Discharge gas treatment method, heat treatment method, glass production method, discharge gas treatment device, heat treatment device, and glass production device

Abstract

This discharge gas treatment method brings a discharge gas containing CO2 gas into contact with aluminum-containing metal powder at 660°C or higher to reduce the CO2 gas with the aluminum, thereby yields CO gas and oxide powder including aluminum oxide.

Description

Exhaust gas treatment method, heat treatment method, glass manufacturing method, exhaust gas treatment device, heat treatment device, and glass manufacturing device

[0001] The present disclosure relates to an exhaust gas treatment method, a heat treatment method, a glass manufacturing method, an exhaust gas treatment device, a heat treatment device, and a glass manufacturing device.

[0002] The exhaust gas treatment method described in Patent Document 1 treats exhaust gas by reducing oxides in the exhaust gas with aluminum (Al). ２ By the reaction of ２ O ３ and C are produced. This reduces the amount of CO released into the atmosphere. ２ The amount of gas can be reduced.

[0003] Japanese Patent Application Publication No. 11-309335

[0004] Conventionally, CO is released into the atmosphere. ２ Technologies to reduce the amount of CO ２ The technology for reusing the gas as a carbon source for CO gas has not been considered.

[0005] The present disclosure provides ２ The present invention provides a technology for recycling the gas as a carbon source for CO gas.

[0006] An exhaust gas treatment method according to one embodiment of the present disclosure includes: ２ The exhaust gas containing CO2 is brought into contact with a metal powder containing aluminum at 660°C or higher, ２ The gas is reduced with aluminum to produce CO gas and oxide powders including aluminum oxide.

[0007] According to the present disclosure, CO ２ The gas can be reused as a C source for CO gas.

[0008] FIG. 1 is a diagram showing a glass manufacturing apparatus according to one embodiment. FIG. 2 is a diagram showing a glass manufacturing apparatus according to a first modified example. FIG. 3 is a diagram showing a glass manufacturing apparatus according to a second modified example. FIG. 4 is a diagram showing a glass manufacturing apparatus according to a third modified example. FIG. 5 is a diagram showing an example of a measurement device that measures the amount of CO gas generated depending on temperature. FIG. 6 is a diagram showing an example of the results of measuring the amount of CO gas generated depending on temperature. FIG. 7 is a diagram showing an enlarged portion of FIG. 6.

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In each drawing, the same or corresponding components are denoted by the same reference numerals, and their description may be omitted. In the specification, the symbol "to" indicating a range of values ​​means that the values ​​before and after it are included as the lower and upper limits.

[0010] A glass manufacturing apparatus 1 according to one embodiment will be described with reference to Fig. 1 . The glass manufacturing apparatus 1 includes a heat treatment device 10. The heat treatment device 10 includes, for example, a heating chamber 20, a combustor 30, a first supply line 40, an exhaust gas treatment device 50, a second supply line 60, and an input device 70. The heating chamber 20 heats an object. The combustor 30 combusts a combustible gas and a combustion-supporting gas inside the heating chamber 20. The first supply line 40 supplies exhaust gas discharged from the heating chamber 20 to the exhaust gas treatment device 50 from the heating chamber 20. The exhaust gas treatment device 50 includes a reactor 51. The reactor 51 is configured to convert CO ２ The exhaust gas containing CO2 is brought into contact with a metal powder containing aluminum at 660°C or higher, ２ The gas is reduced with aluminum to produce CO gas and oxide powder containing aluminum oxide. The second supply line 60 supplies the CO gas produced in the reactor 51 as a combustible gas to the combustor 30. The charger 70 charges the oxide powder produced in the reactor 51 as a target into the heating chamber 20. In this embodiment, the target is a glass raw material, but is not limited to glass raw material and may be, for example, a cement raw material. In other words, the technology of the present disclosure is applicable not only to the glass manufacturing apparatus 1 but also to a cement manufacturing apparatus.

[0011] First, the exhaust gas treatment device 50 will be described. The exhaust gas treatment device 50 has a reactor 51. The reactor 51 is a device for treating CO ２ The exhaust gas containing CO2 is brought into contact with a metal powder containing aluminum at 660°C or higher, ２ The gas is reduced with aluminum to produce CO gas and oxide powder containing aluminum oxide. The chemical reaction can be expressed by the following formula (1): (1) 2Al + 3CO ２ →Al ２ O ３ As will be described in detail later, the above chemical reaction is likely to proceed if the temperature of the reactor 51 is equal to or higher than 660°C, which is the melting point of aluminum. The above chemical reaction is an exothermic reaction. It is possible to use the heat released by the exothermic reaction to proceed with the above chemical reaction.

[0012] From the viewpoint of the reaction rate of the above-mentioned chemical reaction, the temperature of the reactor 51 is preferably 800° C. or higher, more preferably 900° C. or higher, and even more preferably 1000° C. or higher. From the viewpoint of the heat resistance of the reactor 51, the temperature of the reactor 51 is preferably 1600° C. or lower.

[0013] The temperature of the exhaust gas immediately before being supplied to the reactor 51 is preferably 660°C or higher, more preferably 1000°C or higher, and even more preferably 1200°C or higher. However, as described above, since the chemical reaction occurring in the reactor 51 is an exothermic reaction, the temperature of the exhaust gas may be about 200°C immediately before being supplied to the reactor 51. From the viewpoint of the heat resistance of the reactor 51, the temperature of the exhaust gas is preferably 1600°C or lower, more preferably 1500°C or lower, and even more preferably 1300°C or lower.

[0014] The reactor 51 is a CO ２ The gas is reduced with aluminum to produce CO gas. ２ The CO gas generated in the reactor 51 can be reused as a carbon source for CO gas. Since the CO gas generated in the reactor 51 is a combustible gas, it can be used as fuel for the combustor 30. This can reduce the amount of CO released into the atmosphere. ２The amount of CO gas can be reduced. The generated CO gas can be sold as a commodity without being used in the heat treatment device 10.

[0015] The reactor 51 also converts aluminum into CO ２ By oxidizing with gas, oxide powder containing aluminum oxide is produced. The oxide powder produced in the reactor 51 can be used as a glass raw material. It is also possible to use it as a cement raw material instead of a glass raw material. The produced oxide powder can also be sold as a product without being used in the heat treatment device 10.

[0016] The exhaust gas supplied to the reactor 51 is NO Ｘ Gas and SO Ｘ The gas may include at least one of NO Ｘ may be any nitrogen oxide, for example, NO, NO ２ , NO ３ , N ２ O, N ２ O ３ , N ２ O ４ , N ２ O ５ Any of the above is acceptable. Ｘ may be any sulfur oxide, for example, SO, SO ２ , S.O. ３ Any of the following is acceptable.

[0017] The reactor 51 is a reactor for removing NO contained in the exhaust gas. Ｘ Gas and SO Ｘ At least one of the gases is reduced with aluminum to produce N ２ At least one of NO gas and S gas, and oxide powder containing aluminum oxide may be produced. Ｘ Gas or SO Ｘ The amount of gas can be reduced. The generated oxide powder can be used as a glass raw material. It can also be used as a cement raw material instead of a glass raw material.

[0018] The exhaust gas supplied to the reactor 51 is H ２ The reactor 51 may contain H O gas. ２By reducing O gas with aluminum, H ２ The H produced in the reactor 51 may be a gas and an oxide powder containing aluminum oxide. ２ Since the gas is flammable, it can be used as fuel for the combustor 30. In addition, when a dehydration tank is provided in the second supply line 60 as described later, the H ２ By controlling the reduction ratio of O gas, the generated CO gas and H ２ When gas is used as fuel for the combustor 30, H ２ The O gas concentration can be adjusted, and deterioration of glass quality due to changes in the water concentration in the molten glass can be prevented. Furthermore, the generated oxide powder can be used as a glass raw material. It can also be used as a cement raw material instead of a glass raw material.

[0019] The metal powder may contain aluminum, and may contain pure aluminum or an aluminum alloy. However, from the viewpoint of controlling the composition of the oxide powder, the metal powder preferably contains pure aluminum. By using pure aluminum, it is possible to obtain an oxide powder that is substantially free of metals other than aluminum.

[0020] The metal powder may contain at least one metal selected from silicon, magnesium, calcium, zirconium, sodium, potassium, cerium, titanium, lithium, and strontium in addition to or instead of aluminum. ２ Gas and NO Ｘ Gas and SO Ｘ These metal oxides can be used as glass raw materials or cement raw materials.

[0021] The exhaust gas treatment device 50 may have at least one of a first recovery device 52 and a second recovery device 53. The first recovery device 52 recovers N ２At least one of the S gas and the S gas is recovered from the second recovery device 53. The second recovery device 53 recovers oxide powder from the products obtained in the reactor 51. The second recovery device 53 preferably supplies the recovered oxide powder to the feeder 70. The remaining products not recovered in the first recovery device 52 and the second recovery device 53 may be sent to the combustor 30. Although the first recovery device 52 and the second recovery device 53 are provided separately in FIG. 1, they may be integrated and provided as a single device.

[0022] Next, a description will be given of the components of the heat treatment device 10 other than the exhaust gas treatment device 50. The exhaust gas treatment device 50 may be used for purposes other than the heat treatment device 10, or may be used alone.

[0023] The heating chamber 20 is formed, for example, inside a heat treatment furnace. The heat treatment furnace is, for example, a glass melting furnace. The glass melting furnace contains glass raw materials and molten glass obtained by melting the glass raw materials. After being removed from the glass melting furnace, the molten glass is formed into a desired shape and slowly cooled. In this way, a glass product is obtained.

[0024] The glass frit is prepared by mixing a plurality of materials. The glass frit may contain a fining agent. The glass frit may contain glass cullet in order to recycle the glass. The glass frit may be a powder raw material or a granulated raw material obtained by granulating the powder raw material. The glass frit is determined depending on the composition of the glass product.

[0025] The glass melting furnace is made of refractory bricks. Examples of the refractory bricks include electroformed zirconia bricks, electroformed alumina bricks, electroformed alumina-zirconia bricks, electroformed AZS (Al-Zr-Si) bricks, and dense-fired bricks. The glass melting furnace may be made of multiple types of refractory bricks.

[0026] The combustor 30 burns a combustible gas and a combustion-supporting gas inside the heating chamber 20. The combustion heat can heat an object. The combustor 30 has, for example, a burner. The burner burns the combustible gas and the combustion-supporting gas to form a flame. The flame heats the object. If the object is glass frit, the glass frit gradually melts into the molten glass. Although only one burner is shown in FIG. 1, there are usually multiple burners.

[0027] The heat treatment device 10 may also use a plurality of electrodes (not shown) as a heat source. The plurality of electrodes apply an AC voltage to the molten glass, thereby electrically heating the molten glass. In this case, the molten glass generates heat. The heat treatment device 10 may also use an electric heater (not shown) as a heat source. The electric heater generates heat itself. The heat treatment device 10 is only required to include at least a combustor 30 as a heat source.

[0028] The combustor 30 burns a combustible gas and a combustion-supporting gas. In this embodiment, CO gas is used as at least a part of the combustible gas. In addition to CO gas, H ２ Natural gas may also be used as a combustible gas. ４ The amount of natural gas used is preferably 0 to 50% by volume, more preferably 0 to 25% by volume, and even more preferably 0% by volume.

[0029] The combustion-supporting gas is oxygen gas (O ２ The combustion-supporting gas may contain either pure oxygen gas or air. The combustion-supporting gas may be oxygen-enriched air. Oxygen-enriched air is a mixed gas of pure oxygen gas and air, and has a higher oxygen gas concentration than air.

[0030] When air is used as the combustion support gas, N, which accounts for the majority of the air, ２ Since gas does not contribute to combustion, a large amount of air is used and a large amount of exhaust gas is discharged from the glass melting furnace. In order to recover the heat of the large amount of exhaust gas discharged, a heat regenerator may be provided next to the heating chamber 20.

[0031] On the other hand, if pure oxygen gas is used as the combustion supporting gas, the combustion supporting gas becomes N２ Therefore, the amount of exhaust gas discharged is small and a heat regenerator is not required, which increases the degree of freedom in the design of the heat treatment furnace. ２ This eliminates the need to heat gas unnecessarily, and the object can be heated efficiently using the heat of combustion. Ｘ Gas generation can be suppressed.

[0032] The first supply line 40 supplies the exhaust gas discharged from the heating chamber 20 from the heating chamber 20 to the exhaust gas treatment device 50. The first supply line 40 preferably sends the exhaust gas while maintaining the temperature of the exhaust gas at 1000°C or higher in order to suppress a decrease in the reaction rate in the reactor 51. A discharge line for discharging excess exhaust gas may be provided midway along the first supply line 40. By supplying the exhaust gas from the heating chamber 20 to the exhaust gas treatment device 50, it is possible to reuse heat that would have been discarded outside the system as excess exhaust gas, and it is possible to eliminate the need for a new heat source, thereby saving space and increasing the degree of freedom in designing the equipment.

[0033] The second supply line 60 supplies the CO gas generated in the reactor 51 as a combustible gas to the combustor 30. The second supply line 60 supplies the H ２ The gas may be supplied as a combustible gas to the combustor 30. A first recovery unit 52 may be provided midway along the second supply line 60.

[0034] A dehydration tank (not shown) may be provided in the middle of the second supply line 60. ２ Remove O gas. ２ By removing O gas, H gas that does not contribute to combustion is removed. ２ The O gas is not heated unnecessarily, and the object can be efficiently heated by the combustion heat. ２ The O gas concentration can be reduced.

[0035] H in the heating chamber 20 ２ Reducing the O gas concentration is effective in producing glass. ２ If the O gas concentration is too high, NaOH gas derived from Na contained in the glass raw material is likely to be generated, and furnace materials such as bricks are likely to corrode.２ If the O gas concentration is too high, the water concentration in the molten glass will be too high, resulting in a low quality glass.

[0036] The charger 70 charges the oxide powder produced in the reactor 51 into the heating chamber 20 as the target. The oxide powder contains aluminum oxide. The oxide powder can be used as a glass raw material. Note that the oxide powder can also be used as a cement raw material instead of a glass raw material.

[0037] Next, a glass manufacturing apparatus 1 according to a first modified example will be described with reference to FIG. 2 . Differences from the above embodiment will be mainly described below. As shown in FIG. 2 , the heat treatment apparatus 10 may include a first heat exchanger 41 in the first supply line 40. The first heat exchanger 41 transfers heat from the exhaust gas to the combustion-sustaining gas without mixing the exhaust gas and the combustion-sustaining gas, and heats the combustion-sustaining gas with the heat of the exhaust gas. The heated combustion-sustaining gas is sent to the combustor 30. The combustion-sustaining gas can be preheated before the combustion reaction.

[0038] Next, a glass manufacturing apparatus 1 according to a second modification will be described with reference to FIG. 3 . Differences from the above embodiment will be mainly described below. As shown in FIG. 3 , the heat treatment apparatus 10 may include a second heat exchanger 61 in the second supply line 60. The second heat exchanger 61 transfers heat from the CO gas generated in the reactor 51 to the combustion-sustaining gas without mixing the CO gas and the combustion-sustaining gas, and heats the combustion-sustaining gas with the heat of the CO gas. Because the reaction that generates CO gas is an exothermic reaction, the temperature of the CO gas is sufficiently high, making it possible to sufficiently heat the combustion-sustaining gas. The heated combustion-sustaining gas is sent to the combustor 30. The combustion-sustaining gas can be preheated before the combustion reaction. The second heat exchanger 61 can also be used in combination with the first heat exchanger 41 shown in FIG. 2.

[0039] Next, a glass manufacturing apparatus 1 according to a third modified example will be described with reference to FIG. 4 . Differences from the above embodiment will be mainly described below. As shown in FIG. 4 , the heat treatment apparatus 10 may include a first combustor 30A, a second combustor 30B, a first heat regenerator 90A, and a second heat regenerator 90B. While the number of first heat regenerators 90A is one in FIG. 4 , there may be more than one. Similarly, the number of second heat regenerators 90B, the number of first combustors 30A, and the number of second combustors 30B may also be one or more.

[0040] In the glass manufacturing apparatus 1, the first combustor 30A forms a flame in the heating chamber 20, and the second combustor 30B forms a flame in the heating chamber 20, alternately and repeatedly. While one of the first combustor 30A and the second combustor 30B forms a flame in the heating chamber 20, the other does not need to form a flame in the heating chamber 20. FIG. 4 shows a state in which the first combustor 30A forms a flame in the heating chamber 20.

[0041] While the first combustor 30A forms a flame in the heating chamber 20, the second heat storage chamber 90B stores heat from the exhaust gas discharged from the heating chamber 20, and the first heat storage chamber 90A releases the heat stored in advance to heat the combustible gas. The first combustor 30A forms a flame in the heating chamber 20 by combusting the combustible gas preheated in the first heat storage chamber 90A and the combustion-supporting gas.

[0042] While the second combustor 30B forms a flame in the heating chamber 20, the first heat storage chamber 90A stores heat from the exhaust gas discharged from the heating chamber 20, and the second heat storage chamber 90B releases the heat stored in advance to heat the combustible gas. The second combustor 30B forms a flame in the heating chamber 20 by combusting the combustible gas preheated in the second heat storage chamber 90B and the combustion-supporting gas.

[0043] The first heat regenerator 90A and the second heat regenerator 90B are into which exhaust gas flows. Heat of the exhaust gas is accumulated in the hearths of the first heat regenerator 90A and the second heat regenerator 90B. The first heat regenerator 90A and the second heat regenerator 90B can be used in combination with at least one of the first heat exchanger 41 shown in FIG. 2 and the second heat exchanger 61 shown in FIG. 3.

[0044] The first heat exchanger 41 shown in FIG. 2 is provided, for example, on the first supply line 40 shown in FIG. 4 downstream of the second heat storage chamber 90B (on the side closer to the reactor 51).

[0045] The second heat exchanger 61 shown in Fig. 3 is provided, for example, on the upstream side (closer to the reactor 51) of the first heat storage chamber 90A in the second supply line 60 shown in Fig. 4. After transferring excess heat from the CO gas to the combustion-supporting gas, the CO gas can be heated in the first heat storage chamber 90A. The combustible gas and the combustion-supporting gas can be heated efficiently.

[0046] The experimental data will be explained below. First, the amount of CO gas generated as a function of temperature was measured using a measuring device 100 shown in FIG. 5. The measuring device 100 was equipped with a gas cylinder 110, an atmospheric furnace 120, a supply line 130, an exhaust line 140, and a gas analyzer 150. The gas cylinder 110 was used to measure the amount of CO gas generated as a function of temperature. ２ The atmosphere furnace 120 contained a gas. The test specimen was made of pure Al powder. ２ O ３ The sample was placed in a heat-resistant container made of aluminum and placed inside the atmosphere furnace 120. The temperature inside the atmosphere furnace 120 was increased from room temperature to 1200°C at a rate of 240°C / hr. CO was supplied through the supply line 130 at a flow rate of 0.5 L / min. ２ Gas was supplied from a gas cylinder 110 to the atmosphere furnace 120. An exhaust line 140 exhausted the gas from the inside to the outside of the atmosphere furnace 120 by pressure difference. A gas analyzer 150 analyzed the composition of the gas in the middle of the exhaust line 140.

[0047] FIG. 6 shows an example of the results of measuring the amount of CO gas generated as a function of temperature. FIG. 7 shows an enlarged view of a portion of FIG. 6 . In FIGS. 6 and 7 , the horizontal axis indicates the temperature inside the atmospheric furnace 120, and the vertical axis indicates the percentage (volume %) of CO gas in the gas flowing through the exhaust line 140. As shown in FIG. 7 , CO gas was generated when the temperature inside the atmospheric furnace 120 reached 470°C or higher. Furthermore, when the temperature inside the atmospheric furnace 120 reached the melting point of pure Al (660°C) or higher, a large amount of CO gas was generated. It is believed that the melting of pure Al promotes the generation of CO gas. It is believed that when the temperature inside the atmospheric furnace 120 reached 700°C or higher, the generation of CO gas was further promoted by an exothermic reaction.

[0048] Table 1 shows the percentage of Al in the test specimens according to the temperature. ２ O ３ The experiment in Table 1 was carried out under the same conditions (CO ２ The test was carried out under the conditions of gas flow rate and temperature rise rate. ２ O ３ The proportion (mass %) of Al was measured using an X-ray diffractometer (XRD). The measurement data (X-ray diffraction pattern) was analyzed using Rietveld analysis. As shown in Table 1, when the temperature inside the atmosphere furnace 120 reached the melting point of pure Al (660°C) or higher, the Al ２ O ３ The generation of was confirmed.

[0049]

[0050] The following supplementary notes are provided regarding the above-described embodiments. [Supplementary Note 1] CO ２ The exhaust gas containing CO2 is brought into contact with a metal powder containing aluminum at 660°C or higher, ２ A method for treating an exhaust gas, comprising reducing a gas with aluminum to produce CO gas and an oxide powder containing aluminum oxide. Ｘ Gas and SO Ｘ gas, and Ｘ Gas and SO Ｘ At least one of the gases is reduced with aluminum to produce N ２[Supplementary Note 3] A heat treatment method using the exhaust gas treatment method according to Supplementary Note 1 or 2, comprising: heating an object in a heating chamber; burning a combustible gas and a combustion-supporting gas in a combustor inside the heating chamber; supplying the exhaust gas discharged from the heating chamber to a reactor in which the exhaust gas and the metal powder are reacted; and generating an oxide powder containing at least one of a carbon dioxide gas and a sulfur dioxide gas and an aluminum oxide in the reactor. ２ a heat treatment method comprising reducing a gas with aluminum to generate CO gas and an oxide powder containing aluminum oxide, and supplying the CO gas generated in the reactor to the combustor as the combustible gas. [Appendix 4] The heat treatment method according to Appendix 3, wherein the oxide powder generated in the reactor is introduced into the heating chamber as the target object. [Appendix 5] The heat treatment method according to Appendix 3 or 4, wherein a first heat exchanger is disposed in a first supply line that supplies the exhaust gas from the heating chamber to the reactor, and heats the combustion-supporting gas with heat of the exhaust gas. [Appendix 6] The heat treatment method according to any one of Appendixes 3 to 5, wherein a second heat exchanger is disposed in a second supply line that supplies the CO gas generated in the reactor as the combustible gas from the reactor to the combustor. [Supplementary Note 7] The heat treatment method according to any one of Supplementary Notes 3 to 6, wherein a first heat storage chamber stores heat of the exhaust gas in a first supply line that supplies the exhaust gas from the heating chamber to the reactor, and releases the previously stored heat to heat the combustible gas. [Supplementary Note 8] A heat treatment method using the exhaust gas treatment method according to Supplementary Note 1 or 2, comprising: heating an object in a heating chamber; supplying the exhaust gas discharged from the heating chamber to a reactor in which the exhaust gas and the metal powder are reacted; ２A heat treatment method comprising reducing a gas with aluminum to generate CO gas and an oxide powder containing aluminum oxide, and charging the oxide powder generated in the reactor into the heating chamber as the object. [Appendix 9] A glass manufacturing method, comprising heating the object by the heat treatment method according to any one of Appendices 3 to 8, and the object being a glass raw material. [Appendix 10] The glass manufacturing method according to Appendices 9, wherein the temperature of the exhaust gas immediately before being supplied to the reactor is 660°C to 1600°C. [Appendix 11] CO ２ The exhaust gas containing CO2 is brought into contact with a metal powder containing aluminum at 660°C or higher, ２ An exhaust gas treatment device comprising a reactor for reducing a gas with aluminum to produce CO gas and oxide powder containing aluminum oxide. Ｘ Gas and SO Ｘ and the reactor contains at least one of the following gases: NO Ｘ Gas and SO Ｘ At least one of the gases is reduced with aluminum to produce N ２an oxide powder containing at least one of a carbon dioxide gas and an S gas and aluminum oxide; [Appendix 13] A heat treatment device including the exhaust gas treatment device of Appendix 11 or 12, comprising: a heating chamber for heating an object; a combustor for combusting a combustible gas and a combustion-supporting gas inside the heating chamber; a first supply line for supplying the exhaust gas from the heating chamber to the reactor; and a second supply line for supplying CO gas generated in the reactor to the combustor as the combustible gas. [Appendix 14] The heat treatment device of Appendix 13, including an input device for inputting the oxide powder generated in the reactor into the heating chamber as the object. [Appendix 15] The heat treatment device of Appendix 13 or 14, comprising a first heat exchanger located midway through the first supply line, and the first heat exchanger heats the combustion-supporting gas with heat from the exhaust gas. [Appendix 16] The heat treatment device according to any one of Appendices 13 to 15, further comprising a second heat exchanger provided in the second supply line, the second heat exchanger heating the combustion-supporting gas with heat from the CO gas. [Appendix 17] The heat treatment device according to any one of Appendices 13 to 16, further comprising a first heat accumulator provided in the first supply line, the first heat accumulator storing heat from the exhaust gas and releasing the previously stored heat to heat the combustible gas. [Appendix 18] A heat treatment device comprising the exhaust gas treatment device according to Appendices 11 or 12, the heat treatment device comprising: a heating chamber for heating an object; a first supply line for supplying the exhaust gas from the heating chamber to the reactor; and a feeder for feeding oxide powder produced in the reactor into the heating chamber as the object. [Appendix 19] A glass manufacturing apparatus comprising the heat treatment device according to any one of Appendices 13 to 18, the object being a glass raw material. [Supplementary Note 20] The glass manufacturing apparatus according to Supplementary Note 19, wherein the temperature of the exhaust gas immediately before being supplied to the reactor is 660°C to 1600°C.

[0051] The exhaust gas treatment method, heat treatment method, glass manufacturing method, exhaust gas treatment device, heat treatment device, and glass manufacturing device according to the present disclosure have been described above, but the present disclosure is not limited to the above-described embodiments, etc. Various changes, modifications, substitutions, additions, deletions, and combinations are possible within the scope of the claims. These naturally fall within the technical scope of the present disclosure.

[0052] This application claims priority based on Japanese Patent Application No. 2023-203007 filed with the Japan Patent Office on November 30, 2023, the entire contents of which are incorporated herein by reference.

[0053] REFERENCE SIGNS LIST 1 Glass manufacturing apparatus 10 Heat treatment device 20 Heating chamber 30 Combustor 40 First supply line 50 Exhaust gas treatment device 51 Reactor 60 Second supply line

Claims

1. CO ２ The exhaust gas containing CO2 gas is contacted with a metal powder containing aluminum at 660°C or higher to produce a CO ２ A method for treating exhaust gas, comprising reducing a gas with aluminum to produce CO gas and an oxide powder including aluminum oxide.

2. The exhaust gas is NO Ｘ Gas and SO Ｘ At least one of the gases NO Ｘ Gas and SO Ｘ At least one of the gases is reduced with aluminum to produce N ２ The exhaust gas treatment method according to claim 1 , further comprising producing at least one of a sulfur gas and an S gas, and an oxide powder containing aluminum oxide.

3. A heat treatment method using the exhaust gas treatment method according to claim 1, comprising: heating an object in a heating chamber; a combustor combusting a combustible gas and a combustion-supporting gas inside the heating chamber; supplying the exhaust gas discharged from the heating chamber to a reactor in which the exhaust gas reacts with the metal powder; and reacting the exhaust gas with the metal powder in the reactor. ２ A heat treatment method comprising: reducing a gas with aluminum to generate CO gas and an oxide powder containing aluminum oxide; and supplying the CO gas generated in the reactor to the combustor as the combustible gas.

4. The heat treatment method according to claim 3, wherein the oxide powder produced in the reactor is charged into the heating chamber as the target object.

5. The heat treatment method according to claim 3, wherein a first heat exchanger heats the combustion supporting gas with heat of the exhaust gas in a first supply line that supplies the exhaust gas from the heating chamber to the reactor.

6. The heat treatment method according to claim 3, wherein a second heat exchanger heats the combustion supporting gas with heat from the CO gas generated in the reactor midway along a second supply line that supplies the CO gas generated in the reactor as the combustible gas from the reactor to the combustor.

7. A heat treatment method as described in claim 3, wherein a first heat storage chamber stores heat of the exhaust gas midway along a first supply line that supplies the exhaust gas from the heating chamber to the reactor, and releases the previously stored heat to heat the combustible gas.

8. A heat treatment method using the exhaust gas treatment method according to claim 1, comprising: heating an object in a heating chamber; supplying the exhaust gas discharged from the heating chamber to a reactor in which the exhaust gas and the metal powder are reacted; and ２ A heat treatment method comprising the steps of: reducing a gas with aluminum to generate CO gas and an oxide powder containing aluminum oxide; and introducing the oxide powder generated in the reactor into the heating chamber as the target object.

9. A method for manufacturing glass, comprising heating the object by the heat treatment method according to any one of claims 3 to 8, wherein the object is a glass raw material.

10. The method for producing glass according to claim 9, wherein the temperature of the exhaust gas immediately before being supplied to the reactor is 660°C to 1600°C.

11. CO ２ The exhaust gas containing CO2 gas is contacted with a metal powder containing aluminum at 660°C or higher to produce a CO ２ An exhaust gas treatment device comprising a reactor for reducing a gas with aluminum to produce CO gas and an oxide powder containing aluminum oxide.

12. The exhaust gas is NO Ｘ Gas and SO Ｘ The reactor contains at least one of the following gases: NO Ｘ Gas and SO Ｘ At least one of the gases is reduced with aluminum to produce N ２ The exhaust gas treatment device according to claim 11, which produces at least one of a gas and an S gas, and an oxide powder containing aluminum oxide.

13. A heat treatment device comprising the exhaust gas treatment device according to claim 11, comprising: a heating chamber for heating an object; a combustor for combusting a combustible gas and a combustion-supporting gas inside the heating chamber; a first supply line for supplying the exhaust gas from the heating chamber to the reactor; and a second supply line for supplying CO gas generated in the reactor to the combustor as the combustible gas.

14. The heat treatment apparatus according to claim 13, further comprising an introduction device for introducing the oxide powder produced in the reactor into the heating chamber as the target object.

15. The heat treatment device according to claim 13, further comprising a first heat exchanger provided in the first supply line, the first heat exchanger heating the combustion supporting gas with heat from the exhaust gas.

16. The heat treatment apparatus according to claim 13, further comprising a second heat exchanger provided in the second supply line, the second heat exchanger heating the combustion supporting gas with heat from the CO gas.

17. The heat treatment device according to claim 13, further comprising a first heat storage chamber provided in the first supply line, the first heat storage chamber storing heat from the exhaust gas and releasing the previously stored heat to heat the combustible gas.

18. A heat treatment apparatus comprising the exhaust gas treatment device according to claim 11, comprising: a heating chamber for heating an object; a first supply line for supplying the exhaust gas from the heating chamber to the reactor; and an input device for inputting the oxide powder produced in the reactor into the heating chamber as the object.

19. A glass manufacturing apparatus comprising the heat treatment apparatus according to any one of claims 13 to 18, wherein the object is a glass raw material.

20. The glass manufacturing apparatus according to claim 19, wherein the temperature of the exhaust gas immediately before being supplied to the reactor is 660°C to 1600°C.

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