JP3179018B2 - Exhaust gas cooling equipment in ash melting furnace equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ash-melting furnace for cooling high-temperature exhaust gas discharged from a ash-melting furnace of a burner type, a plasma type, an arc type or the like and introducing it into a bag filter as a dust collector. The present invention relates to an exhaust gas cooling device in equipment.

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional exhaust gas cooling device includes a cooling chamber 2A in a casing 1 for cooling an exhaust gas G blown downward from above by a cooling water nozzle 3 for injecting cooling water. A dust separating portion 2B is formed below the cooling chamber 2A to separate the entrained dust by diverting the exhaust gas G upward, and a dust formed by a screw feeder for discharging the separated dust is formed below the dust separating portion 2B. A discharge device 4 is provided.

In the above configuration, the exhaust gas G introduced into the cooling chamber 2A from the upper end inlet 1a of the casing 1 is cooled by the cooling water injected from the cooling water nozzle 2, and the exhaust gas G is further upward in the dust separating section 2B. The diverted and entrained dust is separated, then discharged from the upper outlet 1b and introduced into the bag filter via the exhaust gas duct. The dust separated by the dust separation unit 2B is discharged by the dust discharge device 4.

[0004]

However, in the above configuration, the exhaust gas G heated to 1200 ° C. in the ash melting furnace is
The temperature at the inlet 1a is about 800 ° C., and furthermore, it is rapidly cooled to about 2 to 300 ° C. by cooling water in the cooling chamber 2A. The dust adheres and solidifies on the inner surface of the sample 1, and the deposit grows by the operation for a long time to generate a dust lump D. This dust mass D grows very hard and large, and sometimes a dust mass D of 50 cm square may be separated from the inner surface and fall naturally. This allows
In some cases, the dust discharge device 4 was damaged, and the discharge of the dust lump D became difficult, and the operation of the ash melting furnace became difficult.

[0005] In addition, such dust lump D is to be removed by dropping the dust lump D adhered to the inner surface of the casing 1 while the furnace is stopped, but since the dropped lump D is hard and large. , It is extremely difficult to discharge the dust from the dust discharger 4, and requires a great deal of labor for pulverization.
It takes a lot of effort to get it out of.

The present invention provides an exhaust gas cooling device in an ash melting furnace facility which solves the above-mentioned problems and can prevent the dust discharging device from being damaged by dust particles dropped from the inner surface of the casing and can easily discharge the dust particles. The purpose is to do.

[0007]

According to a first aspect of the present invention, there is provided a cooling water jet for injecting cooling water into exhaust gas at an upper portion of a cooling chamber to which exhaust gas is supplied from above. A nozzle is disposed, and in a lower part of the cooling chamber, a dust separating part for separating dust from exhaust gas and an exhaust gas cooling device in an ash melting furnace facility having a dust discharging device for discharging separated dust, the dust separating part of the cooling chamber A screen for receiving a dust lump is disposed at the entrance of the screen, and a dust lump that can be opened and closed is provided on the side wall of the cooling chamber corresponding to the upper surface of the screen, and the dust lump received on the screen is discharged to the dust lump. A dust lump discharging device for extruding the dust lump.

[0008] According to the above configuration, the dust lump spontaneously peeling off from the inner surface of the cooling chamber is received by the screen, so that the dust discharging device is not damaged. Further, the dust lump dropped on the screen can be discharged to the outside from the dust lump discharge port by the dust lump discharge device, and can be easily taken out.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Here, an embodiment of an exhaust gas cooling device (gas cooler) in an ash melting furnace facility according to the present invention will be described with reference to FIGS. The same members as those in the related art are denoted by the same reference numerals, and description thereof will be omitted.

The side wall 1c of the cooling chamber 2A is formed in a rectangular cross section, and a screen 11 is horizontally arranged at the lower end of the side wall 1c at the entrance of the peripheral wall 1d of the dust separating section 2B in a circular cross section. The screen 11 is formed of, for example, a bar screen having a pitch of about 20 mm that receives the falling dust lump D and allows the exhaust gas G to pass therethrough.
A dust lump outlet 12 for discharging dust lump D is formed on one side wall 1c in the length direction of the bar corresponding to the upper surface of the screen 11, and the dust lump outlet 12 is vertically moved by an opening / closing cylinder 13. Opening / closing plate 14 which can be opened and closed by sliding in the direction
And a discharge chute 16 that guides the discharge chute.

On the other side wall 1c side, there is provided a dust lump discharging device 17 for pushing the lump D of dust into the lump discharging opening 12, and the lump discharging device 17 is driven by a discharging cylinder 18 to move in and out. Pusher 19
A pusher insertion port 20 is formed on the other side wall 1c and into which a pusher 19 can be inserted, and an opening / closing gate 22 that can be moved up and down by an opening / closing cylinder 21 to open and close the pusher insertion port 20.

In the above configuration, when the ash melting furnace is operated to discharge the high-temperature exhaust gas G into the cooling chamber 2A from the inlet 1a of the casing 1, cooling water is injected from the cooling water nozzle 3 to cool the ash. Then, the air is introduced from the cooling chamber 2A to the dust separating portion 2B via the screen 11, and is diverted upward to the bag filter. This dust separation unit 2
The dust accompanying the exhaust gas G at B is separated and falls,
It is discharged by the dust discharge device 4.

When the high temperature exhaust gas G is cooled in the gas cooling chamber 2A, the low melting point metal and the like contained in the exhaust gas G are condensed and solidified, adhere to the inner surface of the side wall 1c, and grow. When the dust mass D is separated from the side wall 1c and falls naturally, the dust mass D is received by the screen 11,
The dust discharge device 4 is not damaged by the dust lump D. Also, when the dust mass D attached to the inner surface of the casing 1c is removed from the inspection port (not shown) at the time of maintenance, the large dust mass D is received by the screen 11. Then, the dust lump discharge port 12 and the pusher insertion port 20 are opened, and the discharge cylinder 18 of the dust lump discharge device 17 pushes the pusher 19 through the pusher insertion port 20 into the cooling chamber 2A.
The dust lump D on 1 is pushed out from the dust lump discharge port 12 to the discharge duct 16, and the dust lump D is discharged to the discharge tray 15.

According to the above-described embodiment, even when a large dust lump D falls and falls, it is received by the screen 11, so that the dust discharge device 4 is not directly hit and is not damaged. Further, the dust lump D received by the screen 11 can be discharged to the outside from the dust lump discharge port 12 by the dust lump discharge device 17, and the dust lump D can be discharged easily and quickly.

In the above embodiment, the screen is arranged in the horizontal direction, but may be arranged at an angle. Further, the pusher 19 can be disposed in the cooling chamber 2A and the pusher insertion port 20 can be omitted.

[0016]

As described above, according to the first aspect of the present invention, since dust particles that fall off from the inner surface of the cooling chamber by natural separation are received by the screen, the dust discharging device may be damaged. Absent. Further, the dust lump dropped on the screen can be discharged to the outside from the dust lump discharge port by the dust lump discharge device, and can be easily taken out.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an embodiment of an exhaust gas cooling device in an ash melting furnace according to the present invention.

FIG. 2 is a sectional view taken along line AA shown in FIG.

FIG. 3 is a front sectional view showing the exhaust gas cooling device.

FIG. 4 is a front sectional view showing a conventional exhaust gas cooling device.

[Explanation of symbols]

 G Exhaust gas D Dust lump 1 Casing 1c Side wall 2A Cooling chamber 2B Dust separation part 3 Cooling water nozzle 4 Dust discharging device 11 Screen 14 Opening / closing plate 16 Discharge chute 17 Dust lump discharging device 18 Discharge cylinder 19 Pusher 20 Pusher insertion port 22 Opening / closing gate

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hideo Sato 5-3-28, Nishikujo, Konohana-ku, Osaka-shi, Osaka Inside Hitachi Zosen Corporation (56) References Japanese Utility Model 197-35728 (JP, U) ( 58) Field surveyed (Int.Cl. ⁷ , DB name) F23J 15/06 B01D 47/06

Claims (1)

(57) [Claims] A cooling water nozzle for injecting cooling water into the exhaust gas is disposed above a cooling chamber to which the exhaust gas is supplied from above, and a dust separating unit and a separation unit for separating dust from the exhaust gas below the cooling chamber. In an exhaust gas cooling device in an ash melting furnace facility provided with a dust discharge device for discharging waste dust, a screen for receiving a dust lump is arranged at an entrance of a dust separation part of a cooling room, and a cooling room corresponding to an upper surface of the screen is provided. Exhaust gas cooling device in an ash melting furnace facility, wherein a dust lump discharge port that can be opened and closed is provided on a side wall of the ash melting furnace, and a dust lump discharge device that extrudes dust lump received on a screen to the dust lump discharge port is provided. .