JP5058528B2 - Cement production fuel supply method and supply system - Google Patents

Description

  The present invention relates to a fuel supply method and supply system for cement production, and more particularly to a method and system for using a low flash point fuel such as a waste solvent as a fuel for cement production.

  Conventionally, attempts have been made to reduce the basic unit of expensive fossil fuels in cement production while using various wastes as substitutes for fuel in the cement production process, contributing to waste disposal. For example, in Patent Document 1, waste plastic and waste oil are mixed, and the slurry mixture is fed to an auxiliary fuel burner inserted in the center of a main fuel (pulverized coal) burner of a rotary kiln to assist the auxiliary fuel burner. A method of manufacturing a cement clinker that is blown into a rotary kiln from a fuel outlet and burned has been proposed.

On the other hand, in Patent Document 2, when a waste oil having a low flash point generated by a tanker or the like is subjected to a combustion treatment, a high flash point oil is added to the waste oil to form a mixed oil, and the flash point of the mixed oil is investigated to obtain a target. A combustion method for waste oil is proposed in which combustion is performed as it is when the flash point is higher than the target flash point, and when the flash point is lower than the target flash point, high flash point oil is added to the mixed oil to increase the flash point and then burned. ing.
JP 2003-192406 A JP 57-2922 A

  As mentioned above, various types of waste have been used in the past as a substitute for fuel in the cement manufacturing process. However, waste solvents containing acetone, gasoline, alcohols, kerosene, light oil, etc. have a low flash point and are designed to prevent explosions. Therefore, it is difficult to replace the fuel in the cement manufacturing process.

  Therefore, the present invention achieves both waste treatment and reduction of fuel intensity in the cement manufacturing process by using low flash point fuel such as waste solvent as a substitute for fuel in the cement manufacturing process. An object of the present invention is to provide a fuel supply method and system.

In order to achieve the above object, the present invention combines a low flash point fuel and another liquid fuel in the middle of a pipeline, and the merged fuel and solid powder fuel are respectively provided in separate pipelines. Through the same burner, a method for supplying fuel for cement production, which is blown into a cement firing furnace or a calcining furnace , wherein the low flash point fuel and the other liquid fuel are combined into the cement firing furnace or the calcining furnace. It is characterized by being carried out at a position within a range of 5 m or more and 50 m or less from the tip of the blowing device into the furnace . Here, the low flash point fuel contains a substance having a flash point of less than 70 ° C., and corresponds to a waste solvent containing acetone, gasoline, alcohols, kerosene, light oil and the like. Forms include liquid, emulsion, slurry and the like. Moreover, the thing containing the combustible liquid classified into the 1st petroleum prescribed | regulated by the Fire Service Act whose flash point is less than 21 degreeC is included. Other liquid fuels refer to high flash point liquid fuels (including liquids, emulsions, slurries, etc.) or low flash point fuels of a type different from the low flash point fuels. Moreover, pulverized coal, powdered oil coke, etc. can be used as solid powder fuel.

Then, according to the present invention, waste processing such as waste solvent as low flash point fuel is obtained by blowing low flash point fuel , other liquid fuel, and solid powder fuel into a cement firing furnace or calcining furnace. In addition, it is possible to simultaneously reduce the fuel intensity in the cement manufacturing process.
In addition, the low flash point fuel and the other liquid fuel can be merged in the middle of a pipeline and blown into the cement firing furnace or the calcining furnace, so that a frame in the furnace can be appropriately formed. At the same time, it is possible to reduce costs related to the production of burners and the construction of refractories. In addition, if a low flash point fuel and other liquid fuels are mixed in a storage tank, etc., a chemical reaction may occur and it may explode, or it may become a hazardous substance, and handling may be difficult. These dangers can be avoided by merging in the middle of the pipeline.
Furthermore, the merging of the low flash point fuel and the other liquid fuel can be performed at a position within 5 m and within 50 m from the tip of the blowing device to the cement baking furnace or calcining furnace. , Not the linear distance from the tip of the blowing device, but the length measured along the pipeline. When the low flash point fuel and other liquid fuel are merged, as described above, a chemical reaction may occur between the two fuels and the risk of an explosion may increase. By merging just before blowing into the furnace, both fuels can be blown into the cement firing furnace and burned before the chemical reaction proceeds, so the low flash point fuel should be used as a safer fuel for cement production. Can do.
In addition, by blowing solid powder fuel in a separate conduit of the same burner as the low flash point fuel, it is possible to properly form the frame inside the furnace, and to reduce costs related to burner production and refractory construction can do.
Furthermore, by blowing the solid powder fuel and the low flash point fuel in parallel, the volatile matter of the solid powder fuel is increased, and the low flash point fuel is used for cement production while improving the combustibility of the solid powder fuel. It can be used as fuel.

Furthermore, the present invention provides a low flash point fuel supply line, another liquid fuel supply line,
And confluence of the two supply lines, a supply pipe of a solid powder fuel, a double fuel merge at the merging point, separately and solid powder fuel from the supply line, via the same burner, cement A fuel supply system for cement production comprising a blowing apparatus for blowing into a firing furnace or a calcining furnace, wherein the junction is within 5 m to 50 m from the tip of the blowing apparatus to the cement firing furnace or calcining furnace It is characterized by being located .

According to the present invention, as in the case of the above-mentioned invention, waste processing such as waste solvent as a low flash point fuel can be simultaneously performed and reduction of the fuel intensity in the cement manufacturing process can be achieved simultaneously. Can be formed appropriately, and furthermore, the costs for the production of the burner and the construction of the refractory can be reduced.
In addition, the solid powder fuel and the low flash point substance are blown in parallel to increase the volatile content of the solid powder fuel, and the low flash point fuel is cemented while improving the combustibility of the solid powder fuel. It can be used as a production fuel.
In addition, by combining low-flash point fuel and other liquid fuels and blowing them from the same pipe, it is possible to properly form the frame inside the furnace, as well as burner production and refractory construction The cost regarding can be reduced.
Further, as described above, the junction point is located within 5 m or more and 50 m or less from the tip of the blowing device to the cement firing furnace or the calcining furnace, and as described above, the low flash point fuel and the other liquid fuel Since both fuels can be blown into a cement firing furnace and burned before the chemical reaction proceeds, a low flash point fuel can be used more safely as a cement production fuel.

  As described above, according to the present invention, a low flash point fuel such as a waste solvent can also be used as a fuel substitute in the cement manufacturing process, and the raw material for waste treatment and the expensive fossil fuel in the cement manufacturing process can be used. Unit reduction can be achieved at the same time.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an embodiment of a cement production fuel supply system according to the present invention. This system 1 is roughly divided into a low flash point fuel tank 2, a high flash point fuel tank 3, a mixer 4 and The burner 5 is provided to supply fuel to a cement firing facility including a cement firing furnace 10 and a clinker cooler 11.

  The low flash point fuel tank 2 is provided for temporarily storing the low flash point fuel, and stores a waste solvent or the like as the low flash point fuel. In addition, if the low flash point fuel is stored in the low flash point fuel tank 2 for a long period of time, it becomes a dangerous substance by mixing with other substances, and it becomes difficult to handle due to precipitation, solidification, etc., so the storage period is short. It is preferable that The low flash point fuel tank 2 is provided with a pump 8 for supplying low flash point fuel to the burner 5 through the mixer 4 and a pipe 6.

  The high flash point fuel tank 3 is provided for temporarily storing liquid high flash point fuel, and stores waste oil or the like as the high flash point fuel. The high flash point fuel tank 3 is provided with a pump 9 for supplying high flash point fuel to the burner 5 through the mixer 4 and a pipe 7.

  The mixer 4 mixes the high flash point fuel supplied from the high flash point fuel 2 and the low flash point fuel supplied from the low flash point fuel tank 2 immediately before the cement firing furnace 10. It arrange | positions from 5 m or more and 50 m or less from a front-end | tip part, Preferably it is 5 m or more and 30 m or less, More preferably, it is 5 m or more and 20 m or less. Further, the mixer 4 may be arranged between the junction of the pipelines 6 and 7 and the burner 5 without being arranged at the junction of the pipelines 6 and 7. The mixer 4 can be a static mixer, an in-line mixer, or the like.

  Next, operation | movement of the fuel supply system 1 for cement manufacture which has the said structure is demonstrated, referring FIG.

  After receiving the low flash point fuel and the high flash point fuel and temporarily storing them in the low flash point fuel tank 2 and the high flash point fuel tank 3, when operating the cement firing furnace 10, the pump 8 and the pipeline 6, The mixture is supplied to the mixer 4 through the pump 9 and the pipe line 7.

  In the mixer 4, both fuels are mixed. Thereby, the uniform combustion in a cement baking furnace or a calcining furnace can be aimed at. In addition, there is a possibility that some problems may occur, such as the reaction of both of the low flash point fuel and the high flash point fuel in the mixer 4 and the possibility of explosion, but after mixing in the mixer 4, The mixture of both fuels is safe because it is immediately supplied to the burner 5 and blown into the cement firing furnace 10 for combustion.

  A mixture of both fuels is blown from the burner 5 into the cement firing furnace 10 and used for cement firing. As a result, low flash point fuels such as waste solvents can be used as a substitute for fuel in the cement manufacturing process, and the effects of waste treatment and reduction in the basic unit of expensive fossil fuel in the cement manufacturing process can be obtained at the same time. be able to.

  In the above embodiment, the case where the low flash point fuel and the high flash point fuel are blown into the cement firing furnace 10 has been described. However, a burner is used in the calcining furnace of the cement firing facility using the same system as described above. Can be blown through, and the same effects as described above can be obtained.

  In the above embodiment, the case where the low flash point fuel and the high flash point fuel are mixed has been described. However, the ratio of the low flash point fuel in the total fuel ranges from 0 to 100% in a wide range. You can choose.

  Furthermore, in the above-described embodiment, the case where the low flash point fuel and the high flash point fuel are blown into a cement firing furnace or the like has been described. However, different types of low flash point fuels may be joined together and blown. For example, waste alcohol as the first low flash point fuel and toluene-based waste solvent as the second low flash point fuel can be merged and blown.

  Moreover, in the said embodiment, although the case where a low flash point fuel and a liquid high flash point fuel were merged was demonstrated, you may merge different types of low flash point fuels.

  Further, the two fuels may not be merged but may be blown into a cement firing furnace or the like from separate supply pipes, and a low flash point fuel and a liquid high flash point fuel or a low flash point fuel may be used. And solid high flash point fuel, or different types of low flash point fuels can be blown together. At this time, the separate supply pipelines may be provided in the same burner, or the respective supply pipelines may be provided in separate burners. In particular, by blowing low-flash-point fuel and high-flash-point solid powder fuel through separate pipes with the same burner, it is possible to properly form the flame in the furnace, The cost required for the construction of the refractory can be reduced.

It is the schematic which shows one Embodiment of the fuel supply system for cement manufacture concerning this invention.

Explanation of symbols

1 Fuel supply system for cement production 2 Low flash point fuel tank 3 High flash point fuel tank 4 Mixer 5 Burner 6 Pipe line 7 Pipe line 8 Pump 9 Pump 10 Cement firing furnace 11 Clinker cooler

Claims (2)

The low flash point fuel and the other liquid fuel are merged in the middle of the pipeline, and the merged fuel and the solid powder fuel are respectively sent from the same burner through a separate pipeline to a cement firing furnace or temporary A fuel supply method for manufacturing cement to be blown into a furnace ,
For the production of cement, the merging of the low flash point fuel and the other liquid fuel is performed at a position within a range of 5 m to 50 m from the tip of the blowing device into the cement firing furnace or the calcining furnace . Fuel supply method. A low flash point fuel supply line;
Other liquid fuel supply lines;
The confluence of both supply lines,
A solid powder fuel supply line;
And both fuel merge at the merging point, before and separately solid powder fuels Campanulaceae supply conduit or al, via the same burner, cement production and a blowing device for blowing to a cement burning furnace or calciner Fuel supply system,
The cement supply fuel supply system according to claim 1, wherein the junction is located within a range of 5 m to 50 m from a tip portion of a blowing device into the cement baking furnace or the calcining furnace .

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