KR102150459B1 - Glycol Water Supply System for FLNG Marine Vessel - Google Patents

Abstract

The present invention relates to a glycol water system of a FLNG ship, and by arranging the glycol water system of a FLNG ship in a machine room formed under the main deck, it is possible to improve the space efficiency above the main deck and reduce the distance to the cofferdam. It can reduce the amount of glycol water loss caused by evaporation during the circulation of glycol water, enabling more efficient operation, and installing a partial deck and support frame in the interior space of the machine room of the hull, and using the partial deck and support frame. By arranging the components to have a height difference according to the function, a stable system operation is possible, and a glycol water system of a FLNG vessel is provided that can further improve the space efficiency for the space inside the machine room.

Description

Glycol Water Supply System for FLNG Marine Vessel}

The present invention relates to a glycol water system for FLNG vessels. More specifically, by arranging the glycol water system of the FLNG ship in the machine room formed under the main deck, space efficiency on the upper part of the main deck can be improved, and the distance to the cofferdam can be reduced, thereby evaporating the glycol water during circulation. It is possible to reduce the amount of glycol water loss that occurs, enabling more efficient operation, installing a partial deck and support frame in the interior space of the machine room of the hull, and adjusting the height difference of each component according to the function using the partial deck and support frame. By arranging so as to have, it is possible to operate a stable system, and to a glycol water system of a FLNG ship that can further improve the space efficiency for the space inside the machine room.

In general, LNG carriers and FLNG (Floating Liquid Natural Gas Plant) ships have cryogenic cargo holds capable of storing LNG in the lower space of the hull, and these cargo holds are separated by a number of divisions through a cofferdam. Is formed. At this time, since LNG, which is a cryogenic fluid, is stored in the cargo hold, the cofferdam can be cooled to a cryogenic state by heat transfer from the LNG. The cofferdam needs to be heated to prevent excessive cooling of the cofferdam, and a glycol water system is used as such a heating device.

The Glycol Water System performs the function of maintaining thermal stability of the cofferdam by preventing excessive cooling of the cofferdam by heating the cofferdam by circulating glycol water, which is a heating fluid mixed with water and pure glycol, to the cofferdam. do.

Such a glycol water system includes a number of components such as a reserve tank, a mixing tank, an expansion tank, a circulation pump and a heater, etc., and takes up considerable space to construct such a system.

In general, in the case of an LNG carrier, a gas compressor room is usually formed on the main deck, and the glycol water system is arranged in such a gas compressor room, and design work is proceeded to be advantageous in terms of the distance from the cofferdam and the layout space. do.

However, in the case of FLNG ships, since gas processing devices such as a process module, a laydown area and a flare tower are arranged on the main deck, a space such as a gas compressor room is secured separately. It is impossible. Therefore, it was very difficult to arrange a glycol water system in FLNG ships. In particular, considering that the amount of glycol water circulating through the glycol water system is reduced due to leakage or evaporation during circulation, the glycol water system is It is desirable to form the distance to the cofferdam as close as possible, but it was very difficult to arrange the glycol water system to satisfy these conditions.

In some FLNG ships, the glycol water system is sometimes placed in the residence area located on the main deck, but this caused inconvenience in that the living environment was greatly deteriorated due to noise generated during system operation, and the distance from the cofferdam Even when considering the side, there was a problem that it was quite disadvantageous.

Domestic Patent Registration No. 10-1313161

The present invention was invented to solve the problems of the prior art, and an object of the present invention is to improve the space efficiency above the main deck by arranging the glycol water system of the FLNG ship in a machine room formed under the main deck, and It is to provide a glycol water system for FLNG vessels capable of more efficient operation by reducing the distance to the dam and reducing the amount of glycol water loss caused by evaporation during the circulation of glycol water.

Another object of the present invention is to manufacture a reserve tank storing pure glycol in the form of a hull tank that forms the frame of the hull together with the main deck, so that a separate installation work for the reserve tank is not required, as well as a separate for supporting the reserve tank. Since the supporting structure of the device is also unnecessary, the installation work of the glycol water system is simplified and the glycol water system of the FLNG ship is provided that can improve the space efficiency for the space inside the machine room.

Another object of the present invention is to install a partial deck and a support frame in the space inside the machine room of the hull, and by using the partial deck and support frame to arrange each component to have a height difference according to the function, it is possible to operate a stable system. And, it is to provide a glycol water system for FLNG ships that can further improve the space efficiency for the space inside the machine room.

The present invention provides a glycol water system of an FLNG ship for circulating and supplying glycol water to a cofferdam formed between a cargo hold of an FLNG ship, comprising: a reserve tank for storing pure glycol; A mixing tank connected to the reserve tank to produce glycol water by mixing pure glycol and water; An expansion tank connected to the reserve tank and the mixing tank so that glycol water may be filled; A circulation pump receiving glycol water from the expansion tank and circulating and supplying glycol water to the cofferdam through a separate circulation pipe; And a heater for heating glycol water supplied from the circulation pump to the cofferdam, wherein the reserve tank, mixing tank, expansion tank, circulation pump, and heater are disposed in a space inside the machine room formed under the main deck of the hull, It provides a glycol water system of a FLNG vessel, characterized in that it is arranged to have a height difference according to each function.

At this time, the expansion tank may be disposed at a higher position than the circulation pump so that glycol water can be supplied from the expansion tank to the circulation pump by its own weight.

In addition, a separate partial deck is installed inside the machine room, and some of the reserve tank, mixing tank, expansion tank, circulation pump, and heater may be disposed to be seated and supported on the partial deck.

In addition, the partial deck may be installed to be positioned above the top horizontal flat among a plurality of horizontal flats formed to form a plurality of layers inside the machine room.

In addition, the mixing tank and heater may be seated and supported on the partial deck, the circulation pump may be seated and supported on the uppermost horizontal flat, and the expansion tank may be disposed to be positioned above the partial deck.

In addition, a separate support frame protruding upward is installed on the upper surface of the partial deck, and the expansion tank may be seated and supported on the support frame.

In addition, the reserve tank may be integrally formed with the main deck in the form of a hull tank protruding downward from the lower surface of the main deck to the inner space of the machine room so as to form the basic frame of the hull together with the main deck.

In addition, the expansion tank may be equipped with a water level sensor capable of detecting the level of the glycol water stored therein.

In addition, a pump connection port may be formed in a connection pipe connecting the reserve tank and the expansion tank to pump and supply pure glycol from the reserve tank to the expansion tank using a portable pump.

In addition, an opening/closing valve may be mounted on a connection pipe connecting the reserve tank and the expansion tank to supply or block pure glycol from the reserve tank to the expansion tank according to a signal from the water level sensor.

According to the present invention, by arranging the glycol water system of the FLNG ship in the machine room formed under the main deck, it is possible to improve the space efficiency above the main deck, and reduce the distance from the cofferdam to evaporate during the circulation of glycol water. It is possible to reduce the amount of loss of glycol water caused by it, thereby enabling more efficient operation.

In addition, by manufacturing the reserve tank storing pure glycol in the form of a hull tank that forms the frame of the hull together with the main deck, a separate installation work for the reserve tank is not required, as well as a separate support structure to support the reserve tank. Since it is unnecessary, there is an effect of simplifying the installation work of the glycol water system and improving the space efficiency for the space inside the machine room.

In addition, by installing a partial deck and a support frame in the space inside the machine room of the hull, and by arranging each component to have a height difference according to the function using the partial deck and support frame, stable system operation is possible and the space inside the machine room There is an effect that can further improve the space efficiency for.

1 is a diagram schematically showing an arrangement of a glycol water system of a FLNG vessel according to an embodiment of the present invention;
2 is an enlarged view of a portion "A" shown in FIG. 1;
3 is a conceptual diagram schematically showing the configuration of a glycol water system of a FLNG vessel according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to elements of each drawing, it should be noted that the same elements have the same numerals as possible, even if they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the subject matter of the present invention, a detailed description thereof will be omitted.

1 is a view schematically showing an arrangement of a glycol water system of a FLNG vessel according to an embodiment of the present invention, FIG. 2 is an enlarged view of a portion "A" shown in FIG. 1, and FIG. 3 is It is a conceptual diagram schematically showing the configuration of the glycol water system of the FLNG ship according to an embodiment of the present invention.

The glycol water system 50 disposed in the FLNG ship according to an embodiment of the present invention is a system for circulating and supplying glycol water to the cofferdam 40 formed in the space between the cargo hold 30 of the FLNG ship, and the reserve tank 100 ), a mixing tank 200, an expansion tank 300, a circulation pump 400, and a heater 500.

Such a glycol water system 50 is disposed in the interior space of the machine room 10 formed under the main deck 20 of the hull as shown in FIGS. 1 and 2.

According to this structure, since the glycol water system 50 does not have to be disposed in the upper space of the main deck 20 in the FLNG ship, space utilization for the upper space of the main deck is further improved. In addition, the machine room 10 is a space formed on the lower stern side of the main deck 20, and the cargo hold 30 and cofferdam 40 of the FLNG ship are also spaces formed under the main deck 20, so glycol When the water system 50 is disposed in the interior space of the machine room 10, the distance between the glycol water system 50 and the cofferdam 40 can be kept relatively close, so that the amount of glycol water loss of the glycol water system 50 Can be reduced.

That is, as described in the background art, the glycol water system 50 naturally loses glycol water due to evaporation in the process of circulating glycol water, and is configured to continuously supply the lost amount. When the glycol water system 50 according to an embodiment is disposed in the interior space of the machine room 10 and the distance to the cofferdam 40 is relatively close, the circulation supply path of glycol water through the glycol water system 50 is As a result, the amount of evaporation of glycol water decreases during the circulation supply process, thereby reducing the amount of glycol water loss. Therefore, the glycol water system 50 can be operated more efficiently and stably.

The glycol water system 50 is preferably disposed on the upper floor in the interior space of the machine room 10 in order to further close the distance to the cofferdam 40. That is, the glycol water supplied to the cofferdam 40 flows from the upper layer to the lower layer in the cofferdam 40 and is configured to heat the cofferdam 40, so the heated water supplied to the cofferdam 40 It is preferable that the glycol water system 50 is located on the upper floor in the inner space of the machine room 10 so that the glycol water in the state is supplied to the cofferdam 40 along a shorter supply path.

As described above, the glycol water system 50 includes a reserve tank 100, a mixing tank 200, an expansion tank 300, a circulation pump 400, and a heater 500 for circulation supply of glycol water. However, the components of the glycol water system 50 are all disposed in the interior space of the machine room 10. Hereinafter, each of these configurations will be described in more detail.

The reserve tank 100 is a tank that stores pure glycol.

The mixing tank 200 is connected to the reserve tank 100 to generate glycol water by mixing pure glycol and water. That is, the mixing tank 200 is connected to the reserve tank 100 to receive pure glycol from the reserve tank 100 and at the same time receive water through a separate pump (not shown), and mix the pure glycol and water. It is configured to generate glycol water and store it in the interior space.

The expansion tank 300 is connected to the reserve tank 100 and the mixing tank 200, respectively, receives and stores glycol water, and supplies glycol water to a circulation pump 400 to be described later. That is, the glycol water circulated and supplied to the cofferdam 40 by the circulation pump 400 is partially lost due to evaporation or the like in the circulation process, and when such loss occurs, the circulation pump from the expansion tank 300 to preserve the loss amount. Glycol water is supplied at 400. At this time, the expansion tank 300 is preferably disposed at a higher position than the circulation pump 400 so that glycol water can be supplied from the expansion tank 300 to the circulation pump 400 by its own weight.

In other words, since the loss amount of glycol water circulated and supplied to the cofferdam 40 by the circulation pump 400 is always preserved by the expansion tank 300, a certain amount of glycol water is continuously maintained by the circulation pump 400. Circulation is supplied. Therefore, in the expansion tank 300, a certain amount or more of glycol water must always be maintained in order to preserve the loss of glycol water to the circulation pump 400, and for this purpose, the expansion tank 300 includes the reserve tank 100 and the mixing tank ( 200) to receive glycol water.

A separate supply pump 210 may be installed in a pipe connecting the expansion tank 300 and the mixing tank 200, and glycol water is transferred from the mixing tank 200 to the expansion tank 300 through the supply pump 210. ) Can be supplied. On the other hand, the connection pipe (P2) connecting the expansion tank 300 and the reserve tank 100 is a portable pump so that pure glycol can be pumped and supplied to the expansion tank 300 as needed by using a separate portable pump 700. A pump connection port P3 to which 700 can be connected may be formed.

In this way, the expansion tank 300 is connected to the mixing tank 200 and the reserve tank 100, respectively, and when a relatively large amount of glycol water is to be supplied to the expansion tank 300, the expansion tank 300 expands from the mixing tank 200. When glycol water is supplied to the tank 300 and a relatively small amount of glycol water is to be replenished in the expansion tank 300, pure glycol is supplied from the reserve tank 100 to the expansion tank 300. can do. For example, when a large amount of glycol water is supplied while the expansion tank 300 is empty, glycol water is supplied from the mixing tank 200, and glycol water is used to preserve the amount of loss lost in the circulation of the glycol water. In the case of adding a small amount, pure glycol may be supplied from the reserve tank 100 to the expansion tank 300.

The circulation pump 400 receives glycol water from the expansion tank 300 and circulates and supplies glycol water to the cofferdam 40 through a separate circulation pipe P1.

The heater 500 is mounted on the circulation pipe P1 to heat the glycol water supplied from the circulation pump 400 to the cofferdam 40.

According to this structure, glycol water supplied from the expansion tank 300 to the circulation pump 400 is supplied to the cofferdam 40 along the circulation pipe P1, and to the cofferdam 40 along the circulation pipe P1. In the process of being supplied, it is supplied to the cofferdam 40 in a heated state by the heater 500. The glycol water heated in this way is supplied to the cofferdam 40 to prevent excessive cooling of the cofferdam 40 through heat exchange with the cofferdam 40. After passing through the cofferdam 40, the glycol water cooled by heat exchange with the cofferdam 40 flows back into the circulation pump 400 and is recycled in the same manner. At this time, the glycol water passing through the cofferdam 40 may be directly introduced into the circulation pump 400, but may also be introduced into the expansion tank 300, in this case, the circulation pump 400 continuously from the expansion tank 300 ) Is supplied with glycol water and is configured to be circulated and supplied by the circulation pump 400.

The glycol water system 50 including the reserve tank 100, the mixing tank 200, the expansion tank 300, the circulation pump 400, and the heater 500 described above, as described above, evaporation loss of glycol water It is desirable to be disposed in the inner space of the machine room 10 so that the distance to the cofferdam 40 is close to the inner space of the machine room 10, but in order to make the distance to the cofferdam 40 closer, the inside of the machine room 10 It is preferable to be located in the upper part of the space.

That is, the circulation pipe P1 connected from the circulation pump 400 to the cofferdam 40 to supply glycol water is connected to the upper side of the cofferdam 40 so that the glycol water is at the upper side of the cofferdam 40 In order to minimize the supply path of the circulation pipe (P1) so as to minimize the evaporation loss of glycol water in the process of supplying the glycol water to the cofferdam (40) of the glycol water, the glycol water system 50 is installed in the machine room. It is preferable to arrange it in the upper part of the inner space of (10). In addition, the glycol water system 50 is preferably disposed on the bow side in the inner space of the machine room 10, through which it is located at a position closer to the cargo hold 30 and the cofferdam 40 based on the longitudinal direction of the hull. In the process of supplying glycol water, evaporation loss can be further prevented.

On the other hand, each component constituting the glycol water system 50, that is, the reserve tank 100, the mixing tank 200, the expansion tank 300, the circulation pump 400, and the heater 500, the machine room 10 It is arranged in the interior space, and at this time, it is arranged to have a height difference according to each function.

For example, the reserve tank 100 and the expansion tank 300 are preferably disposed at a position higher than the uppermost height of the circulation pipe P1 so that glycol water can stably circulate by the circulation pump 400. . In addition, as described above, the expansion tank 300 is preferably located at a higher position than the circulation pump 400 so that glycol water can be supplied from the expansion tank 300 to the circulation pump 400 by its own weight.

In more detail, in the interior space of the machine room 10, a plurality of horizontal flats 11 are formed vertically apart to form a horizontal layer, respectively, and the glycol water system 50 is a horizontal flat of the uppermost layer among these horizontal flats 11. It can be formed to be supported by (11).

At this time, a separate partial deck 600 may be installed on the uppermost horizontal flat 11 to be located on the upper layer from the uppermost horizontal flat 11, and each component of the glycol water system 50 is such an uppermost horizontal flat. (11) and using the partial deck 600 may be disposed to have a height difference, respectively.

For example, the mixing tank 200, the supply pump 210, and the heater 500 are arranged to be seated and supported on the partial deck 600, and the circulation pump 400 is seated and supported on the uppermost horizontal flat 11 The expansion tank 300 may be disposed to be located above the partial deck 600. At this time, a separate support frame 610 protruding upward may be installed on the upper surface of the partial deck 600, and the expansion tank 300 may be seated and supported on the support frame 610. In this case, the support frame 610 is preferably formed to have an upward protruding height that can be positioned higher than the uppermost height of the expansion tank 300 of the circulation pipe (P1).

On the other hand, when the amount of glycol water circulated by the circulation pump 400 decreases due to evaporation loss or the like, glycol water is supplied from the expansion tank 300 to the circulation pump 400 by its own weight as described above, Accordingly, glycol water must be supplemented in the expansion tank 300 as well. In this case, pure glycol may be supplemented and supplied to the expansion tank 300 from the reserve tank 100 as described above.

At this time, the pure glycol may be supplied from the reserve tank 100 to the expansion tank 300 by its own weight. To this end, the reserve tank 100 must be positioned higher than the expansion tank 300, and more specifically The lower end of the reserve tank 100 must be located at a higher position than the upper end of the expansion tank 300. In this case, in the connection pipe P2 connecting the reserve tank 100 and the expansion tank 300, a separate opening/closing valve (not shown) so that pure glycol can be supplied or blocked from the reserve tank 100 to the expansion tank 300. City) can be installed.

In contrast, the reserve tank 100 and the expansion tank 300 may be disposed in the same height section in order to effectively utilize the space inside the machine room 10. In this case, a separate portable pump 700 may be used to supply pure glycol from the reserve tank 100 to the expansion tank 300, at this time, a connection connecting the reserve tank 100 and the expansion tank 300 A pump connection port P3 through which the portable pump 700 can be connected may be formed in the pipe 210.

In addition, the expansion tank 300 may be equipped with a water level detector (not shown) capable of detecting the storage height of the glycol water stored therein, and opening/closing of the above-described connection pipe 210 according to a signal from the water level sensor. It may be configured in a way to operate a valve (not shown) or a portable pump 700.

On the other hand, the reserve tank 100 has to be located higher than the other components of the glycol water system 50 in the interior space of the machine room 10, and in order to position the reserve tank 100 on the top floor, a separate support There may be problems such as inconvenient work, such as having to install a structure, and a decrease in space efficiency for the interior space of the machine room 10. Therefore, the reserve tank 100 is in the form of a hull tank protruding downward from the lower surface of the main deck 20 to the inner space of the machine room 10 so as to form the basic frame of the hull together with the main deck 20 according to an embodiment of the present invention. It may be formed integrally with the low main deck (20).

According to this configuration, a separate installation work for the reserve tank 100 is not required, and a separate support structure for supporting the reserve tank 100 is not required, so the installation work of the glycol water system 50 is simplified and the machine room (10) It is possible to improve the space efficiency for the internal space.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

10: machine room 20: main deck
30: cargo hold 40: cofferdam
50: glycol water system 100: reserve tank
200: mixing tank 300: expansion tank
400: circulation pump 500: heater
600: partial deck 610: support frame
700: portable pump

Claims (10)

In the glycol water system of the FLNG ship, which circulates glycol water to the cofferdam formed between the cargo hold of the FLNG ship,
A reserve tank for storing pure glycol;
A mixing tank connected to the reserve tank to produce glycol water by mixing pure glycol and water;
An expansion tank connected to the reserve tank and the mixing tank so that glycol water may be filled;
A circulation pump receiving glycol water from the expansion tank and circulating and supplying glycol water to the cofferdam through a separate circulation pipe; And
And a heater for heating the glycol water supplied from the circulation pump to the cofferdam, and the reserve tank, mixing tank, expansion tank, circulation pump, and heater are disposed in a space inside the machine room formed under the main deck of the hull, respectively It is arranged to have a height difference according to the function of;
The glycol water system of a FLNG vessel, wherein the expansion tank is disposed at a higher position than the circulation pump so that glycol water can be supplied from the expansion tank to the circulation pump by its own weight. delete The method of claim 1,
A separate partial deck is installed inside the machine room, and some of the reserve tank, mixing tank, expansion tank, circulation pump, and heater are disposed to be seated and supported on the partial deck. The method of claim 3,
The partial deck is a glycol water system of a FLNG vessel, characterized in that it is installed to be located above the uppermost horizontal flat of a plurality of horizontal flats formed to form a plurality of layers inside the machine room. The method of claim 4,
The mixing tank and the heater are seated and supported on the partial deck, the circulation pump is seated and supported on the uppermost horizontal flat, and the expansion tank is arranged to be located above the partial deck. system. The method of claim 5,
A separate support frame protruding upward is installed on the upper surface of the partial deck, and the expansion tank is seated and supported on the support frame. The method according to any one of claims 1 and 3 to 6,
The reserve tank is formed integrally with the main deck in the form of a hull tank protruding downward from the lower surface of the main deck to the inner space of the machine room so as to form the basic frame of the hull together with the main deck. system. The method of claim 7,
The glycol water system of a FLNG vessel, characterized in that the expansion tank is equipped with a water level detector capable of detecting the level of the glycol water stored therein. The method of claim 8,
A glycol water system of an FLNG vessel, characterized in that a pump connection port is formed in a connection pipe connecting the reserve tank and the expansion tank to pump and supply pure glycol from the reserve tank to the expansion tank using a portable pump. The method of claim 8,
Glycol water of a FLNG vessel, characterized in that an opening/closing valve is mounted on a connection pipe connecting the reserve tank and the expansion tank to supply or block pure glycol from the reserve tank to the expansion tank according to a signal from the water level sensor. system.

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