JPH059479A - Method for reforming heavy oil fuel - Google Patents

Abstract

PURPOSE:To reform a heavy oil fuel so that it burns at a high combustion efficiency with little smoke dust generation. CONSTITUTION:A heavy oil 11, a powdered additive 42, and an iron-based material 44 are mixed and stirred to cause the iron-based material to wear out, and the remaining coarse particles of the iron-based material are removed from the mixture, thus giving a reformed heavy oil contg. the additive and the finely powdered iron-based material as a catalyst for combustion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reforming heavy oil fuel used in heavy oil-fired boilers for industrial and business use.

[0002]

2. Description of the Related Art In a conventional heavy oil combustion system in a boiler or the like, only the treatment for increasing the temperature of the heavy oil and improving the spraying by a burner due to a decrease in viscosity is performed. FIG. 2 is a system diagram of a conventional combustion device of this type, in which heavy oil is directly sent from a fuel tank 10 to a boiler 30 by a pump 20 and burned.

[0003]

[Problems to be Solved by the Invention] With a fuel having a low volatile content such as heavy oil, even if it is sprayed in a fairly good burner (average spray particle size is about 100 μm), it will not burn out completely and will not burn. Often occurs.

This is because the burning rate of residual carbon in the fuel is very slow, and the structure of residual carbon having such a slow burning rate is a "flow structure". Even with the same residual carbon, those with a “mosaic structure” have a high burning rate and excellent burn-out characteristics, but most of the residual carbon in heavy oil forms a “flow structure”.

The above "mosaic structure" means that residual carbon exists as a group of apparent particles having a size of several μm, and the above "flow structure" means that residual carbon does not form a group of particles. It does not exist, but it exists for a long time as if it were flowing.

The present invention is intended to provide a method for reforming a heavy oil fuel which can solve the above problems in the conventional combustion of heavy oil.

[0007]

A method for reforming a heavy oil fuel according to the present invention comprises adding a finely powdered additive and an iron-based material to heavy oil, mixing and stirring the iron-based material. At the same time, the fine powder of the iron-based material and the finely powdered additive were mixed in the heavy oil while being abraded, and the coarse particles of the iron-based material were separated from the heavy oil.

[0008]

In the present invention, the mixed state of the fine powdery additive and the heavy oil is caused by collision and friction of the ironous material by mixing and stirring the heavy oil to which the finely powdered additive and the iron-based material are added. Becomes uniform. At the same time, the fine powder of the iron-based material is uniformly mixed into the heavy oil due to the wear of the iron-based material.

Then, by separating the coarse particles of the iron-based material from the heavy oil, a modified heavy oil in which the fine powdery additive and the fine powder of the iron-based material are uniformly mixed can be obtained.

In this reformed heavy oil, the finely powdered additive uniformly mixed serves as a core for the "flow structure" of residual carbon.
Has a "mosaic structure" with a fast burning rate. In addition, the fine powder of iron-based material mixed in heavy oil serves as a combustion catalyst in the high temperature region of the combustion field, promotes the formation of residual carbon "mosaic structure", promotes the combustion reaction, and reduces the amount of unburned dust. Reduce. Therefore, the reformed heavy oil is efficiently burned in a state where the amount of unburned dust is small.

Further, iron-based coarse particles are removed from the heavy oil, and the burner or the like is not damaged. From the viewpoint of changing the state of residual carbon in heavy oil from "flow structure" to "mosaic structure", the finer the particle size of the finely powdered additive used in the present invention, the better. 2 mm
The following is desirable. Further, the fine powder additive basically needs to be particles whose diameter is as small as possible, but it is necessary to avoid those which adversely affect the properties of combustion exhaust gas, and fine powder such as carbon black, Ca, iron (Fe), etc. Is used.

Further, as the iron-based material, Fe, Fe ₂ O
_3, F _e3 O ₅ or the like is used, mixing of the, the particle size of the fine powder of iron-based material be 0.2mm or less contained in the heavy oil separated coarse iron-based material after stirring desirable.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. The heavy oil 11 sent from the fuel tank 10 by the pump 20 is a rotary mixing stirrer 40 such as a rod shell type.
Is supplied to. At the same time, the finely powdered additive 42 and the iron-based material 44 such as iron scrap are supplied to the mixing stirrer 40. As the fine powder additive 42, roughness 0.2mm or less of the carbon black, fine powders such as Ca or Fe is used, and as the iron-based material _{44, Fe, Fe 2 O 3} , F e3 O 5
Etc. are used.

In the mixing stirrer 40, the iron-based materials collide with each other due to the rotation and fine powder of the iron-based material is produced by friction, and the additive 42 and the heavy oil 11 are uniformly mixed.

The property-improved heavy oil 41 discharged from the mixing stirrer 40 is introduced into a coarse-grain classifier 50, and coarse particles having a size of 0.2 mm or more are removed. The coarse particles 51 are returned to the mixing stirrer 40 again. The reformed heavy oil 52 without coarse particles from the coarse particle classifier 51 is used as fuel for the boiler 30.
Be thrown into.

In the modified heavy oil 52 in which the finely powdered additive 42 and the fine powder of the iron-based material are mixed, the residual carbon is formed from the "flow structure" to the "mosaic structure" with the finely powdered additive 42 as the core. In this state, the combustion speed is fast, and the fine powder of the iron-based material serves as a combustion catalyst in a high-temperature combustion product, and promotes the "mosaic structure" of residual carbon and the combustion of heavy oil. Therefore, the reformed heavy oil 52 can be efficiently burned in the boiler 30 with a small amount of unburned dust.

Further, coarse grains of the iron-based material are separated from the reformed heavy oil 52, and the coarse-grained iron-based material is used for the boiler 3.
Combustion is possible without damaging the burner etc. without bringing it into the 0.

[0018]

As described above, according to the present invention,
Carbon powder is made into a "mosaic structure" by finely powdered additives, and fine particles of iron-based materials that act as combustion catalysts are mixed in to enable efficient combustion and a reformed heavy oil that produces less unburned dust. Can be obtained.

[Brief description of drawings]

FIG. 1 is a system diagram of an embodiment of the present invention.

FIG. 2 is a system diagram of a conventional combustion device.

[Explanation of symbols]

 10 Fuel Tank 11 Heavy Oil 30 Boiler 40 Mixing Stirrer 42 Fine Powder Additive 44 Iron-based Material 50 Coarse Grain Classifier 52 Reformed Heavy Oil

Claims (1)

Claim: What is claimed is: 1. A fine powdery additive and an iron-based material are added to heavy oil, which are mixed and stirred to abrade the iron-based material and fine powder of the iron-based material. A method for reforming a heavy oil fuel, which comprises mixing the finely divided additive into heavy oil and separating coarse particles of an iron-based material from the heavy oil.