JPH0129396Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a different fuel burner that burns solid fuel and liquid fuel simultaneously.

Burning different types of fuel in one burner,
In particular, combustion is carried out by burning powdered solid fuels that are difficult to ignite and are difficult to ignite, such as anthracite coal and petroleum coke, together with liquid fuels such as heavy oil.

Figure 1 shows an example of a different fuel burner.
A liquid fuel nozzle 1 for injecting liquid fuel such as heavy oil is provided at the center, and a solid fuel nozzle 2 is provided around the outer periphery of the liquid fuel nozzle 1. 3 in the figure is the nozzle chip of the liquid fuel nozzle 1;
4 is a liquid fuel pipe, 5 is a nozzle tip of solid fuel nozzle 2, 6 is a solid fuel pipe, 7 and 8 are air flow paths, 9
14 indicates a vane, 10 indicates a furnace wall, etc.

However, in conventional dissimilar fuel burners, the structure of the nozzle tips 3 and 5 is such that the solid fuel flame B is injected so as to surround the outer periphery of the liquid fuel flame A, as shown in FIGS. Therefore, an interference part C between the flames A and B occurs.
There was a problem in which the COM phenomenon occurred. For this reason, the system did not combust solid fuel and liquid fuel at the same time, but instead combusted either fuel independently.

The COM phenomenon is when liquid fuel and solid fuel interfere and mix, as shown in Figure 4.
This refers to a phenomenon in which liquid fuel forms a film b surrounding the outer periphery of a solid particle a. Furthermore, when this phenomenon occurs, the solid particles a tend to combine with each other and form a lump. As a result, when these phenomena occur,
First, the liquid fuel film b on the outer periphery burns, and then the solid particles a, which are hard to burn, are burned, so in the atmosphere of the solid particle combustion area, combined with the lack of oxygen, the flammability is significantly reduced. However, the combustion efficiency was lower than that of each type of simple combustion.

This invention was developed in view of these circumstances, and by separating the liquid fuel and solid fuel blowouts in the circumferential direction, mutual interference between solid and liquid fuel blowouts is eliminated and the occurrence of the COM phenomenon is prevented. The purpose is to promote ignition, reduce the amount of liquid fuel used as auxiliary fuel, and significantly improve the combustion efficiency of solid fuel.

An embodiment of the present invention will be described below based on the drawings.

FIG. 5 shows an example of the present invention applied to the burner shown in FIG.
Liquid fuel injection ports 11 and 11' for injecting liquid fuel in a required angle range α in the circumferential direction are provided symmetrically,
In addition, by closing the outer peripheral positions of the liquid fuel injection ports 11 and 11' with the closing material 12 in the solid fuel nozzle tip 5, the angular range β is
Solid fuel injection ports 13, 13' are formed so that liquid combustion flame A and solid combustion flame B do not interfere with each other.

The above prevents liquid fuel and solid fuel from interfering and mixing when blowing out, and therefore
The occurrence of COM phenomenon can be prevented, and since the liquid combustion flame A and the solid combustion flame B are separated in the circumferential direction, the solid fuel can be effectively heated and burned by the easily flammable liquid fuel. As a result, the combustion efficiency of solid fuel can be dramatically increased. Furthermore, the ignitability is improved, and the amount of liquid fuel used for ignition can be significantly reduced.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and that the blowout angle range and the number of injection ports can be arbitrarily changed as long as the liquid combustion flame and the solid combustion flame do not interfere with each other. Of course, various changes may be made without departing from the spirit of the invention.

According to the above-described dissimilar fuel burner of the present invention, the following excellent effects can be achieved.

(i) Since the liquid fuel and solid fuel blowouts are separated in the circumferential direction, mutual interference between solid and liquid fuel blowouts is eliminated, preventing the occurrence of COM phenomenon, and dramatically increasing solid fuel combustion efficiency. can be improved.

(ii) It has good ignitability and is economical because the amount of liquid fuel used as auxiliary fuel can be reduced.

(iii) It has a simple configuration and can be implemented at low cost.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an example of a different type of fuel burner;
Fig. 2 is an explanatory diagram showing the state of blowing out solid and liquid fuel according to the conventional method, Fig. 3 is a directional view of Fig. 2, Fig. 4 is an explanatory diagram of the COM phenomenon, and Fig. 5 is the same as Fig. 1. FIG. 2 is an explanatory diagram showing an embodiment of the present invention when viewed from the direction of FIG. 1 is a liquid fuel nozzle, 2 is a solid fuel nozzle, 1
1 and 11' are liquid fuel injection ports, 12 is a plugging material, 1
3 and 13' indicate solid fuel injection ports.

Claims (1)

[Scope of utility model registration request] A liquid fuel nozzle having a liquid fuel injection port that blows out liquid fuel with a required angular range in the circumferential direction, and a solid fuel injection port that blows out solid fuel at a position excluding the injection angular range of the liquid fuel injection port in the circumferential direction. A dissimilar fuel burner comprising: a solid fuel nozzle having a solid fuel nozzle;