JP2000279734A - Soot removing structure of dust collecting device in combustion waste-heat recovering system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently recover the dust in discharging gas in a rotary combustion furnace for burning waste and a rotary combustion furnace used for the system for recovering the heat of combustion. SOLUTION: A shield plate 17 for closing and opening the open part of plural bag filters 16 mounted at a dust collecting machine 15 for recovering the dust in the discharging gas by rotating in order is mounted, and a device for imparting vibration to the bag filters 16 is installed. The dust stuck to the bag filter is liable to detach and cleaning effect is large since the discharging gas is not passed through the bag filters 16 in close by this shield plate 17 during the operation of the combustion furnace, and the passage of the discharging gas is executed without trouble at other bag filters 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soot removal structure of a dust collecting apparatus in a combustion furnace for incinerating waste, for example, sludge, livestock manure, waste plastic, and the like.

[0002]

2. Description of the Related Art Conventionally, various combustion furnaces have been developed or their thermal energy has been effectively used. For example, Japanese Patent Application Laid-Open No. 8-285258 discloses an incinerator for incinerating chicken dung,
In a chicken manure combustion waste heat recovery system having a boiler device for recovering combustion heat generated in the incinerator, the incinerator has a double-wall structure having an inner wall and an outer wall, and the inner wall detects a surface temperature of the inner wall. Providing a temperature detecting means for burning inside the inner wall, heating the air in a space surrounded by the inner wall and the outer wall with the combustion heat, and further sending the heated hot air to a heat transfer section of the boiler device. Recovers thermal energy.

In addition, various combustion furnaces have been developed as a power generation system using raw chicken manure as fuel, such as Japanese Patent Laid-Open No. 1-259768, but various substances such as soil contained in chicken manure are discharged as dust. As a result, filter clogging in the dust collector is very severe, which results in impeding combustion.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a combustion furnace for burning flame-retardant substances containing a large amount of non-combustible substances such as chicken dung, or a combustion furnace and a waste heat recovery system therefor. It is an object of the present invention to efficiently remove dust and soot in the accompanying waste gas to further improve combustion efficiency and eliminate air pollution caused by flying media.

[0005]

SUMMARY OF THE INVENTION The present invention is a system of a combustion furnace for incinerating an object to be burned or a system of a combustion waste heat recovery system having a heat exchange device for recovering combustion heat generated in the combustion furnace. In the dust collecting apparatus, a shielding plate for sequentially closing the mouth ends is rotatably mounted on the opening ends of the plurality of bag filter mounting portions mounted in an inverted manner, and a mechanical device is mounted on the bag filter hanging portions. By installing a device that imparts dynamic vibration, the vibration operation made it possible to sequentially and efficiently clean the filter even during furnace combustion.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 5 show a swirling combustion furnace and a combustion heat recovery system incorporating a dust collector according to the present invention in a system thereof. This will be described in detail. Note that the same applies to a combustion device simply consisting of a combination of a combustion furnace and a dust collector, and the drawing is omitted. Although the numerical values in parentheses indicate dimensions in one embodiment, it is a matter of course that the present invention is not limited to this.

FIG. 1 shows an outline of a swirling combustion furnace and a combustion heat recovery system. In this figure, a combustion furnace 1 has a furnace inner wall 2a having a circular cross section (a diameter of 1000 cm), and a small diameter cylindrical body (an outer diameter of 300 cm and an inner diameter of 240 cm) at the center of the furnace. It penetrates the furnace bottom 3 and is inserted upright to the vicinity of the furnace top (the distance from the furnace top is about 10 cm). Therefore, a double wall structure is formed from the furnace bottom to the upper end of the inner cylinder 4 with the furnace wall. Within this range, the inside of the furnace is cylindrical. (The height from the furnace bottom to the furnace top was 1100 cm.)

The incinerator material inlet 5 is provided in the furnace wall 2, and incineration material, for example, chicken manure, is sent from the hopper 20 to the incinerator material inlet 5 via the conveyor 21 and the like, and is charged into the furnace. Configuration. Further, in order to generate a swirling airflow in a cylindrical space 2e surrounded by the furnace inner wall 2a and the inner cylinder 4, a plurality of blowing nozzles 6 for blowing combustion air are arranged at equal intervals on the furnace wall near the furnace bottom. And it is mounted so as to be parallel to the furnace wall in the tangential direction. Further, in order to raise the temperature inside the furnace to a temperature equal to or higher than the ignition temperature of the combustion material in advance, gas,
The crater of the combustion burner 7 using petroleum or the like as a fuel source is provided so as to penetrate the furnace wall. In addition, 2c in FIG. 1 is a viewing window.

An opening 8a is formed in the inner surface of the furnace wall 2 near the furnace top of the combustion furnace 1, and an in-furnace gas circulation path 8 is introduced to 6f immediately before the combustion air supply nozzle 6. Has been established.

Further, an outlet 3a for falling foreign matter is provided at the furnace bottom of a cylindrical space 2e (combustion space) surrounded by the furnace inner wall 2a and the inner cylinder 4.

A lower end 4a of the inner cylinder 4 is connected via a first conduit 9 to a guide port 10a of a reburning chamber 10 having a foreign matter outlet 10b formed at a lower portion thereof. It is connected to a tube type heat exchanger 11 and a dust collector. In addition, an induction blower 23 is provided at the end of these systems.

As described above, the heat exchanger 11 connected to the reburning chamber 10 includes a plurality of (for example, 141) heat exchange pipes 11b, 11b serving as gas passages in a shell 11a formed in the case. , And the lower end of the pipe is in the reburning chamber 10 and the upper end is the cell 11a.
It is opened upright in the exhaust chamber 12 formed above. The cell is filled with water.

At the upper open ends of the heat exchange pipes 11b, 11b are provided compressed air jet nozzles 13, 13 with a slight interval B, and the number of compressed air jet nozzles 13 is several. For example, the branch pipes 13a, 13b,
Alternatively, it is controlled by a process control or the like, and is connected to a compressed air supply source A (not shown) installed outside the exhaust chamber 12.

Further, an exhaust gas discharge port 12a protrudes from a side wall of the exhaust chamber 12, and is connected to a suction port 15f of a dust collecting device 15 via a conduit 14. Further, a steam discharge port 11 c formed on a cell side wall of the heat exchanger 11 is connected to a generator or the like via a steam separator 22.

Next, in the dust collecting device 15 of the present invention, as shown in FIG. 5, the dust collecting chamber is divided into two upper and lower chambers by a partition plate 15c, that is, a gas blowing chamber 15a and a purification chamber 15b.
A plurality of through holes 15d, 15d are formed in the partition plate 15c. At the periphery of the through hole 15d, bag filters 16, 16 made of filter paper, filter cloth, or the like are engaged and mounted along the periphery of the opening end. Further, the filters 16, 16 have their bottoms 16a, 16a suspended in an inverted manner by hooks 15h, 15h provided at the upper part of the purification chamber 15b. Moreover, the hook 15h,
The holding plate 15 s to which 15 h is attached has a structure in which an attached power source 18 such as a motor applies continuous or intermittent vibration operation in the dust collector 15 in the front-back, left-right, or up-down directions. It does not matter that the structure for giving the vibration is a crank mechanism, an electromagnetic mechanism, or any other method.

The lower surface of the partition plate 15c is formed in a fan shape having an appropriate angle, for example, 30.degree. To 45.degree. A shield plate 17 having a sufficient length is attached to a drive shaft 15 e which is suspended from the center of the partition plate, and the drive shaft 15 e is connected to a drive source 18. Therefore, the bag filter 16 closes its opening at the point when the shield plate 17 rotates and reaches just below the shield plate 17 to prevent the combustion gas in the gas blower chamber 15a from flowing in. When the passage is opened, the inflow of the combustion gas is restarted.

As described above, the combustion gas is introduced from the exhaust gas discharge port 12a of the heat exchanger 11 to the intake port 15f protruding from the wall surface 15w of the gas blower chamber 15a via the conduit 14. .

An exhaust gas outlet 15g formed in the upper side wall of the dust collecting device is opened to the atmosphere via an air blower 23.

The operation of the dust collector of the present invention having the above-described structure will be described together with the operation of the swirling combustion furnace and the combustion heat recovery system. First, oil or the like is sprayed and burned by the combustion burner 7 to raise the furnace temperature to an ignition temperature of an object to be burned such as chicken dung (hereinafter referred to as chicken dung), for example, 350 ° C. or more.

After the inside of the furnace is heated to a predetermined temperature, the hopper 2
From 0, chicken manure is introduced into the incineration material inlet 5 through the conveyor 21. At this time, a swirling flow has already been generated in the furnace by the blowing nozzle 6, and the chicken dung is removed from the furnace inner wall 2 a and the inner cylinder 4.
And rises to the ignition temperature or higher and burns while turning in the cylindrical space 2e surrounded by. Then, the combustion gas and the light ash rise in the furnace, and are sucked from the opening at the upper end of the inner cylinder 4 by the negative pressure of the induction blower installed at the end of the combustion waste heat recovery system, and are drawn through the first conduit 9. Through the reburning chamber 10. In addition, foreign substances such as dust and non-combustible substances having a large specific gravity are discharged out of the furnace from the outlet 3a at the furnace bottom.

In the above-mentioned combustion furnace, when poultry manure is introduced, the bottom temperature of the furnace decreases and self-combustion becomes difficult. However, in this combustion furnace, an opening is provided immediately before the combustion air blowing nozzle 6,
The combustion gas at the furnace top is attracted to the air flow of the combustion air discharged from the blowing nozzle 6 through the furnace gas circulation path 8 having the other end opened at the furnace inner wall 2a near the furnace top, and the furnace gas is burned together with the combustion air. Circulated in Therefore, it is possible to maintain a required swirling airflow and significantly supply oxygen required for combustion without significantly lowering the furnace temperature. Also,
The unburned matter in the circulated combustion gas comes into contact with the combustion air having a high oxygen concentration in the lower part of the furnace, and the combustion is further continued to eventually complete combustion.

The combustion waste heat gas sucked from the upper end opening of the inner cylinder 4 and reaches the reburning chamber 10 through the first conduit 9 is reburned in the reburning chamber 10. The reburned gas passes through the heat exchange pipes 11b, 11b of the heat exchanger 11 connected to the reburn chamber 10. This heat exchanger 1
One cell 11a is filled with water, and the combustion gas heats the water to generate steam. This steam passes through a steam separator and is used as heat energy for power generation and the like.

Next, in the heat exchanger 11, heat is exchanged, and the generator is rotated or extracted as simple heat.

The combustion gas that has passed through the heat exchanger 11 is introduced from an exhaust chamber formed at an upper portion thereof into a gas blowing chamber 15a formed at a lower portion of the dust collector 15 through an exhaust gas discharge port 12a and a second conduit 14. And hook 15h from above
And passes through the bag filters 16 suspended therefrom. As a result, dust remains in the filter, and the purified gas is released into the atmosphere. At this time, the shielding plate 1
7 is one to several bag filters 1 by rotating
While closing the openings 6 and 16 sequentially, the combustion gas is passed through all the bag filters.

The dust remaining in the bag filters 16, 16 is sequentially dropped by the vibration of the holding plate 15s to which the hooks 15h, 15h are attached. That is, the central shaft 15 erected below the partition plate 15c
e, a fan-shaped shielding plate 17 that rotates around a fulcrum closes the open ends of some of the bag filters 16, 16, and holds the holding plate 1.
5s gives the filter vibration. As a result, dust in the bag filter whose open end is closed falls on the shielding plate 17 and accumulates, and the filter is cleaned. Next, when the shielding plate 17 is rotated, the accumulated dust falls into the gas passage chamber 15a and another bag filter 16,
16 will be closed. Then, vibration is again applied to the filter 16, and the fallen ash is taken out from the take-out port.

During the above-mentioned vibration, the combustion gas in the bag filter which is not shielded by the shielding plate 17 is sufficiently circulated so that the combustion in the combustion furnace is not hindered. Needless to say, dust does not fall due to the vibration caused by the holding plate 15s due to the passage of the exhaust gas, and the cleaning effect cannot be obtained.

[0027]

In the swirl combustion furnace and the combustion heat recovery system in which the dust collecting apparatus according to the present invention is installed in the system, the effect of reducing the amount of dust medium in the exhaust gas is remarkable as well as the combustibility. .

That is, in the dust collector, a plurality of bag filters are divided into several blocks, the filter openings are sequentially closed, and the filters are vibrated in a state where combustion gas does not flow in, so that dust adhering to the inside of the filter is vibrated. Since the method of dropping the ash was adopted, it was possible to clean the filter without substantially impeding the passage of gas in the filter.

[Brief description of the drawings]

FIG. 1 is a system diagram of an incineration waste heat recovery system showing one embodiment of the present invention.

FIGS. 2A and 2B show a structure of an incinerator, wherein FIG. 2A is a cross-sectional view of the furnace, and FIG.

3A and 3B show a structure of a heat exchanger, in which FIG. 3A is a front view of a partial cross section, FIG. 3B is a front view showing a compressed air discharge nozzle at an upper portion thereof and a peripheral portion thereof, (C) is A-
It is A sectional drawing.

FIG. 4 is a perspective view showing a branch pipe of a compressed air discharge nozzle.

5A and 5B show the structure of a dust collector, wherein FIG. 5A is a front view showing a central vertical section, FIG. 5B is a vertical sectional view showing a mounting portion of a bag filter, and FIG. It is the bottom view which showed the shielding board which closes a part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combustion furnace 2 Furnace wall 3 Furnace bottom 4 Inner cylinder 5 Incineration material charging port 6 Blast nozzle 7 Combustion burner 8 Furnace gas circulation path 9 First conduit 10 Reburning chamber 11 Heat exchanger 12 Exhaust chamber 13 Compressed air discharge nozzle 14 Conduit 15 Dust collector 16 Bag filter 20 Hopper 21 Conveyor 22 Steam separator 23 Induction blower

Continuation of front page (71) Applicant 398067052 Tohru Taka 6-11-30 Tezukayama, Nara City, Nara Prefecture (72) Inventor Shuhei Miyauchi 3428-1, Nagataki, Izumisano-shi, Osaka (72) Inventor Taizo Imoto Higashi-Osaka, Osaka 6-2-6 Iwatacho, Ichikawa-shi (72) Kazuya Iwasaki 1-5-15-103, Harayamadai, Sakai-shi, Osaka (72) Masato Akahori 2-6-33 Edobori, Nishi-ku, Osaka Within EC (72) Inventor Mikio Kusaka 1605-1, Oshima-cho, Nishisonogi-gun, Nagasaki Prefecture Inside Oshima Shipyard (72) Inventor Hirokazu Nagatomi 1605-1, Oshima-cho, Nishisonogi-gun, Nagasaki Prefecture Inside Oshima Shipyard (72) Inventor Naoya Zaitsu 1605-1, Oshima-cho, Nishisonogi-gun, Nagasaki Prefecture Inside Oshima Shipbuilding Co., Ltd. (72) Inventor Takuro Shibuya 1605-1, Oshima-cho, Nishisonogi-gun, Nagasaki Prefecture Oshima Shipbuilding Co., Ltd. (72) Inventor Tohru Taka Nara Prefecture 6-11-30 Tezukayama, Nara

Claims (1)

[Claims] In a dust collector in which a plurality of bag filters, which are a dust collecting bag as a system of a combustion furnace or a combustion furnace and a waste heat recovery system thereof, are mounted in an inverted manner, an opening of each bag filter is provided. A soot removal structure for a dust collector, wherein a shielding plate for sequentially closing the filter is rotatably attached to an opening end of the filter attachment portion.