CN103913400A - Emulsion concentration on-line detection method based on density variation - Google Patents
Emulsion concentration on-line detection method based on density variation Download PDFInfo
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- CN103913400A CN103913400A CN201410103836.4A CN201410103836A CN103913400A CN 103913400 A CN103913400 A CN 103913400A CN 201410103836 A CN201410103836 A CN 201410103836A CN 103913400 A CN103913400 A CN 103913400A
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Abstract
The invention relates to an emulsion concentration on-line detection method based on density variation, which comprises the following steps: 1)determining a standard curve; 2)detecting the density of an emulsion to be measured; 3)detecting the temperature of the emulsion to be measured; 4)resolving the concentration of the emulsion, and compensating temperature; and 5) performing data communication and publishing the measure result. The emulsion concentration on-line detection method has the advantages that the measure precision is high, the measure repeatability is good, and influence due to temperature is little, by employing a flow measure method that an emulsion is flowed through a sensor, the problem that large deviation of the result due to lens pollution by a refractometry method is not existed, and the long-term stability of the on-line detection method is better.
Description
Technical field
The present invention relates to a kind of concentration of emulsion used online test method, especially the online detection of concentration of emulsion used for coal mine hydraulic supporting.
Background technology
Emulsion is that a kind of oil emulsion or concentrate mix with water, and oil molecule ambient water molecule wraps up round and round, is suspended in water and the mixed liquor that forms.As the actuating medium of hydraulic system, the parameter of emulsion, especially concentration, have a great impact for system performance, and excessive concentration easily causes seal failure, and emulsion leaks.The too low corrosion resistivity that easily causes again of concentration reduces, and hydraulic unit corrosion, finally causes thrashing.Therefore the online detection of concentration of emulsion used and control become and become more and more important.
In current actual production, be mainly also to adopt Refractometer to carry out offline inspection for the detection means of concentration of emulsion used.Specific practice is hand sampling from liquid-supplying system, waters and pours on hand-held saccharimeter eyeglass, and the scale of then observing interphase place from eyepiece carries out artificial reading.This method exists measures inaccurate, inconvenient problem, cannot realize the line closed loop control of concentration of emulsion used.
Examine online side for realizing concentration of emulsion used, scientific worker had once carried out various trials both at home and abroad.As light transmission method, electromagnetic wave attenuation method, ultrasonic velocity method, refractometry etc.Front several method is not badly applied because of the linearity and repeatability.Refractometry has been obtained certain success.The online refractometer of the company such as PL & A, German SCHMIDT+HAENSCH (being called for short S+H), Britain K-Patents of Australia.The strong innovation in domestic sky, Beijing, has released the online detecting sensor of a concentration of emulsion used based on refractometry principle.But this series products generally encountered again measurement camera lens and be not easy to clean in the time of down-hole application, when product long-term work, cause measurement result deviation too large because emulsion saponification, precipitate are deposited on measuring prism, and cannot meet the problem of rig-site utilization.
Summary of the invention
This patent has successfully been invented the concentration of emulsion used online test method based on density variation.Through experimental determination, oil emulsion or concentrate and glassware for drinking water have the poor (0.02-0.2g/cm of original density
3, slightly variant with the difference of brand, model, temperature), be made into emulsion after its density-concentration there is linear relationship, as shown in Figure 2.Therefore accurately measuring emulsion density, temperature just can unique concentration of emulsion used that calculates.
This online test method comprises: step 1, and standard curve determination, step 2, emulsion Density Detection to be measured, step 3, emulsion temperature detection to be measured, step 4, concentration of emulsion used resolves, the trip temperature of going forward side by side compensation, step 5, data communication, measurement result is issued.
Wherein step 1, standard curve determination.Adopt electronic balance (precision: 0.001g) to weigh the quality of oil emulsion or concentrate and water, take 1% as concentration gradient, being equipped with concentration is 0%, 1%, 2% ... 8 standard models of 7%.Then measure respectively and record each sample take 5 ℃ as thermograde, the density value (precision: 0.0001g/cm in 0-60 ℃ of (precision: 0.01 ℃) variation range
3), finally by the data acquisition recording least square method binomial fitting, obtain typical curve and quadratic term thereof, once, three parameter (precision: 0.00001) of constant term.
Step 2, adopts high precision density detection module on-line measurement emulsion density, and measurement result unit is g/cm
3, provide 4 position effective digitals after radix point, be accurate to 0.0001g/cm
3.
Step 3, adopts high-precision temperature detection module on-line measurement emulsion temperature, and measurement result unit is ℃, provides 2 position effective digitals after radix point, is accurate to 0.01 ℃.
Step 4, concentration is resolved.The typical curve that the density value recording according to step 2, three and concentration value result and step 1 record carries out data solver and temperature compensation, obtains concentration of emulsion used.
Step 5, by standard data communications means, carries out result issue by the concentration value recording.
Described high precision density detection module, having adopted the model of Austrian Anton Paar (Anton Paar) company is L-Dens312OEM module.It adopts U-shaped pipe succusion to measure fluid density, but this is an application example of this method, and all the other similar density measure modules are all subject to this patent protection.
Described high-precision temperature detection module, adopts the Pt100 platinum resistance temperature sensor being built in L-Dens312OEM module.
Described standard traffic means, have adopted RS485 interface, ModbusRTU communication protocol.But this is an application example of this method, all the other similar communication interfaces and agreement (such as RS232, electric current loop, Ethernet) are all subject to this patent protection.
The invention has the advantages that:
1, measuring accuracy is high, and concentration detects absolute precision can reach 0.2%;
2, measuring repeatability is good, and definitely repeatability reaches 0.1%;
3, temperature influence is little, and when designed temperature compensation algorithm guarantees that temperature changes within the scope of 0-60 ℃, measurement result deviation is less than 0.2%;
4, adopt the flow through flow measurement method of sensor of emulsion, do not exist refractometry to cause because camera lens pollutes the problem that result error is too large, long-time stability are better.
Accompanying drawing explanation
Accompanying drawing 1 is concentration of emulsion used online test method schematic diagram of the present invention;
Concentration of emulsion used and density relationship that accompanying drawing 2 is made into for conventional oil emulsion (concentrate);
The densimetry concentration of emulsion used sensor model machine hardware block diagram of accompanying drawing 3 for developing according to the method;
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.As shown in Figure 3, a kind of concentration of emulsion used on-line measuring device based on density variation, comprising: Density Detection module, temperature detecting module, central primary control plate, data communication interface.
Wherein to adopt the model of Austrian Anton Paar (Anton Paar) company be L-Dens312OEM module to Density Detection module, and it adopts U-shaped pipe succusion to measure fluid density.The unit of providing is g/cm
3the fluid density value that comprises 4 position effective digitals after radix point.
Wherein temperature detecting module adopts the Pt100 platinum resistance temperature sensor being built in L-Dens312OEM module to realize.
Wherein central primary control plate adopts the embedded system that LPC1758 is core.It,, by serial ports peripheral hardware Connection Density detection module, obtains the density value and the temperature value that measure; Software by sensor parameters out of typical curve matching, concentration solution formula, temperature compensation algorithm is all carried out on this master control borad, density by each measurement and temperature value calculate the concentration of liquid to be measured, finally by data communication interface form and agreement in accordance with regulations, measurement result are released.
Wherein data communication interface adopts hardware interface and the ModbusRTU software protocol of RS485 standard.The data of issuing can be resolved by the equipment of this interface of any support and agreement, show.
The flow process of test as shown in Figure 1.The test result contrast of the conventional refractometry product in concrete test case and densimetry model machine and market is as follows:
First be MS10-5 (G) type concentrate (a kind of conventional Emulation Concentration in Coal Mine) and clear water with the trade mark of utmost point rope brand, adopt electronic balance to be accurate to the quality of 0.001g weighing oil and water, configuration 1%-7%, take 1% 7 kinds of standard model liquid as concentration gradient.And record the actual concentration (being accurate to 0.001%) of every kind of sample.Then sample concentration is measured at 20 ℃ of identical environment temperatures with the refractometry product of the densimetry model machine described in this patent and market routine respectively.Finally by the outcome record recording in following table.
Measurement result can form many curves (also comprising the data of the brand such as Kui Ke, FOX in accompanying drawing 2) as shown in Figure 2 according to different temperature.
In use, by the emulsion density of actual measurement and temperature value substitution, choose the typical curve at temperature immediate with it according to the temperature of actual measurement, obtain the concentration of emulsion used value in curve according to the emulsion density of actual measurement.
Result shows, is better than market refractometry product at above-mentioned measuring condition lower density method model machine for emulsion sample concentration accuracy of detection open-wire line.The former maximum error of measuring is 0.068%, and the latter's maximum error of measuring reaches-0.807%.
The above; it is only preferably embodiment of patent of the present invention; the protection domain of patent of the present invention is not limited to this; anyly be familiar with in technical scope that those skilled in the art disclose in patent of the present invention; the variation that can expect easily or replacement, within all should being encompassed in the protection domain of patent of the present invention.
Claims (7)
1. the concentration of emulsion used online test method based on density variation, is characterized in that: the original density based on emulsion and water is poor, resolves concentration of emulsion used by measuring emulsion density, and described method comprises: step 1, standard curve determination; Step 2, emulsion Density Detection to be measured; Step 3, emulsion temperature detection to be measured; Step 4, concentration of emulsion used resolves, the trip temperature compensation deals of going forward side by side; Step 5, data communication, measurement result is issued.
2. the concentration of emulsion used online test method based on density variation as claimed in claim 1, it is characterized in that: wherein the standard curve determination in step 1 comprises: the quality that adopts electronic balance weighing emulsion and water, take 1% as concentration gradient, being equipped with concentration is 0%, 1%, 2%, ... 8 standard models of 7%, then measure respectively and record each sample take 5 ℃ as thermograde, density value in 0-60 ℃ of variation range, finally adopt binomial fitting method to carry out data fitting the result recording, obtain typical curve and quadratic term thereof, once item, three parameters of constant term.
3. the concentration of emulsion used online test method based on density variation as claimed in claim 1, it is characterized in that: wherein the emulsion Density Detection to be measured in step 2 comprises: adopt high precision density detection module on-line measurement emulsion density, measurement result unit is g/cm
3, provide 4 position effective digitals after radix point, be accurate to 0.0001g/cm
3.
4. the concentration of emulsion used online test method based on density variation as claimed in claim 1, it is characterized in that: wherein the emulsion temperature detection to be measured in step 3 comprises: adopt high-precision temperature detection module on-line measurement emulsion temperature, measurement result unit be ℃, provide 2 position effective digitals after radix point, be accurate to 0.01 ℃.
5. the concentration of emulsion used online test method based on density variation as claimed in claim 1, it is characterized in that: wherein step 4 comprises: carry out data solver and temperature compensation according to the typical curve recording in the density value recording in step 2, three and concentration value result and step 1, obtain concentration of emulsion used.
6. the concentration of emulsion used online test method based on density variation as claimed in claim 3, is characterized in that: it is L-Dens312OEM module that described high precision density detection module has adopted the model of Austrian Anton Paar (Anton Paar) company.
7. the concentration of emulsion used online test method based on density variation as claimed in claim 1, is characterized in that: described data communication adopts RS485 interface, ModbusRTU communication protocol.
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| CN201410103836.4A CN103913400A (en) | 2014-03-19 | 2014-03-19 | Emulsion concentration on-line detection method based on density variation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568658A (en) * | 2014-12-24 | 2015-04-29 | 正大青春宝药业有限公司 | Method for quickly detecting content of volatile matter in traditional Chinese medicinal steam distillate |
| CN105510182A (en) * | 2016-02-01 | 2016-04-20 | 雅化集团三台化工有限公司 | Method for rapidly measuring mass fraction of ammonium nitrate solution |
| CN111678877A (en) * | 2020-07-29 | 2020-09-18 | 深圳市长隆科技有限公司 | Water quality detection method and device for eliminating temperature influence and computer equipment |
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| CN1814986A (en) * | 2005-02-01 | 2006-08-09 | 石油大学(北京) | Method for overcomming creep of salt-rock layer by using ralation of drilling fluid density and chloride concentration |
| CN102135486A (en) * | 2010-12-22 | 2011-07-27 | 中国科学院山西煤炭化学研究所 | Method for quickly detecting concentration of polyacrylonitrile-based free radical coagulation bath |
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| US3981183A (en) * | 1974-10-03 | 1976-09-21 | Automation Products, Inc. | Method and apparatus for measuring a physical property of a fluid material that varies nonlinearly relative to the density of the fluid |
| CN1814986A (en) * | 2005-02-01 | 2006-08-09 | 石油大学(北京) | Method for overcomming creep of salt-rock layer by using ralation of drilling fluid density and chloride concentration |
| CN102135486A (en) * | 2010-12-22 | 2011-07-27 | 中国科学院山西煤炭化学研究所 | Method for quickly detecting concentration of polyacrylonitrile-based free radical coagulation bath |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568658A (en) * | 2014-12-24 | 2015-04-29 | 正大青春宝药业有限公司 | Method for quickly detecting content of volatile matter in traditional Chinese medicinal steam distillate |
| CN105510182A (en) * | 2016-02-01 | 2016-04-20 | 雅化集团三台化工有限公司 | Method for rapidly measuring mass fraction of ammonium nitrate solution |
| CN111678877A (en) * | 2020-07-29 | 2020-09-18 | 深圳市长隆科技有限公司 | Water quality detection method and device for eliminating temperature influence and computer equipment |
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