Recuperator for recovering cold energy of low-temperature BOG (Boil Off Gas)

Abstract

The utility model relates to the technical field of recuperator, and discloses a recuperator for recovering cold energy of low-temperature BOG (boil-off gas), which comprises a recuperator body and gas inlet pipes fixedly mounted on the left side and the right side of an inner cavity of the recuperator body, and a gas outlet pipe is fixedly mounted in the middle of the inner cavity of the recuperator body. A heat exchange air pipe is fixedly installed on the upper end face of the recuperator body, heat exchange fins are arranged in an inner cavity of the recuperator body, driving mechanisms are arranged on the left side and the right side of an inner cavity of an air inlet pipe, pressure storage boxes are fixedly installed on the left side and the right side of the upper portion of the outer side wall of the air inlet pipe, and dripping and spraying mechanisms are arranged in inner cavities of the pressure storage boxes. And a crushing mechanism is arranged in an inner cavity of the air outlet pipe. Through the arrangement of the driving mechanism and the dripping and spraying mechanism, a descaling agent can be indirectly added into the gas inlet pipe, and the quantity of scale formed on the heat exchange fins after the water is cooled is reduced, so that the whole equipment has good heat exchange efficiency, and the low-temperature BOG gas is heated.

Description

Technical Field

[0001] The utility model relates to the technical field of reheaters, in particular to a reheater for recovering the cold energy of low-temperature BOG gas. Background Technique

[0002] The Ningxia Yida LNG storage tank continuously generates low-temperature BOG gas, which successively enters the BOG air-cooled vaporizer, the BOG heat exchanger, enters the BOG inlet balance tank at room temperature, and then enters the BOG compressor. After compression, one way returns to the cold box for re-liquefaction, and the other way is regulated and supplied as fuel gas for the in-plant medium-pressure boiler, the torch pilot light, the off-plant cafeteria, and the domestic boiler.

[0003] When the ambient temperature is low in winter, the frosting and icing conditions of the two BOG air-cooled vaporizers are serious after heat exchange, and the heat exchange effect continuously decreases. The temperature of the BOG inlet balance tank can be reduced to 3-5°C, and the frosting at the BOG vaporizer and pipeline is serious, which is not conducive to the safe operation of the equipment. Content of the Utility Model

[0004] (I) Technical Problems to be Solved

[0005] The purpose of the utility model is to provide a reheater for recovering the cold energy of low-temperature BOG gas to solve the problems put forward in the above background technique.

[0006] (II) Technical Solutions

[0007] To achieve the above purpose, the utility model provides the following technical solutions:

[0008] A reheater for recovering the cold energy of low-temperature BOG gas includes a reheater body, and inlet pipes fixedly installed on the left and right sides of the inner cavity of the reheater body. An outlet pipe is fixedly installed in the middle of the inner cavity of the reheater body. A heat exchange gas pipe is fixedly installed on the upper end surface of the reheater body. Heat exchange fins are arranged in the inner cavity of the reheater body. Driving mechanisms are arranged on the left and right sides of the inner cavity of the inlet pipe. Pressure storage boxes are fixedly installed on the upper left and right sides of the outer side wall of the inlet pipe. A descaling agent is filled in the inner cavity of the pressure storage box. A drip spraying mechanism is arranged in the inner cavity of the pressure storage box. A crushing mechanism is arranged in the inner cavity of the outlet pipe.

[0009] Preferably, the driving mechanism includes a positioning plate fixedly installed in the inner cavity of the inlet pipe, and a rotating column rotatably installed in the inner cavity of the positioning plate. A triangular plate is fixedly installed on the front end surface of the rotating column. A guide vane impeller is fixedly installed on the rear end surface of the rotating column. A centrifugal cavity is arranged on the triangular plate. An extrusion plate is slidably installed in the centrifugal cavity. A centrifugal spring is fixedly installed between the extrusion plate and the inner wall of the centrifugal cavity.

[0010] Preferably, the drip spraying mechanism includes a liquid storage box fixedly installed on the upper part of the outer side wall of each intake pipe and a piston plate slidably installed in the inner cavity of the pressure accumulation box. A return spring is fixedly installed on the upper end surface of the piston plate, and a drip column is fixedly installed on the lower end surface of the piston plate.

[0011] Preferably, the other end of the return spring is fixedly installed on the top surface of the inner cavity of the liquid storage box. The drip column is connected through the intake pipe. The drip column is hollow, and the lower end of the drip column is arc-shaped. The liquid storage box is filled with a descaling agent.

[0012] Preferably, liquid outlet holes are arranged on the lower part of the outer side wall of the drip column, and a liquid inlet hole is arranged on the upper part of the outer side wall of the drip column. A one-way water valve with an outlet towards the inner cavity of the drip column is arranged in the inner cavity of the liquid inlet hole. The liquid storage box is communicated with the pressure accumulation box through a liquid inlet pipe, and a one-way water valve with an outlet towards the inner cavity of the pressure accumulation box is arranged in the liquid inlet pipe. A hole is formed in the liquid storage box.

[0013] Preferably, the crushing mechanism includes a filter plate fixedly installed in the inner cavity of the outlet pipe and a spiral column fixedly installed on the upper end surface of the piston plate. A first sprocket is threadedly installed on the outer side wall of the spiral column. A transmission rod is rotatably installed on the side wall of the outlet pipe, and a second sprocket is fixedly installed on the upper end surface of the transmission rod.

[0014] Preferably, the spiral column is connected through the pressure accumulation box. The lead angle of the spiral column is greater than the equivalent friction angle of the first sprocket. The first sprocket is rotationally connected to the pressure accumulation box through a bushing. A chain is installed for transmission between the first sprocket and the second sprocket. A crushing roller is fixedly installed on the lower end surface of the second sprocket, and the crushing roller is in contact with the side wall of the filter plate.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] 1. In this utility model, a worker injects low-temperature BOG gas into the intake pipe. At this time, the heat in the low-temperature BOG gas can be exchanged by the heat exchange fins, and then the heat exchange fins can conduct the heat to the heat exchange gas pipe. Synchronously, dry SNG gas is injected from the heat exchange gas pipe. At this time, the entire device can realize the function of heating the low-temperature BOG gas, so as to eradicate the problem of frosting and ice hanging on the BOG inlet vaporizer, and greatly save the liquefaction energy consumption.

[0017] 2. In this utility model, through the arrangement of the driving mechanism and the drip spraying mechanism, when the low-temperature BOG gas passes through the intake pipe, the scale remover in the pressure accumulator box can be indirectly added into the intake pipe. At this time, the scale remover, along with the low-temperature BOG gas, can remove and shed the scale adhering to the heat exchange plate. The massive scale will flow into the low-temperature BOG gas outlet pipe along with the low-temperature BOG gas. At this time, with the cooperation of the crushing mechanism, the scale can be further crushed to prevent it from directly flowing into the circulation air pump and causing damage to the air pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Fig. 6 is a front view of the overall structure of a recuperator for recovering the cold energy of low-temperature BOG gas according to this utility model;

[0019] Figure 2 Fig. 10 is a top view of the sectional structure of a recuperator for recovering the cold energy of low-temperature BOG gas according to this utility model;

[0020] Figure 3 Fig. 14 is a sectional view of the intake pipe of a recuperator for recovering the cold energy of low-temperature BOG gas according to this utility model;

[0021] Figure 4 Fig. 18 is a sectional view of the intake pipe of a recuperator for recovering the cold energy of low-temperature BOG gas according to this utility model;

[0022] Figure 5 Fig. 22 is a sectional view of the extrusion plate of a recuperator for recovering the cold energy of low-temperature BOG gas according to this utility model.

[0023] In the figure: 1. Recuperator body; 11. Heat exchange gas pipe; 12. Heat exchange fins; 2. Intake pipe; 3. Outlet pipe; 4. Driving mechanism; 41. Positioning plate; 42. Rotating column; 43. Triangular plate; 431. Centrifugal cavity; 432. Centrifugal spring; 433. Extrusion plate; 44. Flow guiding impeller; 5. Pressure accumulator box; 6. Drip spraying mechanism; 61. Liquid storage box; 62. Piston plate; 63. Return spring; 64. Drip column; 641. Liquid outlet hole; 642. Liquid inlet hole; 65. Liquid inlet pipe; 7. Crushing mechanism; 71. Filter plate; 72. Spiral column; 73. First sprocket; 74. Transmission rod; 75. Second sprocket; 76. Chain; 77. Crushing roller. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Next, the technical solutions in the embodiments of this utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, rather than all of the embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of this utility model.

[0025] Please refer to Figures 1 - 5 , the utility model provides a recuperator technical solution for recovering the cold energy of low-temperature BOG gas:

[0026] A recuperator for recovering the cold energy of low-temperature BOG gas includes a recuperator body 1, and intake pipes 2 fixedly installed on the left and right sides of the inner cavity of the recuperator body 1. A discharge pipe 3 is fixedly installed in the middle of the inner cavity of the recuperator body 1. A heat exchange gas pipe 11 is fixedly installed on the upper end face of the recuperator body 1. Heat exchange fins 12 are arranged in the inner cavity of the recuperator body 1. Driving mechanisms 4 are arranged on the left and right sides of the inner cavity of the intake pipe 2. Pressure storage boxes 5 are fixedly installed on the upper left and right sides of the outer side wall of the intake pipe 2. The inner cavity of the pressure storage box 5 is filled with a descaling agent. A dripping and spraying mechanism 6 is arranged in the inner cavity of the pressure storage box 5. A crushing mechanism 7 is arranged in the inner cavity of the discharge pipe 3.

[0027] Further, the driving mechanism 4 includes a positioning plate 41 fixedly installed in the inner cavity of the intake pipe 2, and a rotating column 42 rotatably installed in the inner cavity of the positioning plate 41. A triangular plate 43 is fixedly installed on the front end face of the rotating column 42. A guide vane impeller 44 is fixedly installed on the rear end face of the rotating column 42. A centrifugal cavity 431 is arranged on the triangular plate 43. An extrusion plate 433 is slidably installed in the centrifugal cavity 431. A centrifugal spring 432 is fixedly installed between the extrusion plate 433 and the inner wall of the centrifugal cavity 431.

[0028] Further, the dripping and spraying mechanism 6 includes a liquid storage box 61 fixedly installed on the upper part of the outer side wall of each intake pipe 2 and a piston plate 62 slidably installed in the inner cavity of the pressure storage box 5. A return spring 63 is fixedly installed on the upper end face of the piston plate 62. A liquid dripping column 64 is fixedly installed on the lower end face of the piston plate 62;

[0029] The other end of the return spring 63 is fixedly installed on the top surface of the inner cavity of the liquid storage box 61. The liquid dripping column 64 is connected through the intake pipe 2. The liquid dripping column 64 is hollow, and the lower end of the liquid dripping column 64 is arc-shaped. The liquid storage box 61 is filled with a descaling agent;

[0030] Liquid outlet holes 641 are arranged on the lower part of the outer side wall of the liquid dripping column 64. Liquid inlet holes 642 are arranged on the upper part of the outer side wall of the liquid dripping column 64. And a one-way water valve with an outlet facing the inner cavity of the liquid dripping column 64 is arranged in the inner cavity of the liquid inlet hole 642. The liquid storage box 61 is communicated with the pressure storage box 5 through a liquid inlet pipe 65. And a one-way water valve with an outlet facing the inner cavity of the pressure storage box 5 is arranged in the liquid inlet pipe 65. A hole is opened on the liquid storage box 61.

[0031] Further, the crushing mechanism 7 includes a filter plate 71 fixedly installed in the inner cavity of the discharge pipe 3, and a spiral column 72 fixedly installed on the upper end face of the piston plate 62. A first sprocket 73 is threadedly installed on the outer side wall of the spiral column 72. A transmission rod 74 is rotatably installed on the side wall of the discharge pipe 3. A second sprocket 75 is fixedly installed on the upper end face of the transmission rod 74;

[0032] The spiral column 72 is connected through the accumulator box 5. The lead angle of the thread of the spiral column 72 is greater than the equivalent friction angle of the first sprocket 73. The first sprocket 73 is rotatably connected to the accumulator box 5 through a bushing. A chain 76 is installed for transmission between the first sprocket 73 and the second sprocket 75. A crushing roller 77 is fixedly installed on the lower end surface of the second sprocket 75. The crushing roller 77 is in contact with the side wall of the filter plate 71.

[0033] Working principle:

[0034] During operation, the worker injects the low-temperature BOG gas into the inlet pipe 2. At this time, the heat in the low-temperature BOG gas can be exchanged by the heat exchange fins 12. Then, the heat exchange fins 12 can conduct the heat to the heat exchange gas pipe 11. Synchronously, dry SNG gas is input into the heat exchange gas pipe 11. At this time, the whole device can realize the function of heating the low-temperature BOG gas, so as to eliminate the problem of frosting and icing on the BOG inlet vaporizer, greatly saving the liquefaction energy consumption;

[0035] When the low-temperature BOG gas is injected into the reheater body 1 through the inlet pipe 2, the flowing low-temperature BOG gas can drive the guide impeller 44 to rotate. The guide impeller 44 will drive the rotating column 42 to make the triangular plate 43 rotate. When the pressing plate 433 on the triangular plate 43 contacts the arc end of the drip column 64, the triangular plate 43 can lift the drip column 64 to move it upward. At this time, the piston plate 62 will also move upward to the upper part of the inner cavity of the accumulator box 5. As the volume of the lower inner cavity of the accumulator box 5 continuously increases, the pressure of the descaling agent inside continuously decreases. At this time, the descaling liquid in the inner cavity of the liquid storage box 61 can enter the lower inner cavity of the accumulator box 5 through the liquid inlet pipe 65 to realize the supplement of the descaling liquid content. When the end of the triangular plate 43 is separated from the arc end of the drip column 64, the pressing piston plate 62 will move downward to the lower part of the inner cavity of the accumulator box 5. At this time, the volume of the lower inner cavity of the accumulator box 5 continuously decreases, and the pressure of the descaling agent inside continuously increases. Finally, the descaling agent can break through the one-way water valve of the liquid inlet hole 642 and be discharged from the liquid outlet hole 641, dropping into the inner cavity of the inlet pipe 2. At this time, along with the continuously flowing low-temperature BOG gas, it can be scattered in every corner of the heat exchange fins 12, eroding the water scale condensed on the heat exchange fins and causing it to fall off, so as to ensure the good heat exchange effect of the whole reheater body 1. Finally, the lumped water scale after falling off will flow out with the low-temperature BOG gas to the outlet pipe 3;

[0036] It should be noted that since the triangular plate 43 rotates with the rotation of the diversion impeller 44 through the rotating column 42, when the working power of the reheater body 1 increases and the speed of the low-temperature BOG gas in the intake pipe 2 is relatively high, the rotation speed of the triangular plate 43 also increases accordingly. At this time, under the action of the centrifugal force of the pressing plate 433, the pressing plate 433 will move towards the outer side of the inner cavity of the centrifugal cavity 431. At this time, the rotation radius of the entire pressing plate 433 also increases, so that the upward amplitude of the piston plate 62 can be increased, and the return spring 63 is compressed less. At this time, the elastic force of the return spring 63 increases significantly. Furthermore, the pressure of the descaling agent in the lower inner cavity of the accumulator box 5 pressed by the downward movement of the piston plate 62 will also increase, that is, more descaling agent can be sprayed into the intake pipe 2 to fully enhance the function of the descaling agent to remove the water scale on the reheater body 1. Thus, through the above description, the device of the present invention can adjust the amount of the low-temperature BOG gas passing through the intake pipe 2 according to the change of the working power of the reheater body 1 to adaptively adjust the addition amount of the descaling agent, reasonably saving the cost of descaling, and at the same time ensuring that the reheater body 1 can still be descaled with high quality;

[0037] When the piston plate 62 rises or falls, since the lead angle of the screw column 72 is greater than the equivalent friction angle of the first sprocket 73, and the first sprocket 73 is rotatably connected to the accumulator box 5 through a bushing, the first sprocket 73 will rotate forward and reverse continuously at this time. At this time, under the drive of the chain 76, the second sprocket 75 will also drive the transmission rod 74 to make the crushing roller 77 rotate. Since the crushing roller 77 is in contact with the filter plate 71, the rotation of the crushing roller 77 can drive the low-temperature BOG gas at the filter plate 71 to agitate, so that the agglomerated water scale will also break in the agitated low-temperature BOG gas, and the harder water scale will converge in the middle of the filter plate 71. Cooperating with the continuously rotating crushing roller 77, the water scale can be crushed. At this time, the crushed water scale can be discharged through the holes on the filter plate 71, avoiding damage to the impeller of the air pump caused by the water scale and ensuring its normal service life.

[0038] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than limiting the protection scope of the present invention. Any simple modification or equivalent replacement made by those of ordinary skill in the art to the technical solution of the present invention shall not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A reheater for recovering cold energy of low-temperature BOG gas, comprising a reheater body (1), and air inlet pipes (2) fixedly mounted on the left and right sides of the inner cavity of the reheater body (1), an air outlet pipe (3) fixedly mounted in the middle of the inner cavity of the reheater body (1), a heat exchange air pipe (11) fixedly mounted on the upper end surface of the reheater body (1), and a heat exchange fin (12) provided in the inner cavity of the reheater body (1), characterized in that: A driving mechanism (4) is provided on the left and right sides of the inner cavity of the air inlet pipe (2), a pressure storage box (5) is fixedly installed on the left and right sides of the upper part of the outer wall of the air inlet pipe (2), the inner cavity of the pressure storage box (5) is filled with a descaling agent, the inner cavity of the pressure storage box (5) is provided with a dripping spray mechanism (6), and the inner cavity of the air outlet pipe (3) is provided with a pulverizing mechanism (7).

2. A recuperator for recovering cold energy of low-temperature BOG gas according to claim 1, characterized in that: The driving mechanism (4) comprises a positioning plate (41) fixedly mounted in the inner cavity of the air intake pipe (2), and a rotating column (42) rotatably mounted in the inner cavity of the positioning plate (41); a triangular plate (43) is fixedly mounted on the front end surface of the rotating column (42); a guide impeller (44) is fixedly mounted on the rear end surface of the rotating column (42); a centrifugal cavity (431) is provided on the triangular plate (43); an extrusion plate (433) is slidably mounted in the centrifugal cavity (431); and a centrifugal spring (432) is fixedly mounted between the extrusion plate (433) and the inner wall of the centrifugal cavity (431).

3. A recuperator for recovering cold energy of low-temperature BOG gas according to claim 2, characterized in that: The drip spray mechanism (6) comprises a liquid storage box (61) fixedly mounted on the upper portion of the outer wall of each air inlet pipe (2) and a piston plate (62) slidably mounted in the inner cavity of the pressure storage box (5); a return spring (63) is fixedly mounted on the upper end surface of the piston plate (62), and a drip column (64) is fixedly mounted on the lower end surface of the piston plate (62).

4. A recuperator for recovering cold energy of low-temperature BOG gas according to claim 3, characterized in that: The other end of the return spring (63) is fixedly mounted on the top surface of the inner cavity of the liquid storage box (61); the dripping column (64) is connected to the air inlet pipe (2); the dripping column (64) is hollow, and the lower end of the dripping column (64) is arc-shaped; the liquid storage box (61) is filled with a descaling agent.

5. The recuperator for recovering cold energy of low-temperature BOG gas according to claim 3, characterized in that: The lower portion of the outer wall of the liquid dripping column (64) is provided with a liquid outlet hole (641), the upper portion of the outer wall of the liquid dripping column (64) is provided with a liquid inlet hole (642), and the inner cavity of the liquid inlet hole (642) is provided with a one-way water valve with an outlet toward the inner cavity of the liquid dripping column (64); the liquid storage box (61) is connected to the pressure accumulation box (5) through a liquid inlet pipe (65), and the liquid inlet pipe (65) is provided with a one-way water valve with an outlet toward the inner cavity of the pressure accumulation box (5); and a hole is opened on the liquid storage box (61).

6. The recuperator for recovering cold energy of low-temperature BOG gas according to claim 3, characterized in that: The pulverizing mechanism (7) comprises a filter plate (71) fixedly mounted in the inner cavity of the air outlet pipe (3), and a spiral column (72) fixedly mounted on the upper end surface of the piston plate (62), a first sprocket (73) being threadedly mounted on the outer wall of the spiral column (72), a transmission rod (74) being rotatably mounted on the side wall of the air outlet pipe (3), and a second sprocket (75) being fixedly mounted on the upper end surface of the transmission rod (74).

7. A recuperator for recovering cold energy of low-temperature BOG gas according to claim 6, characterized in that: The spiral column (72) is connected to the pressure accumulator box (5) through the spiral column (72); the thread lead angle of the spiral column (72) is greater than the equivalent friction angle of the first sprocket (73); the first sprocket (73) is rotatably connected to the pressure accumulator box (5) via a shaft sleeve; a chain (76) is installed between the first sprocket (73) and the second sprocket (75); a crushing roller (77) is fixedly installed on the lower end surface of the second sprocket (75); the crushing roller (77) is in contact with the side wall of the filter plate (71).

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