CN219955054U - LNG pressure relief and emptying system - Google Patents
LNG pressure relief and emptying system Download PDFInfo
- Publication number
- CN219955054U CN219955054U CN202321120795.0U CN202321120795U CN219955054U CN 219955054 U CN219955054 U CN 219955054U CN 202321120795 U CN202321120795 U CN 202321120795U CN 219955054 U CN219955054 U CN 219955054U
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- China
- Prior art keywords
- pipe
- lng
- blow
- natural gas
- thick film
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 134
- 239000003345 natural gas Substances 0.000 claims abstract description 57
- 238000010438 heat treatment Methods 0.000 claims abstract description 31
- 210000004907 gland Anatomy 0.000 claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 15
- 239000000919 ceramic Substances 0.000 claims abstract description 13
- 238000002485 combustion reaction Methods 0.000 claims abstract description 13
- 239000003054 catalyst Substances 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- 238000001816 cooling Methods 0.000 claims description 14
- 239000000498 cooling water Substances 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 5
- 230000002265 prevention Effects 0.000 claims description 4
- 239000011490 mineral wool Substances 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 abstract description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007084 catalytic combustion reaction Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Pipeline Systems (AREA)
Abstract
The utility model discloses an LNG pressure relief and emptying system, which comprises: LNG storage tank, LNG pipeline and blow-down pipe are provided with a plurality of relief valves along axial interval on the blow-down pipe, and each relief valve passes through the second connecting pipe and links to each other with each LNG pipeline respectively, is connected with the natural gas combustor on the blow-down pipe, the natural gas combustor includes: the fire-proof heating device comprises a shell, wherein a thick film heating pipe is sleeved in the shell, a fire-proof heat-insulating layer is filled between the shell and the thick film heating pipe, a ceramic pipe and a metal plate are sleeved in the thick film heating pipe, a plurality of ventilation holes are formed in the metal plate, a combustion catalyst is arranged in part of the ventilation holes, a gland is connected to the shell through threads, and an exhaust hole is formed in the gland. The utility model is convenient for the overhaul of the safety valve in the later period, and can fully burn the low-concentration natural gas to ensure that the natural gas is discharged without public hazard.
Description
Technical Field
The utility model relates to the field of pressure vessels, in particular to an LNG pressure relief and emptying system.
Background
When using LNG as the fuel use, need connect a plurality of LNG pipelines on the LNG storage tank, LNG in the LNG storage tank gasifies into gaseous natural gas through the gasification jar, then carries through the LNG pipeline, in order to protect the LNG pipeline, need set up a relief valve on every LNG pipeline, then link to each other relief valve and blow-down pipe, when the natural gas pressure in the LNG pipeline exceeds the prescribed value, the relief valve can be pushed up, partial natural gas in the LNG pipeline will enter into the blow-down pipe through the relief valve and blow down. The positional relationship between the safety valve and the LNG pipeline and the blow-down pipe in the market is shown in fig. 1, the safety valve is installed close to the LNG pipeline, that is to say, the safety valve is arranged along with the LNG pipeline, because each LNG pipeline is arranged for avoiding each other or saving space, the arrangement between each LNG pipeline is staggered and complicated, the arrangement between each LNG pipeline is irregular, so that the arrangement of each safety valve is irregular, when the safety valve is overhauled in the later stage, the worker is required to enter the LNG pipeline for corresponding operation, the LNG pipeline is staggered and complicated, the worker is difficult to enter the LNG pipeline, and the overhauling work in the later stage is unfavorable.
Because the main component of natural gas is methane, methane is an active greenhouse gas, and if methane is directly discharged into the air, the environment is polluted, so that a flare system is generally arranged on the blow-down pipe, and when the natural gas passes through the flare system, the flare system ignites the natural gas, so that the natural gas is combusted to produce carbon dioxide and water. Because the natural gas leakage from the LNG pipeline is small, the natural gas concentration in the blow-down pipe is low, when the natural gas concentration is low, the conventional torch system needs an extremely high ignition point to ignite the natural gas, and the low-concentration natural gas discharged from the blow-down pipe can be burnt out after the torch system is always in a burning state, but the resource waste can be caused when the natural gas is always in the burning state.
Disclosure of Invention
The utility model aims to provide an LNG pressure relief and emptying system which is convenient for later maintenance and can be used for igniting low-concentration natural gas.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: LNG pressure release blowdown system includes: LNG storage tank, LNG pipeline and blow-down pipe are provided with a plurality of relief valves along axial interval on the blow-down pipe, and each relief valve flushes along the axial of blow-down pipe, and the exit end of relief valve links to each other with the blow-down pipe through first connecting pipe, is connected with a second connecting pipe respectively on the entrance point of each relief valve, and each second connecting pipe links to each LNG pipeline respectively, is connected with the natural gas combustor on the blow-down pipe, the natural gas combustor includes: the shell, be equipped with the thick film heating pipe in the casing, it has the fire prevention insulating layer to fill between casing and thick film heating pipe, it is equipped with two ceramic pipes to overlap in the thick film heating pipe, press from both sides and be equipped with the metal sheet between two ceramic pipes, the metal sheet contacts with the thick film heating pipe, be provided with a plurality of bleeder vents on the metal sheet, be provided with combustion catalyst in some bleeder vents, threaded connection has the gland on the casing of keeping away from blow-down pipe one end, the gland supports and leans on fire prevention insulating layer, thick film heating pipe and a ceramic pipe, exhaust hole has been seted up on the gland.
Further, in the LNG pressure relief and evacuation system, different serial numbers are respectively provided on each LNG line, and the same serial number as the corresponding LNG line is provided on each safety valve.
Further, the LNG pressure relief and emptying system is characterized in that a joint pipe is arranged between the emptying pipe and the natural gas burner, the joint pipe is connected with a shell of the natural gas burner, a water cooling pipe is wound on the joint pipe, one end of the water cooling pipe is connected with a water pump, and the other end of the water cooling pipe is connected with a uniform cooling water source for water inflow of the water pump.
Further, the LNG pressure relief and emptying system is characterized in that a one-way valve is arranged between the joint pipe and the emptying pipe, a temperature sensor is arranged on the shell close to one end of the joint pipe, and the temperature sensor is electrically connected with the water pump through the central control unit.
Further, the LNG pressure relief and emptying system is characterized in that a natural gas sensor is arranged on the emptying pipe and is electrically connected with the thick film heating pipe through the central control unit.
Further, in the LNG pressure relief vent system, a handle is screwed to the gland.
Further, in the LNG pressure relief vent system, the fireproof heat insulation layer is rock wool.
The utility model has the advantages that: the safety valve is connected with the blow-down pipe along the axial direction of the blow-down pipe, so that a worker can overhaul and maintain the safety valve only at the blow-down pipe without entering each LNG pipeline, and the working efficiency is improved; the leaked natural gas enters the natural gas burner and contacts with the combustion catalyst, so that the combustion activity of methane in the natural gas can be improved, the methane can be ignited at a lower temperature, the low-concentration natural gas can be rapidly ignited, and the low-concentration natural gas can be fully combusted in the natural gas burner to form carbon dioxide and water to be discharged.
Drawings
Fig. 1 is a schematic view of a part of the structure of a conventional LNG pressure relief vent system.
Fig. 2 is a schematic view of a part of the structure of the LNG pressure relief vent system according to the present utility model.
Fig. 3 is a schematic view of a part of the structure in the plan view in fig. 2.
Fig. 4 is a schematic view of the natural gas burner of fig. 2.
Fig. 5 is a schematic view of the structure of the metal plate in fig. 4.
Detailed Description
The technical scheme of the utility model is further described below with reference to the attached drawings and the preferred embodiments.
As shown in fig. 2 to 5, the LNG pressure relief vent system according to the present utility model includes: LNG storage tank, LNG pipeline 1 and blow-down pipe 2 are provided with a plurality of relief valves 21 along axial interval on blow-down pipe 2, and each relief valve 21 flushes along the axial of blow-down pipe 2, and the exit end of relief valve 21 links to each other with blow-down pipe 2 through first connecting pipe 211, is connected with a second connecting pipe 212 respectively on the entrance point of each relief valve 21, and each second connecting pipe 212 links to each LNG pipeline 1 respectively, is provided with different serial numbers respectively on each LNG pipeline 1, is provided with the same serial number with corresponding LNG pipeline 1 on each relief valve 21. When overhauling relief valve 21, the staff only need just can close corresponding LNG pipeline 1 according to the serial number on the relief valve 21, and the staff just can overhaul the work to corresponding relief valve 21 in blow-down pipe 2 department, does not need the staff to enter into in the LNG pipeline 1, has greatly improved work efficiency.
The natural gas burner is characterized in that a natural gas sensor 22 and a check valve 23 are arranged on the blow-down pipe 2, a joint pipe 3 is connected to the check valve 23, a water cooling pipe 31 is wound on the joint pipe 3, one end of the water cooling pipe 31 is connected with a water pump 32, the other end of the water cooling pipe 31 and the water inlet end of the water pump 32 are connected with a cooling water source, the water pump 32 sends cooling water in the cooling water source into the water cooling pipe 31 and then flows back into the cooling water source from the water cooling pipe 31, so that the cooling water circulates in the water cooling pipe 31, a natural gas burner 4 is connected to the joint pipe 3, the check valve 23 is normally in a normally open state, when the natural gas burner 4 needs to be overhauled, the check valve 23 needs to be closed, and the natural gas burner 4 comprises: a housing 41 connected to the socket pipe 3, a thick film heating pipe 42 is sleeved in the housing 41, the thick film heating pipe 42 is electrically connected with the natural gas sensor 22 through a central control unit, rock wool is filled between the housing 41 and the thick film heating pipe 42 as a fireproof heat insulation layer 43, two ceramic pipes 44 are sleeved in the thick film heating pipe 42, a metal plate 45 is clamped between the two ceramic pipes 44, the metal plate 45 is contacted with the thick film heating pipe 42, a plurality of ventilation holes 451 are arranged on the metal plate 45, a combustion catalyst 452 is arranged in part of the ventilation holes 451, and the combustion catalyst 452 is ZrO introduced with any transition metal of Mn, co, cr or Fe 2 (refer to the article "research progress of methane catalytic combustion mechanism and catalyst"), a gland 46 is screwed on the housing 41 at the end far from the adapter tube 3, the gland 46 is abutted against the fireproof heat insulation layer 43, the thick film heating tube 42 and one ceramic tube 44, thereby fixing the fireproof heat insulation layer 43, the thick film heating tube 42, the two ceramic tubes 44 and the metal plate 45 between the two ceramic tubes 44 in the housing 41, the gland 46 is provided with a vent hole 461, a handle 462 is screwed on the gland 46, the handle 462 can be held to facilitate the rotation of the gland 46, and the method is characterized in thatThe gland 46 is conveniently in threaded connection with the housing 41, a temperature sensor 47 is arranged on the housing 41 near one end of the adapter tube 3, and the temperature sensor 47 is electrically connected with the water pump 32 through the central control unit.
Except for the need of closing the one-way valve 23 when the natural gas burner 4 is overhauled and maintained, the one-way valve 23 is normally opened under other conditions, when the pressure of the natural gas in any one or more LNG pipelines 1 is increased to jack up the corresponding safety valve 21, part of the natural gas in the LNG pipeline 1 enters the blow-down pipe 2 through the corresponding safety valve 21, the natural gas flows along the blow-down pipe 2, when the natural gas sensor 22 on the blow-down pipe 2 senses the natural gas in the blow-down pipe 2, the natural gas sensor 22 sends a signal to the central control unit, the central control unit controls the thick film heating pipe 42 to rapidly heat, the heating rate of the thick film heating pipe 42 can reach 200-250 ℃/S, the thick film heating pipe 42 transfers heat to the metal plate 45 to heat the combustion catalyst 452 in the metal plate 45, the catalytic activity of the combustion catalyst 452 is improved, the natural gas enters the shell 41 through the connecting pipe 3 to contact with the combustion catalyst 452, the combustion activity of methane in the natural gas contacting with the combustion catalyst 452 is improved, the part of methane can be ignited at a lower temperature, namely, the part of methane can be ignited at a temperature heated by the thick film heating pipe 42, the ignited methane can continuously ignite the natural gas, so that the natural gas is fully combusted, carbon dioxide and water vapor are formed to be discharged outwards through the exhaust hole 461 on the gland 46, the flame during the natural gas combustion does not influence the thick film heating pipe 42 due to the blocking protection of the ceramic pipe 44, when the temperature sensor 47 senses that the temperature reaches a set threshold value, the temperature sensor 47 sends a signal to the central control unit, the central control unit controls the water pump 32 to pump water, the cooling water circulates in the water cooling pipe 31, the cooling pipe 3 dissipates heat, the high temperature on the housing 41 is prevented from being transferred to the check valve 23 through the adapter tube 3 to damage the check valve 23. When the natural gas sensor 22 does not sense natural gas, the central control unit controls the thick film heating pipe 42 to stop heating, and the natural gas entering the shell 41 is continuously ignited by burning flame until no natural gas enters the shell 41 again, the burning is stopped, when the temperature on the shell 41 is reduced to the set threshold value of the temperature sensor 47, the central control unit controls the water pump 32 to stop pumping, and the shell 41 and the faucet pipe 3 are naturally cooled.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the utility model without departing from the spirit and scope of the utility model, which is intended to be covered by the claims.
Claims (7)
- LNG pressure release blowdown system includes: LNG storage tank, LNG pipeline and blow-down pipe, its characterized in that: a plurality of relief valves are arranged on the blow-down pipe along the axial interval, each relief valve is flush along the axial of the blow-down pipe, the outlet end of each relief valve is connected with the blow-down pipe through a first connecting pipe, a second connecting pipe is respectively connected with the inlet end of each relief valve, each second connecting pipe is respectively connected with each LNG pipeline, a natural gas burner is connected on the blow-down pipe, the natural gas burner comprises: the shell, be equipped with the thick film heating pipe in the casing, it has the fire prevention insulating layer to fill between casing and thick film heating pipe, it is equipped with two ceramic pipes to overlap in the thick film heating pipe, press from both sides and be equipped with the metal sheet between two ceramic pipes, the metal sheet contacts with the thick film heating pipe, be provided with a plurality of bleeder vents on the metal sheet, be provided with combustion catalyst in some bleeder vents, threaded connection has the gland on the casing of keeping away from blow-down pipe one end, the gland supports and leans on fire prevention insulating layer, thick film heating pipe and a ceramic pipe, exhaust hole has been seted up on the gland.
- 2. The LNG pressure relief vent system of claim 1, wherein: each LNG line is provided with a different serial number, and each safety valve is provided with the same serial number as the corresponding LNG line.
- 3. The LNG pressure relief vent system of claim 1 or 2, wherein: a connecting pipe is arranged between the blow-down pipe and the natural gas burner, the connecting pipe is connected with a shell of the natural gas burner, a water cooling pipe is wound on the connecting pipe, one end of the water cooling pipe is connected with a water pump, and the other end of the water cooling pipe is connected with a uniform cooling water source for water inflow of the water pump.
- 4. The LNG pressure relief vent system of claim 3, wherein: a one-way valve is arranged between the joint pipe and the blow-down pipe, a temperature sensor is arranged on the shell close to one end of the joint pipe, and the temperature sensor is electrically connected with the water pump through the central control unit.
- 5. The LNG pressure relief vent system of claim 4, wherein: the blow-down pipe is provided with a natural gas sensor which is electrically connected with the thick film heating pipe through the central control unit.
- 6. The LNG pressure relief vent system of claim 1, wherein: the gland is connected with a handle in a threaded manner.
- 7. The LNG pressure relief vent system of claim 1, wherein: the fireproof heat insulation layer is rock wool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321120795.0U CN219955054U (en) | 2023-05-11 | 2023-05-11 | LNG pressure relief and emptying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321120795.0U CN219955054U (en) | 2023-05-11 | 2023-05-11 | LNG pressure relief and emptying system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219955054U true CN219955054U (en) | 2023-11-03 |
Family
ID=88554107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321120795.0U Active CN219955054U (en) | 2023-05-11 | 2023-05-11 | LNG pressure relief and emptying system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219955054U (en) |
-
2023
- 2023-05-11 CN CN202321120795.0U patent/CN219955054U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |