Winding pipe type LNG (Liquefied Natural Gas) intermediate medium gasifier

Abstract

The utility model discloses a winding pipe type LNG (Liquefied Natural Gas) intermediate medium vaporizer, which relates to an LNG intermediate medium vaporizer and comprises a heat exchange cylinder, a seawater inlet is fixedly arranged at the upper end of the heat exchange cylinder, a seawater outlet is fixedly arranged at the lower end of the heat exchange cylinder, and a filtering mechanism is arranged in the seawater inlet and comprises a filter screen frame fixedly arranged in the seawater inlet. A seawater filter screen is fixedly installed on the filter screen frame, a movable shaft is rotationally installed in the middle of the filter screen frame, a rotating frame body is fixedly installed at the upper end of the movable shaft, a cleaning brush is fixedly installed on the rotating frame body, the tail end of the cleaning brush abuts against the surface of the seawater filter screen, and a driving mechanism is installed at the seawater outlet. According to the winding pipe type LNG intermediate medium gasifier, seawater can be filtered through the filtering mechanism, impurities are prevented from being attached to the surface of the heat transfer pipe bundle in the heat exchange cylinder, the heat exchange efficiency is guaranteed, the driving mechanism can drive the cleaning brush to rotate, and therefore the seawater filter screen is cleaned, and the risk that the seawater filter screen is blocked is reduced.

Description

Technical Field

[0001] This utility model relates to an LNG intermediate medium vaporizer, specifically a wound tube type LNG intermediate medium vaporizer. Background Technology

[0002] Intermediate medium vaporizers are important vaporization devices widely used in liquefied natural gas (LNG) receiving terminals. They use an intermediate medium as a heat transfer medium to transfer heat from sources such as seawater, hot water, or air to the LNG, thus achieving LNG vaporization.

[0003] Publication number CN106931306A discloses a wound-tube type LNG intermediate medium vaporizer, comprising a first shell and a second shell connected by a connecting pipe. The first shell is an LNG vaporizer employing a single-flow wound-tube heat exchanger structure for heat exchange between cryogenic LNG and saturated steam of the intermediate medium. The second shell is a heater using seawater as a heat source, employing a dual-flow wound-tube heat exchanger structure. This design solves the problems of high operating costs, low heat exchange efficiency, large footprint, and limited operating conditions inherent in traditional intermediate medium vaporizers.

[0004] The aforementioned device achieves the heating and vaporization of liquefied natural gas (LNG) through heat exchange between seawater and heat transfer tube bundles. However, the lack of necessary filtration equipment at the fluid inlet results in the seawater entering the cylinder carrying a large amount of impurities. These impurities easily adhere to the surface of the heat transfer tube bundles, thereby reducing heat transfer efficiency. This reduction in efficiency directly affects the vaporization efficiency of LNG, and consequently, the overall system performance. Utility Model Content

[0005] The purpose of this invention is to provide a wound tube type LNG intermediate medium vaporizer to solve the problem that impurities can easily adhere to the surface of the heat transfer tube bundle in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a spiral-wound LNG intermediate medium vaporizer, comprising a heat exchange cylinder, a seawater inlet fixedly installed at the upper end of the heat exchange cylinder, a seawater outlet fixedly installed at the lower end of the heat exchange cylinder, and connecting flanges fixedly installed on both the seawater inlet and the seawater outlet. A filtration mechanism is provided inside the seawater inlet, the filtration mechanism comprising a filter screen frame fixedly installed inside the seawater inlet, a seawater filter screen fixedly installed on the filter screen frame, a movable shaft rotatably installed at the middle position of the filter screen frame, a rotating frame fixedly installed at the upper end of the movable shaft, a cleaning brush fixedly installed on the rotating frame, with the end of the cleaning brush abutting against the surface of the seawater filter screen, and a driving mechanism installed at the seawater outlet.

[0007] Preferably, a slag discharge port is provided on the side wall of the seawater outlet, and the slag discharge port is located above the seawater filter screen, and a slag discharge pipe is fixedly installed inside the slag discharge port.

[0008] Preferably, a bearing is installed in the middle of the filter frame, and the movable shaft is rotatably installed in the middle of the filter frame via the bearing.

[0009] Preferably, the rotating frame is rotatably mounted above the filter screen frame via a movable shaft, the cleaning brush is rotatably mounted above the seawater filter screen via the rotating frame, and the slag discharge pipe is installed on the seawater inlet side via a slag discharge port.

[0010] Preferably, the drive mechanism includes a drainage pipe fixedly installed at the seawater outlet, a mounting base fixedly installed inside the drainage pipe, an impeller rotatably installed on the mounting base, an oblique hole provided on the mounting base, a protective sleeve fixedly installed between the mounting base and the filter screen frame, a drive shaft rotatably installed inside the protective sleeve, and a reducer provided on the drive shaft.

[0011] Preferably, a bearing is provided at the middle position of the mounting base, and the impeller is rotatably mounted on the mounting base through the bearing.

[0012] Preferably, one end of the drive shaft is fixedly mounted on the impeller, and the other end of the drive shaft is fixedly mounted on the drive shaft. The impeller is rotatably mounted inside the drainage pipe via the mounting base, with the oblique hole facing the impeller. A retainer is provided inside the protective sleeve, and the drive shaft is rotatably mounted inside the protective sleeve via the retainer.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. In this application, the seawater filter screen is installed at the seawater inlet via its filter screen frame. During operation, seawater flows into the heat exchange cylinder through the seawater inlet. During this process, the seawater needs to pass through the seawater filter screen on the filter screen frame to purify the seawater flowing into the heat exchange cylinder, preventing impurities from depositing on the surface of the heat transfer tube bundle, thereby ensuring that the heat exchange efficiency is maintained.

[0015] 2. In this application, the seawater discharged through the inclined holes impacts the impeller, causing it to rotate. Subsequently, the impeller's rotation drives the drive shaft, which, after being reduced in speed by a reducer, further drives the movable shaft to rotate. The rotational motion of the movable shaft is transmitted to the rotating frame, causing it to rotate as well. The movement of the rotating frame then causes the cleaning brush to adhere to the seawater filter screen for cleaning. This cleaning process effectively removes impurities from the filter screen, which are then discharged through the slag outlet, thereby reducing the possibility of clogging the seawater filter screen. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a partial structural schematic diagram of the present invention;

[0018] Figure 3 This is a schematic diagram of the filtration mechanism of this utility model;

[0019] Figure 4 This is a schematic diagram of the drive mechanism of this utility model.

[0020] The following are the labeling elements in the diagram: 1. Seawater inlet; 2. Heat exchanger cylinder; 3. Seawater outlet; 4. Connecting flange; 5. Filtration mechanism; 501. Filter screen frame; 502. Seawater filter screen; 503. Rotating frame; 504. Movable shaft; 505. Cleaning brush; 506. Slag discharge pipe; 507. Slag discharge port; 6. Drive mechanism; 601. Drainage pipe; 602. Mounting base; 603. Drive shaft; 604. Impeller; 605. Inclined hole; 606. Reducer; 607. Protective jacket. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figure 1 and Figure 2 As shown, this utility model provides a technical solution for a wound tube type LNG intermediate medium vaporizer, including a heat exchange cylinder 2. A seawater inlet 1 is fixedly installed at the upper end of the heat exchange cylinder 2, and a seawater outlet 3 is fixedly installed at the lower end of the heat exchange cylinder 2. Both the seawater inlet 1 and the seawater outlet 3 are fixedly installed with connecting flanges 4. A filter mechanism 5 is provided inside the seawater inlet 1, and a drive mechanism 6 is installed at the seawater outlet 3. The filter mechanism 5 can filter the seawater to prevent impurities from adhering to the surface of the heat transfer tube bundle inside the heat exchange cylinder 2, thus ensuring heat exchange efficiency. The drive mechanism 6 can drive the cleaning brush 505 to rotate, thereby cleaning the seawater filter screen 502 and reducing the risk of clogging of the seawater filter screen 502.

[0023] like Figure 2 and Figure 3As shown, the filtration mechanism 5 includes a filter screen frame 501 fixedly installed inside the seawater inlet 1, a seawater filter screen 502 fixedly installed on the filter screen frame 501, a movable shaft 504 rotatably installed at the middle position of the filter screen frame 501, a rotating frame 503 fixedly installed at the upper end of the movable shaft 504, a cleaning brush 505 fixedly installed on the rotating frame 503, and the end of the cleaning brush 505 abutting against the surface of the seawater filter screen 502. A slag discharge port 507 is opened on the side wall of the seawater outlet 3, and the slag discharge port 507 is located above the seawater filter screen 502. A slag discharge pipe 506 is fixedly installed inside the slag discharge port 507. A bearing is installed at the middle position of the filter screen frame 501, and the movable shaft 504 is rotatably installed at the middle position of the filter screen frame 501 through the bearing.

[0024] Specifically, a seawater filter screen 502 is installed on a filter frame 501, which is fixed at the seawater inlet 1. In actual use, seawater first enters the heat exchange cylinder 2 through this inlet 1. As the seawater passes through the inlet 1 and flows into the heat exchange cylinder 2, it must pass through the seawater filter screen 502 on the filter frame 501. This filters out impurities and particulate matter from the seawater, ensuring that only clean seawater can enter the heat exchange cylinder 2. In this way, it effectively prevents these impurities from adhering to the surface of the heat transfer tube bundle inside the heat exchange cylinder 2, thereby avoiding potential negative impacts on heat exchange efficiency and ensuring the efficient operation of the entire heat exchange system.

[0025] like Figure 2 and Figure 4 As shown, the drive mechanism 6 includes a drainage pipe 601 fixedly installed at the seawater outlet 3. A mounting base 602 is fixedly installed inside the drainage pipe 601. An impeller 604 is rotatably installed on the mounting base 602. An oblique hole 605 is provided on the mounting base 602. A protective sleeve 607 is fixedly installed between the mounting base 602 and the filter screen frame 501. A drive shaft 603 is rotatably installed inside the protective sleeve 607. A reducer 606 is provided on the drive shaft 603. A bearing is provided in the middle of the mounting base 602. The impeller 604 is rotatably installed on the mounting base 602 through the bearing.

[0026] Specifically, the seawater discharged through the inclined hole 605 impacts the impeller 604 with a certain force, causing it to rotate. As the impeller 604 rotates, it drives the connected drive shaft 603 to rotate as well. During rotation, the drive shaft 603 is reduced in speed by the reducer 606. The reduced-speed drive shaft 603 continues to transmit power, driving the movable shaft 504 to rotate. The rotation of the movable shaft 504 causes the connected rotating frame 503 to rotate as well. During rotation, the rotating frame 503 drives the cleaning brush 505 to rotate against the seawater filter screen 502. The rotation of the cleaning brush 505 effectively removes impurities and dirt from the surface of the seawater filter screen 502. These impurities and dirt generated during the cleaning process can be discharged outside the system through the slag discharge port 507, greatly reducing the possibility of clogging the seawater filter screen 502 and ensuring the smooth operation and efficiency of the entire system.

[0027] Working principle: The seawater filter screen 502 is installed inside the seawater inlet 1 through the filter screen frame 501. When in use, seawater enters the heat exchange cylinder 2 through the seawater inlet 1. When the seawater enters the heat exchange cylinder 2, it will pass through the seawater filter screen 502 on the filter screen frame 501, thereby filtering the seawater entering the heat exchange cylinder 2, preventing impurities from adhering to the surface of the heat transfer tube bundle inside the heat exchange cylinder 2, and ensuring heat exchange efficiency. When seawater is discharged through seawater outlet 3, it enters the upper part of drainage pipe 601. The seawater entering the upper part of drainage pipe 601 is discharged through inclined hole 605. The seawater discharged through inclined hole 605 impacts impeller 604, causing impeller 604 to rotate. After impeller 604 rotates, it drives drive shaft 603 to rotate. After being reduced by reducer 606, drive shaft 603 drives movable shaft 504 to rotate. After movable shaft 504 rotates, it drives rotating frame 503 to rotate. After rotating frame 503 rotates, it drives cleaning brush 505 to rotate against seawater filter screen 502, thereby cleaning seawater filter screen 502. Impurities generated during cleaning can be discharged through slag discharge port 507, reducing the risk of seawater filter screen 502 clogging.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A spiral-wound LNG intermediate medium vaporizer, comprising a heat exchange cylinder (2), wherein a seawater inlet (1) is fixedly installed at the upper end of the heat exchange cylinder (2), and a seawater outlet (3) is fixedly installed at the lower end of the heat exchange cylinder (2), wherein a connecting flange (4) is fixedly installed on both the seawater inlet (1) and the seawater outlet (3), characterized in that: A filtration mechanism (5) is provided inside the seawater inlet (1). The filtration mechanism (5) includes a filter screen frame (501) fixedly installed inside the seawater inlet (1). A seawater filter screen (502) is fixedly installed on the filter screen frame (501). A movable shaft (504) is rotatably installed in the middle of the filter screen frame (501). A rotating frame (503) is fixedly installed at the upper end of the movable shaft (504). A cleaning brush (505) is fixedly installed on the rotating frame (503), and the end of the cleaning brush (505) abuts against the surface of the seawater filter screen (502). A drive mechanism (6) is installed at the seawater outlet (3).

2. The spiral-wound tubular LNG intermediate medium vaporizer according to claim 1, characterized in that: A slag discharge port (507) is provided on the side wall of the seawater outlet (3), and the slag discharge port (507) is located above the seawater filter screen (502). A slag discharge pipe (506) is fixedly installed inside the slag discharge port (507).

3. The spiral-wound tubular LNG intermediate medium vaporizer according to claim 2, characterized in that: A bearing is installed in the middle of the filter frame (501), and the movable shaft (504) is rotatably installed in the middle of the filter frame (501) via the bearing.

4. The spiral-wound tubular LNG intermediate medium vaporizer according to claim 3, characterized in that: The rotating frame (503) is rotatably mounted above the filter screen frame (501) via the movable shaft (504), the cleaning brush (505) is rotatably mounted above the seawater filter screen (502) via the rotating frame (503), and the slag discharge pipe (506) is installed on the side of the seawater inlet (1) via the slag discharge port (507).

5. The spiral-wound tubular LNG intermediate medium vaporizer according to claim 4, characterized in that: The drive mechanism (6) includes a drainage pipe (601) fixedly installed at the seawater outlet (3), a mounting base (602) fixedly installed inside the drainage pipe (601), an impeller (604) rotatably installed on the mounting base (602), an oblique hole (605) opened on the mounting base (602), a protective sleeve (607) fixedly installed between the mounting base (602) and the filter frame (501), a drive shaft (603) rotatably installed inside the protective sleeve (607), and a reducer (606) provided on the drive shaft (603).

6. The spiral-wound tubular LNG intermediate medium vaporizer according to claim 5, characterized in that: The mounting base (602) is provided with a bearing in the middle position, and the impeller (604) is rotatably mounted on the mounting base (602) through the bearing.

7. The spiral-wound tubular LNG intermediate medium vaporizer according to claim 6, characterized in that: One end of the drive shaft (603) is fixedly mounted on the impeller (604), and the other end of the drive shaft (603) is fixedly mounted on the drive shaft (603). The impeller (604) is rotatably mounted in the drainage pipe (601) through the mounting base (602), and the oblique hole (605) faces the impeller (604). A retainer is provided in the protective sleeve (607), and the drive shaft (603) is rotatably mounted in the protective sleeve (607) through the retainer.

Images