CN112623536A - Interlocking method for controlling pressure of storage tank - Google Patents
Interlocking method for controlling pressure of storage tank Download PDFInfo
- Publication number
- CN112623536A CN112623536A CN202011565213.0A CN202011565213A CN112623536A CN 112623536 A CN112623536 A CN 112623536A CN 202011565213 A CN202011565213 A CN 202011565213A CN 112623536 A CN112623536 A CN 112623536A
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- Prior art keywords
- pressure
- nitrogen
- storage tank
- valve
- sealed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/22—Safety features
- B65D90/32—Arrangements for preventing, or minimising the effect of, excessive or insufficient pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/22—Safety features
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/22—Safety features
- B65D90/24—Spillage-retaining means, e.g. recovery ponds
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
The invention belongs to the technical field of automatic control of instruments, and provides an interlocking method for controlling the pressure of a storage tank. The interlocking method adds a pressure control loop on the basis of the original method for controlling the pressure in the tank by the nitrogen sealing valve and the breather valve, adds one more method for controlling the pressure in the tank, and simultaneously, an operator can clearly see the pressure trend in the storage tank and the influence of each link on the pressure of the storage tank in a control room.
Description
Technical Field
The invention belongs to the technical field of automatic control of instruments, and relates to a pressure transmitter and a control valve for controlling the nitrogen seal pressure of a storage tank, in particular to a control interlocking method for the nitrogen seal pressure of the storage tank.
Background
The pressure control of the storage tank has multiple controls, including measures of using a breather valve, a nitrogen sealing valve, an emergency pressure relief manhole, a flow limiting orifice plate and the like.
The nitrogen sealing system arranged on the storage tank can maintain the pressure of a gas phase space in the storage tank between 0.2kPa and 0.5kPa, and when the pressure of the gas phase space is higher than 0.5kPa, the nitrogen sealing valve is closed to stop supplying nitrogen; when the pressure of the gas phase space is lower than 0.2kPa, the nitrogen sealing valve is opened, and nitrogen gas starts to be supplemented, so that the storage tank is ensured not to suck air in normal operation, and explosive gas is prevented from being formed. When the nitrogen seal valve cannot be closed in time due to failure and the pressure in the tank exceeds 1.5kPa, the nitrogen seal valve is discharged outside through the breather valve with the fire arrester; when the nitrogen-sealed valve cannot be opened timely due to failure and causes the pressure in the tank to be as low as-0.3 kPa, air is supplemented into the tank through the breather valve with the fire arrester, and the pressure in the tank is ensured to be not lower than the design pressure lower limit (-0.5kPa) of the storage tank.
According to the national standard regulation: "oil loading and unloading trestle is equipped with the railway tank car, and the oil platform is loaded the tank car, and oil loading and unloading wharf should be airtight to load oil and set up oil gas collection, recovery or processing apparatus to crude oil and finished oil (petrol, kerosene, fuel that sprays paint, chemical light oil, organic chemical) facility that oil ship (refute) was loaded, its atmospheric pollutants emission should accord with the national regulation. "
Therefore, a pressure transmitter is arranged on a pipeline where the original nitrogen sealing valve is arranged, when the pressure transmitter rises to a high set value, the valve leading to the processing device is opened, internal gas is discharged outside, and when the pressure transmitter reaches a low set value, the valve is closed.
Disclosure of Invention
The invention provides a method for controlling the pressure of a storage tank, which is shown in figure 1 and comprises the storage tank, a breather valve with a fire arrester, a self-operated regulating valve, a pressure transmitter, a regulating stop valve and an oil gas collecting, recovering or processing device.
The technical scheme of the invention is as follows:
an interlocking method for controlling the pressure of a storage tank is characterized in that a pressure transmitter 4 and a regulating stop valve 5 are additionally arranged on a traditional nitrogen-sealed storage tank 1; the nitrogen-sealed storage tank 1 is provided with an air inlet pipe and an air outlet pipe, the air inlet pipe is provided with a nitrogen-sealed valve 2, and two sides of the nitrogen-sealed valve 2 are provided with a controllable valve and a bypass valve for maintenance; the gas outlet pipe is provided with a pressure transmitter 4 for detecting the pressure in the nitrogen seal storage tank and controlling and adjusting the opening and closing of the stop valve 5 according to the setting; the air outlet pipe is divided into two branches, the first branch is provided with a breather valve 3, and the second branch is connected with an oil gas collecting, recycling or processing device 6; an adjusting stop valve 5, a flame arrester and a check valve are arranged on the second branch, and a controllable valve and a bypass valve for maintenance are arranged at two ends of the adjusting stop valve 5;
setting a pressure set value P1, a high-high interlock value P2 and a low-low interlock value P3;
the normal pressure value of the nitrogen-sealed storage tank 1 is between 0.2kPa and 0.5kPa, and the regulating stop valve 5 is closed at the moment; when the pressure rises above the safe pressure P3 of the nitrogen-sealed storage tank 1, the pressure transmitter 4 and the regulating cut-off valve 5 enter a working state; when the pressure rises to reach the value P2, the adjusting stop valve 5 enters an interlocking state, the adjusting stop valve 5 is opened, the tail gas in the nitrogen-sealed storage tank 1 is discharged to the oil gas collecting, recovering or processing device 6, and the pressure of the nitrogen-sealed storage tank 1 is gradually reduced; when the pressure of the nitrogen-sealed storage tank 1 is reduced to a value P3, the regulating cut-off valve 5 is closed, and the nitrogen-sealed storage tank 1 continues to reduce the pressure through the nitrogen-sealed valve 2; when the pressure of the nitrogen-sealed storage tank 1 is in the (P2, P3) interval, the pressure control loop enters the regulation state and carries out PID regulation along with the value (namely the storage tank pressure value) of the pressure transmitter 4, and the operation is repeated in such a way, so that the pressure of the nitrogen-sealed storage tank 1 is ensured to be in a controllable safety range.
The invention has the advantages that: on the basis of the original method for controlling the pressure in the tank by the nitrogen sealing valve and the breather valve, a pressure control loop is added, the pressure in the tank is controlled by one more method, and meanwhile, an operator can clearly see the pressure trend in the storage tank and the influence of each link on the pressure of the storage tank in a control chamber.
Drawings
FIG. 1 is a diagram of an interlock system for controlling tank pressure in accordance with the present invention.
In the figure: 1, nitrogen sealing a storage tank; 2, nitrogen sealing valve; 3, a breather valve; 4, a pressure transmitter; 5 adjusting a cut-off valve; 6 oil gas collecting, recovering or treating device.
Detailed Description
The following detailed description of the invention refers to the accompanying drawings.
Example (b):
p1 was set to 0.7kPa, P2 was set to 0.8kPa, and P3 was set to 0.6 kPa. When the pressure transmitter 4 is not less than 0.8kPa, the nitrogen-sealed storage tank enters an interlocking state, the regulating stop valve 5 is opened, the tail gas in the nitrogen-sealed storage tank 1 enters the oil gas collecting, recovering or treating device 6, and the pressure in the nitrogen-sealed storage tank 1 is gradually reduced along with the release of the gas in the nitrogen-sealed storage tank 1; when the pressure of the pressure transmitter 4 is less than 0.8kPa, the interlocking state is released, at the moment, the pressure transmitter 4 and the adjusting stop valve 5 enter the adjusting state, the opening of the adjusting stop valve 5 is adjusted at a set value of 0.7kPa, and the value of the pressure transmitter 4 is ensured to be maintained near 0.7 kPa; when the pressure of the pressure transmitter 4 is less than or equal to 0.6kPa, the device enters an interlocking state, the regulating stop valve 5 is closed, the tail gas in the nitrogen-sealed storage tank 1 stops entering the oil gas collecting, recovering or processing device 6, the nitrogen-sealed system of the storage tank starts to work at the moment, and the pressure of the nitrogen-sealed storage tank 1 is controlled by the nitrogen-sealed valve 2 and the breather valve 3, so that the pressure of the nitrogen-sealed storage tank 1 is between 0.2kPa and 0.5 kPa.
The pressure of the storage tank is small, in order to measure the pressure better, the contact area of the pressure transmitter 4 and the nitrogen-sealed storage tank 1 is slightly increased, a single-flange differential pressure transmitter with the engineering caliber DN80 is recommended to be selected, and the caliber of the adjusting stop valve is the same as the caliber of the pipeline.
Claims (1)
1. An interlocking method for controlling the pressure of a storage tank is characterized in that a pressure transmitter (4) and a regulating stop valve (5) are additionally arranged on a traditional nitrogen-sealed storage tank (1); the nitrogen-sealed storage tank (1) is provided with an air inlet pipe and an air outlet pipe, the air inlet pipe is provided with a nitrogen-sealed valve (2), and both sides of the nitrogen-sealed valve (2) are provided with a controllable valve and a bypass valve for maintenance; the gas outlet pipe is provided with a pressure transmitter (4) for detecting the pressure in the nitrogen seal storage tank and controlling and adjusting the opening and closing of the stop valve (5) according to the setting; the gas outlet pipe is divided into two branches, the first branch is provided with a breather valve (3), and the second branch is connected with a gas collecting, recovering or processing device (6); an adjusting stop valve (5), a flame arrester and a check valve are arranged on the second branch, and a controllable valve and a bypass valve for maintenance are arranged at two ends of the adjusting stop valve (5);
setting a pressure set value P1, a high-high interlock value P2 and a low-low interlock value P3;
the normal pressure value of the nitrogen-sealed storage tank (1) is between 0.2kPa and 0.5kPa, and the regulating stop valve (5) is in a closed state at the moment; when the pressure rises above the safe pressure P3 of the nitrogen-sealed storage tank (1), the pressure transmitter (4) and the regulating cut-off valve (5) enter a working state; when the pressure rises to reach the value P2, the adjusting stop valve (5) enters an interlocking state, the adjusting stop valve (5) is opened, the tail gas in the nitrogen-sealed storage tank (1) is discharged to the oil gas collecting, recovering or processing device (6), and the pressure of the nitrogen-sealed storage tank (1) is gradually reduced; when the pressure of the nitrogen-sealed storage tank (1) is reduced to a value P3, the regulating cut-off valve (5) is closed, and the nitrogen-sealed storage tank (1) continues to reduce the pressure through the nitrogen-sealed valve (2); when the pressure of the nitrogen-sealed storage tank (1) is in a (P2, P3) interval, the pressure control loop enters a regulation state and is regulated along with the value stroke PID of the pressure transmitter (4), and the operation is repeated, so that the pressure of the nitrogen-sealed storage tank (1) is ensured to be in a controllable safety range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011565213.0A CN112623536B (en) | 2020-12-25 | 2020-12-25 | Interlocking method for controlling pressure of storage tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011565213.0A CN112623536B (en) | 2020-12-25 | 2020-12-25 | Interlocking method for controlling pressure of storage tank |
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| Publication Number | Publication Date |
|---|---|
| CN112623536A true CN112623536A (en) | 2021-04-09 |
| CN112623536B CN112623536B (en) | 2022-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011565213.0A Active CN112623536B (en) | 2020-12-25 | 2020-12-25 | Interlocking method for controlling pressure of storage tank |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1376784A (en) * | 1971-02-23 | 1974-12-11 | Ishikawajima Harima Heavy Ind | Prevention of explosions in volatile-oil tanks or tank systems |
| CN104843360A (en) * | 2015-04-21 | 2015-08-19 | 洛阳瑞泽石化工程有限公司 | Nitrogen sealing device for storage tank and use method of nitrogen sealing device |
| CN204587753U (en) * | 2015-04-21 | 2015-08-26 | 洛阳瑞泽石化工程有限公司 | A kind of nitrogen seal device for storage tank |
| CN205441542U (en) * | 2015-12-28 | 2016-08-10 | 中石化洛阳工程有限公司 | Ordinary pressure storage tank device |
| CN106628721A (en) * | 2015-11-02 | 2017-05-10 | 中石化广州工程有限公司 | Device and method for collecting storage tank discharged gas |
| CN207943418U (en) * | 2018-05-31 | 2018-10-09 | 中国石油工程建设有限公司北京设计分公司 | A kind of pressure of storage tank control device |
| CN208412813U (en) * | 2018-06-15 | 2019-01-22 | 洛阳瑞泽石化工程有限公司 | Storage tank nitrogen seal system |
-
2020
- 2020-12-25 CN CN202011565213.0A patent/CN112623536B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1376784A (en) * | 1971-02-23 | 1974-12-11 | Ishikawajima Harima Heavy Ind | Prevention of explosions in volatile-oil tanks or tank systems |
| CN104843360A (en) * | 2015-04-21 | 2015-08-19 | 洛阳瑞泽石化工程有限公司 | Nitrogen sealing device for storage tank and use method of nitrogen sealing device |
| CN204587753U (en) * | 2015-04-21 | 2015-08-26 | 洛阳瑞泽石化工程有限公司 | A kind of nitrogen seal device for storage tank |
| CN106628721A (en) * | 2015-11-02 | 2017-05-10 | 中石化广州工程有限公司 | Device and method for collecting storage tank discharged gas |
| CN205441542U (en) * | 2015-12-28 | 2016-08-10 | 中石化洛阳工程有限公司 | Ordinary pressure storage tank device |
| CN207943418U (en) * | 2018-05-31 | 2018-10-09 | 中国石油工程建设有限公司北京设计分公司 | A kind of pressure of storage tank control device |
| CN208412813U (en) * | 2018-06-15 | 2019-01-22 | 洛阳瑞泽石化工程有限公司 | Storage tank nitrogen seal system |
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| Publication number | Publication date |
|---|---|
| CN112623536B (en) | 2022-12-02 |
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Address after: 12 / F, Yinhai Wanxiang, No. 701, Huangpu Road, high tech Zone, Dalian, Liaoning, 116085 Patentee after: Dalian Institute of Technology Environmental Engineering Design and Research Institute Co.,Ltd. Address before: 12 / F, Yinhai Wanxiang, No. 701, Huangpu Road, high tech Zone, Dalian, Liaoning, 116085 Patentee before: ENVIRONMENTAL ENGINEERING INSTITUTE LTD OF DALIAN University OF TECHNOLOGY |
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