JP2617555B2 - Burner equipment for swirling flow melting furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to powdery sludge, its ash and air through a burner to a swirling flow melting furnace of sludge such as sewage, human waste, industrial wastewater, or ash treatment equipment. It relates to a burner device to blow.

[Conventional technology]

Sludge (dry matter) such as sewage, human waste, and industrial wastewater, and ash produced by incineration of the sludge are blown into a melting furnace as a powder, and among the processing means for burning and melting, the material to be melted in the swirling flow melting furnace is used. Regarding the blowing into the furnace, a uniform swirling flow is formed in the furnace and the blowing is supplied from the furnace wall. However, it is difficult to uniformly branch the powder in the pneumatic feeding tube. Burner 1
A feeder system is employed, and a bend radius, a horizontal pipe length, and the like are carefully considered to prevent accumulation, blockage, and wear.

The purpose of treating powder sludge and its ash in a melting furnace is to burn organic matter out of the powder sludge, etc., to melt the remaining inorganic matter by the heat of combustion to reduce the volume, and to discard, embed, etc. This is for facilitating the processing.

[Problems to be solved by the invention]

The burner blowing method of the conventional swirling flow melting furnace has the following problems to be solved.

In other words, it is difficult to divide the powder evenly by the empty pipe,
Since the one-burner, one-feeder system is employed, the number of feeders and the number of pipes increase, and equipment for measures against wear is added, so that the equipment is increased and the cost is increased. Further, since the residence time of flue gas such as sludge and air in the furnace is extremely short, less than one second, it is required that complete combustion be performed within this short time.

[Means for solving the problem]

Means for Solving the Problems The present invention solves the above-mentioned problems, and the means as the gist is to powder sludge discharged from a treatment process of sewage, human waste, industrial wastewater, etc. and ash discharged when incinerating the sludge etc. In a swirling flow melting furnace which is shaped like a tangential direction and blows into the furnace by means of a burner, the burner includes:
A burner inner cylinder in which the powder and the primary air blowing passage are formed, and a burner provided concentrically with the inner cylinder with a secondary air blowing passage outside the inner cylinder. And a plurality of secondary air nozzles for blowing secondary air into the furnace are provided on the same furnace section. A feature of the present invention is a burner device for a swirling flow melting furnace.

[Action]

The present invention has the following effects because it is configured as described above.

That is, a double-cylinder integrated burner in which an inner cylinder for injecting a powdery substance and an outer cylinder for injecting primary air from the outside thereof are concentrically arranged, and an air nozzle for injecting secondary air into the same furnace By arranging a plurality of pieces on the cross section and blowing the powder, primary air, and secondary air from multiple places on the same furnace cross section, the flow velocity can be freely adjusted, so that an ideal swirl flow can be formed. As a result, it is possible to maintain a combustion field due to a uniform swirling flow in the furnace, prevent uneven adhesion of molten slag to the furnace wall, and perform complete combustion in a short time. As a result, a solid phase of uniform thickness The slag is formed, the furnace wall is protected, and the efficiency of slag recovery is improved, and the incineration efficiency is improved by realizing complete combustion in a short time.

Furthermore, the number of burners for blowing powder can be reduced to half the number of conventional burners due to the generation of the swirling flow and the improvement of combustion, and the powder supply equipment and wear-resistant piping can be reduced by half compared to the conventional one. it can.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.

1 is a vertical sectional view of a swirling flow melting furnace according to an embodiment of the present invention, FIG. 2 is a II-II sectional view of FIG. 1, FIG. 3 is a vertical sectional view of a burner, and FIG. FIG. 2 is a diagram showing an embodiment.

1 and 2, reference numeral 1 denotes a melting furnace main body, 1a denotes a furnace wall of the main body 1, and 7 denotes a refractory material.

Reference numeral 30 denotes a burner, which is a double-cylinder integrated burner in which a burner inner cylinder 3 and a burner outer cylinder 4 provided concentrically outside the burner inner cylinder 3 are integrated, as described later.

 Reference numeral 2 denotes an air nozzle for blowing secondary air.

As shown in FIG. 2, the burner 30 and the air nozzle 2 are arranged in the melting furnace body 1 in a tangential direction in the form of a powdery material or a primary material.
Two pieces are provided on the same furnace section and directed so as to blow secondary air, and are provided so as to face each other with a diameter therebetween.

As shown in FIG. 3, the burner 30 has a burner inner cylinder 3 in which a blowing passage 31 for powdery sludge and primary air (conveying air) is formed. And a burner inner cylinder 3 and a burner outer cylinder 4 provided concentrically with the secondary air passage 32 being provided.

In FIG. 1, 6 is a solid phase slag formed in the furnace of the main body 1, 8 is a liquid phase slag, 9 is a falling slag, and 10 is a slag tap portion.

Next, in the swirling flow melting furnace configured as described above,
The details of the embodiment for a treatment scale of 15 tons / day of dewatered sludge will be described.

This melting furnace has a water content of about 5%,
Of the four burners and air nozzles on the circumference of the furnace wall 1a, powdery sludge having a flow rate of 25% flows from the burner inner cylinder 3 of two burners 30 facing each other across the diameter of the furnace wall 1a. ~
Injected with carrier air (primary air) at 50 m / sec. Secondary air is injected at about 50 m / sec from inside the burner outer cylinder 4 which is a double cylinder concentric with the burner inner cylinder 3. Further, as shown in FIGS. 1 and 2, the furnace has the same furnace cross section, that is, the same height as the double-cylinder burner 30 including the burner inner cylinder 3 and the burner outer cylinder 4, and is separated from the burner 30 by a diameter. 30-50m / se secondary air from two air nozzles 2 facing each other
Injected with c. The burner 30 composed of the burner inner cylinder 3 and the burner outer cylinder 4 and the injection angle of the air nozzle 2 are such that the virtual swirl diameter 5 of the swirl flow formed by the blowing flow with respect to the melting furnace body 1 having an inner diameter of 600 mm is 500 mm. Thus, the fuel is injected in the tangential direction of the virtual swirl diameter in the same furnace section. Then, under high temperature conditions (1300 to 1600 ° C.) in the melting furnace, the powdery sludge is burned, melted into slag, adheres uniformly to the furnace wall 1a, and partly turns into solid phase slag 6, The refractory material 7 is protected, and at the same time, the other slag 8 flows down the furnace wall 1a as the slag 9 by gravity as the liquid slag 8, and is discharged and collected from the slag tap portion 10 at the center of the furnace bottom.

Various sludges (organic raw sludge, organic digestive sludge, inorganic raw sludge)
In the continuous melting test (rated load) according to the above example using slag, the furnace temperature was extremely stable, the slag recovery rate was 96% or more for each sludge, and the furnace wall 1a It is observed that a solid slag 6 having a thickness of 3 to 15 mm is uniformly attached to the inner peripheral surface in the circumferential direction, that is, the furnace wall 1a is protected from erosion of the molten slag by self-coating. Has not been eroded is the furnace wall 1a
Of the refractory material 7 was analyzed by partial sampling.

Further, a burner inner cylinder 3 for blowing powder such as sludge together with primary air, a burner outer cylinder 4 for blowing secondary air, and an air nozzle 2 for blowing secondary air are arranged on the same furnace section. Since the powder and the primary air and the secondary air are blown from the same furnace section, the combustion is completed completely in a short time.

If, for example, six burners and air nozzles are required for an increase in the furnace diameter and the number of burners due to an increase in the sludge treatment amount, as shown in FIG. Is used as the burner 30 for blowing, and the remaining three are used as the air nozzles 2, so that the equipment can be reduced. Further, when eight burners and air nozzles are required, there is no need to limit the total number of burners, such as using four burners for blowing powder and the remaining four as air nozzles.

〔The invention's effect〕

The present invention has the following effects because it is configured as described above.

That is, a burner that blows powdered sludge together with air, and independently of the burner, by blowing secondary air from air nozzles arranged at a plurality of circumferential positions in the same furnace cross section as the burner, Quick and stable combustion in the vicinity of the melting furnace wall can be maintained, and the uniform and strong swirl flow
A uniform adhesion of the molten slag to the furnace wall and a high recovery rate of the slag can be obtained, and the life of the furnace wall refractory material can be extended.

In addition, the number of feeders for supplying powder can be reduced from four to two, and the number of pipes subjected to abrasion resistance can be halved, so that equipment cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a swirling flow melting furnace used in the method of one embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG.
The figure is a detailed vertical sectional view of the burner inner cylinder 3 and the burner outer cylinder 4 shown in FIG. 1, and FIG. 4 is a plan sectional view of another swirling flow melting furnace used in the method of the embodiment of the present invention. 1 ... melting furnace main body, 1a ... furnace wall, 2 ... air nozzle, 3 ... burner inner cylinder, 4 ... burner outer cylinder, 5 ... virtual turning diameter, 6 ... solid phase slag, 7 ... Refractory material, 8: Liquid phase slag, 9: Downflow slag, 10: Slag tap, 30: Burner.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshio Goda 12 Nishikicho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Mitsubishi Heavy Industries, Ltd.Yokohama Works (72) Inventor Yoshinori Terasawa 12 Nishikicho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Mitsubishi Heavy Industries (56) References JP-A-63-70014 (JP, A) JP-A-60-233403 (JP, A) JP-A-2-183711 (JP, A) JP-A-49-65532 (JP, A) JP-A-63-75404 (JP, A) JP-A-63-282402 (JP, A) JP-A-60-105915 (JP, U) JP-B-44-9160 (JP, B1)

Claims (1)

(57) [Claims] 1. Sludge discharged from a treatment process of sewage, human waste, industrial waste water, etc., and ash discharged when the sludge or the like is incinerated are turned into powder and blown into the furnace from a tangential direction by a burner. In the swirling flow melting furnace, the burner includes a burner inner cylinder in which the powdery material and the primary air blowing passage are formed, and a secondary air blowing passage outside the inner cylinder. And a burner outer cylinder provided concentrically with the inner cylinder and configured as a double-cylinder integrated burner, wherein the integrated burner and a secondary air nozzle for blowing secondary air into the furnace are provided. A burner device for a swirling flow melting furnace, wherein a plurality of the burner devices are provided on the same furnace section.