CN218816908U - Precooling liquid level control device of high-pressure delivery pump - Google Patents
Precooling liquid level control device of high-pressure delivery pump Download PDFInfo
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- CN218816908U CN218816908U CN202223294158.3U CN202223294158U CN218816908U CN 218816908 U CN218816908 U CN 218816908U CN 202223294158 U CN202223294158 U CN 202223294158U CN 218816908 U CN218816908 U CN 218816908U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The utility model provides a high pressure delivery pump precooling liquid level control device relates to the LNG delivery pump field. The high-pressure conveying pump comprises a pump barrel and a pump main body, wherein an inlet of the pump barrel is communicated with a LNG conveying pipeline I, an outlet of the pump main body is communicated with a LNG conveying pipeline II, the LNG conveying pipeline I is provided with a first pressure gauge, and the LNG conveying pipeline II is provided with a second pressure gauge; the LNG conveying pipeline I is communicated with a precooling pipeline; the pump barrel is communicated with a first pressure relief pipeline, the LNG conveying pipeline two is communicated with a second pressure relief pipeline, the first pressure relief pipeline is communicated with a third pressure relief pipeline, the third pressure relief pipeline is communicated with the second pressure relief pipeline, and the third pressure relief pipeline is communicated with a fourth pressure relief pipeline. The utility model discloses at the high-pressure pump at the precooling in-process, pressure is kept balanced all the time inside and outside pump barrel and the pump main part, effectively prevents to lead to the inside and outside liquid level difference of the pump body because of pressure imbalance, causes the high-pressure pump precooling inhomogeneous, forms stress, and the phenomenon of damaging equipment appears.
Description
Technical Field
The utility model relates to a LNG delivery pump technical field particularly, relates to a high-pressure delivery pump precooling liquid level control device.
Background
The rapid increase of national economy leads the demand of China for energy to be continuously increased, LNG is a clean and efficient energy and has become the target of key development and utilization in the early century of China, a high-pressure delivery pump is important supercharging equipment for high-pressure pipe delivery of natural gas by an LNG receiving station, the supercharged LNG enters a gasifier for gasification, and the installation mode of the LNG is mainly vertical installation and is divided into underground installation and overground installation, which has advantages and disadvantages.
The high-pressure delivery pump generally used by the LNG receiving station is an immersed motor-driven centrifugal cryogenic pump with a liquid absorption container. Pre-cooling of the high pressure transfer pump prior to initial operation and commissioning after service is very important. The high-pressure delivery pump is fully cooled before entering the low-temperature liquid formally, namely, precooling is carried out. The suction inlet tank of the pump is made of austenitic stainless steel material. The main materials of the pump body are aluminum alloy and austenitic stainless steel. Aluminum and austenitic stainless steel have relatively high coefficients of expansion and very low thermal conductivity at very low temperatures. In order to prevent the problems of material or connecting parts from being damaged due to too fast temperature change and too large thermal stress, a pre-cooling operation is required to be carried out before the pump enters the low-temperature liquid, and the temperature change rate is ensured not to be too large so as to ensure the safe operation.
The high-pressure delivery pump mainly comprises a pump barrel and a pump main body which are mutually communicated, when the liquid level of the pump barrel is higher than a pump suction inlet in the precooling process of the high-pressure delivery pump, the inside and the outside of the pump main body are isolated, and when the pressure of the pump barrel is too high and needs to be relieved, a liquid level difference is formed inside and outside the pump main body due to pressure difference, so that precooling is uneven, and stress is generated to damage equipment.
In summary, we propose a pre-cooling liquid level control device for a high-pressure delivery pump to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a high pressure delivery pump precooling liquid level control device, the internal and external pressure of pump barrel and pump main part remain balance throughout, prevent effectively that the pump body is inside and outside to form the liquid level difference because of the pressure imbalance, cause the high-pressure pump precooling inhomogeneous, form stress, the phenomenon of damage equipment appears.
The embodiment of the utility model is realized like this:
the embodiment of the application provides a precooling liquid level control device for a high-pressure delivery pump, wherein the high-pressure delivery pump comprises a pump barrel and a pump main body which are matched with each other, the pump barrel is provided with a liquid inlet, the pump main body is provided with an inlet and an outlet, the inlet of the pump main body is positioned in an inner cavity of the pump barrel, the inlet of the pump barrel is communicated with a first LNG delivery pipeline, the outlet of the pump main body is communicated with a second LNG delivery pipeline, the first LNG delivery pipeline is provided with a first pressure gauge, and the second LNG delivery pipeline is provided with a second pressure gauge;
the LNG conveying pipeline I is communicated with a precooling pipeline, and one end, far away from the LNG conveying pipeline I, of the precooling pipeline is communicated with the inner cavity of the pump cylinder;
the pump cylinder is communicated with a first pressure relief pipeline, the LNG conveying pipeline two is communicated with a second pressure relief pipeline, the first pressure relief pipeline is communicated with a third pressure relief pipeline, one end, far away from the first pressure relief pipeline, of the third pressure relief pipeline is communicated with the second pressure relief pipeline, and the third pressure relief pipeline is communicated with a fourth pressure relief pipeline.
In some embodiments of the present invention, the first pressure relief pipeline is provided with a PSV valve, and an outlet end of the PSV valve is communicated with the BOG manifold;
the second pressure relief pipeline is provided with a TSV valve, and the outlet end of the TSV valve is communicated with another BOG manifold;
the two ports of the third pressure relief line are located at the inlet ends of the PSV valve and the TSV valve, respectively.
In some embodiments of the present invention, the open end of the fourth pressure relief pipeline is communicated with the BOG manifold of the PSV valve, and the fourth pressure relief pipeline is sequentially provided with a valve four and a valve seven;
the precooling pipeline is sequentially provided with a first valve and a second valve, the third pressure relief pipeline is provided with a fifth valve and a sixth valve, and the fourth pressure relief pipeline is arranged between the fifth valve and the sixth valve.
In some embodiments of the present invention, the first LNG transfer pipeline is provided with a third valve, and the first pressure gauge is disposed at an outlet side of the third valve;
the second LNG transfer line is provided with a valve eighth, and the valve eighth is disposed downstream of the inlet side of the second pressure relief line.
In some embodiments of the present invention, the first pressure relief pipeline and the second pressure relief pipeline are both low-temperature stainless steel pipelines.
In some embodiments of the present invention, the second pressure gauge is disposed on the LNG transfer line between the second pressure relief line and the pump body.
Compared with the prior art, the embodiment of the utility model has following advantage or beneficial effect at least:
when the high-pressure delivery pump precools, the LNG delivery pipeline I at the outlet side of the precooling pipeline and the LNG delivery pipeline II at the outlet side of the second pressure relief pipeline are both in a closed state, and the fourth pressure relief pipeline is in a closed state, so that LNG flows into the pump barrel to be precooled; when the pressure of the pump barrel is overlarge, the precooling pipeline is in a closed state, the fourth pressure relief pipeline is in an open state, the third pressure relief pipeline is communicated with the interior of the pump barrel and the interior of the pump main body through the first pressure relief pipeline and the second pressure relief pipeline, so that the pressure of the pump barrel and the pressure of the pump main body reach a balanced state, and finally the pump barrel and the pump main body are discharged through the fourth pressure relief pipeline. The internal and external pressures of the pump barrel and the pump body are always kept balanced, so that the phenomenon that the precooling of the high-pressure pump is not uniform, stress is formed and equipment is damaged due to the fact that a liquid level difference is formed inside and outside the pump body caused by the unbalanced pressure is effectively prevented.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a flow chart of a precooling liquid level control device for a high-pressure delivery pump according to an embodiment of the invention;
fig. 2 is a diagram illustrating a standard diagram for performing precooling according to an embodiment of the present invention.
An icon: the LNG pressure relief device comprises a first LNG conveying pipeline, a second LNG conveying pipeline, a 3 precooling pipeline, a 4 first pressure relief pipeline, a 5 second pressure relief pipeline, a 6 third pressure relief pipeline, a 7 fourth pressure relief pipeline, 8 pump cylinders and a 9 pump main body.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, the description is only for convenience of description of the present invention and simplification, but the indication or suggestion that the device or element to be referred must have a specific position, be constructed and operated in a specific position, and therefore, the present invention should not be construed as being limited thereto. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not require that the components be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, "a plurality" means at least 2.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "set", "mounted", "connected" and "connected" should be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; 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 according to specific situations by those skilled in the art.
Examples
Referring to fig. 1, the embodiment provides a precooling liquid level control device for a high-pressure delivery pump, where the high-pressure delivery pump includes a pump cylinder 8 and a pump main body 9 that are matched with each other, the pump cylinder 8 has a liquid inlet, the pump main body 9 has an inlet and an outlet, the inlet of the pump main body 9 is located in an inner cavity of the pump cylinder 8, the inlet of the pump cylinder 8 is communicated with an LNG delivery pipeline one 1, the outlet of the pump main body 9 is communicated with an LNG delivery pipeline two 2, the delivery pipeline one is provided with a first pressure gauge, and the LNG delivery pipeline two 2 is provided with a second pressure gauge;
the LNG conveying pipeline I1 is communicated with a pre-cooling pipeline 3, and one end, far away from the LNG conveying pipeline I1, of the pre-cooling pipeline 3 is communicated with the inner cavity of the pump cylinder 8;
the pump cylinder 8 is communicated with a first pressure relief line 4, the LNG transfer line 2 is communicated with a second pressure relief line 5, the first pressure relief line 4 is communicated with a third pressure relief line 6, one end of the third pressure relief line 6, which is far from the first pressure relief line 4, is communicated with the second pressure relief line 5, and the third pressure relief line 6 is communicated with a fourth pressure relief line 7.
When the high-pressure delivery pump is used for precooling, the LNG delivery pipeline I1 on the outlet side of the precooling pipeline 3 and the LNG delivery pipeline II 2 on the outlet side of the second pressure relief pipeline 5 are both in a closed state, and the fourth pressure relief pipeline 7 is in a closed state, so that LNG flows into the pump barrel 8 for precooling; when the pressure of the pump barrel 8 is too high, the pre-cooling pipeline 3 is in a closed state, the fourth pressure relief pipeline 7 is in an open state, the third pressure relief pipeline 6 is communicated with the interior of the pump barrel 8 and the interior of the pump main body 9 through the first pressure relief pipeline 4 and the second pressure relief pipeline 5, the pump barrel 8 and the pump main body 9 are in a pressure balance state, and finally the pump barrel is discharged through the fourth pressure relief pipeline 7. The internal and external pressures of the pump barrel 8 and the pump main body 9 are always kept balanced, so that the phenomenon that the precooling of the high-pressure pump is not uniform, stress is formed and equipment is damaged due to the fact that a liquid level difference is formed inside and outside the pump body caused by the unbalanced pressure is effectively prevented.
In some embodiments of the present invention, the first pressure relief pipeline 4 is provided with a PSV valve, and an outlet end of the PSV valve is communicated with the BOG manifold;
the second pressure relief pipeline 5 is provided with a TSV valve, and the outlet end of the TSV valve is communicated with another BOG manifold;
the two ports of the third pressure relief line 6 are located at the inlet ends of the PSV valve and the TSV valve, respectively.
In the above embodiments, the PSV valve, i.e., the pressure relief valve, plays a role of safety protection. When the system pressure exceeds the specified value, the safety valve is opened, and a part of gas in the system is discharged into the BOG manifold, so that the system pressure does not exceed the allowable value, and the system is ensured not to have accidents due to overhigh pressure. The inlet of the PSV valve is communicated with a first pressure relief pipeline 4, and the outlet of the PSV valve is communicated with a BOG manifold.
The inlet of the TSV valve is communicated with the second pressure relief pipeline 5, the outlet of the TSV valve is communicated with the other BOG manifold, and the PSV valve and the TSV valve are in a normally closed state when the high-pressure pump precools.
In some embodiments of the present invention, the open end of the fourth pressure relief pipeline 7 is communicated with the BOG manifold of the PSV valve, and the fourth pressure relief pipeline 7 is sequentially provided with a valve four and a valve seven;
the first valve and the second valve are sequentially arranged on the precooling pipeline 3, the fifth valve and the sixth valve are arranged on the third pressure relief pipeline 6, and the fourth pressure relief pipeline 7 is arranged between the fifth valve and the sixth valve.
In the above embodiment, the first valve is disposed in front of the second valve, the fourth valve is disposed in front of the seventh valve, the fifth valve is disposed close to the TSV valve, and the sixth valve is disposed close to the PSV valve.
In some embodiments of the present invention, the LNG transfer pipeline 1 is provided with a third valve, and the first pressure gauge is disposed at an outlet side of the third valve;
the LNG transfer line 2 is provided with a valve eighth, and the valve eighth is provided downstream of the inlet side of the second pressure relief line 5.
In the above embodiment, the third valve is located downstream of the port of the pre-cooling pipeline 3, the first pressure gauge is arranged between the third valve and the inlet of the pump barrel 8, the first pressure gauge is used for detecting the pressure inside the pump barrel 8, and the third valve enables the LNG transfer pipeline 1 and the inlet of the pump barrel 8 to be in an open-circuit state; and closing the eighth valve, so that the second LNG conveying pipeline 2 is in an open circuit state, and precooling of the high-pressure conveying pump is facilitated.
In some embodiments of the present invention, the first pressure relief pipeline 4 and the second pressure relief pipeline 5 are low-temperature stainless steel pipelines.
In the above embodiments, it should be noted that the first pressure relief line 4 and the second pressure relief line 5 are made of low-temperature stainless steel pipes, which are only one embodiment of the present invention, and the structure of the first pressure relief line 4 and the second pressure relief line 5 is not limited, and in other embodiments, other pipes may be used.
In some embodiments of the present invention, the second pressure gauge is disposed on the LNG transfer line 2 between the second pressure relief line 5 and the pump main body 9.
In the above embodiment, the second pressure gauge is used to detect the pressure inside the pump main body 9.
Referring to fig. 1 and 2, a method for pre-cooling a liquid level control device based on a high-pressure delivery pump includes the following steps:
s1, a PSV valve and a TSV valve are in a normally closed state, a valve IV, a valve III of an LNG conveying pipeline I1 and a valve IV on an LNG conveying pipeline II 2 are in a closed state, and a TSV valve inlet side valve V, a PSV inlet side valve VI and a PSV outlet side valve VII are opened;
s2, opening the first valve, and then slowly opening the second valve to enable LNG to enter the pump cylinder 8 for precooling;
and S3, acquiring numerical values of the first pressure gauge and the second pressure gauge during precooling, temporarily stopping precooling if P1/P2 is greater than 400KPB, closing the second valve, simultaneously opening the fourth valve, allowing the LNG to flow to a BOG header communicated with the PSV valve through a fourth pressure relief pipeline 7, and executing S2 if P1/P2 is less than 400 KPB.
Referring to fig. 2, in some embodiments of the present invention, the pre-cooling execution criterion in step S2 is that when the liquid level of the pump barrel 8 is 457mm to 4572mm, the pre-cooling time is 30min or 60min.
In some embodiments of the present invention, in step S2, the liquid level of the pump barrel 8 reaches 4572mm, and when the liquid level is stable, V2 is closed, and the precooling is completed.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. 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 (6)
1. A precooling liquid level control device of a high-pressure delivery pump is applied to the high-pressure delivery pump and is characterized in that the high-pressure delivery pump comprises a pump cylinder and a pump main body which are matched with each other, the pump cylinder is provided with a liquid inlet, the pump main body is provided with an inlet and an outlet, the inlet of the pump main body is positioned in an inner cavity of the pump cylinder, the inlet of the pump cylinder is communicated with a LNG delivery pipeline I, the outlet of the pump main body is communicated with a LNG delivery pipeline II, the LNG delivery pipeline I is provided with a first pressure gauge, and the LNG delivery pipeline II is provided with a second pressure gauge;
the first LNG conveying pipeline is communicated with a precooling pipeline, and one end, far away from the first LNG conveying pipeline, of the precooling pipeline is communicated with the inner cavity of the pump barrel;
the pump barrel is communicated with a first pressure relief pipeline, the LNG conveying pipeline two is communicated with a second pressure relief pipeline, the first pressure relief pipeline is communicated with a third pressure relief pipeline, one end, far away from the first pressure relief pipeline, of the third pressure relief pipeline is communicated with the second pressure relief pipeline, and the third pressure relief pipeline is communicated with a fourth pressure relief pipeline.
2. The pre-cooling liquid level control device for the high-pressure delivery pump according to claim 1, wherein the first pressure relief pipeline is provided with a PSV valve, and an outlet end of the PSV valve is communicated with a BOG manifold;
the second pressure relief pipeline is provided with a TSV valve, and the outlet end of the TSV valve is communicated with the other BOG manifold;
and two ports of the third pressure relief pipeline are respectively positioned at the inlet ends of the PSV valve and the TSV valve.
3. The pre-cooling liquid level control device for the high-pressure delivery pump according to claim 2, wherein an open end of the fourth pressure relief pipeline is communicated with a BOG manifold of the PSV valve, and the fourth pressure relief pipeline is provided with a valve IV and a valve VII in sequence;
the precooling pipeline is sequentially provided with a first valve and a second valve, the third pressure relief pipeline is provided with a fifth valve and a sixth valve, and the fourth pressure relief pipeline is arranged between the fifth valve and the sixth valve.
4. The pre-cooling liquid level control device for the high-pressure delivery pump according to claim 3, wherein a valve III is arranged on the first LNG delivery pipeline, and the first pressure gauge is arranged on an outlet side of the valve III;
and the LNG conveying pipeline II is provided with an eighth valve, and the eighth valve is arranged at the downstream of the inlet side of the second pressure relief pipeline.
5. The pre-cooling liquid level control device for the high-pressure delivery pump according to claim 1, wherein the first pressure relief pipeline and the second pressure relief pipeline are both low-temperature stainless steel pipelines.
6. The pre-cooling liquid level control device for the high-pressure delivery pump according to claim 4, wherein the second pressure gauge is disposed on the second LNG delivery line between the second pressure relief line and the pump body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223294158.3U CN218816908U (en) | 2022-12-08 | 2022-12-08 | Precooling liquid level control device of high-pressure delivery pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223294158.3U CN218816908U (en) | 2022-12-08 | 2022-12-08 | Precooling liquid level control device of high-pressure delivery pump |
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| Publication Number | Publication Date |
|---|---|
| CN218816908U true CN218816908U (en) | 2023-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223294158.3U Active CN218816908U (en) | 2022-12-08 | 2022-12-08 | Precooling liquid level control device of high-pressure delivery pump |
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| CN (1) | CN218816908U (en) |
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- 2022-12-08 CN CN202223294158.3U patent/CN218816908U/en active Active
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