CN112682542A - Improved liquid level pressure tapping structure of torch water-sealed tank - Google Patents
Improved liquid level pressure tapping structure of torch water-sealed tank Download PDFInfo
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- CN112682542A CN112682542A CN202011574773.2A CN202011574773A CN112682542A CN 112682542 A CN112682542 A CN 112682542A CN 202011574773 A CN202011574773 A CN 202011574773A CN 112682542 A CN112682542 A CN 112682542A
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Abstract
The invention relates to the determination of pressure taking position in the liquid level measurement of a flare water sealed tank, in particular to an improved structure for liquid level pressure taking of the flare water sealed tank, which comprises the following steps: a torch water sealing tank, a liquid level measuring system, a sewage draining and dewatering system and a valve; a liquid level measuring system is arranged on one side of the flare water sealed tank, a blowdown dehydration system is arranged at the bottom of the flare water sealed tank, one side of the liquid level measuring system is connected to the blowdown dehydration system, the side, connected with the blowdown dehydration system, of the liquid level measuring system forms a positive pressure tapping side of the flare water sealed tank, and the other side of the liquid level measuring system is a negative pressure tapping side of the flare water sealed tank; the pressure sampling pipe with the structure is not easy to block; the sewage is not accumulated near the sewage valve, even if a small amount of sewage is accumulated to block the sewage valve, the pipeline can be quickly and smoothly treated by blowing nitrogen or steam, and the maintenance amount of teams and groups is reduced; a double-flange liquid level meter is added and is arranged in parallel with the magnetic float liquid level meter, the double-flange liquid level meter and the magnetic float liquid level meter are mutually referred and have insufficient complementation, and double insurance is added; and reliable guarantee is provided for safe production.
Description
Technical Field
The invention relates to determination of a pressure taking position in liquid level measurement of a flare water sealed tank, in particular to an improved structure for liquid level pressure taking of the flare water sealed tank, which is suitable for liquid level measurement of a horizontal tank.
Background
The positive pressure point position of a magnetic float level meter of a liquid level measuring instrument of a torch water-sealed tank is positioned at the bottom of the tank, positive and negative pressure measuring pipes for liquid level measurement of a normally horizontal tank are arranged on the side surface of the tank, the measurement accuracy is designed and considered, the positive pressure point position is designed at the bottom of the tank, but dirt of the tank and the maintenance of the instrument are not considered; the positive pressure taking point at the bottom of the tank is a leading-out opening of DN15 carbon steel, a welding elbow of DN15 and a welding steel pipe of DN15 are needed to be extended by 2 meters and connected with the positive pressure taking point of the liquid level meter, the pressure taking position of the structure is easier to cause the blockage of the positive pressure taking point, and the horizontal tank receives mixed discharge tail gas of all devices (the tail gas has various substances, and some of the tail gas can also generate chemical reaction to corrode a torch discharge pipeline); after the flare water sealing tank operates for a period of time, thick dirt is generally accumulated at the tank bottom, the dirt can quickly block a drain outlet at the tank bottom and a positive pressure taking point of the magnetic float liquid level meter, the process frequently discharges the dirt, the pipe diameter is large, the drain outlet cannot be blocked, even if the drain outlet is blocked, the blockage cannot be serious, and the positive pressure taking point of the magnetic float liquid level meter does not have a special drain outlet, and a pipeline is thin and long, so the blockage is frequent; resulting in inaccurate level measurement and affecting the process operation. When the liquid level meter is required to be accurate, the heat preservation of the primary valve needs to be firstly removed, then the rear flange of the primary valve is detached, the rubber pipe is connected with a temporary nitrogen or steam pipeline for pressurization and blowing-through, the nitrogen or steam pipeline is discharged for a period of time, and the dirty liquid in and near the pressure taking pipe is discharged, so that potential safety hazards exist, and in the period of time, the liquid level is completely in a non-monitoring state, and an operator can only operate according to experience, so that the risk that the liquid level is in the non-monitoring state is caused. The tank bottom is dirty, and the tank can be blocked quickly after treatment, so that the maintenance is difficult for the team due to the repeated treatment. Because only one liquid level meter is installed on the site, no reference is provided after the liquid level meter breaks down, the liquid level cannot be monitored by internal operation, the liquid level cannot be observed by external operation, and hidden dangers are brought to safety production.
Disclosure of Invention
In view of the technical problems, the invention improves the liquid level pressure taking structure of the flare water sealed tank, prevents the positive pressure taking point position of the liquid level meter of the pressure taking pipe from being blocked by changing the pressure taking point position, and enables dirt to be discharged in time without being accumulated near the blow-down valve, thereby reducing the maintenance amount of teams.
In order to achieve the purpose, the invention adopts the technical scheme that: torch water seal tank liquid level is got and is pressed and is improved structure includes: a torch water sealing tank, a liquid level measuring system, a sewage draining and dewatering system and a valve; a liquid level measuring system is arranged on one side of the flare water sealed tank, a blowdown dehydration system is arranged at the bottom of the flare water sealed tank, one side of the liquid level measuring system is connected to the blowdown dehydration system, the side, connected with the blowdown dehydration system, of the liquid level measuring system forms a positive pressure tapping side of the flare water sealed tank, and the other side of the liquid level measuring system is a negative pressure tapping side of the flare water sealed tank;
the liquid level measurement system connected with the sewage drainage and dehydration system is used for measuring the liquid level of the flare water sealing tank, so that the blockage of the pressure taking pipe can be prevented;
further, the liquid level measuring system comprises: the positive pressure sides of the magnetic float liquid level meter and the double-flange liquid level meter are connected to the sewage draining and dewatering system in a parallel mode; the positive pressure sides of the magnetic float liquid level meter and the double-flange liquid level meter are connected with a positive pressure side primary valve, a tee joint and two positive pressure side secondary valves through pipelines, and the positive pressure sides of the magnetic float liquid level meter and the double-flange liquid level meter are respectively connected with the positive pressure sides; the negative pressure sides of the magnetic float liquid level meter and the double-flange liquid level meter are connected with a negative pressure side primary valve, a tee joint and two negative pressure side secondary valves through pipelines, and the negative pressure sides of the magnetic float liquid level meter and the double-flange liquid level meter are respectively connected with the negative pressure sides; a drain pipeline is arranged at the bottom of the magnetic float liquid level meter, and a drain valve of the magnetic float liquid level meter is arranged on the drain pipeline;
furthermore, two positive pressure side secondary valves of the magnetic float liquid level meter and the double-flange liquid level meter are connected with a flange tee joint on a pipeline at the positive pressure side of the magnetic float liquid level meter through a connecting sewage drainage and dehydration system; the two secondary valves on the negative pressure sides of the magnetic float liquid level meter and the double-flange liquid level meter are connected with a flange tee joint of a pipeline of the water seal tank through connecting the negative pressure sides of the magnetic float liquid level meter;
furthermore, a straight-through valve of a flange tee joint at the positive pressure side of the magnetic float liquid level meter is connected with a positive pressure taking point of the magnetic float liquid level meter, and the other valve is connected with the positive pressure side of the double-flange liquid level meter;
further, the blowdown dewatering system includes: a blow-off pipeline at the bottom of the torch water-sealed tank, a blow-off valve at the bottom of the torch water-sealed tank, a blow-off dehydrator, a bottom pipeline of the blow-off dehydrator, a bottom pipeline valve of the blow-off dehydrator and a communication pipeline with the liquid level measuring system; the bottom of the torch water seal tank is connected with one end of a blowdown pipeline at the bottom of the torch water seal tank, a blowdown valve is arranged on the blowdown pipeline at the bottom of the torch water seal tank, the other end of the blowdown pipeline at the bottom of the torch water seal tank is connected to the upper part of the blowdown dehydrator, an opening is formed in the upper part of the blowdown dehydrator, and the opening is connected with a communication pipeline connected with a liquid level measuring system; the bottom of the sewage draining dehydrator is connected to a sewage draining well through a pipeline at the bottom of the sewage draining dehydrator; two valves are arranged on the pipeline at the bottom of the sewage draining dehydrator in series;
furthermore, valves in the liquid level measuring system are gate valves with flanges; the positive pressure side primary valves of the magnetic float liquid level meter and the double-flange liquid level meter adopt DN15 flange gate valves;
furthermore, valves on a blowdown valve at the bottom of the torch water seal tank and a pipeline at the bottom of the blowdown dehydrator are DN80 flanged gate valves;
furthermore, the bottom of the flare water seal tank is positioned above a communication pipeline of the liquid level measurement system and is connected with an original magnetic float liquid level meter pipeline, and the original magnetic float liquid level meter pipeline is connected with the blind cover through the pipeline.
Furthermore, a purging pipeline is connected between two valve gate valves on the pipeline at the bottom of the sewage draining dehydrator, and a purging gate valve with a flange is arranged on the purging pipeline; when a blow-down valve at the bottom of the tank is blocked, the liquid level indication fails and the blow-down valve cannot discharge dirt, introducing gas into the blow-down dehydrator through a blow-down pipeline and blowing the pipeline through by applying pressure;
further, nitrogen or steam is introduced into the purge line.
The invention has the beneficial effects that: according to the principle of a communicating vessel, the original easily-blocked pressure-taking pipe is changed into a structure that the pressure-taking pipe is led to a dehydrator through a blow-down valve, the pressure is taken from the upper part of the dehydrator, the height of the pressure-taking pipe is the same as that of the original pressure-taking position, the measuring range of an instrument is not changed, and the pressure-taking pipe is not easy to block; dirt is discharged in time and is not accumulated near the blow-down valve, even if a small amount of dirt is accumulated to block the blow-down valve, the pipeline can be quickly and smoothly treated by blowing nitrogen or steam, and the maintenance amount of teams and groups is reduced; a double-flange liquid level meter is added and is arranged in parallel with the magnetic float liquid level meter, the double-flange liquid level meter and the magnetic float liquid level meter are mutually referred and have insufficient complementation, and double insurance is added; and reliable guarantee is provided for safe production.
Drawings
FIG. 1 is a block diagram of the present invention.
In the figure, 1, a flare water seal tank, 2, a magnetic float level meter, 3, a double-flange level meter, 4, a magnetic float level meter positive pressure side primary valve, 5, a magnetic float level meter positive pressure side secondary valve, 6, a magnetic float level meter negative pressure side primary valve, 7, a magnetic float level meter negative pressure side secondary valve, 8, a magnetic float level meter blow-off valve, 9, a flare water seal tank bottom blow-off pipeline, 10, a flare water seal tank bottom blow-off valve, 11, a blow-off dehydrator, 12, a blow-off dehydrator bottom pipeline, 13, a communication pipeline with a liquid level measurement system, 14, an original magnetic float level meter gate valve, 15, a blow-off pipeline, 16, a blow-off gate valve, 17 and a blow-off well.
Detailed Description
As shown in the figure, the liquid level of flare water-sealed tank is got and is pressed and improve the structure, include: the device comprises a torch water sealing tank 1, a liquid level measuring system, a sewage draining and dewatering system and a valve; a liquid level measuring system is arranged on one side of the flare water sealed tank 1, a blowdown dehydration system is arranged at the bottom of the flare water sealed tank 1, one side of the liquid level measuring system is connected to the blowdown dehydration system, the side, connected with the blowdown dehydration system, of the liquid level measuring system forms a positive pressure taking side of the flare water sealed tank 1, and the other side of the liquid level measuring system is a negative pressure taking side of the flare water sealed tank 1;
the liquid level measuring system comprises: the positive pressure sides of the magnetic float liquid level meter and the double-flange liquid level meter are connected to a sewage draining and dewatering system in a parallel mode; the positive pressure sides of the magnetic float level meter 2 and the double-flange level meter 3 are connected with a positive pressure side primary valve, a tee joint and two positive pressure side secondary valves through pipelines, and the positive pressure sides are respectively used for connecting the positive pressure sides of the magnetic float level meter 2 and the double-flange level meter 3; the negative pressure sides of the magnetic float liquid level meter and the double-flange liquid level meter are connected with a negative pressure side primary valve, a tee joint and two negative pressure side secondary valves through pipelines, and the negative pressure sides of the magnetic float liquid level meter 2 and the double-flange liquid level meter 3 are respectively connected;
a drain pipeline is arranged at the bottom of the magnetic float liquid level meter 2, and a drain valve 8 of the magnetic float liquid level meter is arranged on the drain pipeline;
in the above, a positive pressure side primary valve 4 and two positive pressure side secondary valves 5 on the positive pressure side of the magnetic float level meter 2 are connected; a negative pressure side primary valve 6 and two negative pressure side secondary valves 7 which are connected with the negative pressure side of the magnetic float liquid level meter 2;
the two positive pressure side secondary valves of the magnetic float liquid level meter 2 and the double-flange liquid level meter 3 are connected with a flange tee joint on a pipeline at the positive pressure side of the magnetic float liquid level meter through a connecting sewage drainage and dehydration system; the two secondary valves on the negative pressure sides of the magnetic float liquid level meter and the double-flange liquid level meter are connected with a flange tee joint of a pipeline of the water seal tank 1 through connecting the negative pressure sides of the magnetic float liquid level meter;
a straight-through valve of a flange tee joint at the positive pressure side of the magnetic float liquid level meter is connected with a positive pressure taking point of the magnetic float liquid level meter, and the other valve is connected with the positive pressure side of the double-flange liquid level meter 3;
the blowdown dewatering system include: a blow-off pipeline 9 at the bottom of the torch water-sealed tank, a blow-off valve 10 at the bottom of the torch water-sealed tank, a blow-off dehydrator 11, a bottom pipeline 12 of the blow-off dehydrator, a bottom pipeline valve of the blow-off dehydrator and a communication pipeline 13 with a liquid level measuring system; the bottom of the torch water-sealed tank 1 is connected with one end of a blowdown pipeline 9 at the bottom of the torch water-sealed tank, a blowdown valve 10 is arranged on the blowdown pipeline 9 at the bottom of the torch water-sealed tank, the other end of the blowdown pipeline 9 at the bottom of the torch water-sealed tank is connected to the upper part of a blowdown dehydrator 11, an opening is formed in the upper part of the blowdown dehydrator 11, and the opening is connected with a communication pipeline 13 of a liquid level measurement system; the bottom of the sewage draining dehydrator 11 is connected to a sewage draining well 17 through a sewage draining dehydrator bottom pipeline 12; two valves are arranged on the bottom pipeline 12 of the sewage draining dehydrator in series;
valves in the liquid level measuring system are gate valves with flanges; the positive pressure side primary valves of the magnetic float liquid level meter 2 and the double-flange liquid level meter 3 adopt DN15 flange gate valves;
the valves on the blowoff valve 10 at the bottom of the torch water seal tank and the pipeline 12 at the bottom of the blow-off dehydrator are DN80 flange gate valves;
the bottom of the flare water sealing tank 1 is connected with the pipeline of the original magnetic float level meter above the communication pipeline 13 of the liquid level measuring system, and the original magnetic float level meter is connected with a gate valve 14 of the blind cover through the pipeline.
A purging pipeline 15 is connected between two valve gate valves on the bottom pipeline 12 of the sewage draining dehydrator, and a purging gate valve 16 with a flange is arranged on the purging pipeline 15.
The installation method is that a blowdown dehydrator 11 is installed below a tank bottom blowdown valve 10, a DN15 flange gate valve is installed at an opening above the blowdown dehydrator 11, the flange gate valve is connected with a prefabricated flange tee joint through a carbon steel pipe and is consistent with the installation height of an original pressure sampling pipe, the flange gate valve 14 on the positive pressure side of an original magnetic float level meter is closed, a flange behind a positive pressure side valve is detached, and a blind cover is additionally installed behind the original primary valve; the other two flanges of the tee joint are respectively connected with a flange gate valve, wherein the straight-through flange gate valve is connected with a positive pressure taking point of the magnetic float liquid level meter, and the other flange gate valve is connected with a positive pressure side flange of the double-flange liquid level meter; and simultaneously closing the magnetic float level meter negative pressure side flange gate valve, disassembling the negative pressure side valve rear flange, and installing the negative pressure side of the level meter according to the same method of the positive pressure side. A DN80 flanged gate valve is added at the lower opening of the sewage draining dehydrator 11 and is connected with another DN80 flanged gate valve by a pipeline, a nitrogen or steam purging pipeline 15 is arranged at the upper opening of the pipeline between the two valves, the nitrogen or steam purging pipeline 15 is additionally provided with a flanged gate valve 16 for control, and finally the sewage draining pipeline is connected to a sewage well 17 by a pipeline. When the blowoff valve is blocked, the liquid level indication is failed, and dirt can not be discharged through the blowoff valve, the DN80 flanged gate valve rear hand valve is closed, nitrogen or steam is introduced into the dehydrator, the dehydrator can be blown through by slight pressure, the positive pressure point flanged gate valve is closed before the nitrogen or steam is introduced, and the pressure on the single side of the instrument is prevented.
The key point of the invention is that the principle of the communicating vessel is fully exerted, the pressure taking position of the liquid level meter is changed from the pressure taking of the tank body to the pressure taking of the tank body, the pressure taking is led out by the blow-down valve, the pressure is taken above the blow-down dehydrator, and the measuring range of the instrument is not changed; the purging pipeline is additionally arranged between the two flange gate valves below the dehydrator, so that the instrument is easy to maintain when being blocked due to faults, and the original instrument faults which are troublesome to treat are easy and simplified; increase the double flange level gauge on the basis of original magnetism float level gauge, increased the dual fail-safe, refer to each other, through closing the flange gate valve when the level gauge is maintained and is handled, two level gauges can not influence each other when handling respectively, and if there is a level gauge when breaking down, another still is measuring, can not appear interrupting the level measurement.
1) During the shutdown and overhaul period, the water-sealed tank is treated to have a fire condition, and an installation team with qualification requests that a side hole which is not easy to block of the water-sealed tank is used as a lower pressure taking point, and meanwhile, a purging pipeline is designed, and a double-flange liquid level meter or a buoy liquid level meter is added.
2) The bottom of the sewage draining dehydrator can be directly additionally provided with the purging pipeline, and the purging point is easy to be close to the DN80 point position, so that the valve is prevented from being blocked. Through the technical transformation, two hidden dangers that a positive pressure point is frequently blocked and no reference exists in instrument maintenance are avoided.
Claims (9)
1. Torch water seal tank liquid level is got and is pressed and is improved structure, its characterized in that includes: a torch water sealing tank, a liquid level measuring system, a sewage draining and dewatering system and a valve; one side that is located the flare water seal tank is equipped with liquid level measurement system, and blowdown dewatering system sets up in the bottom of flare water seal tank, and one side of liquid level measurement system is connected to blowdown dewatering system, and one side that liquid level measurement system and blowdown dewatering system are connected forms the positive pressure side of getting of flare water seal tank, and the opposite side of liquid level measurement system is the negative pressure side of getting of flare water seal tank.
2. The improved structure of the flare water sealing tank for liquid level pressure taking of claim 1, which is characterized in that: the liquid level measuring system comprises: the positive pressure sides of the magnetic float liquid level meter and the double-flange liquid level meter are connected to the sewage draining and dewatering system in a parallel mode; the positive pressure sides of the magnetic float liquid level meter and the double-flange liquid level meter are connected with a positive pressure side primary valve, a tee joint and two positive pressure side secondary valves through pipelines, and the positive pressure sides of the magnetic float liquid level meter and the double-flange liquid level meter are respectively connected with the positive pressure sides; the negative pressure sides of the magnetic float liquid level meter and the double-flange liquid level meter are connected with a negative pressure side primary valve, a tee joint and two negative pressure side secondary valves through pipelines, and the negative pressure sides of the magnetic float liquid level meter and the double-flange liquid level meter are respectively connected with the negative pressure sides; and a blow-off pipeline is arranged at the bottom of the magnetic float liquid level meter, and a blow-off valve of the magnetic float liquid level meter is arranged on the blow-off pipeline.
3. The improved structure of liquid level pressure taking of the flare water seal tank of claim 2, which is characterized in that: the two positive pressure side secondary valves of the magnetic float liquid level meter and the double-flange liquid level meter are connected with a flange tee joint on a pipeline at the positive pressure side of the magnetic float liquid level meter through a connecting sewage drainage and dehydration system; the secondary valves on the two negative pressure sides of the magnetic float liquid level meter and the double-flange liquid level meter are connected with a flange tee joint of a pipeline of the water seal tank through connecting the negative pressure side of the magnetic float liquid level meter.
4. The improved structure of claim 3 for liquid level pressure tapping of the flare water sealed tank, which is characterized in that: the straight-through valve of the flange tee joint at the positive pressure side of the magnetic float liquid level meter is connected with the positive pressure taking point of the magnetic float liquid level meter, and the other valve is connected with the positive pressure side of the double-flange liquid level meter.
5. The improved structure of the flare water sealing tank for liquid level pressure taking of claim 1, which is characterized in that: the blowdown dewatering system include: a blow-off pipeline at the bottom of the torch water-sealed tank, a blow-off valve at the bottom of the torch water-sealed tank, a blow-off dehydrator, a bottom pipeline of the blow-off dehydrator, a bottom pipeline valve of the blow-off dehydrator and a communication pipeline with the liquid level measuring system; the bottom of the torch water seal tank is connected with one end of a blowdown pipeline at the bottom of the torch water seal tank, a blowdown valve is arranged on the blowdown pipeline at the bottom of the torch water seal tank, the other end of the blowdown pipeline at the bottom of the torch water seal tank is connected to the upper part of the blowdown dehydrator, an opening is formed in the upper part of the blowdown dehydrator, and the opening is connected with a communication pipeline connected with a liquid level measuring system; the bottom of the sewage draining dehydrator is connected to a sewage draining well through a pipeline at the bottom of the sewage draining dehydrator; two valves are arranged in series on the bottom pipeline of the sewage draining dehydrator.
6. The improved structure of liquid level pressure taking of the flare water seal tank of claim 2, which is characterized in that: valves in the liquid level measuring system are gate valves with flanges; the positive pressure side primary valve of the magnetic float liquid level meter and the double-flange liquid level meter adopts a DN15 flange gate valve.
7. The improved structure of liquid level pressure taking of the flare water seal tank of claim 5, which is characterized in that: and the blowoff valve at the bottom of the torch water seal tank and the valves on the pipelines at the bottoms of the blowoff dehydrator are DN80 flanged gate valves.
8. The improved structure of liquid level pressure taking of the flare water seal tank of claim 5, which is characterized in that: and a purging pipeline is connected between the two valve gate valves on the pipeline at the bottom of the sewage draining dehydrator, and a purging gate valve with a flange is arranged on the purging pipeline.
9. The improved structure of liquid level pressure taking of the flare water seal tank of claim 8, which is characterized in that: nitrogen or steam is introduced into the purge line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011574773.2A CN112682542A (en) | 2020-12-28 | 2020-12-28 | Improved liquid level pressure tapping structure of torch water-sealed tank |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011574773.2A CN112682542A (en) | 2020-12-28 | 2020-12-28 | Improved liquid level pressure tapping structure of torch water-sealed tank |
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| CN112682542A true CN112682542A (en) | 2021-04-20 |
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| CN202011574773.2A Pending CN112682542A (en) | 2020-12-28 | 2020-12-28 | Improved liquid level pressure tapping structure of torch water-sealed tank |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114018366A (en) * | 2021-10-29 | 2022-02-08 | 临涣焦化股份有限公司 | Liquid level meter capable of being automatically cleaned |
-
2020
- 2020-12-28 CN CN202011574773.2A patent/CN112682542A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114018366A (en) * | 2021-10-29 | 2022-02-08 | 临涣焦化股份有限公司 | Liquid level meter capable of being automatically cleaned |
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