KR20220145426A - Water treatment apparatus - Google Patents

Abstract

The water treatment apparatus applied to the scrubber which wash|cleans the exhaust gas discharged|emitted from the marine diesel engine with scrubber water WHEREIN: A collecting tank collect|recovers the scrubber water used for washing|cleaning of exhaust gas. The fresh water supply system supplies fresh water to the collecting tank. A circulation system circulates scrubber water from a collecting tank to a scrubber. A foreign material removal system removes the foreign material in the scrubber water extracted from the circulation system, and returns the scrubber water after foreign material removal to a circulation system. The removed foreign material is discharged to the storage tank through the foreign material discharge pipe. The control device controls the flow of the scrubber water so that when the specific gravity measured by the hydrometer is equal to or greater than the reference value, the scrubber water is discharged to the storage tank.

Description

water treatment unit {WATER TREATMENT APPARATUS}

TECHNICAL FIELD The present invention relates to a water treatment device that treats washing water of exhaust gas of a marine diesel engine mounted on a ship.

Conventionally, in the field of a ship, the exhaust gas washing apparatus (scrubber) for washing|cleaning the exhaust gas discharged|emitted from the diesel engine for ships is well-known. In general, a scrubber sprays washing water to exhaust gas, thereby removing foreign substances such as sulfur oxides (SOx) in the exhaust gas and fine particles (PM) such as dust to wash the exhaust gas. Such a scrubber is provided in the exhaust gas recirculation (EGR:Exhaust Gas Recirculation) system which is one method of reducing nitrogen oxides (NOx) in exhaust gas, for example.

An EGR system washes a part of exhaust gas discharged|emitted from the marine diesel engine with a scrubber, mixes this washing|cleaning exhaust gas with air, and recirculates it to the marine diesel engine. Thereby, an EGR system suppresses generation|generation of NOx by combustion of fuel in the combustion chamber of a marine diesel engine, and reduces content of NOx in exhaust gas (namely, the discharge amount of NOx).

On the other hand, water used for cleaning exhaust gas in the scrubber (hereinafter referred to as scrubber water appropriately) is used for cleaning exhaust gas again after cleaning the exhaust gas, while pH adjustment (neutralization) and removal of foreign substances are performed. It is generally used (for example, refer patent documents 1 - 3). For this reason, the water treatment apparatus which performs processes, such as adjustment of these pH and removal of a foreign material, with respect to scrubber water is applied to a scrubber.

Water treatment apparatus WHEREIN: Adjustment of the pH of scrubber water is performed by inject|pouring into scrubber water, for example, chemical|medical solutions with high alkali values, such as NaOH (it mentions suitably as an alkali liquid hereafter). In addition, if the removal of a foreign material from scrubber water may be performed by using a centrifugal separator, for example, and isolate|separating scrubber water and a foreign material using the specific gravity difference, for example, using a filtration device, scrubber water In some cases, it is carried out by separating and foreign substances without using the specific gravity difference.

Japanese Patent No. 5968954 Japanese Patent No. 5859463 Japanese Patent No. 5784719

By the way, by adjustment of the pH of scrubber water, by _- products, such as Na2SO4, arise _in scrubber water by the polymerization reaction of scrubber water by injection|pouring of an alkali liquid. With the increase of this by-product, specific gravity of scrubber water increases. An increase in this specific gravity reduces the specific gravity difference between the number of scrubbers and foreign substances, and therefore causes a decrease in the ability to separate the number of scrubbers and foreign substances by a centrifugal separator. It originates in this, and in a water treatment apparatus, the problem that it becomes difficult to remove a foreign material from scrubber water arises. On the other hand, even when foreign matter is removed from the scrubber water by a filtration device or the like without using the specific gravity difference between the scrubber water and the foreign material, the concentration of by-products in the scrubber water becomes the threshold ( Solubility) is exceeded, and there exists a possibility that by _- products, such as Na2SO4, may precipitate without all melt|dissolving _in scrubber water. Due to this, problems, such as a situation in which a by-product (precipitate) adheres to the inner wall of a pipe, and the circulation of scrubber water is inhibited, and a situation in which the liquid injection part of a scrubber is clogged, etc. arise. In order to solve these problems, conventionally, the scrubber water whose specific gravity has increased is regularly discharged outboard, such as the sea, and fresh water is replenished to the scrubber water which remains on board, and thereby liquid fertilizer which lowers the specific gravity of the scrubber water used by a scrubber. Medium control is being implemented.

In the liquid specific gravity control, the scrubber water to be discharged to the overboard is a predetermined emission control, for example, the pH is 6.5 or more, and the polycyclic aromatic hydrocarbon (PAH) content concentration is 2250 µg/L or less , it is necessary to satisfy both that the turbidity is 25 NTU or less. For this purpose, the centrifugal separation treatment for removing foreign substances from the scrubber water to be discharged is not sufficient in one step, and may have to be performed in multiple steps (two or more steps) by a plurality of centrifuges. Moreover, the inspection apparatus which test|inspects whether the scrubber water of discharge object satisfies the said discharge|emission regulation is needed, Furthermore, the piping etc. which distribute|circulate the scrubber water of discharge object toward these apparatuses or outboard are required.

On the other hand, foreign substances (also referred to as residues) removed from the scrubber water cannot be discharged overboard on discharge regulations regardless of their properties. For this reason, the said foreign material is temporarily stored in a tank, it is disembarked at a suitable timing, and is disposed (for example, discarded by handling industrial waste).

As mentioned above, in a prior art, two types of discharge target objects from which the handling required for discharge|emission differs called the number of scrubbers discharged|emitted overboard, and the foreign material which landed and discarded will arise in a ship. For this reason, it is necessary to install the equipment and piping necessary for the outboard discharge of scrubber water, and the apparatus and piping necessary for the temporary storage of disembarking foreign substances, etc. in a limited space inside the ship, and the problem that the configuration of these apparatuses and piping becomes complicated. have. Furthermore, the manufacturing cost of a ship increases.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a water treatment apparatus in which the apparatus and piping necessary for discharging scrubber water and foreign substances can be easily configured in a ship.

In order to solve the above-mentioned subject and achieve the objective, the water treatment apparatus which concerns on this invention is a water treatment apparatus applied to the scrubber which wash|cleans the exhaust gas discharged|emitted from the marine diesel engine using scrubber water, The said scrubber a collecting tank for recovering the scrubber water used for cleaning the exhaust gas, a fresh water supply system for replenishing the collecting tank with fresh water for diluting the scrubber water, and the scrubber water from the collecting tank toward the scrubber has a circulation system for circulating the water, and a removal device for removing foreign substances in the scrubber water, wherein the scrubber water is extracted from the circulation system, and the foreign substances in the extracted scrubber water are removed by the removal device, and the foreign substances are removed. A foreign material removal system for returning the scrubber water to the circulation system, a foreign material discharge pipe for discharging the foreign material from the foreign material removal system, a storage tank for storing the foreign material discharged through the foreign material discharge pipe, and specific gravity of the scrubber water and a control device for controlling the flow of the scrubber water so that the scrubber water is discharged from the foreign material removal system to the storage tank when the measured specific gravity is greater than or equal to a predetermined reference value.

Moreover, in the said invention, the water treatment apparatus which concerns on this invention is provided with the level detector which detects the liquid level of the said scrubber water in the said collecting tank, The said control apparatus is said that the detected said liquid level is less than a predetermined low level control the fresh water supply system to start supplying fresh water to the collecting tank, and control the fresh water supply system to stop supplying fresh water to the collecting tank when the detected liquid level is higher than or equal to a predetermined high level characterized in that

Further, in the water treatment apparatus according to the present invention, in the present invention, a branch valve installed in the pipe of the foreign material removal system, and a scrubber water discharge pipe branching from the pipe of the foreign material removal system through the branch valve, , The control device, when the measured specific gravity is greater than or equal to the reference value, the scrubber water is discharged from the foreign matter removal system to the storage tank through the scrubber water discharge pipe It is characterized in that it controls the opening degree of the branch valve.

Further, in the water treatment device according to the present invention, in the above invention, the control device controls the opening degree of the branch valve to close the scrubber water discharge pipe when the detected liquid level is less than a predetermined low level characterized.

Further, in the water treatment device according to the present invention, in the above invention, the control device controls the opening degree of the branch valve to close the scrubber water discharge pipe when the measured specific gravity is less than the reference value. do.

Further, in the water treatment apparatus according to the present invention, in the above invention, the outlet end of the scrubber water discharge pipe is connected to the middle part of the foreign material discharge pipe, and the scrubber water in the scrubber water discharge pipe is discharged through the foreign material discharge pipe It is characterized in that it is discharged to the storage tank.

Moreover, in the said invention, the said water treatment apparatus which concerns on this invention, the said foreign material removal system extracts the said scrubber water from the said circulation system, The 1st piping which guides the extracted said scrubber water to the said removal apparatus; and a second pipe for returning the scrubber water after removal of foreign substances by a removal device to the circulation system, wherein the second pipe is a pipe in which the branch valve is installed among the pipes of the foreign substance removal system.

Further, in the water treatment device according to the present invention, in the above invention, the control device is discharged from the removal device to the storage tank through the foreign material discharge pipe together with the foreign material when the measured specific gravity is equal to or greater than the reference value It is characterized in that the removal device is controlled so as to increase the flow rate of the scrubber water more than when the measured specific gravity is less than the reference value.

Further, in the water treatment device according to the present invention, in the above invention, the control device is configured to, when the detected liquid level is less than a predetermined low level, from the removal device to the storage tank through the foreign material discharge pipe together with the foreign material It characterized in that the removal device is controlled so as to reduce the flow rate of the discharged scrubber water compared to a case in which the measured specific gravity is equal to or greater than the reference value.

Further, in the water treatment device according to the present invention, in the above invention, the control device is discharged to the storage tank through the foreign material discharge pipe from the removal device together with the foreign material when the measured specific gravity is less than the reference value It is characterized in that the removal device is controlled so as to reduce the flow rate of the scrubber water compared to a case in which the measured specific gravity is equal to or greater than the reference value.

Moreover, in the said invention, the said removal apparatus is a centrifugal separator which removes the foreign material in the said scrubber water using the specific gravity difference with the said scrubber water, The water treatment apparatus which concerns on this invention, It is said invention, It is characterized by the above-mentioned.

ADVANTAGE OF THE INVENTION According to the water treatment apparatus which concerns on this invention, the effect that the apparatus and piping required for discharge|emission of scrubber water and a foreign material can be comprised simply in a ship is exhibited.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows one structural example of the water treatment apparatus which concerns on Embodiment 1 of this invention.
It is a flowchart which illustrates one processing procedure of the water treatment of scrubber water by the water treatment apparatus which concerns on Embodiment 1 of this invention.
3 : is a schematic diagram which shows one structural example of the water treatment apparatus which concerns on Embodiment 2 of this invention.
4 is a flowchart illustrating one processing procedure of water treatment of scrubber water by the water treatment apparatus according to Embodiment 2 of the present invention.
5 : is a schematic diagram which shows one structural example of the water treatment apparatus which concerns on Embodiment 3 of this invention.
6 : is a schematic diagram which shows one structural example of the water treatment apparatus which concerns on Embodiment 4 of this invention.
7 : is a schematic diagram which shows one structural example of the water treatment apparatus which concerns on Embodiment 5 of this invention.
It is a schematic diagram which shows one structural example of the water treatment apparatus which concerns on Embodiment 6 of this invention.

EMBODIMENT OF THE INVENTION Hereinafter, with reference to an accompanying drawing, preferable embodiment of the water treatment apparatus which concerns on this invention is described in detail. In addition, this invention is not limited by this embodiment. In addition, the drawings are schematic, and it is necessary to note that the relationship between the dimensions of each element, the ratio of each element, etc. may differ from actual ones. Also in each of the drawings, there are cases in which parts having different dimensional relationships and ratios are included. In addition, in each figure, the same code|symbol is attached|subjected to the same structural part.

(Embodiment 1)

The structure of the water treatment apparatus which concerns on Embodiment 1 of this invention is demonstrated. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows one structural example of the water treatment apparatus which concerns on Embodiment 1 of this invention. The water treatment device 10 according to the first embodiment of the present invention treats the washing water of the exhaust gas of the marine diesel engine 110 mounted on the ship, and as shown in FIG. 1 , it is used for washing the exhaust gas. A collecting tank (1) for storing the used scrubber water, a circulation system (2) for circulating the scrubber water, and a foreign material removal system (3) for removing foreign substances in the scrubber water are provided. Moreover, the water treatment apparatus 10 of the hydrometer 4 which measures specific gravity of scrubber water, the scrubber water discharge pipe 5 for discharging the scrubber water which specific gravity increased excessively, and the foreign material removal system 3 A branch valve (6) opened between the pipe and the scrubber water discharge pipe (5), a foreign material discharge pipe (7) for discharging foreign substances removed from the scrubber water, and a non-return valve (7) for preventing backflow from the foreign material discharge pipe (7) 8) and a sludge tank 9 for storing foreign substances and the like. Moreover, the water treatment apparatus 10 includes the fresh water supply system 11 which supplies fresh water to the collecting tank 1, the chemical|medical solution supply system 12 for adjusting the pH of scrubber water, and the inside of the collecting tank 1 The level detector 13 which detects the liquid level Ls of scrubber water, the pH meter 14 which measures the pH of scrubber water, and the control apparatus 15 are provided.

Moreover, as shown in FIG. 1, the water treatment apparatus 10 is applied to the scrubber 101 which wash|cleans the exhaust gas discharged|emitted from the marine diesel engine 110 using scrubber water. In this Embodiment 1, the scrubber 101 is one structural part of the EGR system 100 which recirculates a part of exhaust gas from the marine diesel engine 110 to the marine diesel engine 110 as recirculation gas. Hereinafter, when it says exhaust gas, it means the exhaust gas discharged|emitted from the marine diesel engine 110. As shown in FIG.

In addition, in FIG. 1, distribution|circulation and piping of fluids, such as scrubber water and exhaust gas, are shown suitably by the solid arrow. The electric signal lines are appropriately shown by dashed-dotted lines. This is also the same in the following.

The collecting tank 1 is a tank which collect|recovers scrubber water. As shown in FIG. 1, the collecting tank 1 is arrange|positioned below the demister 102 connected with the scrubber 101 in the EGR system 100, and the demister 102 through the recovery pipe 104. ) is connected with The collecting tank 1 collect|recovers the scrubber water used for washing|cleaning of exhaust gas with the scrubber 101 from the demister 102 through the recovery pipe 104. At this time, scrubber water after use flows in into the demister 102 from the scrubber 101 by the action of gravity, and flows in into the collecting tank 1 through the collection pipe 104, for example. The collecting tank 1 temporarily stores the scrubber water collect|recovered in this way.

The circulation system 2 is a system for circulating scrubber water toward the scrubber 101 from the collecting tank 1 . As shown in FIG. 1, the circulation system 2 is equipped with the circulation pipe 2a, the circulation pump 2b, and the regulating valve 2c.

As for the circulation pipe 2a, an inlet end is connected to the lower part of the collecting tank 1, and an outlet end is connected to the inlet end of the injection pipe 101a of the scrubber 101. The circulation pump 2b is provided in the intermediate part of the circulation pipe 2a. The circulation pump 2b pressurizes the scrubber water which flowed in into the circulation pipe 2a from the collecting tank 1 toward the scrubber 101. Thereby, the circulation pump 2b generates the flow of the scrubber water which goes to the scrubber 101 side from the collecting tank 1 side in the circulation pipe 2a. The adjustment valve 2c is an intermediate part of the circulation pipe 2a, and is provided on the downstream side of the circulation direction of scrubber water rather than the circulation pump 2b. The adjustment valve 2c adjusts the flow volume of the scrubber water which distribute|circulates the inside of the circulation pipe 2a by control of an opening degree. The opening degree of this regulating valve 2c may be controlled by the control apparatus 15, may be controlled by another control apparatus (not shown), and may be controlled manually.

The circulation system 2 which has such a structure WHEREIN: The circulation pipe 2a transfers the scrubber water in the collecting tank 1 to the injection pipe 101a of the scrubber 101 by the action|action of the circulation pump 2b. send. The scrubber water sent to the injection piping 101a is injected from liquid injection parts, such as the injection nozzle of the scrubber 101, and is used for washing|cleaning of the exhaust gas in the scrubber 101 (reuse). The scrubber water used for cleaning this exhaust gas flows into the demister 102 from the scrubber 101 in a state containing foreign substances (such as dust and SOx) removed from the exhaust gas, and then the recovery pipe 104 is through the collecting tank (1). In this way, the circulation system 2 repeatedly circulates scrubber water between the collecting tank 1 and the scrubber 101. As shown in FIG.

The foreign material removal system|system|system|group 3 extracts scrubber water from the circulation system 2, removes the foreign material in the extracted scrubber water, and returns the scrubber water after foreign material removal to the circulation system 2. As shown in FIG. 1, such a foreign material removal system|strain 3 is equipped with the branch pipe 3a, the outlet pipe 3b, the confluence pipe 3c, and the centrifuge 3d.

The branch pipe 3a comprises piping (1st piping in the foreign material removal system|system|group 3) which extracts scrubber water from the circulation system 2 . As shown in FIG. 1, the branch pipe 3a has an inlet end connected to the circulation pipe 2a of the circulation system 2, and an outlet end connected to the inlet part of the centrifugal separator 3d. In the first embodiment, the branch pipe 3a branches from the circulation pipe 2a at a position between the circulation pump 2b and the regulating valve 2c to separate the circulation pipe 2a and the centrifuge 3d. communicate The branch pipe 3a extracts a part of the scrubber water which flows through the inside of the circulation pipe 2a, and guides the scrubber water extracted from this circulation pipe 2a to the centrifugal separator 3d.

The outlet pipe 3b and the merging pipe 3c connect a pipe (second pipe in the foreign substance removal system 3) for returning the scrubber water after removal of the foreign material by the centrifugal separator 3d to the circulation system 2 . make up As shown in FIG. 1 , the outlet pipe 3b has an inlet end connected to the outlet end of the centrifugal separator 3d and an outlet end connected to the branch valve 6 . The outlet pipe 3b receives the scrubber water after foreign material removal by the centrifugal separator 3d from the centrifugal separator 3d, and guides the received scrubber water to the branch valve 6 . Moreover, the outlet pipe 3b is connected via the branch valve 6 so that communication with the merging pipe 3c and the scrubber water discharge pipe 5 is possible. That is, the 2nd piping (outlet pipe 3b and merging pipe 3c) in the foreign material removal system 3 is piping in which the branch valve 6 is provided among piping of the foreign material removal system 3 . In the first embodiment, the scrubber water guided from the outlet pipe 3b to the branch valve 6 flows into either the confluence pipe 3c or the scrubber water discharge pipe 5 via the branch valve 6 . .

The merging pipe 3c is a pipe for returning the scrubber water after foreign matter removal by the centrifugal separator 3d to the circulation system 2 . As shown in FIG. 1, as for the merging pipe 3c, the inlet end is connected to the branch valve 6, and the outlet end is the intermediate part of the circulation pipe 2a (for example, the number of scrubbers rather than the adjustment valve 2c). downstream of the flow direction). The merging pipe 3c receives the scrubber water after foreign material removal from the outlet pipe 3b through the branch valve 6, makes the received scrubber water merge with the circulation pipe 2a, and returns it.

The centrifugal separator 3d is an example of the removal apparatus which removes the foreign material in the scrubber water in the foreign material removal system|strain 3. In this Embodiment 1, the centrifugal separator 3d receives the scrubber water extracted from the circulation pipe 2a through the branch pipe 3a (1st pipe), and removes the foreign material in the received scrubber water. At this time, the centrifugal separator 3d makes centrifugal force act on the scrubber water taken in, and separates and removes a foreign material from the scrubber water using the specific gravity difference of the scrubber water and a foreign material. The centrifugal separator 3d sends out the scrubber water after foreign material removal to the outlet pipe 3b, and sends out the foreign material (residue) removed from the scrubber water to the foreign material discharge pipe 7 .

The hydrometer 4 measures specific gravity of scrubber water. In this embodiment, the hydrometer 4 is provided in the branch pipe 3a, as shown in FIG. 1, for example. The hydrometer 4 measures the specific gravity of the scrubber water flowing through the branch pipe 3a (that is, the scrubber water extracted from the circulation pipe 2a through the branch pipe 3a). The measurement of specific gravity of the scrubber water by the hydrometer 4 may be performed continuously along a time series, may be performed intermittently at predetermined time intervals, and may be performed when measurement is instructed by the control device 15 . Whenever the hydrometer 4 measures specific gravity of scrubber water, the electric signal which shows the specific gravity (measured value) of the obtained scrubber water is transmitted to the control apparatus 15.

The scrubber water discharge pipe 5 is piping for discharging the scrubber water which specific gravity increased excessively, and branches from the piping of the foreign material removal system|system|group 3 via the branch valve 6 . In this Embodiment 1, as shown in FIG. 1, as for the scrubber water discharge pipe 5, the inlet end is connected to the branch valve 6, and the outlet end is connected to the intermediate part of the foreign material discharge pipe 7. As shown in FIG. The scrubber water discharge pipe 5 receives the scrubber water after foreign material removal from the outlet pipe 3b via the branch valve 6, and makes the scrubber water which took in flow toward the sludge tank 9. At this time, the scrubber water in the scrubber water discharge pipe 5 joins the foreign material discharge pipe 7 from the scrubber water discharge pipe 5, and is discharged to the sludge tank 9 through the foreign material discharge pipe 7 .

The branch valve 6 is a valve for distributing the scrubber water in the piping of the foreign material removal system 3 to the circulation pipe 2a side or the scrubber water discharge pipe 5 side. As shown in FIG. 1, the branch valve 6 is comprised by a three-way valve etc., and is comprised by the piping of the foreign material removal system 3 (in this Embodiment 1, the outlet pipe 3b and the merging pipe 3c) installed in the second pipe). Specifically, among the three openings of the branch valve 6 , the outlet end of the outlet pipe 3b is connected to the first opening, the inlet end of the merging pipe 3c is connected to the second opening, and the third The inlet end of the scrubber water discharge pipe 5 is connected to the opening part. The branch valve 6 has one of the opening degrees between the outlet pipe 3b and the merging pipe 3c and the opening degrees between the outlet pipe 3b and the scrubber water discharge pipe 5. Each of these openings is adjusted by decreasing the opening of the other side along with the increase. In this Embodiment 1, the branch valve 6 adjusts the other opening degree to full closing by adjusting one opening degree to full opening among these opening degrees. This opening degree adjustment is controlled by the control device 15, and based on this control, the branch valve 6 connects the distribution point of the scrubber water from the outlet pipe 3b to the merging pipe 3c (circulation pipe ( 2a) side) and the scrubber water discharge pipe 5 (sludge tank 9 side) is alternatively determined.

The foreign material discharge pipe 7 is a piping for discharging the foreign material removed from the scrubber water from the foreign material removal system 3 . As shown in FIG. 1 , the inlet end of the foreign matter discharge pipe 7 is connected to the residue discharge port of the centrifugal separator 3d and the outlet end is connected to the sludge tank 9 . The foreign material discharge pipe 7 receives, from the centrifugal separator 3d, foreign substances (for example, sludge-like residues) removed from the scrubber water by the centrifugal separator 3d, and discharges the received foreign substances to the sludge tank 9 . . Moreover, in this Embodiment 1, the scrubber water discharge pipe 5 is connected to the intermediate part of the foreign material discharge pipe 7 as mentioned above. The foreign material discharge pipe 7 discharges the scrubber water which flowed in from this scrubber water discharge pipe 5 to the sludge tank 9 .

The check valve 8 is a valve for preventing foreign substances and objects to be discharged such as scrubber water from flowing from the sludge tank 9 side to the centrifugal separator 3d side in the foreign material discharge pipe 7 (that is, reverse flow). As shown in FIG. 1 , the check valve 8 is an intermediate part of the foreign material discharge pipe 7 , and is provided at a portion on the side of the centrifuge 3d rather than the merging portion of the scrubber water discharge pipe 5 and the foreign material discharge pipe 7 . . The non-return valve 8 is configured such that the foreign matter sent from the centrifugal separator 3d to the foreign material discharge pipe 7 flows back to the centrifugal separator 3d side, and the scrubber water discharge pipe 5 joins the foreign material discharge pipe 7 Prevents scrubber water from flowing back to the centrifuge 3d side.

The sludge tank 9 is a storage tank that stores at least the foreign material discharged through the foreign material discharge pipe 7 . As shown in FIG. 1, the sludge tank 9 is provided in the position below the centrifugal separator 3d, and the foreign material discharge pipe 7 is connected as mentioned above. In this Embodiment 1, the sludge tank 9 collects and stores the foreign material and scrubber water discharged through the foreign material discharge pipe 7 etc. until it disembarks from a ship.

The fresh water supply system 11 is a system for supplying the collecting tank 1 with fresh water for diluting scrubber water. As shown in FIG. 1, the fresh water supply system 11 is equipped with the fresh water tank 11a, the supply pipe 11b, and the supply pump 11c. The fresh water tank 11a is a tank that stores fresh water. As fresh water stored in the fresh water tank 11a, the fresh water loaded from outboard, the fresh water made in ship, the drain water discharged|emitted from the marine diesel engine 110, etc. are mentioned, for example. The replenishment pipe 11b is a pipe that guides fresh water from the fresh water tank 11a to the collecting tank 1 . Specifically, the replenishment pipe 11b has an inlet end connected to the fresh water tank 11a and an outlet end connected to the collecting tank 1 . The replenishment pump 11c is provided in the intermediate part of the replenishment pipe 11b, and generates the flow of fresh water toward the collecting tank 1 side from the fresh water tank 11a side in the replenishment pipe 11b.

The fresh water supply system 11 which has such a structure replenishes fresh water to the collecting tank 1 through the supply pipe 11b from the fresh water tank 11a by the action|action of the supply pump 11c. Thereby, the number of scrubbers in the collecting tank 1 is diluted while increasing, and the specific gravity of this scrubber water falls. In the first embodiment, each timing of the fresh water supply start and supply stop by the fresh water supply system 11 (that is, the operation timing of the supply pump 11c) is controlled by the control device 15 .

The chemical liquid supply system 12 is a system for supplying the chemical liquid for adjusting (neutralizing) the pH of the scrubber water to the collecting tank 1 . In this Embodiment 1, whenever scrubber water is used for the washing|cleaning of exhaust gas by the scrubber 101, content of foreign substances, such as SOx removed from exhaust gas, is increased, and acidification of scrubber water advances by this. For this reason, as a chemical|medical solution for adjusting the pH of scrubber water, a chemical|medical solution (alkali liquid) with a high alkali value is used.

1 , the chemical liquid supply system 12 includes an alkali liquid tank 12a, a supply pipe 12b, and a supply pump 12c. The alkaline liquid tank 12a is a tank which stores alkaline liquids, such as NaOH. The supply pipe 12b is a pipe which guides the alkali solution from the alkali solution tank 12a to the collecting tank 1 . Specifically, the supply pipe 12b has an inlet end connected to the alkaline liquid tank 12a and an outlet end connected to the collecting tank 1 . The supply pump 12c is provided in the intermediate part of the supply pipe 12b, and generates the flow of the alkali liquid from the alkali liquid tank 12a side toward the collecting tank 1 side in the supply pipe 12b.

The chemical liquid supply system 12 having such a configuration supplies the alkaline liquid from the alkaline liquid tank 12a to the collecting tank 1 through the supply pipe 12b by the action of the supply pump 12c. Thereby, the scrubber water in the collecting tank 1 is neutralized by alkaline liquid, and pH of this scrubber water rises. On the other hand, since content of by _- products, such as Na2SO4 produced|generated _in scrubber water, increases with advancing of the neutralization reaction of these scrubber water and alkali liquid, specific gravity of this scrubber water increases. In the first embodiment, the timing of starting and stopping the supply of the alkali liquid by the chemical liquid supply system 12 (that is, the operation timing of the supply pump 12c) is controlled by the control device 15 .

The level detector 13 detects the liquid level Ls of the scrubber water in the collecting tank 1 . For example, as shown in FIG. 1, the level detector 13 is provided in the collecting tank 1 in the aspect which has a detector at each position of the low level and high level in the height direction of the collecting tank 1. The level detector 13 detects that the liquid level Ls is less than the low level when the liquid level Ls of the scrubber water in the collecting tank 1 is at a position lower than the low level detector. In this case, the level detector 13 transmits to the control device 15 an electric signal indicating that the liquid level Ls is less than the low level. On the other hand, the level detector 13 detects that the liquid level Ls is higher than or equal to the high level when the level Ls is higher than the high level detector. In this case, the level detector 13 transmits to the control device 15 an electric signal indicating that the liquid level Ls is higher than or equal to the high level.

In the first embodiment, the low level and the high level are threshold levels of the liquid level preset in a range between the lower limit level and the upper limit level on the equipment specifications of the collecting tank 1, respectively. That is, the low level is a threshold level equal to or higher than the lower limit level of the collecting tank 1 and lower than the high level. The high level is higher than the low level and is a threshold level below the upper limit level of the collecting tank 1 . When the amount of scrubber water in the collecting tank 1 is increased (diluted) with fresh water from a state in which the liquid level (Ls) is lowered below the low level to a state in which the liquid level (Ls) is raised to a high level or higher, the specific gravity of this scrubber water is determined by a centrifugal separator ( The number of scrubbers by 3d) is lowered to such a degree that it does not interfere with the separation treatment of foreign substances. These low level and high level are preset so that the above idea can be realized.

The pH meter 14 measures the pH of scrubber water. As shown in FIG. 1, the pH meter 14 is installed in the collecting tank 1 in such a manner that it has a detector in the lower part of the collecting tank 1 (for example, a portion lower than the low level). The pH meter 14 measures the pH of this scrubber water through the detector immersed in the scrubber water in the collecting tank 1. The measurement of the pH of the scrubber water by the pH meter 14 may be performed continuously along a time series, may be performed intermittently at predetermined time intervals, and may be performed when the measurement instruction|indication by the control apparatus 15 is carried out. . Whenever the pH meter 14 measures the pH of scrubber water, the electric signal which shows the pH (measured value) of the obtained scrubber water is transmitted to the control apparatus 15. As shown in FIG.

The control apparatus 15 is an apparatus which performs control required for the water treatment of the scrubber water by the water treatment apparatus 10. In this Embodiment 1, specific gravity control of scrubber water, pH adjustment, etc. are mentioned as water treatment of the scrubber water by the water treatment apparatus 10, for example. Specifically, the control device 15 is constituted by a CPU for executing various programs, a memory, a sequencer, and the like. The control device 15 receives electrical signals from each of the hydrometer 4, the level detector 13, and the pH meter 14 at the time of specific gravity control and pH adjustment of scrubber water, and based on these electrical signals, The branch valve 6, the replenishment pump 11c, and the feed pump 12c are respectively controlled.

For example, specific gravity control of scrubber water WHEREIN: The control apparatus 15 compares the specific gravity of the scrubber water measured by the hydrometer 4 with a preset predetermined reference value, and based on this comparison result, the number of scrubbers control the flow of In the first embodiment, the control device 15 is configured such that, when the measured specific gravity of the scrubber water is equal to or greater than the reference value, the scrubber water is discharged from the foreign material removal system 3 to the sludge tank 9, that is, the scrubber water discharge pipe. The opening degree of the branch valve 6 is controlled to open (5). Then, the control device 15 controls the branch valve 6 to close the scrubber water discharge pipe 5 based on the level detector 13 detecting that the liquid level Ls of the scrubber water is less than the low level. Control the degree of opening. Moreover, based on the liquid level Ls of scrubber water detected by the level detector 13, the control device 15 starts or stops supply of fresh water to the collecting tank 1, so that the fresh water supply system 11 ) (specifically, the replenishment pump 11c). In addition, as the reference value preset in the control device 15 as described above, for example, the number of scrubbers by the centrifugal separator 3d and the number of scrubbers that do not interfere with the separation process of foreign substances are in the specific gravity range. The upper limit value and the like are used. Hereinafter, the reference value means a predetermined reference value preset with respect to the specific gravity of the scrubber water as described above, unless otherwise specified.

Moreover, pH adjustment of scrubber water WHEREIN: The control apparatus 15 compares the pH of the scrubber water measured by the pH meter 14, and the threshold value of preset pH, Based on this comparison result, a collecting tank The chemical liquid supply system 12 is controlled to start or stop the supply of the alkaline liquid to (1). In addition, the threshold value of the said pH is the range in which each member, such as piping which contacts scrubber water in the water treatment apparatus 10, does not corrode, or the removal performance of SOx in the scrubber 101, for example. It is set in a range that does not interfere.

On the other hand, the EGR system 100 recirculates a part of exhaust gas discharged|emitted from the marine diesel engine 110 mounted on a ship to the marine diesel engine 110 as recirculation gas, and, thereby, reduces content of NOx in exhaust gas. It is a system for As shown in FIG. 1 , the EGR system 100 includes a scrubber 101 , a demister 102 , and an EGR blower 103 .

The scrubber 101 wash|cleans in order to use a part of exhaust gas discharged|emitted from the marine diesel engine 110 as recirculation gas, and the water treatment apparatus 10 which concerns on this Embodiment 1 is applied. As shown in FIG. 1, a part of exhaust gas is supplied to the scrubber 101 from the marine diesel engine 110 through piping etc. The scrubber 101 is equipped with liquid injection parts, such as a nozzle which injects scrubber water with respect to the exhaust gas of a washing|cleaning object. This liquid injection part is comprised so that scrubber water may be supplied through the injection piping 101a. The scrubber 101 injects scrubber water from this liquid injection part to a part of exhaust gas (recycle gas) supplied from the marine diesel engine 110 side, thereby removing foreign substances such as dust and SOx from the recirculation gas. It is removed to clean the recycle gas. In addition, among the exhaust gas discharged|emitted from the marine diesel engine 110, the remaining exhaust gas which is not supplied to the scrubber 101 is discharged|emitted from a stack overboard through piping etc.

The demister 102 is a hollow rectangular casing, and is connected with the outlet part of the scrubber 101. Moreover, to the lower part (bottom part) of the demister 102, the collection|recovery pipe 104 which connects to the above-mentioned collecting tank 1 is connected. The scrubber water used for washing|cleaning of the recirculation gas wash|cleaned by injection of scrubber water by the scrubber 101, and this recirculation gas flows into such a demister 102. The demister 102 separates the recycle gas after washing and the scrubber water after use. Of these recycle gas and scrubber water, the recycle gas is sent from the gas discharge port of the demister 102 to the EGR blower 103, and the scrubber water is sent from the lower part of the demister 102 through a recovery pipe 104 to a collecting tank ( 1) is returned.

The EGR blower 103 is provided in the upper part of the demister 102, as shown in FIG. The EGR blower 103 sends the recirculation gas sent out from the demister 102 to the marine diesel engine 110 through piping etc. The recirculation gas sent out from the EGR blower 103 is supplied to the combustion chamber of the marine diesel engine 110 together with air (new air), and is used as combustion gas at the time of driving|operating the marine diesel engine 110. .

Next, the processing procedure of the water treatment which the water treatment apparatus 10 implements with respect to scrubber water is demonstrated. It is a flowchart which illustrates one processing procedure of the water treatment of scrubber water by the water treatment apparatus which concerns on Embodiment 1 of this invention. The water treatment apparatus 10 (refer FIG. 1) mentioned above performs specific gravity control which is one of the water treatments of scrubber water by performing each process of step S101-S107 shown in FIG.

In detail, specific gravity control of the scrubber water by the water treatment apparatus 10 WHEREIN: As shown in FIG. 2, the control apparatus 15 first determines whether the specific gravity of the scrubber water is more than a reference value (step) S101).

In step S101, the control apparatus 15 compares the specific gravity of the scrubber water measured with the hydrometer 4, and a reference value. And when the measured value of this specific gravity is more than a reference value, the control apparatus 15 judges that specific gravity of the number of scrubbers is more than a reference value. This corresponds to that the specific gravity of the number of scrubbers repeatedly circulating between the water treatment apparatus 10 and the scrubber 101 is more than a reference value.

When specific gravity of the measured scrubber water is more than a reference value (step S101, Yes), the control apparatus 15 controls the opening degree of the branch valve 6 so that the scrubber water discharge pipe 5 may be opened (step S102). In step S102, the control apparatus 15 controls the opening degree of the branch valve 6 so that scrubber water may be discharged to the sludge tank 9 from the foreign material removal system 3 through the scrubber water discharge pipe 5. At this time, the control device 15 controls the opening degree of the branch valve 6 so that the scrubber water discharge pipe 5 side of the branch valve 6 is fully opened and the merging pipe 3c side is fully closed. do. Based on this opening degree control, the branch valve 6 alternately switches the distribution destination of the scrubber water from the outlet pipe 3b from the merging pipe 3c side to the scrubber water discharge pipe 5 side.

At the step of this step S102, circulation of scrubber water is continuously implemented between the collecting tank 1 and the scrubber 101 via the circulation pipe 2a etc. In parallel to this, a part of the scrubber water extracted from the circulation pipe 2a to the branch pipe 3a does not return to the circulation pipe 2a from the confluence pipe 3c, but is sludge through the scrubber water discharge pipe 5. It is discharged sequentially to the tank (9). As a result, the storage amount of the scrubber water in the collecting tank 1 decreases, and the liquid level Ls of this scrubber water falls with this.

After execution of step S102, the control apparatus 15 determines whether the liquid level Ls of the scrubber water in the collecting tank 1 is less than a low level (step S103). In step S103 , the control device 15 determines whether the liquid level Ls is less than the low level based on the detection result of the liquid level Ls by the level detector 13 .

Specifically, when the control device 15 does not receive, from the level detector 13, an electrical signal indicating that the liquid level Ls is less than the low level, the liquid level Ls is not less than the low level (it is above the low level) ) is determined (step S103, No). In this case, the control device 15 repeats the process of this step S103.

On the other hand, when the electric signal indicating that the liquid level Ls is less than the low level is received from the level detector 13, the control device 15 determines that the liquid level Ls is less than the low level. When the detected liquid level Ls is less than the low level (step S103, Yes), the control device 15 controls the opening degree of the branch valve 6 to close the scrubber water discharge pipe 5 (step S104).

In step S104, the control apparatus 15 controls the opening degree of the branch valve 6 so that discharge|emission of the scrubber water through the scrubber water discharge pipe 5 mentioned above may be stopped. At this time, the control device 15 controls the opening degree of the branch valve 6 so that the scrubber water discharge pipe 5 side of the branch valve 6 is fully closed and the merging pipe 3c side is fully opened. do. Based on this opening degree control, the branch valve 6 alternately switches the distribution destination of the scrubber water from the outlet pipe 3b from the scrubber water discharge pipe 5 side to the merging pipe 3c side.

In the step of this step S104, in parallel to the circulation of the scrubber water between the collecting tank 1 and the scrubber 101 described above, a part of the scrubber water extracted from the circulation pipe 2a to the branch pipe 3a is , after the foreign matter is removed by the centrifuge 3d, it is not discharged from the scrubber water discharge pipe 5, but returns to the circulation pipe 2a through the confluence pipe 3c. As a result, the reduction|decrease of the number of scrubbers in the collecting tank 1 is suppressed, and, with this, the fall of the liquid level Ls of this scrubber water is suppressed.

Then, the control apparatus 15 controls the fresh water supply system|strain 11 so that supply of the fresh water with respect to the collecting tank 1 may be started (step S105). In step S105, the control device 15 triggers that the liquid level Ls detected by the level detector 13 is less than the low level, and triggers the replenishment pump ( 11c) is controlled. At this time, the control apparatus 15 transmits the electric signal which instructs a start to the replenishment pump 11c, and starts the replenishment pump 11c. By the action of this started replenishment pump 11c, the fresh water in the fresh water tank 11a starts to be replenished to the collecting tank 1 through the replenishment pipe 11b. This fresh water supply is continuously performed until the supply pump 11c is stopped by the control device 15 .

In the step of this step S105, in parallel with circulation of the scrubber water between the collecting tank 1 and the scrubber 101 mentioned above, discharge|emission of the scrubber water from the scrubber water discharge pipe 5 to the sludge tank 9 is implemented It is not done, and fresh water is supplied sequentially in the collecting tank 1 . As a result, the number of scrubbers in the collecting tank 1 increases, and the liquid level Ls of this scrubber water rises with this. Moreover, the scrubber water in the collecting tank 1 is diluted by supply of fresh water, and the specific gravity of this scrubber water falls with this.

After execution of step S105, the control device 15 determines whether the liquid level Ls of the scrubber water in the collecting tank 1 is higher than or equal to a high level (step S106). In step S106 , the control device 15 determines whether the liquid level Ls is higher than or equal to the high level based on the detection result of the liquid level Ls by the level detector 13 .

Specifically, when the control device 15 does not receive, from the level detector 13, an electrical signal indicating that the liquid level Ls is higher than or equal to the high level, the liquid level Ls is not higher than or equal to the high level (less than the high level). ) is determined (step S106, No). In this case, the control apparatus 15 repeats the process of this step S106.

On the other hand, when the electric signal indicating that the liquid level Ls is higher than or equal to the high level is received from the level detector 13, the control device 15 determines that the liquid level Ls is equal to or higher than the high level. When the detected liquid level Ls is higher than or equal to the high level (step S106, Yes), the control device 15 controls the fresh water supply system 11 to stop supply of fresh water to the collecting tank 1 (step S107). ).

In step S107, the control apparatus 15 controls the replenishment pump 11c so that replenishment of the fresh water to the collecting tank 1 may be stopped. At this time, the control apparatus 15 transmits the electric signal which instructs a stop to the replenishment pump 11c, and stops the replenishment pump 11c. Thereby, the supply of the said fresh water by the action|action of the supply pump 11c is stopped.

In the step of this step S107, since supply of the fresh water with respect to the collecting tank 1 is stopped, the increase (dilution with fresh water) of the scrubber water in the collecting tank 1 stops, and with this, this scrubber water The rise of the liquid level (Ls) of After execution of step S107, the control device 15 returns to the above-described step S101, and repeats the processing after this step S101.

On the other hand, in step S101 described above, when the specific gravity of the scrubber water measured by the hydrometer 4 is less than the reference value, the control device 15 repeatedly circulates between the water treatment device 10 and the scrubber 101, It is determined that the specific gravity of the existing number of scrubbers is not equal to or greater than the reference value (step S101, No). In this case, the control apparatus 15 repeats the process of this step S101.

On the other hand, in this Embodiment 1, the water treatment apparatus 10 performs pH adjustment which is one of the water treatments of scrubber water in parallel with specific gravity control of the scrubber water illustrated by step S101-S107 shown in FIG. .

pH adjustment of scrubber water WHEREIN: The control apparatus 15 compares the pH of the scrubber water measured by the pH meter 14, and the threshold value of preset pH. The control device 15 controls the chemical liquid supply system 12 to start supplying the alkaline liquid to the collecting tank 1 when the measured value of the pH by the pH meter 14 is less than the threshold value. At this time, the control device 15 transmits an electric signal instructing the start to the feed pump 12c to start the feed pump 12c. By the action of the started supply pump 12c, the alkali liquid in the alkali liquid tank 12a starts to be supplied to the collecting tank 1 through the supply pipe 12b. This alkaline liquid supply is continuously performed until the supply pump 12c is stopped by the control device 15 .

On the other hand, the control device 15 controls the chemical liquid supply system 12 to stop the supply of the alkaline liquid to the collecting tank 1 when the measured value of the pH by the pH meter 14 is equal to or greater than the threshold value. At this time, the control device 15 transmits an electric signal instructing the stop to the feed pump 12c to stop the feed pump 12c. Thereby, the supply of the alkali liquid by the action of the supply pump 12c is stopped. At this stage, the scrubber water in the collecting tank 1 is fully neutralized by the supplied alkali liquid, and by this, the pH of this scrubber water is adjusted to an appropriate value (for example, about 6.5-7.5). By pH adjustment of the scrubber water as mentioned above, corrosion of apparatuses, such as the water treatment apparatus 10 and the EGR system 100, and piping through which scrubber water flows can be prevented. Furthermore, the situation in which the removal performance of SOx from the exhaust gas by the scrubber 101 is inhibited can be prevented.

As mentioned above, in the water treatment apparatus 10 which concerns on Embodiment 1 of this invention, the scrubber water used for washing|cleaning of exhaust gas with the scrubber 101 is collect|recovered in the collecting tank 1, and the scrubber water which was collect|recovered as demonstrated while circulating from the collecting tank 1 toward the scrubber 101 by the circulation system 2, the foreign material removal system 3 removes foreign substances in the scrubber water extracted from the circulation system 2, and removes foreign substances After returning the scrubber water to the circulation system (2), the removed foreign material is discharged from the foreign material removal system (3) through the foreign material discharge pipe (7) to the sludge tank (9), and measured by the hydrometer (4) When the specific gravity of the scrubber water used is equal to or greater than a predetermined reference value, the control device 15 is configured so that the scrubber water is discharged from the foreign material removal system 3 to the sludge tank 9 through the scrubber water discharge pipe 5. ) control the opening degree of the branch valve 6 established between the pipe of and the scrubber water discharge pipe 5, and the fresh water supply system 11 supplies fresh water for diluting the scrubber water to the collecting tank 1 appropriately. are doing

According to the above configuration, the specific gravity of the scrubber water can be controlled to be lower than the reference value, while the scrubber water whose specific gravity has increased to more than the reference value is stored in the sludge tank 9 without discharging it to an overboard such as the sea. For this reason, the scrubber water that has been conventionally discharged overboard is collected and stored in the sludge tank 9 together with foreign substances (residues), and these scrubber water and objects to be discharged such as foreign substances can be disembarked from the ship and discharged. . As a result, there is no need to install a device for discharging the scrubber water overboard (for example, a high-performance purification device or inspection/monitoring device to satisfy emission regulations) and piping in a limited space within the ship, and the scrubber water discharge pipe (5) Since the equipment for discharging scrubber water such as (5) can be configured in combination with the discharging facility for discharging foreign substances, the equipment and piping necessary for discharging scrubber water and foreign substances can be easily configured in the ship. , and furthermore, it is possible to reduce the manufacturing cost of the ship.

Moreover, in the water treatment apparatus 10 which concerns on Embodiment 1 of this invention, the liquid level Ls of the scrubber water in the collecting tank 1 is detected by the level detector 13, The detected liquid level Ls When this is less than a predetermined low level, the control device 15 controls the fresh water supply system 11 to start supply of fresh water to the collecting tank 1, and when the detected liquid level Ls is equal to or higher than a predetermined high level , the fresh water supply system 11 is controlled by the control device 15 to stop supply of fresh water to the collecting tank 1 . For this reason, while being able to prevent excessively reducing or increasing the number of scrubbers in the collecting tank 1, with respect to the scrubber water whose specific gravity in the collecting tank 1 increased, fresh water of the replenishment amount required for the fall of specific gravity , it is possible to inject efficiently after sufficiently reducing the number of scrubbers.

Moreover, in the water treatment apparatus 10 which concerns on Embodiment 1 of this invention, when the liquid level Ls of the scrubber water detected by the level detector 13 is less than a predetermined low level, the scrubber water discharge pipe 5 is closed. The opening degree of the branch valve 6 is controlled by the control apparatus 15 so that it may do so. For this reason, while being able to prevent the scrubber water in the collecting tank 1 from being reduced excessively with discharge|emission of the scrubber water from the scrubber water discharge pipe 5 to the sludge tank 9, At the time of supply of fresh water, the weight loss accompanying discharge|emission of the said scrubber water is eliminated, and fresh water can be supplied to the scrubber water in the collecting tank 1 without waste.

Moreover, in the water treatment apparatus 10 which concerns on Embodiment 1 of this invention, the outlet end of the scrubber water discharge pipe 5 is connected to the middle part of the foreign material discharge pipe 7, and scrubber water is discharged from the scrubber water discharge pipe 5. The piping is configured so as to be discharged to the sludge tank 9 through the foreign material discharge pipe 7 . For this reason, the foreign material discharge pipe 7 for discharging a foreign material to the sludge tank 9 can be shared as a part of the discharge path for discharging scrubber water to the sludge tank 9. As shown in FIG. As a result, while being able to make small the scale of the scrubber water discharge pipe 5 which replaces the piping for the outboard discharge of scrubber water, the piping structure for discharge|emission of the scrubber water which passes through the sludge tank 9 and a foreign material is possible as much as possible. It can be done simply.

Moreover, in the water treatment apparatus 10 which concerns on Embodiment 1 of this invention, the 1st piping (branch pipe 3a) which the foreign material removal system 3 extracts scrubber water from the circulation system 2, and A centrifugal separator (3d) for removing foreign substances in the scrubber water extracted through 1 pipe, and a second pipe (outlet pipe (3b)) for returning the scrubber water after removal of foreign substances by the centrifugal separator (3d) to the circulation system (2) and a merging pipe 3c), and a branch valve 6 to which the scrubber water discharge pipe 5 is connected is provided in the second pipe (specifically, between the outlet pipe 3b and the merging pipe 3c). making it do For this reason, piping can be comprised so that the scrubber water discharge pipe 5 may branch from between the outlet pipe 3b and the merging pipe 3c through the branch valve 6 among piping of the foreign material removal system 3 . Thereby, the scrubber water can be guided into the scrubber water discharge pipe 5 which passes through the sludge tank 9 without excessively changing the flow volume of the scrubber water (scrubber water subjected to centrifugal separation) flowing into the centrifugal separator 3d. have. As a result, the scrubber water whose specific gravity increased more than the reference value can be discharged to the sludge tank 9 through the scrubber water discharge pipe 5, ensuring stable operation of the centrifugal separator 3d.

(Embodiment 2)

Next, Embodiment 2 of the present invention will be described. In Embodiment 1 mentioned above, in the specific gravity control of scrubber water, when the liquid level Ls of the scrubber water in the collecting tank 1 is less than a low level, the scrubber water discharge pipe 5 is closed and the sludge tank 9 Although discharge|emission of the scrubber water to to was stopped, in Embodiment 2, when specific gravity of scrubber water is less than a reference value, the scrubber water discharge pipe 5 is closed, and discharge|emission of the scrubber water to the sludge tank 9 is stopped.

3 : is a schematic diagram which shows one structural example of the water treatment apparatus which concerns on Embodiment 2 of this invention. As shown in FIG. 3, the water treatment apparatus 20 which concerns on this Embodiment 2 is equipped with the control apparatus 25 instead of the control apparatus 15 of the water treatment apparatus 10 which concerns on Embodiment 1 mentioned above. do. The other structures are the same as those of the first embodiment, and the same reference numerals are attached to the same constituent parts.

In specific gravity control of scrubber water, the control apparatus 25 compares the specific gravity of the scrubber water measured by the hydrometer 4 with a preset predetermined reference value, and controls the flow of scrubber water based on this comparison result. That is, the opening degree of the branch valve 6 is controlled so as to open and close the scrubber water discharge pipe 5 . The control apparatus 25 is the same as the control apparatus 15 in Embodiment 1 mentioned above except controlling the opening degree of the branch valve 6 based on the comparison result of the specific gravity of the said scrubber water, and the reference value. do.

Next, the processing procedure of the water treatment which the water treatment apparatus 20 implements with respect to scrubber water is demonstrated. 4 is a flowchart illustrating one processing procedure of water treatment of scrubber water by the water treatment apparatus according to Embodiment 2 of the present invention. The water treatment apparatus 20 (refer FIG. 3) performs specific gravity control which is one of the water treatments of scrubber water by performing each process of step S201-S207 shown in FIG.

In detail, specific gravity control of the scrubber water by the water treatment apparatus 20 WHEREIN: As shown in FIG. 4, the control apparatus 25 first determines whether the specific gravity of the scrubber water is more than a reference value (step) S201). At this time, the control apparatus 25 performs the process of step S201 similarly to step S101 in Embodiment 1 mentioned above.

When the specific gravity of the scrubber water measured by the hydrometer 4 is equal to or greater than the reference value (step S201, Yes), the control device 25 controls the opening degree of the branch valve 6 to open the scrubber water discharge pipe 5 . (Step S202). At this time, the control apparatus 25 performs the process of step S202 similarly to step S102 in Embodiment 1 mentioned above.

In the step of this step S202, similarly to the step of step S102 in the first embodiment described above, the scrubber water is sequentially discharged to the sludge tank 9 through the scrubber water discharge pipe 5, so that the collecting tank 1 ) The storage amount of scrubber water in this decreases, and the liquid level Ls of this scrubber water falls with this.

After execution of step S202, the control apparatus 25 determines whether the liquid level Ls of the scrubber water in the collecting tank 1 is less than a low level (step S203). At this time, the control apparatus 25 performs the process of step S203 similarly to step S103 in Embodiment 1 mentioned above.

That is, when the liquid level Ls is not less than the low level (step S203, No), the control apparatus 25 repeats the process of this step S203. On the other hand, when the liquid level Ls is less than the low level (step S203, Yes), the control device 25 controls the fresh water supply system 11 to start supply of the fresh water to the collecting tank 1 (step S204). ). At this time, the control apparatus 25 performs the process of step S204 similarly to step S105 in Embodiment 1 mentioned above.

In the step of this step S204, in parallel to the circulation of the scrubber water between the collecting tank 1 and the scrubber 101 described above, a part of the scrubber water extracted from the circulation pipe 2a to the branch pipe 3a is , is continuously discharged to the sludge tank 9 through the scrubber water discharge pipe 5 . Simultaneously with this, in the collecting tank 1, fresh water is being replenished one by one. In this Embodiment 2, the replenishment amount of this fresh water is controlled so that it may become more than the discharge amount of the scrubber water from the scrubber water discharge pipe 5 to the sludge tank 9. As shown in FIG. For this reason, the number of scrubbers in the collecting tank 1 increases, and the liquid level Ls of this scrubber water rises with this. Moreover, the scrubber water in the collecting tank 1 is diluted by supply of fresh water, and the specific gravity of this scrubber water falls with this.

After execution of step S204, the control apparatus 25 determines whether the liquid level Ls of the scrubber water in the collecting tank 1 is higher than a high level (step S205). At this time, the control apparatus 25 performs the process of step S205 similarly to step S106 in Embodiment 1 mentioned above.

That is, when the liquid level Ls is not higher than or equal to the high level (step S205, No), the control device 25 repeats the process of this step S205. On the other hand, when the liquid level Ls is higher than or equal to the high level (step S205, Yes), the control device 25 controls the fresh water supply system 11 to stop supply of fresh water to the collecting tank 1 (step S206). ). At this time, the control apparatus 25 performs the process of step S206 similarly to step S107 in Embodiment 1 mentioned above.

In the step of this step S206, since supply of the fresh water with respect to the collecting tank 1 is stopped, the increase (dilution with fresh water) of the scrubber water in the collecting tank 1 stops, and with this, this scrubber water The rise of the liquid level (Ls) of After the execution of step S206, the control device 25 returns to the above-described step S201, and repeats the processing after this step S201.

On the other hand, in step S201 mentioned above, when the specific gravity of the scrubber water measured with the hydrometer 4 is less than a reference value (step S201, No), the control apparatus 25 branches so that the scrubber water discharge pipe 5 may be closed. The opening degree of the valve 6 is controlled (step S207). At this time, the control apparatus 25 performs the process of step S207 similarly to step S104 in Embodiment 1 mentioned above. Then, the control apparatus 25 returns to step S201, and repeats this process after step S201.

In the step of this step S207, in parallel with the circulation of the scrubber water between the collecting tank 1 and the scrubber 101 described above, the partial scrubber water extracted from the circulation pipe 2a to the branch pipe 3a is , after the foreign matter is removed by the centrifuge 3d, it is not discharged from the scrubber water discharge pipe 5, but returns to the circulation pipe 2a through the confluence pipe 3c. As a result, the reduction|decrease of the number of scrubbers in the collecting tank 1 is suppressed, and, with this, the fall of the liquid level Ls of this scrubber water is suppressed.

On the other hand, in this Embodiment 2, the water treatment apparatus 20 performs pH adjustment which is one of the water treatments of scrubber water in parallel with specific gravity control of the scrubber water illustrated by step S201-S207 shown in FIG. . The process which the control apparatus 25 performs in pH adjustment of this scrubber water is the same as the case of pH adjustment of the scrubber water in Embodiment 1 mentioned above.

As explained above, in the water treatment apparatus 20 which concerns on Embodiment 2 of this invention, when the liquid level Ls of scrubber water is less than a low level, the branch valve 6 so that the scrubber water discharge pipe 5 may be closed. Instead of controlling the opening degree, when the specific gravity of the scrubber water measured by the hydrometer 4 is less than the reference value, the opening degree of the branch valve 6 is adjusted by the control device 25 to close the scrubber water discharge pipe 5 Controlled, the rest is configured similarly to the first embodiment. For this reason, while enjoying the same effect as that of Embodiment 1 mentioned above, the scrubber water whose specific gravity increased more than the reference value is discharged|emitted to the sludge tank 9 through the scrubber water discharge pipe 5 as much as possible, and specific gravity The scrubber water from which the removal of the foreign material by the centrifugation process became easy with the fall of the collection tank 1 and the scrubber 101 can be circulated efficiently.

(Embodiment 3)

Next, Embodiment 3 of the present invention will be described. In Embodiment 1 described above, the outlet end of the scrubber water discharge pipe 5 is connected to the middle part of the foreign material discharge pipe 7, and the scrubber water is discharged from the scrubber water discharge pipe 5 through the foreign material discharge pipe 7 into the sludge tank ( 9), but in Embodiment 3, a scrubber water discharge pipe independent of the foreign material discharge pipe 7 is connected to the sludge tank 9, and scrubber water is directly transferred to the sludge tank 9 through this independent scrubber water discharge pipe. are emitting

5 : is a schematic diagram which shows one structural example of the water treatment apparatus which concerns on Embodiment 3 of this invention. As shown in FIG. 5, the scrubber water discharge pipe 35 independent of the water treatment apparatus 30 which concerns on this Embodiment 3 instead of the scrubber water discharge pipe 5 of the water treatment apparatus 10 which concerns on Embodiment 1 mentioned above. ) is provided. Moreover, in this water treatment apparatus 30, the above-mentioned check valve 8 (refer FIG. 1) is not provided in the foreign material discharge pipe 7. As shown in FIG. Other structures are the same as those of the first embodiment, and the same reference numerals are assigned to the same constituent parts.

The scrubber water discharge pipe 35 is a piping independent of the foreign material discharge pipe 7, and is comprised so that it may pass directly to the sludge tank 9 without interposing the foreign material discharge pipe 7 . As specifically, shown in FIG. 5, the inlet end of the scrubber water discharge pipe 35 is connected to the branch valve 6, and the outlet end is connected to the sludge tank 9. As shown in FIG. The scrubber water discharge pipe 35 receives the scrubber water after foreign material removal from the outlet pipe 3b via the branch valve 6, and discharges the received scrubber water to the sludge tank 9 directly. The scrubber water discharge pipe 35 is the same as the scrubber water discharge pipe 5 in Embodiment 1 mentioned above except having the structure by which the exit end was connected to the sludge tank 9. As shown in FIG.

As mentioned above, in the water treatment apparatus 30 which concerns on Embodiment 3 of this invention, in the water treatment apparatus 30 which concerns on Embodiment 3 of this invention, the outlet end of the scrubber water discharge pipe 35 was connected to the sludge tank 9, The scrubber water whose specific gravity increased more than the reference value. is discharged directly to the sludge tank 9 through the scrubber water discharge pipe 35 without interposing the foreign material discharge pipe 7, and the other is configured similarly to the first embodiment. For this reason, although the foreign material discharge pipe 7 and the scrubber water discharge pipe 35 are respectively connected to the sludge tank 9 as mutually independent piping, the effect similar to Embodiment 1 mentioned above can be enjoyed.

(Embodiment 4)

Next, Embodiment 4 of the present invention will be described. In the above-mentioned Embodiment 1, fresh water and alkali liquid were properly sent to the collecting tank 1 by the action of a pump, but in Embodiment 4, fresh water and alkali liquid are properly fed to the collecting tank 1 by the action of gravity or the like. are sending

6 : is a schematic diagram which shows one structural example of the water treatment apparatus which concerns on Embodiment 4 of this invention. As shown in FIG. 6, the water treatment apparatus 40 which concerns on this Embodiment 4 replaces the fresh water supply system 11 of the water treatment apparatus 10 which concerns on Embodiment 1 mentioned above, and the fresh water supply system 41. and a chemical liquid supply system 42 instead of the chemical liquid supply system 12 . The fresh water replenishment system 41 includes a replenishment pipe 41b instead of the replenishment pipe 11b of the fresh water replenishment system 11 in the above-described first embodiment, and a replenishment valve ( 41c) is provided. The chemical solution supply system 42 includes a supply pipe 42b instead of the supply pipe 12b of the chemical solution supply system 12 according to the first embodiment described above, and a supply valve 42c instead of the supply pump 12c. to provide The other structures are the same as those of the first embodiment, and the same reference numerals are attached to the same constituent parts.

The fresh water supply system 41 is to supply fresh water for diluting the scrubber water to the collecting tank 1 by the action of gravity or the like, and as described above, the fresh water tank 11a (same as the first embodiment) and , a replenishment pipe 41b, and a replenishment valve 41c. The replenishment pipe 41b is a pipe which guides fresh water from the fresh water tank 11a to the collecting tank 1, and as shown in FIG. 6, it inclines so that it may go down from the fresh water tank 11a toward the collecting tank 1 . The replenishment pipe 41b is configured similarly to the replenishment pipe 11b in the first embodiment except that it is inclined in this way. The replenishment valve 41c is a valve which opens and closes the replenishment pipe|tube 41b, and, as shown in FIG. 6, it is provided in the intermediate part of the replenishment pipe|tube 41b. The replenishment valve 41c enters an open state to enable circulation of the fresh water in the replenishment pipe 41b, and becomes a closed state to disable circulation of the fresh water in the replenishment pipe 41b.

The fresh water replenishment system 41 having such a configuration is, when the replenishment valve 41c is in an open state, from the fresh water tank 11a through the replenishment pipe 41b to the collecting tank 1 by the action of gravity. supply fresh water Moreover, the fresh water supply system 41 stops supply of the fresh water with respect to this collecting tank 1, when the supply valve 41c becomes a closed state.

In the fourth embodiment, the opening degree of the replenishment valve 41c described above is controlled by the control device 15 . That is, in step S105 among steps S105 and S107 shown in FIG. 2, the control apparatus 15 controls the replenishment valve 41c so that replenishment of the fresh water to the collecting tank 1 may be started. At this time, the control device 15 controls the opening degree of the replenishment valve 41c to be in an open state (for example, fully open), thereby opening the replenishment pipe 41b to the collecting tank 1 . Start dissemination of fresh water to Korea. The replenishment valve 41c maintains this open state and continues supply of fresh water to the collecting tank 1 until the opening degree is controlled in the closed state by the control device 15 . On the other hand, in step S107, the control apparatus 15 controls the replenishment valve 41c so that replenishment of the fresh water to the collecting tank 1 may be stopped. At this time, the control device 15 controls the opening degree of the replenishment valve 41c to be in a closed state (for example, fully closed), thereby closing the replenishment pipe 41b to the collecting tank 1 . Stop the supply of fresh water to Korea.

The chemical liquid supply system 42 supplies the chemical liquid (alkaline liquid) for adjusting the pH of the scrubber water to the collecting tank 1 by the action of gravity or the like, and as described above, the alkaline liquid tank 12a ( The same as in Embodiment 1), a supply pipe 42b, and a supply valve 42c are provided. The supply pipe 42b is a pipe which guides the alkali liquid from the alkali liquid tank 12a to the collecting tank 1, and, as shown in FIG. 6, goes down from the alkali liquid tank 12a toward the collecting tank 1 is inclined The supply pipe 42b is comprised similarly to the supply pipe 12b in Embodiment 1 except having been inclined in this way. The supply valve 42c is a valve which opens and closes the supply pipe 42b, and, as shown in FIG. 6, it is provided in the intermediate part of the supply pipe 42b. The supply valve 42c enters an open state to enable circulation of the alkali liquid in the supply pipe 42b, and becomes a closed state to disable circulation of the alkali liquid in the supply pipe 42b.

The chemical liquid supply system 42 having such a configuration is transferred from the alkaline liquid tank 12a through the supply pipe 42b to the collecting tank 1 by the action of gravity when the supply valve 42c is in the open state. Alkaline solution is supplied. In addition, the chemical liquid supply system 42 stops supply of the alkali liquid to the collecting tank 1 when the supply valve 42c is in the closed state.

In the fourth embodiment, the opening degree of the supply valve 42c described above is controlled by the control device 15 . That is, in the pH adjustment of the scrubber water, the control device 15 starts supply of the alkaline solution to the collecting tank 1 when the pH of the scrubber water measured by the pH meter 14 is less than the threshold value. The supply valve 42c is controlled. At this time, the control device 15 controls the opening degree of the supply valve 42c to be in an open state (for example, fully open), thereby leaving the supply pipe 42b in an open state for the collecting tank 1 . The supply of the alkaline solution is started. The supply valve 42c maintains this open state until the opening degree is controlled to the closed state by the control device 15 and continues the supply of the alkaline liquid to the collecting tank 1 . On the other hand, when the pH of the scrubber water measured by the pH meter 14 is equal to or higher than the threshold value, the control device 15 controls the supply valve 42c to stop the supply of the alkaline solution to the collecting tank 1 . . At this time, the control device 15 controls the opening degree of the supply valve 42c to be in a closed state (for example, fully closed), thereby leaving the supply pipe 42b in a closed state for the collecting tank 1 . Stop the supply of alkaline solution.

As described above, in the water treatment device 40 according to the fourth embodiment of the present invention, the fresh water supply start and supply stop to the collecting tank 1 by the fresh water supply system 41 and the chemical liquid supply system 42 ), the supply start and supply stop of the alkali liquid to the collecting tank 1 are performed by opening and closing of a valve and the action of gravity, and the other configuration is the same as in the first embodiment. For this reason, while enjoying the same effect as that of Embodiment 1 mentioned above, the action|action of a pump is not required for the supply of fresh water to the collecting tank 1, or supply of an alkali liquid, thereby, to the power of a pump The required power consumption can be reduced.

(Embodiment 5)

Next, Embodiment 5 of the present invention will be described. In Embodiment 1 mentioned above, the branch valve 6 which connects the scrubber water discharge pipe 5 is provided in the piping (2nd piping in the foreign material removal system 3) on the outlet side of the centrifugal separator 3d. and the scrubber water after foreign material removal by the centrifugal separator 3d was properly discharged from the scrubber water discharge pipe 5 to the sludge tank 9, in Embodiment 5, this branch valve 6 is separated by a centrifugal separator 3d ) is installed in the inlet pipe (the first pipe in the foreign material removal system 3), and the scrubber water before flowing into the centrifugal separator 3d is properly transferred from the scrubber water discharge pipe 5 to the sludge tank 9. are emitting

7 : is a schematic diagram which shows one structural example of the water treatment apparatus which concerns on Embodiment 5 of this invention. As shown in FIG. 7, the water treatment apparatus 50 which concerns on this Embodiment 5 replaces the foreign material removal system 3 of the water treatment apparatus 10 which concerns on Embodiment 1 mentioned above, and the foreign material removal system 53. and a control device 55 instead of the control device 15 . The foreign material removal system 53 is equipped with the outlet pipe 53b instead of the exit pipe 3b and the merging pipe 3c of the foreign material removal system 3 in Embodiment 1 mentioned above. Moreover, in this Embodiment 5, the branch valve 6 is provided in the intermediate part of the 1st piping in the foreign material removal system 53 (namely, the branch pipe 3a). The scrubber water discharge pipe 5 branches from the branch pipe 3a via this branch valve 6 . The other structures are the same as those of the first embodiment, and the same reference numerals are attached to the same constituent parts.

In the foreign material removal system 53, the outlet pipe 53b is a pipe for returning the scrubber water after removal of the foreign material by the centrifugal separator 3d to the circulation system 2 (the second in the foreign material removal system 53) piping). As shown in FIG. 7 , the outlet pipe 53b has an inlet end connected to the outlet end of the centrifugal separator 3d, and an outlet end of the circulation pipe 2a more than the intermediate section (for example, the control valve 2c). downstream of the flow direction of scrubber water). The outlet pipe 53b receives the scrubber water after foreign matter removal by the centrifugal separator 3d from the centrifugal separator 3d, and returns the received scrubber water to the circulation pipe 2a.

When the specific gravity of the scrubber water measured by the hydrometer 4 is equal to or greater than the reference value during specific gravity control of the scrubber water, the control device 55 controls the branch valve 6 in step S102 (refer to FIG. 2 ) described above. The opening degree is controlled by the intermediate opening degree in which both of the scrubber water discharge pipe 5 side and the branch pipe 3a side become an open state. Thereby, among the scrubber water in the branch pipe 3a, while a part of scrubber water is discharged to the sludge tank 9 through the scrubber water discharge pipe 5, the remaining scrubber water is centrifuged through the branch pipe 3a through the centrifugal separator 3d and centrifugation treatment (removal of foreign matter). Moreover, as for the control apparatus 55, when the specific gravity of the scrubber water measured with the hydrometer 4 is less than a reference value, in step S104 (refer FIG. 2) mentioned above, the scrubber water discharge pipe 5 side is fully closed. and the opening degree of the branch valve 6 is controlled so that the branch pipe 3a side is fully opened. Thereby, the scrubber water in the branch pipe 3a is not discharged|emitted from the scrubber water discharge pipe 5 to the sludge tank 9, but flows into the centrifuge 3d, and is centrifuged (removing foreign material). The control apparatus 55 is the same as the control apparatus 15 in Embodiment 1 except controlling the opening degree of the branch valve 6 to an intermediate opening degree etc. as mentioned above.

As mentioned above, in the water treatment apparatus 50 which concerns on Embodiment 5 of this invention, in the piping of the foreign material removal system 53, as demonstrated, the agent which extracts scrubber water from the circulation pipe 2a of the circulation system 2 A branch valve 6 is provided in one pipe (branch pipe 3a), and the scrubber water discharge pipe 5 branches from the first pipe via the branch valve 6, and the scrubber water discharge pipe ( When the scrubber water is discharged to the sludge tank 9 through 5), the opening degree of the branch valve 6 is controlled to an intermediate opening degree in which both the scrubber water discharge pipe 5 side and the first pipe side are in an open state. In order to do so, it is comprised similarly to Embodiment 1 and the others. For this reason, although it is a piping structure which can discharge the scrubber water before foreign material removal by the centrifugal separator 3d from the scrubber water discharge pipe 5 to the sludge tank 9, the effect similar to the above-mentioned Embodiment 1 is enjoyed can do.

(Embodiment 6)

Next, Embodiment 6 of the present invention will be described. In Embodiment 1 mentioned above, when specific gravity of scrubber water is more than a reference value, the said scrubber water was discharged to the sludge tank 9 through the scrubber water discharge pipe 5, but in Embodiment 6, the said scrubber water is a scrubber It is discharged from the centrifuge 3d to the sludge tank 9 through the foreign material discharge pipe 7 without interposing the water discharge pipe 5. As shown in FIG.

It is a schematic diagram which shows one structural example of the water treatment apparatus which concerns on Embodiment 6 of this invention. As shown in FIG. 8, the water treatment apparatus 60 which concerns on this Embodiment 6 replaces the foreign material removal system 3 of the water treatment apparatus 10 which concerns on Embodiment 1 mentioned above, The foreign material removal system 63. and a control device 65 instead of the control device 15 . The foreign material removal system 63 is equipped with the outlet pipe 53b similar to Embodiment 5 instead of the outlet pipe 3b and the merging pipe 3c of the foreign material removal system 3 in Embodiment 1 mentioned above. . Moreover, the scrubber water discharge pipe 5 and the branch valve 6 mentioned above are not provided in the foreign material removal system 63, The scrubber water is a sludge tank through the foreign material discharge pipe 7 from the centrifugal separator 3d. (9) is configured to be discharged into Other structures are the same as those of the first embodiment, and the same reference numerals are assigned to the same constituent parts.

In the specific gravity control of the scrubber water, the control device 65 compares the specific gravity of the scrubber water measured by the hydrometer 4 with a preset predetermined reference value, and controls the flow of the scrubber water based on the comparison result. That is, the flow rate of the scrubber water discharged from the centrifuge 3d together with the foreign material to the sludge tank 9 through the foreign material discharge pipe 7 is controlled. The control apparatus 65 controls the flow volume of the scrubber water discharged|emitted to the sludge tank 9 from the centrifugal separator 3d as mentioned above in specific gravity control of scrubber water, but in Embodiment 1 mentioned above. It is the same as that of the control device 15 .

In the sixth embodiment, the control device 65 performs each process other than steps S102 and S104 (each process in steps S101, S103, S105 to S107) of steps S101 to S107 shown in FIG. 2 with the first embodiment Do the same.

In step S102, instead of controlling the opening degree of the branch valve 6 so that the above-described scrubber water discharge pipe 5 is opened, the control device 65 controls the scrubber water discharge pipe 7 from the centrifugal separator 3d. ) to control the flow rate of the scrubber water to be discharged to the sludge tank 9 through the Specifically, when the specific gravity of the scrubber water measured by the hydrometer 4 is equal to or greater than the reference value, the control device 65, together with the foreign material, from the centrifuge 3d to the sludge tank 9 through the foreign material discharge pipe 7 The centrifuge 3d is controlled so that the flow rate of the scrubber water discharged|emitted may be increased more than the case where the specific gravity of the said scrubber water is less than a reference value. At this time, the control device 65 may increase the flow rate of the scrubber water discharged together with the foreign material by increasing the discharge amount of the foreign material discharged from the centrifugal separator 3d at a time, or the foreign material discharged from the centrifugal separator 3d You may increase the flow volume of the scrubber water discharged|emitted with the said foreign material by increasing the discharge frequency.

In the step after executing this step S102, the number of scrubbers greater than the number of scrubbers returning from the centrifuge 3d to the circulation pipe 2a through the outlet pipe 53b is transmitted together with the foreign substances through the foreign substance discharge pipe 7 It is sequentially discharged to the sludge tank (9). At this time, the scrubber water flow rate of the scrubber water discharged from the centrifugal separator 3d is set so that the flow rate of the scrubber water from the outlet pipe 53b to the circulation pipe 2a becomes zero (not returned to the circulation pipe 2a). to be controlled).

On the other hand, in step S104, instead of controlling the opening degree of the branch valve 6 so that the above-mentioned scrubber water discharge pipe 5 may be closed, the control device 65 centrifugal separator 3d in Embodiment 6 ) to control the flow rate of scrubber water from the centrifugal separator 3d to stop the discharge of scrubber water to the sludge tank 9 . Specifically, when the liquid level Ls of the scrubber water detected by the level detector 13 is less than a predetermined low level, the control device 65 removes the foreign material discharge pipe 7 from the centrifuge 3d together with the foreign material. The centrifugal separator 3d is controlled so as to reduce the flow rate of the scrubber water discharged to the sludge tank 9 through the hydrometer 4 compared to the case where the specific gravity of the scrubber water measured by the hydrometer 4 is equal to or greater than the reference value. At this time, the control device 65 may reduce the flow rate of the scrubber water discharged together with the foreign material by reducing the discharge amount of the foreign material discharged from the centrifugal separator 3d at once, and You may reduce the flow volume of the scrubber water discharged|emitted with the said foreign material by reducing the discharge frequency.

In the step after the execution of this step S104, the number of scrubbers greater than the number of scrubbers discharged from the centrifugal separator 3d to the sludge tank 9 through the foreign material discharge pipe 7 together with the foreign material is discharged through the outlet pipe 53b. It goes back to the circulation pipe (2a) sequentially through it.

In addition, in this Embodiment 6, the control apparatus 65 may implement the process substantially similar to steps S201 - S207 shown in FIG. That is, the control apparatus 65 may implement each process other than steps S202 and S207 (each process of step S201, S203 - S206) among steps S201 - S207 similarly to the second embodiment.

In step S202, instead of controlling the opening degree of the branch valve 6 so that the scrubber water discharge pipe 5 described above is opened, the control device 65 controls the scrubber water from the centrifugal separator 3d to the foreign material discharge pipe 7 ) to control the flow rate of the scrubber water to be discharged to the sludge tank 9 through the The processing of this step S202 is the same as that of step S102 in the sixth embodiment described above.

Moreover, in step S207, instead of controlling the opening degree of the branch valve 6 so that the control apparatus 65 may close the scrubber water discharge pipe 5 mentioned above, centrifugal separator 3d in Embodiment 6 ) to control the flow rate of scrubber water from the centrifugal separator 3d to stop the discharge of scrubber water to the sludge tank 9 . Specifically, when the specific gravity of the scrubber water measured by the hydrometer 4 is the reference value, the control device 65, together with the foreign material, from the centrifuge 3d to the sludge tank 9 through the foreign material discharge pipe 7 The centrifugal separator 3d is controlled so that the flow rate of the scrubber water discharged|emitted may be reduced compared with the case where the specific gravity of the said scrubber water is more than a reference value. The process of this step S207 is the same as that of step S104 in Embodiment 6 mentioned above.

In addition, in this Embodiment 6, the water treatment apparatus 60 performs pH adjustment which is one of the water treatments of scrubber water parallel to specific gravity control of the scrubber water mentioned above. The process which the control apparatus 65 performs in pH adjustment of this scrubber water is the same as the case of pH adjustment of the scrubber water in Embodiment 1.

As described above, in the water treatment device 60 according to the sixth embodiment of the present invention, when controlling the specific gravity of the scrubber water, it is discharged from the centrifugal separator 3d to the sludge tank 9 through the foreign material discharge pipe 7 It is made to control the flow volume of scrubber water, and it is comprised similarly to Embodiment 1 in others. For this reason, while enjoying the same effects as those of Embodiment 1 described above, it is not necessary to provide the scrubber water discharge pipe 5 and the branch valve 6 in the foreign material removal system 63, and the specific gravity is excessively increased. The scrubber water can be discharged directly from the centrifuge 3d to the sludge tank 9 through the foreign material discharge pipe 7 without passing through the scrubber water discharge pipe 5 .

In addition, in the above-mentioned Embodiments 1, 3 - 5, when the liquid level Ls of the scrubber water in the collecting tank 1 is less than the low level, the branch valve 6 closes the scrubber water discharge pipes 5 and 35. The opening degree is controlled (hereinafter, appropriately referred to as stop control of scrubber water discharge), and then the fresh water supply systems 11 and 41 are controlled to start supply of fresh water to the collecting tank 1 (hereinafter, fresh water). It is appropriately referred to as diffusion start control), but the present invention is not limited to this. For example, when the liquid level Ls of the said scrubber water is less than a low level, you may perform start control of fresh water supply first, and then perform stop control of scrubber water discharge|emission, or these control in parallel may be performed (simultaneously).

In addition, in the above-mentioned Embodiments 1 to 4, when the scrubber water is discharged to the sludge tank 9, the scrubber water discharge pipe of the branch valve 6 is fully opened, and the merging pipe (circulation system side) is completely opened. Although it was set as the closing, this invention is not limited to this. For example, when discharging scrubber water to the sludge tank 9, it is good also considering both the scrubber water discharge|emission side of the branch valve 6 and the merging pipe|tube as opening (middle opening degree).

Moreover, in Embodiment 5 mentioned above, when discharging scrubber water to the sludge tank 9, both the scrubber water discharge pipe side of the branch valve 6 and the branch pipe side were made open (middle opening degree), but this The invention is not limited to this. For example, when discharging the scrubber water to the sludge tank 9, the scrubber water discharge pipe side of the branch valve 6 is fully opened and the branch pipe side is fully closed, and the scrubber water to the centrifugal separator 3d is The inflow (centrifugal separation treatment of scrubber water) may be temporarily stopped.

Further, in the above-described embodiments 1 to 6, the specific gravity of the scrubber water in the pipe (branch pipe 3a, etc.) on the inlet side of the centrifugal separator 3d was measured with the hydrometer 4, but the present invention, It is not limited to this. For example, the specific gravity measurement of the scrubber water by the hydrometer 4 may be performed in piping (such as the outlet pipes 3b and 53b or the merging pipe 3c) on the outlet side of the centrifugal separator 3d. Or the specific gravity measurement of the scrubber water by the hydrometer 4 may be performed in the circulation path|route of scrubber water other than a foreign material removal system|system|group, such as the circulation pipe 2a, the collection pipe 104, or the collecting tank 1.

Moreover, in Embodiment 3 - 5 mentioned above, although specific gravity control of the number of scrubbers similar to Embodiment 1 was implemented, this invention is not limited to this. For example, in Embodiments 3 - 5 mentioned above, specific gravity control (refer step S201 - S207 of FIG. 4) of the scrubber number similar to Embodiment 2 may be implemented. That is, what combined suitably Embodiment 1-5 mentioned above may be sufficient as the water treatment apparatus which concerns on this invention.

Moreover, in Embodiment 1-6 mentioned above, although the scrubber 101 of the EGR system 100 was illustrated as an example of the scrubber to which the water treatment apparatus which concerns on this invention is applied, this invention is not limited to this . For example, the water treatment apparatus which concerns on this invention may be applied to exhaust gas cleaning apparatuses (scrubber) other than an EGR system.

Moreover, in Embodiment 1-6 mentioned above, although the centrifugal separator 3d was illustrated as an apparatus which removes the foreign material in scrubber water, this invention is not limited to this. For example, the removal apparatus which removes the foreign material in scrubber water may remove a foreign material from scrubber water using the specific gravity difference between scrubber water and a foreign material, and it does not use the specific gravity difference between scrubber water and a foreign material, but from scrubber water. What removes foreign substances (for example, a filtration apparatus etc.) may be sufficient. That is, in this invention, the kind in particular of the said removal apparatus does not become a problem. Moreover, the specific gravity of the scrubber water in which the by-product at the time of pH adjustment of scrubber water starts to precipitate is larger than the specific gravity of the scrubber water which affects the separation performance of the scrubber water and foreign material by the centrifugal separator 3d. For this reason, when the said removal apparatus removes a foreign material from scrubber water without using the specific gravity difference between scrubber water and a foreign material, the reference value at the time of judging whether to discharge|emit scrubber water to the sludge tank 9 (the above-mentioned) You may set the reference value in specific gravity control of the number of scrubbers) to a higher value than the case where the said removal apparatus is the centrifugal separator 3d.

Moreover, in Embodiments 1-5 mentioned above, although the pH of the scrubber water in the collecting tank 1 was measured with the pH meter 14, this invention is not limited to this. For example, the pH measurement of the scrubber water by the pH meter 14 is to the circulation pipe 2a, the piping in a foreign material removal system|system|group, or the circulation path of scrubber water other than the collection tank 1, such as the collection pipe 104. may be implemented.

In addition, this invention is not limited by Embodiment 1-6 mentioned above. What was comprised by combining each component mentioned above suitably is also included in this invention. In addition, other embodiments, examples, operating techniques, etc. made by those skilled in the art based on Embodiments 1 to 6 described above are all included in the scope of the present invention.

As described above, the water treatment device according to the present invention is useful for the treatment of scrubber water used for cleaning exhaust gas, and in particular, the device and piping necessary for discharging scrubber water and foreign substances can be easily configured in a ship. It is suitable for water treatment equipment.

1: Collecting tank
2: circulatory system
2a: circulation pipe
2b: circulation pump
2c: regulating valve
3, 53, 63: Foreign matter removal system
3a: branch pipe
3b, 53b: exit pipe
3c: confluence pipe
3d: centrifuge
4: hydrometer
5, 35: scrubber water discharge pipe
6: branch valve
7: Foreign matter discharge pipe
8: check valve
9: sludge tank
10, 20, 30, 40, 50, 60: water treatment device
11, 41: fresh water supply system
11a: fresh water tank
11b, 41b: supply pipe
11c: replenishment pump
12, 42: chemical liquid supply system
12a: alkaline liquid tank
12b, 42b: supply pipe
12c: feed pump
13: level detector
14: pH meter
15, 25, 55, 65: control unit
41c: replenishment valve
42c: supply valve
100: EGR system
101: scrubber
101a: injection pipe
102 : Demister
103: EGR Blower
104: recovery pipe
110: marine diesel engine
Ls: face level

Claims (1)

A water treatment device as described in the description of the present invention.

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