CN218879829U - BOG recondensation processing apparatus - Google Patents
BOG recondensation processing apparatus Download PDFInfo
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- CN218879829U CN218879829U CN202223014183.1U CN202223014183U CN218879829U CN 218879829 U CN218879829 U CN 218879829U CN 202223014183 U CN202223014183 U CN 202223014183U CN 218879829 U CN218879829 U CN 218879829U
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- 230000007246 mechanism Effects 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims description 9
- 230000000712 assembly Effects 0.000 claims description 8
- 238000000429 assembly Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims 1
- 230000003139 buffering effect Effects 0.000 abstract description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 4
- 239000003345 natural gas Substances 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 11
- 239000007789 gas Substances 0.000 description 8
- 230000008901 benefit Effects 0.000 description 5
- 239000007791 liquid phase Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 230000009191 jumping Effects 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000007792 gaseous phase Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
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Abstract
The utility model relates to a natural gas receiving station technical field especially relates to a BOG recondensation processing apparatus. The device comprises a cold box, an LNG buffer tank, a recondenser, a supercharging mechanism and a low-pressure LNG conveying main pipe; the cold box comprises a first channel and a second channel, wherein the inlet of the first channel is communicated with the low-pressure LNG conveying main pipe, the inlet of the second channel is used for receiving BOG, and the outlets of the first channel and the second channel are both communicated with the inlet of the LNG buffer tank; the recondenser comprises a first inlet and a second inlet, the first inlet is communicated with an outlet at the top of the LNG buffer tank, and the second inlet is communicated with the low-pressure LNG conveying main; the outlet at the bottom of the LNG buffer tank and the outlet of the recondenser are both communicated with the inlet of the pressurization mechanism. The device can improve BOG processing and buffering capacity, relieves the condition that the recondensor jumps when operating, thereby timely recovering BOG and ensuring reliable operation of the device.
Description
Technical Field
The utility model belongs to the technical field of the natural gas receiving station technique and specifically relates to a BOG recondensation processing apparatus is related to.
Background
Boil-off gas (BOG) generated in the receiving station is mainly generated by heat input, pressure change, and changes in the volume of the gas phase in the tank caused by tank truck loading and unloading and LNG loading and unloading of the storage tank of the ship due to pump operation in the tank, external heat, and the like. From the viewpoint of safety, environmental protection and economic efficiency, the blow-down of the BOG gas should be avoided as much as possible, and therefore, the BOG must be recycled.
Currently, the BOG processing scheme is mainly two: a direct export process and a recondensing process. The direct output process is to directly compress BOG to higher output pipe network pressure by using a BOG compressor and then directly output the BOG. The recondensing process is to pressurize the BOG to a lower pressure by a low-temperature compressor, and then mix the BOG with LNG discharged from an LNG storage tank in a recondenser to absorb and exchange heat. Because the LNG is in a supercooled state after being pressurized, the evaporated gas can be re-condensed and then pressurized by a high-pressure pump to be gasified by a gasifier for output. The recondensing process is less energy intensive than the direct output process and is widely used in the receiving station.
As the construction scale of the receiving station is gradually enlarged, the amount of BOG generation of the receiving station is greatly increased, and therefore, the recondenser is insufficient to condense all BOG, resulting in waste of BOG; moreover, the recondensor needs to be periodically overhauled, and only BOG can be discharged to a torch during overhauling, so that the problems of resource waste and environmental pollution are further caused. In addition, the recondenser is sensitive to BOG flow fluctuation, and the problems of liquid level and pressure fluctuation, vehicle jumping and the like are easily caused under the condition that a plurality of high-pressure pumps run simultaneously, so that the external output stability is greatly influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a BOG recondensation processing apparatus to the BOG who solves prior art existence can't in time recovery processing and lead to the technical problem of extravagant resource and harm environment.
In order to realize the purpose, the utility model adopts the following technical scheme:
a BOG recondensation processing device comprises a cold box, an LNG buffer tank, a recondensor, a supercharging mechanism and a low-pressure LNG delivery main pipe;
the cold box comprises a first channel and a second channel, the inlet of the first channel is communicated with the low-pressure LNG conveying main pipe, the inlet of the second channel is used for receiving BOG, and the outlets of the first channel and the second channel are both communicated with the inlet of the LNG buffer tank;
the recondenser comprises a first inlet and a second inlet, the first inlet is communicated with the outlet at the top of the LNG buffer tank, and the second inlet is communicated with the low-pressure LNG conveying main;
and an outlet at the bottom of the LNG buffer tank and an outlet of the recondenser are both communicated with an inlet of the pressurization mechanism.
Further, the boost mechanism includes one or more high pressure pump assemblies;
any one of the high-pressure pump assemblies comprises a high-pressure pump and a high-pressure pump inlet pipeline set, wherein an inlet of the high-pressure pump is communicated with an outlet at the bottom of the LNG buffer tank and an outlet of the recondenser through a high-pressure pump inlet pipeline.
Further, the high-pressure pump inlet pipe set includes a first high-pressure pump inlet pipe and a second high-pressure pump inlet pipe; the first high-pressure pump inlet pipe is communicated with an outlet at the bottom of the LNG buffer tank, and the second high-pressure pump inlet pipe is communicated with an outlet of the recondenser.
Further, the recondenser is provided with two.
Further, the cold box further comprises a third channel, and an outlet of the supercharging mechanism is communicated with an inlet of the third channel.
Further, the inlet of the LNG buffer tank is communicated with the low-pressure LNG conveying main pipe.
Further, the device also comprises a gasifier, and an outlet of the pressurization mechanism is communicated with an inlet of the gasifier.
The utility model has the advantages that:
the utility model provides a BOG recondensation processing device, which comprises a cold box, an LNG buffer tank, a recondensor, a supercharging mechanism and a low-pressure LNG conveying main pipe; the cold box comprises a first channel and a second channel, wherein the inlet of the first channel is communicated with the low-pressure LNG conveying main pipe, the inlet of the second channel is used for receiving BOG, and the outlets of the first channel and the second channel are both communicated with the inlet of the LNG buffer tank; the recondenser comprises a first inlet and a second inlet, the first inlet is communicated with an outlet at the top of the LNG buffer tank, and the second inlet is communicated with the low-pressure LNG conveying main; the outlet at the bottom of the LNG buffer tank and the outlet of the recondenser are both communicated with the inlet of the pressurization mechanism.
The device cools the normal-temperature BOG through the cold box, reduces the cold quantity of the low-pressure LNG entering the recondenser, and can reduce the equipment investment of the recondenser compared with the traditional recondenser; the cooling box, the LNG buffer tank and the recondenser are cooperatively matched with each other, BOG can be recovered in time, BOG processing and buffering capacity is improved, and the condition of vehicle jumping of the recondenser during operation is relieved; in addition, the LNG buffer tank and the recondenser can operate simultaneously and can also operate independently. The device can timely recover the BOG and ensure that the device can reliably operate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a BOG recondensing apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a BOG recondensing apparatus according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a BOG recondensing apparatus according to a third embodiment of the present invention.
An icon:
1-a cold box; 2-LNG buffer tank; 3-recondensor; 4-a supercharging mechanism; 41-a high pressure pump; 42-a first high pressure pump inlet pipe; 43-a second high pressure pump inlet pipe; 5-low pressure LNG transfer mains; 6-low pressure LNG spray pipes; 7-a liquid outlet pipeline; 8-a third channel inlet tube; 9-third channel outlet duct.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
It should be noted that, in the description of the present invention, the terms "connected" and "mounted" should be interpreted broadly, for example, they may be fixedly connected, detachably connected, or integrally connected; can be directly connected or connected through an intermediate medium; either mechanically or electrically. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
Example one
The present embodiment provides a BOG recondensing apparatus, which, referring to fig. 1, includes a cold box 1, an LNG buffer tank 2, a recondenser 3, a booster mechanism 4, and a low-pressure LNG transfer header 5;
the cold box 1 comprises a first channel and a second channel, wherein the inlet of the first channel is communicated with the low-pressure LNG conveying main pipe 5, the inlet of the second channel is used for receiving BOG, and the outlets of the first channel and the second channel are both communicated with the inlet of the LNG buffer tank 2;
the recondenser 3 comprises a first inlet connected to an outlet at the top of the LNG buffer tank 2 and a second inlet connected to the low-pressure LNG transfer header 5;
the outlet at the bottom of the LNG buffer tank 2 and the outlet of the recondenser 3 are both communicated with the inlet of a pressurization mechanism 4.
The working principle of the device is as follows:
firstly, low-pressure LNG discharged from a low-pressure pump outlet enters a first channel of a cold box 1 through a branch pipe on a low-pressure LNG conveying main pipe 5, BOG discharged from a compressor outlet enters a second channel of the cold box 1, and the BOG and the low-pressure LNG exchange heat in the cold box 1; then, the BOG and the low-pressure LNG after heat exchange enter an LNG buffer tank 2, and a gas phase at the top of the LNG buffer tank 2 and a liquid phase at the bottom of the LNG buffer tank 2 are obtained through separation; then, the gas phase discharged from the LNG buffer tank 2 enters the recondenser 3, and meanwhile, the low-pressure LNG enters the recondenser 3 through a branch pipe on the low-pressure LNG transfer main pipe 5, and the gas phase and the liquid phase are absorbed in parallel; finally, the absorbed low-pressure LNG discharged from the recondenser 3 and the liquid phase discharged from the LNG buffer tank 2 are sent to a pressurizing mechanism 4 to be pressurized and discharged. In the process, the cold box 1 is used for cooling the normal-temperature BOG, so that the cold quantity of the low-pressure LNG entering the recondenser 3 is reduced, and the equipment investment of the recondenser can be reduced compared with that of a traditional recondenser; the cooling box 1, the LNG buffer tank 2 and the recondenser 3 are cooperatively matched with one another, BOG can be recovered in time, BOG processing and buffering capacity is improved, and the condition that the recondenser 3 jumps during operation is relieved; in addition, the LNG buffer tank 2 and the recondenser 3 can run simultaneously and can also run independently, and when the recondenser 3 is overhauled, the LNG buffer tank 2 can run independently, so that the device can run reliably.
In this embodiment, the low-pressure LNG enters the recondenser 3 through the low-pressure LNG sparger 6 on the low-pressure LNG transfer header 5.
In this embodiment, the outlet of the recondenser 3 is connected to the low pressure LNG transfer header 5 via a liquid outlet line 7. Through the arrangement, the absorbed low-pressure LNG discharged from the lower part of the recondenser 3 enters the low-pressure LNG conveying main pipe 5 through the liquid outlet pipeline 7, and is discharged downwards after being gathered with the low-pressure LNG in the low-pressure LNG conveying main pipe 5, so that the pipeline structure is simplified, the overhaul convenience is improved, and the cost is reduced.
Further, the booster mechanism 4 includes a high-pressure pump assembly; the high-pressure pump assembly comprises a high-pressure pump 41 and a high-pressure pump inlet pipeline set, wherein an inlet of the high-pressure pump 41 is communicated with an outlet at the bottom of the LNG buffer tank 2 and an outlet of the recondenser 3 through the high-pressure pump inlet pipeline.
Specifically, the high-pressure pump inlet piping group includes a first high-pressure pump inlet pipe 42 and a second high-pressure pump inlet pipe 43; an inlet of the first high-pressure pump inlet pipe 42 is communicated with an outlet at the bottom of the LNG buffer tank 2, and an inlet of the second high-pressure pump inlet pipe 43 is communicated with an outlet of the recondenser 3; the outlets of the first and second high-pressure pump inlet pipes 42, 43 are both communicated with the high-pressure pump 41. More specifically, the inlet of the second high-pressure pump inlet pipe 43 is communicated with the low-pressure LNG transfer main 5, and the connection position of the second high-pressure pump inlet pipe 43 and the low-pressure LNG transfer main 5 is located downstream of the connection position of the liquid outlet line 7 and the low-pressure LNG transfer main 5.
The first high-pressure pump inlet pipe 42 and the second high-pressure pump inlet pipe 43 are provided with valves, respectively. Aiming at the working condition that the LNG buffer tank 2 and the recondenser 3 operate simultaneously or independently, the first high-pressure pump inlet pipe 42 and the second high-pressure pump inlet pipe 43 can be respectively opened or independently opened through the control valve.
Further, the device of the present application further includes a gasifier, and an outlet of the pressurization mechanism 4 (i.e., the high-pressure pump 41) is communicated with an inlet of the gasifier. The low-pressure LNG introduced into the high-pressure pump 41 is pressurized, introduced into the vaporizer, vaporized, and then delivered.
Example two
This example provides a BOG recondensing apparatus substantially the same as that described in example one, except that:
referring to fig. 2, in the present embodiment, two recondensors 3 are provided. The two recondensors 3 are arranged in parallel, first inlets of the two recondensors 3 are both communicated with an outlet at the top of the LNG buffer tank 2, and second inlets of the two recondensors 3 are respectively communicated with a low-pressure LNG delivery header pipe 5 through a low-pressure LNG spray pipe 6; the outlets of both recondensors 3 communicate with the inlet of the booster mechanism 4.
In this embodiment, the outlets of the recondensors 3 are each connected to the low-pressure LNG transfer header 5 by a respective outlet line 7.
This embodiment ensures reliable operation of the apparatus by providing two recondensors 3 so that when one recondensor 3 is serviced, the other recondensor 3 can be turned on.
EXAMPLE III
This embodiment provides a BOG recondensing apparatus substantially the same as that described in the first embodiment, except that:
referring to fig. 3, in the present embodiment, the cold box 1 further includes a third passage, and the outlet of the pressurization mechanism 4 communicates with the inlet of the third passage.
Specifically, the high-pressure LNG discharged from the high-pressure pump 41 enters the third channel through the third channel inlet pipe 8, and the BOG in the second channel exchanges heat with the low-pressure LNG in the first channel and the high-pressure LNG in the third channel in sequence, so that the recovery rate of the BOG is further increased, and the utilization rate of the high-pressure LNG is increased. The heat-exchanged high-pressure LNG discharged from the third channel can be conveyed to the gasifier through the outlet pipe 9 of the third channel, and is gasified by the gasifier and then conveyed outside.
Further, the boost mechanism 4 includes one or more high pressure pump assemblies; in the present embodiment, the pressurizing mechanism 4 includes a plurality of high-pressure pump assemblies. The plurality of high-pressure pump assemblies can be opened one or more of the high-pressure pump assemblies, and can also be opened at the same time, and the specific opening number is adjusted according to different working conditions of the device. The arrangement can greatly reduce the possibility of vehicle jumping of the recondenser 3 under the condition of large external input fluctuation, meets the treatment requirements of BOG cleaning and high efficiency, and has higher environmental protection benefit and economic benefit.
Further, the inlet of the LNG buffer tank 2 is connected to the low-pressure LNG transfer header 5. Specifically, the LNG buffer tank 2 includes three inlets, and the three inlets are respectively communicated with the outlet of the first passage, the outlet of the second passage, and the low-pressure LNG transfer header 5.
One of them entry of LNG buffer tank 2 is passed through the by-pass pipe and is linked together in low pressure LNG transfer main 5 to, low pressure LNG in the low pressure LNG transfer main 5 can get into in LNG buffer tank 2, makes gaseous phase and liquid phase among the LNG buffer tank 2 can the rapid separation, and improves the gaseous phase and fuses the ratio in liquid phase.
In this embodiment, the opening of the pressure regulating valve is directly controlled by the pressure controller in the pressure control of the recondenser 3 to regulate the flow of the low-pressure LNG entering the recondenser 3, thereby achieving the purpose of stabilizing the operating pressure of the recondenser 3; the liquid level control directly controls the opening degree of a range liquid level regulating valve on the low-pressure LNG conveying main pipe 5 through a liquid level controller, and the stability of the liquid level of the recondenser 3 is guaranteed.
Alternatively, the present embodiment prefers pressure control to ensure the suction pressure at the inlet of the high-pressure pump 41.
The recondenser 3 is specifically controlled in two ways: 1) Calculating the required low-pressure LNG flow according to the BOG gas flow in proportion, then calculating and comparing the required low-pressure LNG flow with the high selection result of the pressure and the liquid level of the recondenser 3, and then performing cascade control on the low-pressure LNG flow and a flow signal on a low-pressure LNG conveying main pipe 5; 2) And (4) performing high selection on the pressure and the liquid level signals of the recondenser 3, and adjusting the flow according to a high selection result.
The specific parameters of the above components of the present embodiment are as follows:
in the cold box 1, the temperature difference range of the low-pressure LNG inlet and the low-pressure LNG outlet is 5-10 ℃, and the ratio of the low-pressure LNG to the BOG is 2-5; the temperature difference between the inlet and the outlet of the high-pressure LNG is 10-15 ℃, and the ratio of the high-pressure LNG to the BOG is 1-3;
the pressure of BOG is between 0.6 and 0.9 Mpa;
the operating pressure of the low-pressure LNG is between 0.8 and 1.1 MPaG;
the LNG buffer tank 2 is level controlled in line with the recondenser 3.
Adopt this application the device have the beneficial effect as follows:
1. the LNG buffer tank 2 and the recondenser 3 can run simultaneously or independently, and can be used as backup when the recondenser 3 is inspected and maintained, so that the running reliability of the device is improved;
2. the BOG processing and buffering capacity under large-scale output is improved through the cooperative matching of the cold box 1, the LNG buffer tank 2 and the recondenser 3;
3. the normal-temperature BOG is cooled through the cooling box 1, the processing capacity of the recondenser 3 is improved, the cold quantity of low-pressure LNG entering the recondenser 3 is reduced, and the equipment investment of the recondenser 3 is reduced;
4. greatly reducing the possibility of vehicle jumping of the recondenser 3 with large external input fluctuation, and having higher environmental protection benefit and economic benefit.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (7)
1. A BOG recondensation processing apparatus, comprising a cold box (1), an LNG buffer tank (2), a recondenser (3), a booster mechanism (4), and a low-pressure LNG feed header (5);
the cold box (1) comprises a first channel and a second channel, wherein the inlet of the first channel is communicated with the low-pressure LNG conveying main pipe (5), the inlet of the second channel is used for receiving BOG, and the outlets of the first channel and the second channel are communicated with the inlet of the LNG buffer tank (2);
the recondenser (3) comprises a first inlet connected to an outlet at the top of the LNG buffer tank (2) and a second inlet connected to the low-pressure LNG transfer header (5);
the outlet at the bottom of the LNG buffer tank (2) and the outlet of the recondenser (3) are both communicated with the inlet of the pressurization mechanism (4).
2. The BOG recondensing process apparatus of claim 1, wherein the pressurization mechanism (4) comprises one or more high pressure pump assemblies;
any one of the high-pressure pump assemblies comprises a high-pressure pump (41) and a high-pressure pump inlet pipeline set, wherein an inlet of the high-pressure pump (41) is communicated with an outlet at the bottom of the LNG buffer tank (2) and an outlet of the recondenser (3) through the high-pressure pump inlet pipeline.
3. The BOG recondensing apparatus of claim 2, wherein the high pressure pump inlet line set comprises a first high pressure pump inlet pipe (42) and a second high pressure pump inlet pipe (43); the first high-pressure pump inlet pipe (42) is communicated with an outlet at the bottom of the LNG buffer tank (2), and the second high-pressure pump inlet pipe (43) is communicated with an outlet of the recondenser (3).
4. The BOG recondensing treatment apparatus according to claim 1, wherein the recondenser (3) is provided in two.
5. The BOG recondensing apparatus according to claim 1, wherein the cold box (1) further comprises a third passage, and the outlet of the pressurization mechanism (4) is communicated with the inlet of the third passage.
6. BOG recondensation processing unit according to claim 1, wherein the LNG buffer tank (2) has its inlet connected to the low-pressure LNG transfer header (5).
7. The BOG recondensing apparatus of claim 1, further comprising a gasifier, wherein the outlet of the pressurization mechanism (4) is in communication with the inlet of the gasifier.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223014183.1U CN218879829U (en) | 2022-11-11 | 2022-11-11 | BOG recondensation processing apparatus |
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| CN202223014183.1U CN218879829U (en) | 2022-11-11 | 2022-11-11 | BOG recondensation processing apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115637180A (en) * | 2022-11-11 | 2023-01-24 | 中国海洋石油集团有限公司 | BOG (boil off gas) recondensation treatment device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115637180A (en) * | 2022-11-11 | 2023-01-24 | 中国海洋石油集团有限公司 | BOG (boil off gas) recondensation treatment device and method |
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