JP3598950B2 - Method and apparatus for treating shellfish recovered from intake channel of thermal power plant - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to washing and separation of shellfish, and in a thermal power plant, deodorizing and lowering salt content of shells by washing and separating shellfish collected from a seawater intake channel into shells and organic substances such as shellfish with acidic equipment washing drainage. The present invention relates to a method for treating shellfish to obtain a good cement raw material and the like.
[0002]
Problems to be solved by the prior art and the invention
Conventionally, in thermal power plants, seawater is introduced and used through the intake channel as cooling water for the condenser of the power generation facility, but shells such as mussels and barnacles grow and adhere to the bottom side of the channel, and the water flow resistance is reduced. The shellfish must be peeled and removed on a regular basis in order to increase the number of shells or cause problems such as shells that have flowed off after being partially peeled off and clogged with cooling pipes of the power plant. The annual amount of shellfish removed from this intake channel reaches hundreds of tons at a thermal power plant, and a large amount of shellfish is removed. Most of the removed shellfish were landfilled or incinerated to turn them into resources.However, in recent years, the revision of the Waste Disposal and Public Cleansing Law has strengthened the structure of the landfill disposal site, which has become an issue. I'm familiar.
[0003]
On the other hand, recently, it has been considered that the shellfish can be effectively used as a concrete material (cement raw material, admixture, aggregate) in the construction and civil engineering fields. Since rusting is promoted, the development of low-salt differentiation technology for shellfish used as a raw material for cement and concrete has been an issue.
[0004]
[Means for Solving the Problems]
In view of the above circumstances, the present inventors have conducted intensive research to promote the effective use of shellfish attached to the intake channel of a thermal power plant, to make the shell odorless, and to provide cement raw materials and the like by low salt differentiation. The present invention has been made.
(1) Spray the shellfish recovered from the intake channel of the thermal power plant with acidic cleaning wastewater, which is the cleaning wastewater of the air preheater or electric precipitator of the thermal power plant equipment, to convert it into organic matter such as shells and shell meat. A method for treating shellfish recovered from an intake channel of a thermal power plant, comprising washing and separating.
(2) The shellfish collected from the thermal power plant intake channel is placed on a vibrating screen in a multi-stage arrangement, and the acid washing wastewater, which is the washing wastewater for the air preheater or electric precipitator of the thermal power plant equipment, is placed on top of it. A method for treating shellfish recovered from an intake channel of a thermal power plant, wherein the shellfish is sprayed and washed and separated into shells and organic matter such as shellfish.
(3) Multi-stage vibrating screen for placing shells recovered from the intake channel of the thermal power plant, and from above the acid cleaning drainage, which is the cleaning drainage of the air preheater or electric precipitator of the thermal power plant equipment And a showering device for washing and separating shellfish into shells and organic matter such as shellfish by sprinkling acidic washing wastewater, comprising a showering device for spraying water. Processing equipment for shellfish collected from Japan.
(4) A shellfish washing / separation device for washing and separating shellfish into organic matter such as shells and shellfish by sprinkling of acidic washing wastewater, consisting of a vibrating screen arranged vertically in multiple stages and a showering device equipped with a spray nozzle 4. The apparatus for treating shellfish collected from the intake channel of a thermal power plant according to the above item 3, wherein
(5) Shellfish recovered from the intake channel of a thermal power plant as described in (3) or (4) above, wherein the vibrating screen having a vertically arranged multistage is capable of vibrating in a horizontal direction and in a vertical direction. Processing equipment.
(6) The shellfish collected from the intake channel of a thermal power plant according to any one of (3) to (5) above, wherein the showering device is provided with a spray nozzle capable of changing and adjusting a watering direction. Processing equipment.
(7) A water receiving tank is provided in front of the shellfish washing / separating device to which a mixed solution containing shellfish, muddy water and seawater recovered from the intake channel is supplied, and the water receiving tank is provided with an inclined plate below. 7. The apparatus for treating shellfish collected from the intake channel of a thermal power plant according to any one of the above items 3 to 6, wherein
(8) The intake channel for a thermal power plant according to any one of (3) to (7) above, wherein a washing drainage receiving tank is disposed below the shellfish washing / separating apparatus, and an overflow pipe is attached to the receiving tank. Processing equipment for shellfish collected from Japan.
[0005]
The acidic washing wastewater discharged from the thermal power plant used in the present invention is a washing wastewater discharged by washing an air preheater or an electric dust collector of the thermal power plant equipment with water, and is acidic (pH: In (2) to (3), it mainly contains Fe and a carbon element as metal components, and also contains trace amounts of Na, Mg, Ca, Al, Si, V, Ni, and the like.
Conventionally, the acidic washing wastewater is discharged through a wastewater treatment device after being subjected to neutralization treatment and solid-liquid separation treatment.
In addition, the washing and separating apparatus of the present invention comprises a vibrating screen and a showering apparatus (a number of spray nozzles are arranged in a spray pipe in a manner that can be adjusted in accordance with the direction of water spray) in a multi-stage arrangement in accordance with the throughput and processing speed of shellfish. ) Can be appropriately adjusted for use.
In addition, the inclined plate provided in the lower part of the water receiving tank in the present invention preferably has an inclination angle of 16 °, but an inclination angle that matches the processing amount of a mixed solution containing shellfish, muddy water and seawater can be used. In addition, the present invention can be used in establishments other than thermal power plants that can obtain acidic washing wastewater.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a method for washing and separating shellfish of the present invention, and FIG. 2 is a conceptual diagram of a shellfish processing apparatus of the present invention.
FIG. 3 is a perspective explanatory view of a washing and separating apparatus for shellfish, and FIG. 4 is an explanatory sectional view of a spray pipe and a spray nozzle provided in a showering device of the washing and separating apparatus. FIG. 5 shows a perspective explanatory view of the water receiving tank.
In the schematic process of the present invention, as shown in FIG. 1, shellfish 1 that is periodically deprived and collected from a thermal power plant is supplied to a water receiving tank 2. From the water receiving tank 2, the water is transferred to the shellfish washing / separating device 4 by a transfer pump (for example, a concrete pump) 3.
Next, the shellfish conveyed to the shellfish washing / separating device 4 is supplied to a vibrating screen 5 having a vertically arranged multi-stage arrangement, from which the acidic washing wastewater A according to the present invention is sprinkled (showerling), and shells, shellfish, etc. Organic matter (including mud and fine shellfish). The washed and separated shells are then conveyed and dehydrated by a conveyor (screw type) 6 and then bagged and used as a good cement raw material such as quicklime (CaO) and slaked lime (Ca (OH2)).
[0007]
On the other hand, the separated shell meat and the like and the organic matter (including mud and fine shellfish) are stored in the washing and drainage receiving tank D, and the shell meat and the like floating there are once collected in the collecting tank F by the overflow pipe E and then pumped by the pump H. The water is returned to the drainage storage tank B, and is processed in the drainage storage tank B (BOD and COD reduction processing). Further, the acidic washing wastewater A is introduced into the wastewater storage tank B.
[0008]
The acidic washing wastewater A is obtained when the equipment is washed with fresh water at the time of periodic inspection of an air preheater or an electric dust collector of a thermal power plant, and is acidic (pH: 2-3) as a metal component. It mainly contains Fe and carbon elements, and also contains trace amounts of Na, Mg, Ca, Al, Si, V, Ni and the like. The acidic washing wastewater A in the wastewater storage tank B is sprinkled with shellfish in the washing / separation device 4 to deodorize alkaline malodorous substances such as ammonia generated from shellfish and the like by a neutralization reaction and to remove salt attached to the shell surface. Plays the role of removal.
[0009]
As shown in FIG. 3, the washing / separating device 4 is configured by combining a vibrating screen 5 (5a, 5b) in which upper and lower shells are placed and a showering device C in multiple stages. Further, the vibrating screens 5 (5a, 5b) arranged in the vertical and multi-stage arrangement enable horizontal vibration and vertical vibration (for example, total amplitude: about 11 mm).
It is also preferable to employ a vibrating screen plate (stainless steel punching metal: 3.13φ) having a sieve action as the screen 5.
The number of stages, amplitude, and sieve diameter of the vibrating screen 5 can be selected and used according to the processing of shellfish. As for the showering device C, as shown in FIG. 4, a spray pipe 7 ((A) to (C)) capable of appropriately changing and adjusting a watering direction and a watering amount / pressure at a position above the vibrating screen plate 5. 7a, 7b, 7c) and a number of spray nozzles 8 (8a, 8b, 8c).
By slightly rotating the spray pipes 7a to 7c, the directions of some or all of the many spray nozzles 8a to 8c are inclined downward or downward to the right or left, and from the nozzles 8a to 8c. By transporting the shells simultaneously with washing by ejecting the acidic wastewater A obliquely downward, for example, by slightly rotating the spray pipe 7b of (B) to the left and turning the nozzle 8b downward and to the right, the transport provided on the right It can move (transfer) in the direction of the conveyor 6.
The spray nozzles 8a, 8b,... Are arranged in accordance with the amount of shellfish to be treated, and the number and direction of water spray are adjusted.
[0010]
The shellfish sent by the transport pump 3 is placed on a vibrating screen 5 having a vertically arranged multi-stage arrangement, and a vibrating and sieving action is applied to the shellfish, and a shower ring provided with a spray pipe 7 and a number of spray nozzles 8 from above. The acid washing wastewater A is continuously sprinkled by the device C, and the shells are uniformly washed while imparting up and down movement, reversal of left and right movement, etc. to the shells and giving a movement to dance. And low-salinization of the shell.
Further, by the detachment of the shell meat adhering to the shell, the shell is washed and separated into organic substances (mud, fine shellfish, etc.) such as shell.
[0011]
On the other hand, as shown in FIG. 5, a mixed solution containing the shellfish 1, muddy water and seawater collected from the intake channel is supplied. The water receiving tank 2 is covered with a scattering prevention plate 9 and an inclined plate 10 (inclination angle: 10 to 20 °, preferably about 16 °: made of steel plate) for moving shellfish by its own weight is provided below the plate. The angle and the material of the inclined plate 10 are changed according to the processing amount and the transport speed of the shellfish.
[0012]
Next, as shown in FIG. 1, the washed wastewater containing organic substances (including mud and fine shellfish) such as shellfish washed and separated in the shellfish washing / separating apparatus 4 is disposed at the lower part of the washing / separating apparatus 4. After being stored in the washed and drained wastewater receiving tank D, the supernatant suspended material such as shellfish is temporarily collected in the collecting tank F through the overflow pipe E by the overflow pipe E attached to the upper part of the receiving drainage tank D (water collecting tank). Is recovered by the pump H and returned to the drainage storage tank B to be reused as the acidic washing wastewater A.
[0013]
In the drainage storage tank B, biological treatment (reduction of COD and BOD) is performed by air bombardment, and the lower layer liquid is sludge treated by the coagulation sedimentation treatment apparatus I (condensation tank, coagulation sedimentation tank, and concentration tank). Is separated and then dewatered, and the solids are bagged and used as a good cement material. The wastewater separated by the coagulation-sedimentation treatment apparatus I is discharged to a sewage treatment plant.
[0014]
According to the present invention, for the washing and separation of the shellfish having a strong putrefaction odor as described above, the acidic Fe component / carbon (unfueled carbon) generated by washing the air preheater or the electric dust collector with fresh water. The acid of the acidic washing wastewater A of equipment containing minute amounts and trace amounts of other metals, etc., suppresses the alkaline malodorous substances such as ammonia generated from shellfish and the like contained in the shellfish by a neutralization reaction. Further, Fe, carbon (unburned carbon) and a trace amount of other metal elements act as a catalyst or an active substance for promoting the chemical reaction, and further enhance the deodorizing effect.
[0015]
On the other hand, the washing / separating device 4 cleans the shells of the shellfish and the organic matter such as shellfish by the vibrating screen 5 for sieving the shellfish and reversing the vertical and horizontal movements and spraying water with the spray nozzle 8 (showerling device C). Washing of the shell and separation of the shell from organic substances such as shell meat are performed well by combining the separation with the transporting action of the shell, thereby promoting low salinization (desalting) of the shell. As a result, the obtained shell can be used as a good cement raw material.
[0016]
【The invention's effect】
As described above, according to the present invention, the following excellent effects can be obtained.
(1) Eliminating the conventional landfill disposal or incineration of large quantities of raw shellfish recovered from intake channels in conventional thermal power plants to convert them into resources, and the shellfish washing and separation method according to the present invention enables shellfish to be used as a cement raw material. As a result, the problem of securing a landfill site is eliminated, and the occurrence of pollution problems such as bad smell is greatly reduced.
(2) In the washing and separating process of shellfish, a washing and separating device provided with a spray nozzle (shower ring) and a vibrating screen is used by utilizing the acidic washing water discharged from the washing of the thermal power plant equipment. Thereby, the bad odor generated from the shellfish can be significantly suppressed. At the same time, the shell can be differentiated with low salt, and a good cement raw material can be obtained.
(3) The provision of the inclined plate in the water receiving tank, which is a pretreatment step for shellfish, facilitated the pretreatment of shellfish, and also greatly reduced equipment costs and management costs.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a method for washing and separating shellfish of the present invention.
FIG. 2 shows a conceptual diagram of a shellfish processing apparatus of the present invention.
FIG. 3 is a perspective explanatory view of a washing and separating apparatus for shellfish.
FIG. 4 is an explanatory sectional view of a spray pipe and a spray nozzle provided in a showering device of the washing / separating device shown in FIG. 3;
FIG. 5 shows a perspective explanatory view of a water receiving tank.
[Explanation of symbols]
A Acid washing drainage of air preheater / electric precipitator B Drainage storage tank C Shower ring device D Washing drainage receiving tank E Overflow pipe F Recovery tank G Water collecting tank H Pump I Coagulation sedimentation treatment equipment J Dehydration treatment 1 Dewatering treatment 1 Shellfish 2 Water receiving tank 3 Transport pump (concrete pump)
Reference Signs List 4 Washing / separating device 5 Vibrating screen 6 Conveyor 7 (7a, 7b, 7c) Spray tube 8 (8a, 8b, 8c) Spray nozzle 9 Shatterproof plate 10 Inclined plate

Claims (8)

The shellfish collected from the thermal power plant intake channel is sprinkled with acidic cleaning wastewater, which is the cleaning wastewater of the air preheater or electric precipitator of the thermal power plant, to wash and separate it into organic matter such as shells and shell meat. A method for treating shellfish collected from an intake channel of a thermal power plant. The shellfish collected from the thermal power plant intake channel is placed on a vibrating screen with a multi-tiered arrangement of upper and lower parts. A method for treating shellfish recovered from an intake channel of a thermal power plant, wherein the shellfish is separated into organic substances such as shells and shell meat. Sprinkling acidic washing wastewater, which is the washing wastewater of the air preheater or electric precipitator of the thermal power plant equipment, from above and below the vibrating screen of multi-stage arrangement for placing the shellfish collected from the intake channel of the thermal power plant A shellfish washing / separation device for washing and separating shellfish into shells and organic matter such as shellfish by sprinkling of acidic washing wastewater, which is composed of a showering device, is collected from a thermal power plant intake channel. Shellfish processing equipment. A shellfish washing / separation device for washing and separating shellfish into shells and organic matter such as shellfish by sprinkling acidic washing wastewater shall consist of a vertically arranged multi-stage vibrating screen and a showering device equipped with a spray nozzle. The apparatus for treating shellfish collected from the intake channel of a thermal power plant according to claim 3. The apparatus for treating shellfish collected from a thermal power plant intake channel according to claim 3 or 4, wherein the vibrating screens arranged in a vertically arranged multistage are capable of vibrating in a horizontal direction and in a vertical direction. . The treatment of shellfish collected from the thermal power plant intake channel according to any one of claims 3 to 5, wherein the showering device is provided with a spray nozzle capable of changing and adjusting a watering direction. apparatus. A water receiving tank for supplying a mixed liquid containing shellfish, muddy water, and seawater collected from the intake channel is provided in front of the shellfish washing / separating apparatus, and the water receiving tank is provided with an inclined plate below the water receiving tank. An apparatus for treating shellfish collected from an intake channel of a thermal power plant according to any one of claims 3 to 6, characterized in that: The recovery from the thermal power plant intake channel according to any one of claims 3 to 7, wherein a washing drainage receiving tank is arranged at a lower part of the shellfish washing and separating apparatus, and an overflow pipe is attached to the receiving tank. Shellfish processing equipment.

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