KR102084890B1 - Water treatment system applied to the ship's exhaust gas cleaning system - Google Patents

Abstract

The present invention relates to a water treatment system applied to a ship exhaust gas reduction system, which treats cleaning water discharged from the ship exhaust gas reduction system so as to be satisfied with an IMO cleaning water discharge regulation by using a membrane filter, thereby minimizing the amount of energy consumption and securing the treated water quality and the treatment capacity.

Description

WATER TREATMENT SYSTEM APPLIED TO THE SHIP'S EXHAUST GAS CLEANING SYSTEM}

The present invention relates to a water treatment apparatus applied to a ship exhaust gas reduction system, and more specifically, to treat the water discharged from the vessel exhaust gas reduction system using a membrane filtration device to satisfy the IMO clean water discharge regulations. Of course, the present invention relates to a water treatment apparatus applied to a ship exhaust gas reduction system that can secure treated water quality and treatment capacity while minimizing energy consumption.

In general, the water treatment apparatus of the ship exhaust gas reduction system (EGCS) has a disadvantage in accordance with the treatment method.

In the case of precipitation method, a separate precipitant is required, and large precipitation space and time are required to precipitate fine particles.

In the case of the specific gravity separation method using centrifugal force, a separate precipitant must be used to separate the fine particles, and foreign substances having a small specific gravity difference with water are disadvantageous. In addition, in the case of the total filtration method for filtering the entire raw water including the foreign matter through the membrane filtration device, there is a problem that it is difficult to maintain the treatment capacity as the pores are rapidly blocked at high turbidity, and in the case of the cross flow filtration method, the crossover is performed even at low turbidity There is a problem that the energy consumption is very large to maintain the flow.

Therefore, at present, there is a need for a technology capable of securing treatment water quality and treatment capacity while minimizing energy consumption.

Korean Patent Registration No. 10-1291353

The present invention has been made to solve the above-described problems, using the membrane filtration device to clean the water discharged from the ship exhaust gas reduction system to satisfy the IMO clean water discharge regulations, as well as to minimize the energy consumption of the treated water quality An object of the present invention is to provide a water treatment apparatus applied to a ship exhaust gas reduction system capable of securing an excess capacity.

The water treatment apparatus applied to the ship exhaust gas reduction system according to an embodiment of the present invention is connected to the process tank of the ship exhaust gas reduction system, the sedimentation tank for depositing and storing the foreign matter contained in the washing water supplied from the process tank and A multipurpose tank including a filtrate tank for storing filtered water after completion of water treatment, a turbidity meter for measuring turbidity of washing water in the sedimentation tank, a membrane filter device, and a turbidity measurement result of the turbidity meter corresponds to a first state. Supply pump to pressurize and transfer the internal washing water into the membrane filter device, and if the turbidity measurement result of the turbidity meter corresponds to the second state, by increasing the flow rate of the washing water in the membrane filter device. Crossflow pump to allow crossflow filtration to proceed, within the membrane filter Based on a pressure transmitter for measuring the pressure of the washing water inlet and the washing water outlet, and a result of sensing the pressure transmitter or a predetermined period input to a timer, the filtered water in the filtered water tank is reversed from the filtering direction of the membrane filter device. It may include a backwasher to pressurized transfer to remove the foreign matter attached to the membrane surface of the membrane filter device.

In one embodiment, the membrane filtration device includes at least one filtration membrane, the filtration membrane has a water passage through which the washing water in the longitudinal direction, it may be characterized in that one or more filtration pores are formed on the inner surface of the water passage. .

In one embodiment, the filtration membrane may be characterized in that any one of a microfilter membrane or ultrafiltration membrane (ultrafiltration membrane) is applied.

In one embodiment, the membrane filtration device is provided on the washing water inlet side of the filtration membrane, foreign matter is attached to the surface of the filtration membrane by inducing rapid rotational or turbulent flow to the cross flow of the washing water flowing into the through-hole of the filtration membrane It may be characterized in that it further comprises a rotational flow forming means for preventing.

In one embodiment, the backwasher includes a pump, a backwash valve and a discharge control valve, wherein the backwash valve is opened and the pump is opened based on a sensing result of the pressure transmitter or a predetermined period of a timer. The filtered water in the multipurpose tank is transferred to the membrane filter device through the backwash valve so that the filtered water flows in the membrane filter device in a direction opposite to the filtration direction so that foreign matters attached to the membrane surface of the membrane filter device are dropped. And, the filtered water containing the foreign matter may be characterized in that the re-transmission to the settling tank through the discharge control valve.

In one embodiment, it may further include a back pulse generator for delaying the adhesion period of the foreign matter attached to the surface of the filter membrane by generating a pulse by injecting the filtered water in the reverse direction to the surface of the filter membrane of the membrane filter.

In one embodiment, the back pulse generator includes a cylinder, a motor, an intermittent spur gear connected to the motor and a recreation gear linear gear piston reciprocating linearly in the cylinder by an elastic member, wherein the cylinder includes one or more checks. A valve may be provided.

In one embodiment, the settling tank may further comprise a partition plate of 50 to 60 degrees inclined multilayer structure for depositing foreign matter in the washing water transferred from the process tank.

In one embodiment, the foreign matter accumulated in the settling tank by the partition plate may be transported to the sludge tank through the feed pump according to the detection result of the turbidity meter or the cycle input to the timer.

In one embodiment, it may further comprise an activated carbon adsorption filter for additionally filtering the filtered water filtered by the foreign matter through the membrane filtration device.

According to an aspect of the present invention, by using the membrane filtration device has the advantage that the water treatment from the ship exhaust gas reduction system can be treated with water to satisfy the IMO clean water discharge regulations.

In particular, it has the advantage of ensuring the treated water quality and treatment capacity while minimizing energy consumption.

In addition, according to one aspect of the present invention, the membrane filter device is accumulated foreign matter on the surface and clogging occurs over time to prevent this by periodically backwashing to prevent the filtration capacity of the membrane filter device to be constant Has the advantage of being maintained.

In addition, according to an aspect of the present invention, the foreign matter adhering to the membrane surface by using a small amount of pre-filtered filtered water using a back pulse generator generates a pulse (pulsation) continuously and repeatedly in the filtration process, it is not attached to the foreign matter Has the advantage of being prevented.

In addition, according to an aspect of the present invention, by inducing a rapid rotational flow to the cross flow of the washing water flowing into the through-hole of the filtration membrane through the rotational flow forming means it is possible to wash the foreign matter on the surface of the filtration membrane by the shear force of the rotating fluid flow, By arranging the current alternately to form a turbulent flow has the advantage of preventing foreign matter from being attached.

In particular, according to an aspect of the present invention, including a pre-treatment settling tank having a multi-layer plate and a partition plate to generate a maximum precipitation effect at the minimum area to accelerate the precipitation using the area of the multi-layer plate and re-injury using a partition plate As a preventive method, a relatively large and dense foreign material can be quickly removed to reduce and protect the load of the membrane filter installed in the rear stage.

1 is a view showing the overall state in which the water treatment apparatus 100 is applied to a ship exhaust gas reduction system.
2 is a view showing the concept of the total amount of filtration and cross-flow filtration method and the pressure and flow characteristics.
3 is a view showing in more detail the configuration of the water treatment apparatus 100 applied to the ship exhaust gas reduction system according to an embodiment of the present invention.
4 is a view showing a state in which the whole amount filtration process is performed through the feed pump 140 shown in FIG.
FIG. 5 is a diagram illustrating a state in which a cross flow filtration process is performed through the cross flow pump 150 shown in FIG. 3.
FIG. 6 is a view illustrating a state in which foreign matter is periodically transferred to the sludge tank according to the result of the turbidity meter through the supply pump 140 shown in FIG. 3.
FIG. 7 is a view showing the shape of the filtration membrane 131 of the membrane filtration device 130 shown in FIG.
FIG. 8 is a view showing a state in which rotational flow of washing water is induced by the rotational flow forming means 133 applied to the filtration membrane 131 shown in FIG. 7.
9 is a view showing a state in which turbulence is induced in the washing water by arranging the rotational flow forming means 133 applied to the filtration membrane 131 shown in FIG.
FIG. 10 is a view illustrating a state in which the rotational flow forming unit 133 illustrated in FIG. 8 is installed in the filtration membrane 131.
FIG. 11 is a view illustrating a state in which a backwashing process is performed through the backwasher 170 illustrated in FIG. 3.
12 and 13 illustrate the configuration of the back pulse generator 180 shown in FIG. 3 in more detail.

Hereinafter, preferred examples are provided to aid in understanding the present invention. However, the following examples are merely provided to more easily understand the present invention, and the contents of the present invention are not limited by the examples.

1 is a view showing the overall state in which the water treatment apparatus 100 is applied to a ship exhaust gas reduction system.

Referring to Figure 1, the water treatment apparatus 100 applied to the ship exhaust gas reduction system according to the present invention is applied to the ship exhaust gas reduction system, in particular, after receiving the washing water from the process tank and the water treatment process again filtered water to the process tank To be supplied to the ship, or to an outboard discharge or temporary storage tank.

At this time, in the present invention, all of the washing water supplied from the process tank is pressurized and transferred to the membrane filtration device to treat the whole amount of water by filtration or by cross flow filtration. This will be described with reference to FIG. 2.

Figure 2 is a diagram showing the total amount of filtration and cross-flow filtration method.

Referring to Figure 2, the total amount of filtration means only the supply pump to run the washing water is supplied to the membrane filter to filter the whole amount, the cross-flow filtration method in addition to the supply pump to operate the cross-flow pump in the membrane filter By passing through the surface of the filter membrane quickly and repeatedly in the washing water has the effect of preventing the accumulation of foreign matter on the surface of the filter membrane by the shear force generated on the surface of the filter membrane by the cross flow itself.

3 is a view showing in more detail the configuration of the water treatment apparatus 100 applied to the ship exhaust gas reduction system according to an embodiment of the present invention.

Referring to Figure 3, the water treatment apparatus 100 applied to the ship exhaust gas reduction system according to an embodiment of the present invention is largely a multi-purpose tank 110, turbidity meter 120, membrane filtration device 130, feed pump ( 140, the cross flow pump 150, the pressure transmitter 160, the backwasher 170, and the back pulse generator 180 may be configured.

The multipurpose tank 110 is configured to include a sedimentation tank 111, a partition plate 112 of a multi-layer structure and a filtrate tank 113.

The sedimentation tank 111 is connected to the process tank of the ship exhaust gas reduction system, and serves to settle and store foreign substances contained in the washing water supplied from the process tank.

At this time, the relatively large and heavy foreign matter having a settling speed faster than the flow of water is deposited by the sedimentation tank 111 through the partition plate 112 of the inclined multilayer structure of 50 degrees to 60 degrees.

The upper side of the multi-purpose tank 110 is provided with a filtered water tank 113 for storing the filtered water is completed, the sedimentation tank 111 is provided below the multi-purpose tank (110).

At this time, the washing water primarily filtered by the settling tank 111 is transferred to the membrane filtration device 130 through the supply pump 140 to be described later.

One side of the multi-purpose tank 110 is provided with a turbidity measuring unit 120 for measuring the turbidity of the washing water, the foreign matter is primarily filtered.

The turbidity measuring unit 120 primarily measures the turbidity of the washing water from which foreign substances are filtered, and the supply pump 140 and the cross-flow pump 150 described later selectively select an operating state based on the turbidity measuring unit 120 turbidity measurement results. Controlled. This will be described in more detail with reference to FIGS. 4 and 5.

4 is a view illustrating a state in which the whole amount filtration process is performed through the feed pump 140 shown in FIG. 3, and FIG. 5 is a cross flow filtration process performed through the crossflow pump 150 shown in FIG. 3. It is a figure which shows the state to become.

First, referring to FIG. 4, the washing water introduced from the process tank is first introduced into the settling tank 111. At this time, a relatively large and heavy foreign matter having a faster precipitation effect than the flow of water is precipitated by the multi-layered plate 112 of the inclined multilayer structure is accumulated in the sedimentation tank 111. The turbidity measuring unit 120 primarily measures the turbidity of the washing water in which foreign matters are filtered out. When the turbidity measurement result is a first state (a state in which turbidity is not high), the washing water in which the foreign substances are filtered out is first supplied to the supply pump 140. The whole amount is supplied to the membrane filter device 130 through), and the whole amount is filtered. At this time, a pulse (pulsation) may be induced on the surface of the filtration membrane of the membrane filtration device 130 through the back pulse generator 180. The back pulse generator 180 causes pulsation to prevent foreign matter from adhering to the surface of the filter membrane, thereby delaying the time for clogging of the surface of the filter membrane.

Filtrate filtered through the membrane filtration device 130 is stored in the filtrate tank 113 again through the filtrate control valve and flow meter.

Referring to FIG. 5, the washing water introduced from the process tank is first introduced into the settling tank 111. At this time, a relatively large and heavy foreign matter having a faster precipitation effect than the flow of water is precipitated by the multilayer plate 112 of the multi-layer structure is stacked in the sedimentation tank 111. The turbidity measuring unit 120 primarily measures the turbidity of the washing water in which foreign matters are filtered. When the turbidity measurement result is a second state (high turbidity), the washing water in which the foreign substances are filtered first is supplied to the supply pump 140. Through the cross-flow filtration process by supplying to the membrane filtration device 130 as well as by operating the cross-flow pump 150 to quickly increase the flow rate of the washing water in the membrane filtration device 130.

At this time, as the cross flow filtration process proceeds, as the cross flow pump 150 is operated to increase the flow rate in the membrane filtration device 130, the washing water quickly and repeatedly passes the surface of the filtration membrane. Therefore, the accumulation of foreign matter on the surface of the filter membrane may be prevented by the shear force generated on the surface of the filter membrane by the cross flow itself. At this time, a pulse (pulsation) may be induced on the surface of the filtration membrane of the membrane filtration device 130 through the back pulse generator 180. The back pulse generator 180 causes pulsation so that foreign matters are not attached to the surface of the filter membrane, thereby delaying the time for clogging of the surface of the filter membrane. Filtrate filtered through the membrane filtration device 130 is stored in the filtrate tank 113 again through the filtrate control valve and flow meter.

FIG. 6 is a view illustrating a state in which foreign matter is periodically transferred to the sludge tank according to the result of the turbidity meter through the supply pump 140 shown in FIG. 3.

Looking at Figure 6, the feed pump 140 also serves to discharge a large amount of foreign matter accumulated in the sedimentation tank 111 to the sludge tank to discharge to the outside. At this time, the foreign substances accumulated in the washing water and the sedimentation tank 111 is first discharged together in the sludge tank direction.

Membrane filtration device 130 serves to filter the washing water filtered primarily foreign matters supplied from the supply pump 140 to generate filtered water. This will be described in more detail with reference to FIGS. 7 to 10.

7 is a view showing the shape of the filtration membrane 131 of the membrane filtration device 130 shown in FIG. 3, Figure 8 is a rotational flow forming means 133 applied to the filtration membrane 131 shown in FIG. FIG. 9 is a view illustrating a state in which rotation flow of washing water is induced, and FIG. 9 is arranged in a reverse direction by rotating rotation forming means 133 applied to the filtration membrane 131 shown in FIG. FIG. 10 is a diagram illustrating a guided state, and FIG. 10 is a view illustrating a state in which the rotational flow forming unit 133 illustrated in FIG. 8 is installed in the filtration membrane 131.

7 to 10, the membrane filtration device 130 includes one or more filtration membranes 131, and the filtration membrane 131 has one or more flow holes 132 through which washing water flows in a length direction. One or more filtration pores are formed on the inner surface of the through hole 132. The filtration membrane 131 may be applied to any one of a microfilter membrane or an ultrafiltration membrane.

On the other hand, the membrane filtration device 130 may further include a rotary flow forming means 133 is provided on the washing water inlet side of the filtration membrane 131.

The rotary flow forming means 133 is provided on the washing water inlet side of the filtration membrane 131, and induces a rapid rotational flow to the cross flow of the washing water flowing into the water passage 132 of the filtration membrane 131, thereby filtering the membrane 131. ) It prevents foreign matter from adhering to the surface and induces cleaning by rotating shear force.

The rotational flow forming means 133 may be installed in the opposite direction in series to generate turbulence inside the filtration membrane 131, thereby preventing foreign matter from adhering to the surface of the filtration membrane 131.

3, the pressure transmitter 160 detects the differential pressure by measuring the pressure between the washing water inlet and the washing water outlet in the membrane filter 130. Based on the detected differential pressure, it is possible to check whether clogging occurs in the filtration membrane 131. If it is determined that the pressure transmitter 160 detects the differential pressure, or the backwasher 170 is periodically operated.

The backwasher 170 blocks the filtered water in the pre-filtered filtrate tank 113 based on the detection result of the pressure transmitter 160 during the total flow filtration or the cross-flow filtration or the period imparted to Tyman. Pressure transfer in the direction toward the filtration membrane 131 (that is, the opposite direction of the filtration) serves to remove foreign matter attached to the surface of the filtration membrane 131. Looking at this in more detail as follows.

FIG. 11 is a view illustrating a state in which a backwashing process is performed through the backwasher 170 illustrated in FIG. 3.

3 and 11, the backwasher 170 is connected to the pump 171 connected to the filtrate tank 113, the backwash valve 172 connected to the pump 171, and the membrane filtration device 130. It is configured to include a discharge control valve 173 for discharging the foreign matter separated from the filtration membrane 131 back to the settling tank 111.

When it is determined that the differential pressure has been generated as a result of the detection of the pressure transmitter 160 or according to the period set in the timer, the backwash valve 172 is opened and the pump 171 is operated so that the filtrate tank 113 is operated. The filtered water inside is pressurized and conveyed in the direction toward the filtration membrane 131. Therefore, foreign matter adhering to the surface of the filtration membrane 131 is pushed away in the opposite direction to the filtration direction. The foreign matter thus fallen is again transferred to the settling tank 111 through the discharge control valve 173 is seized through the partition plate 112 of the multi-layer structure. The strength of the backwashing may be adjusted by controlling the flow rate of the backwashing flow according to the opening ratio of the discharge control valve 173.

3, the back pulse generator 180 delaying the adhesion period of the foreign matter adhering to the surface of the filtration membrane 131 by generating a pulse (pulsation) on the surface of the filtration membrane 131 on one side of the membrane filtration device 130. To be prepared. This will be described in more detail with reference to FIGS. 12 and 13.

12 and 13 illustrate the configuration of the back pulse generator 180 shown in FIG. 3 in more detail.

12 and 13, the back pulse generator 180 is connected to the intermittent spur gear 183 and the intermittent spur gear 183 connected to the cylinder 181, the motor 182, and the motor 182, and the motor ( It comprises a recreation gear piston 184 that reciprocates linearly quickly in the cylinder 181 by the rotational force of the 182 and the restoring force of the elastic member.

At this time, the cylinder 181 is provided with one or more check valves, by the rotational speed of the motor 182 and the intermittent spur gear 183, the retraction gear piston 184 retreats backward in the cylinder 181, the intermittent spur gear ( The tooth of 183 is separated from the teeth of the recreation gear piston 184 and at the same time, it advances rapidly with the recovery force of the elastic member. Therefore, a small amount of filtrate pre-filtered in the reverse direction to the filtration membrane 131 is strongly introduced, causing short and strong pulsation in the membrane filtration device 130. Therefore, it is possible to prevent the foreign matter from being temporarily shaken off and stuck and grown on the filtration membrane 131. Backpulse is characterized by strong inflow of very small amount of filtered water for a short time of 1 second to 2 seconds compared to backwashing, and it can prevent foreign matter adhesion with cleaning effect, increase the average yield of the filtered water and increase the backwashing cycle. It has the advantage of being longer.

In addition, in one embodiment, the present invention may further include an activated carbon adsorption filter 190 for additionally filtering the filtered water filtered by the foreign matter through the membrane filtration device (130). The activated carbon adsorption filter 190 may be provided after the outboard discharge valve or between the pump 171 and the discharge valve (outboard discharge / process tank).

While the foregoing has been described with reference to preferred embodiments of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated.

100: water treatment system applied to the ship exhaust gas reduction system
110: multi purpose tank
111: sedimentation tank
112: multilayer board
113: filtrate tank
120: Turbidity Meter
130: membrane filtration device
131: filtration membrane
132: plumber
133: rotational flow forming means
140: feed pump
150: crossflow pump
160: pressure transmitter
170: backwash
171: pump
172: backwash valve
173: discharge control valve
180: back pulse generator
181: cylinder
182: motor
183: intermittent spur gear
184: recreation gear piston
185: elastic member
190: activated carbon adsorption filter

Claims (10)

A multi-purpose tank connected to a process tank of a ship exhaust gas reduction system, the sedimentation tank for depositing and storing foreign substances contained in the washing water supplied from the process tank, and a filtrate tank for storing the filtrate having completed the water treatment;
A turbidity meter for measuring turbidity of the washing water in the precipitation tank;
Membrane filtration apparatus;
When the turbidity measurement results of the turbidity measuring instrument corresponds to the first state, the feed pump for pressurizing the transfer of the washing water in the sedimentation tank into the membrane filtration device to proceed the whole amount filtration process;
A cross-flow pump for performing a cross-flow filtration process by increasing the flow rate of the washing water in the membrane filter device when the turbidity measurement result of the turbidity meter corresponds to the second state;
A pressure transmitter for detecting whether a differential pressure is generated by measuring a pressure between the washing water inlet and the washing water outlet in the membrane filter;
Based on the detection result of the pressure transmitter or a period previously input to the timer, the filtered water in the pre-filtered filtrate tank is pressurized and transferred in the opposite direction to the filtration direction of the membrane filter device so that foreign matter adhered to the membrane surface of the membrane filter device. A backwash to allow removal; And
Based on the period inputted to the timer, the filtered filtrate in the filtrate tank is pressurized and transferred in the opposite direction to the filtration direction of the membrane filter device to cause pulsation in the membrane filter device to remove foreign substances adhering to the membrane surface. It includes; back pulse generator to prevent the stuck;
The multipurpose tank,
And a sedimentation tank having an inclined partition plate having a multi-layered structure for depositing foreign matter in the washing water transferred from the process tank.
The method of claim 1,
The membrane filter device,
One or more filtration membranes,
The filtration membrane has a water passage through which the washing water flows in a length direction, and at least one filtration pore is formed on the inner surface of the water passage, which is applied to a ship exhaust gas reduction system.
The method of claim 2,
The filtration membrane,
A water treatment device applied to a ship exhaust gas reduction system, characterized in that either one of a microfilter membrane or an ultrafiltration membrane is applied.
The method of claim 2,
The membrane filter device,
Rotational flow forming means provided on the washing water inlet side of the filtration membrane to induce a rapid rotational flow to the cross-flow of the washing water flowing into the through-hole of the filtration membrane to wash foreign matter on the surface of the filtration membrane by the shear force of the rotational flow; Further comprising, water treatment apparatus applied to the ship exhaust gas reduction system.
The method of claim 4, wherein
The rotary flow forming means,
It is provided on the side of the washing water inlet of the filtration membrane, is arranged to cross the direction of the rotation flow, and induces turbulence in the cross flow of the washing water flowing into the through hole of the filtration membrane to prevent foreign matter from adhering to the surface of the filtration membrane At least one rotational forming means; comprising a water treatment apparatus applied to the ship exhaust gas reduction system.
The method of claim 1,
The backwasher,
A pump, a backwash valve and a discharge control valve;
Based on the sensing result of the pressure transmitter, the backwash valve is opened and the pump pressurizes the filtered water in the filtrate tank through the backwash valve into the membrane filter device, thereby filtering in the membrane filter device. To allow the filtered water to flow in the opposite direction to the foreign matter attached to the membrane surface of the membrane filter device,
The washing water containing the foreign matter dropped is re-transmitted to the sedimentation tank through the discharge control valve, water treatment apparatus applied to the ship exhaust gas reduction system.
The method of claim 1,
The back pulse generator,
A cylinder including one or more check valves;
A motor connected to the intermittent spur gear; And
And a recreation gear piston engaged with the intermittent spur gear and reciprocating linearly in the cylinder by the rotational force of the motor and the restoring force of the elastic member.
delete The method of claim 1,
The foreign matter accumulated in the sedimentation tank by the partition plate is transferred to the sludge tank through the feed pump according to a cycle previously input to the turbidity meter or timer, water treatment apparatus applied to the ship exhaust gas reduction system.
The method of claim 1,
Activated carbon adsorption filter for further filtering the filtered water filtered by the foreign matter through the membrane filtration device; characterized in that it further comprises, water treatment apparatus applied to the ship exhaust gas reduction system.

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