CN105864639B - A kind of pipeline pressure-stabilizing system and method after liquefied petroleum gas multi-purpose station pipeline stopping transportation - Google Patents
A kind of pipeline pressure-stabilizing system and method after liquefied petroleum gas multi-purpose station pipeline stopping transportation Download PDFInfo
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- CN105864639B CN105864639B CN201610208313.5A CN201610208313A CN105864639B CN 105864639 B CN105864639 B CN 105864639B CN 201610208313 A CN201610208313 A CN 201610208313A CN 105864639 B CN105864639 B CN 105864639B
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
Abstract
The invention discloses the pipeline pressure-stabilizing system and method after a kind of liquefied petroleum gas multi-purpose station pipeline stopping transportation, system includes the temperature sensor and pressure sensor being arranged on supervisor's pipe nipple and the level-one stable-pressure device being connect with supervisor's pipe nipple and two level stable-pressure device；The level-one stable-pressure device includes the first block valve, shut-off valve, the pressure surge tank that are connect successively with supervisor's pipe nipple；The second block valve is provided between level-one stable-pressure device and two level stable-pressure device；The two level stable-pressure device includes the third block valve, pressure buffer, pressure-regulating device and the liquefied petroleum gas storage tank that are connect successively with supervisor's pipe nipple.LNG temperature testing result when the present invention is by stopping transportation is compared with ground temperature, manifold pressure changes after calculating some time, and according to analysis result, it is pipeline ftercompction using level-one stable-pressure device, or it is pipeline pressure release to utilize level-one stable-pressure device and two level stable-pressure device, to realize, pipeline pressure is stablized after stopping transportation, and safeguards system safety avoids all fronts pigging, emptying.
Description
Technical field
The present invention relates to the pipeline pressure-stabilizing system and methods after a kind of liquefied petroleum gas multi-purpose station pipeline stopping transportation.
Background technology
In recent years, with oil exploitation and the fast development of petroleum chemical industry, liquefied petroleum gas is due to octane number
High, the features such as capability of antidetonance is good, calorific value is high, production and using being increasingly improved.Lpg pipeline conveying is through a large amount of
Techical and economic assessments and scientific research, greatly developed.Since the density of liquefied petroleum gas is lighter than water in liquid phase, in gas compared to sky
Gas weight, and with extremely strong volatility, once pipe leakage occurs, liquid-phase vaporization, air accumulation necessarily occurs, easily causes great
Accident.
In traditional liquid pipe conveying, extreme pressure is the most serious with working condition of water hammer, is often set before the block valve of downstream
Water attack bleeder, but tank of releasing, the attached great expense such as artificial are increased simultaneously.Lpg pipeline flow velocity is relatively
Low, surge pressure is relatively small, and the equivalent stress of manufacture can not consider peripheral hardware pressure relief equipment often less than pipeline working strength
Water attack decompression protection is carried out, the extreme pressure protection requirement of routine operation can be met.However, liquefied petroleum gas has extremely strong heat
Dilatancy and cold events, by taking certain component liquefaction oil gas as an example, at -10 DEG C, pressure medium is 3MPa in closed conduit；But
After being warming up to 0 DEG C, in isometric pipeline space, pressure medium increases sharply to 11MPa.In cold district, liquefied petroleum gas initial station is stored up
Tank does not take Insulation to reduce saturated vapor pressure, therefore medium temperature is close to atmospheric temperature in tank, and the pipe of buried conveying
Road is located under frozen soil layer, and ground temperature is most probably higher than atmospheric temperature.Therefore, in winter during stopping transportation, accumulate in multi-purpose station pipeline
Liquefied petroleum gas will be influenced by ground temperature, and be expanded, and pipeline pressure is caused to increase severely.Similarly, after the cooling of summer stopping transportation, pipeline
It is interior will occur substantially to cool down due to dielectric shrink, liquid-phase vaporization the problems such as.Although start pigging after stopping transportation or downstream tank car is taken out
The above problem can be alleviated by the technologies such as inhaling, but bring that pigging power resources are difficult, the more difficult foundation of back pressure system, pipe when going into operation again
The problems such as phase transformation and hidden danger after medium decompression in road, will also expend a large amount of manpower and materials.
Invention content
The shortcomings that in order to overcome the prior art, the present invention provides the pipelines after a kind of liquefied petroleum gas multi-purpose station pipeline stopping transportation
Voltage-stabilizing system and method, to ensure that the lpg pipeline pressure after stopping transportation is in safe range, and can quickly reproduce.
The technical solution adopted in the present invention is：A kind of pipeline pressure-stabilizing system after liquefied petroleum gas multi-purpose station pipeline stopping transportation,
Including the temperature sensor and pressure sensor being arranged on supervisor's pipe nipple and the level-one stable-pressure device being connect with supervisor's pipe nipple
With two level stable-pressure device；The level-one stable-pressure device includes the first block valve, shut-off valve, pressure being connect successively with supervisor's pipe nipple
Surge tank；The second block valve is provided between level-one stable-pressure device and two level stable-pressure device；The two level stable-pressure device includes
Third block valve, pressure buffer, pressure-regulating device and the liquefied petroleum gas storage tank being connect successively with supervisor's pipe nipple.
The invention also discloses a kind of pipeline pressure-stabilizing method after liquefied petroleum gas multi-purpose station pipeline stopping transportation, including walking as follows
Suddenly：
Step 1: certain moment is truncated pipeline internal medium pressure after calculating stopping transportation；
Step 2: judge the pressure height of the pressure medium calculated and pressure transmitter measurement on supervisor's pipe nipple：If
Pressure is calculated higher than measurement pressure, then it represents that thermal expansion will occur for medium, enter step four；If it calculates pressure to press less than measurement
Power, then it represents that cold events will occur for medium, enter step three；
Step 3: in the case where ensuring that all block valves are closed, the pressure surge tank injection to level-one stable-pressure device is lazy
Property gas or water, the pressure of pressure surge tank is made to be not less than the minimum permission pressure of pipeline；When pressure reduction in closed conduit, open
The first block valve and quick opening stop valve are opened, from pressure surge tank to closed conduit system punching press；
Step 4: after pressure is more than default maximum pressure in closed conduit, the second block valve and third block valve are opened；
When pressure increases and again after more than default maximum pressure in closed conduit, quick the 4th block valve of unlatching/closing, in metering hole
Under the action of plate and pressure release branch pipe back pressure, after liquefied petroleum gas releases partial pressure, liquefied petroleum gas storage tank is flowed into.
Compared with prior art, the positive effect of the present invention is：The present invention is by liquefied natural gas pressure, the temperature after stopping transportation
Testing result is compared with ground temperature, and manifold pressure changes after analyzing some time, and according to analysis result, is filled using level-one voltage stabilizing
It is pipeline pressure release to be set to pipeline ftercompction or utilize level-one stable-pressure device and two level stable-pressure device, to realize pipeline pressure after stopping transportation
Stablize.The present invention is suitable for defeated system outside liquefied petroleum gas, and medium is by ground temperature after not only eliminating lpg pipeline stopping transportation
It influences that volume change occurs and generates the influence to pipeline strength, also avoids all fronts pigging emptying, restarts and establish back pressure, be situated between
Matter release generate low temperature the problems such as, reached safe and environment-friendly, energy-efficient effect.Specific manifestation is as follows：
(1) pressure security：Level-one stable-pressure device and two level stable-pressure device, which provide superpressure liquefied petroleum gas in pipeline, to be let out
Pressure approach, by special control unit and instrument, setting and the pressure of control liquefied petroleum gas ensure in any case, pipe
The liquefied petroleum atmospheric pressure accumulated in road is less than the safe pressure reference value of system setting.
(2) protection is appropriate：The level-one stable-pressure device of setting is the pressure release approach of liquefied petroleum gas under small expansion status, is both dropped
Low system pressure, by the liquefied petroleum gas injected system in pressure surge tank again, can also improve after system temperature reduction
System pressure；The two level stable-pressure device that the present invention is set is the pressure release approach of liquefied petroleum gas under big expansion status, when system drops
Discharge rate needed for pressure starts when being more than level-one stable-pressure device receiving ability, further systems stabilisation pressure.
(3) safety is good：Under the premise of lpg pipeline system pressure safety is ensured, by the medium for discharge of releasing
Closed pressure surge tank or liquefied petroleum gas storage tank are delivered to, almost zero-emission effectively prevents liquefied petroleum gas and air
The possibility of contact.
(4) property is saved：Liquid phase is carried out to superpressure partial liquefaction oil gas to release, avoid complete using pressure controling means
Searching pigging needed for line pigging pushes air source, re-establishes the problems such as back pressure, saves a large amount of human and material resources.
(5) low temperature is avoided：In the pipeline protected without the present invention, once system pressure increases, then it can only be risen using pipeline
Bleed-off system before and after initial point block valve carries out pressure release to liquefied petroleum gas, if ducts upstream can not provide gas ftercompction, manages
Medium will be vaporized with pressure reduction in road, and temperature is caused to be greatly reduced, and grave danger is generated to tube performance.The present invention
Medium in pipe-line system can be stabilized to liquid phase, avoid undergoing phase transition.
Description of the drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein：
Schematic diagrames of the Fig. 1 for the pipeline pressure-stabilizing system after the liquefied petroleum gas multi-purpose station pipeline stopping transportation of the present invention.
Specific embodiment
A kind of pipeline pressure-stabilizing system after liquefied petroleum gas multi-purpose station pipeline stopping transportation, as shown in Figure 1, including：Supervisor's pipe nipple 1,
First pressure transmitter 2, temperature transmitter 3, second pressure transmitter 4, gas injection valve group 5, drain valve group 6, pressure surge tank 7,
It is vented valve group 8, branch pipe 9 of releasing, purging leakage fluid dram 10, shut-off valve 11, the first block valve 12, connection branch pipe 13, the second block valve
14th, third pressure transmitter 15, third block valve 16, the 4th block valve 17, restriction orifice 18, blow valve port 19, the 4th pressure become
Device 20, built liquefied petroleum gas storage tank 22 and pressure buffer 23 etc. are sent, wherein：
Second pressure transmitter 4, gas injection valve group 5, drain valve group 6, pressure surge tank 7, exhaust valve group 8, branch pipe 9 of releasing,
Purge leakage fluid dram 10, shut-off valve 11, the first block valve 12 composition level-one stable-pressure device A；The level-one stable-pressure device is variable capacity
Product formula stable-pressure device；The pressure surge tank right angle setting, top are inert gas storage space, and lower part is empty for liquid phase buffer
Between, air-liquid reservoir volume ratio is controlled by top pressure control valve；The pressure buffer tank top installation pressure sensor, gas injection
Mouth, exhaust outlet, bottom installation liquefied petroleum gas branch pipe connector and leakage fluid dram；The pressure surge tank has re-injection liquefied petroleum
Gas enters the function of supervisor's pipe nipple 1.
Second block valve 14, third block valve 16, the 4th block valve 17, restriction orifice 18, is blown third pressure transmitter 15
Sweep the composition two level stable-pressure device such as mouth 19, the 4th pressure transmitter 20, built liquefied petroleum gas storage tank 22, pressure buffer 23 B.
The two level stable-pressure device for can releasing type stable-pressure device, the built liquefied petroleum gas storage tank of downstream connection；4th block valve
17 and restriction orifice 18 form pressure-regulating device, can be pressure-regulating valve or ball valve+restriction orifice combination, be opened by high frequency
Actuator action is closed, precisely to adjust pressure medium in supervisor's pipe nipple；The conventional pressure of the front and rear installation of the pressure-regulating device
Power surge tank (built liquefied petroleum gas storage tank 22 and pressure buffer 23), to reduce loine pressure fluctuation；The pressure is adjusted
The branch pipe 21 connected with the pressure surge tank inlet duct after device is set, is isolated by the 4th block valve 17.
In shown system, supervisor's pipe nipple 1 is horizontally mounted, and is weldingly connected with upstream and downstream main pipeline.It is described supervisor pipe nipple 1 be
The steel pipe consistent with multi-purpose station pipeline caliber, material.It is responsible on pipe nipple 1 and first pressure transmitter 2 and temperature is installed successively from left to right
Transmitter 3 is spent, to test and upload the pressure and temperature of medium in supervisor's main line 1.Level-one stable-pressure device A and two level stable-pressure device
B is picked out from supervisor's pipe nipple 1.
Supervisor's pipe nipple 1 and level-one stable-pressure device A has been isolated in first block valve 12, and in normal work, the valve is to close
's.Motor drive mechanism control and execution may be selected in shut-off valve 11, it is desirable that and it is rapidly opened and closed, to realize main line closed system to level-one voltage stabilizing
Pressure surge tank 7 in device carries out micro drain, pressure release.Purging leakage fluid dram 10 is provided on branch pipe 9 releasing, is examined for equipment
It repaiies and line clear.Pressure surge tank 7 is steel, vertical storage tank, and design pressure must not be less than supervisor's pipe nipple 1, be stored up for receiving
Deposit the liquefied petroleum gas released after expanded by heating in supervisor's pipe nipple 1 and stopping transportation main line.7 top of pressure surge tank is equipped with gas injection valve group
5, it boosts for pressure surge tank 7, to provide the back pressure of releasing of liquefied petroleum gas；Top is equipped with exhaust valve group 8, for the stone that liquefies
After oil gas enters pressure surge tank 7, after showing pressure rise by second pressure transmitter 4, gas phase of suitably releasing, to reduce tank
Interior pressure；Bottom is equipped with drain valve group 6, for sampling with pressure or maintenance drain.
Connection branch line 13 has connected level-one stable-pressure device A and two level stable-pressure device B with the second block valve 14, connects on branch line
There is provided third pressure transmitters 15.Meanwhile two level stable-pressure device is drawn on supervisor's pipe nipple 1, is isolated by third block valve 16.
4th block valve 17 may be selected to be electric operator control and execution, cooperation restriction orifice 18 carry out liquefied petroleum gas release and
Decompression.To reduce the upstream pressure cyclic fluctuation released and generated in the process, 17 upstream of the 4th block valve is provided with pressure buffer
Device 23.Blow valve port 19 is used to the liquefied petroleum gas remained on after most of pressure release in main pipe of releasing being pushed into built liquefaction stone
Oil gas storage tank 22.
Level-one stable-pressure device and two level stable-pressure device are switched by logic control element, the logic control system setting pipe
Road safe pressure is reference value, supervisor's pipe nipple, the level-one stable-pressure device pressure, the two level stable-pressure device described in collection analysis
Pressure, and with after reference safety value comparison, controlled valve signal being sent to the block valve for connecting stable-pressure device, to control total system
Pressure is close to setting with reference to safety value.
The method that pipeline pressure-stabilizing is carried out using above-mentioned pipeline pressure-stabilizing system, is included the following steps：
Step 1：The lpg pipeline stopping transportation of normal operation, pipeline upstream and downstream block valve are closed.After stopping transportation in pipeline
Temperature, the pressure of closed liquefied petroleum gas are detected, while by thermometric, the pressure instrumentataion on supervisor by comparing Near Pipelines ground temperature
Parameter, after judging the stopping transportation some time, pressure trend in closed conduit：
3 parameter of first pressure transmitter 2 and temperature transmitter on supervisor's pipe nipple 1 is obtained, with reference to neighbouring buried pipeline ground temperature
Parameter, with the principle for keeping molal volume constant, after calculating and assessing stopping transportation certain moment be truncated pipeline internal medium pressure.
Step 2：If calculate pressure measures pressure higher than first pressure transmitter 2, then it represents that thermal expansion will occur for medium,
Enter step four；If calculating the measurement pressure that pressure is less than first pressure transmitter 2, then it represents that cold events will occur for medium, into
Enter step 3；
Step 3：For the pipeline with medium temperature downward trend, prefilled inert gas or liquefied petroleum natural gas
To the pressure surge tank of level-one stable-pressure device, and it is pipeline ftercompction, that is, starts level-one after pressure medium reduction in closed conduit
Stable-pressure device A carries out filling voltage stabilizing：
Under cold events operating mode, ensure that all block valves are closed first, allow pressure (according to prediction according to pipeline is minimum
Pressure trend is chosen), inert gas is injected to pressure surge tank 7 using valve group 5 is injected, makes second pressure transmitter 4
Pressure value is not less than the minimum permission pressure of pipeline.When pressure reduction in closed conduit, open the first block valve 12 and quickly open
Shut-off valve 11 is opened, from pressure surge tank 7 to closed conduit system punching press.Permit when pressure is minimum less than pipeline in pressure surge tank 7
Perhaps after pressure, the first block valve 12 and shut-off valve 11 is closed, is again 7 punching press of pressure surge tank.It is reciprocal with this.
Step 4：For the pipeline with medium temperature ascendant trend, level-one stable-pressure device A and (or) two level voltage stabilizing are utilized
Device B carries out voltage stabilizing of releasing to the medium that boosts in closed conduit：When the i.e. required amount of releasing is smaller, preferably enters level-one voltage stabilizing and fill
It puts, when the required amount of releasing is excessive, opens two level stable-pressure device；Also two can be directly initiated after the excessive amount of releasing is pre-estimated
Grade stable-pressure device：
(1) under thermal expansion operating mode, all block valves are first shut off, according to pipeline maximum working pressure (according to prediction
Pressure trend is chosen), inert gas injection rate in pressure surge tank 7 is adjusted, the pressure for detecting second pressure transmitter 4
The pressure value of surge tank 7 is not higher than the minimum permission pressure of pipeline.Stopping transportation, medium are close under normal operation for LNG pipeline
It closes between the block valve out of the station of yard.When cryogenic media is influenced by ground temperature, after temperature raising, enclosed system pressure increases,
Temperature transmitter 3 and first pressure sensor 2 detect and upload respectively real-time parameter.It is detected when first pressure sensor 2
After system pressure value is more than default maximum pressure, the first block valve 12 of pressure release branch pipe 9 is opened, certain media is packed into shut-off valve
11st, in the pipeline between the first block valve 12 and the second block valve 14, system pressure is declined.From gas injection valve group 5 to pressure
Inert gas is filled in surge tank, injection rate is controlled by pressure transmitter 4, to provide back pressure after the valve of shut-off valve 11.Work as temperature
After the system pressure value that first pressure sensor 2 detects increases and is more than default maximum pressure again, opening stop valve 11, by
Motor drive mechanism controls, and 11 quick unlatching/closing of shut-off valve is released with remaining micro, and liquefied natural gas enters through pressure release branch pipe 9 presses
Power surge tank 7 makes gas phase in pressure surge tank 7 compressed, and 4 show value of pressure transmitter rises, when pressure in pressure buffer 7
After highest setting pressure, buffer entries are blocked, open exhaust valve group 8 to 7 pressure release of pressure surge tank, gas of slowly releasing
Phase, to reduce the pressure of supervisor's pipe nipple 1 and level-one stable-pressure device A.And so on, until being vented 8 final vacuum temperature decrease of valve group,
Show to have accumulated full liquefied petroleum gas in pressure surge tank 7.More liquefied petroleum gas need to carry out by two level stable-pressure device B
It releases.
(2) after the pressure surge tank 7 in level-one stable-pressure device A is full of liquefied petroleum gas, 14 He of the second block valve is opened
Third block valve 16, liquefied petroleum gas fill up the section of tubing between block valve, system pressure (3 detected value of temperature transmitter) meeting
Declined.After system pressure (3 detected value of temperature transmitter) increases again and is more than default maximum pressure, the 4th section is opened
Disconnected valve 17 at this time under the action of 21 back pressure of restriction orifice 18 and pressure release branch pipe, after liquefied petroleum gas releases partial pressure, flows into
Built liquefied petroleum gas storage tank 22.Due to built liquefied petroleum gas storage tank 22 by outer gas injection body maintenance pressure inside the tank more than saturation
Vapour pressure, therefore the back pressure in branch pipe 21 of releasing can guarantee that the liquefied petroleum gas after the throttling of restriction orifice 18 is in liquid phase.Due to
System pressure and built liquefied petroleum gas storage tank 22 are there are pressure difference, therefore the 4th block valve 17 is high-speed switch control, to remain micro-
Amount is released.After releasing, if third pressure transmitter 15 detects pressure again higher than secure setting, the 4th block valve 17 is again
It opens.So repeatedly, to reach control supervisor's pipe nipple pressure, the purpose of stopping transportation lpg pipeline safety is protected.Work as third
After the detection of pressure transmitter 15 pressure does not change at any time, show that enclosed system pressure is stable, close first and block
Valve 12 and third block valve 16, purge pressure stabilizing system pipeline.
The present invention operation principle and the course of work be：
(1) stopping transportation, medium are sealed between the block valve out of the station of yard LNG pipeline under normal operation.
When cryogenic media is influenced by ground temperature, after temperature raising, enclosed system pressure increases, and temperature sensor and pressure sensor are examined respectively
Survey and upload real-time parameter.After system pressure (3 detected value of temperature transmitter) is more than default maximum pressure, pressure release branch pipe is opened
9 block valve 12, certain media are packed into the pipeline between shut-off valve 11, block valve 12 and block valve 14, and system pressure has
Declined.Inert gas is filled into pressure surge tank from gas injection valve group 5, injection rate is controlled by pressure transmitter 4, to provide
Back pressure after the valve of shut-off valve 11.After system pressure (3 detected value of temperature transmitter) increases again, and more than default maximum pressure
Afterwards, opening stop valve 11 are controlled by motor drive mechanism, and 11 quick unlatching/closing of shut-off valve is released with remaining micro.When liquefaction day
After right gas charged pressure surge tank 7, gas phase is compressed in tank, and 4 show value of pressure transmitter rises, and opens exhaust valve group 8, slowly
It releases gas phase, to reduce the pressure of supervisor's pipe nipple 1 and level-one stable-pressure device A.And so on, until exhaust 8 heel row temperature of valve group
Rapid drawdown is spent, shows to have accumulated full liquefied petroleum gas in pressure surge tank 7.More liquefied petroleum gas need to fill by two level voltage stabilizing
B is put to release.
(2) it after the pressure surge tank 7 in level-one stable-pressure device A is full of liquefied petroleum gas, opens block valve 14 and blocks
Valve 16, liquefied petroleum gas fills up the section of tubing between block valve, under system pressure (3 detected value of temperature transmitter) meeting
Drop.When system pressure (3 detected value of temperature transmitter) increases again, and more than default maximum pressure after, open block valve 17, this
When under the action of 21 back pressure of restriction orifice 18 and pressure release branch pipe, after liquefied petroleum gas releases partial pressure, flow into built liquefaction
Petroleum gas storage tank 22.Due to built liquefied petroleum gas storage tank 22 by outer gas injection body maintain pressure inside the tank be more than saturated vapour pressure,
Therefore the back pressure in branch pipe 21 of releasing can guarantee that the liquefied petroleum gas after the throttling of restriction orifice 18 is in liquid phase.Due to system pressure
With built liquefied petroleum gas storage tank 22 there are pressure difference, therefore block valve 17 is controlled for high-speed switch, is released with remaining micro.It releases
Afterwards, if pressure transmitter 15 detects pressure again higher than secure setting, block valve 17 is again turned on.So repeatedly, to reach
Pipe nipple pressure is responsible for control, protects the purpose of stopping transportation lpg pipeline safety.
(3) if in addition, level-one stable-pressure device A can be in the case of not canful, maintenance system pressure is constant, if i other words
Closed liquefied petroleum gas heating is smaller in system, causes expansion smaller, then pressure surge tank 7 can accommodate the liquid released after expansion
Liquefied oil gas then after the decline of later stage ground temperature, is pushed into inert gas using gas injection valve group, increases the pressure of pressure surge tank 7, will
Liquefied petroleum gas refills closed conduit, after making up cooling, since the contraction of liquefied petroleum gas volume causes in closed conduit
Pressure reduction.
(4) after system restores conveying, the pipeline of stable-pressure device can be purged by blow valve port 10 and blow valve port 19, and
Inert gas is injected, for use next time.
Claims (8)
1. a kind of pipeline pressure-stabilizing system after liquefied petroleum gas multi-purpose station pipeline stopping transportation, it is characterised in that：It is short including being arranged on supervisor
Temperature sensor and pressure sensor on section and the level-one stable-pressure device being connect with supervisor's pipe nipple and two level stable-pressure device；
The level-one stable-pressure device includes the first block valve, shut-off valve, the pressure surge tank that are connect successively with supervisor's pipe nipple；The level-one
Stable-pressure device is variable displacement stable-pressure device；Pressure transmitter, note are provided on the pressure surge tank of level-one stable-pressure device
Air valve group, drain valve group, exhaust valve group；The second block valve is provided between level-one stable-pressure device and two level stable-pressure device；Institute
It states two level stable-pressure device and includes the third block valve, pressure buffer, pressure-regulating device and the liquid that are connect successively with supervisor's pipe nipple
Liquefied oil gas storage tank, wherein, the pressure-regulating device includes the 4th block valve and restriction orifice.
2. the pipeline pressure-stabilizing system after a kind of liquefied petroleum gas multi-purpose station pipeline stopping transportation according to claim 1, feature exist
In：Purging leakage fluid dram is provided between shut-off valve on the pressure surge tank of level-one stable-pressure device.
3. the pipeline pressure-stabilizing system after a kind of liquefied petroleum gas multi-purpose station pipeline stopping transportation according to claim 1, feature exist
In：Blow valve port is provided between the pressure-regulating device and liquefied petroleum gas storage tank of two level stable-pressure device.
4. the pipeline pressure-stabilizing system after a kind of liquefied petroleum gas multi-purpose station pipeline stopping transportation according to claim 1, feature exist
In：The pressure surge tank right angle setting of the level-one stable-pressure device, top are inert gas storage space, and lower part is liquid phase buffer
Space.
5. a kind of pipeline pressure-stabilizing of pipeline pressure-stabilizing system using after liquefied petroleum gas multi-purpose station pipeline stopping transportation described in claim 1
Method, it is characterised in that：Include the following steps：
Step 1: certain moment is truncated pipeline internal medium pressure after calculating stopping transportation；
Step 2: judge the pressure height of the pressure medium calculated and pressure transmitter measurement on supervisor's pipe nipple：If it calculates
Pressure is higher than measurement pressure, then it represents that thermal expansion will occur for medium, enter step four；Pressure is measured if calculating pressure and being less than,
It then represents that cold events will occur for medium, enters step three；
Step 3: in the case where ensuring that all block valves are closed, indifferent gas is injected to the pressure surge tank of level-one stable-pressure device
Body makes the pressure of pressure surge tank be not less than the minimum permission pressure of pipeline；When pressure reduction in closed conduit, first section is opened
Disconnected valve and quick opening stop valve, from pressure surge tank to closed conduit system punching press；
Step 4: after pressure is more than default maximum pressure in closed conduit, the second block valve and third block valve are opened；When close
Close manifold pressure increase again and more than default maximum pressure after, quick the 4th block valve of unlatching/closing, in restriction orifice and
Under the action of pressure release branch pipe back pressure, after liquefied petroleum gas releases partial pressure, liquefied petroleum gas storage tank is flowed into.
6. the pipeline pressure-stabilizing method after a kind of liquefied petroleum gas multi-purpose station pipeline stopping transportation according to claim 5, feature exist
In：During described in step 3 from pressure surge tank to closed conduit system punching press, when pressure buffer pressure inside the tank is less than
After the minimum permission pressure of pipeline, the first block valve and shut-off valve are closed, is again pressure surge tank punching press.
7. the pipeline pressure-stabilizing method after a kind of liquefied petroleum gas multi-purpose station pipeline stopping transportation according to claim 5, feature exist
In：Before step 4 opens the second block valve and third block valve, all block valves are first closed, adjust inertia in pressure surge tank
Gas injection rate makes the pressure of the pressure surge tank of level-one stable-pressure device be not higher than the minimum permission pressure of pipeline；Work as closed conduit
After interior pressure increases and is more than default maximum pressure, the first block valve is opened；When pressure is increased and is more than again in closed conduit
After default maximum pressure, quick unlatching/closing shut-off valve makes liquefied natural gas enter pressure surge tank；When in pressure buffer
After pressure is higher than highest setting pressure, buffer entries are blocked, open exhaust valve group to pressure surge tank pressure release, and so on,
Until exhaust valve group final vacuum temperature decrease.
8. the pipeline pressure-stabilizing method after a kind of liquefied petroleum gas multi-purpose station pipeline stopping transportation according to claim 5, feature exist
In：In step 4, after pressure does not change at any time in closed conduit, the first block valve and third block valve are closed,
Pressure stabilizing system pipeline is purged.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610208313.5A CN105864639B (en) | 2016-04-05 | 2016-04-05 | A kind of pipeline pressure-stabilizing system and method after liquefied petroleum gas multi-purpose station pipeline stopping transportation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610208313.5A CN105864639B (en) | 2016-04-05 | 2016-04-05 | A kind of pipeline pressure-stabilizing system and method after liquefied petroleum gas multi-purpose station pipeline stopping transportation |
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| Publication Number | Publication Date |
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| CN105864639A CN105864639A (en) | 2016-08-17 |
| CN105864639B true CN105864639B (en) | 2018-07-06 |
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| CN106759779B (en) * | 2017-03-29 | 2019-01-29 | 中国石油天然气集团公司 | A kind of online blowdown apparatus and online method for discharging pollution applied to gas pipeline yard |
| CN107472912B (en) * | 2017-08-14 | 2018-11-13 | 苏州中远物流有限公司 | A kind of filling material pressure-flow system |
| CN107388036A (en) * | 2017-08-30 | 2017-11-24 | 湖南申鑫能源科技有限公司 | Energy conserving system and its application process based on compressed natural gas |
| CN108286650A (en) * | 2017-12-29 | 2018-07-17 | 长春汽四环腾达油脂化工有限公司 | One kind filling ammonia method |
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| CN109357163B (en) * | 2018-11-23 | 2023-10-03 | 中国石油工程建设有限公司 | System and method for stopping and restarting gaseous ethane pipeline |
| CN109915731B (en) * | 2019-04-02 | 2024-01-26 | 中国石油工程建设有限公司 | Pressure protection system and method for large-drop liquefied petroleum gas pipeline |
| CN111578149B (en) * | 2020-05-25 | 2022-07-26 | 重庆西美仪器仪表有限公司 | Gas pipeline leakage monitoring method, device and system and storage medium |
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| US6953045B2 (en) * | 2002-04-10 | 2005-10-11 | Neil Enerson | Gas delivery system |
| CN101280887B (en) * | 2007-06-06 | 2012-01-11 | 中国人民解放军总后勤部军需装备研究所 | Pipe gas pressure stabilizing regulation system |
| CN103104811B (en) * | 2013-01-16 | 2015-11-18 | 东莞新奥燃气有限公司 | A kind of pressure regulation air supply method of gas distributing system |
| CN204187281U (en) * | 2014-10-29 | 2015-03-04 | 刘复合 | A kind of pressure relief system for high-pressure gas long distance pipeline |
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