CN104374444A - Indirect metering method and device for samples injected without passing mass flow meter - Google Patents
Indirect metering method and device for samples injected without passing mass flow meter Download PDFInfo
- Publication number
- CN104374444A CN104374444A CN201410631666.7A CN201410631666A CN104374444A CN 104374444 A CN104374444 A CN 104374444A CN 201410631666 A CN201410631666 A CN 201410631666A CN 104374444 A CN104374444 A CN 104374444A
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- solenoid valve
- mass flowmeter
- outlet
- sample introduction
- mass flow
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Abstract
The invention provides an indirect metering method and device for samples injected without passing a mass flow meter. The method and device mainly solve the problems that when an existing sample injector analyzes trace impurities, the trace impurities are easily adsorbed to the inner wall of the mass flow meter, so that the analysis period is too long, capillary tubes of the mass flow meter are blocked, and then metering operation cannot be achieved. The method and device are characterized in that the mass flow meter is connected to an emptying passage, when injected, the samples firstly pass the emptying passage, a flow control valve is controlled to set the flow rate at a certain fixed value and set the metering flow rate as mu0, a sample injection state is switched into, initial time is recorded as T0, an emptying state is switched into after the samples are injected, end time is recorded as T1, and the metering flow rate is recorded as mu1; the sample injection volume V is calculated according to the formula V=(T1-T0) * (mu1+mu0) /2. By the adoption of the metering method and device, the mass flow meter is arranged on the emptying passage, a filter is additionally arranged at the front end of the mass flow meter, a system is prevented from being blocked, and the sample injection volume can be accurately metered.
Description
Technical field
The present invention relates to chemical field, a kind of sample is without the indirect metering method of mass flowmeter sample introduction and device specifically.
Background technology
Current injector be through mass flowmeter metering flow velocity after sample introduction again, although accurate measurement, but there is following problem when being applied to and analyzing trace impurity: the first, mass flowmeter cavity inner wall is stainless steel polar surfaces, easily to trace impurity absorption or desorption, make analytical cycle long; The second, the micro-solid granulates contained in sample or oil droplet can make the core measuring unit-kapillary blocking of mass flowmeter, cause system to work, if add filtrator before mass flowmeter, can have a strong impact on analysis result.
Summary of the invention
In order to overcome existing injector when analyzing trace impurity mass flowmeter inwall easy adsorb traces impurity and make that analytical cycle is long, the blocking of mass flowmeter kapillary and unmeasurable deficiency, the invention provides the indirect metering method device of a kind of sample without mass flowmeter sample introduction, mass flowmeter is arranged on emptying path by this measuring apparatus, fixed filter is added in mass flowmeter front end, avoid system jams, and can metering sample feeding volume accurately.
Technical scheme of the present invention is: mass flowmeter, without the indirect metering method of mass flowmeter sample introduction, is connected on emptying path by a kind of sample, and during sample introduction, get ahead emptying path, and flow rate set in a certain fixed value, is measured flow velocity μ by control flow check adjustable valve
0; Be switched to sample introduction state, record start time T
0, be switched to emptying state after sample introduction terminates, end of record (EOR) time T
1, metering flow velocity μ
1; Calculate sampling volume V=(T
1-T
0) * (μ
1+ μ
0)/2.
A kind ofly apply the device of above-mentioned sample without the indirect metering method of mass flowmeter sample introduction, comprise liquid hydrocarbon interface, drain, injection port, mass flowmeter, described liquid hydrocarbon interface connects flash vaporized unit, the outlet connection traffic variable valve of flash vaporized unit, the outlet connecting tee of flow control valve, an outlet of threeway is connected with the normally closed port A of anti-suck solenoid valve, another outlet is connected with the normal opening E of two-bit triplet solenoid valve, the common port F of two-bit triplet solenoid valve connects filtrator, the outlet quality of connection flowmeter of filtrator, the outlet of mass flowmeter is connected with drain, the common port C of described anti-suck solenoid valve is connected with injection port, the normally closed port D of described two-bit triplet solenoid valve is connected with air pump.
The present invention has following beneficial effect: owing to taking such scheme, this measuring apparatus is divided into emptying path and sample introduction path by anti-suck solenoid valve and two-bit triplet solenoid valve, and mass flowmeter is placed on emptying path, fixed filter is added in mass flowmeter front end, the interference that mass flowmeter inwall impurity absorption or desorption can be avoided to analyze trace impurity, avoids system jams.When flow speed stability, be switched to sample introduction path, make it with same flow velocity sample introduction, like this by time cumulation metered volume, can metering sample feeding volume accurately.Meanwhile, mass flowmeter front end connects air pump, purges, can prevent mass flowmeter long-term work kapillary from blocking to mass flowmeter.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
1-liquid hydrocarbon interface in figure, 2-drain, 3-injection port, the flash vaporized unit of 4-, 5-anti-suck solenoid valve, 6-mass flowmeter, 7-flow control valve, 8-two-bit triplet solenoid valve, 9-air pump, 10-filtrator, 11-threeway.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1, a kind of sample is without the indirect metering method of mass flowmeter sample introduction, mass flowmeter is connected on emptying path, during sample introduction, get ahead emptying path, drive flow control valve 7 to rotate coutroi velocity in setting value by stepper motor, then stop stepper motor rotating, the flow velocity μ of metered mass flowmeter
0, be switched to sample introduction state, remember initial time T
0, after sample introduction terminates, be switched to emptying, remember end time T
1, the flow velocity μ of metered mass flowmeter
1, calculate sampling volume V=(T
1-T
0) * (μ
1+ μ
0)/2.Produce error in order to avoid the flow on emptying path and the flow on sample introduction path because of structural pipeline different, we are by the method validation recovery of weighing, and on instrument, arrange a correction factor σ.Such as: before sample introduction, the quality weighing liquid hydrocarbon steel cylinder is m
0, after sample introduction terminates, weigh the quality m of liquid hydrocarbon steel cylinder
1, the quality of so true sample introduction is m=m
0-m
1; Again according to sample introduction cumulative volume (V) * sample injection time (T) * density (ρ)=m
3, so correction factor σ=m/m
3.Usually different mass flowmeters has different conversion coefficient ξ for different media, sample volume V
1=V* ξ, wherein ξ is the conversion coefficient of mass flowmeter, sample quality M
1=V
1* ρ, wherein ρ is sample rate, revised sample quality M=M
1* σ.
Such as: when using LG-8 type liquid hydrocarbon flash distillation sampling injector, the conversion coefficient of kind of the gas mass flow of 60 in mass flowmeter form all stored in the inside.Such as our propylene of often doing, as long as select propylene in kind menu, the conversion coefficient ξ of known propylene is 0.698, so when sample introduction, automatically can calculate corresponding propylene volume V
1(propylene volume V
1the conversion coefficient ξ of=cumulative volume V * propylene), the mass M of propylene
1(the mass M of propylene
1=propylene volume V
1* propylene density 1.9670), amended mass M=M
1* σ.
Said method can adopt and realize with lower device, a kind of sample is without the indirect measuring apparatus of mass flowmeter sample introduction, comprise liquid hydrocarbon interface 1, drain 2, injection port 3, mass flowmeter 6, described liquid hydrocarbon interface 1 bathes flash vaporized unit 4 by stainless-steel tube connection metal, the outlet connection traffic variable valve 7 of flash vaporized unit 4, flow control valve is driven by Single-chip Controlling stepper motor, and liquid hydrocarbon such as to change at the gaseous sample of composition after flash vaporized unit 4 and flow control valve 7.The outlet connecting tee 11 of flow control valve 7, an outlet of threeway 11 is connected with the normally closed port A of anti-suck solenoid valve 5, another outlet is connected with the normal opening E of two-bit triplet solenoid valve 8, the common port F of two-bit triplet solenoid valve 8 connects filtrator 10 entrance, outlet quality of connection flowmeter 6 entrance of filtrator 10, the outlet of mass flowmeter 6 is connected with drain 2; The common port C of described anti-suck solenoid valve 5 is connected with injection port 3; The normally closed port D of described two-bit triplet solenoid valve 8 is connected with air pump 9.
This measuring apparatus is controlled by anti-suck solenoid valve 5 and two-bit triplet solenoid valve 8, can be divided into three paths, is respectively emptying path, sample introduction path and cleaning quality flowmeter path.
When emptying state, emptying path walked by sample, and anti-suck solenoid valve 5 does not power on, and now common port C meets normal opening B, and two-bit triplet solenoid valve 8 does not power on, and common port F meets normal opening D, and air pump 9 does not power on (being separated by with air).Liquid hydrocarbon interface 1 connects flash vaporized unit 4 entrance, flash vaporized unit 4 outlet connects flow control valve 7, flow control valve 7 exports threeway 11, the normally closed port A of suck-back solenoid valve 5 is taken over control in threeway 11 1 outlets, because anti-suck solenoid valve 5 does not power on, normally closed port A is blocked state, so dead end.Another outlet of threeway 11 meets the normal opening E of two-bit triplet solenoid valve 8, because two-bit triplet solenoid valve 8 does not power on, normal opening E is connected with common port F, enter into filtrator 10 through common port F, then enter mass flowmeter 6 by filtrator 10, the outlet of mass flowmeter 6 connects drain 2.Summing up gas circuit trend is: liquid hydrocarbon interface 1 → gasification unit 4 → flow control valve 7 → threeway 11 → two-bit triplet solenoid valve 8 → filtrator 10 → mass flowmeter 6 → drain 2.Now, adjust flux variable valve 7, when after flow speed stability, makes flow control valve 7 remain on same flow velocity, is then switched to sample introduction state.
When sample introduction state, sample introduction path walked by sample, and anti-suck solenoid valve 5 powers on, and common port C meets normally closed port A, and two-bit triplet solenoid valve 8 powers on, and common port F meets normally closed port D, and air pump does not power on (being separated by with air).Liquid hydrocarbon interface 1 connects flash vaporized unit 4 entrance, flash vaporized unit 4 outlet connects flow control valve 7, and flow control valve 7 exports threeway 11, and the normally closed port A of suck-back solenoid valve 5 is taken over control in threeway 11 1 outlets, because anti-suck solenoid valve 5 powers on, communicate with injection port 3 through common port C; Another outlet of threeway 11 meets the normal opening E of two-bit triplet solenoid valve 8, and because two-bit triplet solenoid valve 8 powers on, opening E is obstructed often for this.Summing up gas circuit trend is: liquid hydrocarbon interface 1 → gasification unit 4 → flow control valve 7 → threeway 11 → anti-suck solenoid valve 5 → injection port 3.
When cleaning quality flowmeter path, there is no sample, the heart starts the order of purging mass flowmeter in the controlling, two-bit triplet solenoid valve 8 powers on, common port F meets normally closed port D, air pump 9 powers on, and is inflated toward filtrator 10 by normally closed port D, the common port F of two-bit triplet solenoid valve 8 in air pump 9 gas outlet, reaches the object purging mass flowmeter 6.
Claims (2)
1. sample is without an indirect metering method for mass flowmeter sample introduction, it is characterized in that: be connected on by mass flowmeter on emptying path, and during sample introduction, get ahead emptying path, and flow rate set in a certain fixed value, is measured flow velocity μ by control flow check adjustable valve
0; Be switched to sample introduction state, record start time T
0, be switched to emptying state after sample introduction terminates, end of record (EOR) time T
1, metering flow velocity μ
1; Calculate sampling volume V=(T
1-T
0) * (μ
1+ μ
0)/2.
2. an application rights requires that described in 1, sample is without the device of the indirect metering method of mass flowmeter sample introduction, comprise liquid hydrocarbon interface (1), drain (2), injection port (3), mass flowmeter (6), it is characterized in that: described liquid hydrocarbon interface (1) connects flash vaporized unit (4), the outlet connection traffic variable valve (7) of flash vaporized unit (4), the outlet connecting tee (11) of flow control valve (7), an outlet of threeway (11) is connected with the normally closed port A of anti-suck solenoid valve (5), another outlet is connected with the normal opening E of two-bit triplet solenoid valve (8), the common port F of two-bit triplet solenoid valve (8) connects filtrator (10), the outlet quality of connection flowmeter (6) of filtrator (10), the outlet of mass flowmeter (6) is connected with drain (2), the common port C of described anti-suck solenoid valve (5) is connected with injection port (3), the normally closed port D of described two-bit triplet solenoid valve (8) is connected with air pump (9).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410631666.7A CN104374444B (en) | 2014-11-11 | 2014-11-11 | Sample without mass flowmenter sample introduction indirect metering method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410631666.7A CN104374444B (en) | 2014-11-11 | 2014-11-11 | Sample without mass flowmenter sample introduction indirect metering method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104374444A true CN104374444A (en) | 2015-02-25 |
| CN104374444B CN104374444B (en) | 2018-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410631666.7A Active CN104374444B (en) | 2014-11-11 | 2014-11-11 | Sample without mass flowmenter sample introduction indirect metering method and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108981835A (en) * | 2018-06-25 | 2018-12-11 | 威海拙诚燃气安全设备有限公司 | Utilize the method for the indirect metering gas usage amount of gaseous-pressure |
| CN112325952A (en) * | 2020-10-21 | 2021-02-05 | 北京航空航天大学 | Air flow measuring device flowing through rotary hole |
Citations (5)
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|---|---|---|---|---|
| CN2412218Y (en) * | 1999-11-05 | 2000-12-27 | 段景峰 | Flashing gasified sampling-fetching device for liquid hydrocarbon |
| CN101629936A (en) * | 2009-08-12 | 2010-01-20 | 上海华爱色谱分析技术有限公司 | Pulse helium ionized gas phase chromatographic instrument |
| CN101915817A (en) * | 2010-07-27 | 2010-12-15 | 麻红昭 | On-line liquid phase differential pressure automatic sample injector |
| WO2013181305A1 (en) * | 2012-05-31 | 2013-12-05 | Siemens Healthcare Diagnostics Inc. | Real time detection of aspiration short shots using pressure signal |
| CN203519571U (en) * | 2013-07-04 | 2014-04-02 | 浙江福立分析仪器有限公司 | Flash-evaporation gasification sampling device in gas chromatographic analyzer |
-
2014
- 2014-11-11 CN CN201410631666.7A patent/CN104374444B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2412218Y (en) * | 1999-11-05 | 2000-12-27 | 段景峰 | Flashing gasified sampling-fetching device for liquid hydrocarbon |
| CN101629936A (en) * | 2009-08-12 | 2010-01-20 | 上海华爱色谱分析技术有限公司 | Pulse helium ionized gas phase chromatographic instrument |
| CN101915817A (en) * | 2010-07-27 | 2010-12-15 | 麻红昭 | On-line liquid phase differential pressure automatic sample injector |
| WO2013181305A1 (en) * | 2012-05-31 | 2013-12-05 | Siemens Healthcare Diagnostics Inc. | Real time detection of aspiration short shots using pressure signal |
| CN203519571U (en) * | 2013-07-04 | 2014-04-02 | 浙江福立分析仪器有限公司 | Flash-evaporation gasification sampling device in gas chromatographic analyzer |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108981835A (en) * | 2018-06-25 | 2018-12-11 | 威海拙诚燃气安全设备有限公司 | Utilize the method for the indirect metering gas usage amount of gaseous-pressure |
| CN108981835B (en) * | 2018-06-25 | 2020-05-12 | 山东拙诚智能科技有限公司 | Method for indirectly measuring gas usage amount by gas pressure |
| CN112325952A (en) * | 2020-10-21 | 2021-02-05 | 北京航空航天大学 | Air flow measuring device flowing through rotary hole |
| CN112325952B (en) * | 2020-10-21 | 2021-07-13 | 北京航空航天大学 | Air flow measuring device flowing through rotary hole |
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| Publication number | Publication date |
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| CN104374444B (en) | 2018-01-05 |
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