment of a waste incineration system, which includes an independent superheater 14 and a turbine extraction steam superheater 130, and a waste heat boiler 13 including a high-temperature heat exchanger 12.

[0053] In this embodiment, the high-temperature heat exchanger 12 is configured to supply the heated fluid not only to the independent superheater 14 but also directly to the SOEC 100. More specifically, the waste incineration facility includes a branch line BL2 that branches off from the connection line CL3 and is connected to the SOEC 100. Therefore, the fluid heated by the high-temperature heat exchanger 12 is supplied to the independent superheater 14 through the connection line CL3, and is also supplied directly to the SOEC 100 through the branch line BL2.

[0054] According to this embodiment, the fluid passing through the branch line BL2 is supplied to the SOEC 100 without passing through the independent superheater 14. Therefore, the fluid is supplied to the SOEC 100 while maintaining a high temperature (for example, about 700°C) without being reduced in temperature by heat exchange with superheated steam in the independent superheater 14. With this configuration, the waste incineration facility can maintain the temperature of the SOEC 100 at a high temperature, thereby improving the efficiency of electrolysis in the SOEC 100.

[0055] As shown in Figure 5, the waste incineration facility is provided with a branch line BL3 that branches off from the branch line BL2 and is connected to the turbine extraction steam superheater 130. Therefore, a portion of the fluid flowing through the branch line BL2 is supplied to the turbine extraction steam superheater 130 through the branch line BL3. With this configuration, the fluid is supplied to the turbine extraction steam superheater 130 while maintaining a high temperature, without being lowered in temperature by heat exchange with the superheated steam in the independent superheater 14.

[0056] 5, the waste incineration facility includes a return line RL4 connecting the independent superheater 14 and the high-temperature heat exchanger 12, a return line RL5 for returning a portion of the fluid supplied to the SOEC 100 to the high-temperature heat exchanger 12 through the return line RL4, and a return line RL6 for returning a portion of the fluid supplied to the turbine extraction steam superheater 130 to the high-temperature heat exchanger 12 through the return line RL4. The return lines RL5 and RL6 are connected to the return line RL4.

[0057] The circulation device 31 is attached to the return line RL4. The fluid supplied to the independent superheater 14 through the connection line CL3 is returned to the high-temperature heat exchanger 12 through the return line RL4 by the circulation device 31. A portion of the fluid supplied to the SOEC 100 joins the return line RL4 through the return line RL5. A portion of the fluid supplied to the turbine extraction steam superheater 130 joins the return line RL4 through the return line RL6.

[0058] Fig. 6 is a schematic diagram showing another embodiment of a waste incineration facility. In the embodiment shown in Fig. 6, the waste incineration facility does not include the turbine extraction steam superheater 130, the branch line BL3, and the return line RL6, as compared to the embodiment described with reference to Fig. 5. Therefore, the waste incineration facility supplies all of the fluid flowing through the branch line BL2 to the SOEC 100.

[0059] Fig. 7 is a schematic diagram showing another embodiment of a waste incineration system. In the embodiment shown in Fig. 7, a waste heat boiler 13 includes a high-temperature heat exchanger 12. The waste incineration system includes a turbine extraction steam superheater 130 and a branch line BL4 branching off from the connection line CL3 and connected to the turbine extraction steam superheater 130.

[0060] The high-temperature heat exchanger 12 supplies the heated fluid directly to the turbine extraction steam superheater 130 through the connection line CL3 and the branch line BL4. Therefore, the fluid flowing through the branch line BL4 is not lowered in temperature by heat exchange with the superheated steam in the independent superheater 14, and is supplied to the turbine extraction steam superheater 130 while maintaining a high temperature.

[0061] As described above, the SOEC 100 may be configured to electrolyze saturated steam into hydrogen and oxygen using power supplied thereto. In the following embodiment, a waste incineration system including the SOEC 100 that electrolyzes saturated steam will be described. Note that, among the following embodiments, the configuration of an embodiment that is not specifically described is the same as that of the other embodiments, and therefore, a redundant description thereof will be omitted.

[0062] Fig. 8 is a schematic diagram showing another embodiment of a waste incineration system, which includes a steam heater 150 that generates saturated steam and a connection line CL7 that connects the steam heater 150 and the SOEC 100.

[0063] The saturated steam generated in the steam heater 150 is supplied to the SOEC 100 through a connection line CL7. The SOEC 100 is configured to electrolyze the saturated steam supplied from the steam heater 150 using electric power supplied from the steam turbine generator 15 through a connection line CL2.

[0064] According to this embodiment, the waste incineration facility is equipped with an SOEC 100 that generates hydrogen and oxygen using the electric power supplied from the steam turbine generator 15. Therefore, the waste incineration facility can effectively utilize electric energy without wasting it.

[0065] Fig. 9 is a schematic diagram showing another embodiment of a waste incineration facility. In the embodiment shown in Fig. 9, the waste incineration facility is equipped with a saturated steam superheater 160 that superheats the saturated steam generated by the steam heater 150. The saturated steam superheater 160 is a device for generating high-temperature (approximately 300°C) superheated saturated steam from the saturated steam.

[0066] The waste incineration facility includes a connection line CL9 that connects the saturated steam superheater 160 and the SOEC 100. Therefore, the saturated steam superheater 160 supplies superheated saturated steam to the SOEC 100 through the connection line CL9. The SOEC 100 is configured to electrolyze the superheated saturated steam supplied from the saturated steam superheater 160.

[0067] Furthermore, the high-temperature heat exchanger 12 is configured to supply the heated fluid to the saturated steam superheater 160 and the SOEC 100 through the independent superheater 14. More specifically, the waste incineration facility includes a connection line CL10 that connects the independent superheater 14 and the saturated steam superheater 160, and a branch line BL7 that branches off from the connection line CL10 and is connected to the SOEC 100.

[0068] Therefore, the fluid supplied to the independent superheater 14 is supplied to the superheater 160 through the connection line CL10. Furthermore, a portion of the fluid supplied from the independent superheater 14 is supplied to the SOEC 100 through the branch line BL7.

[0069] 9, the waste incineration facility includes a return line RL8 that connects the saturated steam superheater 160 and the high-temperature heat exchanger 12. In this embodiment, the return line RL8 is connected to the return line RL2, and the fluid flowing through the return line RL8 merges with the fluid flowing through the return line RL2.

[0070] Fig. 10 is a schematic diagram showing another embodiment of a waste incineration facility. In the embodiment shown in Fig. 10, the waste incineration facility does not include a saturated steam superheater 160 and a return line RL8, but includes a connection line CL6 connecting the independent superheater 14 and the SOEC 100. In this embodiment, the high-temperature heat exchanger 12 is configured to supply heated fluid to the SOEC 100 through the independent superheater 14 and the connection line CL6.

[0071] 11, the waste incineration facility includes a saturated steam superheater 160 and a return line RL9 connecting the saturated steam superheater 160 and the high-temperature heat exchanger 12, but does not include a branch line BL7 and return lines RL2 and RL8. The waste incineration facility includes a connection line CL8 connecting the steam heater 150 and the saturated steam superheater 160.

[0072] The high-temperature heat exchanger 12 supplies the heated fluid to the saturated steam superheater 160 through the independent superheater 14 (and connecting lines CL3 and CL10). A portion of the fluid supplied to the saturated steam superheater 160 is returned to the high-temperature heat exchanger 12 through a return line RL9.

[0073] Fig. 12 is a schematic diagram showing another embodiment of a waste incineration facility. In the embodiment shown in Fig. 12, the waste incineration facility includes a branch line BL5 branching from the branch line BL4 and connected to the saturated steam superheater 160, and a return line RL10 for returning a portion of the fluid supplied to the saturated steam superheater 160 to the high-temperature heat exchanger 12 via the return line RL4.

[0074] The return line RL5 and the return line RL10 are connected to the return line RL4. A portion of the fluid flowing through the branch line BL4 is supplied to the saturated steam superheater 160 through the branch line BL5.

[0075] Fig. 13 is a schematic diagram showing another embodiment of a waste incineration facility. In the embodiment shown in Fig. 13, the waste heat boiler 13 includes a high-temperature heat exchanger 12, and the waste incineration facility includes an independent superheater 14, but does not include a saturated steam superheater 160, branch line BL5, or return line RL10 (see Fig. 12). Therefore, the waste incineration facility supplies all of the fluid flowing through branch line BL2 to the SOEC 100.

[0076] Fig. 14 is a schematic diagram showing another embodiment of a waste incineration system. In the embodiment shown in Fig. 14, the waste incineration system includes a saturated steam superheater 160 and a branch line BL6 branching off from the connection line CL3 and connected to the saturated steam superheater 160. The high-temperature heat exchanger 12 supplies heated fluid directly to the saturated steam superheater 160 through the connection line CL3 and the branch line BL6.

[0077] As described with reference to the above-mentioned embodiments, the waste incineration facility has at least one of the following configurations A to B. Configuration A: A configuration in which superheated steam generated in the superheater 21 is supplied to the SOEC 100 via the steam turbine generator 15 (see, for example, FIG. 1). Configuration B: A configuration in which superheated steam heated in the turbine extraction steam superheater 130 is supplied to the SOEC 100 (see, for example, FIG. 2). Configuration C: A configuration in which saturated steam generated in the steam heater 150 is supplied to the SOEC 100 (see, for example, FIG. 8). Configuration D: A configuration in which superheated saturated steam heated in the saturated steam superheater 160 is supplied to the SOEC 100 (see, for example, FIG. 9).

[0078] The above-described embodiments have been described for the purpose of enabling a person of ordinary skill in the art to practice the present invention. Various modifications of the above-described embodiments would be obvious to a person skilled in the art, and the technical concept of the present invention may be applied to other embodiments. Therefore, the present invention is not limited to the described embodiments, but is to be interpreted in the broadest scope in accordance with the technical concept defined by the claims.

[0079] The present invention can be used in waste incineration facilities and waste incineration methods.

[0080] REFERENCE SIGNS LIST 11 incinerator 12 high-temperature heat exchanger 13 waste heat boiler 14 independent superheater 15 steam turbine generator 16 exhaust gas treatment equipment 20 chimney 21 superheater 31 circulation device 100 solid oxide electrolysis cell (SOEC) 110 moisture recovery equipment 120 carbon dioxide recovery equipment 130 turbine extraction steam superheater 150 steam heater 160 saturated steam superheater CL1, CL1a, CL1b connection lines CL2, CL2a, CL2b connection lines CL3, CL4, CL5, CL6 connection lines CL7, CL8, CL9, CL10 connection lines RL1, RL2, RL3, RL4, RL5, RL6, RL7 return lines RL8, RL9, RL10 return lines BL1, BL2, BL3, BL4 branch lines BL5, BL6, BL7 branch lines

Claims

1. A waste incineration facility comprising: an incinerator for burning waste; a waste heat boiler for generating superheated steam from saturated steam by exchanging heat between the combustion exhaust gas from the incinerator and the saturated steam; a steam turbine generator to which the superheated steam is supplied; and a solid oxide electrolysis cell for electrolyzing the steam.

2. The waste incineration facility according to claim 1, wherein the waste incineration facility includes a steam heater that generates saturated steam, and the solid oxide electrolysis cell is configured to electrolyze the saturated steam supplied from the steam heater.

3. The waste incineration facility of claim 2, wherein the waste heat boiler is provided with a high-temperature heat exchanger that heats a fluid by exchanging heat between the combustion exhaust gas from the incinerator and the fluid, and the waste incineration facility is provided with an independent superheater that heats the superheated steam by exchanging heat between the superheated steam and the heated fluid, and the high-temperature heat exchanger is configured to supply the heated fluid to the solid oxide electrolysis cell.

4. The waste incineration facility of claim 3, wherein the high-temperature heat exchanger is configured to supply the heated fluid to the solid oxide electrolysis cell through the independent superheater.

5. The waste incineration facility described in claim 1, wherein the waste heat boiler is equipped with a high-temperature heat exchanger that heats the fluid by exchanging heat between the combustion exhaust gas from the incinerator and the fluid, and the waste incineration facility is equipped with: a steam heater that generates saturated steam; a saturated steam superheater that superheats the saturated steam generated by the steam heater; and an independent superheater that heats the superheated steam by exchanging heat between the superheated steam and the heated fluid, and the solid oxide electrolysis cell is configured to electrolyze the superheated saturated steam supplied from the saturated steam superheater.

6. A waste incineration facility as set forth in claim 5, wherein said high temperature heat exchanger is configured to supply said heated fluid to said saturated steam superheater.

7. The waste incineration facility of claim 6, wherein the high temperature heat exchanger is configured to supply the heated fluid to the solid oxide electrolysis cell.

8. The waste incineration facility of claim 7, wherein the high-temperature heat exchanger is configured to supply the heated fluid to the solid oxide electrolysis cell through the independent superheater.

9. The waste incineration facility according to claim 1, wherein the waste heat boiler is provided with a high-temperature heat exchanger that heats a fluid by exchanging heat between the combustion exhaust gas from the incinerator and the fluid, and the high-temperature heat exchanger is configured to supply the heated fluid to the solid oxide electrolysis cell.

10. The waste incineration facility according to claim 9, further comprising a turbine extraction steam superheater that heats steam extracted from the steam turbine generator, and the high-temperature heat exchanger is configured to supply the heated fluid to the turbine extraction steam superheater.

11. The waste incineration facility of claim 1, wherein the solid oxide electrolysis cell is configured to electrolyze the superheated steam supplied from the steam turbine generator.

12. The waste incineration facility described in claim 1, wherein the waste heat boiler is provided with a high-temperature heat exchanger that heats a fluid by exchanging heat between the combustion exhaust gas from the incinerator and the fluid, and the waste incineration facility is provided with an independent superheater that heats the superheated steam by exchanging heat between the superheated steam and the heated fluid, and the high-temperature heat exchanger is configured to supply the heated fluid to the solid oxide electrolysis cell through the independent superheater.

13. The waste incineration facility described in claim 1, wherein the waste heat boiler is equipped with a high-temperature heat exchanger that heats a fluid by exchanging heat between the combustion exhaust gas from the incinerator and the fluid, and the waste incineration facility is equipped with an independent superheater that heats the superheated steam by exchanging heat between the superheated steam and the heated fluid, and a turbine extraction steam superheater that heats steam extracted from the steam turbine generator, and the high-temperature heat exchanger is configured to supply the heated fluid to the turbine extraction steam superheater through the independent superheater.

14. The waste incineration facility of claim 13, wherein the high temperature heat exchanger is configured to supply the heated fluid to the solid oxide electrolysis cell through the independent superheater.

15. A waste incineration facility as described in claim 1, wherein the waste heat boiler is provided with a high-temperature heat exchanger that heats the fluid by exchanging heat between the combustion exhaust gas from the incinerator and the fluid, and the waste incineration facility is provided with a turbine extraction steam superheater that heats steam extracted from the steam turbine generator, and the high-temperature heat exchanger is configured to supply the heated fluid to the turbine extraction steam superheater.

16. The waste incineration facility according to claim 1, wherein the solid oxide electrolysis cell is configured to supply oxygen gas produced by the electrolysis as a combustion gas to the incinerator.

17. The waste incineration facility according to claim 16, further comprising a carbon dioxide recovery facility for recovering carbon dioxide contained in the combustion exhaust gas generated from the waste combusted with the oxygen gas.

18. A method for incinerating waste, comprising: combusting waste in an incinerator; generating superheated steam from the saturated steam in a waste heat boiler by performing heat exchange between combustion exhaust gas from the incinerator and saturated steam; supplying the superheated steam to a steam turbine generator; and electrolyzing the steam in a solid oxide electrolysis cell.

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