CN213746145U

CN213746145U - Low temperature storage tank interface valve group system of LNG vaporizing station

Info

Publication number: CN213746145U
Application number: CN202022371640.7U
Authority: CN
Inventors: 宋朋飞; 庞璐; 刘芷含; 王振宇
Original assignee: Changchun Gas Thermal Design And Research Institute Co ltd
Current assignee: Changchun Gas Thermal Design And Research Institute Co ltd
Priority date: 2020-10-22
Filing date: 2020-10-22
Publication date: 2021-07-20
Anticipated expiration: 2030-10-22

Abstract

A low-temperature storage tank interface valve group system of an LNG (liquefied natural gas) gasification station is characterized by comprising a liquid inlet main pipe part and a liquid outlet main pipe part, wherein the liquid inlet main pipe part comprises two branches, one branch is connected with a pressurization liquid inlet pipe of an LNG storage tank, a valve (4) is arranged on the liquid inlet main pipe of the storage tank pressurization and connected to a connector (B), the other branch is provided with a starting emergency cut-off valve (3), the valve (3) is provided with ZSOV and VIC, a valve (1) and a valve (2) are arranged at the downstream of the valve (3) and respectively communicated with an upper liquid inlet main pipe and a lower liquid inlet main pipe of the storage tank and connected to a connector (C) and a connector (D), the connector (C) is connected with an upper liquid inlet of the storage tank, and the connector (D) is connected with a lower liquid inlet of the storage tank; the gas phase pipe is connected with a gas phase port of the storage tank through a connector (E), the gas phase pipe is a bidirectional vent pipe, and a gas inlet pipe in the gas inlet direction is connected with the connector (E) and the storage tank through a connector (I) connected with a supercharger of the storage tank, is provided with a valve (7) at the downstream of the connector (I), and is then connected with the connector (E) and connected with the storage tank.

Description

Low temperature storage tank interface valve group system of LNG vaporizing station

Technical Field

The utility model relates to a LNG vaporizing station low temperature storage tank interface valve group system belongs to LNG vaporizing station control system field.

Background

At present, inlet and outlet pipelines of a storage tank in a conventional LNG gasification station are criss-cross, the horizontal width of the tiled pipelines is between 1000mm and 1400mm, the valves are difficult to operate, the pipelines need to be independently made to span the ladder, the overall attractiveness is affected, and potential safety hazards exist.

SUMMERY OF THE UTILITY MODEL

In order to solve the weak point and the shortcoming that exist, the utility model provides a LNG vaporizing station low temperature storage tank interface valve group system.

The utility model discloses a solve the technical scheme that technical problem adopted as follows:

a low-temperature storage tank interface valve group system of an LNG gasification station is characterized by comprising a liquid inlet main pipe part and a liquid outlet main pipe part, wherein the liquid inlet main pipe part comprises two branches, one branch is connected with a pressurization liquid inlet pipe of an LNG storage tank, a valve IV is arranged on the liquid inlet main pipe of a storage tank booster and connected to a connector II, the other branch is provided with an emergency cut-off valve III, a ZSOV and a VIC are arranged at the third position of the emergency cut-off valve, the ZSOV is used for controlling a pneumatic emergency cut-off valve, the VIC is used for feeding back the valve position of the pneumatic emergency cut-off valve, a valve I and a valve II are arranged at the downstream of the third position of the emergency cut-off valve and respectively led to an upper liquid inlet main pipe and a lower liquid inlet main pipe of the storage tank and connected to a connector III and a connector IV, the connector III is connected with an upper liquid inlet of the storage tank, and the connector IV is connected with a lower liquid inlet of the storage tank; the gas phase pipe is connected with a gas phase port of the storage tank through a fifth interface, the gas phase pipe is a bidirectional vent pipe, a gas inlet pipe in the gas inlet direction is connected with a storage tank supercharger through a ninth interface connected with the storage tank supercharger, a seventh valve is arranged at the downstream of the ninth interface and then connected with the fifth interface and then connected with the storage tank, a eighth valve, a ninth valve, a tenth valve and a eleventh valve are arranged in the gas outlet direction, the eighth valve is a bypass passage of the ninth valve, the tenth valve and the eleventh valve, namely the eighth valve is connected with the ninth valve, the tenth valve and the eleventh valve in parallel, the eleventh valve is a pressure detection valve for detecting the pressure of gas in the gas phase pipe, and if the pressure is higher than a set value, the eleventh valve is automatically opened and is connected with a BOG pipeline through the tenth interface to pour the gas into the BOG pipeline, so that the pressure reduction function of the storage tank is realized; the sixth interface connects the liquid outlet pipe with a liquid outlet of the storage tank, a fifth emergency cut-off valve is arranged at the downstream of the liquid outlet pipe, the fifth emergency cut-off valve is a starting valve, ZOV and VIC are arranged at the fifth emergency cut-off valve, a sixth valve is arranged at the downstream of the fifth emergency cut-off valve, the sixth valve is a manual valve and then is connected with the eighth interface, and the eighth interface is communicated with a liquid outlet main pipe; the first safety valve bank is arranged at the upstream of the third emergency cut-off valve of the liquid inlet main pipe, the first safety valve bank is opened when the pipeline pressure is higher than a set value, a small amount of low-temperature liquid enters the diffusing pipe, and the diffusing pipe is connected with the diffusing main pipe through a seventh connector; when the third emergency cut-off valve, the first emergency cut-off valve and the second emergency cut-off valve are closed simultaneously, a closed pipeline is generated among the third emergency cut-off valve, the first emergency cut-off valve and the second emergency cut-off valve, and the pipeline has the possibility of exceeding the design pressure, so that a second safety valve bank is arranged among the third emergency cut-off valve, the first emergency cut-off valve and the second emergency cut-off valve, the second safety valve bank is opened when the pipeline pressure is higher than a set value, a small amount of low-temperature liquid enters a bleeding pipe, and the bleeding pipe is connected with a bleeding main pipe through a seventh connector; when the emergency cut-off valve five and the emergency cut-off valve six are closed simultaneously, a closed pipeline is generated between the emergency cut-off valve five and the emergency cut-off valve six, and the pipeline has the possibility of exceeding the design pressure, so a safety valve group III is arranged between the emergency cut-off valve five and the emergency cut-off valve six, the safety valve group III is opened when the pipeline pressure is higher than a set value, a small amount of low-temperature liquid enters a bleeding pipe, and the bleeding pipe is connected with a bleeding main pipe through a connector seven; and a fourth safety valve group and a fifth safety valve group which are connected in parallel are arranged at the downstream of the gas-phase pipe, when the pressure of the gas-phase pipe is higher than a set value, the fourth safety valve group and the fifth safety valve group are simultaneously opened, redundant gas is discharged into the bleeding pipe and is connected with the bleeding main pipe through a seventh interface, and if one of the valves fails, the other valve can still ensure normal work and system safety.

The utility model discloses the beneficial effect who reaches is: 14 valves of storage tank interface and 4 groups of relief valves (safe diffusion + manual diffusion) are combined into a system, vacuum tubes are adopted in the system for heat preservation, and pipelines and valves are arranged in a layered mode, so that functional requirements are met, space is reduced, and operation is facilitated.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic diagram of the present invention.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, 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 work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships 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.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

As shown in fig. 1, a cryogenic storage tank interface valve block system of an LNG gasification station comprises a liquid inlet main pipe part and a liquid outlet main pipe part, wherein the liquid inlet main pipe part comprises two branches, one branch is connected with a pressurized liquid inlet pipe of the LNG storage tank, a valve IV 4 is arranged on a liquid inlet main pipe of the storage tank pressurized liquid inlet and connected to a connector II, the other branch is provided with an emergency cut-off valve III 3, ZSOV and VIC are arranged at the third emergency cut-off valve 3, the ZSOV is used for controlling the pneumatic emergency cut-off valve (the valve switch can be remotely controlled in the control chamber), the VIC is used for feeding back the valve position of the pneumatic emergency cut-off valve (the valve switch state can be observed in the control chamber), a first valve 1 and a second valve 2 are arranged at the downstream of the third emergency cut-off valve 3 and are respectively communicated with an upper liquid inlet main pipe and a lower liquid inlet main pipe of the storage tank and connected to a third connector C and a fourth connector D, the third connector C is connected with an upper liquid inlet of the storage tank, and the fourth connector D is connected with a lower liquid inlet of the storage tank; the gas phase pipe is connected with a gas phase port of the storage tank through a connector five E, the gas phase pipe is a bidirectional vent pipe, a gas inlet pipe in the gas inlet direction passes through a connector nine I connected with a storage tank supercharger, a valve seven 7 is arranged at the downstream of the connector nine I and then is connected to the connector five E and is connected with the storage tank, a valve eight 8, a valve nine 9, a valve ten 10 and a valve eleven 11 are combined in the gas outlet direction, the valve eight 8 is a bypass passage formed by combining the valve nine 9, the valve ten 10 and the valve eleven 11, namely the valve eight 8, the valve nine 9, the valve ten 10 and the valve eleven 11 are combined in parallel, the valve eleven 11 is a pressure detection valve for detecting the pressure of gas in the gas phase pipe, and if the pressure is higher than a set value, the valve eleven 11 is automatically opened and is connected with a BOG pipeline through a connector decaJ to pour the gas into the BOG pipeline, so that the function of reducing the pressure of the storage tank is realized; a sixth interface F connects the liquid outlet pipe with a liquid outlet of the storage tank, a fifth emergency cut-off valve 5 is arranged at the downstream of the liquid outlet pipe, the fifth emergency cut-off valve 5 is a starting valve, ZSOV and VIC are arranged at the fifth emergency cut-off valve 5, a sixth valve 6 is arranged at the downstream of the fifth emergency cut-off valve 5, the sixth valve 6 is a manual valve and is connected with an eighth interface H, and the eighth interface H is communicated with a liquid outlet main pipe; the first safety valve bank 21 is arranged at the upstream of the third emergency cut-off valve 3 of the liquid inlet main pipe, when the pipeline pressure is higher than a set value, the first safety valve bank 21 is opened, a small amount of low-temperature liquid enters the diffusing pipe, and the diffusing pipe is connected with the diffusing main pipe through a connector seven G; when the emergency cut-off valve III 3, the valve I1 and the valve II 2 are closed simultaneously, a closed pipeline is generated between the emergency cut-off valve III 3, the valve I1 and the valve II 2, and the pipeline has the possibility of exceeding the design pressure, so that a safety valve group II 22 is arranged between the emergency cut-off valve III 3, the valve I1 and the valve II 2, the safety valve group II 22 is opened when the pipeline pressure is higher than a set value, a small amount of low-temperature liquid enters a bleeding pipe, and the bleeding pipe is connected with a bleeding main pipe through a connector seven G; when the emergency cut-off valve five 5 and the emergency cut-off valve six 6 are closed simultaneously, a closed pipeline is generated between the emergency cut-off valve five 5 and the emergency cut-off valve six 6, and the pipeline has the possibility of exceeding the design pressure, so a safety valve group three 23 is arranged between the emergency cut-off valve five 5 and the emergency cut-off valve six 6, the safety valve group three 23 is opened when the pipeline pressure is higher than a set value, a small amount of low-temperature liquid enters a bleeding pipe, and the bleeding pipe is connected with a bleeding main pipe through a connector seven G; a plurality of safety valve groups connected in parallel are arranged at the downstream of the gas phase pipe, preferably two safety valve groups are arranged, namely a safety valve group four 24 and a safety valve group five 25, when the pressure of the gas phase pipe is higher than a set value, the safety valve group four 24 and the safety valve group five 25 are simultaneously opened, redundant gas is discharged into the bleeding pipe and is connected with the bleeding main pipe through a connector seven G, and if one of the safety valve groups fails, the other safety valve group can still ensure normal work and ensure system safety.

And (3) system diffusing flow: when the pressure in the pipeline is higher than the set value of the safety valve, the first safety valve group 21 is opened, and a small amount of low-temperature liquid enters the diffusing and collecting pipe through the first safety valve group 21 and is collected to a valve group prying port seventh G; when the pneumatic emergency cut-off valve III 3 and the manual stop valve I1 and the manual stop valve II 2 are closed simultaneously, LNG in a sealed pipe section is formed in the middle for natural gasification, and the pressure in a pipeline can reach the pipeline design pressure and is even higher than the design pressure, so that a safety valve group II 22 is arranged on the pipeline between the pneumatic emergency cut-off valve III 3 and the manual stop valve I1 and the valve II 2, when the pressure in the pipeline is higher than the set value of the safety valve, the safety valve is opened, and a small amount of low-temperature liquid enters the diffusing and collecting pipe through the safety valve and is collected to a valve group prying connector seven G; when the pneumatic emergency cut-off valve five 5 and the manual stop valve six 6 are closed simultaneously, LNG in a sealed pipe section is formed in the middle of the valve section and is naturally gasified, and the pressure in a pipeline can reach the pipeline design pressure and is even higher than the design pressure, so that a safety valve group III 23 is arranged on the pipeline between the pneumatic emergency cut-off valve five 5 and the manual stop valve six 6, when the pressure in the pipeline is higher than the set value of the safety valve, the safety valve is opened, and a small amount of low-temperature liquid enters the diffusing and collecting pipe through the safety valve and is collected to a valve group pry connector seven G; the downstream of the valve bank pry interface five E is provided with a manual stop valve twelve 12, a safety valve four 24 and a safety valve five 25 to ensure the safety of the LNG storage tank and prevent the safety valve from failure, so that two groups of safety valve banks are arranged, namely the safety valve four 24 and the safety valve five 25, the manual stop valve twelve 12, the safety valve four 24 and the safety valve five 25 are in parallel connection, when the pressure in the storage tank is higher than a set value of the safety valve, the safety valve is opened, a large amount of low-temperature gas enters the diffusing and collecting pipe through the safety valve and is collected to a valve bank pry interface seven G, when the pressure in the storage tank needs to be manually relieved, the manual stop valve twelve 12 is manually opened (normally, the manual stop valve twelve 12 is in a normally closed state), and a large amount of low-temperature gas enters the diffusing and collecting pipe through the safety valve and is collected to a valve bank pry interface seven G so as to realize the function of reducing the pressure of the storage tank; the diffusing collecting pipe is connected to a valve bank pry port seven G, and the port seven G is connected to an EAG diffusing main pipe of the station; interface A is connected with the liquid outlet of LNG transport tank car, and interface two B is connected with the liquid phase import of the storage tank booster outside the system, and interface seven G is connected with the total pipe of diffusing, and interface eight H is connected with the liquid outlet total pipe, and interface nine I is connected with the gaseous phase export of storage tank booster.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A low-temperature storage tank interface valve group system of an LNG gasification station is characterized by comprising a liquid inlet main pipe part and a liquid outlet main pipe part, wherein the liquid inlet main pipe part comprises two branches, one branch is connected with a pressurization liquid inlet pipe of an LNG storage tank, a valve IV is arranged on the liquid inlet main pipe of a storage tank booster and connected to a connector II, the other branch is provided with an emergency cut-off valve III, a ZSOV and a VIC are arranged at the third position of the emergency cut-off valve, the ZSOV is used for controlling a pneumatic emergency cut-off valve, the VIC is used for feeding back the valve position of the pneumatic emergency cut-off valve, a valve I and a valve II are arranged at the downstream of the third position of the emergency cut-off valve and respectively led to an upper liquid inlet main pipe and a lower liquid inlet main pipe of the storage tank and connected to a connector III and a connector IV, the connector III is connected with an upper liquid inlet of the storage tank, and the connector IV is connected with a lower liquid inlet of the storage tank; the gas phase pipe is connected with a gas phase port of the storage tank through a fifth interface, the gas phase pipe is a bidirectional vent pipe, a gas inlet pipe in the gas inlet direction is connected with a storage tank supercharger through a ninth interface connected with the storage tank supercharger, a seventh valve is arranged at the downstream of the ninth interface and then connected with the fifth interface and then connected with the storage tank, a eighth valve, a ninth valve, a tenth valve and a eleventh valve are arranged in the gas outlet direction, the eighth valve is a bypass passage of the ninth valve, the tenth valve and the eleventh valve, namely the eighth valve is connected with the ninth valve, the tenth valve and the eleventh valve in parallel, the eleventh valve is a pressure detection valve for detecting the pressure of gas in the gas phase pipe, and if the pressure is higher than a set value, the eleventh valve is automatically opened and is connected with a BOG pipeline through the tenth interface to pour the gas into the BOG pipeline, so that the pressure reduction function of the storage tank is realized; the sixth interface connects the liquid outlet pipe with a liquid outlet of the storage tank, a fifth emergency cut-off valve is arranged at the downstream of the liquid outlet pipe, the fifth emergency cut-off valve is a starting valve, ZOV and VIC are arranged at the fifth emergency cut-off valve, a sixth valve is arranged at the downstream of the fifth emergency cut-off valve, the sixth valve is a manual valve and then is connected with the eighth interface, and the eighth interface is communicated with a liquid outlet main pipe; the first safety valve bank is arranged at the upstream of the third emergency cut-off valve of the liquid inlet main pipe, the first safety valve bank is opened when the pipeline pressure is higher than a set value, a small amount of low-temperature liquid enters the diffusing pipe, and the diffusing pipe is connected with the diffusing main pipe through a seventh connector; when the third emergency cut-off valve, the first emergency cut-off valve and the second emergency cut-off valve are closed simultaneously, a closed pipeline is generated among the third emergency cut-off valve, the first emergency cut-off valve and the second emergency cut-off valve, and the pipeline has the possibility of exceeding the design pressure, so that a second safety valve bank is arranged among the third emergency cut-off valve, the first emergency cut-off valve and the second emergency cut-off valve, the second safety valve bank is opened when the pipeline pressure is higher than a set value, a small amount of low-temperature liquid enters a bleeding pipe, and the bleeding pipe is connected with a bleeding main pipe through a seventh connector; when the emergency cut-off valve five and the emergency cut-off valve six are closed simultaneously, a closed pipeline is generated between the emergency cut-off valve five and the emergency cut-off valve six, and the pipeline has the possibility of exceeding the design pressure, so a safety valve group III is arranged between the emergency cut-off valve five and the emergency cut-off valve six, the safety valve group III is opened when the pipeline pressure is higher than a set value, a small amount of low-temperature liquid enters a bleeding pipe, and the bleeding pipe is connected with a bleeding main pipe through a connector seven; and a fourth safety valve group and a fifth safety valve group which are connected in parallel are arranged at the downstream of the gas-phase pipe, when the pressure of the gas-phase pipe is higher than a set value, the fourth safety valve group and the fifth safety valve group are simultaneously opened, redundant gas is discharged into the bleeding pipe and is connected with the bleeding main pipe through a seventh interface, and if one of the valves fails, the other valve can still ensure normal work and system safety.