CN211118749U - L NG vacuum storage tank pressure and liquid level system - Google Patents
L NG vacuum storage tank pressure and liquid level system Download PDFInfo
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- CN211118749U CN211118749U CN201921232558.7U CN201921232558U CN211118749U CN 211118749 U CN211118749 U CN 211118749U CN 201921232558 U CN201921232558 U CN 201921232558U CN 211118749 U CN211118749 U CN 211118749U
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Abstract
The utility model provides an L NG vacuum storage tank pressure, liquid level system, which comprises a tank body, a liquid level meter gas phase pipe, a liquid level meter liquid phase pipe, a gas phase pipe, a sight glass liquid collector and a sight glass liquid collector, wherein one end of the liquid level meter gas phase pipe is connected with the top of the tank body, the other end of the liquid level meter gas phase pipe is connected with a balance valve of the liquid level meter, one end of the liquid level meter liquid phase pipe is connected with the bottom of the tank body, the other end of the liquid level meter liquid phase pipe is connected with the balance valve of the liquid level meter, one end of the gas phase pipe is connected with the top of the tank body, the other end of the gas phase pipe is externally connected with a torch removing pipeline, the sight glass liquid collector is arranged on the liquid level meter gas phase pipe, and the bottom end.
Description
Technical Field
The utility model relates to an L NG vacuum storage tank pressure, liquid level system field, concretely relates to L NG vacuum storage tank pressure, liquid level system.
Background
At present, L NG is the abbreviation of liquefied natural gas (liquefied natural gas). L NG vacuum storage tank pressure and liquid level system, the main component of the natural gas is alkane, most of which is methane, but also contains a small amount of petroleum gas, such as propane, etc. the small amount of petroleum gas is gradually compressed and liquefied along with the change of the storage tank pressure in a gas phase pipe of a liquid level meter, is gathered at the bottom of the gas phase pipe to form a liquid column, and liquid column static pressure is generated, so that the actually measured pressure of the gas phase pipe is higher, and the storage tank pressure and liquid level measurement are influenced.
Chinese utility model patent publication No. CN 241917 discloses a liquefied natural gas transportation storage tank, which mainly comprises a shell, an inner container, a heat insulation structure, a radial support, an axial support, and a rigid assembly, wherein the inner container is connected with the shell through the radial support and the axial support combined support, an interlayer between the inner container and the shell is a high vacuum chamber, a high vacuum multi-layer heat insulation layer is wound outside the inner container, and a low temperature and normal temperature getter is arranged, and the rigid assembly is connected with a rear support inner container support steel pipe through a gland nut of a heat insulation cushion block. A small amount of petroleum gas is gradually compressed and liquefied along with the change of the pressure of the storage tank in a gas phase pipe of the liquid level meter, and is gathered at the bottommost part of the gas phase pipe to form a liquid column, so that liquid column static pressure is generated, the actually measured pressure of the gas phase pipe is higher, and the pressure and liquid level measurement of the storage tank are influenced; in order to solve the problems, the air can only be directly discharged to the atmosphere without an emptying pipe, and a storage tank is generally positioned in an explosion-proof area, so that potential safety hazards exist; when an emptying pipe is arranged, in order to protect the liquid level meter in the emptying process, a balance valve of the liquid level meter needs to be closed, so that the pressure of a storage tank and the liquid level detection are discontinuous, and the potential safety hazard also exists.
Disclosure of Invention
An object of the utility model is to provide an L NG vacuum storage tank pressure, liquid level system, through L NG vacuum storage tank pressure, liquid level system, there is the potential safety hazard defect in its unloading operation of having solved current L NG vacuum storage tank pressure, liquid level system.
In order to achieve the above object, the utility model adopts the following technical scheme:
the utility model provides an L NG vacuum storage tank pressure and liquid level system, which comprises a tank body;
one end of the liquid level meter gas phase pipe is connected with the top of the tank body, and the other end of the liquid level meter gas phase pipe is connected with a liquid level meter balance valve; one end of the liquid phase pipe of the liquid level meter is connected with the bottom of the tank body, and the other end of the liquid phase pipe of the liquid level meter is connected with a balance valve of the liquid level meter; a gas phase pipe; one end of the gas phase pipe is connected with the top of the tank body, and the other end of the gas phase pipe is externally connected with a torch pipeline; the sight glass liquid collector is arranged on the gas phase pipe of the liquid level meter; the bottom end of the sight glass liquid collector is externally connected with a torch pipeline.
When the liquid collector is not installed, the gas phase pipe of the liquid level meter has accumulated liquid, the pressure of the gas phase space at the top of the storage tank is P1, the pressure generated by the accumulated liquid in the gas phase pipe is P2, the static pressure of the liquid column in the storage tank is P3, the pressure gauge measures P1+ P2, the pressure difference measured by the liquid level meter measures L G (P1+ P3) - (P1+ P2) P3-P2 after the liquid collector is installed, the pressure difference measured by the pressure gauge measures L G (P1+ P3-P1) after the liquid collector is installed, the pressure reading of the pressure gauge is larger when the liquid collector is not installed, the pressure reading of the pressure gauge is smaller when the liquid collector is installed, after the liquid collector is emptied, liquefied petroleum gas is liquefied along the gas phase pipe under the action of gravity, the liquid level in the gas phase pipe is close to the liquid level in the liquid collector, and the liquid level is not accurately observed by a liquid level sight glass.
Optionally, a liquid collector inlet valve is arranged on a liquid level meter gas phase pipe positioned at the front end of the sight glass liquid collector; and a liquid collector outlet valve is arranged on a liquid level meter gas phase pipe positioned at the front end of the sight glass liquid collector.
Optionally, a liquid collecting bypass pipeline is further installed on the outer side of the sight glass liquid collector, one end of the liquid collecting bypass pipeline is connected with a liquid level meter gas phase pipe located at the front end of an inlet valve of the liquid collector, and the other end of the liquid collecting bypass pipeline is connected with a liquid level meter gas phase pipe located at the rear end of an outlet valve of the liquid collector; and the liquid collecting bypass pipeline is provided with a liquid collecting bypass valve. The utility model discloses set up a collection liquid bypass pipeline for when the liquid trap is empty, open a collection liquid bypass pipeline, in order to guarantee that manometer, level gauge normally work.
Optionally, a pipeline of a gas phase pipe of the liquid level meter positioned at the rear end of the liquid collector inlet valve forms an included angle of 5-40 degrees with the horizontal line; and/or the pipeline of a gas phase pipe of the liquid level meter positioned at the rear end of the outlet valve of the liquid collector forms an included angle of 5-40 degrees with the horizontal line. The included angle between the inlet and outlet pipelines of the liquid device and the horizontal line is about 5 to 40 degrees, so that the liquidity of the liquid on the horizontal pipe can be increased.
Optionally, the tank body comprises an inner container and an outer container, the inner container is arranged inside the outer container, and the gas phase pipe of the liquid level meter are connected with the top of the inner container.
Optionally, the sight glass liquid collector is externally connected with a torch pipeline through a liquid collector vent pipe, and a liquid collector vent valve is mounted on the liquid collector vent pipe.
Optionally, the L NG vacuum storage tank pressure and liquid level system further comprises a measuring tube, one end of the measuring tube is connected with a liquid level meter balance valve, the other end of the measuring tube is connected with a liquid level meter gas phase tube, and a liquid level meter and a pressure meter are mounted on the measuring tube.
Optionally, the bottom end of the mirror liquid trap is lower than the lowermost end of the inner container. The utility model discloses set up the bottom that sight glass liquid trap is less than the inner container.
Optionally, the L NG vacuum storage tank pressure and liquid level system further comprises a safety pipeline, the gas phase pipe is switched to a flare pipeline through a control valve, the safety pipeline comprises a main pipeline, a pair of branch pipelines and a side stream pipeline, the pair of branch pipelines are connected with the main pipeline, the branch pipelines are connected with the side stream pipeline, and safety valves are arranged on the branch pipelines.
Optionally, the liquid phase pipe of the liquid level meter comprises an N-shaped liquid seal protection pipe located at the front end of the pipeline. The utility model discloses a prevent that liquid from the liquid phase pipe from incessantly cutting off, influence storage tank pressure after externally gasifying.
Compared with the prior art, the beneficial effects of the utility model reside in that:
1. the pressure and the liquid level are accurately measured, and the measurement cannot be influenced by liquid accumulation in a gas phase pipe of the liquid level meter;
2. the operation method is simple and convenient, and the structure is safe and reliable;
3. in an explosion-proof area, flammable and explosive gases are intensively combusted without potential safety hazards;
4. when the liquid collector is emptied, continuous measurement of pressure and liquid level can be realized;
5. the condition of liquid accumulation in a gas phase pipe of the liquid level meter can be observed through a glass sight glass at any time, and the emptying time is selected.
6. The pressure of the gas phase pipe of the liquid level meter is ensured to be the same as that of the gas phase space of the storage tank, so that the pressure of the gas phase pipe of the liquid level meter is prevented from being reduced when the liquid level meter is emptied, and the gas phase and liquid phase differential pressure of the liquid level meter exceeds the measuring range of the liquid level meter to damage the liquid level meter.
Drawings
FIG. 1 is a schematic flow diagram of an L NG vacuum sump pressure, level system of example 1 of the present invention;
FIG. 2 is a schematic view of the liquid trap structure of the glass sight glass liquid level system of the L NG vacuum reservoir pressure of example 1 of the present invention;
fig. 3 is a schematic structural view of the whole of embodiment 1 of the present invention.
1. An outer container; 2. a gas phase pipe; 3. an inner container; 4. a safety valve; 5. removing a flare pipeline; 6. a liquid level meter gas phase pipe; 7. a pressure gauge; 8. a liquid level meter; 9. a liquid level meter balance valve; 10. a liquid phase pipe of the liquid level meter; 11. A liquid trap bypass valve; 12. a liquid trap inlet valve; 13. a glass mirror liquid trap; 14. a liquid collector blow-down valve; 15. a liquid trap outlet valve; 16. liquid seal protection tubes; 17. a measurement tube; 19. a safety line; 20. a main pipeline; 21. distributing pipelines; 22. a side stream line; 23. a liquid collection bypass line; 100. and (5) a tank body.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described in detail through the accompanying drawings and embodiments. It should be understood, however, that the description herein of specific embodiments is only intended to illustrate the invention and not to limit the scope of the invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
In the description of the present invention, it should be noted that, for the orientation words, such as the terms "upper", "lower", "left", "right", "axial", "radial", "vertical", etc., indicating the orientation and positional relationship based on the orientation and positional relationship shown in the drawings, is only for convenience of description and simplification of the description, but not for indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific scope of the present invention.
Furthermore, if the terms "first" and "second" are used for descriptive purposes only, they are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, the definition of "a first" or "a second" feature may explicitly or implicitly include one or more of the features, and in the description of the invention, "a plurality" means two or more unless specifically defined otherwise.
Unless otherwise expressly stated or limited, the terms "assembled", "connected" and "connected" are used broadly and are intended to be inclusive, e.g., fixed, detachable, or integral; or may be a mechanical connection; the two elements can be directly connected or connected through an intermediate medium, and the two elements can be communicated with each other. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
Example 1
As shown in figures 1, 2 and 3, the utility model provides an L NG vacuum storage tank pressure, liquid level system, including jar body 100, level gauge gas phase pipe 6, level gauge liquid phase pipe 10, gas phase pipe 2 and sight glass liquid trap 13, the jar body includes inner container 3 and outer container 1, the inner container is installed inside the outer container, sight glass liquid trap bottom is less than the bottommost end of inner container, level gauge gas phase pipe one end is connected with jar body top, the other end is connected with level gauge balanced valve 9, level gauge liquid phase pipe one end is connected jar body bottom, the other end is connected with level gauge balanced valve, gas phase pipe one end is connected jar body top, the other end is external to go out the torch pipeline, level gauge gas phase pipe and level gauge liquid phase pipe all connect the top of inner container, the level gauge liquid phase pipe includes the N style of calligraphy liquid seal protection pipe 16 that is located the pipeline front end, L NG vacuum storage tank pressure, liquid level system still includes survey buret 17, a buret one end is connected with level gauge balanced valve, the other end is through connecting level gauge gas phase pipe, survey buret 8 and.
The sight glass liquid collector is arranged on a gas phase pipe of the liquid level meter; the bottom end of the sight glass liquid collector is externally connected with a torch pipeline 5. A liquid collecting bypass pipeline 23 is further arranged on the outer side of the sight glass liquid collector, one end of the liquid collecting bypass pipeline is connected with a liquid level meter gas phase pipe located at the front end of an inlet valve of the liquid collector, and the other end of the liquid collecting bypass pipeline is connected with a liquid level meter gas phase pipe located at the rear end of an outlet valve of the liquid collector; and a liquid collecting bypass valve 11 is arranged on the liquid collecting bypass pipeline. A liquid collector inlet valve 12 is arranged on a liquid level meter gas phase pipe positioned at the front end of the sight glass liquid collector; and a liquid collector outlet valve 15 is arranged on a liquid level meter gas phase pipe positioned at the front end of the sight glass liquid collector. A pipeline of a gas phase pipe of the liquid level meter positioned at the rear end of the liquid collector inlet valve forms an included angle a of 5 degrees with the horizontal line; and a pipeline of a gas phase pipe of the liquid level meter positioned at the rear end of the outlet valve of the liquid collector forms an included angle a of 5 degrees with the horizontal line. The sight glass liquid collector is externally connected with a torch pipeline through a liquid collector emptying pipe, and a liquid collector emptying valve 14 is installed on the liquid collector emptying pipe.
The L NG vacuum storage tank pressure and liquid level system further comprises a safety pipeline 19, the gas phase pipe is connected with a torch pipeline in a switching mode through a control valve, the safety pipeline comprises a main pipeline 20, a pair of branch pipelines 21 and a side stream pipeline 22, the branch pipelines are connected with the main pipeline, the side stream pipelines are connected with the branch pipelines, and safety valves 4 are arranged on the branch pipelines.
When this embodiment is implemented, install the liquid trap additional after, along with the time lapse, by the liquefied petroleum gas, in the sight glass liquid trap is flowed along the level gauge gaseous phase pipe wall to the effect of gravity. The height of the liquid level in the sight glass liquid collector can be observed through a glass sight glass arranged on the liquid collector, and when the liquid level is close to the height of the inlet and the outlet, the emptying operation can be carried out according to steps. The emptied liquid is gasified at normal temperature and normal pressure and then directly sent to a torch for combustion. The specific operation sequence is that a bypass valve of the liquid collector is opened, an inlet valve and an outlet valve of the liquid collector are closed, and a drain valve of the liquid collector is opened; the operation sequence after the liquid is discharged is to close the emptying valve of the liquid collector, open the inlet valve and the outlet valve of the liquid collector and close the bypass valve of the liquid collector.
Example 2
The utility model provides an L NG vacuum storage tank pressure, liquid level system, including jar body, level gauge gas phase pipe, level gauge liquid phase pipe, gas phase pipe and sight glass liquid trap, tank body top is connected to level gauge gas phase pipe one end, and the level gauge balanced valve is connected to the other end, tank body bottom is connected to level gauge liquid phase pipe one end, and the level gauge balanced valve is connected to the other end, tank body top is connected to gas phase pipe one end, the other end external torch line that goes, sight glass liquid trap is installed on the level gauge gas phase pipe, torch line is gone to sight glass liquid trap bottom external torch line.
A liquid collector inlet valve is arranged on a liquid level meter gas phase pipe positioned at the front end of the sight glass liquid collector; and a liquid collector outlet valve is arranged on a liquid level meter gas phase pipe positioned at the front end of the sight glass liquid collector. The pipeline of the gas phase pipe of the liquid level meter positioned at the rear end of the liquid collector inlet valve forms an included angle of 40 degrees with the horizontal line; and a pipeline of a gas phase pipe of the liquid level meter positioned at the rear end of the outlet valve of the liquid collector forms an included angle of 40 degrees with the horizontal line.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the present invention.
Claims (10)
1. An L NG vacuum sump pressure, level system, comprising:
a tank body;
one end of the liquid level meter gas phase pipe is connected with the top of the tank body, and the other end of the liquid level meter gas phase pipe is connected with a liquid level meter balance valve;
one end of the liquid phase pipe of the liquid level meter is connected with the bottom of the tank body, and the other end of the liquid phase pipe of the liquid level meter is connected with a balance valve of the liquid level meter;
a gas phase pipe; one end of the gas phase pipe is connected with the top of the tank body, and the other end of the gas phase pipe is externally connected with a torch pipeline; and
the sight glass liquid collector is arranged on a gas phase pipe of the liquid level meter; the bottom end of the sight glass liquid collector is externally connected with a torch pipeline.
2. The L NG vacuum sump pressure, liquid level system of claim 1, wherein a liquid trap inlet valve is attached to the gauge gas line at the front end of the sight glass liquid trap and a liquid trap outlet valve is attached to the gauge gas line at the front end of the sight glass liquid trap.
3. The L NG vacuum storage tank pressure and liquid level system of claim 2, wherein a liquid collection bypass line is further installed outside the sight glass liquid trap, one end of the liquid collection bypass line is connected to a liquid level gauge gas phase pipe located at the front end of the liquid trap inlet valve, the other end of the liquid collection bypass line is connected to a liquid level gauge gas phase pipe located at the rear end of the liquid trap outlet valve, and a liquid collection bypass valve is installed on the liquid collection bypass line.
4. The L NG vacuum sump pressure, level system of claim 2, wherein a line of the level gauge gas line located at a rear end of the liquid trap inlet valve forms an angle of 5-40 ° with a horizontal line and/or a line of the level gauge gas line located at a rear end of the liquid trap outlet valve forms an angle of 5-40 ° with a horizontal line.
5. The L NG vacuum sump pressure, level system of claim 1, 2 or 3, wherein the canister body comprises an inner container and an outer container, the inner container mounted inside the outer container, the level gauge gas tube and gas tube both connected to a top of the inner container.
6. The L NG vacuum sump pressure, liquid level system of claim 1, wherein the sight glass liquid trap is circumscribed by a liquid trap vent by a flare line, the liquid trap vent being fitted with a liquid trap vent valve.
7. The L NG vacuum sump pressure and level system of claim 1, further comprising a measurement tube having a level gauge balanced valve attached to one end and a level gauge gas line attached to the other end, the measurement tube having a level gauge and a pressure gauge attached thereto.
8. The L NG vacuum sump pressure, level system of claim 1, wherein the sight glass liquid trap bottom end is lower than a lowermost end of the inner container.
9. The L NG vacuum sump pressure, liquid level system of claim 1, 2 or 3, further comprising safety lines, the gas phase line being switched to a flare line by a control valve, the safety lines including a main line, a pair of branch lines each connecting the main line, and a side stream line, the branch lines each connecting the side stream line, the branch lines each having a safety valve mounted thereon.
10. The L NG vacuum sump pressure, liquid level system of claim 1, wherein the gauge liquid phase tube comprises an N-shaped liquid seal protection tube at a front end of the tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921232558.7U CN211118749U (en) | 2019-08-01 | 2019-08-01 | L NG vacuum storage tank pressure and liquid level system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921232558.7U CN211118749U (en) | 2019-08-01 | 2019-08-01 | L NG vacuum storage tank pressure and liquid level system |
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| Publication Number | Publication Date |
|---|---|
| CN211118749U true CN211118749U (en) | 2020-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921232558.7U Withdrawn - After Issue CN211118749U (en) | 2019-08-01 | 2019-08-01 | L NG vacuum storage tank pressure and liquid level system |
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| CN (1) | CN211118749U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110486622A (en) * | 2019-08-01 | 2019-11-22 | 浙江大川空分设备有限公司 | A kind of LNG vacuum storage tank pressure, liquid level control system |
-
2019
- 2019-08-01 CN CN201921232558.7U patent/CN211118749U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110486622A (en) * | 2019-08-01 | 2019-11-22 | 浙江大川空分设备有限公司 | A kind of LNG vacuum storage tank pressure, liquid level control system |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20200728 Effective date of abandoning: 20210618 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20200728 Effective date of abandoning: 20210618 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |