Method for operating combustion furnace

Abstract

To prevent CO2 from being emitted from a combustion furnace in which fuel contains carbon, which enables CO2 reduction that is a pressing countermeasure against global warming.SOLUTION: A method for operating a combustion furnace, in order to reduce an amount of fuel used in the furnace and thereby decrease a discharge amount of CO2, has the following means: either blowing minute metal into the furnace using a blower during combustion in the furnace or injecting minute metal simultaneously with gaseous fuel to undergo combustion in the furnace; injecting minute metal simultaneously with solid fuel to undergo combustion in the furnace; mixing minute metal into solid fuel to undergo combustion in the furnace; providing minute metal around lumps of solid fuel to undergo combustion in the furnace; performing charging of minute metal and lumps of solid fuel alternately and forming layers to undergo combustion in the furnace; and when iron ore and coke are alternately charged into a blast furnace, mixing minute metal into the iron ore in the same manner as with solid fuel. In this manner, CO2 reduction is achieved.

Description

[Technical Field]

[0001] The present invention relates to a method for operating a combustion furnace to suppress CO2 generation from the combustion furnace. [Background technology]

[0002] The fuel used in the combustion furnace is mainly a compound of carbon and hydrogen, and when fuel containing carbon is burned, it generates CO2. The generation of CO2 is also a problem of global warming, so reducing CO2 emissions is an urgent task. Reference 1 describes a blast furnace operation method in which pulverized coal and powdered iron source are simultaneously blown into the combustion furnace with high-temperature air to promote the reduction and melting of iron ore. However, the powdered iron source is a material that promotes melting, not a combustion material. Therefore, the powdered iron source melts but does not burn, and this does not result in a reduction of CO2. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-157712 Summary of the Invention [Problem to be solved by the invention]

[0004] The problem to be solved is to reduce CO2, which is generated when carbon-containing fuel is used in a combustion furnace. [Means for solving the problem]

[0005] The present invention involves adding and utilizing combustible metals such as magnesium, aluminum, and iron as part of the fuel in a combustion furnace, in which the metal has been broken down into easily combustible forms such as fine powder, wool, or needles, thereby reducing the amount of fuel containing carbon by the amount of calories produced by the combustion of the metal. [Effects of the Invention]

[0006] The present invention aims to reduce the amount of carbon-containing fuel in combustion furnaces such as refuse incinerators, melting furnaces, heat treatment furnaces, and thermal power generation furnaces. The effects of this invention include reducing the risk of global warming by reducing CO2, and reducing fuel costs by using inexpensive metals. DETAILED DESCRIPTION OF THE INVENTION

[0007] By adding and using metal as part of the fuel, the amount of fuel containing carbon can be reduced by the amount of calories burned from the metal, by burning metal that has been broken down into small particles that can be combusted in the combustion furnace, such as by mixing it with gaseous fuel, liquid fuel, or solid fuel that will be used in the combustion furnace. [Example]

[0008] During combustion in the furnace, fine metal particles are blown into the furnace with a blower.

[0009] Fine metal particles are injected simultaneously with gaseous fuel and burned in a combustion furnace.

[0010] Fine metal particles are injected simultaneously with liquid fuel and burned in a combustion furnace.

[0011] Fine metal particles are mixed into solid fuel and burned in a furnace.

[0012] Fine metal particles are attached to a mass of solid fuel and burned in a furnace.

[0013] Fine metal and solid fuel chunks are alternately added to form layers and burned in a combustion furnace.

[0014] Paragraphs 0010 to 0015 of this specification may be implemented singly or in combination.

[0015] In the case of iron ore and coke being fed alternately, as in an iron smelting furnace, it is possible to mix fine metals into the iron ore, just as with solid fuel.

[0016] Future challenges Consideration should be given to preventing combustion exhaust gas from polluting the atmosphere due to metal components.

[0017] Combustion heat sources are reused for power generation and boilers, but we need to think about more effective ways to use them. [Industrial Applicability]

[0018] Reducing CO2 emissions is a solution to the problem of global warming, and every industry is working on it, so there is ample potential for industrial use.

Claims

[Claim 1] A method for operating a combustion furnace is characterized in that, in order to utilize metal that has been finely divided to a combustible level, the amount of fuel used in the combustion furnace is reduced, and CO2 emissions are reduced, the fine metal is blown into the combustion furnace with a blower during combustion in the furnace, or the fine metal is injected into the combustion furnace simultaneously with gaseous fuel, or the fine metal is injected into the combustion furnace simultaneously with liquid fuel, or the fine metal is mixed into solid fuel and burned in the combustion furnace, or the fine metal is attached around lumps of solid fuel and burned in the combustion furnace, or lumps of fine metal and solid fuel are alternately charged to form layers and burned in the combustion furnace, or when iron ore and coke are alternately charged into an iron blast furnace, the fine metal is mixed with the iron ore in the same way as the solid fuel.