CN211649833U - Differential pressure transmitter negative pressure chamber stabilizing device convenient to install - Google Patents
Differential pressure transmitter negative pressure chamber stabilizing device convenient to install Download PDFInfo
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- CN211649833U CN211649833U CN201922483991.4U CN201922483991U CN211649833U CN 211649833 U CN211649833 U CN 211649833U CN 201922483991 U CN201922483991 U CN 201922483991U CN 211649833 U CN211649833 U CN 211649833U
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Abstract
The utility model discloses a differential pressure transmitter negative pressure chamber stabilising arrangement convenient to installation belongs to the natural gas chemical industry technical field, including liquid storage pot and differential pressure transmitter, the negative pressure taking port of liquid storage pot is connected with differential pressure transmitter's negative pressure chamber through the negative pressure pipe, and positive pressure taking port is connected with differential pressure transmitter's positive pressure chamber through the positive pressure pipe, be equipped with the second stop valve between negative pressure pipe and the negative pressure chamber between first stop valve, positive pressure pipe and the positive pressure chamber; a gas-liquid separation buffer tank is arranged between the negative pressure taking port and the first stop valve, and a vaporization tank is arranged between the positive pressure taking port and the second stop valve. The utility model provides an among the prior art differential pressure transmitter require highly to the mounted position condition to and liquid flow in negative pressure pipe leads to the unsafe consequence scheduling problem of liquid level display of liquid storage pot, and both had been applicable to low temperature liquid storage equipment, also was applicable to high temperature liquid storage equipment, and application scope is wide, and it is convenient to install, is worth promoting.
Description
Technical Field
The utility model relates to a natural gas chemical industry technical field specifically is a differential pressure transmitter negative pressure chamber stabilising arrangement convenient to installation.
Background
There are many separators or vessel towers in LNG production facilities, and the level measurement of the separators or towers in these LNG production facilities is by means of differential pressure transmitters. These differential pressure transmitters can transmit data to both the DCS for control and the SIS (safety interlock instrumentation). The traditional differential pressure transmitter installation mode is that the differential pressure transmitter and the positive pressure taking port of the separator or the tower are installed at the same horizontal height, the inlet of the positive pressure chamber of the differential pressure transmitter and the lowest liquid level set by the separator or the tower are at the same horizontal line, the negative pressure chamber of the differential pressure transmitter is connected with the negative pressure taking port of the separator or the tower through a negative pressure leading pipe, and the negative pressure taking port is higher than the highest liquid level set by the separator or the tower. Because the restriction of space and other equipment can appear unsatisfied the condition that the changer was installed according to traditional mode in on-the-spot actual installation, get the pressure mouth and cross low etc. like the storage tank, finally will appear in order to satisfy the installation requirement and unaesthetic mounting means or the mounting means that appears irregularities to influence the accuracy that differential pressure transmitter liquid level shows.
Meanwhile, when the liquid level in the separator or the tower is lower than the position of the negative pressure taking port of the separator or the tower, the differential pressure transmitter can correctly measure the liquid level of the separator or the tower. When the liquid level in the separator or the tower is higher than a negative pressure taking port of the separator or the tower, the liquid flows into a negative pressure leading pipe, the liquid level display of the separator or the tower is inaccurate, the misoperation of a valve can be caused if the liquid level in the separator or the tower is light, and the interlocking parking of the whole device can be caused if the liquid level in the separator or the tower is serious. If the separator or the tower is filled with high-temperature liquid, the high-temperature gas at the upper end of the liquid level in the separator or the tower can be condensed into liquid in the negative pressure leading pipe, and inaccurate liquid level display can be caused. And the condensate in the negative pressure pipe also needs to be discharged on site by personnel at regular intervals, so that the labor intensity of the operators is increased, and the safety risk caused by misoperation can be caused in the site discharge work.
Disclosure of Invention
An object of the utility model is to provide a differential pressure transmitter negative pressure chamber stabilising arrangement convenient to installation solves among the prior art differential pressure transmitter and requires highly to the mounted position condition to and when the liquid level of liquid storage pot was higher than its negative pressure port of getting, liquid flow in negative pressure pipe leads to the unsafe consequence scheduling problem of liquid level display of liquid storage pot.
In order to achieve the above object, the utility model provides a following technical scheme: a differential pressure transmitter negative pressure chamber stabilizing device convenient to install comprises a liquid storage tank and a differential pressure transmitter, wherein a negative pressure taking port of the liquid storage tank is connected with a negative pressure chamber of the differential pressure transmitter through a negative pressure leading pipe;
a gas-liquid separation buffer tank is further arranged between the negative pressure taking port of the liquid storage tank and the first stop valve, an inlet on the side wall of the gas-liquid separation buffer tank is connected with the negative pressure taking port through a negative pressure leading pipe, the inlet on the side wall of the gas-liquid separation buffer tank and the negative pressure taking port are located at the same horizontal height, and an outlet on the top of the gas-liquid separation buffer tank is connected with a negative pressure chamber of the differential pressure transmitter through the negative pressure leading pipe;
and a vaporization tank is also arranged between the positive pressure taking port of the liquid storage tank and the second stop valve, the bottom inlet of the vaporization tank is connected with the positive pressure taking port through a positive pressure leading pipe, and the top outlet of the vaporization tank is connected with the positive pressure chamber of the differential pressure transmitter through a positive pressure leading pipe.
Further, a guiding and leaching valve is arranged at the bottom of the gas-liquid separation buffer tank.
Further, a third stop valve is arranged between the positive pressure taking port and the vaporization tank.
Furthermore, a low-temperature heat tracing device is arranged outside the positive pressure guide pipe.
Further, the low-temperature heat tracing device is a shielding anti-corrosion low-temperature heat tracing pipeline.
Furthermore, a barometer is arranged between the vaporization tank and the second stop valve.
Furthermore, a fourth stop valve is arranged between the gas-liquid separation buffer tank and the negative pressure taking port.
Through above-mentioned technical scheme, when the liquid level was higher than its negative pressure port in the liquid storage tank, liquid flows into in the gas-liquid separation buffer tank through the negative pressure pipe, and the liquid that flows into in the gas-liquid separation buffer tank is deposited in its bottom, and the export of gas-liquid separation buffer tank is located the top to guarantee that liquid can not flow into in the negative pressure pipe of gas-liquid separation buffer tank exit end, thereby avoid causing the influence to the liquid level display of pressure differential transmitter. Meanwhile, a positive pressure taking port of the liquid storage tank is connected with the bottom of the vaporization tank, and an outlet at the top of the vaporization tank is connected with a positive pressure chamber of the differential pressure transmitter through a second stop valve, so that the low-temperature liquid at the high-pressure side of the liquid storage tank is sufficiently gasified, the pressure generated by the liquid level in the liquid storage tank is transmitted to the differential pressure transmitter through the gasified gas, and the low-temperature liquid does not directly contact with the differential pressure transmitter, so that the differential pressure transmitter is prevented from being damaged; the gas discharged from the outlet at the top of the vaporization tank is at the ambient temperature, so that the phenomenon of inaccurate measurement caused by the formation of a liquid column due to gas condensation can be avoided; meanwhile, the connection mode ensures that the vaporization tank and the differential pressure transmitter are all gas, and the gas can not generate pressure change, so that the position of the differential pressure transmitter can be installed at any position of the liquid storage tank as long as the outlet at the top of the vaporization tank is connected with the positive pressure chamber of the differential pressure transmitter, thereby solving the installation problem and the problem of frequent liquid drainage of operators.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
1. the gas-liquid separation buffer tank is arranged between the negative pressure leading port and the negative pressure chamber of the differential pressure transmitter, so that the result that the liquid level display of the liquid storage tank is inaccurate due to the fact that liquid flows into the negative pressure leading pipe when the liquid level of the liquid storage tank is higher than the negative pressure taking port of the liquid storage tank is avoided; the vaporization tank is arranged between the liquid storage tank and the differential pressure transmitter, so that direct contact between low-temperature liquid and the differential pressure transmitter is isolated, the damage to the differential pressure transmitter is avoided, the generation of a liquid column is also avoided, and the liquid level display accuracy of the differential pressure transmitter is ensured. Through the technical scheme, the error of parameter control of a central control operator caused by error signals of the differential pressure transmitter is reduced, the times of interlocking and stopping of the device caused by false signals are avoided, the production operation is safer, and the energy consumption can be obviously saved from the energy perspective. 2. The LNG pressure tapping device is suitable for various unfavorable installation conditions, the requirement on installation positions is low, the problem of migration change is avoided, and the installation labor amount of workers on the pressure tapping device in LNG production operation is reduced; 3. the device is suitable for low-temperature liquid storage equipment and high-temperature liquid storage equipment, and has a wide application range; 4. the cost for purchasing the low-temperature transmitter is reduced, and the control effect on the production cost is obvious.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1. the system comprises a liquid storage tank, a negative pressure taking port, a positive pressure taking port, a 1b differential pressure transmitter, a 2a negative pressure chamber, a 2b positive pressure chamber, a 3 negative pressure leading pipe, a 4 positive pressure leading pipe, a 5 first stop valve, a 6 second stop valve, a 7 vaporization tank, a 8 third stop valve, a 9 low-temperature heat tracing device, a 10 gas pressure gauge, a 11 gas-liquid separation buffer tank, a 12 guide shower valve, a 13 fourth stop valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. 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.
As shown in fig. 1, a differential pressure transmitter negative pressure chamber stabilizing device convenient to mount comprises a liquid storage tank 1 and a differential pressure transmitter 2, wherein a negative pressure taking port 1a of the liquid storage tank 1 is connected with a negative pressure chamber 2a of the differential pressure transmitter 2 through a negative pressure introducing pipe 3, a positive pressure taking port 1b of the liquid storage tank 1 is connected with a positive pressure chamber 2b of the differential pressure transmitter 2 through a positive pressure introducing pipe 4, a first stop valve 5 is arranged between the negative pressure introducing pipe 3 and the negative pressure chamber 2a, and a second stop valve 6 is arranged between the positive pressure introducing pipe 4 and the positive pressure chamber 2 b; a gas-liquid separation buffer tank 11 is further arranged between the negative pressure taking port 1a of the liquid storage tank 1 and the first stop valve 5, an inlet (not shown in the figure) on the side wall of the gas-liquid separation buffer tank 11 is connected with the negative pressure taking port 1a through a negative pressure leading pipe 3, the inlet on the side wall of the gas-liquid separation buffer tank 11 and the negative pressure taking port 1a are located at the same horizontal height, and an outlet on the top of the gas-liquid separation buffer tank 11 is connected with a negative pressure chamber 2a of the differential pressure transmitter 2 through the negative pressure leading pipe 3; through the structure, when the liquid level in the liquid storage tank 1 is higher than the negative pressure taking port 1a of the liquid storage tank 1, liquid flows into the gas-liquid separation buffer tank 11 through the negative pressure leading pipe 3, the liquid flowing into the gas-liquid separation buffer tank 11 is stored at the bottom of the gas-liquid separation buffer tank, and the outlet of the gas-liquid separation buffer tank 11 is positioned at the top, so that the liquid is ensured not to flow into the negative pressure leading pipe 3 at the outlet end of the gas-liquid separation buffer tank 11, and the liquid level display of the differential pressure transmitter is prevented from influencing.
A vaporization tank 7 is further arranged between the positive pressure taking port 1b of the liquid storage tank 1 and the second stop valve 6, an inlet (not shown in the figure) at the bottom of the vaporization tank 7 is connected with the positive pressure taking port 1b through a positive pressure guiding pipe 4, and an outlet (not shown in the figure) at the top of the vaporization tank 7 is connected with a positive pressure chamber 2b of the differential pressure transmitter 2 through the positive pressure guiding pipe 4; through the structure, the low-temperature liquid on the high-pressure side of the liquid storage tank 1 enters the vaporization tank 7 and is gasified in the vaporization tank 7, so that the pressure generated by the liquid level in the liquid storage tank 1 is transmitted to the differential pressure transmitter 2 through the gasified gas, the gas is at the ambient temperature, the phenomenon of inaccurate measurement caused by the formation of a liquid column due to the condensation of the gas can not occur, and the damage of the transmitter caused by the direct contact of the low-temperature liquid with the transmitter is also avoided.
Preferably, the bottom of the gas-liquid separation buffer tank 11 is further provided with a pilot valve 12, and when the liquid in the gas-liquid separation buffer tank 11 needs to be discharged, the pilot valve 12 is opened.
Preferably, a third stop valve 8 is further provided between the positive pressure tapping 1b and the vaporization tank 7, and when the vaporization tank 7 needs to be repaired, the third stop valve 8 is closed to stop the flow of the cryogenic liquid.
Preferably, the positive pressure pipe 4 is externally provided with a low-temperature heat tracing device 9, in this embodiment, a shielding anti-corrosion low-temperature heat tracing pipeline is preferred, and when the device is used in a particularly severe cold environment, the positive pressure pipe is subjected to heat tracing and heat preservation through the low-temperature heat tracing pipeline, so that influence of pipeline condensate on measurement can be avoided.
As a preferable scheme, a gas pressure gauge 10 is further arranged between the vaporization tank 7 and the second stop valve 6, and through the gas pressure gauge 10, an operator can preliminarily know the gas pressure in the positive pressure pipe 4, and can preliminarily judge the validity of the pressure value.
As a preferable scheme, furthermore, a fourth stop valve 13 is arranged between the gas-liquid separation buffer tank 11 and the negative pressure taking port 1a, so that when an operator needs to discharge the liquid in the gas-liquid separation buffer tank 11, the fourth stop valve 13 is closed first to avoid influencing the pressure in the liquid storage tank 1.
In the above description of the present invention, it should be understood that the terms "upper", "lower", "inner", "outer", "top", "bottom", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that the product of the present invention is usually placed when in use, or the orientation or positional relationship that a person skilled in the art usually understands, and merely to facilitate the description of the present invention and simplify the 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 therefore should not be construed as limiting the present invention.
The foregoing is considered as illustrative only of certain exemplary embodiments of this invention, and is therefore to be understood that the drawings and descriptions will be regarded as illustrative in nature and not as restrictive. It should also be noted that, for those skilled in the art, a plurality of improvements and additions can be made in various ways without departing from the principles of the present invention, and these improvements and additions should also be considered as the protection scope of the present invention.
Claims (7)
1. The utility model provides a differential pressure transmitter negative pressure chamber stabilising arrangement convenient to installation, includes liquid storage pot and differential pressure transmitter, the negative pressure mouth of liquid storage pot is connected with differential pressure transmitter's negative pressure chamber through the negative pressure pipe of drawing, the positive pressure mouth of drawing of liquid storage pot is connected with differential pressure transmitter's positive pressure room through positive pressure pipe, be equipped with first stop valve between negative pressure pipe and the negative pressure chamber, be equipped with second stop valve, its characterized in that between positive pressure pipe and the positive pressure room: a gas-liquid separation buffer tank is further arranged between the negative pressure taking port of the liquid storage tank and the first stop valve, an inlet on the side wall of the gas-liquid separation buffer tank is connected with the negative pressure taking port through a negative pressure leading pipe, the inlet on the side wall of the gas-liquid separation buffer tank and the negative pressure taking port are located at the same horizontal height, and an outlet on the top of the gas-liquid separation buffer tank is connected with a negative pressure chamber of the differential pressure transmitter through the negative pressure leading pipe; and a vaporization tank is also arranged between the positive pressure taking port of the liquid storage tank and the second stop valve, the bottom inlet of the vaporization tank is connected with the positive pressure taking port through a positive pressure leading pipe, and the top outlet of the vaporization tank is connected with the positive pressure chamber of the differential pressure transmitter through a positive pressure leading pipe.
2. The differential pressure transmitter negative pressure chamber stabilizer convenient to install of claim 1, characterized in that: and a guiding and leaching valve is also arranged at the bottom of the gas-liquid separation buffer tank.
3. The differential pressure transmitter negative pressure chamber stabilizer convenient to install of claim 1, characterized in that: and a third stop valve is also arranged between the positive pressure taking port and the vaporization tank.
4. The differential pressure transmitter negative pressure chamber stabilizer convenient to install of claim 1, characterized in that: and a low-temperature heat tracing device is arranged outside the positive pressure guide pipe.
5. The differential pressure transmitter negative pressure chamber stabilizer convenient to install of claim 4, characterized in that: the low-temperature heat tracing device is a shielding anti-corrosion low-temperature heat tracing pipeline.
6. The differential pressure transmitter negative pressure chamber stabilizer convenient to install of claim 1, characterized in that: and a barometer is arranged between the vaporization tank and the second stop valve.
7. The differential pressure transmitter negative pressure chamber stabilizer convenient to install of claim 1, characterized in that: and a fourth stop valve is arranged between the gas-liquid separation buffer tank and the negative pressure taking port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922483991.4U CN211649833U (en) | 2019-12-31 | 2019-12-31 | Differential pressure transmitter negative pressure chamber stabilizing device convenient to install |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922483991.4U CN211649833U (en) | 2019-12-31 | 2019-12-31 | Differential pressure transmitter negative pressure chamber stabilizing device convenient to install |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211649833U true CN211649833U (en) | 2020-10-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922483991.4U Active CN211649833U (en) | 2019-12-31 | 2019-12-31 | Differential pressure transmitter negative pressure chamber stabilizing device convenient to install |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211649833U (en) |
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2019
- 2019-12-31 CN CN201922483991.4U patent/CN211649833U/en active Active
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