CN108414400B - Oil product viscosity determination method and system - Google Patents
Oil product viscosity determination method and system Download PDFInfo
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- CN108414400B CN108414400B CN201810354739.0A CN201810354739A CN108414400B CN 108414400 B CN108414400 B CN 108414400B CN 201810354739 A CN201810354739 A CN 201810354739A CN 108414400 B CN108414400 B CN 108414400B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/02—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material
- G01N11/04—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture
Abstract
The invention discloses a method and a system for judging oil viscosity, which adopt a flow, temperature and pressure (or differential pressure) monitoring technology to directly acquire the flow, temperature and working pressure of an oil product on line. Has the advantages of simple method and strong practicability.
Description
Technical Field
The invention relates to the judgment of the viscosity of oil products, which can be applied to equipment and industries needing to monitor and judge the viscosity or the fluidity of liquid.
Background
At present, viscosity values of oil products, particularly fuel oil, can be measured under laboratory conditions, and because China is a national condition of oil shortage, the fuel oil applied to combustion at present has variable properties and no relevant standard constraint, so that more uncontrollable factors are caused, and the viscosity of the fuel oil provided by a fuel supplier every time is uncertain.
Because of the extreme sensitivity to oil viscosity during combustion, various equipment burnout accidents often occur due to inadequate oil atomization viscosity, resulting in significant losses.
Oil viscosity solutions are not generally available in fuel equipment, and viscosity data can only be obtained by professional third party testing. The mode can not meet the national requirements of variable oil properties at all.
Disclosure of Invention
The invention aims to provide a method and a system for judging the viscosity of an oil product, which are simple and have strong practicability.
In order to achieve the purpose, the invention adopts the following technical scheme:
the method for judging the viscosity of the oil product is realized by the following steps:
s1: respectively measuring the flow q of the oilmCalculating the outflow coefficient C of the oil product corresponding to the throttling device by matching the temperature of the oil product and the differential pressure delta p of the oil product before and after the throttling device with the formula (1);
wherein β is the aperture ratio of the throttling device; epsilon is an expansibility coefficient, an oil product is an incompressible liquid, and epsilon takes the value of 1; pi is the circumference ratio; d is the diameter of the throat of the throttling device;
s11, reducing the formula (1) into a formula (2):
wherein q ismIs the flow of the oil product; k is a constant representing all invariants in formula (1); delta p is the differential pressure of the oil before and after the throttling device; t is the temperature of the oil at the time of measurement; t2 refers to another temperature of the oil; rhot2Refers to the density of the oil at the temperature of t 2; α is a coefficient;
s12: the constraint relation between the temperature of the oil product and the density of the oil product is expressed as a formula (3);
ρ1＝ρt2-α(t-t2) (3)
wherein t is the temperature of the oil during measurement; ρ 1 is the density of the oil at the time of measurement; t2 refers to another temperature of the oil; rhot2Refers to the density of the oil at the temperature of t 2; α is a coefficient;
s13: respectively measuring the density rho of the oil product at the temperature of t2t2Substituting the density rho 1 of the oil product at the temperature t into the formula (3), and calculating to obtain a coefficient alpha;
s14: the constant K, the differential pressure delta p of the oil before and after the throttling device and the density rho of the oil at the temperature of t2 are measuredt2Substituting the coefficient alpha and the temperature t2 into the formula (2), and measuring the flow q of the oil product on linemAnd the temperature t of the oil product, namely the outflow coefficient C can be obtained by calculation;
s2, calculating the Reynolds number Re of the oil product flowing through the throttling device by the Reed-Harris/Galahach formula according to the outflow coefficient C obtained in the step S1d；
S3 according to Reynolds number RedAnd dynamic viscosity eta1Using the Reynolds number Re obtained in step S2dCalculating the dynamic viscosity eta of the oil product under the working condition1。
In the step S1, the flow rate q of the oil productmThe temperature of the oil product and the differential pressure delta p of the oil product before and after the throttling device are measured in an online mode, the measured result is transmitted to a control device, an analysis module is arranged in the control device, and the analysis module is respectively preset with parameter conversion analysis software corresponding to a formula (1) and a Reed-Harris/Galahach formula and is used for converting a Reynolds number RedAnd dynamic viscosity eta1The dynamic viscosity eta of the oil product is analyzed and calculated by the control device1。
The output end of the control device is connected with a dynamic viscosity eta used for displaying oil products1The display device of (1).
The analysis module is internally preset with a set range value of the dynamic viscosity of the oil product, the output end of the control device is connected with an alarm device, and the dynamic viscosity eta obtained after the analysis and calculation of the control device1If the value exceeds the set range value, the alarm device gives an alarm.
The judging system applying the judging method comprises a flowmeter, a throttling device arranged in an oil pipe, a temperature sensor, a pressure or differential pressure sensor and a control device; the flow meter is connected to an oil path of the oil pipe, sensing probes of the pressure or differential pressure sensor are arranged in the oil pipe and are respectively positioned at the front and the rear of the throttling device, and the sensing probe of the temperature sensor is arranged in the oil pipe; the output end of the flowmeter, the output end of the temperature sensor and the output end of the pressure or differential pressure sensor are respectively connected to the corresponding input ends of a control device, an analysis module is arranged in the control device, and the analysis module is respectively preset with parameter conversion analysis software corresponding to the formula (2) and the Reed-Harris/Galahach formula and used for converting Reynolds number RedAnd dynamic viscosity eta1The dynamic viscosity eta of the oil product is analyzed and calculated by the control device1。
The output end of the control device is connected with a dynamic viscosity eta used for displaying oil products1The display device of (1).
The analysis module is internally preset withThe output end of the control device is connected with an alarm device, and the dynamic viscosity eta obtained after the analysis and calculation of the control device1If the value exceeds the set range value, the alarm device gives an alarm.
After the technical scheme is adopted, the method and the system for judging the viscosity of the oil product can directly acquire the flow, the temperature and the working pressure of the oil product on line continuously in real time by adopting the flow, temperature and pressure (or differential pressure) monitoring technology, and the viscosity value of the oil product can be converted by measuring the flow, the pressure (or differential pressure) and the temperature of the oil product because the viscosity of the oil product has a functional relation with the flow, the pressure (or differential pressure) and the temperature. The method has the advantages of simplicity and strong practicability.
Furthermore, the oil viscosity display device is provided with a display device, can display the dynamic viscosity of oil products in real time, and is visual and convenient.
Furthermore, the oil viscosity monitoring device is provided with an alarm device, and when the dynamic viscosity of the oil exceeds a set value, alarm prompt can be performed.
Furthermore, by utilizing the judgment result of the invention and controlling the heater of the fuel equipment by the control device, the temperature of the oil product is in a certain range, so that the viscosity of the oil product is stabilized in a certain range, and the combustion is prevented from working under the bad working condition.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
fig. 2 is a schematic view of the working process of the present invention.
Detailed Description
In the present invention, the dynamic viscosity eta of the oil product1Flow q through the oilmThe temperature of the oil product and the differential pressure delta p of the oil product before and after the throttling device.
As an optimized scheme, referring to FIG. 1 and FIG. 2, the method for determining the viscosity of the oil product of the present invention is implemented by the following steps:
s0: setting basic structure size of the throttling device and structure characteristic parameters of the throttling device;
s1: respectively measuring the flow q of oil products on linemCalculating the outflow coefficient C of the oil product corresponding to the throttling device by matching the temperature of the oil product and the differential pressure delta p of the oil product before and after the throttling device with the formula (1);
wherein β is the aperture ratio of the throttling device; epsilon is an expansibility coefficient, an oil product is an incompressible liquid, and epsilon takes the value of 1; pi is the circumference ratio; d is the diameter of the throat of the throttling device; wherein epsilon is a fixed value 1, beta and d are basic structure size parameters of the throttling device, and when the throttling device is selected, beta and d are also fixed values;
s11, reducing the formula (1) into a formula (2):
wherein q ismIs the flow of the oil product; k is a constant representing all invariants in formula (1); delta p is the differential pressure of the oil before and after the throttling device; t is the temperature of the oil at the time of measurement; t2 refers to another temperature of the oil; rhot2Refers to the density of the oil at the temperature of t 2; α is a coefficient;
s12: the constraint relation between the temperature of the oil product and the density of the oil product is expressed as a formula (3);
ρ1＝ρt2-α(t-t2) (3)
wherein t is the temperature of the oil during measurement; ρ 1 is the density of the oil at the time of measurement; t2 refers to another temperature of the oil; rhot2Refers to the density of the oil at the temperature of t 2; α is a coefficient;
s13: respectively measuring the density rho of the oil product at the temperature of t2t2Substituting the density rho 1 of the oil product at the temperature t into the formula (3), and calculating to obtain a coefficient alpha;
s14: substituting a constant K, differential pressure delta p of oil products before and after the throttling device, density rho 2 of the oil products at the temperature of t2, coefficient alpha and temperature t2 into a formula (2), and measuring the flow q of the oil products on linemAnd the temperature t of the oil, i.e. the temperatureCalculating to obtain the outflow coefficient C;
s2: according to the outflow coefficient C obtained in the step S1, the Reynolds number Re of the oil product flowing through the throttling device is calculated through the Reed-Harris/Galahach formulad；
The Reed-Harris/Galahach equation is as follows:
C＝0.5961+0.0261β2-0.216β8+0.000521(106β/ReD)0.7+(0.0188+0.0063A)β3.5(106/ReD)0.3+(0.043+0.080e-10L1-0.123e-7L1)(1-0.11A)β4/(1-β4)-0.031(M′2-0.8M′2 1.1)β1.3
link from China traffic networkhttp：//www.chinaflow.com.cn/basic/chayal1-9.htmIt can be seen that in the Reed-Harris/Galahach equation, except for the Reynolds number ReDBesides, the other parameters are related to the structure of the throttling device, and when the throttling device is selected, the parameters are constant values. The Reed-Harris/Galahach equation is well known in the art and the various parameters of the Reed-Harris/Galahach equation are not described here. It is only added here that R is the formula Reed-Harris/GalahacheDIn the present invention, D is the throat diameter D of the throttling device, and the Reynolds number is expressed as Red；
S3: according to Reynolds number RedAnd dynamic viscosity eta1Using the Reynolds number Re obtained in step S2dCalculating the dynamic viscosity eta of the oil product under the working condition1(ii) a Reynolds number RedAnd dynamic viscosity eta1Satisfies the formula (4):
Red＝4qm/(πη1d) (4)
wherein d is the diameter of the throat of the throttling device; q. q.smIs the flow of the oil product; and pi is the circumferential ratio.
Pi is a constant value, d is also a constant value when the throttle device is selected, and the Reynolds number Re obtained in step S2dThe flow q of the oil product is matched with the on-line measurementmCan be converted to obtain workThe dynamic viscosity of the oil is eta 1.
During operation, the flow q of oilmThe temperature of the oil product and the differential pressure delta p of the oil product before and after the throttling device are measured in an online mode, the measured result is transmitted to a control device, an analysis module is arranged in the control device, parameter conversion analysis software corresponding to a formula (1), a Reed-Harris/Galahach formula and a formula (4) is respectively preset in the analysis module, and the dynamic viscosity eta of the oil product is analyzed and calculated through the control device1。
The determination system applying the determination method comprises a volume type oil flow meter 1, a throttling device 2 arranged in an oil pipe 3, a control device 4, a pressure or differential pressure sensor 5 and a temperature sensor 6; the volumetric oil flowmeter 1 is connected to an oil path of an oil pipe 3, sensing probes of a pressure or differential pressure sensor 5 are arranged in the oil pipe 3 and are respectively positioned at the front and rear positions of the throttling device 2, and a sensing probe of a temperature sensor 6 is arranged in the oil pipe 3; the output end of the volumetric oil flowmeter 1, the output end of the temperature sensor 6 and the output end of the pressure or differential pressure sensor 5 are respectively connected to the corresponding input ends of the control device 4, an analysis module is arranged in the control device 4, the analysis module is respectively preset with parameter conversion analysis software corresponding to the formula (2), the Reed-Harris/Galahach formula and the formula (4), and the dynamic viscosity eta of the oil product is analyzed and calculated by the control device 41。
The oil viscosity judging method and system of the invention adopts flow, temperature and pressure (or differential pressure) monitoring technology, can directly acquire the flow, temperature and working pressure of the oil on line, and can convert the viscosity value of the oil by measuring the flow, pressure (or differential pressure) and temperature of the oil because the viscosity of the oil has a functional relation with the flow, pressure (or differential pressure) and temperature.
In the invention, the output end of the control device 4 can be connected with a display device for displaying the dynamic viscosity eta of the oil product1The display device can display the dynamic viscosity of the oil product in real time, and is visual and convenient.
In the invention, a set range value of the dynamic viscosity of the oil product can be preset in the analysis module of the control device 4,the output end of the control device 4 is connected with an alarm device, and the dynamic viscosity eta obtained after the analysis and calculation of the control device 41If the value exceeds the set range value, the alarm device gives an alarm.
Furthermore, by utilizing the judgment result of the invention and controlling the heater of the fuel equipment through the control device, the temperature of the oil product can be in a certain range, so that the viscosity of the oil product can be stabilized in a certain range, and the combustion is prevented from working under the bad working condition.
In the invention, the corresponding outflow coefficient C of the throttling device with a specific structure is a fixed value, and the change of the C value of the same oil product after calibration is considered to be known. After the new oil product is replaced, the C value is changed, and the dynamic viscosity of the new oil product can be obtained through the change comparison. Based on the principle, the method for obtaining the dynamic viscosity of the oil product by comparing with the working condition under the guidance of the design idea of the invention is also the protection scope of the invention. The dynamic viscosity of the oil product is obtained by comparing with the working condition, so that the calculation can be simplified, and meanwhile, the calculation accuracy is improved.
Claims (6)
1. The method for judging the viscosity of the oil product is characterized by comprising the following steps of:
s1: respectively measuring the flow q of the oilmCalculating the outflow coefficient C of the oil product corresponding to the throttling device by matching the temperature of the oil product and the differential pressure delta p of the oil product before and after the throttling device with the formula (1);
wherein β is the aperture ratio of the throttling device; epsilon is an expansibility coefficient, an oil product is an incompressible liquid, and epsilon takes the value of 1; pi is the circumference ratio; d is the diameter of the throat of the throttling device;
s11, reducing the formula (1) into a formula (2):
wherein q ismIs the flow of the oil product; k is a constant representing all invariants in formula (1); delta p is the differential pressure of the oil before and after the throttling device; t is the temperature of the oil at the time of measurement; t2 refers to another temperature of the oil; rhot2Refers to the density of the oil at the temperature of t 2; α is a coefficient;
s12: the constraint relation between the temperature of the oil product and the density of the oil product is expressed as a formula (3);
ρ1＝ρt2-α(t-t2) (3)
wherein t is the temperature of the oil during measurement; ρ 1 is the density of the oil at the time of measurement; t2 refers to another temperature of the oil; rhot2Refers to the density of the oil at the temperature of t 2; α is a coefficient;
s13: respectively measuring the density rho of the oil product at the temperature of t2t2Substituting the density rho 1 of the oil product at the temperature t into the formula (3), and calculating to obtain a coefficient alpha;
s14: the constant K, the differential pressure delta p of the oil before and after the throttling device and the density rho of the oil at the temperature of t2 are measuredt2Substituting the coefficient alpha and the temperature t2 into the formula (2), and measuring the flow q of the oil product on linemAnd the temperature t of the oil product, namely the outflow coefficient C can be obtained by calculation;
s2, calculating the Reynolds number Re of the oil product flowing through the throttling device by the Reed-Harris/Galahach formula according to the outflow coefficient C obtained in the step S1d；
S3 according to Reynolds number RedAnd dynamic viscosity eta1Using the Reynolds number Re obtained in step S2dCalculating the dynamic viscosity eta of the oil product under the working condition1；
In the step S1, the flow rate q of the oil productmThe temperature of the oil product and the differential pressure delta p of the oil product before and after the throttling device are measured in an on-line mode, the measurement result is transmitted to a control device, an analysis module is arranged in the control device, and the analysis module is respectively preset with parameter conversion analysis software corresponding to a formula (2) and a Reed-Harris/Galahach formula and is used for converting a Reynolds number RedIs adhered with powerDegree eta1The dynamic viscosity eta of the oil product is analyzed and calculated by the control device1。
2. An oil viscosity determination method according to claim 1, characterized in that: the output end of the control device is connected with a dynamic viscosity eta used for displaying oil products1The display device of (1).
3. An oil viscosity determination method according to claim 1, characterized in that: the analysis module is internally preset with a set range value of the dynamic viscosity of the oil product, the output end of the control device is connected with an alarm device, and the dynamic viscosity eta obtained after the analysis and calculation of the control device1If the value exceeds the set range value, the alarm device gives an alarm.
4. A determination system to which the determination method according to claim 1 is applied, characterized in that: the device comprises a flowmeter, a throttling device arranged in an oil pipe, a temperature sensor, a pressure or differential pressure sensor and a control device; the flow meter is connected to an oil path of the oil pipe, sensing probes of the pressure or differential pressure sensor are arranged in the oil pipe and are respectively positioned at the front and the rear of the throttling device, and the sensing probe of the temperature sensor is arranged in the oil pipe; the output end of the flowmeter, the output end of the temperature sensor and the output end of the pressure or differential pressure sensor are respectively connected to the corresponding input ends of a control device, an analysis module is arranged in the control device, and the analysis module is respectively preset with parameter conversion analysis software corresponding to the formula (2) and the Reed-Harris/Galahach formula and used for converting Reynolds number RedAnd dynamic viscosity eta1The dynamic viscosity eta of the oil product is analyzed and calculated by the control device1。
5. The determination system according to claim 4, wherein: the output end of the control device is connected with a dynamic viscosity eta used for displaying oil products1The display device of (1).
6. The determination system according to claim 4, wherein: the analysis module is internally preset with a set range value of the dynamic viscosity of the oil product, the output end of the control device is connected with an alarm device, and the dynamic viscosity eta obtained after the analysis and calculation of the control device1If the value exceeds the set range value, the alarm device gives an alarm.
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