CN104296832A - LNG (liquefied natural gas) storage tank liquid level measuring method and equipment - Google Patents
LNG (liquefied natural gas) storage tank liquid level measuring method and equipment Download PDFInfo
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- CN104296832A CN104296832A CN201410619599.7A CN201410619599A CN104296832A CN 104296832 A CN104296832 A CN 104296832A CN 201410619599 A CN201410619599 A CN 201410619599A CN 104296832 A CN104296832 A CN 104296832A
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Abstract
The invention discloses an LNG storage tank liquid level measuring method and equipment. The equipment comprises an LNG storage tank, and a vertical capacitance liquid level meter vertically arranged in the storage tank, and further comprises a horizontal capacitance liquid level meter horizontally arranged at the top in the storage tank, and a processor receiving measurement signals of the vertical capacitance liquid level meter and the horizontal capacitance liquid level meter, wherein the processor obtains a liquid phase dielectric constant when the horizontal capacitance liquid level meter is positioned in liquid phase space, and the processor obtains a gas phase dielectric constant when the horizontal capacitance liquid level meter is positioned in gas phase space; the processor obtains total capacitance and the height of liquid level to be obtained from the vertical capacitance liquid level meter during measurement, obtains gas phase space factor capacitance through the gas phase dielectric constant, and obtains a result liquid level height through the liquid phase dielectric constant after the gas phase space factor capacitance is removed from the total capacitance. The equipment is more accurate to measure the liquid level in the LNG storage tank.
Description
Technical field
The present invention relates to level gauging field in LNG tank, more particularly LNG (liquefied natural gas (LNG)) liquid level measurement method and apparatus.
Background technology
Liquefied Natural Gas fuel cost is low, and wherein principal ingredient is methane, and after burning, objectionable constituent are less, uses comparatively extensive in large-scale heavy goods vehicles as the fuel of engine.When LNG storage tank is filled with LNG in inside but is discontented with liquid, exist and be full of the liquid Space of liquified natural gas and be full of the gas-phase space of gaseous natural gas, generally measure by the liquid level of a vertical liquid level gauge to liquid Space in storage tank, stretch out storage tank by cable and processes and displays is carried out in signal transmitting output, its principle is that the capacitance variations backstepping caused by the change of liquid level between liquid level gauge inner and outer tubes goes out liquid level, but exposed for the liquid level gauge electric capacity produced between storage tank gas-phase space that section of inner and outer pipes and gas is not taken into account by such metering system, in fact, along with the change of liquid level in storage tank, operative liquid rock gas can convert gaseous natural gas to, in storage tank, pressure can corresponding change, but liquid level gauge is in the electric capacity produced between the inner and outer pipes of gas-phase space part and gas can not ignore, if measure to a certain extent by this part capacitive effect of gas-phase space by means of only single liquid level gauge, measurement result is not accurate enough.
In addition, the specific inductive capacity of the LNG that each LNG storage tank is filled usually can be different, and the specific inductive capacity of its gas-phase space generally also can be different, and single vertical liquid level gauge can not record these information, can produce error when measuring the liquid level of filling Different L NG storage tank.
Summary of the invention
The object of this invention is to provide a kind of LNG storage tank level measuring method and equipment, measure liquid level in LNG storage tank more accurate.
In order to solve the problems of the technologies described above, the present invention adopts technical scheme: a kind of LNG storage tank level measuring method, possess comprise vertically to be located in storage tank vertical capacitance liquid level meter, the measuring equipment of the processor of the horizontal capacitor liquid level gauge that crosses at storage tank inner top and the measuring-signal that receives vertical capacitance liquid level meter and horizontal capacitor liquid level gauge, described measuring-signal comprises capacitance signal, and the method comprises the following steps:
When liquid filled by storage tank, described horizontal capacitor liquid level gauge is immersed in liquid Space, and processor obtains liquid Space specific inductive capacity according to horizontal capacitor electric capacity that liquid level gauge is surveyed and inside and outside caliber thereof and measurement section pipe range;
When tank level be reduced to horizontal capacitor liquid level gauge be in gas-phase space completely time, processor processes measuring-signal, first obtains gas-phase space specific inductive capacity according to horizontal capacitor electric capacity that liquid level gauge is surveyed and inside and outside caliber thereof and measurement section pipe range; Then
Survey total capacitance according to vertical capacitance liquid level meter and obtain liquid level undetermined in conjunction with described liquid Space specific inductive capacity, described total capacitance doping gas-phase space capacitance factor and liquid Space capacitance factor; Then
Determine described gas-phase space capacitance factor according to described liquid level undetermined and described gas-phase space specific inductive capacity, described liquid level undetermined associates described total capacitance; Then
In total capacitance, remove described gas-phase space capacitance factor obtain described liquid Space capacitance factor, and obtain result liquid level in conjunction with described liquid phase specific inductive capacity.
According to one embodiment of present invention, the first electric capacity that described liquid Space capacitance factor is formed for the part between vertical capacitance liquid level meter inner and outer pipes shared by liquid Space and liquid, the second electric capacity that described gas-phase space capacitance factor is formed for the part between vertical capacitance liquid level meter inner and outer pipes shared by gas-phase space and gas, described total capacitance is formed by the first electric capacity and the second Capacitance parallel connection.
According to one embodiment of present invention, as follows for determining the formula of described result liquid level:
Wherein, C
alwaysfor total capacitance, C
gasfor the second electric capacity of described gas-phase space capacitance factor, D is the outer tube diameter of vertical capacitance liquid level meter, and d is the interior caliber of vertical capacitance liquid level meter, ε
0for dielectric constant of air, ε
liquidfor described liquid Space relative dielectric constant.
According to one embodiment of present invention, after determining described result liquid level, processor transmits it to display unit display.
According to one embodiment of present invention, described liquid Space specific inductive capacity is store after once measuring, described gas-phase space specific inductive capacity is for once measuring or repeatedly measure storage in liquid level change procedure, and processor calls described liquid Space specific inductive capacity and gas-phase space specific inductive capacity.
The present invention also adopts following technical scheme: a kind of LNG storage tank fluid level measuring device, comprise the storage tank that LNG is housed, vertically be located at the setting capacitance liquid level meter in storage tank, also comprise the horizontal capacitor liquid level gauge crossing at storage tank inner top, receive the processor of the measuring-signal of described vertical capacitance liquid level meter and described horizontal capacitor liquid level gauge;
Wherein, when described horizontal capacitor liquid level gauge is in liquid Space, described processor obtains liquid phase specific inductive capacity, and when being in gas-phase space, described processor obtains gas phase specific inductive capacity;
In measuring phases, processor obtains total capacitance and liquid level undetermined from vertical capacitance liquid level meter, and obtain gas-phase space factor electric capacity in conjunction with described gas phase specific inductive capacity, obtain result liquid level in conjunction with described liquid phase specific inductive capacity after total capacitance being removed described gas-phase space factor electric capacity.
According to one embodiment of present invention, described storage tank traverse or place vertically is placed on car body.
According to one embodiment of present invention, described setting capacitance liquid level meter comprises measurement section and Signal transmissions portion, and its measurement section inserts in storage tank, Signal transmissions portion stretches out in outside storage tank; Described horizontal capacitor liquid level gauge comprises measurement section and Signal transmissions portion, and its measurement section crosses at storage tank inner top, Signal transmissions portion stretches out in outside storage tank.
According to one embodiment of present invention, also comprise display unit, described result liquid level is transferred to display unit display by described processor.
After adopting technique scheme, the present invention compared with prior art has following outstanding advantages: can record liquid phase specific inductive capacity and gas phase specific inductive capacity by the horizontal capacitor liquid level gauge crossing at tank deck, through the process of processor, can in conjunction with cylindrical capacitive formula and principle will erect the gas medium of the total capacitance removing gas-phase space that liquid level gauge records and erect the electric capacity produced between liquid level gauge, thus the liquid level of the electric capacity obtained association will more approach true liquid level.
Accompanying drawing explanation
Fig. 1 is the structural representation of the LNG storage tank fluid level measuring device of the embodiment of the present invention;
Fig. 2 is the process flow diagram of the LNG storage tank level measuring method of the embodiment of the present invention.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
Set forth a lot of detail in the following description so that fully understand the present invention.But the present invention can be much different from alternate manner described here to implement, those skilled in the art can when without prejudice to doing similar popularization when intension of the present invention, and therefore the present invention is by the restriction of following public concrete enforcement and concrete accompanying drawing.
Fig. 1 shows a kind of structure of LNG storage tank fluid level measuring device, comprise the storage tank 1 that LNG is housed, vertically be located at the setting capacitance liquid level meter 2 in storage tank 1, also comprise the horizontal capacitor liquid level gauge 3 crossing at storage tank 1 inner top, receive the processor 4 of the measuring-signal of described vertical capacitance liquid level meter 2 and described horizontal capacitor liquid level gauge 3.Liquid level in LNG storage tank 1 shown in Fig. 1 makes horizontal capacitor liquid level gauge 3 completely exposed in gas-phase space, and when the full liquid of storage tank 1, the measurement section of horizontal capacitor liquid level gauge 3 is soaked in a liquid completely.
Wherein, when described horizontal capacitor liquid level gauge 3 is in liquid Space, described processor 4 obtains liquid phase specific inductive capacity, and when being in gas-phase space, described processor 4 obtains gas phase specific inductive capacity; In measuring phases, processor 4 obtains total capacitance and liquid level undetermined from vertical capacitance liquid level meter 2, and obtain gas-phase space factor electric capacity in conjunction with described gas phase specific inductive capacity, obtain result liquid level in conjunction with described liquid phase specific inductive capacity after total capacitance being removed described gas-phase space factor electric capacity.
General LNG gas cylinder is much all used on vehicle, is that engine is powered with LNG gas, is necessary in automobile-used LNG gas cylinder to the measurement of liquid level, in one embodiment, storage tank 1 traverse or place vertically is placed on car body.
According to one embodiment of present invention, described setting capacitance liquid level meter 2 comprises measurement section and Signal transmissions portion, and its measurement section inserts in storage tank 1, Signal transmissions portion stretches out in outside storage tank 1; Described horizontal capacitor liquid level gauge 3 comprises measurement section and Signal transmissions portion, its measurement section crosses at storage tank 1 inner top, Signal transmissions portion stretches out in outside storage tank 1, the inner and outer tubes for the formation of electric capacity two metallic walls of measurement section and liquid level gauge, Signal transmissions portion is namely for transferring to outside cable and syndeton thereof by electric potential signal etc.
Should be appreciated that the Implant position regardless of storage tank 1, the measurement section erectting capacitance liquid level meter 2 is axially parallel to gravity direction, and the measurement section of horizontal capacitor liquid level gauge 3 is axially perpendicular to gravity direction.
Fig. 2 illustrates a kind of LNG storage tank level measuring method, comprises the steps:
S1: during the full liquid of initial storage tank, described horizontal capacitor liquid level gauge is in liquid Space completely, processor is according to horizontal capacitor electric capacity that liquid level gauge is surveyed and inside and outside caliber thereof and measurement section pipe range acquisition liquid Space specific inductive capacity;
S2: tank level reduces, when described horizontal capacitor liquid level gauge is in gas-phase space completely, first processor is according to horizontal capacitor electric capacity that liquid level gauge is surveyed and inside and outside caliber thereof and measurement section pipe range acquisition gas-phase space specific inductive capacity;
S3: processor is surveyed total capacitance according to vertical capacitance liquid level meter and obtained liquid level undetermined in conjunction with described liquid Space specific inductive capacity, described total capacitance doping gas-phase space capacitance factor and liquid Space capacitance factor;
S4: processor determines described gas-phase space capacitance factor according to described liquid level undetermined and described gas-phase space specific inductive capacity, and described liquid level undetermined associates described total capacitance;
S5: processor removes described gas-phase space capacitance factor and obtains described liquid Space capacitance factor in total capacitance, and obtain result liquid level in conjunction with described liquid phase specific inductive capacity.
Composition graphs 1 and Fig. 2, vertical capacitance liquid level meter 2 is vertically located in storage tank 1, when liquid is entered between inner and outer tubes by liquid level gauge bottom end opening, form a cylindrical capacitive, along with the change of liquid level, also can there is respective change in capacitance, can backstepping liquid level information be converted into the signal that can show after processor 4 receives this electric capacity, horizontal capacitor liquid level gauge 3 crosses at storage tank inner top, the measurement data of horizontal capacitor liquid level gauge 3 is only when it immerses in liquid completely and when being in gas-phase space completely, when it immerses liquid (being in liquid Space) completely, only form electric capacity by tube wall inside and outside liquid and horizontal capacitor liquid level gauge 3, when it is in gas-phase space completely, the inside and outside tube wall of gas and horizontal capacitor liquid level gauge 3 is only had to form electric capacity, liquid Space specific inductive capacity and gas-phase space specific inductive capacity can be measured respectively, processor receives the measuring-signal of vertical capacitance liquid level meter 2 and horizontal capacitor liquid level gauge 3, described measuring-signal comprises capacitance signal, processor 4 pairs of capacitance signals process other data of rear acquisition, such as liquid Space specific inductive capacity and gas-phase space specific inductive capacity etc.
Concrete, measuring method comprises: when liquid expired by initial storage tank 1, described horizontal capacitor liquid level gauge 3 is in liquid Space completely, processor 4 according to horizontal capacitor liquid level gauge 2 survey electric capacity and inside and outside caliber thereof and measurement section pipe range obtains liquid Space specific inductive capacity, according to the desirable computing formula of cylindrical capacitive, known capacitance, inside and outside caliber and measurement section pipe range (forming two metallic walls length of electric capacity) can in the hope of liquid Space specific inductive capacity; In use, storage tank 1 liquid level can reduce, when described horizontal capacitor liquid level gauge 3 is in gas-phase space completely, first processor 4 according to horizontal capacitor liquid level gauge 3 survey electric capacity and inside and outside caliber thereof and measurement section pipe range obtains gas-phase space specific inductive capacity, the same desirable computing formula of cylindrical capacitive that uses obtains; Then processor 4 according to vertical capacitance liquid level meter 2 survey total capacitance and (directly produced by vertical capacitance liquid level meter 2, because existing liquid Space has again gas-phase space therefore to have two parts electric capacity) and obtain liquid level undetermined in conjunction with described liquid Space specific inductive capacity, described total capacitance doping gas-phase space capacitance factor and liquid Space capacitance factor; Then processor 4 determines described gas-phase space capacitance factor according to described liquid level undetermined and described gas-phase space specific inductive capacity, just the height of gas-phase space can be obtained after described liquid level undetermined obtains, can obtain the capacitance of described gas-phase space capacitance factor according to capacitance equation in conjunction with caliber inside and outside gas-phase space specific inductive capacity and setting electric capacity, described liquid level undetermined associates described total capacitance; Then processor 4 removes described gas-phase space capacitance factor and obtains described liquid Space capacitance factor in total capacitance, and obtains result liquid level in conjunction with described liquid phase specific inductive capacity.The capacitive effect that this result liquid level eliminates gas-phase space and erects between capacitance liquid level meter, more approaching to reality value.
It should be noted that, inside and outside caliber of the present invention, all refers to interior pipe external diameter and the outer tube diameter of liquid level gauge, in order to being conveniently called for short of stating.
Described total capacitance doping gas-phase space capacitance factor and liquid Space capacitance factor, namely total capacitance is made up of two parts, the first electric capacity that described liquid Space capacitance factor is formed with liquid for the part between vertical capacitance liquid level meter 2 inner and outer pipes shared by liquid Space, the second electric capacity that described gas-phase space capacitance factor is formed with gas for the part between vertical capacitance liquid level meter 2 inner and outer pipes shared by gas-phase space, described total capacitance is formed by the first electric capacity and the second Capacitance parallel connection, remove described gas-phase space capacitance factor in total capacitance and obtain described liquid Space capacitance factor, namely total capacitance deducts the second electric capacity.By the first electric capacity, liquid Space specific inductive capacity, erect the liquid level more approaching to reality value that inside and outside capacitance liquid level meter 2, caliber obtains.
As follows for determining the formula of described result liquid level:
Wherein, C
alwaysfor total capacitance, C
gasfor the second electric capacity of described gas-phase space capacitance factor, D is the outer tube diameter of vertical capacitance liquid level meter, and d is the interior pipe external diameter of vertical capacitance liquid level meter, ε
0for dielectric constant of air, ε
liquidfor described liquid Space relative dielectric constant.
Concrete, calculation procedure is as follows:
C '
liquidby being surveyed electric capacity when horizontal capacitor liquid level gauge is immersed in liquid Space, C '
gasby being surveyed electric capacity when horizontal capacitor liquid level gauge is in gas-phase space completely, D
level/ d
levelfor the outer inner tube diameter ratio of horizontal capacitor liquid level gauge, ε
gasfor the relative dielectric constant of gas-phase space.
According to one embodiment of present invention, as Fig. 1, present device also comprises display unit 5, and described result liquid level is transferred to display unit 5 and shows by described processor 4, and after determining described result liquid level, processor 4 transmits it to display unit 5 and shows.
According to one embodiment of present invention, described liquid Space specific inductive capacity is store after once measuring, described gas-phase space specific inductive capacity is for once measuring or repeatedly measure storage in liquid level change procedure, and processor 4 calls described liquid Space specific inductive capacity and gas-phase space specific inductive capacity.
The present invention can record liquid phase specific inductive capacity and gas phase specific inductive capacity by the horizontal capacitor liquid level gauge crossing at tank deck, through the process of processor, can in conjunction with cylindrical capacitive formula and principle will erect the gas medium of the total capacitance removing gas-phase space that liquid level gauge records and erect the electric capacity produced between liquid level gauge, thus the liquid level of the electric capacity obtained association will more approach true liquid level.
Although the present invention with preferred embodiment openly as above; but it is not for limiting claim; any those skilled in the art without departing from the spirit and scope of the present invention; can make possible variation and amendment, the scope that therefore protection scope of the present invention should define with the claims in the present invention is as the criterion.
Claims (9)
1. a LNG storage tank level measuring method, it is characterized in that, possess comprise vertically to be located in storage tank vertical capacitance liquid level meter, the measuring equipment of the processor of the horizontal capacitor liquid level gauge that crosses at storage tank inner top and the measuring-signal that receives vertical capacitance liquid level meter and horizontal capacitor liquid level gauge, described measuring-signal comprises capacitance signal, and the method comprises the following steps:
When liquid filled by storage tank, described horizontal capacitor liquid level gauge is immersed in liquid Space, and processor obtains liquid Space specific inductive capacity according to horizontal capacitor electric capacity that liquid level gauge is surveyed and inside and outside caliber thereof and measurement section pipe range;
When tank level be reduced to horizontal capacitor liquid level gauge be in gas-phase space completely time, processor processes measuring-signal, first obtains gas-phase space specific inductive capacity according to horizontal capacitor electric capacity that liquid level gauge is surveyed and inside and outside caliber thereof and measurement section pipe range; Then
Survey total capacitance according to vertical capacitance liquid level meter and obtain liquid level undetermined in conjunction with described liquid Space specific inductive capacity, described total capacitance doping gas-phase space capacitance factor and liquid Space capacitance factor; Then
Determine described gas-phase space capacitance factor according to described liquid level undetermined and described gas-phase space specific inductive capacity, described liquid level undetermined associates described total capacitance; Then
In total capacitance, remove described gas-phase space capacitance factor obtain described liquid Space capacitance factor, and obtain result liquid level in conjunction with described liquid phase specific inductive capacity.
2. a kind of LNG storage tank level measuring method according to claim 1, it is characterized in that, the first electric capacity that described liquid Space capacitance factor is formed for the part between vertical capacitance liquid level meter inner and outer pipes shared by liquid Space and liquid, the second electric capacity that described gas-phase space capacitance factor is formed for the part between vertical capacitance liquid level meter inner and outer pipes shared by gas-phase space and gas, described total capacitance is formed by the first electric capacity and the second Capacitance parallel connection.
3. a kind of LNG storage tank level measuring method according to claim 2, is characterized in that, as follows for determining the formula of described result liquid level:
Wherein, C
alwaysfor total capacitance, C
gasfor the second electric capacity of described gas-phase space capacitance factor, D is the outer tube diameter of vertical capacitance liquid level meter, and d is the interior pipe external diameter of vertical capacitance liquid level meter, ε
0for dielectric constant of air, ε
liquidfor described liquid Space relative dielectric constant.
4. a kind of LNG storage tank level measuring method according to claim 1, is characterized in that, after determining described result liquid level, processor transmits it to display unit display.
5. a kind of LNG storage tank level measuring method according to claim 1, it is characterized in that, described liquid Space specific inductive capacity is store after once measuring, described gas-phase space specific inductive capacity is for once measuring or repeatedly measure storage in liquid level change procedure, and processor calls described liquid Space specific inductive capacity and gas-phase space specific inductive capacity.
6. a LNG storage tank fluid level measuring device, comprise the storage tank that LNG is housed, vertically be located at the setting capacitance liquid level meter in storage tank, it is characterized in that, also comprise the horizontal capacitor liquid level gauge crossing at storage tank inner top, receive the processor of the measuring-signal of described vertical capacitance liquid level meter and described horizontal capacitor liquid level gauge;
Wherein, when described horizontal capacitor liquid level gauge is in liquid Space, described processor obtains liquid phase specific inductive capacity, and when being in gas-phase space, described processor obtains gas phase specific inductive capacity;
In measuring phases, processor obtains total capacitance and liquid level undetermined from vertical capacitance liquid level meter, and obtain gas-phase space factor electric capacity in conjunction with described gas phase specific inductive capacity, obtain result liquid level in conjunction with described liquid phase specific inductive capacity after total capacitance being removed described gas-phase space factor electric capacity.
7. a kind of LNG storage tank fluid level measuring device according to claim 1, is characterized in that, described storage tank traverse or place vertically is placed on car body.
8. a kind of LNG storage tank fluid level measuring device according to claim 1, is characterized in that, described setting capacitance liquid level meter comprises measurement section and Signal transmissions portion, and its measurement section inserts in storage tank, Signal transmissions portion stretches out in outside storage tank; Described horizontal capacitor liquid level gauge comprises measurement section and Signal transmissions portion, and its measurement section crosses at storage tank inner top, Signal transmissions portion stretches out in outside storage tank.
9. a kind of LNG storage tank fluid level measuring device according to claim 1, is characterized in that, also comprise display unit, and described result liquid level is transferred to display unit display by described processor.
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| CN105091979A (en) * | 2015-09-21 | 2015-11-25 | 中国石油大学(华东) | Method for conducting liquid level measuring through triangular capacitance-type sensor |
| CN105136245A (en) * | 2015-09-21 | 2015-12-09 | 中国石油大学(华东) | Triangular capacitive sensor and liquid level measuring system |
| CN105136246A (en) * | 2015-10-26 | 2015-12-09 | 中国石油大学(华东) | Plate type capacitance sensor and liquid level measurement system |
| CN105197456A (en) * | 2015-09-17 | 2015-12-30 | 太仓市金锚化工有限公司 | Gaugeable storage tank for low-specific-gravity liquid chemicals |
| CN106194738A (en) * | 2015-05-08 | 2016-12-07 | 丹佛斯（天津）有限公司 | Supervising device and monitoring method |
| CN106771046A (en) * | 2016-12-08 | 2017-05-31 | 北京航天试验技术研究所 | LNG quality device for fast detecting |
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Application publication date: 20150121 |