CN211551161U - High-integrity pressure protection system for external transmission pipeline after LNG receiving station is gasified - Google Patents
High-integrity pressure protection system for external transmission pipeline after LNG receiving station is gasified Download PDFInfo
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- CN211551161U CN211551161U CN201922215194.8U CN201922215194U CN211551161U CN 211551161 U CN211551161 U CN 211551161U CN 201922215194 U CN201922215194 U CN 201922215194U CN 211551161 U CN211551161 U CN 211551161U
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Abstract
The utility model relates to a high integrity pressure protection system of an external transmission pipeline after LNG receiving station gasification, which comprises a cut-off valve, a pressure transmitter and a logic processing controller; the cutoff valve and the pressure transmitter are sequentially arranged on a pipeline between the gasifier output main pipe and the output pipeline initial station; the logic processing controller is electrically connected with the stop valve and the pressure transmitter, the logic processing controller is right the pressure value detected by the pressure transmitter is logically judged and then controlled, the stop valve is turned off according to the preset pressure alarm value lower than the initial station design pressure of the external transmission pipeline, and the stop valve is used for controlling the continuously increased gas in the external transmission main pipe of the gasifier within the external transmission main pipe range of the gasifier without entering the initial station of the external transmission pipeline.
Description
Technical Field
The utility model relates to a high integrality pressure protection system of outer defeated pipeline after LNG receiving station gasification relates to Liquefied Natural Gas (LNG) technical field.
Background
The LNG receiving station is usually matched with or independently constructed as an external transmission pipeline initial station, and the external transmission pipeline initial station mainly has the function of carrying out trade measurement on natural gas transmitted to a downstream and is provided with a pipe cleaner ball serving device, a measuring device and a pressure regulating device. It is generally economical and feasible to establish the boundary area of the LNG receiving station at the initial station of the export pipeline or to establish the export pipeline at a position close to the outside of the boundary area of the LNG receiving station, and the control system of the export pipeline is generally independent of the control system of the LNG receiving station. However, the problem caused by the method is that the pressure and control of the LNG receiving station gasification export unit and the export pipeline engineering are difficult to be effectively connected, and even become one of important hidden dangers. The LNG receiving station gasification export process generally comprises three equipment facility units, namely an LNG high-pressure export pump, a gasifier and a gasification export main pipe, the design pressure of the three equipment facility units is the same, namely 1.25 times of the export maximum operation pressure and 1.1 times of the sum of the suction inlet pressure of the LNG high-pressure export pump, often more than 10MPa, but after the three equipment facility units enter an export pipeline initial station boundary area, the design pressure is usually considered according to the export maximum operation pressure plus a margin and is often lower than the design pressure of the LNG receiving station gasification export unit by two pressure levels.
Under the normal outward transportation operation condition, the LNG high-pressure outward transportation pump can not cause the overpressure of the initial station of the outward transportation pipeline within the normal working range. And the LNG receiving station external transmission system has no pressure protection system, so long as the pressure of the downstream external transmission pipeline exceeds the highest operating pressure, the pressure sensor with two out of three will give an alarm, and the output quantity of the LNG receiving station external transmission system can be controlled and adjusted by the downstream pressure signal, so that the overpressure of the external transmission pipeline at the initial station is avoided. However, in the event of an emergency shutdown, if the emergency shutdown valve downstream of the export pipeline head station is closed, and the emergency shutdown valve at the outlet of the vaporizer in the LNG receiving station cannot be closed as quickly as possible due to delay logic or a fault, the export pipeline head station may become overpressured. Because of the special design of the gasifier, the emergency shut-off valve at the outlet is delayed to shut off for about 20-40 s compared with the emergency shut-off valve at the inlet for self pressure protection in case of emergency shut-off. During this time, the LNG gas in the gasifier continues to vaporize, causing the pressure in the gasifier export line to significantly exceed the operating pressure. With 5 vaporizers operating simultaneously, an emergency shutdown will cause the LNG trapped in the ORV export pipeline to expand approximately 600 times in volume, and the resulting boost will be above 2MPa, estimated as a shutdown time delay of 40 s.
The method comprises the following steps that firstly, an emergency shut-off valve for the first station of the external transmission pipeline and an emergency shut-off valve for the outlet of a vaporizer of the LNG receiving station are logically associated, the emergency shut-off valve for the outlet of the vaporizer adopts a quick-closing valve, but the logical association of instruments has the problem of unreliability; secondly, a safety valve and an emptying valve are added between the emergency shut-off valve at the initial station of the external transmission pipeline and the emergency shut-off valve at the outlet of the gasifier, but the processing capacity of a flare system of the LNG receiving station and the investment of a discharge pipeline need to be greatly improved, the equipment investment cost is increased, and in addition, a larger site safety distance is needed; thirdly, the design pressure of the first station of the export pipeline is increased to be consistent with the design pressure of the export system of the LNG receiving station, and the investment is increased greatly. Therefore, the conventional solutions have various disadvantages, such as insufficient safety and reliability, or greatly increased investment.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, the present invention is to provide a high integrity pressure protection system for gasified back export pipeline of LNG receiving station with less investment and high safety and reliability.
In order to achieve the purpose, the utility model adopts the following technical proposal: a high integrity pressure protection system for an export pipeline after LNG receiving station gasification comprises a shut-off valve, a pressure transmitter and a logic processing controller;
the cutoff valve and the pressure transmitter are sequentially arranged on a pipeline between the gasifier output main pipe and the output pipeline initial station;
the logic processing controller is electrically connected with the stop valve and the pressure transmitter, the logic processing controller is right the pressure value detected by the pressure transmitter is logically judged and then controlled, the stop valve is turned off according to the preset pressure alarm value lower than the initial station design pressure of the external transmission pipeline, and the stop valve is used for controlling the continuously increased gas in the external transmission main pipe of the gasifier within the external transmission main pipe range of the gasifier without entering the initial station of the external transmission pipeline.
In some embodiments of the present invention, the shut-off valve is an electric or electromagnetic or pneumatic shut-off valve with its own power source.
In some embodiments of the present invention, the number of the shut-off valves is two, two the shut-off valves are connected in series.
In some embodiments of the present invention, the number of the pressure transmitters is three, three the pressure transmitters are sequentially connected in series.
The utility model discloses an in some embodiments, logic processing controller is right the alarm pressure value that pressure transmitter detected carries out the logic judgement of three selections two, according to detecting the pressure value to two series connection the trip valve sends operating command, starts respectively when reaching the different default values of the highest operating pressure in outer pipeline head station correspondingly the trip valve cuts off in the settlement time.
In some embodiments of the present invention, the logic processing controller is a siemens or mitsubishi programmable logic processing controller, such that the meter safety integrity level is 3 and above.
The utility model discloses owing to take above technical scheme, it has following characteristics:
1. the utility model arranges a high integrity pressure protection system on the LNG receiving station vaporizer external transmission main pipe, cancels the emergency shut-off valve of the conventional vaporizer external transmission main pipe, and does not require the downstream emergency shut-off valve of the external transmission pipeline initial station to be logically interlocked with the emergency shut-off valves of the LNG receiving station vaporizer inlet and outlet, thereby fully ensuring the pressure safety of the external transmission pipeline initial station with rapid reaction speed and high reliability;
2. the utility model discloses a high integrality pressure protection system investment is less, fail safe nature is enough high, effectively solves the pressure protection problem between LNG receiving station gasification back defeated unit and the defeated pipeline head station outward, especially in relevant LNG receiving station design consideration in earlier stage not enough, the operation phase reforms transform the effect that the stage was used most outstanding.
Drawings
Fig. 1 is the utility model discloses a high integrality pressure protection system schematic diagram of defeated pipeline after LNG receiving station gasification.
Detailed Description
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "upper", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.
As shown in fig. 1, the high integrity pressure protection system for the gasified export pipeline of the LNG receiving station provided by the embodiment comprises a shut-off valve, a pressure transmitter and a logic processing controller, wherein the shut-off valve and the pressure transmitter are sequentially arranged on a pipeline between an export main pipe of the gasifier and an export pipeline head station, and the logic processing controller is electrically connected with the shut-off valve and the pressure transmitter.
Specifically, the number of the shut-off valves can be two, and the two shut-off valves a1 and a2 are connected in series, preferably, the shut-off valves can be electric or electromagnetic or pneumatic shut-off valves with a power source;
the number of the pressure transmitters can be three, namely the pressure transmitters B1-B3;
logic process controller C may employ a siemens or mitsubishi programmable logic process controller (e.g., mitsubishi QnU series, etc.) with a control loop such that the meter Safety Integrity Level (SIL) is 3 and above.
In use, an emergency shutdown is initiated based on the condition being addressed, such as an accident occurring downstream of the vaporizer export pipeline, and the emergency shutdown signal is not normally linked to the control system of the LNG receiving station. When the LNG receiving station gasifier export main pipe detects a pressure alarm, because of the particularity of the design of the gasifier, the emergency shut-off valve at the outlet of the gasifier delays to shut off for about 20-40 s compared with the emergency shut-off valve at the inlet of the gasifier for the pressure protection of the gasifier under the emergency shut-off condition. During the period, the LNG gas in the vaporizer is continuously vaporized, the pressure in the external delivery main pipe of the vaporizer is increased, the high integrity pressure protection system of the embodiment detects alarm pressure values by three pressure transmitters B1-B3 arranged at the downstream, and performs two-out-of-three logic judgment by a logic processing controller C (namely, the alarm pressure values detected by the pressure transmitters B1, B2 and B3 are selected respectively, if any two pressure transmitters trigger alarm, namely, the alarm is confirmed, and only one pressure transmitter triggers the alarm, the operation is not performed), so that two series-connected cut-off valves a1 and a2 are triggered to quickly respond according to the preset pressure alarm value lower than the initial station design pressure of the external delivery pipe, and the cut-off is performed, so that the gas continuously increased in the external delivery main pipe of the vaporizer can be controlled within the range of the LNG receiving station vaporization external delivery main pipe and does not enter the initial station boundary area of the external delivery pipe.
As the final stage of protection of the process system, a normally provided pressure relief valve (PSV) may have sufficient relief capacity in a fault state to completely relieve the fluid entering the system, so that the pressure of the process system does not exceed the design conditions, thereby ensuring the safety of the whole process system, but the whole system does not have safety conditions. The high-integrity pressure protection system provided by the embodiment has the functions of effectively cutting off the upstream pressure source in a very short time under a fault state and ensuring that the downstream system is not influenced by the upstream high-pressure source, and has higher response speed and higher reliability than the conventional emergency shut-off valve device.
The following describes in detail, with reference to specific embodiments, a process of performing pressure protection on the high integrity pressure protection system of the outgoing pipeline after the LNG receiving station is gasified, where the process includes:
s1, in case of accident or the like at the downstream of the initial station 1 of the export pipeline, the emergency shut-off valve 2 is activated, and the signal of the emergency shut-off valve 2 is not linked to the control system of the LNG receiving station.
S2, continuously gasifying the LNG in the gasifiers 3 and 4, increasing the pressure in the external conveying main pipe of the gasifier, and detecting alarm pressure values reaching the highest operation pressure of the external conveying initial station by three pressure transmitters B1, B2 and B3 arranged at the downstream of the high integrity pressure protection system 5.
And S3, the logic processing controller C performs logic judgment of two-out-of-three, and sends an operation command to two series-connected shut-off valves A1 and A2 according to the detected pressure signal.
S4, two cut-off valves A1 and A2 which are connected in series are used for quickly responding according to a preset pressure alarm value lower than the design pressure of the first station of the external transmission pipeline, starting the cut-off valve A2 when the maximum operation pressure of the first station of the external transmission pipeline reaches 105%, and cutting off within 2-5 seconds;
s5, when the highest operation pressure of the first output station is 108-110%, starting a cut-off valve A1, and cutting off within 2-5 seconds;
s6, shutting off the emergency shut-off valves 6 and 7 at the upstream of the gasifiers 3 and 4, shutting off the LNG high-pressure pumps 8 and 9, enabling the LNG to flow through the flow control valves 10 and 11 in the pipelines at the downstream of the emergency shut-off valves 6 and 7, entering the gasifiers 3 and 4 to be continuously gasified, further increasing the pressure in the pipelines through the one- way valves 12 and 13, and shutting off the emergency shut-off valves 14 and 15 at the downstream of the gasifiers 3 and 4 after 20-30 seconds.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope thereof, and although the present application is described in detail with reference to the above embodiments, those skilled in the art should understand that: numerous variations, modifications, and equivalents will occur to those skilled in the art upon reading the present application and are within the scope of the claims appended hereto.
Claims (6)
1. A high integrity pressure protection system for an export pipeline after LNG receiving station gasification is characterized by comprising a shut-off valve, a pressure transmitter and a logic processing controller;
the cutoff valve and the pressure transmitter are sequentially arranged on a pipeline between the gasifier output main pipe and the output pipeline initial station;
the logic processing controller is electrically connected with the stop valve and the pressure transmitter, the logic processing controller is right the pressure value detected by the pressure transmitter is logically judged and then controlled, the stop valve is turned off according to the preset pressure alarm value lower than the initial station design pressure of the external transmission pipeline, and the stop valve is used for controlling the continuously increased gas in the external transmission main pipe of the gasifier within the external transmission main pipe range of the gasifier without entering the initial station of the external transmission pipeline.
2. The high integrity pressure protection system of claim 1, wherein the shut-off valve is an electric or electromagnetic or pneumatic shut-off valve with its own power source.
3. The high integrity pressure protection system of claim 2, wherein the number of said shut-off valves is two, two said shut-off valves being connected in series.
4. The high integrity pressure protection system of claim 3, wherein said number of pressure transmitters is three, three of said pressure transmitters being connected in series in sequence.
5. The high integrity pressure protection system of claim 4, wherein the logic processing controller performs a two-out-of-three logic judgment on the alarm pressure value detected by the pressure transmitter, sends an operation instruction to the two series-connected shut-off valves according to the detected pressure value, and respectively starts the corresponding shut-off valves to shut off within a set time when different preset values of the highest operation pressure at the initial station of the export pipeline are reached.
6. The high integrity pressure protection system of any one of claims 1 to 5, wherein the logic process controller is a Siemens or Mitsubishi programmable logic process controller, such that the meter safety integrity level is 3 and above.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922215194.8U CN211551161U (en) | 2019-12-11 | 2019-12-11 | High-integrity pressure protection system for external transmission pipeline after LNG receiving station is gasified |
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| CN201922215194.8U CN211551161U (en) | 2019-12-11 | 2019-12-11 | High-integrity pressure protection system for external transmission pipeline after LNG receiving station is gasified |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113052453A (en) * | 2021-03-22 | 2021-06-29 | 中国石油大学(华东) | Torch load regulation and control method based on HIPPS function |
| CN115200134A (en) * | 2022-02-22 | 2022-10-18 | 中国核电工程有限公司 | Automatic isolation system for pressure boundary of master control chamber |
-
2019
- 2019-12-11 CN CN201922215194.8U patent/CN211551161U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113052453A (en) * | 2021-03-22 | 2021-06-29 | 中国石油大学(华东) | Torch load regulation and control method based on HIPPS function |
| CN115200134A (en) * | 2022-02-22 | 2022-10-18 | 中国核电工程有限公司 | Automatic isolation system for pressure boundary of master control chamber |
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