CN108342218A - A kind of petroleum substance automatic dehydration system - Google Patents
A kind of petroleum substance automatic dehydration system Download PDFInfo
- Publication number
- CN108342218A CN108342218A CN201810056090.4A CN201810056090A CN108342218A CN 108342218 A CN108342218 A CN 108342218A CN 201810056090 A CN201810056090 A CN 201810056090A CN 108342218 A CN108342218 A CN 108342218A
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- Prior art keywords
- pressure difference
- petroleum substance
- water
- oil
- pressure
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Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G33/00—Dewatering or demulsification of hydrocarbon oils
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/10—Feedstock materials
- C10G2300/1033—Oil well production fluids
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/20—Characteristics of the feedstock or the products
- C10G2300/201—Impurities
- C10G2300/202—Heteroatoms content, i.e. S, N, O, P
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Liquids With Adsorbents In General (AREA)
Abstract
The invention belongs to technical field of petrochemical industry, more particularly to a kind of petroleum substance automatic dehydration system.The petroleum substance automatic dehydration system of the present invention includes pressure difference transmitter, turbulent-flow-prevention baffle, automatic water-removing valve and support water pipe；Wherein the pressure difference transmitter is arranged in petroleum substance storage tank lower part, with upper and lower two pressures point, interference guard flow-stopping plate is set near the lower pressure point of pressure difference transmitter, in petroleum substance tank bottom, automatic water-removing valve is set, it uniformly arranges in petroleum substance tank inside far from lower pressure point, dehydrating tube dehydrated mouth position.Present device is simple, and operation is easy to maintenance, is converted to from density contrast more rambunctious control and is easier to controlled pressure difference control, to solve the problems, such as the larger petroleum substance automatic dehydration of density.
Description
Technical field
The invention belongs to technical field of petrochemical industry, more particularly to a kind of petroleum substance automatic dehydration system.
Background technology
There are many existing petroleum-type storage tank dewatering, but most is all to realize grease point using the density contrast of petroleum-type and water
From.
As Chinese patent CN201710230716.4 discloses a kind of crude oil dehydration energy saving emission abatement device and technique, technology
Scheme includes Water Tank, two phase separator, compressor, working medium cooler, crude setting tank, working medium condenser, pump, three phase separation
The import of device, low boiling working medium evaporator, the three phase separator connects crude oil and carrys out liquid pipe, and outlet at bottom connects low boiling by pipeline
The output end of working medium evaporator, low boiling working medium evaporator is connected to Water Tank, the top of two phase separator by two phase separator
The low boiling heating working substance steam isolated is sucked by compressor, and the output end of compressor connects working medium cooler, working medium cooler
Output end connect working medium condenser, the output end of working medium condenser is connected to the top of low boiling working medium evaporator.
Such as a kind of visual crude dehydrating plants of Chinese patent CN201710142650.3 and dewatering, device includes ventilation
System and dehydrator, the dehydrator include thermal dehydration system, condensing reflux system and spraying-preventing system, the thermal dehydration system
System is by globe valve, flange, glass dehydrator, tetrafluoroethene upper cover, sample filler, temperature sensor and helical heating pipe group
At the temperature sensor is connected with helical heating pipe and is arranged inside glass dehydrator；The condensing reflux system by
Condense receiver, connecting clamp, silica gel sealing ring and the double-deck serpentine condenser composition；The bilayer serpentine condenser by inner tube and
Outer tube is constituted, and said inner tube is formed with helical structure；The spraying-preventing system is returned by U-shaped diversion pipe, plastic pipe ferrule and blowout prevention
Receive bucket composition；The ventilating system is made of draught cupboard；The top of the glass dehydrator is divided into column structure, and lower part is divided into cone
Body structure.The device is suitable for the dehydration of various light crude oils and heavy crude.
As Chinese patent CN201611161377.0 disclose it is a kind of improve multi-purpose station crude oil dehydration efficiency system and side
Method comprising three phase separator, three phase separator connection purification oil export pipeline purify on oil export pipeline along crude oil flow
Direction is equipped with moisture-content monitoring instrument and solenoid valve successively, and moisture-content monitoring instrument connects a controller with solenoid valve；Solenoid valve passes through pipeline
It is separately connected purification oil tank and settling tank, settling tank connects purification oil tank by overflow line, and purification oil tank connects an output pump,
The output end of output pump connects an exporting flow meter；Moisture-content monitoring instrument monitors the purification oil of the wet crude outlet of three phase separator
Moisture content, and the water cut in purified monitored is transferred to controller, control solenoid valve is in purification oil tank after controller judges
The switched conductive between settling tank.
Having technology for petroleum-type and water to have greater density above, poor (usual density contrast is more than 80kg/m3) more than when,
It can be good at realizing automatic dehydration.But in petroleum chemical enterprise's petroleum-type storage tank dehydration, when density contrast is less than 80kg/m3
When, the problem serious with regard to will appear dewatering bands oil, or even cannot achieve the automatic dehydration of crude oil storage tank.When must manually be taken off
When water, for compared with larger storage tank (5000m3More than) due to dewatering time it is longer, be affected by factors such as operating personnel's sense of responsibility,
It easily causes to close valve operation not in time, dewatering bands oil phenomenon.While causing petroleum-type largely to lose, to the steady of sewage farm
Fixed operation brings serious influence.And generally existing dewatering process flow is long, equipment is complicated, the problem of taking up a large area.
Invention content
In view of the problems of the existing technology, this method provides a kind of petroleum substance automatic dehydration system, and the present invention is set
Standby simple, operation is easy to maintenance, is converted to from density contrast more rambunctious control and is easier to controlled pressure difference control, to solve
Density larger petroleum substance automatic dehydration problem.
The present invention petroleum substance automatic dehydration system include pressure difference transmitter, turbulent-flow-prevention baffle, automatic water-removing valve and
Hold in the palm water pipe；The wherein described pressure difference transmitter setting has upper and lower two pressures point, in pressure difference in petroleum substance storage tank lower part
Interference guard flow-stopping plate is nearby arranged in the lower pressure point of transmitter, and automatic water-removing valve, dehydrated mouth is arranged in petroleum substance tank bottom
It uniformly arranges in petroleum substance tank inside far from lower pressure point, dehydrating tube position.
Wherein, the pressure difference of the pressure difference transmitter is in ρWaterGH and ρOilIt is high with oil, water density difference and pressure point between gH
Poor H is directly proportional.
The two pressure point height difference H of pressure difference transmitter is between 0.5 meter~1.5 meters.
The dehydration open height is less than pressure point 50mm under difference gauge.
By-pass is arranged in the automatic water-removing valve.
Compared with prior art, the features of the present invention and advantageous effect are：
Using the petroleum substance automatic dehydration system of the present invention, pressure difference transmitter is set in petroleum-type storage tank lower part, is taken
Turbulent-flow-prevention baffle is nearby arranged in pressure point, can reduce the influence to differential pressure transmitter due to the variation of medium circle position, improve control
Automatic water-removing valve is arranged in precision, tank bottom, and dehydrated mouth position is as possible far from pressure point.Dehydrating tube is done uniformly in tank interior
Discharge structure accomplishes that storage tank lower part water level even declines as possible.
When medium is detached due to grease density contrast in storage tank, media interior forms oil-water interfaces, due to oil phase and
The density difference of water phase causes differential pressure transmitter numerical value to change with the variation of oil water interface height, and following three operating mode is divided to carry out
Calculate analysis：
Operating mode 1 is as shown in Figure of description Fig. 1：When oil-water interfaces are more than the measuring mouth of pressure difference transmitter top, pressure difference
Transmitter numerical value is：
Δ P=ρWatergH
Wherein：
Δ P --- pressure difference liquid level count value, kPa
ρWater--- the density of water phase, kg/m3
G --- acceleration of gravity, N/kg
H --- pressure difference transmitter measures pressure point spacing, m；
Operating mode 2 is as shown in Figure of description Fig. 2：When oil-water interfaces are located between pressure difference transmitter amount pressure tap, pressure difference
Transmitter numerical value is：
Δ P=ρOilgh+ρWaterG (H-h)=ρWatergH-(ρWater-ρOil)gh
Wherein：
Δ P --- pressure difference liquid level count value, kPa
ρWater--- the density of water phase, kg/m3
ρOil--- the density of oil phase, kg/m3
G --- acceleration of gravity, N/kg
H --- pressure difference transmitter measures pressure point spacing, m
Operating mode 3 is as shown in Figure of description Fig. 3：When oil-water interfaces are below the pressure tap of pressure difference transmitter lower part, pressure difference
Transmitter numerical value is：
Δ P=ρOilgH
Wherein：
Δ P --- pressure difference liquid level count value, kPa
ρWater--- the density of water phase, kg/m3
ρOil--- the density of oil phase, kg/m3
G --- acceleration of gravity, N/kg
H --- pressure difference transmitter measures pressure point spacing, m.
The value of differential pressure transmitter is always positioned at ρ it can be seen from analyzing aboveWaterGH and ρOilBetween gH, the value and grease are close
Degree difference is directly proportional with pressure point height difference H, when grease density contrast is smaller, can suitably increase pressure point height difference H to realize pressure difference
Accurate measurement, to accurately control displacement, avoid in water with oil phenomenon occur.
When during the dehydration process, as oil water interface constantly declines in tank, pressure difference transmitter numerical value is gradual for medium in storage tank
No longer change after dropping to definite value, when dehydration temperaturre is stablized relatively, pressure difference is stablized relatively, and it is relatively steady to correspond to oil density
Fixed petroleum-type dehydration, during the dehydration process, pressure difference transmitter numerical value slowly declines, decline rule be increase with oil density and
Reduce.As long as determining the density of oil product before dehydration, then pressure difference transmitter initial value can be determined by DCS system, by setting
Determine fall and realizes automatic storage tank dewatering for drain valve closedown condition.
Pressure difference transmitter initial value and fall and the height difference H of 2 pressure points have compared with Important Relations, and height difference is bigger, initially
The amplitude that value and dehydration numerical value decline is bigger.In view of the display accuracy of numerical value, maintaining equipments convenience and
It is economical, it is proposed that two pressure point height difference of pressure difference transmitter is between 0.5 meter~1.5 meters.
Pressure difference transmitter instrument used in present system is Common Instrument, and investment is low, to material without particular/special requirement,
It is consistent with equipment, pipeline body material, it is not related to heterogeneous material Welding Problems.
In view of the practicability of control, the dehydration open height of actual installation of the present invention is left less than pressure tappings 50mm under difference gauge
The right side, it is apparent without petroleum-type in removed water to ensure.
In view of drainage procedure, turbulent-flow-prevention baffle is arranged in influence of the media flow to pressure point precision near pressure tappings,
Reduce the velocity of medium of pressure tappings attachment.
Sampled functions under petrochina substance storage tank tank body setting 3 to five tanks of upper, middle and lower of the present invention, in order to which multiple spot takes
Sample analyzes Media density, is corrected to the difference gauge of younger oil.
By-pass is arranged in automatic water-removing valve of the present invention, convenient for the maintenance to valve under accident condition.
Description of the drawings
Fig. 1 is the petroleum substance automatic dehydration system schematic of operating mode 1；
Fig. 2 is the petroleum substance automatic dehydration system schematic of operating mode 2；
Fig. 3 is the petroleum substance automatic dehydration system schematic of operating mode 3；
Fig. 4 is the petroleum substance automatic dehydration system front view of the present invention；
Fig. 5 is the petroleum substance automatic dehydration system Section A-A figure of the present invention.
Wherein：1：Petroleum substance storage tank；2：Pressure difference transmitter；3：Turbulent-flow-prevention baffle；4：Automatic water-removing valve；5：Pressure
Point；6：Dehydrating tube.
Specific implementation mode
Embodiment 1
Medium temperature is 60 DEG C in tank when embodiment storage tank is dehydrated, at this time ρ water=983.2kg/m3, ρ oil=920kg/m3,
Pressure difference liquid level gauge pressure point height difference H=2m, three kinds of operating modes are as shown in FIG. 1 to 3.
Operating mode 1：When oil-water interfaces are more than the measuring mouth of pressure difference transmitter top, pressure difference transmitter value, Δ P1For：
ΔP1=ρWaterGH=983.2kg/m3× 9.8N/kg × 2m=19270.72Pa ≈ 19.27kPa
Operating mode 2：When oil-water interfaces are located between pressure difference transmitter amount pressure tap, h=0,0.5, h=1, h=are taken respectively
1.5,2 calculate pressure difference transmitter value, Δ P2, Δ P3, Δ P4, Δ P5, Δ P6For：
ΔP2=ρOilgh+ρWaterG (H-h)=ρWatergH-(ρWater-ρOil) gh=Δs P1-(ρWater-ρOil)gh
=19270.72Pa- (983.2-920) kg/m3× 9.8N/kg × 0m=19270.72Pa ≈ 19.27kPa=Δs P1
ΔP3=ρOilgh+ρWaterG (H-h)=ρWatergH-(ρWater-ρOil) gh=Δs P1-(ρWater-ρOil)gh
=19270.72Pa- (983.2-920) kg/m3× 9.8N/kg × 0.5m=18961.04Pa ≈ 18.96kPa
ΔP4=ρOilgh+ρWaterG (H-h)=ρWatergH-(ρWater-ρOil) gh=Δs P1-(ρWater-ρOil)gh
=19270.72Pa- (983.2-920) kg/m3× 9.8N/kg × 1m=18651.36Pa ≈ 18.65kPa
ΔP5=ρOilgh+ρWaterG (H-h)=ρWatergH-(ρWater-ρOil) gh=Δs P1-(ρWater-ρOil)gh
=19270.72Pa- (983.2-920) kg/m3× 9.8N/kg × 1.5m=18341.68Pa ≈ 18.34kPa
ΔP6=ρOilgh+ρWaterG (H-h)=ρWatergH-(ρWater-ρOil) gh=Δs P1-(ρWater-ρOil)gh
=19270.72Pa- (983.2-920) kg/m3× 9.8N/kg × 2m=18032Pa ≈ 18.03kPa
Operating mode 3：When oil-water interfaces are below the pressure tap of pressure difference transmitter lower part, pressure difference transmitter value, Δ P7For：
ΔP7=ρOilGH=920kg/m3× 9.8N/kg × 2m=18032Pa ≈ 18.03kPa=Δs P6
By result it is found that working as storage tank during the dehydration process, as oil water interface constantly declines in tank, pressure difference transmitter numerical value
By Δ P1It is gradually decreased to Δ P7, i.e. pressure difference transmitter value, Δ P=Δs P1-ΔP7=19.27kPa-18.03kPa=1.24kPa,
No longer change later.
When water petrochina class density changes, at different temperatures, pressure difference transmitter numerical value change range delta P1~
ΔP7And pressure drop Δ P situations of change see the table below：
As seen from the above table, when dehydration temperaturre is stablized relatively, Δ P1Value is stablized relatively, corresponds to oil density and stablizes relatively
Petroleum-type dehydration, during the dehydration process, pressure difference transmitter numerical value slowly declines, fall be 0.1~0.8kPa, decline rule
Rule reduces to increase with oil density.As long as determining the density of oil product before dehydration, then it can determine that pressure difference becomes by DCS system
Device initial value is sent, automatic storage tank dewatering is realized by setting fall as drain valve closedown condition.
It also can be seen that by data in table, pressure difference transmitter initial value and fall and the height difference of 2 pressure points have larger
Relationship, height difference is bigger, and the amplitude that initial value and dehydration numerical value decline is bigger.Accuracy, equipment in view of display numerical value
The convenience and economy of installation and maintenance, therefore two pressure point height difference of pressure difference transmitter is between 0.5 meter~1.5 meters.
Embodiment 2
The automatic dehydration system for installing the present embodiment additional on the sump oil storage tank of sewage farm recycling, due to the sump oil of recycling
Water content is up to 50%~70%, and dewatering time is long.Reduce manpower after setting the present embodiment system, whole system is realized automatic
Change control, as shown in Figure 4 and Figure 5.
Embodiment 3
The present embodiment uses automatic dewatering unit in heavy crude storage tank, since grease density contrast is smaller, certainly with routine
Dynamic dewatering system cannot achieve, and for crude oil storage tank volume generally at 10000 cubic metres or more, dewatering time is long.Due to that can not know
Dao Guanzhong circle, artificial dehydration, which inevitably often results in dehydration valve closing, to be caused to run oily phenomenon not in time.Increase this implementation
Automatic dehydration is realized after example system, and is reduced due to economic loss caused by operation error.
Claims (5)
1. a kind of petroleum substance automatic dehydration system, it is characterised in that including pressure difference transmitter, turbulent-flow-prevention baffle, automatic dehydration
Valve and support water pipe；The wherein described pressure difference transmitter setting has upper and lower two pressures point in petroleum substance storage tank lower part,
Interference guard flow-stopping plate is nearby arranged in the lower pressure point of pressure difference transmitter, and automatic water-removing valve is arranged in petroleum substance tank bottom, takes off
It uniformly arranges in petroleum substance tank inside far from lower pressure point, dehydrating tube mouth of a river position.
2. a kind of petroleum substance automatic dehydration system according to claim 1, it is characterised in that the pressure difference pick-up
The pressure difference of device is in ρWaterGH and ρOilIt is directly proportional to oil, water density difference and pressure point height difference H between gH.
3. a kind of petroleum substance automatic dehydration system according to claim 1, it is characterised in that the pressure difference pick-up
Two pressure point height difference H of device is between 0.5 meter~1.5 meters.
4. a kind of petroleum substance automatic dehydration system according to claim 1, it is characterised in that the dehydrated mouth is high
Degree is less than pressure point 50mm under difference gauge.
5. a kind of petroleum substance automatic dehydration system according to claim 1, it is characterised in that the automatic dehydration
By-pass is arranged in valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810056090.4A CN108342218A (en) | 2018-01-20 | 2018-01-20 | A kind of petroleum substance automatic dehydration system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810056090.4A CN108342218A (en) | 2018-01-20 | 2018-01-20 | A kind of petroleum substance automatic dehydration system |
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| CN108342218A true CN108342218A (en) | 2018-07-31 |
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| CN201810056090.4A Pending CN108342218A (en) | 2018-01-20 | 2018-01-20 | A kind of petroleum substance automatic dehydration system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2132166Y (en) * | 1992-08-13 | 1993-05-05 | 汤广武 | Interface variable dilivery device |
| CN2783275Y (en) * | 2005-04-15 | 2006-05-24 | 浙江大学 | Three-phase flow continuous metering system for oil, gas and water with high water content |
| CN102322908A (en) * | 2011-08-11 | 2012-01-18 | 南通市飞宇石油科技开发有限公司 | Differential pressure type oil-gas-water three-phase metering device |
| CN105501733A (en) * | 2016-01-29 | 2016-04-20 | 武汉工程大学 | Automatic dewatering device of oil storage tank and application method of automatic dewatering device |
-
2018
- 2018-01-20 CN CN201810056090.4A patent/CN108342218A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2132166Y (en) * | 1992-08-13 | 1993-05-05 | 汤广武 | Interface variable dilivery device |
| CN2783275Y (en) * | 2005-04-15 | 2006-05-24 | 浙江大学 | Three-phase flow continuous metering system for oil, gas and water with high water content |
| CN102322908A (en) * | 2011-08-11 | 2012-01-18 | 南通市飞宇石油科技开发有限公司 | Differential pressure type oil-gas-water three-phase metering device |
| CN105501733A (en) * | 2016-01-29 | 2016-04-20 | 武汉工程大学 | Automatic dewatering device of oil storage tank and application method of automatic dewatering device |
Non-Patent Citations (2)
| Title |
|---|
| 杜永昌: "差压法测油水界面在游离水脱除器上的应用", 《油气田地面工程》 * |
| 胡忠泽: "差压法测量液位问题探讨", 《石油化工自动化》 * |
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Application publication date: 20180731 |