JP2759703B2 - Exhaust gas treatment equipment for marine incineration equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to shells and seaweeds attached to a screen of a seawater intake of a power plant and a wall surface of a seawater intake channel, or sludge containing seaweed near the screen. The present invention relates to an exhaust gas treatment device in a marine incineration apparatus that collects and incinerates marine life.

[Conventional technology]

Conventionally, when incinerating marine organisms collected from near the seawater intake of a power plant, as shown in FIG. 3, the marine organisms 13 in the marine organism tank 12 are transferred to a trommel 15 via a screw conveyor 14 and a supply pipe. In addition to supplying the washing water into the trommel 15, the shellfish that has not passed through the net of the trommel 15 is supplied to the storage tank 17 by the conveyor 16, and then the shellfish in the storage tank 17 is screwed. The conveyer 18 feeds through a hood 19 to the base end of a counter flow type rotary kiln 20, and injects a flame from a burner 21 provided at the tip end of the rotary kiln 20 toward an intermediate side of the rotary kiln 20, thereby forming the rotary kiln 20. Shellfish moving from the base end to the tip end of the burner.
Heated by 21 and incinerated.

Further, the incineration residue discharged from the tip of the rotary kiln 20 through the hood 22 is supplied to a base end in a rotary cooler 34 having a sprinkler 23 at an upper portion, and the hood 25 and the screw are fed from the tip of the rotary cooler. Conveyor 26,
The incineration residue transferred through the conveyor 27 is stored in the quick lime hopper 28, and the incineration residue containing a large amount of quick lime discharged from the quick lime hopper 28 by the screw conveyor 29 is sequentially passed to the digester 30 and the jukuseiki 31. After that, conveyor 32
The slaked lime in the slaked lime hopper 33 is discharged by the screw conveyor 34 as needed.

The muddy water in a muddy water tank 35 provided at the lower part of the trommel 15 is supplied to a stirring tank 37 by a pump 36, and a flocculant (PAC: trade name) is added to the muddy water in the stirring tank 37 to perform high-speed stirring. The overflow water in the stirring tank 37 is supplied to the sedimentation tank 40, and the overflow water from the sedimentation tank 40 is treated and discharged by the activated sludge treatment device 41. The sludge discharged from the lower part of the sedimentation tank 40 by the pump 42 is supplied to the rotary separator 43, and the sludge discharged from the rotary separator 43 is supplied to the storage tank 17 and discharged from the rotary separator 43. The collected water is returned to the stirring tank 37.

A hood provided at the base end of the rotary kiln 20;
The gas discharged from the upper part of 19 is supplied to a deodorization incinerator 45 provided with a burner 44, and the gas discharged from the deodorization incinerator 45 is passed through a detoxification tower 47 having a water sprinkler 46 to an electric precipitator.
The air is then discharged from a chimney 50 by a blower 49.

Further, slaked lime powder is supplied from a slaked lime powder tank 51 into a water tank 53 by a screw conveyor 52, water is supplied into the water tank 53, and the slaked lime powder-containing water in the water tank is pumped by the pump 54 into the sprinkler. Supply to 46,
Further, the lower part of the hood 19, the deodorization incinerator 45, and the detoxification tower 4
7, supplying the water and solid matter discharged from the lower part of the electric dust collector 48 to the quicklime hopper 28, and the water discharged from the water receiving tank 55 at the lower part of the rotary cooler 24 to a cooling tower.
The water is circulated to the sprinkler 23 via 56 and the pump 57.

[Problems to be solved by the invention]

In the case of the above-mentioned conventional marine incineration apparatus, slaked lime stored in the slaked lime hopper 33 contains salt (NaCl), so that the slaked lime cannot be used as a soil modifying material or the like. Is complicated and the equipment cost is high,
There is a problem that the equipment becomes large.

SUMMARY OF THE INVENTION An object of the present invention is to provide an exhaust gas treatment apparatus for a marine incineration apparatus that can advantageously solve the above-mentioned problem.

[Means for solving the problem]

In order to achieve the above object, in an exhaust gas treatment apparatus for a marine incineration apparatus according to the present invention, a discharge hood 2 surrounding an incineration residue discharge port of a marine incineration rotary kiln 1 is provided.
Is disposed in the water of a water sealing tank 4 having a residue discharging device 3, and a gas outlet of an upper part of the discharge hood 2 is connected to a gas inlet of an abatement tower 6 having a sprinkler 5 at an upper part. A drain pipe 8 of the water seal tank 4 is connected to a water supply pipe 7 which is connected and supplies water containing alkali to the sprinkler 5.

Further, in order to store the digestion incineration residue containing almost no salt in the digestion residue storage hopper 11, the gas outlet of the detoxification tower 6 is connected to an electric precipitator for the purpose of collecting salt generated from the marine incineration apparatus as dust. 9 is connected to the gas inlet of the abatement tower 6 and the collection dust outlet of the dust collector 9 is connected to the conveyor 7.
It connects to the dust collecting hopper 77 via 5,76.

〔Example〕

 Next, the present invention will be described in detail with reference to illustrated examples.

FIGS. 1 and 2 show an embodiment of the present invention, in which a rotary kiln 1 having a circular cross section having a refractory material layer 58 inside has a gentle slope in which a tip portion is lower than a base portion, for example, α =. The rotary kiln 1 is arranged at a gradient of 1.5 / 100, and is rotatably supported by rollers 59. A driving gear 62 of a driving device 61 is meshed with an annular driven gear 60 fixed to the rotary kiln 1.

A screw conveyor 14 is provided at a lower portion of a marine organism tank 12 containing marine organisms 13 composed of shellfish and seagrass-containing sludge, and an upper end of a marine organism supply pipe 63 is connected to a delivery end of the screw conveyor 14, and the marine organism supply pipe 63 is connected thereto. The lower end opening of the biological supply pipe 63 is disposed near the center of the base end of the rotary kiln 1 and has a heavy oil supply pipe 64 and an air supply pipe 65 surrounding the same.
The burner 66 injection port provided with the following is disposed near the marine organism supply pipe 63 at the base end in the rotary kiln 1, and further, at the tip of the secondary air suction pipe 67, at the base end of the rotary kiln 1. A suction port 68 for sucking in secondary air is provided along the lower inner surface of the airbag.

The inside diameter of the rotary kiln 1 gradually increases from the base end to the middle of the rotary kiln 1 over the range (for example, about 2 m) corresponding to the length of the flame 69 of the burner 66 on the base inner surface of the refractory material layer 58. A frusto-conical surface 70 is formed. The slope β of the frusto-conical surface is set to, for example, 1.5 / 100, and the incineration residue discharge at the lower portion of the discharge hood 2 surrounding the tip (incineration residue outlet) of the rotary kiln 1 is formed. The outlet is disposed in the water of a water sealing tank 4, and in the water sealing tank 4, a residue discharge device 3 composed of a rake conveyor for scraping up and discharging the incineration residue deposited at the bottom of the tank is provided.

The digestion residue discharge port of the water seal tank 4 and the digestion residue storage hopper 11 are connected via a conveyor 10, and a screw conveyor 71 for discharging the digestion residue is provided below the hopper 11 as necessary. A gas outlet at an upper part of the discharge hood 2 is connected to a gas inlet at an upper part of an abatement tower 6 having a water sprinkler 5 at an upper part, and a supply pipe 7 for supplying water containing an alkali to the water sprinkler 5, A drain pipe 8 connected to the water sealing tank 4 is connected to an industrial supply pipe 72, a pump 73 is provided in the drain pipe 8, and industrial water is supplied to the water sealing tank 4 continuously or intermittently. Is done. A screw conveyor 52 for supplying slaked lime powder into the water tank 53 is provided below the slaked lime powder tank 51, and the water tank 53 is supplied with industrial water continuously or intermittently. The water content of the slaked lime powder inside is supplied to the water supply pipe 7 continuously or intermittently by a pump 54.

The gas outlet of the abatement tower 6 is connected to the gas inlet of the electric precipitator 9, the gas outlet of the electric precipitator 9 is connected to the chimney 50 via the blower 49, and the dust discharge provided at the lower part of the electric precipitator 9. Screw conveyor 74 and the dust discharge port of the abatement tower 6 are connected to a dust hopper 77 via conveyors 75 and 76, and a discharge screw conveyor 78 having a humidification water adding section is provided below the dust hopper 77. ing.

 Next, the operation of the apparatus of the above embodiment will be described.

The sea life supplied to the rotary kiln 1 from the sea life tank 12 through the screw conveyor 14 and the sea life supply pipe 63 is incinerated by the rotary kiln 1, and the incineration residue discharged from the rotary kiln 1 passes through the discharge hood 2. The water is dropped into the water in the water seal tank 4 to be digested, and the incineration residue in the water in the water seal tank 4 is discharged to the residue discharge device 3.
As a result, the digestion proceeds, and the digested incineration residue is stored in the digestion residue storage hopper 11.

The harmful gas discharged from the rotary kiln 1 is
It is supplied to the abatement tower 6 through the discharge hood 2 and is subjected to the elimination processing.

The water in the water-sealed tank 4 becomes salty (Na C
The soluble salts mainly composed of l) and fine colloidal suspended substances gradually become concentrated. For this purpose, industrial water is supplied into the water seal tank 4 and the water in the water seal tank 4 is continuously or intermittently discharged by the pump 73 so that the concentration of the inclusions in the water in the water seal tank 4 is reduced. It is necessary to manage it below a certain level.

Further, marine organisms 13 such as shellfish mainly composed of calcareous calcium carbonate are decarburized from the calcium carbonate by incineration to become quick lime (CaO), and the quick calcified incineration residue is used as a discharge hood to discharge hood. When it comes into contact with water in the water sealing tank 4, the incineration residue undergoes a digestive reaction and becomes slaked lime. For this reason, the water in the water sealing tank 4 is made of slaked lime (Ca
Since it is alkylated by (OH) ₂ ), it is not necessary to treat the water discharged from the water sealing tank 4 before discharging it, and the water for abatement is sprayed from the sprinkler 5 of the abatement tower 6. Can be used as part. As a result, the alkali of the water discharged from the water sealing tank 4 is used for neutralizing the acidic gas in the gas discharged from the rotary kiln 1, and the alkali contained in the water discharged from the water sealing tank 4 is dissolved. The volatile salt, colloidal suspended solids, and dust discharged from the rotary kiln 1 are discharged as dust from the abatement tower 6 and the lower part of the electrostatic precipitator 9.

In the present invention, it goes without saying that the same effect is obtained even when the abatement tower 6 is a wet washing tower.

If the salt contained in marine organisms is included as sludge material in the incineration residue, the incineration residue will have a reduced value as a soil modifying material. Most of the salt discharged from the rotary kiln 1 is transferred to the gas treatment system and then collected as dust by the electric dust collector 9, and the incineration residue taken out from the water sealing tank 4 is converted into salt. Almost no, the value as a soil modifying material is significantly improved.

〔The invention's effect〕

Since the present invention is configured as described above, the following effects can be obtained.

The marine incineration residue discharged from the marine incineration rotary kiln 1 falls into the water in the water seal tank 4 through the discharge hood 2 and is digested, and the digested marine incineration residue is removed from the soil. Can be used as a modifier,
The harmful image discharged from the rotary kiln 1 is supplied to a harm removal tower 6 for harm removal treatment, and
Since the water inside is alkaline due to slaked lime,
There is no need to treat the water drained from inside before releasing it.
The water discharged from the water seal tank 4 can be used as a part of the water for abatement sprayed from the sprinkler 5 of the abatement tower 6, and the alkalinity of the water discharged from the water seal tank 4 is converted from the rotary kiln 1. It can be used for neutralizing acid gas in the discharged gas.

Further, the supply amount from the slaked lime slurry supply pump 54 can be reduced by an amount corresponding to the alkali in the water discharged from the water sealing tank 4.

Furthermore, by connecting the gas outlet of the abatement tower 6 to the electric precipitator 9, the salt discharged from the rotary kiln 1 and the colloidal suspension device contained in the water in the water sealing tank 4 are connected to the electric discharger. The dust collector 9 can collect the dust as dust, and the marine incineration processing apparatus having the generated gas processing apparatus of the present invention can be manufactured with a simple configuration, small size and low cost.

[Brief description of the drawings]

FIGS. 1 and 2 show an embodiment of the present invention. FIG. 1 is a partially longitudinal side view showing a generated gas processing apparatus in a marine incineration processing apparatus of the present invention, and FIG. It is a vertical side view of the rotary kiln of a type | mold. FIG. 3 is a partial longitudinal side view of a conventional marine incineration apparatus. In the drawing, 1 is a rotary kiln for incineration of marine organisms, 2 is a discharge hood, 3 is a residue discharge device, 4 is a water seal tank, 5 is a sprinkler, 6 is a detoxification tower, 7 is a water supply pipe, 8 is a drain pipe, 9 Is an electric dust collector, 10 is a conveyor, 11 is a hopper for storing digestion residues, 66 is a burner, 71 is a screw conveyor, 72 is an industrial water supply pipe, 73 is a pump, 74 is a screw conveyor for dust discharge, and 77 is a dust hopper.

Continued on the front page (51) Int.Cl. ⁶ Identification code FI F23G 5/20 ZAB F23J 1/02 C 7/00 ZAB B01D 53/34 D F23J 1/02 (72) Inventor Tetsuo Ishikawa Tobata, Kitakyushu-shi, Fukuoka 46-59, Naka-ku, Nippon Steel Plant Design Co., Ltd. (72) Inventor Nobuyuki Uematsu 46-59, Naka-hara, Toba-ku, Kitakyushu-shi, Fukuoka Nippon Steel Corporation Machinery & Plant Business Unit (72) Inventor Yasutaka Nakaya Hyogo 2-6-20 Chidori, Arai-machi, Takasago-shi, Japan Inside Yanagida Sangyo Co., Ltd. (56) References JP 50-27957 (JP, B2) (58) Fields surveyed (Int. Cl. ⁶ , DB name) F23G 7 / 00 F23J 1/02 F23J 15/00 B01D 53/34 B01D 53/18 F23G 5/20 B03C 3/00

Claims (2)

(57) [Claims] An incineration residue discharge port at a lower portion of a discharge hood 2 surrounding an incineration residue outlet of a rotary kiln 1 for incineration of marine organisms,
The gas outlet of the upper part of the discharge hood 2 is connected to the gas inlet of the abatement tower 6 which is disposed in the water seal tank 4 having the residue discharging device 3 and has the sprinkler 5 at the upper part. Water supply pipe 7 for supplying water containing water,
An exhaust gas treatment device in a marine incineration device to which a drainage pipe 8 is connected. 2. A gas outlet of the abatement tower 6 is connected to a gas inlet of the electric precipitator 9, and a collection dust outlet of the abatement tower 6 and the electric precipitator 9 is connected via a conveyor 75, 76 to a dust collecting dust hopper 77.
The exhaust gas treatment device for a marine incineration treatment device according to claim 1, which is connected to the wastewater treatment device.