Thermal electric power generation method

Abstract

To provide a thermal electric power generation method which suppresses an emission amount of carbon oxide, such as carbon dioxide, emitted from a thermal electric power plant and having impact on warming.SOLUTION: A thermal electric power generation method mixedly burns a fuel containing carbon, and an inorganic solid fuel not containing carbon in a combustion chamber 21 of an electric power generation boiler 2. The inorganic solid fuel is composed of one or more kinds of materials selected from magnesium, lithium, aluminum, and hydride in which at least a part of magnesium, lithium, aluminum is hydrogenated.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a thermal power generation method. [Background technology]

[0002] Currently, the main source of electricity generation in Japan is thermal power generation (see Non-Patent Document 1).

[0003] However, in order to achieve carbon neutrality by 2050, it is becoming increasingly urgent to reduce carbon dioxide emissions from thermal power plants. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] “Promoting regional environmental conservation: The structure of coal-fired power plants and various environmental conservation measures”, [online], Okinawa Electric Power Co., Inc., [Retrieved June 30, 2022], Internet<URL:https: / / www.okiden.co.jp / environment / report2017 / sec6 / sec63.html> Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made in consideration of the above circumstances, and aims to provide a thermal power generation method that suppresses emissions of carbon dioxide, which has an impact on global warming and is emitted from thermal power plants. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention is realized by the following configuration. (1) The present invention is a thermal power generation method in which a fuel containing carbon and an inorganic solid fuel not containing carbon are mixed and burned in a combustion chamber of a power generation boiler, wherein the inorganic solid fuel is made of one or more materials selected from magnesium, lithium, aluminum, and hydrides in which at least a portion of magnesium, lithium, and aluminum are hydrogenated.

[0007] (2) In the above configuration (1), the inorganic solid fuel is made of one or more materials selected from magnesium and hydrides in which at least a portion of magnesium is hydrogenated.

[0008] (3) In the above configuration (1), the carbon-containing fuel is a solid fuel mainly composed of carbon.

[0009] (4) In the configuration of (3) above, the solid fuel is in powder form, the solid fuel is burned using a powder combustion burner provided in the combustion chamber, and the inorganic solid fuel is supplied into a flame formed by the powder combustion burner.

[0010] (5) In the above configuration (1), the carbon-containing fuel is a hydrocarbon fuel that is liquid or gaseous at room temperature and pressure.

[0011] (6) In the above configuration (5), the hydrocarbon fuel is combusted using a combustion burner provided in the combustion chamber, and the inorganic solid fuel is supplied into the flame of the combustion burner. Effect of the Invention

[0012] According to the present invention, it is possible to provide a thermal power generation method that suppresses the emission of carbon dioxide, which has an impact on global warming and is emitted from thermal power plants. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram for explaining the configuration of a power plant for explaining a thermal power generation method according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, modes for carrying out the present invention (hereinafter, referred to as embodiments) will be described in detail with reference to the accompanying drawings. In addition, the same elements are denoted by the same reference numerals throughout the description of the embodiments.

[0015] (Embodiment) FIG. 1 is a diagram for explaining the configuration of a power plant for explaining a thermal power generation method according to an embodiment of the present invention.

[0016] A power plant for carrying out the thermal power generation method of this embodiment includes a generator 1, a power generation boiler 2 that drives the generator 1, a fuel storage tank 3 that stores fuel containing carbon to be supplied to the power generation boiler 2, a fuel storage tank 4 that stores inorganic solid fuel containing no carbon to be supplied to the power generation boiler 2, and an auxiliary fuel storage tank 5 that stores auxiliary fuel to be supplied to the power generation boiler 2.

[0017] In addition, a power plant for implementing the thermal power generation method of this embodiment includes a denitrification device 6 that renders nitrogen oxides (NOx) contained in exhaust gas harmless, a dust collector 7 that collects combustion ash contained in the exhaust gas that has passed through the denitrification device 6, and a sulfur dioxide (SO 2 and a desulfurization device 8 for removing sulfur dioxide.

[0018] The power generating boiler 2 comprises a combustion chamber 21, a steam turbine 22 whose rotating shaft is connected to the generator 1 and which is driven by steam produced in the combustion chamber 21, and piping 23 for supplying the steam to the steam turbine 22 and for supplying water that has been returned to a liquid state in the condenser FU back to the combustion chamber 21.

[0019] A water supply pump P is provided in the middle of the pipe 23 connecting the condenser FU and the combustion chamber 21, so as to send water to the combustion chamber 21 side.

[0020] Furthermore, the power plant for carrying out the thermal power generation method of this embodiment is provided with a combustion ash storage 9 for storing the combustion ash accumulated in the combustion chamber 21 and the combustion ash collected by the dust collector 7.

[0021] The configuration of the power plant shown in FIG. 1 is similar overall to a power plant that uses pulverized coal burners to burn coal in a combustion chamber, so the following mainly describes the differences, and may omit a description of the similarities with thermal power plants that generate electricity using general pulverized coal burners.

[0022] In addition, in the description of this embodiment, the case will be described where the fuel containing carbon is coal, which is a solid fuel mainly composed of carbon.

[0023] The combustion chamber 21 is equipped with a powder combustion burner 31 that burns coal powder supplied from the fuel storage tank 3, and an auxiliary combustion burner 51 that burns liquid fuel (e.g., heavy oil, light oil, etc.) supplied from the auxiliary fuel storage tank 5.

[0024] The powder combustion burner 31 is similar to the pulverized coal burner used in coal-fired power generation, and as in a typical coal-fired power plant, a coal pulverizer C is installed just before the coal is sent to the powder combustion burner 31.

[0025] The coal is then pulverized in a coal pulverizer C to produce pulverized coal having a particle diameter of 150 μm or less, and the pulverized coal is supplied to a powder combustion burner 31 .

[0026] The supply mechanism for supplying the pulverized coal to the powder combustion burner 31 may be the same as that used in coal-fired power generation, for example, a pressure feed system.

[0027] In addition, the inorganic solid fuel stored in the fuel storage tank 4, which will be explained later, is in powder form similar to pulverized coal, and is supplied so as to join the line that supplies pulverized coal from the fuel storage tank 4 to the powder combustion burner 31. Therefore, in the combustion chamber 21, the fuel containing carbon and the inorganic solid fuel not containing carbon are mixed and burned.

[0028] The auxiliary combustion burner 51 is a burner for obtaining auxiliary heat until the temperature in the combustion chamber 21 rises and the combustion in the powder combustion burner 31 becomes stable, and this may be similar to that used in coal-fired power generation.

[0029] Once the combustion in the powder combustion burner 31 becomes stable, this auxiliary heating power is no longer necessary. And because thermal power plants are basically operated without being shut down, the amount of carbon dioxide emitted by auxiliary thermal power plants, which are only used at the start of operations, is negligible.

[0030] The inorganic solid fuel stored in the fuel storage 4 is, for example, magnesium hydride (MgH), which is a powder fuel that does not emit carbon dioxide when burned and has a particle diameter of 150 μm or less and at least a hydrogenated layer on its surface. 2 ).

[0031] Since magnesium hydride is not perfectly spherical, a particle size of 150 μm or less here can be considered to be a size that can pass through a sieve with a mesh opening of about 0.16 mm.

[0032] The inorganic solid fuel does not have to be limited to magnesium hydride, but may be composed of one or more materials selected from magnesium (Mg), lithium (Li), aluminum (Al), and hydrides in which at least a portion of magnesium, lithium, and aluminum are hydrogenated. These materials can be combusted well as an inorganic solid fuel. However, from the viewpoint of good combustion characteristics, it is preferable to use magnesium, magnesium hydride, or a mixture thereof as the inorganic solid fuel.

[0033] In addition, magnesium, lithium, and aluminum are easily flammable when they are reduced to fine powder, so if the particle size is to be 150 μm or less as described above, it is advisable to provide at least a hydrogenated layer on the surface to suppress flammability.

[0034] Since pulverized coal and magnesium hydride are supplied to the powder combustion burner 31, the magnesium hydride is supplied into the stable combustion flame of the pulverized coal, promoting stable combustion of the magnesium hydride.

[0035] In this embodiment, the carbon-containing fuel is coal. However, the powder combustion burner 31 may be replaced with a combustion burner that burns liquid fuel, and the carbon-containing fuel may be a fuel that is liquid at room temperature and pressure, for example, a petroleum-based fuel such as heavy oil or light oil (a hydrocarbon-based fuel that is liquid at room temperature and pressure).

[0036] In addition, instead of the powder combustion burner 31 being a combustion burner that burns gas, a carbon-containing fuel such as liquefied natural gas (a hydrocarbon fuel that is gaseous at room temperature and pressure) may be used, which is a gas at room temperature and pressure.

[0037] In this way, when changing the type of burner and using liquid fuel or gas as the carbon-containing fuel, a separate powder sprayer that sprays powder toward the flame formed by the burner can be provided, and the inorganic solid fuel can be sprayed toward the flame using the powder sprayer.

[0038] By the way, when magnesium hydride or magnesium is burned in an oxygen-deficient state, it reacts with nitrogen in the air to form magnesium nitride (Mg 3 N 2 ) is generated.

[0039] Therefore, if any magnesium hydride is incompletely combusted, it may be converted into magnesium nitride and mixed into the combustion ash.

[0040] When magnesium nitride is exposed to moisture, it quickly reacts with the moisture to produce magnesium hydroxide (Mg(OH) 2 ) and ammonia (NH 3 ) Mg 3 N 2+ 6H 2 O → 3Mg(OH) 2 + 2NH 3 ... (1)

[0041] Therefore, if magnesium nitride is present in the combustion ash, there is a possibility that ammonia will be generated from the combustion ash after the combustion ash is collected.

[0042] Therefore, it is preferable to increase the humidity inside the combustion chamber 21 so that even if magnesium nitride is produced, it can be decomposed quickly. In this way, even if magnesium nitride is produced, it is quickly decomposed, and the ammonia generated by the decomposition can also contribute to combustion as a combustion gas.

[0043] As a method for increasing the humidity inside the combustion chamber 21, for example, an intake port may be provided to send humid air (e.g., air with a humidity of 50% or more, more preferably 70% or more, or even 80% or more) into the combustion chamber 21, or air with increased humidity may be sent to the powder combustion burner 31 in advance to increase the humidity in the flame; the method is not particularly limited.

[0044] Moreover, considering that moist air has a higher thermal conductivity than dry air, it is expected that the heat exchange efficiency in the pipe 23 passing through the combustion chamber 21 will also be improved.

[0045] On the other hand, since the exhaust gas discharged from the combustion chamber 21 contains nitrogen oxides (NOx), in order to render the nitrogen oxides (NOx) in the exhaust gas harmless, a denitrification device 6 is provided in the exhaust pipe 10 that sends the exhaust gas from inside the combustion chamber 21 to a dust collector 7.

[0046] Specifically, the denitration device 6 may be similar to a denitration device generally used in coal-fired power plants, which adds ammonia to the exhaust gas and passes it through a catalyst layer to break down nitrogen oxides (NOx) into harmless nitrogen and water.

[0047] Since the exhaust gas that has passed through the denitrification device 6 contains combustion ash generated during combustion that has an extremely small particle size, the exhaust pipe 10 is further connected to a dust collector 7, which collects the combustion ash.

[0048] In addition, since the exhaust gas contains sulfur dioxide, a desulfurization device 8 is provided immediately after an exhaust fan 11 provided on an exhaust pipe 10 downstream of the dust collector 7 to remove the sulfur dioxide.

[0049] In this way, the exhaust gas from which nitrogen oxides (NOx), fine combustion ash particles, and sulfur dioxide have been removed is released into the atmosphere through the chimney.

[0050] Here, for example, if a hydrogenation film is provided on the surface and the overall purity of the magnesium hydride is low, about 20 mass%, the heat generation per weight when burned will be almost equal to that of coal.

[0051] Therefore, if the amount of coal used is reduced to half of the usual amount and magnesium hydride with a purity of 20% by mass is added instead, the amount of heat generated during combustion will be the same as before the amount of coal was reduced, even though the amount of coal used has been halved.

[0052] In the case of magnesium hydride with a purity of 20% by mass, the combustion reactions that occur are the combustion reaction of the magnesium hydride part (see formula (2) below) and the combustion reaction of the magnesium part (see formula (3) below), but neither combustion reaction produces carbon dioxide. MgH 2 + O 2 → MgO + H 2 O + heat (2) 2Mg + O 2 → 2MgO + heat (3)

[0053] As a result, the same calorific value can be obtained as before the amount of coal used was reduced, and the amount of electricity generated can be maintained at the same level as before the amount of coal used was reduced. However, by adding inorganic solid fuel, which does not emit carbon dioxide when burned, the amount of coal used itself is halved, and carbon dioxide emissions can be halved compared to the amount of electricity generated.

[0054] In addition, the magnesium portion also burns in carbon dioxide as shown in the following formula (4), and decomposes the carbon dioxide into solid carbon. Therefore, the combustion ash contains carbon that is generated as a result of the decomposition of carbon dioxide but is not recombusted, which provides an effect of reducing carbon dioxide emissions that goes beyond the reduction in coal consumption. 2Mg + CO 2 → 2MgO + C + heat (4)

[0055] And, magnesium oxide (MgO), the combustion product of magnesium hydride, is a solid, so it is collected in the combustion ash storage tank 9. If the magnesium is extracted from this magnesium oxide and hydrogenated, it can be regenerated as inorganic solid fuel again.

[0056] The main component of the combustion products of magnesium hydride is magnesium oxide, but a small amount of magnesium hydroxide may be contained, which, as will be explained later, does not pose a problem.

[0057] In other words, it is possible to realize a resource-circulating thermal power generation method in which magnesium resources are circulated. Therefore, the following will briefly explain a method for extracting magnesium from magnesium oxide and recycling the resource (resource recycling process).

[0058] The resource recycling process includes an anhydrous chlorination step for producing anhydrous magnesium chloride, and a molten salt electrolysis step for producing magnesium using the anhydrous magnesium chloride.

[0059] (Anhydrous chlorination process) The anhydrous chlorination process includes an extraction process for extracting the magnesium component as magnesium chloride hydrate, and an anhydrous chloride production process for removing impurities and water from the extracted magnesium chloride hydrate. In addition, when the inorganic solid fuel is aluminum or its hydride, the extraction process includes an extraction step of extracting the aluminum component as aluminum chloride hydrate, and an anhydrous chloride production step of removing impurities and water from the extracted aluminum chloride hydrate, and the same applies to lithium and its hydride.

[0060] (extraction process) In the combustion ash storage 9, not only magnesium oxide as described above but also coal combustion ash is collected. The main components of coal ash vary slightly depending on the place of origin, but generally, in descending order, they are: SiO 2 (40-75%), Al 2 O 3 (15-35%), Fe 2 O 3 (2-10%). It also contains carbon powder produced by the decomposition of carbon dioxide as described above.

[0061] Therefore, carbon powder and SiO 2 Remove. Specifically, when combustion ash is placed in hydrochloric acid water, MgO, Al 2 O 3 , Fe 2 O 3 reacts with hydrochloric acid to become chlorides, which dissolve in the solution, but carbon powder and SiO 2 does not react with hydrochloric acid and is insoluble in the solution, so if you filter this solution, you will find carbon powder and SiO 2 can be removed.

[0062] In addition, MgO reacts quickly with hydrochloric acid to become magnesium chloride, which dissolves in the solution, but Al 2 O 3 Since the reaction rate with hydrochloric acid is slow, all of the MgO is converted to magnesium chloride (MgCl 2 ) at the time, Al2 O 3 Many of them may not have melted yet. Magnesium hydroxide (Mg(OH) 2 ) reacts quickly with hydrochloric acid to form chlorides, just like MgO, so there is no problem if it is contained in the combustion ash.

[0063] And since all we want to have dissolved in the solution is the Mg component, all of the MgO, Mg(OH) 2 But MgCl 2 After a sufficient time has passed to allow the mixture to become soluble in water, filtration may be performed to remove any solid components that are not dissolved in the solution.

[0064] Also, MgO, Mg(OH) 2 But MgCl 2 Needless to say, to facilitate this, it is advisable to slightly increase the temperature of the solution or stir it.

[0065] Next, carbon powder and SiO 2 The water in the filtrate from which the solids such as MgCl were removed was evaporated. 2 , AlCl 3 , FeCl 3 , FeCl 2 of hydrate is recovered.

[0066] As described above, the extraction process includes a filtration process in which the combustion ash is placed in hydrochloric acid and filtered, and a hydrate recovery process in which the filtrate is dried and the hydrates of the chlorides in the filtrate are recovered.

[0067] (Anhydrous chloride production process) The material obtained from the extraction process (chloride hydrate) contains a lot of water and other components besides magnesium chloride. Therefore, a process is required to remove water (dehydration) and impurities to produce highly pure anhydrous magnesium chloride.

[0068] The moisture in hydrates is contained as water of crystallization, and therefore heating is necessary to remove this water of crystallization. However, simply heating the recovered hydrates to remove moisture will cause a hydrolysis reaction, resulting in the hydrates being converted into oxides.

[0069] Therefore, in order to suppress the reaction that turns into this oxide, a dehydration treatment is carried out by blowing hydrogen chloride gas over the material and maintaining the temperature at about 400 to 550°C.

[0070] The term "blow-flowing state" means that gas is supplied into a sealed heating vessel for carrying out a reaction, and the gas is exhausted in accordance with the gas supply, creating a gas flow within the heating vessel, and constantly replacing the gas within the heating vessel. Therefore, the moisture generated by the dehydration is discharged to the outside of the heating vessel together with the exhaust gas.

[0071] And anhydrous AlCl 3 has a sublimation point of around 180°C, and anhydrous FeCl 3 Since the boiling point of is around 350°C, as the dehydration process progresses, it is discharged out of the heating vessel together with the hydrogen chloride that is blown away.

[0072] In this embodiment, the inorganic solid fuel is described as being low-purity magnesium hydride, but if the inorganic solid fuel is aluminum (Al) or its hydride, the material obtained in the extraction process will be aluminum chloride hydrate.

[0073] Therefore, in this case, if the hydrate is heated at a temperature below 180°C, which is the sublimation temperature of anhydrous aluminum chloride, while hydrogen chloride is blown over it, and the dehydration is advanced, the heating temperature is then set to about 300°C, and anhydrous AlCl 3 is discharged outside the heating vessel together with the exhaust gas, and can be collected.

[0074] In addition, anhydrous FeCl 3 The boiling point of is around 350℃, so if you heat it to about 300℃, anhydrous FeCl 3can be prevented from being contained in the exhaust gas.

[0075] Let us return to the case where the inorganic solid fuel of this embodiment is low-purity magnesium hydride. In this way, AlCl 3 , and FeCl 3 After removing the gas, the blowing gas is changed from hydrogen chloride to chlorine.

[0076] Then, FeCl 2 reacts with chlorine to give FeCl 3 However, the heating vessel is FeCl 3 Since the temperature is kept above the boiling point of MgCl, it is discharged out of the heating vessel together with the chlorine that is blown out, resulting in the formation of anhydrous MgCl 2 Only the liquid remains in the heating vessel.

[0077] In addition, when the inorganic solid fuel is lithium (Li) or its hydride, the boiling point is around 1380°C, so anhydrous MgCl 2 The same procedure can be used to obtain

[0078] In this way, the process gas is first hydrogen chloride and then chlorine, and the anhydrous chloride production step is carried out in which the process gas is heated while being blown through the stream. This produces anhydrous magnesium chloride (MgCl 2 ) can be obtained.

[0079] In the case of aluminum, since aluminum oxide is used in molten salt electrolysis, the highly pure anhydrous aluminum chloride recovered as described above is again put into pure water, and this time, heated and dehydrated without using a gas such as hydrogen chloride that inhibits hydrolysis, to obtain aluminum oxide. Therefore, when the inorganic solid fuel is aluminum, a reoxidation step of obtaining aluminum oxide from anhydrous aluminum chloride may be carried out prior to the molten salt electrolysis step.

[0080] (Molten salt electrolysis process) The molten salt electrolysis step is a step in which the anhydrous magnesium chloride obtained in the anhydrous chloride production step is supplied to a molten salt electrolysis furnace and subjected to electrolysis to obtain magnesium.

[0081] Specifically, the temperature of the molten salt electrolysis furnace is set to around 700°C, anhydrous magnesium chloride is molten, and the molten magnesium chloride is electrolyzed to produce magnesium.

[0082] In this embodiment, since the inorganic solid fuel is magnesium hydride, a hydrogenation process is carried out to hydrogenate the magnesium obtained in the molten salt electrolysis process.

[0083] Specifically, magnesium hydride as the inorganic solid fuel of this embodiment can be obtained by heat treating magnesium pulverized to 150 μm or less in a hydrogen atmosphere and hydrogenating it. When the inorganic solid fuel is magnesium, the hydrogenation step is not necessary.

[0084] The only energy required for the resource recycling process described above is electricity, so no carbon dioxide is emitted during the resource recycling process.

[0085] It is expected that the proportion of electricity generated using renewable energy will increase in the future. However, there is a problem in that the amount of electricity generated from renewable energy sources generally depends on the natural environment, and excess electricity generated cannot be connected to the power grid.

[0086] In addition, in the case of wind power generation, as equipment is updated and replaced with fewer wind turbines that can generate electricity more efficiently, the problem of old wind turbines being left behind is beginning to come into focus; these are old turbines that are still capable of generating electricity but cannot be connected to the grid due to the capacity of the transmission lines. Therefore, by using such electricity that cannot be connected to the grid, it is possible to receive surplus electricity.

[0087] Although the thermal power generation method according to the present invention has been described above with reference to a specific embodiment, the present invention is not limited to the specific embodiment.

[0088] The above has been explained using the example of a power generation boiler equipped with a burner for combustion in the combustion chamber 21. However, there are also power generation boilers, such as stoker type boilers, which do not use a burner for combustion but simply send fuel into the combustion chamber, and the present invention is also effective in the case of such a type of power generation boiler.

[0089] Even in configurations that do not use such combustion burners, it is advisable to increase the humidity within the combustion chamber, for example by supplying air with a humidity level of 50% or higher into the combustion chamber, in order to suppress the formation of magnesium nitride.

[0090] Furthermore, in the case of a power generation boiler that does not use such a combustion burner, the coal is burned as lump coal, so there is no need for the inorganic solid fuel to be pulverized.

[0091] As mentioned earlier, magnesium, lithium, and aluminum are highly flammable when reduced to fine powder, but generally, when the particle size is 400 μm or more, they are no longer considered hazardous materials under the Fire Service Act.

[0092] Therefore, for power generation boilers that do not use combustion burners, it is best not to pulverize the powder, but to keep it at a size of 400 μm or more so that it can be combusted without problems together with carbon-containing fuels such as coal.

[0093] Furthermore, in the above, the inorganic solid fuel, magnesium hydride, and pulverized coal are mixed and supplied to the powder combustion burner 31, and the inorganic solid fuel is supplied into the flame formed by the powder combustion burner.

[0094] However, the method of supplying the inorganic solid fuel into the flame formed by the powder combustion burner does not have to be limited to this, and the inorganic solid fuel may be sprayed using a powder sprayer that is installed so as to be able to spray powder toward the flame formed by the powder combustion burner.

[0095] As such, the present invention is not limited to the specific embodiments, and appropriate modifications and improvements are also included within the technical scope of the present invention, which will be apparent to those skilled in the art from the description of the claims. [Explanation of symbols]

[0096] 1. Generator 2. Power generation boilers 21 Combustion chamber 22 Steam turbine 23 Piping 3. Fuel Storage 31 Powder combustion burner 4 Fuel Storage 5 Auxiliary Fuel Storage 51 Auxiliary combustion burner 6 Denitration equipment 7 Dust collector 8 Desulfurization equipment 9. Ash Storage 10 Exhaust pipe 11 Exhaust fan C Coal crusher FU Condenser P Water supply pump

Claims

1. A thermal power generation method in which a fuel containing carbon and an inorganic solid fuel not containing carbon are mixed and burned in a combustion chamber of a power generation boiler, comprising the steps of: A thermal power generation method, wherein the inorganic solid fuel is made of one or more materials selected from magnesium, lithium, aluminum, and hydrides in which magnesium, lithium, and aluminum are at least partially hydrogenated.

2. 2. The thermal power generation method according to claim 1, wherein the inorganic solid fuel is made of one or more materials selected from the group consisting of magnesium and hydrides in which at least a portion of magnesium is hydrogenated.

3. The thermal power generation method according to claim 1 , wherein the fuel containing carbon is a solid fuel mainly composed of carbon.

4. The solid fuel is in powder form, The solid fuel is burned using a powder combustion burner provided in the combustion chamber, The thermal power generation method according to claim 3 , wherein the inorganic solid fuel is supplied into a flame formed by the powder combustion burner.

5. The thermal power generation method according to claim 1 , wherein the carbon-containing fuel is a hydrocarbon fuel that is liquid or gaseous at room temperature and pressure.

6. The hydrocarbon fuel is combusted using a combustion burner provided in the combustion chamber, The thermal power generation method according to claim 5 , wherein the inorganic solid fuel is supplied into the flame of the combustion burner.

7. During the co-firing, the humidity in the combustion chamber is increased. The thermal power generation method according to claim 1.

8. A method of burning a mixture of fuel containing carbon and inorganic solid fuel not containing carbon in a combustion chamber of a boiler device. To make, How to operate a boiler system.

Images