JPH0493510A - Exhaust gas treatment equipment for marine life incineration treatment equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is aimed at removing shellfish and seaweeds attached to the screens of seawater intakes and walls of seawater intake channels of power plants, or sludge containing seaweeds near the screens. The present invention relates to an exhaust gas treatment device in a marine life incineration treatment device that collects and incinerates marine life.

[Conventional technology]

Conventionally, when incinerating sea creatures collected near the seawater intake of a power plant, as shown in FIG. At the same time, cleaning water is supplied into the trommel 15, and the trommel 1
The shellfish that did not pass through the net 5 are supplied to a storage tank 17 by a conveyor 16, and the shellfish in the storage tank 17 are then passed through a hood 19 by a screw conveyor 18 to the base end of a countercurrent rotary kiln 20. A flame is injected toward the middle side of the rotary kiln 20 from a burner 21 provided at the tip of the rotary kiln 20, and the shellfish moving from the base end of the rotary kiln 20 toward the tip is controlled by the burner 21. It is heated and incinerated.

Further, a hood 22 is connected to the tip of the rotary kiln 20.
The incineration residue discharged through the rotary cooler 24 is supplied to the base end in a rotary cooler 24 having a water sprinkler 23 at the top, and is passed through the hood 25 from the tip of the rotary cooler. Screw conveyor26. The incineration residue transferred through the conveyor 27 is stored in a quicklime hopper 28.
After the incineration residue containing a large amount of quicklime discharged by the screw conveyor 29 is sequentially passed through the digester 30 and the cramming machine 31, it is supplied to the slaked lime hopper 33 by the conveyor 32, and the slaked lime in the slaked lime hopper 33 is removed as necessary. is discharged by a screw conveyor 34.

Also, a muddy water tank 35 provided at the bottom of the trommel 15
The muddy water inside is supplied to the stirring tank 37 by the pump 36, and a flocculant (PAC 2 part name) is added to the muddy water in the stirring tank 37, and the mixture is sequentially stirred by the high-speed stirrer 38 and the low-speed stirrer 39. The overflow water from the stirring tank 37 is transferred to the settling tank 40.
The overflow water from the settling tank 40 is treated and discharged by the activated sludge treatment device 4], and then the overflow water from the settling tank 40 is treated and discharged.
The sludge discharged from the lower part of the rotary separator 42 by the pump 42 is supplied to the rotary separator 43, the sludge discharged from the rotary separator 43 is supplied to the storage tank 17, and the water discharged from the rotary separator 43 is The mixture is refluxed to the stirring tank 37.

Further, the gas discharged from the upper part of the hood 19 provided at the base end of the rotary kiln 20 is supplied to a deodorizing incinerator 45 equipped with a burner 44, and the gas discharged from the deodorizing incinerator 45 is supplied to a water sprinkler. The air is introduced into an electrostatic precipitator 48 through an abatement tower 47 having an air purifier 46, and then discharged from a chimney 50 by a blower 49.

In addition, slaked lime powder is supplied from the slaked lime powder tank 51 into the water tank 53 by the screw conveyor 52, and
Water is supplied into the water tank 53, and water containing slaked lime powder in the water tank is pumped through the water sprinkler 46 by the pump 54.
and further to the lower part of the hood 19 and the deodorizing combustion furnace 45. Moisture and solid matter discharged from the lower part of the abatement tower 47 and the electrostatic precipitator 48 are supplied to the quicklime hopper 28, and the water discharged from the water receiving tank 55 at the lower part of the rotary cooler 24 is supplied to the Gooling tower 56 and the pump 57. The water is then circulated to the water sprinkler 23.

[Problem to be solved by the invention]

In the case of the conventional marine life incineration treatment device, the slaked lime stored in the slaked lime hopper 33 contains salt (NaC1), so the slaked lime cannot be used as a soil reforming material etc. There are problems in that the equipment is complicated and the equipment costs are high, and the equipment is also large.

The object of the present invention is to provide an exhaust gas treatment device for a marine life incineration treatment device that can advantageously solve the above-mentioned problems.

[Means to solve the problem]

In order to achieve the above object, in the exhaust gas treatment device for the marine life incinerator of the present invention, the incineration residue outlet at the lower part of the exhaust hood 2 surrounding the incineration residue outlet of the rotary kiln 1 for marine life incineration is connected to the incineration residue outlet of the marine life incineration apparatus. The upper gas outlet of the exhaust hood 2 is connected to the gas inlet of the abatement tower 6 which is disposed in the water of a water seal tank 4 having a water sealing tank 4 and has a water sprinkler 5 on the upper part, and the water sprinkler 5 contains alkaline content. A drain pipe 8 of the water seal tank 4 is connected to a water supply pipe 7 that supplies water.

In addition, in order to store the incineration residue from the digestion process, which contains almost no salt, in the digestion residue storage hopper 11, the gas outlet of the abatement tower 6 is connected to an electrostatic precipitator to collect the salt generated from the marine life incineration equipment as dust. The collected dust outlet of the abatement tower 6 and the electrostatic precipitator 9 is connected to the gas inlet of the conveyor 7.
5.76 to the dust collection dust hopper 77.

〔Example〕

Next, the invention will be explained 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 and having a refractory layer 58 inside has a gentle slope where the tip end is lower than the base end, e.g. The rotary kiln 1 is arranged at a slope of 1.5/100, and is rotatably supported by rollers 59, and a drive gear 62 of a drive device 61 is meshed with an annular driven gear 60 fixed to the rotary kiln 1.

A screw conveyor 14 is provided at the bottom of a marine life tank 12 containing marine life 13 consisting of shellfish and seaweed sludge, and the upper end of a marine life supply pipe 63 is connected to the delivery end of the screw conveyor 14. Biological supply pipe 63
The lower end opening of the burner 66 is disposed near the center of the base end in the rotary kiln 1 and is equipped with a heavy oil supply pipe 64 and an air supply pipe 65 surrounding it. A blowing port 68 is disposed near the marine life supply pipe 63 at the end thereof, and is further provided at the tip of the secondary air blowing pipe 67 for blowing secondary air along the lower inner surface of the base end of the rotary kiln 1. It is being

A range (corresponding to the length of the flame 69 of the burner 66) is provided on the inner surface of the base end side of the refractory material layer 58 in the rotary kiln 1.
For example, a truncated conical surface 70 whose inner diameter gradually increases from the base end to the middle part of the rotary kiln 1 is formed over a length of about 2 m), and the slope β of this truncated conical surface is, for example, 1.
The incineration residue outlet at the bottom of the discharge hood 2, which is set to 5/100 and surrounds the tip (incineration residue outlet) of the rotary kiln 1, is placed in water in a water sealing tank 4, and in the water sealing tank 4, A residue discharge device 3 consisting of a rake conveyor is provided to scrape up and discharge the incineration residue accumulated at the bottom of the tank.

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 the hopper 1
1 is provided with a screw conveyor 71 for discharging digestion residue as necessary, and the gas outlet at the upper part of the discharge hood 2 is connected to the gas inlet at the upper part of the abatement tower 6 which has a water sprinkler 5 at the upper part. A drain pipe 8 connected to the water seal tank 4 and an industrial water supply pipe 72 are connected to the water supply pipe 7 which is connected to supply water containing alkaline content to the water sprinkler 5, and a pump is connected to the drain pipe 8. 73 is provided, and the water sealing tank 4 is continuously or intermittently supplied with industrial water.

A screw conveyor 52 for supplying slaked lime powder into a water tank 53 is provided at the bottom of the slaked lime powder tank 51, and the water tank 53 is continuously or intermittently replenished with industrial water. Water containing slaked lime powder is continuously or intermittently supplied to the water supply pipe 7 by a pump 54.

The gas outlet of the abatement tower 6 is connected to the gas inlet of an electrostatic precipitator 9, and the gas outlet of the electrostatic precipitator 9 is connected to a chimney 50 via a blower 49, and a dust discharger provided at the bottom of the electrostatic precipitator 9 is connected to the gas outlet of the electrostatic precipitator 9. The screw conveyor 74 and the dust outlet of the abatement tower 6 are connected to a dust hopper 77 via conveyors 75 and 76.
A discharge screw conveyor 78 having a humidifying water adding section is provided at the lower part of the humidifying water adding section.

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

The marine life supplied from the marine life tank 12 to the rotary kiln 1 through the screw conveyor 14 and the marine life supply pipe 63 is incinerated by the rotary kiln 1,
The incineration residue discharged from the rotary kiln 1 passes through the discharge hood 2 and falls 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 scraped by the residue discharge device 3. While being raised and drained, digestion continues even after draining, and the digested incineration residue is stored in the digestion residue storage hopper 11.

Further, the harmful gases discharged from the rotary kiln 1 are supplied into the abatement tower 6 through the drainage hood 2 and are subjected to abatement treatment.

The water in the water seal tank 4 becomes salty (Na) as the operating time passes.
The soluble salts mainly composed of C1) and fine colloidal suspended matter gradually become concentrated. For this purpose, the water seal tank 4 is supplied with industrial water, and the water in the water seal tank 4 is continuously or intermittently discharged by the pump 73, so that the concentration of inclusions in the water in the water seal tank 4 is reduced. It is necessary to manage the situation so that it is below the departmental level.

In addition, the water in the water sealing tank 4 is composed of slaked lime (Ca(OH)2).
Since the water is alkaline, there is no need to treat the water discharged from the water tank 4 before discharging it, and the water can be used as part of the abatement water sprayed from the sprinkler 5 of the abatement tower 6. I can do it. As a result, the alkali in the water discharged from the water sealing layer 4 is used to neutralize the acid gas in the gas discharged from the rotary kiln 1, and the alkali in the water discharged from the water sealing tank 4 is used to neutralize the acid gas in the gas discharged from the rotary kiln 1. The salts, colloidal suspended matter, and dust discharged from the rotary kiln 1 are discharged as dust from the lower part of the abatement tower 6 and the electrostatic precipitator 9.

It goes without saying that the present invention produces exactly the same effect even when the abatement tower 6 is a wet cleaning tower.

If the salt contained in marine organisms is included as a pollutant in the incineration residue, the value of the incineration residue as a soil improvement material will decrease. If marine life is treated by the rotary kiln 1, most of the salt discharged from the rotary kiln 1 will be transferred to the gas treatment system and then collected as dust by the electrostatic precipitator 9, and the incineration residue taken out from the water seal tank 4 will be Since it contains almost no substances, its value as a soil improvement material is significantly improved.

〔Effect of the invention〕

Since this invention is configured as described above, it produces the effects described below.

The marine life incineration residue discharged from the rotary kiln 1 for incinerating marine life passes through the discharge hood 2 and falls into the water in the water seal tank 4 where it is digested. It can be used as a reforming material, and the harmful gas discharged from the rotary kiln 1 is supplied to the abatement tower 6 for abatement treatment, and the water sealing tank 4
Since the water inside is alkaline due to slaked lime, water seal tank 4
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 part of the abatement water sprayed from the water sprinkler 5 of the abatement tower 6, and the alkalinity of the water discharged from the water seal tank 4 can be transferred from the rotary kiln 1. It can be used to neutralize acidic gases in exhausted gas.

Furthermore, the amount of supply 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 seal tank 4.

Furthermore, by connecting the gas outlet of the abatement tower 6 to the electrostatic precipitator 9, the salt discharged from the rotary kiln 1 and the colloidal suspension device contained in the water in the water seal tank 4 can be collected using the electricity. The marine life incineration treatment device that can be collected as dust by the dust collector 9 and has the generated gas treatment device of the present invention has a simple configuration and can be manufactured in a small size and at low cost.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, in which FIG. 1 is a partially vertical side view showing the generated gas treatment device in the marine life incineration treatment device of the present invention, and FIG. 2 is a parallel-flow FIG. FIG. 3 is a partially longitudinal side view of a conventional marine life incineration treatment device. In the figure, 1 is a rotary kiln for incinerating marine life, 2 is a discharge hood, 3 is a residue discharge device, 4 is a water seal tank, 5 is a water sprinkler, 6 is an abatement tower, 7 is a water supply pipe, 8 is a drain pipe, 9 is an electrostatic precipitator, 10 is a conveyor, 11 is a hopper for storing digestion residue,
66 is a burner, 71 is a screw conveyor, 72 is an industrial water supply pipe, 73 is a pump, 74 is a dust discharge screw conveyor, and 77 is a dust hopper.

Claims (2)

[Claims] (1) The incineration residue discharge port at the bottom of the discharge hood 2 surrounding the incineration residue outlet of the rotary kiln 1 for incinerating marine life is placed underwater in a water seal tank 4 having a residue discharge device 3, and has a water sprinkler 5 at the top. The exhaust hood 2 is installed at the gas inlet of the abatement tower 6.
An exhaust gas treatment device in a marine life incineration treatment device, in which a drain pipe 8 of the water seal tank 4 is connected to a water supply pipe 7 that supplies water containing alkaline content to the water sprinkler 5. . (2) The gas outlet of the abatement tower 6 is connected to the gas inlet of the electrostatic precipitator 9, and the collected dust outlet of the abatement tower 6 and the electrostatic precipitator 9 is transferred to the collected dust hopper 77 via conveyors 75 and 76.
The exhaust gas treatment device in a marine life incineration treatment device according to claim 1, wherein the exhaust gas treatment device is connected to a marine life incineration treatment device.