CN106969260B - Liquefied natural gas low-temperature pump well exhaust system and control method - Google Patents
Liquefied natural gas low-temperature pump well exhaust system and control method Download PDFInfo
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- CN106969260B CN106969260B CN201710319857.3A CN201710319857A CN106969260B CN 106969260 B CN106969260 B CN 106969260B CN 201710319857 A CN201710319857 A CN 201710319857A CN 106969260 B CN106969260 B CN 106969260B
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- exhaust
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- pump well
- control valve
- liquid level
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/04—Arrangement or mounting of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0323—Valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/03—Mixtures
- F17C2221/032—Hydrocarbons
- F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
Abstract
The invention discloses a liquefied natural gas low-temperature pump well exhaust system and a control method, wherein the system comprises a liquid level detector arranged in a low-temperature storage tank, an exhaust pipeline connected with a pump well in the low-temperature storage tank, and an external transmission pipeline connected with the pump well in the low-temperature storage tank, wherein a low-temperature tank internal pump is arranged at the bottom of the pump well, an exhaust control valve is arranged in the exhaust pipeline, an exhaust control valve is arranged in the external transmission pipeline, the liquid level detector, the exhaust control valve and the low-temperature tank internal pump are respectively connected with a control unit, and the control unit can control the opening and closing of the exhaust control valve according to the liquid level detected by the liquid level detector, so that the exhaust time is controlled. According to the invention, the liquid level in the storage tank is detected in real time, the volume of the gas phase space is calculated through a formula, and the reasonable exhaust time of the top space of the pump well is calculated according to the efficiency curve of the pump, so that the possibility of excessive or insufficient exhaust is effectively avoided, and the occurrence of accidents is reduced.
Description
Technical Field
The invention belongs to the field of LNG (liquefied natural gas), and particularly relates to a liquefied natural gas low-temperature pump well exhaust system and a control method.
Background
Natural gas is used as a high-quality clean energy source and is more and more widely applied in production and life. Atmospheric Liquefied Natural Gas (LNG) is small in size, convenient to transport and store, and a common form of natural gas. However, due to the fact that a large amount of Boil Off Gas (BOG) occurs in the LNG during storage, for example, in the use process of an LNG storage tank, after a pump stops operating, liquid in a pump well flows back to the storage tank along with self weight, so that the liquid level in the pump well to the top space of the storage tank is filled with BOG Gas, and the part of Gas needs to be emptied in each pump starting process.
The existing exhaust method is to perform time control on an exhaust control valve and set fixed time for exhaust, so that incomplete exhaust or incomplete exhaust can be caused, and in severe cases, LNG liquid can directly enter an exhaust pipeline to cause severe vibration of the exhaust pipeline, thereby bringing danger to equipment and personnel. Therefore, in the process of starting the in-tank pump, liquid rises in the pump well to compress the gas phase space in the pump well, and in order to ensure that the gas does not enter the main pipeline, the gas needs to be exhausted, and the exhaust time needs to be strictly controlled.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the liquefied natural gas low-temperature pump well exhaust system and the control method, which achieve the automatic and intelligent exhaust function, can prevent BOG gas from entering a downstream process and liquid from entering an exhaust pipeline, and can flexibly control the exhaust time.
The invention firstly provides a liquefied natural gas low-temperature pump well exhaust system which comprises a liquid level detector arranged in a low-temperature storage tank, an exhaust pipeline connected with a pump well in the low-temperature storage tank and an external transmission pipeline connected with the pump well in the low-temperature storage tank, wherein a low-temperature tank internal pump is arranged at the bottom of the pump well, an exhaust control valve is arranged in the exhaust pipeline, an exhaust control valve is arranged in the external transmission pipeline, the liquid level detector, the exhaust control valve and the low-temperature tank internal pump are respectively connected with a control unit, and the control unit can control the opening and closing of the exhaust control valve according to the liquid level detected by the liquid level detector so as to control the exhaust time.
The control unit controls the exhaust control valve and the exhaust control valve to be opened and closed according to the liquid level detected by the liquid level detector and the working parameters of the pump in the low-temperature tank, and the purpose of accurately controlling the exhaust time is achieved.
The control unit controls the basic parameter setting, the liquid level detector, the exhaust control valve and the exhaust control valve of the system, and the control system realizes the automatic exhaust function according to the basic parameter setting and realizes the strict calculation and control of the exhaust time.
In the present invention, the level detector is, for example, a microwave radar level detector or a float level detector.
The liquid level detector is used for monitoring the liquid level in the storage tank in real time, and the detected liquid level value is input into the control unit to calculate the exhaust time.
Preferably, the exhaust line is arranged above the outgoing line for the liquid discharge.
In the present invention, the control unit is, for example, a Programmable Logic Controller (PLC) or a Distributed Control System (DCS).
The control unit receives data transmitted by the liquid level detector, executes a calculation program, and outputs instructions to the exhaust control valve and the liquid discharge control valve, and the instructions can be realized by a Programmable Logic Controller (PLC) or a Distributed Control System (DCS) system.
The invention also provides a method for controlling the exhausting of the liquefied natural gas low-temperature pump well, which comprises the following steps:
1) acquiring pump well gas phase height H1 through a liquid level detector:
H1＝H-L，
h is the design height of the pump well, and L is the in-tank liquid level value measured by the liquid level detector;
2) calculating the effective discharge volume V2 of the pump well, and calculating the formula V2 ═ P1 (H) 1 *3.14*D 2 /4)/P2，
Where P1 is the normal operating pressure of the gas in the pump well, H 1 The result obtained in the step 1) is shown as D, the design diameter of the pump well is shown as P2, and the normal working pressure of the pump in the low-temperature tank arranged at the bottom of the pump well after the pump is started is shown as P2;
3) calculating the exhaust time T, and calculating the formula T as V2/(K Q),
wherein V2 is the calculation result obtained in step 2), Q is the rated working flow rate of the pump in the cryogenic tank, and can be obtained from the working curve of the pump, which can be obtained from technical data provided by the pump manufacturer), K is the flow coefficient, and the flow coefficient of the pump in time T;
4) according to the exhaust time T obtained in the step 3), the control unit controls to open the exhaust control valve and close the exhaust control valve to exhaust; after the exhaust time T, the control unit controls to close the exhaust control valve and simultaneously opens the exhaust control valve.
In the control method, in the step 4), the pump in the low-temperature tank is started, and meanwhile, the control unit controls to open the exhaust control valve and close the exhaust control valve to exhaust; after the exhaust time T, the control unit controls to close the exhaust control valve and simultaneously opens the exhaust control valve, and the low-temperature tank pump output system enters a normal working procedure.
In the calculating step, the unit of the design height H of the pump well, the level value L in the tank measured by the liquid level detector, the gas phase height H1 of the pump well and the design diameter D of the pump well is meter (m), for example; the normal operating pressure P1 of the gas in the pump well and the normal operating pressure P2 after the pump is started are both in units of, for example, MPa (megapascals); the unit of the effective pump well discharge volume V2 is, for example, cubic meters (m) 3 ) (ii) a The nominal operating flow rate Q of the pump is, for example, in m 3 /h。
In the invention, in the starting process of the in-tank pump, the liquid level in the storage tank is detected by a liquid level detector to obtain the liquid level value L in the tank, then the gas phase height H1 of the pump well is calculated according to the design height H of the pump well, and the effective discharge volume V of the pump well is obtained through calculation, wherein V is P1 (H1 is 3.14D) 2 4)/P2, wherein P1 is the normal operating pressure of the gas in the pump well, H1 is the result obtained in step 1), D is the design diameter of the pump well, and P1 is the normal operating pressure after the pump is started.
The K value is a correction coefficient for the pump starting moment and the installation environment of the pump, and the value range is generally between 0.93 and 1.15. The value can be obtained by carrying out a wind material test after the pump is installed, and an accurate value can be obtained through the test.
The Q value is the rated working flow of the pump in the cryogenic tank, the rated working flow can be obtained from random data of the pump, and the specific parameters of each pump are different.
After the two values are calculated, the accurate time T of exhaust can be easily obtained, the output of the control unit is utilized to control the exhaust control valve to be opened at the moment when the pump is started, the exhaust control valve is closed, the exhaust control valve is automatically closed after the opening time T, the exhaust control valve is opened, and the output system of the cryogenic pump enters a normal working procedure.
Compared with the prior art, the invention has the following advantages:
the system and the control method have high automation degree and strong adaptability, can be suitable for various working conditions through parameter correction, improve the safety of the storage tank, effectively discharge gas in the pump well through controlling the gas discharge time of the pump well, and improve the safety and the reliability of the operation of process equipment.
Drawings
Fig. 1 is a schematic diagram of an lng cryogenic pump well venting system of the present invention.
Reference numerals are as follows: 1-a liquid level detector; 2-an exhaust control valve; 3-a drain control valve; 4-a control unit; 5-a pump in the low-temperature tank; 6-pump well; 7-liquefied natural gas low-temperature storage tank; 8-medium level in the tank; l1-exhaust line; l2-export line; H1-Pump well vapor height; d-design diameter of pump well.
Detailed Description
The present invention is further described below in conjunction with the appended drawings, it being clear to a person skilled in the art that these descriptions are illustrative and do not constitute any limitation of the present invention.
As shown in fig. 1, the lng pump well exhaust system of the present invention includes a liquid level detector 1 disposed in a cryogenic storage tank 7, an exhaust line L1 connected to a pump well 6 in the cryogenic storage tank, and an external line L2 connected to the pump well 6 in the cryogenic storage tank, wherein a pump 5 in the cryogenic storage tank is disposed at the bottom of the pump well, an exhaust control valve 2 is disposed in the exhaust line L1, an exhaust control valve 3 is disposed in the external line L2, the liquid level detector 1, the exhaust control valve 2, and the exhaust control valve 3 are respectively connected to a control unit 4, and the control unit 4 can control opening and closing of the exhaust control valve 2 according to the liquid level detected by the liquid level detector 1, thereby controlling the exhaust time.
And the control unit 4 controls the on-off of the exhaust control valve 2 and the exhaust control valve 3 according to the liquid level detected by the liquid level detector and the working parameters of the pump in the low-temperature tank, so that the aim of accurately controlling the exhaust time is fulfilled.
The level gauge 1 may be a microwave radar level gauge or a float level gauge.
Example 1
As shown in fig. 1, a liquefied natural gas pump well exhaust system includes liquid level detector 1, exhaust control valve 2, exhaust control valve 3, the control unit 4, pump 5 in the low temperature jar, liquid level detector 1 locates in low temperature storage tank 7, is equipped with pump well 6 in the low temperature storage tank 7, and pump well 6 bottom is located to pump 5 in the low temperature jar, and pump well 6 in the low temperature storage tank is connected with exhaust pipe L1 and defeated pipeline L2 outward, and exhaust pipe L1 and defeated pipeline L2 are equipped with exhaust control valve 2 and exhaust control valve 3 respectively, and exhaust pipe L1 establishes in defeated pipeline L2 top outward. The liquid level detector 1, the exhaust control valve 2, the exhaust control valve 3 and the low-temperature tank internal pump 5 are respectively connected with the control unit 4. The control unit 4 is a programmable controller.
The method for controlling the exhaust of the liquefied natural gas low-temperature pump well by using the system comprises the following steps:
1) acquiring the gas phase height H1 of the pump well through a liquid level detector:
H1＝H-L，
h is the design height of the pump well, and L is the in-tank liquid level value measured by the liquid level detector;
2) the effective pump well displacement volume V2 was calculated using the formula V2P 1 (H1 3.14D) 2 /4)/P2，
Wherein P1 is the normal operating pressure of gas in the pump well, H1 is the result obtained in the step 1), D is the designed diameter of the pump well, and P2 is the normal operating pressure of the pump in the cryogenic tank arranged at the bottom of the pump well after the pump is started;
3) calculating the exhaust time T, and calculating the formula T as V2/(K Q),
v2 is a calculation result obtained in the step 2), Q is a rated working flow of the pump in the cryogenic tank and can be obtained from a working curve of the pump attached randomly, K is a flow coefficient, and the flow coefficient of the pump in T time is obtained;
4) according to the exhaust time T obtained in the step 3), the control unit controls to open the exhaust control valve and close the exhaust control valve to exhaust; after the exhaust time T, the control unit controls to close the exhaust control valve and simultaneously opens the exhaust control valve.
By using the exhaust system, the gas in the pump well is effectively exhausted by accurately controlling the exhaust time of the pump well, the safety and the reliability of the operation of process equipment are improved, and the phenomenon of incomplete exhaust or incomplete exhaust does not occur in long-term test operation, and the phenomenon of severe vibration of an exhaust pipeline caused by the fact that LNG liquid directly enters the exhaust pipeline does not occur.
Claims (7)
1. A liquefied natural gas low-temperature pump well exhaust system comprises a liquid level detector arranged in a low-temperature storage tank, an exhaust pipeline connected with a pump well in the low-temperature storage tank, and an external transmission pipeline connected with the pump well in the low-temperature storage tank, wherein a low-temperature tank internal pump is arranged at the bottom of the pump well, an exhaust control valve is arranged in the exhaust pipeline, a liquid discharge control valve is arranged in the external transmission pipeline, the liquid level detector, the exhaust control valve and the low-temperature tank internal pump are respectively connected with a control unit, and the control unit can control the opening and closing of the exhaust control valve according to the liquid level detected by the liquid level detector, so that the exhaust time is controlled;
the control unit controls the exhaust control valve and the exhaust control valve to be opened and closed according to the liquid level detected by the liquid level detector and the working parameters of the pump in the low-temperature tank, so that the exhaust time is accurately controlled.
2. The lng cryogenic pump well exhaust system of claim 1, wherein the level detector is a microwave radar level detector or a float level detector.
3. The lng cryogenic pump well venting system of claim 1, wherein the vent line is positioned above an export line for liquid discharge.
4. The lng cryogenic pump well venting system of claim 1, wherein the control unit is a programmable controller or a distributed control system.
5. A method of controlling lng cryogenic pump well venting, comprising the steps of:
1) acquiring pump well gas phase height H1 through a liquid level detector:
H1=H-L，
h is the design height of the pump well, and L is the in-tank liquid level value measured by the liquid level detector;
2) calculating the effective discharge volume V2 of the pump well, and calculating the formula V2 ═ P1 (H1 ×. 3.14 ×. D) 2 /4)/P2，
Wherein P1 is the normal operating pressure of gas in the pump well, H1 is the result obtained in the step 1), D is the designed diameter of the pump well, and P2 is the normal working pressure of the pump in the low-temperature tank arranged at the bottom of the pump well after the pump is started;
3) calculating the exhaust time T, calculating the formula T = V2/(K × Q),
wherein V2 is the calculation result obtained in the step 2), Q is the rated working flow of the pump in the cryogenic tank, the rated working flow is obtained from the working curve of the pump, K is the flow coefficient, and the flow coefficient of the pump in T time is obtained;
4) according to the exhaust time T obtained in the step 3), the control unit opens the exhaust control valve and closes the exhaust control valve at the same time to exhaust; after the exhaust time T, the control unit closes the exhaust control valve and simultaneously opens the drain control valve.
6. The method according to claim 5, wherein in the step 4), the pump in the low-temperature tank is started, and the control unit controls to open the exhaust control valve and close the exhaust control valve to exhaust; after the exhaust time T, the control unit controls to close the exhaust control valve and simultaneously opens the exhaust control valve, and the pump in the low-temperature tank outputs liquid outwards.
7. A method according to claim 5 or 6, wherein the meter is a master meterIn the calculating step, the unit of the design height H of the pump well, the level value L in the tank measured by the liquid level detector, the gas phase height H1 of the pump well and the design diameter D of the pump well is meter (m); the normal operating pressure of the gas in the pump well, P1, and the normal operating pressure after the pump is started, P2, are both in units of MPa (megapascals); the effective pump well displacement volume V2 has a unit of cubic meters (m) 3 ) (ii) a Rated operating flow rate Q of the pump is given in m 3 /h。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710319857.3A CN106969260B (en) | 2017-05-09 | 2017-05-09 | Liquefied natural gas low-temperature pump well exhaust system and control method |
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| CN201710319857.3A CN106969260B (en) | 2017-05-09 | 2017-05-09 | Liquefied natural gas low-temperature pump well exhaust system and control method |
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| CN106969260B true CN106969260B (en) | 2022-09-16 |
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| CN109882731B (en) * | 2019-03-28 | 2024-04-30 | 中海石油气电集团有限责任公司 | Storage tank for reducing LNG liquid level |
| CN112984368A (en) * | 2019-12-16 | 2021-06-18 | 南京扬子石油化工设计工程有限责任公司 | Low-temperature full-capacity tank for realizing low-liquid-level material extraction function by utilizing pump column |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6372999A (en) * | 1986-09-12 | 1988-04-02 | Nkk Corp | Transport method for air-liquid mixture |
| JPH03134400A (en) * | 1989-10-18 | 1991-06-07 | Ishikawajima Harima Heavy Ind Co Ltd | Bog take-out method and device in lng tank |
| JPH08135897A (en) * | 1994-11-11 | 1996-05-31 | Jeol Ltd | Cryogenic liquid transfer device |
| JP2951954B1 (en) * | 1998-09-17 | 1999-09-20 | ムサシノ機器株式会社 | Barometric level gauge |
| JP2000130693A (en) * | 1998-10-26 | 2000-05-12 | Ishikawajima Harima Heavy Ind Co Ltd | Cryogenic storage facility |
| CN201836643U (en) * | 2010-09-03 | 2011-05-18 | 中国海洋石油总公司 | Pump well device in liquefied petroleum gas tank |
| CN102213361B (en) * | 2011-05-30 | 2012-11-14 | 中国寰球工程公司 | Liquid ethylene storage tank, liquid ethylene storage and gasification system and liquid ethylene gasification method |
| KR102044264B1 (en) * | 2012-12-31 | 2019-11-14 | 대우조선해양 주식회사 | Suction pot level control apparatus of high pressure pump for vessel and method for operating the apparatus |
| CN204300688U (en) * | 2014-10-29 | 2015-04-29 | 郑州朗润石油设备有限公司 | LNG immersed pump pump pit level control system |
| CN206973262U (en) * | 2017-05-09 | 2018-02-06 | 新地能源工程技术有限公司 | A kind of LNG cold pump sump gas extraction system |
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