Title:
Device for eliminating an adherent substances in the industrial waste incinerator
United States Patent 3918375


Abstract:
A device for eliminating adherent substances on a furnace wall comprises a hollow rod which can reciprocate in a certain range in proximity to the furnace wall and in parallel to the surface of the furnace wall, scrapers which are provided on the rod, and an air injection nozzle which is provided near the scraper. By moving the scrapers relative to and in parallel with the furnace wall which rotates continuously, the adherent substances sticking to the furnace wall are taken off by means of the scrapers. The adherent substances taken off are blown away by the injection of compressed air from the air injection nozzle. Simultaneously therewith, local combustion is rapidly induced to perfectly burn the adherent substances.



Inventors:
Hayakawa, Shuichi (Tokyo, JA)
Hironaka, Toru (Yamaguchi, JA)
Osada, Yukinori (Yamaguchi, JA)
Tamura, Heihachiro (Tokyo, JA)
Takayama, Toru (Chiba, JA)
Saito, Shiro (Kanagawa, JA)
Application Number:
05/489062
Publication Date:
11/11/1975
Filing Date:
07/16/1974
Assignee:
SANKI ENGINEERING CO., LTD.
Primary Class:
Other Classes:
15/104.16, 110/343, 432/75
International Classes:
F23J1/06; B08B5/02; F23G5/20; F23G7/12; F23J1/00; (IPC1-7): F23G5/06; B08B9/08
Field of Search:
110/14 432
View Patent Images:
US Patent References:
3823677GRAVITY FLOW INCINERATOR1974-07-16Polsak
3667743N/A1972-06-06Kovalcik et al.
3025548Furnace cleaning device1962-03-20Benkenstein
2391443Removal of deposits from the interior surfaces of coke ovens1945-12-25Bruton
1929880Process of incinerating and equipment therefor1933-10-10Darrah
1220827N/A1917-03-27Downs



Primary Examiner:
Sprague, Kenneth W.
Attorney, Agent or Firm:
Stevens, Davis, Miller & Mosher
Claims:
What we claim is

1. A device for eliminating adherent substances on a furnace wall in an industrial waste incinerator comprising:

2. A device for eliminating adherent substances on a furnace wall in an industrial waste incinerator comprising;

3. The device according to claim 1, wherein said cooling means comprises a pipe which is shorter than said hollow rod and which is provided in the interior of said hollow rod, and wherein a water feed port communicating to the shorter pipe is provided at an end part of said hollow rod while a water exhaust port is provided at a position opposite to said water feed port.

4. A device for eliminating adherent substances on a furnace wall in an industrial waste incinerator, comprising:

5. A device for eliminating adherent substances on a furnace wall in an industrial waste incinerator comprising:

6. The device according to claim 5, wherein said hollow rod is mounted within a cylindrical cap at the rear end of said rod, and said hollow rod is coupled with said reciprocating mechanism at a fore end position of a bracket extending from said cap.

Description:
This invention relates to an industrial waste incinerator, and more particularly to a device for automatically eliminating adherent substances in the incomplete combustion state as stick inside a furnace wall.

When the distillation residue as well as the catalysis residue of petrochemical products, the plastics waste, or the like industrial waste is burnt up, unburnt substances consisting of a highly viscous melt and a solid matter mixed together come to adhere to a furnace wall in lumps or blocks with the lapse of time, and thus lower the combustion effeciency. In case of a pan incinerator which is small in size, it is possible to sometimes stop the running and to eliminate the adhering substances by the hand work. In case of a large-sized furnace such as kiln type incinerator, however, the continuous running is made as a rule, and hence, it is usually difficult to specially stop the running in order to remove the adherent substances. It is therefore desired to develop a technique for automatically eliminating the adhesive blocks during the running of the furnace.

This invention intends to provide a device which eliminates the substances adhering to the furnace wall of the incinerator. To this end, according to the present invention, a hollow rod is mounted along the lengthwise direction of the furnace at a position close to the wall of the incinerator, and the adherent substances of the furnace wall are taken off with a scraper by reciprocating the rod. Since the scraper reciprocates in contact with that part of the furnace wall to which the substances are prone to stick, the adherent substances on the whole area of the furnace wall as covered by the stroke length of the reciprocation are fully scraped off. If left as it is, the scraped block has its surface molten by the temperature of the interior of the furnace and adheres to the furnace wall again. For this reason, it is blown away simultaneously with the scraping by means of compressed air from an air injection nozzle which is provided in proximity to the scraper, and it is locally burnt rapidly by the air supply. The component made inorganic by the rapid combustion does not stick to the furnace wall yet, and it rolls within the furnace and is automatically discharged. In actuality, the adherent substances of the incomplete combustion are deposited substantially continuously on the furnace wall in a certain range from the charging side towards the inner part of the kiln type incinerator. A part of the adherent substances as lies on the charging side of the furnace is comparatively hard and need be taken off by the action of the scraper, whereas a part on the inner side is somewhat fragile. Accordingly, when the hollow rod is moved in parallel with the furnace wall, the adherent substances on the furnace wall close to the charging side are taken off by the scraper and are rapidly burnt by the blast of the compressed air. The adherent substances at the deeper part add to fragility gradually, and hence, they are almost blown away and burnt rapidly by the blast of the compressed air, to be made inorganic and to be gathered up by the scraper. In this way, it is possible to always keep good the combustion state in the incinerator and to perfectly burn up and dispose the industrial waste.

As apparent from the above description, the principal object of this invention is to provide a device which readily eliminates adherent substances on the wall of an industrial waste incinerator.

Another object of this invention is to provide a device which scrapes off adherent substances sticking to the wall of an incinerator, simultaneously blows them away by air blast and simultaneously subjects them locally to rapid combustion, so that the adherent substances can be prevented from sticking again.

Still another object of this invention is to provide a device which eliminates adherent substances on the wall of an incinerator by blowing them away with compressed air and gathering them up with a scraper.

Yet another object of this invention is to provide a device which scrapes away adherent substances on the wall of an incinerator, thereafter rapidly burns them into inorganic substances and thereafter automatically discharges them, whereby the combustion state in the furnace is made good, and the incinerating disposal of the industrial waste is made effective.

Further objects of this invention will become more definite from the following detailed description when read with reference to the accompanying drawings, in which:

FIG. 1 is a side view showing the mounting of the device of this invention on a furnace body;

FIG. 2 is a plan view corresponding to FIG. 1;

FIG. 3 is an enlarged front view taken in the direction of arrows of a line III--III in FIG. 1; and

FIG. 4 is an enlarged longitudinal section of a hollow rod as taken in the direction of arrows of a line IV--IV in FIG. 3.

Throughout the drawings, like reference symbols designate like constituent parts.

The drawings illustrate a case where the present invention is applied to a rotary kiln type incinerator. FIG. 1 is a side view showing the hind half part of the rotary kiln type incinerator and an adhesion preventing device mounted thereon, while FIG. 2 is a plan view showing the same.

The kiln type furnace 1 is installed in a manner to slightly incline with its fore end lowered. A chute and a pushing-in device (not shown) for charging a material to-be-incinerated are provided at a rear opening portion 11 of the kiln type furnace. The incinerator burns the material to-be-incinerated while slowly rotating the furnace body, and discharges the ash content from the fore end of the furnace body to the exterior of the incinerator.

As shown in the figures, a hollow rod 2 which is proximate to a furnace wall 10 and which can reciprocate in parallel to the wall surface is provided on the back side of the furnace 1. Scrapers 3 and 4 for removing adherent substances are mounted at the fore end and an intermediate part of the hollow rod 2, respectively. A cylinder mechanism 5 is provided near the hind end of the hollow rod 2 and in parallel with the hollow rod, and the end part of the rod 6 is joined to the hind end of the hollow rod 2. Thus, a reciprocating mechanism is constructed. It is also allowed to employ any other reciprocating mechanism in which, by way of example, the cylinder mechanism is replaced with a rack and pinion.

As enlarged and shown in FIGS. 3 and 4, the hollow rod 2 is equipped therein with a pipe 7 for introducing compressed air, which pipe is joined to an air injection nozzle 8 provided near the fore end scraper 3. A pipe 9 for supplying cooling water is also inserted in the hollow rod 2.

The air injection nozzle 8 may alternatively be disposed at the scraper 4 at the intermediate part of the rod. Further, the air injection nozzles may be disposed at both the fore end scraper and the intermediate scraper.

As shown in FIG. 3, the scrapers 3 and 4 are arranged in proximity to the furnace wall 10 at an acute angle to the rotational direction thereof, and are adapted to take off the adherent substances on the wall surface. The injection nozzle 8 is led from an end plate 12 of the hollow rod 2, it is bent into an L-shape, and it opens near the lower edge of the fore end scraper 3.

As illustrated in FIG. 4, at the rear end part of the hollow rod 2, an end member 14 is secured through a flange portion 13, and it is covered with a cylindrical cap 15. The cylindrical cap 15 has a bracket 16. The rear end of the rod 6 of the reciprocating mechanism is fastened to a pin 17 at the front end of the bracket 16. In the interior of the cylindrical cap 15, a pair of rings 18 and 19 are secured at an interval, and a ring member 20 secured to the periphery of the end member 14 is arranged between the rings 18 and 19. When the rod 6 of the reciprocating mechanism moves leftwards in FIG. 4, one ring 19 inside the cylindrical cap 15 pushed the ring member 20 so as to move the hollow rod 2 leftwards. Conversely, when the rod 6 is moved rightwards, the other ring 18 pushes the ring member 20 so as to move the hollow rod 2 rightwards.

The compressed air-introducing pipe 7 penetrates through the flange portion 13 and orthogonally turns substantially in the middle of the end member 14. It penetrates through the ring member 20 as well as the cylindrical cap 15. Then, it is joined to a compressed air source in the exterior. A water feed port 21 communicating to a flexible hose is provided near the flange portion 13 of the hollow rod 2 and is joined to the pipe 9, while a water exhaust port 22 communicating to a flexible hose is provided at a position opposite to the water feed port 21. The cooling water enters the pipe 9 from the water feed port 21, it flows into the hollow rod 2 from an open end of the pipe 9 near the front end of the hollow rod 2, and it passes through the interior of the hollow rod 2 as shown by an arrow in FIG. 4. After thus effecting cooling, it is discharged from the water exhaust port 22.

As shown in FIG. 4, a shear pin hub 23 is secured to that part of the hollow rod 2 which is close to the water feed and exhaust ports 21 and 22. An opposite flange 24 is locked by a shear pin 25. The flange 24 is formed sidewards with a cylinder portion 26. At the lower part of the cylinder portion 26, there is provided a guide pin 27, which is inserted in a guide rail 28. Upon actuation of the reciprocating mechanism, the hollow rod 2 is reciprocated straight by the guide of the guide rail 28 and the guide pin 27. The lump or block adhereing to the furnace wall 10 is taken away by the scrapers 3 and 4. When the adherent matter becomes harder than is anticipated or any foreign matter sticks hard, it intrudes between the furnace wall 10 and the scraper 3 or 4. Then, the turning force of the furnace body is transmitted to the hollow rod 2, and the supporting portion for the hollow rod 2 is destroyed. When such turning force arises, the shear pin 25 is broken to release the coupling with the shear pin hub 23. The guide pin 27 is therefore disengaged from the guide rail 28. At the same time, it is indicated by, for example, the flickering of a lamp (not shown) that the scraper has bitted the adherent matter. After the bite of the scraper, the hollow rod 2 is retreated and is reset at the right position. A new shear pin 25 is inserted between the hub 23 and the flange 24. Thus, the reciprocation of the hollow rod 2 is restarted.

In the forgoing apparatus, the material to-be-incinerated is charged from the rear portion 11 of the kiln type furnace 1. The material is burnt while flames are being blown from the front end side and the kiln is being rotated. Then, several % of the material to-be-incinerated becomes incompletely burnt substances and adheres to the furnace wall 10. In general, the adherent substances are deposited almost continuously with the lapse of time. Since they gradually increase in hardness, the reciprocating mechanism of the hollow rod 2 is actuated at, for example, every 2 - 3 hours before they become considerably hard.

In the adherent substances, a part on the furnace wall close to the charging side 11 of the furnace is formed so hard that it need be taken off by the action of the scrapers 3 and 4. A part in the depth of the furnace is somewhat fragile.

The adherent substances deposited on the furnace wall 10 are rotated with the rotation of the furnace body. When the hollow rod 2 is moved in parallel with the furnace wall, the adherent substances on the furnace wall close to the charging side are struck by the scrapers 3 and 4 and are successively taken off. Simultaneously therewith, they are blown away by the blast of compressed air of, for example, 2-5 kg/cm2, preferably 3-5 kg/cm2, from the air nozzle 8 provided at the lower edge of the scraper. Thus, they are locally subjected to rapid combustion. On the other hand, the adherent substances on the furnace wall 10 at the deeper furnace part gradually increase in fragility. Therefore, they are mostly blown away by the blast of the compressed air. They are rapidly burnt to become inorganic, and are gathered by the scrapers. The inorganic component after the rapid combustion owing to the presence of the compressed air is prevented from re-adhering onto the furnace wall, and it is discharged from the fore end of the furnace while rolling on the bottom of the kiln.

The size, hardness etc. of the adherent substances to be produced on the furnace wall differ in dependence on the composition of the material to-be-incinerated, the amount of charge, the incinerating temperature etc. If an automatic control system is assembled which automatically reciprocates the hollow rod at every several hours in which the adherent substances are so deposited as to be easily taken off by the movement of the scrapers, the elimination of the adherent substances will be achieved readily and automatically.