CN214580442U - Remove LNG tank evaporating gas recovery unit - Google Patents
Remove LNG tank evaporating gas recovery unit Download PDFInfo
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- CN214580442U CN214580442U CN202120641761.0U CN202120641761U CN214580442U CN 214580442 U CN214580442 U CN 214580442U CN 202120641761 U CN202120641761 U CN 202120641761U CN 214580442 U CN214580442 U CN 214580442U
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- gas
- lng tank
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- cng
- pipeline
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- 238000011084 recovery Methods 0.000 title claims abstract description 30
- 238000001704 evaporation Methods 0.000 title abstract description 11
- 238000005485 electric heating Methods 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- 238000003860 storage Methods 0.000 abstract description 11
- 230000008020 evaporation Effects 0.000 abstract description 8
- 238000003912 environmental pollution Methods 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 230000010354 integration Effects 0.000 abstract description 2
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 52
- 239000003949 liquefied natural gas Substances 0.000 description 40
- 238000001514 detection method Methods 0.000 description 12
- 239000012071 phase Substances 0.000 description 9
- 230000001276 controlling effect Effects 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 2
- 239000007792 gaseous phase Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- HOWJQLVNDUGZBI-UHFFFAOYSA-N butane;propane Chemical compound CCC.CCCC HOWJQLVNDUGZBI-UHFFFAOYSA-N 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The utility model relates to a remove LNG tank evaporation gas recovery unit, including removing running gear, its characterized in that, it is equipped with empty temperature formula heater to remove running gear, the entrance point of empty temperature formula heater passes through the gas pipeline intercommunication of air inlet pipeline with the LNG tank, be equipped with the control valve on the gas pipeline, be equipped with temperature transmitter on the exit end of empty temperature formula heater and draw forth two bleeder lines and be connected with the entrance point of electric heat reheater, the entrance point of CNG compressor respectively, be equipped with the ooff valve on two bleeder lines, the exit end of electric heat reheater passes through the first pipeline and is connected with the entrance point of CNG compressor, be equipped with temperature transmitter, ooff valve on the first pipeline in proper order, the exit end of CNG compressor passes through the ooff valve and CNG gas collecting tank intercommunication; carry out heating, compression, the airtight recovery of storage integration to the boil-off gas, effectively solve prior art and directly release the technical problem that causes environmental pollution, safe risk to the atmosphere with LNG tank boil-off gas.
Description
Technical Field
The utility model relates to a LNG boil-off gas handles technical field, indicates a remove LNG tank evaporating gas recovery unit very much.
Background
With the development of national economy and the continuous improvement of the importance of environmental protection, natural gas is more and more favored as clean energy. In recent two years, under the background of high-speed increase of domestic natural gas market demand and shortage of resource supply, the LNG (liquefied natural gas) tank is suitable for water and land and storage and transportation by virtue of the storage and transportation flexibility, can realize multi-mode intermodal transportation to reach the terminal users, can serve as a temporary storage facility, quickly becomes an industrial hotspot, is highly concerned by the national energy agency, the transportation department and local governments in coastal provinces, and is also put out a series of policies by the relevant ministry of China to promote the rapid development of the LNG tank. The LNG tank storage yard serving as a central node for receiving, transporting, transferring and transferring the LNG tanks is an important link for effectively promoting the application of the LNG tank storage yard. The inside low temperature LNG of LNG tank container can continuously absorb atmospheric heat around under the inside and outside difference in temperature effect of tank container during storage yard stockpiling, thereby inside gas phase space is formed with the boil-off gas and makes and step up in the jar gradually, if can not in time take measures, pressure can continuously step up to the uncontrolled outside of LNG tank container relief valve diffusion pressure of releasing flammable boil-off gas of releasing.
The conventional common method is that before the boil-off gas of the LNG tank reaches the relief pressure of the relief valve, the relief valve is manually opened to bypass the relief valve to directly release the boil-off gas to the ambient atmosphere to reduce the pressure of the LNG tank, although the method can reduce the pressure of the LNG tank and avoid overpressure relief, the method can directly release the boil-off gas to the atmosphere, on one hand, environmental pollution and economic loss are caused, on the other hand, the production operation of the LNG tank yard mainly carries out mechanical transportation of horizontal and vertical space position transfer of the tank as an integral packing material instead of internal LNG medium filling and releasing process operation, and the released flammable boil-off gas possibly forms explosive mixed gas around the LNG tank and has great safety risk.
Therefore, the prior art has a larger improvement space.
SUMMERY OF THE UTILITY MODEL
The utility model aims at remedying the deficiency of the prior art, providing a remove LNG tank evaporation gas recovery unit.
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:
the utility model discloses a remove LNG tank evaporation gas recovery unit, including removing running gear, its characterized in that, it is equipped with empty temperature formula heater to remove running gear, the entrance point of empty temperature formula heater passes through the inlet line and communicates with the gaseous phase pipeline of LNG tank, be equipped with the control valve on the gaseous phase pipeline, be equipped with temperature transmitter on the exit end of empty temperature formula heater and draw forth two bleeder lines and be connected with the entrance point of electric heat reheater, the entrance point of CNG compressor respectively, be equipped with the ooff valve on two bleeder lines, the exit end of electric heat reheater passes through the first pipeline and is connected with the entrance point of CNG compressor, be equipped with temperature transmitter, ooff valve on the first pipeline in proper order, the exit end of CNG compressor passes through the ooff valve and communicates with CNG gas collecting tank; the temperature transmitter, the switch valve, the electric heating reheater and the CNG compressor are respectively electrically connected with the control system.
According to the scheme, the air inlet pipeline is provided with the opening adjusting valve and the pressure transmitter in sequence, and the opening adjusting valve and the pressure transmitter are respectively electrically connected with the control system.
According to the scheme, the air inlet pipeline is communicated with the gas phase pipeline through a low-temperature metal hose.
According to the scheme, a pressure release valve is arranged in front of the opening adjusting valve.
According to the scheme, the outlet end of the CNG compressor is also provided with a check valve.
According to the scheme, the outlet end of the CNG gas collecting tank is provided with a control valve.
According to the scheme, the control valve is a manual valve.
The beneficial effects of the utility model reside in that:
the device for recovering the boil-off gas of the movable LNG tank is simple in structure and convenient to operate, and can perform closed recovery operation only by moving the recovery device to a specified position through the movable travelling mechanism and connecting a gas phase pipeline of the LNG tank; through heating, compressing, storing the airtight recovery of integration to the boil-off gas, effectively avoid releasing of flammable boil-off gas, reduce the safety risk, improve the economic benefits that the tank stored to can avoid environmental pollution, effectively solve prior art and directly release the technical problem that leads to the fact environmental pollution, safety risk to the atmosphere with LNG tank boil-off gas.
Drawings
Figure 1 is the utility model discloses a remove LNG tank evaporation gas recovery unit's schematic structure.
In the figure: 1. an LNG tank; 11. a gas phase line; 12. a control valve; 13. a low temperature metal hose; 131. a pressure relief valve; 2. an air intake line; 21. an opening degree regulating valve; 22. a pressure transmitter; 3. heating in an air temperature mode; 31. a temperature transmitter; 32. an on-off valve; 4. an electric heating reheater; 41. a first pipeline; 5. a CNG compressor; 51. a check valve; 6. CNG gas collection tank.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in fig. 1, the boil-off gas recovery device of the mobile LNG tank of the present invention comprises a mobile walking mechanism, it is characterized in that the moving and traveling mechanism is provided with an air temperature type heater 3, the inlet end of the air temperature type heater 3 is communicated with a gas phase pipeline 11 of the LNG tank 1 through an air inlet pipeline 2, a control valve 12 is arranged on the gas phase pipeline 11, a temperature transmitter 31 is arranged on the outlet end of the air temperature type heater 3, two branch pipelines are led out to be respectively connected with the inlet end of the electric heating reheater 4 and the inlet end of the CNG compressor 5, the two branch pipelines are both provided with a switch valve 32, the outlet end of the electric heating reheater 4 is connected with the inlet end of the CNG compressor 5 through a first pipeline 41, the first pipeline 41 is sequentially provided with a temperature transmitter 31 and a switch valve 32, and the outlet end of the CNG compressor 5 is communicated with the CNG gas collecting tank 6 through the switch valve 32; the temperature transmitter 31, the switch valve 32, the electric heating reheater 4 and the CNG compressor 5 are respectively electrically connected with the control system.
Further, in order to control the opening and closing of the recovery device according to the pressure in the LNG tank, and to make the boil-off gas in the LNG tank 1 stably enter the air-temperature heater of the recovery device; the air inlet pipeline 2 is sequentially provided with an opening adjusting valve 21 and a pressure transmitter 22, and the opening adjusting valve 21 and the pressure transmitter 22 are respectively electrically connected with a control system.
Further, the air intake pipe 2 communicates with the gas phase line 11 through a low temperature metal hose 13. Through the cooperation of the low-temperature metal hose 13 and the movable travelling mechanism, the recovery device can be suitable for different storage modes and application scenes of the LNG tank.
Further, a relief valve 131 is provided in front of the opening degree adjustment valve 21. The residual pressure in the low-temperature metal hose 13 can be released by opening the pressure release valve 131, so that the low-temperature metal hose 3 can be conveniently detached.
Further, a check valve 51 is provided at the outlet end of the CNG compressor 5. Through the setting of check valve 51, can prevent that the interior gas of CNG gas collecting tank 6 from getting into CNG compressor 5, be favorable to keeping recovery unit's stability.
Further, a control valve 12 is arranged at the outlet end of the CNG gas collecting tank 6; the control valve 12 is a manual valve.
When the movable LNG tank box evaporation gas recovery device is used, the movable travelling mechanism is moved to a proper position according to the arrangement position of the LNG tank box 1, two ends of the low-temperature metal hose 13 are respectively connected with the gas phase pipeline 11 and the air inlet pipeline 2, and the opening degree regulating valve 21 and each switch valve 32 are opened to enable the LNG tank box 1 and the evaporation gas recovery device to form a communicated pipeline; after the preparation is completed, the control valve 12 on the gas phase pipeline 11 is opened, the control system receives the pressure detection value of the pressure transmitter 22 and compares the pressure detection value with the preset pressure maintaining value of the LNG tank 1, when the pressure detection value is larger than the pressure maintaining value, the control system controls the opening of the opening adjusting valve 21 to enable the boil-off gas in the LNG tank 1 to stably enter the air temperature type heater 3 of the recovery device, the heated boil-off gas is subjected to temperature detection through the temperature transmitter 31, the control system receives the temperature detection value of the temperature transmitter 31 and compares the temperature detection value with the inlet temperature requirement value of the CNG compressor 5, if the temperature detection value is not lower than the temperature requirement value, controlling the switch valve 32 on the branch line connected with the inlet end of the electric heating reheater to close, so that the evaporation gas flow directly enters the CNG compressor 5 through the switch valve 32 on the other branch line; if the temperature detection value is lower than the required inlet temperature value, controlling a switch valve 32 on a branch pipeline connected with the inlet end of the CNG compressor 5 to be closed and controlling an electric-heating reheater 4 to be opened, so that the evaporated gas enters the electric-heating reheater 4 to be heated for the second time, in order to ensure the overall operation safety of the recovery device, adopting a temperature transmitter 31 on a first pipeline 41 to detect the temperature of the secondarily heated evaporated gas, receiving the temperature detection value of the temperature transmitter 31 by a control system and comparing the temperature detection value with the required inlet temperature value of the CNG compressor 5, if the temperature detection value is still lower than the required inlet temperature value of the CNG compressor 5, controlling an opening degree regulating valve 21 to be closed until the temperature reaches the required inlet temperature value of the CNG compressor 5, and then controlling the opening degree regulating valve to be opened, and if the temperature is not lower than the required temperature value, directly entering the CNG compressor 5; the vaporized gas is pressurized by a CNG compressor 5, then the volume of the vaporized gas is reduced, and the vaporized gas enters a CNG gas collecting tank 6 for temporary storage. When the pressure detection value detected by the pressure transmitter 22 on the air inlet pipeline reaches the preset pressure maintaining value of the LNG tank 1, the control system controls the opening degree regulating valve 21, the electric heating reheater 4, the CNG compressor 5 and the switch valves 32 to be closed, the pressure relief valve 131 is opened to relieve the residual pressure in the low-temperature metal hose 13, then the low-temperature metal hose 13 is detached, and the recovery operation is finished. The CNG gas collection tank 6 is communicated with the outlet end of the CNG gas collection tank 6 and the control valve 12 is opened to comprehensively utilize the recovered CNG in the CNG gas collection tank 6.
The utility model discloses remove LNG tank case boil-off gas recovery unit except using in the airtight recovery of LNG tank case storage yard or other low temperature liquefied hydrocarbon tank case storage yards evaporation, also can use in other process systems that have the low temperature boil-off gas to produce, for example LNG gas station system, low temperature propane butane loading and unloading car system.
The above is only the preferred embodiment of the present invention, so all the equivalent changes or modifications made by the structure, features and principles in accordance with the claims of the present invention are included in the claims of the present invention.
Claims (7)
1. The utility model provides a remove LNG tank boil-off gas recovery unit, includes and removes running gear, its characterized in that, it is equipped with empty temperature formula heater (3) on the running gear to remove, the entrance point of empty temperature formula heater (3) is through gas phase line (11) intercommunication of air inlet pipeline (2) and LNG tank (1), be equipped with control valve (12) on gas phase line (11), be equipped with temperature transmitter (31) on the exit end of empty temperature formula heater (3) and draw forth two bleeder lines respectively with the entrance point of electric heat recuperator (4), the entrance point connection of CNG compressor (5), all be equipped with ooff valve (32) on two bleeder lines, the exit end of electric heat recuperator (4) is connected through the entrance point of first pipeline (41) and CNG compressor (5), be equipped with temperature transmitter (31) on first pipeline (41) in proper order, The outlet end of the CNG compressor (5) is communicated with the CNG gas collecting tank (6) through the switch valve (32); the temperature transmitter (31), the switch valve (32), the electric heating reheater (4) and the CNG compressor (5) are respectively electrically connected with the control system.
2. The boil-off gas recovery device for the mobile LNG tank as claimed in claim 1, wherein the inlet pipeline (2) is sequentially provided with an opening degree adjusting valve (21) and a pressure transmitter (22), and the opening degree adjusting valve (21) and the pressure transmitter (22) are respectively electrically connected with a control system.
3. The mobile LNG tank boil-off gas recovery device according to claim 2, characterized in that the gas inlet line (2) is in communication with the gas phase line (11) through a cryogenic metal hose (13).
4. The mobile LNG tank boil-off gas recovery device of claim 3, wherein a pressure relief valve (131) is arranged in front of the opening degree adjusting valve (21).
5. The mobile LNG tank boil-off gas recovery device of claim 1, wherein the outlet end of the CNG compressor (5) is further provided with a check valve (51).
6. The mobile LNG tank boil-off gas recovery device of claim 1, characterized in that the outlet end of the CNG gas collection tank (6) is provided with a control valve (12).
7. The mobile LNG tank boil-off gas recovery device of claim 6, characterized in that the control valve (12) is a manual valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120641761.0U CN214580442U (en) | 2021-03-30 | 2021-03-30 | Remove LNG tank evaporating gas recovery unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120641761.0U CN214580442U (en) | 2021-03-30 | 2021-03-30 | Remove LNG tank evaporating gas recovery unit |
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| Publication Number | Publication Date |
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| CN214580442U true CN214580442U (en) | 2021-11-02 |
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| CN202120641761.0U Active CN214580442U (en) | 2021-03-30 | 2021-03-30 | Remove LNG tank evaporating gas recovery unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118031109A (en) * | 2024-03-19 | 2024-05-14 | 烟台东德实业有限公司 | A method for electromagnetic reversing control pressurization of LNG storage tanks |
-
2021
- 2021-03-30 CN CN202120641761.0U patent/CN214580442U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118031109A (en) * | 2024-03-19 | 2024-05-14 | 烟台东德实业有限公司 | A method for electromagnetic reversing control pressurization of LNG storage tanks |
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