A liquefied natural gas BOG recondenser

Abstract

The utility model relates to a kind of liquefied natural gas BOG recondenser, including condensing tank, the bottom of condensing tank is fixedly connected with a pair of support block, and the inner wall of condensing tank is fixedly connected with partition, the bottom of partition is fixedly connected with heat insulating layer, heat exchange tube is equipped in condensing tank, one end of heat exchange tube penetrates the side wall of condensing tank, and the other end of heat exchange tube penetrates partition and heat insulating layer, and penetrates the side wall of condensing tank, the top of condensing tank is fixedly connected with water pipe, and the both sides of condensing tank are fixedly connected with natural gas conduit and drain pipe respectively, and the bottom of condensing tank is fixedly connected with natural gas discharge pipe, the bottom of a pair of support block is fixedly connected with bottom plate, anti-skid line is opened in the bottom of bottom plate, by a series of structures, so that the present technical scheme has the characteristics of reducing temperature difference, improving device stability.

Description

Technical Field

[0001] This utility model relates to the field of BOG recondenser technology, specifically to a liquefied natural gas BOG recondenser. Background Technology

[0002] Liquefied natural gas (LNG) is a liquefied natural gas product stored and transported at normal pressure and low temperature (101.3 kPa, -162°C). During production, storage, and transportation, LNG inevitably exchanges heat with the external environment, causing its temperature to rise and some of the liquid gas to evaporate, forming BOG flash vapor. BOG formation increases the pressure in storage containers; excessive pressure may cause safety valves to open, increasing the risk of explosion. Directly releasing BOG into the atmosphere results in energy waste and increased environmental burden. Therefore, the proper handling of BOG directly affects the stability, safety, and economy of daily operations. Currently, the most common BOG processing technology is BOG reliquefaction, where BOG is compressed and pressurized by a compressor, then mixed with subcooled LNG in a recondenser for reliquefaction before being exported. The equipment for this process mainly involves BOG compressors and recondensers.

[0003] In existing BOG recondensers, liquefied natural gas and BOG vapor are directly discharged into the condenser. However, the two gases have large temperature differences and large pressure variations, making it difficult to accurately control the internal pressure of the recondenser. Therefore, in order to correct the above defects, we propose a liquefied natural gas BOG recondenser. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this application proposes a liquefied natural gas BOG recondenser. Through a series of structural features, this technical solution reduces temperature differences and improves the stability of the equipment.

[0005] This utility model provides the following technical solution: a liquefied natural gas (BOG) recondenser, comprising a condenser tank, a pair of support blocks fixedly connected to the bottom of the condenser tank, a partition plate fixedly connected to the inner wall of the condenser tank, a heat insulation layer fixedly connected to the bottom of the partition plate, a heat exchange tube provided inside the condenser tank, one end of the heat exchange tube penetrating the side wall of the condenser tank, and the other end of the heat exchange tube penetrating the partition plate and the heat insulation layer, and penetrating the side wall of the condenser tank, a water inlet pipe fixedly connected to the top of the condenser tank, a natural gas conduit pipe and a drain pipe fixedly connected to both sides of the condenser tank respectively, and a natural gas outlet pipe fixedly connected to the bottom of the condenser tank.

[0006] As a preferred embodiment of this utility model, a base plate is fixedly connected to the bottom of the pair of support blocks, and the bottom of the base plate is provided with anti-slip texture.

[0007] As a preferred embodiment of this utility model, an air pump is fixedly connected to the side wall of one of the support blocks. An air pump is fixedly connected to an air suction pipe and an air outlet pipe. The other end of the air suction pipe is fixedly connected to the lower end of the heat exchange tube, and the other end of the air outlet pipe is fixedly connected to the upper end of the heat exchange tube.

[0008] As a preferred embodiment of this utility model, valves are installed at both ends of the heat exchange tube, valves are installed on the natural gas conduit, and valves are installed on the suction pipe and the outlet pipe.

[0009] As a preferred embodiment of this utility model, a drain plate is fixedly connected to the water supply pipe, and a plurality of dispersion holes are opened at the bottom of the drain plate.

[0010] As a preferred embodiment of this utility model, the heat exchange tube is arranged in a spiral.

[0011] The beneficial effects of this utility model are: 1. By setting up a water inlet pipe, a drain pan, a dispersion hole, and a heat exchange tube, cold water is added through the water inlet pipe and dispersed to the top of the condenser through the dispersion hole below the drain pan. At the same time, BOG vapor is discharged into the heat exchange tube, and then the BOG vapor in the heat exchange tube is initially cooled by the cold water, which reduces the temperature difference between BOG vapor and LNG gas, reduces pressure changes, and thus improves the working stability of the condenser. 2. By setting up an air intake pump, air intake pipe, air outlet pipe and heat exchange pipe, when BOG vapor condensation is incomplete, close the valve at the bottom of the heat exchange pipe and open the valve on the air intake pipe, then start the air intake pump. The air intake pump draws in BOG vapor through the air intake pipe and reintroduces it to the top of the heat exchange pipe through the air outlet pipe, thereby carrying out continuous heat exchange to improve the condensation effect of BOG vapor. Attached Figure Description

[0012] Figure 1 This is a partial three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the overall structure of this utility model; Figure 3 A bottom view of the drain pan and dispersion holes; Figure 4 A three-dimensional view of the drainage tray and dispersion holes.

[0013] In the diagram: 1. Condensate tank; 2. Support block; 3. Partition plate; 4. Insulation layer; 5. Heat exchange tube; 6. Water supply pipe; 7. Natural gas conduit; 8. Drain pipe; 9. Natural gas discharge pipe; 10. Base plate; 11. Suction pump; 12. Suction pipe; 13. Gas outlet pipe; 14. Drain tray; 15. Dispersion hole. Detailed Implementation

[0014] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. Example

[0015] like Figures 1 to 4 As shown, a liquefied natural gas (LNG) BOG recondenser includes a condenser tank 1. A pair of support blocks 2 are fixedly connected to the bottom of the condenser tank 1, and a partition plate 3 is fixedly connected to the inner wall of the condenser tank 1. A heat insulation layer 4 is fixedly connected to the bottom of the partition plate 3. A heat exchange tube 5 is provided inside the condenser tank 1. One end of the heat exchange tube 5 penetrates the side wall of the condenser tank 1, and the other end of the heat exchange tube 5 penetrates the partition plate 3 and the heat insulation layer 4, and also penetrates the side wall of the condenser tank 1. A water supply pipe 6 is fixedly connected to the top of the condenser tank 1, and a natural gas conduit 7 and a drain pipe 8 are fixedly connected to both sides of the condenser tank 1, respectively. A natural gas discharge pipe 9 is fixedly connected to the bottom of the condenser tank 1.

[0016] In this embodiment, when BOG vapor condensation is incomplete, the valve at the bottom of the heat exchange tube 5 is closed and the valve on the suction pipe 12 is opened, and then the suction pump 11 is started. The suction pump 11 draws in BOG vapor through the suction pipe 12 and reintroduces it into the upper end of the heat exchange tube 5 through the outlet pipe 13, thereby performing continuous heat exchange to improve the condensation effect of BOG vapor. A base plate 10 is fixedly connected to the bottom of a pair of support blocks 2. The bottom of the base plate 10 is provided with anti-slip texture. The suction pump 11 is fixedly connected to the side wall of one of the support blocks 2. The suction pump 11 is fixedly connected to the suction pipe 12 and the outlet pipe 13. The other end of the suction pipe 12 is fixedly connected to the lower end of the heat exchange tube 5, and the other end of the outlet pipe 13 is fixedly connected to the upper end of the heat exchange tube 5.

[0017] In this embodiment, the output of gas and its opening and closing can be controlled by valves. Valves are installed at both ends of the heat exchange tube 5, valves are installed on the natural gas conduit 7, valves are installed on the intake pipe 12 and the outlet pipe 13, and a drain plate 14 is fixedly connected to the water supply pipe 6. Several dispersion holes 15 are opened at the bottom of the drain plate 14, and the heat exchange tube 5 is arranged in a spiral.

[0018] Working principle: During use, cold water is added through the water inlet pipe 6 and dispersed through the dispersion hole 15 below the drain pan 14 to the top of the condenser tank 1. At the same time, BOG vapor is discharged into the heat exchange tube 5. The cold water then provides initial cooling to the BOG vapor in the heat exchange tube 5, reducing the temperature difference between the BOG vapor and LNG gas, reducing pressure changes, and thus improving the working stability of the condenser tank 1. After cooling, the BOG vapor continues to flow into the lower inner cavity of the condenser tank 1, and then LNG gas is discharged through the natural gas conduit 7. The low-temperature LNG gas continues to exchange heat with the BOG vapor in the heat exchange tube 5, thereby condensing the BOG vapor. When the BOG vapor is not completely condensed, the valve at the bottom of the heat exchange tube 5 is closed and the valve on the suction pipe 12 is opened. Then, the suction pump 11 is started. The suction pump 11 draws in BOG vapor through the suction pipe 12 and reintroduces it to the upper end of the heat exchange tube 5 through the outlet pipe 13, thereby continuously exchanging heat to improve the condensation effect of the BOG vapor.

[0019] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0020] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A liquefied natural gas BOG recondenser, characterized in that, The condenser includes a condenser (1), a pair of support blocks (2) are fixedly connected to the bottom of the condenser (1), and a partition plate (3) is fixedly connected to the inner wall of the condenser (1). A heat insulation layer (4) is fixedly connected to the bottom of the partition plate (3). A heat exchange tube (5) is provided inside the condenser (1). One end of the heat exchange tube (5) penetrates the side wall of the condenser (1), and the other end of the heat exchange tube (5) penetrates the partition plate (3) and the heat insulation layer (4), and also penetrates the side wall of the condenser (1). A water supply pipe (6) is fixedly connected to the top of the condenser (1), and a natural gas conduit (7) and a drain pipe (8) are fixedly connected to both sides of the condenser (1), respectively. A natural gas discharge pipe (9) is fixedly connected to the bottom of the condenser (1).

2. The BOG recondenser for liquefied natural gas according to claim 1, characterized in that, A base plate (10) is fixedly connected to the bottom of a pair of support blocks (2), and the bottom of the base plate (10) is provided with anti-slip texture.

3. A liquefied natural gas BOG recondenser according to claim 1, characterized in that, An air pump (11) is fixedly connected to the side wall of one of the support blocks (2). An air pump (11) is fixedly connected to an air suction pipe (12) and an air outlet pipe (13). The other end of the air suction pipe (12) is fixedly connected to the lower end of the heat exchange tube (5), and the other end of the air outlet pipe (13) is fixedly connected to the upper end of the heat exchange tube (5).

4. A liquefied natural gas BOG recondenser according to claim 3, characterized in that, Valves are installed at both ends of the heat exchange tube (5), valves are installed on the natural gas conduit (7), and valves are installed on the intake pipe (12) and the outlet pipe (13).

5. A liquefied natural gas BOG recondenser according to claim 1, characterized in that, A drain plate (14) is fixedly connected to the water supply pipe (6), and a number of dispersion holes (15) are opened at the bottom of the drain plate (14).

6. A liquefied natural gas BOG recondenser according to claim 1, characterized in that, The heat exchange tube (5) is arranged in a spiral.

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