KR20020025078A - Method and device for preventing organism growth on sea-cases and seawater systems on ships, offshore platforms, etc. - Google Patents

Abstract

The invention relates to a method and a device on ships, offshore-platforms, etc. for protecting against organism growth in complete seawater systems, operated on the basis of briefly raising the temperature of a volume of water (1) which is isolated by a mechanical closure system (4, 12). The brief temperature increase destroys the growth of organisms or their larvae without the need for toxic, environmentally damaging substances. Once the closure system has been opened, the normal cooling operation is resumed. The waste heat from the motor is used to raise the temperature for short periods of time. The mechanical closure of a sea-case is described as an application example. In cooling systems, comprising several circuits, joined by a mixing tank, each sub-circuit can be heated separately for a brief period, using the assembly of different heat exchangers and the integrated control and regulatory systems, thus preventing organism growth.

Description

METHOD AND DEVICE FOR PREVENTING ORGANISM GROWTH ON SEA-CASES AND SEAWATER SYSTEMS ON SHIPS, OFFSHORE PLATFORMS, ETC.}

The growth of organisms in ships, parts of ships and pipeline systems, and their components, has increased significantly, especially as seawater pollution increases. Various measures are being taken internationally to reduce or prevent the growth of such organisms.

1. German Patent Application Publication No. 31 23 682 discloses an alloy of at least one element, such as 5-30% by weight of Mn and up to 5% by weight of Sn, having an alpha-single phase structure, for organic growth Safe metal fabrication materials are described. However, a disadvantage of the material is that the cost of the ship is significantly increased because no standard steel is used in the ship structure at all.

2. In German Patent Application Publication No. 36 28 150, a similar manner is selected in which a tacky layer formed of a CuNi-alloy plate is provided with a priming layer to form a self-adhesive adhesive layer.

3. The outer skin of current ships is protected against growth by an antifouling-painting system that is polished spontaneously. In this method group, a protective layer for inhibiting growth or preventing erosion is formed, for example, by a plasma polymerization reaction according to German Patent Application No. 3522 817, or silicon on a metal surface according to German Patent Application No. 2756 495. Natural rubber is provided. However, in this method, contamination of seawater by chemical substances is considered a disadvantage.

4. Cathodic protection devices in which Cu-ions dissolve outward from sacrificial anodes due to electrochemical potentials are cost-intensive and toxic methods, albeit unusual methods for inhibiting growth.

5. According to German Patent Application No. 4109 197, a voltage which is variable in polarity and strength is applied to a special antifouling-protective coating layer, in which the pH-value is varied and a thin water film which must inhibit growth is formed. The multi-layered collar structure required is better suited for smooth surface than a cooling system, and therefore is suitable for large vessel outer walls.

6. In US Patent Publication 3 309 167, a growth retardation method is described in which the growth retardation effect of temperature rises to be regularly repeated is used. In contrast to the invention aimed at heating seawater introduced in a closed system which is closed for a short time, the above-mentioned U.S. patent discloses that the externally protected surface to be protected is directly heated by means of an electrically operated heating element, thereby providing additional energy. It will cost money.

7. US Pat. No. 3 650 677 describes a seawater treatment method for temporarily coating the inner wall with the addition of vegetable oils and fats, in particular to prevent breakage by ice formation and to prevent corrosion during the winter season. The higher temperatures referred to in this patent publication relate to the removal of oil and fat at the end of the heating or winter of oils and fats for sprinkling in seawater. The association with growth inhibition is unknown. Growth typically starts at 10 ° C. temperature in late spring, rather than at risk of ice formation in winter.

The present invention is directed to claim 1 for the purpose of protecting components such as filters, armatures, pipelines, heat exchangers, pumps, seawater coolers, etc., which are in intermittent or continuous contact with seawater while the seawater and seawater systems are open. Therefore, the use of waste heat contained in the engine coolant prevents the growth of organisms in seawater, especially in seawater-coolers, used in ships and offshore-platforms, for local and short-term overheating of incoming seawater as desired. A method and apparatus for

1 is a principle configuration of the seawater with a closing inlet slot and outlet slot,

Figure 2 is a schematic diagram showing the seawater in the discharge slot is closed,

3 is a schematic diagram of a seawater armor type door for closing an inlet slot,

FIG. 4 is a schematic diagram of FIG. 1 showing a combination cooler, that is, a cooler incorporating a hot-sea subcooler and a cold-sea subcooler.

5 is a schematic diagram of a high temperature circulation system and a low temperature circulation system with an additional external heat exchanger,

6 is a schematic view of a rollable elastic plate for closing the inlet slot and outlet slot,

7 is a circuit diagram of the seawater in operation and cleaning operation in the sea.

Explanation of symbols on the main parts of the drawings

1, 1A, 1B: Seawater 2, 2A, 2B: Low-temperature seawater cooler

3: discharge slot 4, 4A, 4B: seawater armor type door

5: exhaust device 6 washing connection

7: zinc anode 8: slot for inflow

9 integrated hot-pipe bundle 10 armor door drive device

11: guide rail 12: armor type door box

13: main engine 14: plate heat exchanger

15 additional heat exchanger 16 temperature control valve

17: movable elastic plate 18: double cover

19: mixing tank 20A: sea water circulation pump, operation

20B: seawater circulation pump, non-operating

21A; B: interrupted armature, sea water-flow, operation; Non-operation

22A; B: cut-off armature, seawater-backflow, operation; Non-operation

It is an object of the present invention to prevent and avoid growth of organisms on surfaces that are in contact with seawater intermittently or continuously in seawater, pipelines, filters, heat exchangers, armatures, pumps, seawater coolers, By developing an effective and environmentally friendly method and device, the device is simple and can be used and installed at a low cost, is characterized by being easy to manage and operate, and requires only little operation without the use of toxic materials. Cost alone can protect the parts against growth.

This object is achieved according to the invention by the advantages described in claims 1 to 13.

The subsea cooler for engine coolant is provided with an anti-fouling paint layer that provides protection against growth for only a short time. The so-called cryo-sea water cooler, which has an engine coolant inlet temperature of about 45 ° C., provides ideal growth conditions for larvae such as sea smallpox, shellfish and the like, as a result of which the cooling efficiency is extremely limited by growth already in a short time. And for safety reasons it is designed with a surface capacity of> 30%.

By comparison, hot-sea subsea coolers with about 75-90 ° C. of engine coolant enter little or no growth organisms. On the one hand, experiments have shown that growth can be continually inhibited by the action of very large shear forces due to high flow rates or by overheating for a short period of time, which is limited at local and time limited but at regular intervals. appear. In the latter case, the precondition for economically overheating the seawater for a short time is to sufficiently separate the seawater to be heated from the surrounding water.

The advantages of the present invention are that the seawater cooler can deliver greater cooling efficiency despite the reduction of the cooling surface by preventing growth in the seawater cooler when the component sizes are the same, and the seawater if the efficiency is similar. The cooler is configured to be as small as approximately 20%, which makes it easier to place it inside a very small sea bath. The ability to recycle common steel for smaller structural sizes and pipe bundles significantly reduces the cost of the seawater cooler itself. Thus, the preliminary cooler provided for the case may be abandoned. The energy required to heat the incoming seawater is provided by the hot engine coolant or by the diesel generator coolant.

The complete seawater with all inserts can be protected by the same coating system, resulting in a complex coating process of CuNi 10 Fe-pipe bundles and, consequently, of the electrolytic corrosion that occurs after the coating of the pipe bundles is damaged. The problem is solved.

Finally, the possibility of the principle remodeling of the closure mechanism can also be mentioned for ships already on board.

The invention is described in detail below with reference to a number of examples.

In order to restrict the heating of the seawater in the closed seawater box 1 according to the location, the high temperature coolant of the main engine 13 or alternatively the cylinder coolant of the diesel generator is used, and the cylinder coolant is converted into a low temperature coolant circulation system. It is connected with the seawater subcooler 2 using a switching armature.

1 shows the principle construction of a seawater tank 1 with a seawater box 1 with a cold-sea water cooler 2 and an armored door 12 for blocking the draining slot 3. Shows. The blocking of the inlet slot 8 is similarly made. Other inserts include an exhaust device 5, a cleaning connection 6, and a zinc anode 7. During normal operation (operation at sea), the low temperature engine coolant of about 45 ° C circulates through the low temperature seawater cooler (2), and the seawater is seawater through the inlet slot (8) at a temperature of up to 32 ° C. 1) It is introduced inside. The seawater exits the seawater box 1 through the discharge slot 3 after cooling the engine cooling water to at least 36 ° C. through the low temperature seawater cooler 2. After the larvae of the growing organism continue to enter the seawater with the seawater (1), the larvae decompose when the flow is low, such as during patrol driving, while docking at the port and at the berth ( 1) and accumulate inside the seawater insert. At this time, in the seawater box 1, the inflow slots and the outflow slots 8 and 3 are closed by the seawater armor type door 4 according to the present invention. If the temperature ratio and mounting conditions are particularly advantageous, the closing of the discharge slot can be made sufficiently.

2 shows the structure of a seawater armored door 4 consisting of a drive device 10, an armored door 12 and a thin plate, in a blocking example for the discharge slot 3. The guide rail 11 is mounted on the inner surface of the outer skin of the seawater 1 and is provided on the guide rail with the necessary support and a circumferential seal as necessary to reach watertightness. If the inlet and outlet slots 8 and 3 are closed by the seawater armored door 4, pressure compensation is achieved via the exhaust device 5.

FIG. 3 shows the arrangement from the cold-sea subcooler 2 to the locking device of the inlet slot and the outlet slot 8; 3 via the inlet slot 8 and the seaboard armored door 4. .

FIG. 4 shows the possibility of direct heating of the seawater box 1 made via a hot-pipe bundle 9 integrated into a so-called combi-cooler of a high temperature circulation system or of a cooling water circulation system of a diesel generator having an inlet temperature of at least 70 ° C. . The principle configuration is made according to FIG. 1. The overheating of the local and time-limited short term in the case where the inlet and outlet slots 8 and 3 are closed at this time is such that the integrated hot pipe bundle 9 is the same as described in FIG. 5 below. In charge of the way.

5 shows an R & I-schematic diagram for an engine with separate hot- and cold-cooled water circulation systems. The hot-engine coolant is reversely cooled by the low temperature coolant during normal operation via the plate heat exchanger 14, which is again on its side with the inlet and outlet slots 8 and 3 open. The amount of heat received is discharged through the cold-sea water cooler (2).

In the harbor or on the berth, the superheating operation for the cold-sea water cooler 2 is started up to at least 60 ° C. which is necessary for killing the growing organism after the shutoff of the main engine 13. Bypass of the temperature control valve 16 is completely closed. The hot-cooling water thus heats the cold-cooling water through the plate heat exchanger 14. The seawater in the seawater box 1 is locally overheated by a cold-seawater cooler 2 for a short period of time, at least up to 60 ° C. by cold-cooled water circulating with the circulation system closed, thereby consequently Growing organisms die.

After the closed inlet and / or outlet slots 8; 3 are opened, the seawater 1 is cleaned for a short time via the cleaning connection 6, if necessary, and the cold seawater cooler 2 ) Is reverse guided back to normal operation in the reverse order by performing the aforementioned actions.

FIG. 5 also shows a proposal of how the heating time can be shortened by the heat exchanger 15 further integrated into the cold-circulation system and heated by steam, hot spring oil or electronic energy.

FIG. 6 shows a further embodiment of a movable resilient plate 17 which can be adapted to the outer skin of the ship, which serves as a watertight locking device for the inlet slot and the outlet slot 8; 3. The static pressure acting on the plate 17 from the outside presses the plate 17 onto the outer surface embodied by the double cover 18 in this region of the seawater 1.

FIG. 7 shows a seawater system consisting of seawater boxes 1A; 1B and operatively coupled with built-in shut-off armatures 21 and 22, pumps 20 and mixing tanks 19 through pipelines and / or channels. . In operation at sea, the armatures 21 and 22 and the armored doors 4A and 4B in the sea baths 1A and 1B are opened.

When the ship is decelerating at a port or berth or during a berth, the seawater system is opened by closing the armored door 4B in the seawater 1B and opening of the blocking armature 22B belonging to the seawater. And the passive partial system B by opening the armature 22A at the time of operation of the seawater 1A. At this time, the seawater 1B is locally restricted by the connecting pipeline, armatures 21B; 22B, the box cooler 2B, and the pump 20B belonging to it, and is heated for a short time, whereby microorganisms, large organisms and their Larvae growth is arrested.

After the cleaning operation in seawater 1B is terminated, the partial system is switched to seawater operation by opening the armored door 4B. The seawater 1A, previously operated in seawater operation, is now connected to the washing operation according to the method described above. At this time, the partial system A is likewise restricted locally to inhibit growth and overheated for a short time.

Other seawater vessels and pipelines functionally coupled to the seawater vessels can be protected from the growth of organisms in a sectioned manner in a similar manner.

Claims (13)

In order to prevent the growth of organisms, the incoming seawater is locally confined to the seawater vessel and overheated repeatedly for a short period of time and regularly, and the superheating operation is directly lowered to the hot-engine cooling water using a switching device in the cooling water system. The provision of seawater chillers (2) for seawater smallpox, shellfish and other growing organisms in seawater baths, in particular parts in seawater chillers, such as used in ships and offshore-platforms, where seawater is configured to overheat in seawater How to stop growth. The method of claim 1, Pipelines and channels operatively coupled to the seawater in a number of seawater (1A; 1B) seawater systems, and seawater coolers (2A; 2B), pumps (20A, 20B), and armatures (21A, 21B; 22A). By means of components integrated into the seawater system, such as 22B), the incoming seawater is regularly overheated for a short period of time and locally limited in section manner, thereby using the superheated inflow seawater to section the entire seawater system Protecting against organism growth. The method according to claim 1 or 2, Using integrated measurement and control systems and control devices to regularly and voluntarily perform and automatically monitor local overheating for short periods of time. The method according to any one of claims 1 to 3, Before or after the local overheating operation, the blocked inserts can be cleaned with bottled water via a cleaning connection (6). Apparatus for carrying out the method according to claim 1, wherein The seawater box 1 is provided with a discharge slot 3 and an inlet slot 8, which slots are arranged in the outer skin of the ship and are individually or commonly mechanically closed by the locking device 4. Device which can be. The method of claim 5, Individual seawater boxes (1A; 1B) of the seawater system and pipelines and channels connecting the seawater boxes, and seawater coolers (2A; 2B), pumps (20A; 20B), and armatures (21A, 21B; 22A; 22B). By forming a separate partial system of elements integrated into the seawater system, a short and locally limited, regular overheating of the incoming seawater is achieved, thereby allowing the entire seawater system to grow the organism in a sectioned manner. And device protected against. The method of claim 6, The partial system in which the partial system is operated (if the sea water box 1A is operated when operating at sea, the armored door 4A is opened, the blocking armature 21A is closed, and the sea water box 1B is not operated). If not, the blocking armature 21B is closed) and the inoperative partial system (if the seawater 1B does not operate during the wash operation, the armored door 4B is closed and the blocking armature 22B is opened). , The breaking armature (22A is open if the seawater 1A is activated). The method according to any one of claims 1 to 7, The locking device (4) is characterized in that the armored door. The method according to any one of claims 1 to 8, The locking device (4) is characterized in that the movable elastic plate (17). The method according to any one of claims 1 to 9, The device characterized in that the locking device (4) is operated by a separate or common drive device (10). The method according to any one of claims 1 to 10, The locking device (4) is characterized in that it is coated with a special material, in particular Teflon, which reduces the growth and friction of living things. The method according to any one of claims 1 to 11, In order to locally heat the incoming seawater quickly, an additional hot-pipe bundle (9) integrated in the hot-circulation system of the main engine (13) is provided in the seawater cooler (1). The method according to any one of claims 1 to 12, An additional special auxiliary device, in particular a steam distributor lancet, is incorporated in the seawater box (1).