KR100941375B1 - Heat exchanger plate using fish holding for draining heat withdraw system - Google Patents

Abstract

PURPOSE: A heat collection system for a land sea water farm is provided, which can maximize efficiency of a heat exchanger continuously by preventing contaminant deposition of the heat exchanger plate. CONSTITUTION: A heat collection system for a land sea water farm comprises a first strainer(10) for eliminating the suspended material; a drained water recovery pump(20) collecting the drained water; an automatic preprocessing flushing filter(30) which precipitates sludge equipped in drained water using a water recovery pump; a titanium heat exchanger(80) for dropping or raising the temperature; a jet cleaning device(50) washing the inside of the titanium heat exchanger part; and an automatic operation control device(70) controlling the operation of the connected drain valve.

Description

Heat exchanger plate using fish holding for draining heat withdraw system}

The present invention relates to a drainage heat recovery system using a plate heat exchanger, and more specifically, to increase the temperature of the sea water (about 5 ℃) through the plate titanium heat exchanger discharged water (about 20 ℃) discharged from the seawater farm, The pretreatment device of the automatic cleaning filter is installed at the filter feeder and the heat exchanger discharge water inlet end, thereby continually maximizing the efficiency of the heat exchanger by preventing the deposition and blockage of contaminants in the heat exchanger board, which is the most serious problem of reducing the efficiency of the conventional plate heat exchanger. It is configured to do so.

In general, marine aquaculture products grown and cultured on land are sensitive to temperature, and water management is the biggest factor affecting fish production in aquaculture, especially when the water temperature (0 ~ 9 ℃) falls in and out of winter, such as winter. There is a big problem in the growth of marine aquaculture organisms due to the decrease in the activity and food intake of marine products (fish, shellfish, crustaceans, etc.).

As a solution to this problem, the temperature of seawater flowing into aquaculture farms has been increased by using boilers for a long time. Increasing energy costs (light oil and bunker oil) have long put pressure on farm operations, and improvements are being proposed.

Therefore, in order to solve this problem, drainage heat recovery machines have been widely used to recover the temperature of the drainage (discharged water) discharged from the farm. However, in any type of waste heat recovery device, the heat exchange efficiency decreases as the service life passes, and sludge (protein, mucus, fish carcass, feed, etc.) is deposited on the surface of the heat plate where heat exchange is the main cause. Continues (efficiency decreases to about 20%)

As the waste heat recovery machine, a perfusion type heat exchanger (SHELL & TUBE TYPE) and a circular plate overlap type heat exchanger (ROUND TYPE) occupy most of them, but due to problems in use, normal use is not made.

The double flow type heat exchanger (SHELL & TUBE TYPE) is the most commonly used heat exchanger using the temperature difference between the inside and outside of the tube inserted into the tank. However, the manufacturing cost is high, the heat exchange efficiency is low, economic efficiency is low, it takes up a lot of space, and there is a difficulty in maintenance, the device is not preferred.

In addition, the round plate heat exchanger (ROUND TYPE) exchanges heat between the drainage (hot water) and the sea water (cold water) between the CIRCULAR PLATE and the disc, so that the heat exchange efficiency is higher than that of the perfusion type heat exchanger, but the material of the disc is stainless. It is produced by the seawater, and is mixed with drainage and seawater as the main cause of fish farming fish farming. In addition, sludge (protein, mucus, fish carcass, feed, etc.) is deposited on the surface of the heat plate where heat exchange is performed, and the efficiency decrease (less than 50%) continues. In addition, expensive maintenance costs ($ 2 million / year for hotplate replacement) are a burden on the aquaculture industry.

The conventional waste heat recovery machine has a lot of problems in use due to the high maintenance cost and the complicated cleaning operation, and also receives the exterior of the aquaculture industry through the use of the structure and the material that can mix the drainage (hot water) and the sea water (cold water). There is a situation. In addition, the longer the period of use, there was a problem, such as the dead body and mucus components of the fish inside the waste heat recovery machine to form a film, the efficiency is reduced.

The present invention was developed to solve the problems of the conventional waste heat recoverers as described above, the present invention comprises a plate heat exchanger structure of the waste heat recovery, the material is heat conduction proportional to the thickness of the hot plate using titanium corrosion-resistant to sea water The purpose is to maximize the efficiency of heat exchange by making it ultra thin to minimize time.

In addition, the other purpose is to install the pre-treatment device of the primary strainer and the secondary automatic washing filter to remove the mucus components such as fish carcass, protein and fat in the drainage (hot water) entering the plate-type titanium heat exchanger to deposit sludge inside the heat exchanger plate. And to prevent the blockage phenomenon to maximize the heat exchange efficiency.

In addition, it is possible to lower the operation rate of heating devices (boilers, etc.) that discharge air pollutants such as fossil fuels, thereby lowering the generation of carbon dioxide, and increase the development of aquaculture such as biological carcasses, feed residues and secretions discharged from breeding tanks. It can be meaningful to reduce the emission of pollutants.

The present invention is a problem solving means for achieving the above object is installed in the suction end of the drainage tank of aquaculture farms for removing large suspended matter; A pretreatment automatic cleaning filter for supplying the wastewater filtered by the primary strainer (hot water) by the operation of a drainage recovery pump to prevent sludge contained in the drainage to prevent closure; And a spray cleaning device for cleaning the inside of the plate-type titanium heat exchanger at the same time provided in the pretreatment automatic washing filter line to clean the contaminants filtered by the pretreatment automatic cleaning filter, and connected between the drainage pump and the pretreatment automatic cleaning filter. A drain inlet valve provided in the drain inlet line, a differential pressure gauge and a bypass valve provided in the drain inlet line between the drain inlet valve and the drain recovery pump, a drain valve provided under the outer case of the pretreatment automatic filter, the pretreatment It characterized in that it comprises an automatic operation control device for controlling the operation of the filtration drain valve provided in the filtration drainage line connected between the automatic washing filter and the plate-type titanium heat exchanger.

According to the drainage heat recovery system for aquaculture farms using a plate heat exchanger according to the present invention, the fish carcasses, feed residues, excreta, secretions and the like generated from aquaculture fish in aquaculture tanks are removed by a primary manure network and a pretreatment automatic washing filter. As it prevents sludge deposition and blockage inside the plate-type titanium heat exchanger, the heat exchange efficiency is maximized.In addition, the water discharged to lower temperature by heat exchange with seawater (inflow: 2 ~ 8 ℃) flowing from the plate-type titanium heat exchanger is discharged. And, the warmed sea water can increase the temperature of the sea water (inflow water: 2 ~ 8 ℃) supplied to the heating device again without a separate device, the heating time of the heating device is reduced, the amount of heating heat is saved, Fuel savings provide the effect of supplying large amounts of seawater to the aquarium.

Hereinafter, with reference to the accompanying drawings will be described in detail for the implementation of the invention as follows.

1 is a block diagram showing the overall configuration of the drainage heat recovery system for onshore seawater farms using a plate heat exchanger according to the present invention, Figure 2 is a drainage heat recovery system for land seawater farms using a plate heat exchanger according to the present invention Figure 3 is a schematic view showing the flow of the heated sea water, Figure 3 is a cross-sectional view of the main components of the automatic pre-treatment controller of the drainage heat recovery system for onshore seawater farms using a plate heat exchanger according to the invention, Figure 4 is Fig. 5 is a block diagram showing the structure of the plate heat exchanger of the drainage heat recovery system for onshore seawater farms using the plate heat exchanger.

1 to 5, the drainage heat recovery system for onshore seawater farms using a plate heat exchanger according to the present invention is installed in the suction end of the drainage pump 1 of the drainage tank 1 of the farm, a large float (meat carcass, Primary manure network 10 for removing feed debris, excreta, secretions, etc.); Pre-treatment automatic cleaning filter for supplying drained water (hot water) filtered by the primary strainer 10 to the drain recovery pump 20 to sediment the sludge contained in the drainage to prevent clogging and adhesion of efficiency-reducing substances. 30); It is composed of a plate-type titanium heat exchanger 80 for receiving the filtered drainage and seawater (cold water) from the pretreatment automatic washing filter 30 to heat and cool the temperature by performing heat exchange for the drainage and seawater.

The primary sieve 10 is installed at the suction end of the drainage recovery pump 20 of the farm, and made of a quick coupling type made of a structure that is easy to remove, mounted on the suction end of the drainage recovery pump.

The drainage recovery pump 20 is provided on the drainage inlet line 21 connected between the primary strainer 10 and the pretreatment automatic washing filter 30 to automatically filter the wastewater (hot water) filtered by the primary strainer 10. It is supplied to the cleaning filter (30).

The pretreatment automatic cleaning filter 30 has an outer case 33 having a plurality of pedestal 32 at the bottom; An inner strainer (40) seated on the blocking piece (34) extending in the upper region of the outer case (33) and spaced apart from the bottom of the outer case (33); It consists of an upper cover 36 which is sealed on the outer case 33 and detachably fastened.

 The inner sieve mesh 40 is the upper flange 41 which is seated on the blocking piece 34 of the inner circumference of the outer case 33 at the top; A metal net 43 formed in communication with the upper flange 41 and having a plurality of circular or rectangular through holes 42 formed in the outer circumferential wall and the bottom surface area; It consists of a filter net body 45 is fixed to the outer periphery of the metal net 43 by a fastening means such as a fastening band.

At this time, a plurality of vertical rods 46 are provided at the upper portion of the upper flange 41, and the compression rods 47 are interposed in the vertical rods 46 to support the metal mesh 43 elastically.

On the other hand, the spray cleaning device 500 is provided in the inner region of the upper cover 36 and the inner mantle 40 of the pretreatment automatic washing machine 30, the contaminant and plate-type titanium heat exchanger filtered inside the inner mantle 40 (80) The inside is cleaned.

The spray cleaning device 50 has an upper portion protruding in the central region of the upper cover 36, and the lower region is rotatably arranged in the inner sieve mesh 40, and a plurality of spray holes 52a are formed. An injection nozzle 52; A washing water tank 54 connected to the upper portion of the rotary radial injection nozzle 52 by a first line 53 and storing washing water therein; A washing pump 56 provided in the washing water tank 50 for spraying the washing water therein at a high pressure through the injection hole 52a of the radial nozzle 52; It is connected to the first line 53 is connected to the high pressure air line 58 is composed of a compressor (59) for supplying high-pressure air.

At this time, the operation of the cleaning pump 56 and the compressor 59 is controlled by the control of the automatic operation control device 70 which will be described later.

On the other hand, the washing water tank 54 may be used as a chemical dissolving tank for cleaning the chemical, if necessary, connected to the plate-type titanium heat exchanger 80 and the second line (80a), at the same time inside the operation of the pretreatment device The furnace washing water flows in at high pressure, and the washing operation of the intermittent heat transfer plate 81 is performed in parallel.

When the jet cleaning device 50 is accumulated to some extent in the inner mantle 40 by the differential pressure gauge 61 provided in the drainage inflow line 21 on one side of the outer case 33, the cleaning pump ( 56 and the compressor 59 are operated to spray the washing water at a high pressure through the injection hole 52a of the rotary radial injection nozzle 52, and the washing water along the second line 80a. Flows into the heat transfer plate 81, and partial cleaning of the heat transfer plate is performed. At this time, the bypass valve 62 is opened at the same time, and the inflow of the drain water is sent to the drain tank 1 again. At the end of the process, it is closed and drainage is introduced into the pretreatment unit.

In addition, the drain inlet line 21 between the drain inlet valve 60 and the drain recovery pump 20 is provided with a bypass valve 62 and a drain line 64 having a drain valve 63 at the lower part thereof. The other side is provided with a filtration drainage line 65 connected to the plate-type titanium heat exchanger 80, the filtration drainage line 65 is provided with a filtration drainage valve 66.

The cleaning pump 56, the compressor 59, the drain inlet valve 60, the differential pressure gauge 61, the bypass valve 62, the drain valve 63 and the filtration drain valve 66 is an automatic operation control device 70 Is electrically connected so that its operation is automatically controlled by the control program.

At this time, the control signal of the pretreatment device is operated by the electrical contact method, each valve is driven by the air pressure of the compressor in the pneumatic valve type.

On the other hand, the end of the drain line 64 is provided with a sludge screen 68 is provided with a strainer (68a) to remove the sludge generated from the automatic pre-cleaning device 30, the fish generated in the fish tank 3 It will be possible to artificially collect and remove substances that may cause red tide or marine pollution, such as cadavers and feed dregs.

The plate-type titanium heat exchanger 80 is composed of a plurality of heat transfer plates 81 made of corrugated titanium, and the heat transfer plates 81 are formed with holes 81a to allow two kinds of fluids to pass in two circuits. Several sheets are overlapped between the frame 82 and the moving frame 83 and fixed with a plurality of long tightening bolts 84.

In addition, upper and lower guide bars 85a and 85b are provided at upper and lower sides of the fixed frame 82 and the moving frame 83, and a rear spotter 86 is provided at the rear.

At this time, a gasket 81b is attached to the periphery of each heat transfer plate 81 to seal the fluid so as not to leak to the outside, and the sea water and drainage are mixed or leaked inside the heat transfer plate 81. And, when cleaning and disassembling the hot plate, the frame, which supports the hot plate during assembly after disassembly and cleaning, must be aligned at the same interval (interval determined at the time of shipment), and the left and right sides of the jig stand (circular bar bar) are not shown. ), It prevents water leakage and deformation of hot plate due to gaps during assembly.

On the other hand, the two types of fluids are connected to the fixed frame 82 through the holes 81a of the heat transfer plate 81 so as to communicate with each other.

That is, the filtration drainage line (65) is connected to the pretreatment automatic washing filter (30) to receive the filtered waste water (hot water: 20-23 ° C) from the pretreatment automatic washing filter (30), and the seawater supply line (87). Sea water (inflow water: 2 ~ 8 ℃) is directly supplied through the seawater receives the heat transfer from the drainage to the heated seawater, is supplied to the heating device 110, which will be described later, the heat transfer is discharged to the discharge.

Heated sea water (18-22 ° C.) heat-exchanged as described above is re-supplied to the heating device (110) through the heated sea water line (88) to replace the sea water (2-8 ° C.) It is supplied to the heating time of the heating device 110 is reduced, the amount of heating heat is saved, the fuel is saved, it is possible to supply a lot of warm water to the breeding tank (3) breeding tank.

On the other hand, the sea water (inflow water: 2 ~ 8 ℃) is supplied to the heating device 110, such as a boiler and a heater pump by the sea water pump 100 is heated to 18 ~ 22 ℃ and supplied to the culture longevity tank (3) The meat is bred, and the heated seawater introduced into the cultured longevity tank (3) is collected in the drainage tank (1), and the meat carcasses and feed are passed through the primary strainer (10) and the pretreatment automatic cleaning filter (30). Residue, excreta, secretions and the like is filtered and supplied to the plate-type titanium heat exchanger 80 is a heat exchange is to continue to circulate.

In addition, the titanium heat exchanger (80) is a digital thermometer (90, 91, 92) to the filtration drainage line (65), the seawater supply line (87), the warm seawater line (88), and the drainage discharge line (89). 93) is provided to measure the heat exchange efficiency temperature.

An operation state of the present invention configured as described above will be described.

As shown in Figure 1 and Figure 2, the first drainage (20 ~ 23 ℃) of the drainage tank (1) from the primary strainer 10 to remove large floats (meat carcasses, feed dregs, feces, secretions, etc.), This is supplied to the pre-treatment automatic cleaning filter 30 through the drainage inlet line 21 by the operation of the drainage recovery pump 20 to prevent the blockage phenomenon as the sludge contained in the drainage is deposited therein.

As described above, the first and second wastewaters (20 to 23 ° C) filtered from the primary strainer 10 and the pretreatment automatic washing filter 30 are introduced into the plate-type titanium heat exchanger 80 along the filtration drainage line 65.

At the same time, cold sea water (inflow water: 2 to 8 ° C.) is introduced into the plate-type titanium heat exchanger 80 through the sea water supply line 87 as a pumping force of the sea water pump 100 to thereby perform heat exchange.

In other words, while passing through the holes 81a of the plurality of heat transfer plates 81 made of titanium constituting the plate-type titanium heat exchanger 80 alternately (two-time structure), the wastewater and the seawater do not mix, and the filtration drainage having high temperature (20-23 degreeC) is heat-transfer to low seawater (inflow water: 2-8 degreeC), and seawater is heated to about 18-22 degreeC, and the heat exchanged wastewater is reduced to about 11 degreeC. (FIG. 4) And FIG. 5)

 At this time, the heat exchange is completed after the heat exchange is removed foreign matter is discharged along the wastewater discharge line (89), the heated seawater heat exchanged to 18 ~ 22 ℃ is supplied to the heating device 110 through the heated seawater line (88) Instead of inflow water (2 ~ 8 ℃) supplied to the heating device at 18 ~ 22 ℃, it saves the heating time of the heating device 110, lowers the operation rate of the heating device, and saves fuel, and makes a lot of seawater in the farm I can supply it.

Meanwhile, as shown in FIG. 2, seawater (inflow water: 2 to 8 ° C.) is supplied to a heating device 110 such as a boiler and a heater pump by the sea water pump 100, and warmed to 18 to 22 ° C. to produce a cultured water tank 3. It is fed to the breeding of young meat, the warmed seawater introduced into the cultured longevity tank (3) is collected in the drainage tank (1) as described above through the primary strainer (10) and pre-processing automatic washing filter (30) Meat carcasses, feed debris, excreta, and secretions are filtered and supplied to the plate-type titanium heat exchanger 80 to circulate through heat exchange.

On the other hand, as shown in FIG. 3, a schematic operation state of the pre-processing automatic washing filter 30, the large flotation (dissolved carcasses, such as fish) generated as a dissolution form (fish, shellfish, crustaceans) as the primary manure network 10 , Feed waste, excreta, secretions, etc.) of the drain inlet valve 60 by the control of the automatic operation control device 70 by the operation of the drainage recovery pump 20 Opening is supplied into the pretreatment automatic washing filter 30 through the drainage inlet line 21 to filter the sludge contained in the drainage.

That is, the drainage flows into the outer case 33 constituting the pre-processing automatic cleaning filter 30 by the operation of the drainage recovery pump 20, and the lower end of the cut-off piece 34 of the inner peripheral upper region of the outer case 33 is lowered. The sludge (protein, mucus, fish carcass, feed, etc.) is supplied to the through-hole 42 and the filtering mesh 45 of the metal mesh 43 as it is supplied to the inner sieve mesh 40 seated apart from the bottom of the outer case 33. ) Will be hung.

At this time, to some extent the residue in the inner mantle 40 by the measured value of the differential pressure gauge 61 provided in the drainage inlet line 21 on one side of the outer case 33 operated by the control of the automatic operation control device 70. When it is accumulated, the differential pressure between the drainage inflow line 21 and the filtration drainage line 65 is sensed, and the pretreatment device is operated, and the washing pump 56 is operated to wash the washing water with the high pressure air pressure of the compressor 59. In addition, it is injected through the injection hole 52a of the rotary radial injection nozzle 52 at a high pressure.

That is, the washing pump 56 is operated by the control of the automatic operation control device 70 so that the washing water of the washing water tank 54 is simultaneously supplied with the air pressure of the compressor 59 through the first line 53 and the upper cover 36. Rotating radial spray nozzles 52 rotatably inserted in the vertical direction are sprayed to the inner wall and the lower portion through the spray holes 52a to the outer periphery and bottom surface of the metal mesh 43, and to the filtering mesh 45. It will clean up the stuck sludge. The sludge cleaned here can be artificially treated using a separate filtration filter (recoverable total amount of influent wastewater sludge).

At the same time, the washing water is also introduced into the plate-type titanium heat exchanger 80 at a high pressure to periodically remove the adhesive in the heat transfer plate 81 inside the plate-type titanium heat exchanger 80. Doing so can remove 99% of the total deposit.

In addition, the waste water sludged in the pre-treatment automatic washing filter 30 is opened by the filtration drain valve 66 of the filtration drainage line 65 is supplied to the plate-type titanium heat exchanger 80 to perform heat exchange. On the other hand, the differential pressure gauge 61 is provided on the drain inlet line 21 of the pretreatment automatic washing filter 30 to measure the pressure, and the drain inlet line 21 between the drain inlet valve 60 and the drain pump 22. Bypass valve 62 is provided in () to send the drain back to the drain tank, to prevent damage due to the pressure of the pipe, the drain valve 63 in the lower case 33 of the pre-processing automatic washing filter 30 Is provided, to discharge the removed sludge or the like.

Drainage heat recovery system for onshore seawater farms using a plate heat exchanger according to the present invention described above is not limited to the above embodiment, in the field to which the present invention belongs without departing from the spirit of the invention claimed in the following claims. Anyone with ordinary knowledge will have the technical idea to the extent that various changes can be made.

1 is a block diagram showing the overall configuration of the waste heat recovery system for onshore seawater farm using a plate heat exchanger according to the present invention.

Figure 2 is a schematic diagram showing the flow of the warmed sea water of the waste heat recovery system for onshore seawater farms using a plate heat exchanger according to the present invention.

3 is a cross-sectional view of main components of an automatic pre-treatment controller for a plate heat recovery system for plate farms using a heat exchanger according to the present invention;

Figure 4 is a block diagram showing the structure of a plate heat exchanger of a waste heat recovery system for farms using a plate heat exchanger according to the present invention.

FIG. 5 is an exploded view illustrating main parts of FIG. 4. FIG.

<Description of the symbols for the main parts of the drawings>

1: Drainage tank 3: Aquaculture tank

10: primary filter network 20: drainage recovery pump

30: pretreatment automatic cleaning filter 33: outer case

34: blocking piece 36: upper cover

40: inner manipulator 41: upper flange

42: through hole 43: metal mesh

45: filter network 46: vertical rod

47: compression spring 50: spray cleaning device

52: rotary radial injection nozzle 52a: injection hole

53: first line 54: washing water tank

56: cleaning pump 58: high pressure air line

59: compressor 64: drain line

68: Sludge Screen 68a: Filter Screen

70: automatic operation control device 80: plate titanium heat exchanger

Claims (6)

Primary strainer (10) is installed in the suction end of the drainage tank (1) of the fish farm (3) to remove the large floatation caused by the dissolution form; A pre-treatment automatic cleaning filter (30) for preventing the blockage phenomenon and the attachment of efficiency-lowering substances by depositing the sludge contained in the drainage by receiving the wastewater filtered by the primary strainer (10) by the operation of the drainage recovery pump (20); A plate-type titanium heat exchanger (80) for receiving the filtered drainage and seawater from the pretreatment automatic washing filter (30) to heat and drain the drainage and the seawater; And A spray cleaning device (50) provided at a line of the pretreatment automatic cleaning filter (30) to clean contaminants filtered by the pretreatment automatic cleaning filter (30) and to clean the inside of the plate-type titanium heat exchanger (80); Drain inlet valve (60), differential pressure gauge (61) and the drain inlet valve (60) provided in the drain inlet line (21) connected between the drain recovery pump (20) and the pretreatment automatic cleaning filter (30). Bypass valve 62 provided in the drainage inlet line 21 between the 20, the drain valve 63 provided below the outer case 33 of the pre-treatment automatic filter 30, the pre-treatment automatic filter An automatic operation control device (70) for controlling the operation of the filtration drain valve (66) provided in the filtration drain line (65) connected between the 30 and the plate-type titanium heat exchanger (80); Wastewater heat recovery system for onshore seawater farms using a plate heat exchanger comprising a. The method of claim 1, wherein the pre-processing automatic cleaning filter 30 An outer case 33 having a pedestal 32 at the bottom and a blocking piece 34 at the upper inner region; An inner strainer (40) mounted on the blocking piece (34) so that its lower end is spaced apart from the bottom of the outer case (33); Consists of the upper cover 36 is fastened to the outer case 33 to be sealed and detachable, Drainage for land and seawater farms using the plate heat exchanger to clean the inside of the plate-type titanium heat exchanger (80) at the same time to clean the contaminants filtered inside the inner sieve (40) by the spray cleaning device (50) Heat recovery system. According to claim 2, wherein the inner mantle 40 is An upper flange 41 seated on the blocking piece 34; A metal net 43 formed in communication with the upper flange 41 and having a circular or rectangular through hole 42 formed in the inner circumferential wall and the bottom surface area; The waste heat recovery system for onshore seawater farms using a plate heat exchanger, characterized in that consisting of a filter net 45 is fixed to the outer periphery of the metal net (43). According to claim 3, A plurality of vertical rods 46 are provided on the upper edge of the upper flange 41, The vertical rods 46 are interposed with a compression spring 47 to support the metal mesh 43 elastically characterized in that the heat recovery system for land and seawater farms using a plate heat exchanger. The method of claim 2, The jet cleaning device 50 The upper portion is rotatably inserted into the central region of the upper cover 36, the lower region is located inside the inner sieve mesh 40, the rotating radial spray nozzle 52 and the plurality of injection holes 52a are inclined; ; A washing water tank 54 connected to the upper portion of the rotary radial injection nozzle 52 by a first line 53 and storing washing water therein; A washing pump 56 provided in the washing water tank 54 for injecting the washing water therein into the inner sieve network 40 through the injection hole 52a of the rotary radial injection nozzle 52; The drainage heat recovery system for onshore seawater farms using a plate heat exchanger, comprising a compressor (59) connected to the first line (53) by a high pressure air line (58) to supply high-pressure air. According to claim 2, The sludge screen 68 is characterized in that the sludge screen 68 is provided with a strainer 68a at the end of the drain line 64 to remove the sludge generated in the pre-processing automatic cleaning device 30 Drainage heat recovery system for onshore seawater farm using heat exchanger.

Images