CN113406274A - Mixing uniformity analysis method based on viscosity on-line detection and mixing device - Google Patents
Mixing uniformity analysis method based on viscosity on-line detection and mixing device Download PDFInfo
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Abstract
The invention discloses a mixing uniformity analysis method and a mixing device based on viscosity on-line detection, which are characterized in that viscosity values of oil-liquid mixtures of different levels in an oil-liquid mixing tank are monitored in real time, the uniformity of the oil-liquid mixtures is determined based on the monitored viscosity values of the oil-liquid mixtures, and finally whether the oil-liquid mixtures are uniformly mixed or not is judged according to the uniformity of the oil-liquid mixtures and a preset threshold value of the uniformity of the oil-liquid mixtures corresponding to the current temperature of the oil-liquid mixtures, namely, the monitoring of the mixing uniformity is carried out based on the performance parameters, namely the viscosity values, of the oil-liquid mixtures monitored in real time, so that the uniformity of the oil-liquid mixtures is improved, and the problem that various performance indexes of oil liquid can be influenced due to manual mixing of the oil is solved.
Description
Technical Field
The invention relates to the technical field of computers, in particular to a mixing uniformity analysis method and a mixing device based on viscosity on-line detection.
Background
The existing method for mixing various oil liquids mainly comprises the steps of manually mixing the oil liquids through operators, judging whether the oil liquids are uniformly mixed or not mainly based on mixing time determined by manual experience in the mixing process, but the mixing speeds and the mixing forces of different people have certain differences, so that various performance indexes of the oil liquids can be influenced by the existing method for mixing the oil liquids by relying on the experience of workers.
Disclosure of Invention
The invention provides a mixing uniformity analysis method and a mixing device based on viscosity online detection, and aims to solve the problem that performance indexes of oil-liquid mixtures are influenced by manually mixing oil-liquid in the prior art.
In a first aspect, the present invention provides a method for analyzing mixing uniformity based on viscosity online detection, the method comprising: injecting different preset oil liquids into an oil liquid mixing tank according to a preset proportion for mixing; monitoring viscosity values of oil-liquid mixtures at different levels in the oil-liquid mixing tank in real time, and determining the uniformity of the oil-liquid mixtures based on the viscosity values of the oil-liquid mixtures at different levels; according to the degree of consistency of the fluid mixture of different levels and the temperature of current fluid mixture, it is right the degree of consistency of fluid mixture carries out the analysis, and after the degree of consistency of fluid mixture reaches the predetermined fluid mixture degree of consistency threshold value that the temperature of current fluid mixture corresponds, then confirms fluid mixture misce bene.
Optionally, real-time supervision the viscosity number of the fluid mixture body of different levels in the fluid mixture jar includes: the viscosity sensor arranged on the oil mixing tank is used for monitoring the viscosity values of oil and liquid mixtures in different levels in the oil mixing tank in real time.
Optionally, the viscosity sensors are a plurality of, and the viscosity sensors are uniformly distributed in the kettle body of the oil mixing tank along the vertical direction, and are uniformly distributed on the vertical projection parallel to the axis of the kettle body.
Optionally, the number of the viscosity sensors is three, and the viscosity sensors are respectively a first viscosity sensor, a second viscosity sensor and a third viscosity sensor, the first viscosity sensor is located at the top of the kettle body of the oil mixing tank, the second viscosity sensor is located at the middle of the kettle body of the oil mixing tank, and the third viscosity sensor is located at the bottom of the kettle body of the oil mixing tank;
real-time supervision the viscosity number of the fluid mixture of different levels in the fluid blending tank includes:
monitoring viscosity values of oil liquid mixtures at different levels in the oil liquid mixing tank according to a preset period, and setting the viscosity value of the oil liquid mixture in the ith monitoring period to be Vi＝{Vui,Vmi,Vdi}, wherein: vuiIs the viscosity value, V, monitored by the first viscosity sensor in the ith monitoring periodmiIs the viscosity value, V, monitored by the second viscosity sensor in the ith monitoring perioddiIs the viscosity value monitored by the second viscosity sensor in the ith monitoring period;
the viscosity number of fluid mixture based on different levels is confirmed the degree of consistency of fluid mixture includes:
calculating the arithmetic mean value of the real-time viscosity value of the oil-liquid mixture
Respectively calculating the uniformity of the oil-liquid mixture at the top, the middle and the bottom in the kettle body based on the arithmetic mean value
Wherein j is u, m, d, CijFor the ith monitoring period, the homogeneity, V, of the mixed oil at the jth positionijThe viscosity value of the oil-liquid mixture is monitored in real time at the jth position in the ith monitoring period;
determining the real-time uniformity of the oil liquid mixture: ci＝maxCij＝max(Ciu Cim Cid) Wherein, CiuIs the real-time uniformity of the top in the kettle body, CimIs the real-time uniformity of the middle part in the kettle body, CidThe real-time uniformity of the bottom in the kettle body is obtained.
Optionally, according to the degree of consistency of the fluid mixture of different hierarchies and the temperature of current fluid mixture, it is right the degree of consistency of fluid mixture carries out the analysis, include:
based on the temperature of the current oil-liquid mixture and the corresponding relation between the preset temperature of the oil-liquid mixture and the threshold value of the uniformity of the oil-liquid mixture, the threshold value C of the uniformity of the oil-liquid mixture is determinedΔWhen C is presenti≤CΔAnd judging that the uniformity of the oil-liquid mixture meets the requirement, otherwise, continuing stirring until the uniformity meets the requirement.
Optionally, after monitoring viscosity values of oil and fluid mixtures at different levels in the oil and fluid mixing tank in real time, before determining uniformity of the oil and fluid mixtures based on the viscosity values of the oil and fluid mixtures at different levels, the method further includes:
judging whether the ratio of the difference value of the viscosity values of the oil-liquid mixture of any two levels to the average value of the viscosity values of all the levels is smaller than a preset first proportional threshold, and if so, further judging the viscosity value V of the oil-liquid mixture at the output end of the oil-liquid mixing tankoutThe difference value of the viscosity threshold value corresponding to the temperature of the current oil liquid mixture and the viscosityAnd whether the ratio of the threshold values is smaller than a preset second proportion threshold value or not, and if so, triggering the viscosity values of the oil-liquid mixture based on different levels to determine the uniformity of the oil-liquid mixture.
Optionally, the first ratio threshold, the second ratio threshold, and the uniformity threshold are all measured according to experiments.
In a second aspect, the present invention provides a mixing apparatus for carrying out any of the methods described above, the mixing apparatus comprising: the oil-liquid mixing device comprises an oil-liquid mixing tank, a plurality of oil-liquid input channels, an oil-liquid output channel and a controller, wherein the oil-liquid mixing tank is connected with the oil-liquid input channels and the oil-liquid output channels;
the oil liquid input channels are used for inputting a certain preset oil liquid into the oil liquid mixing tank according to a set flow speed and a set flow rate, wherein the input oil liquid corresponding to each oil liquid input channel is distributed according to a preset distribution rule;
the oil liquid mixing tank is used for mixing oil liquid input by different oil liquid input channels, monitoring the viscosity values of oil liquid mixtures of different levels in the kettle body in real time and sending the monitored viscosity values to the controller;
the controller is used for according to the viscosity number of the fluid mixture of different levels in the fluid blending tank is confirmed the degree of consistency of fluid mixture to the degree of consistency and the temperature of current fluid mixture according to the fluid mixture of different levels are right the degree of consistency of fluid mixture carries out the analysis, and after the degree of consistency of fluid mixture reaches the predetermined fluid mixture degree of consistency threshold value that the temperature of current fluid mixture corresponds, then confirms the fluid mixture misce bene.
Optionally, a kettle body is further arranged in the oil mixing tank, the kettle body is connected with the oil input channel and the oil output channel, a plurality of viscosity sensors are arranged in the kettle body, and a stirring paddle for stirring oil is also arranged in the kettle body;
the kettle body is used for mixing oil liquid input by different oil liquid input channels;
the viscosity sensor is used for monitoring the viscosity value of the oil liquid mixture in the kettle body in real time and sending the monitored viscosity to the controller for the controller to analyze the uniformity of the oil liquid mixture.
Optionally, the mixing device further comprises a heater, the heater further comprising an outer jacket and a heating rod; the outer jacket is arranged outside the oil mixing tank and used for preserving heat of the oil mixing tank; the heating rod is arranged in the kettle body and used for heating the oil liquid mixture in the kettle body according to preset conditions.
The invention has the following beneficial effects:
according to the invention, the viscosity values of the oil-liquid mixtures at different levels in the oil-liquid mixing tank are monitored in real time, the uniformity of the oil-liquid mixtures is determined based on the monitored viscosity values of the oil-liquid mixtures, and whether the oil-liquid mixtures are uniformly mixed is judged according to the uniformity of the oil-liquid mixtures and the preset threshold value of the uniformity of the oil-liquid mixtures corresponding to the temperature of the current oil-liquid mixtures.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic flow chart of a mixing uniformity analysis method based on viscosity on-line measurement according to an embodiment of the present invention;
fig. 2 is a schematic overall structure diagram of a mixing device for implementing a mixing uniformity analysis method based on viscosity online detection according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of an oil mixing tank according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the mounting positions of three viscosity sensors on a top-view projection of an oil mixing tank according to an embodiment of the present invention;
fig. 5 is a schematic layout position diagram of heat conduction fins and a liquid baffle of an oil mixing tank according to an embodiment of the present invention;
FIG. 6 is a steady state flow field diagram in a tank under operation provided by an embodiment of the present invention.
Description of the drawings: the system comprises an a-viscosity sensor, a 10-oil mixing tank, an 11-kettle body, a 12-outer jacket, a 13-heat conduction fin, a 14-heating rod, a 15-liquid baffle, a 16 a-stirring motor, a 16 b-stirring shaft, a 16 c-stirring paddle, a 21-oil pump, a 22-oil inlet sensor, a 23-exhaust valve, a 24-ball valve, a 25-oil inlet flow sensor, a 31-oil transfer pump, a 32-oil transfer flow sensor, a 33-oil transfer electromagnetic valve, a 34-pressure sensor before filtration, a 35-filter, a 36-pressure sensor after filtration and a 37-circulation electromagnetic valve.
Detailed Description
The embodiment of the invention aims at the problem that the performance index of the oil-liquid mixture is influenced by manually mixing the oil liquid, and the problems of large quantity of operators required for mixing the oil, high labor intensity, complicated mixing steps, low mixing efficiency and the like, the method comprises the steps of monitoring viscosity values of oil-liquid mixtures of different levels in an oil-liquid mixing tank in real time, determining the uniformity of the oil-liquid mixtures based on the monitored viscosity values of the oil-liquid mixtures, and finally judging whether the oil-liquid mixtures are uniformly mixed or not according to the uniformity of the oil-liquid mixtures and a preset oil-liquid mixture uniformity threshold value corresponding to the temperature of the current oil-liquid mixtures, namely, the method is based on the performance parameters of the oil-liquid mixtures monitored in real time, viscosity number promptly, carry out the monitoring of mixing uniformity to improve the homogeneity that the fluid mixture body mixes, in order to avoid carrying on the problem that fluid influences the various performance index of fluid because the manual work. The present invention will be described in further detail below with reference to the drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The first embodiment of the present invention provides a method for analyzing mixing uniformity based on viscosity on-line detection, referring to fig. 1, the method includes:
s101, injecting different preset oil liquids into an oil liquid mixing tank according to a preset proportion for mixing;
namely, the different preset oil liquids according to the embodiment of the invention are injected into the oil liquid mixing tank according to the preset proportion, and the oil liquid mixture in the oil liquid mixing tank is finally uniformly mixed through the stirring operation in the oil liquid mixing tank.
It should be noted that the preset oil according to the embodiment of the present invention may be various oils to be mixed, and in the specific implementation, different oils are input into the oil mixing tank through corresponding oil input channels, and the different oils are input according to different input ratios and flow rates, for example, A, B and C oils are respectively input into the oil mixing tank through the first oil input channel, the second oil input channel, and the third oil input channel according to a ratio of 3:2:1 to be mixed.
Particularly, the embodiment of the invention mainly aims at mixing oil with high requirements on various indexes of mixed liquid, such as aviation lubricating oil, and the like, and tests prove that the method can well meet the performance requirements of different oil-liquid mixtures.
S102, monitoring viscosity values of oil-liquid mixtures at different levels in the oil-liquid mixing tank in real time, and determining the uniformity of the oil-liquid mixtures based on the viscosity values of the oil-liquid mixtures at different levels;
in specific implementation, after the viscosity values of the oil-liquid mixtures at different levels in the oil-liquid mixing tank are monitored in real time and before the uniformity of the oil-liquid mixtures is determined based on the viscosity values of the oil-liquid mixtures at different levels, the embodiment of the invention further comprises:
judging whether the ratio of the difference value of the viscosity values of the oil-liquid mixture of any two levels to the average value of the viscosity values of all the levels is smaller than a preset first proportional threshold, and if so, further judging the viscosity value V of the oil-liquid mixture at the output end of the oil-liquid mixing tankoutAnd if the difference value of the viscosity threshold value corresponding to the temperature of the current oil-liquid mixture is smaller than a preset second proportion threshold value, triggering the viscosity value of the oil-liquid mixture based on different levels to determine the uniformity of the oil-liquid mixture.
In the embodiment of the invention, the first proportion threshold, the second proportion threshold and the uniformity threshold are obtained by repeatedly realizing the operation for multiple times.
For example, in a specific implementation, the first proportion threshold is set to be 1%, the second proportion threshold is set to be 3%, and the uniformity threshold needs to be set according to a specific oil-liquid mixture.
After the two proportional thresholds are simultaneously met, the embodiment of the invention further monitors the mixing uniformity based on the viscosity value of the oil-liquid mixture monitored in real time, so that the mixing uniformity of the oil-liquid mixture can be accurately determined, and various performance indexes of the oil-liquid mixture are finally improved.
S103, according to the degree of consistency of the fluid mixture of different levels and the temperature of current fluid mixture, right the degree of consistency of fluid mixture carries out the analysis, and after the degree of consistency of fluid mixture reaches the predetermined fluid mixture degree of consistency threshold value that the temperature of current fluid mixture corresponds, then confirm the fluid mixture misce bene.
That is to say, the embodiment of the invention monitors the viscosity values of the oil-liquid mixtures in different levels in the oil-liquid mixing tank in real time, determines the uniformity of the oil-liquid mixtures based on the monitored viscosity values of the oil-liquid mixtures, and finally judges whether the oil-liquid mixtures are uniformly mixed according to the uniformity of the oil-liquid mixtures and the preset threshold value of the uniformity of the oil-liquid mixtures corresponding to the temperature of the current oil-liquid mixtures.
In a specific implementation, the real-time monitoring of the viscosity values of the oil-liquid mixtures at different levels in the oil-liquid mixing tank in the embodiment of the present invention includes: the viscosity sensor arranged on the oil mixing tank is used for monitoring the viscosity values of oil and liquid mixtures in different levels in the oil mixing tank in real time.
Specifically, the viscosity sensors in the embodiment of the invention are uniformly distributed in the kettle body of the oil-liquid mixing tank along the vertical direction, and the viscosity sensors are uniformly distributed on the vertical projection parallel to the axis of the kettle body.
In other words, in the embodiment of the present invention, viscosity sensors are arranged on different levels according to requirements of a user on uniformity of the oil-liquid mixture, and the more viscosity sensors are arranged, the more the viscosity sensors are arranged, the more accurate the uniformity of the oil-liquid mixture is calculated subsequently, and the corresponding calculation amount is increased. For example, the tank body of the oil-liquid mixing tank is divided into 3 stages, namely a first stage, a second stage and a third stage, from top to bottom in the vertical direction, and one viscosity sensor is arranged at intervals of 120 degrees in the circumferential direction of each stage, so that 3 × 3 ═ 9 viscosity sensors are arranged on the whole tank body. Of course, the position of the viscosity sensor may be arbitrarily set by those skilled in the art according to actual needs, as long as the performance index required by the uniformity of the final oil-liquid mixture can be achieved, and the present invention is not limited to this.
Specifically, in the embodiment of the present invention, three viscosity sensors, namely, a first viscosity sensor, a second viscosity sensor and a third viscosity sensor, are provided, and as shown in fig. 4, the projections of the three viscosity sensors in the embodiment of the present invention are distributed at 120 ° with respect to each other, the first viscosity sensor is located at the top of the tank body of the oil-liquid mixing tank, the second viscosity sensor is located at the middle of the tank body of the oil-liquid mixing tank, and the third viscosity sensor is located at the bottom of the tank body of the oil-liquid mixing tank, that is, in the embodiment of the present invention, the three viscosity sensors are sequentially provided from top to bottom along the vertical direction of the tank body of the oil-liquid mixing tank.
Real-time supervision the viscosity number of the fluid mixture of different levels in the fluid blending tank includes:
monitoring viscosity values of oil liquid mixtures at different levels in the oil liquid mixing tank according to a preset period, and setting the viscosity value of the oil liquid mixture in the ith monitoring period to be Vi＝{Vui,Vmi,Vdi}, wherein: vuiIs the viscosity value, V, monitored by the first viscosity sensor in the ith monitoring periodmiIs the viscosity value, V, monitored by the second viscosity sensor in the ith monitoring perioddiIs the viscosity value monitored by the second viscosity sensor in the ith monitoring period;
the viscosity number of fluid mixture based on different levels is confirmed the degree of consistency of fluid mixture includes:
calculating the arithmetic mean value of the real-time viscosity value of the oil-liquid mixture
Respectively calculating the uniformity of the oil-liquid mixture at the top, the middle and the bottom in the kettle body based on the arithmetic mean value
Wherein j is u, m, d, CijFor the ith monitoring period, the homogeneity, V, of the mixed oil at the jth positionijThe viscosity value of the oil-liquid mixture is monitored in real time at the jth position in the ith monitoring period;
determining the real-time uniformity of the oil liquid mixture: ci＝maxCij＝max(Ciu Cim Cid) Wherein, CiuIs the real-time uniformity of the top in the kettle body, CimIs the real-time uniformity of the middle part in the kettle body, CidThe real-time uniformity of the bottom in the kettle body is obtained.
The method for analyzing the uniformity of the oil-liquid mixture according to the uniformity of the oil-liquid mixture at different levels and the temperature of the current oil-liquid mixture comprises the following steps:
based on the temperature of the current oil-liquid mixture and the corresponding relation between the preset temperature of the oil-liquid mixture and the threshold value of the uniformity of the oil-liquid mixture, the threshold value C of the uniformity of the oil-liquid mixture is determinedΔWhen C is presenti≤CΔAnd judging that the uniformity of the oil-liquid mixture meets the requirement, otherwise, continuing stirring until the uniformity meets the requirement.
It should be noted that, in the embodiment of the present invention, the preset threshold C of the temperature of the oil-liquid mixture and the uniformity of the oil-liquid mixture is setΔThe corresponding relation is stored in an oil mixture uniformity threshold table, and an oil mixture uniformity threshold C corresponding to the oil mixture temperatureΔIs a dynamic range of variation, which is determined experimentally. That is to say, the threshold value of the uniformity of the oil-liquid mixture corresponding to the temperature of each oil-liquid mixture in the embodiment of the invention is [ C ]Δ- Δ to CΔ+Δ]And the delta is the range of the change of the threshold value of the uniformity of the oil-liquid mixture.
The method of the present invention will be explained and illustrated in detail below with reference to the example of blending 8# crude oil and 20# crude oil to obtain a model of aviation oil:
s1, after 8# crude oil and 20# crude oil are injected into an oil mixing tank (hereinafter referred to as an oil tank) according to a preset proportion, determining the monitoring temperature of the oil-liquid mixture in the oil mixing tank at present, monitoring the viscosity values of the mixed oil at the upper layer, the middle layer and the lower layer of the mixed oil at the monitoring temperature in real time, and respectively naming the values as Vu、Vm、Vd(ii) a Taking the data record of the mixed oil viscosity value returned in the ith monitoring period at the monitoring temperature as a set Vi＝{Vui,Vmi,Vdi}；
Wherein: vuiThe viscosity value of the viscosity sensor at the upper layer returned in the ith monitoring period at the monitoring temperature; vmiThe viscosity value of the viscosity sensor at the middle layer returned in the ith monitoring period at the monitoring temperature is obtained; vdiThe viscosity value of the viscosity sensor at the lower layer returned in the ith monitoring period at the monitoring temperature;
specifically, in the embodiment of the invention, after the viscosity test of two base oils is completed, the two lubricating oils are prepared according to the mixing proportion; then, mixing the two lubricating oils by adopting a laboratory test method; no obvious heat absorption or heat release phenomenon exists in the mixing process, the stirring is carried out by using a glass rod, and the mixing time of 500mL is about 30 s. Table 1 was obtained by testing (reference values, differences in different oils and proportions, the following are examples only):
TABLE 1 comparison of temperature and viscosity values
According to the viscosity test value obtained by testing as the target control value of the mixing uniformity, namely the first proportional threshold, and in consideration of the difference of viscosity tests in a laboratory and an actual oil mixing tank, the target viscosity value is set within +/-3% of the target control value, so that the test accuracy is better ensured.
Further judge the viscosity value V of the oil-liquid mixtureoutAnd the difference value of the viscosity threshold value at the current temperature, and whether the ratio of the difference value to the viscosity threshold value is less than 3% of the preset value, if so, triggering the next step to be executed.
S2, calculating the uniformity C of the real-time viscosity value at the monitoring temperaturei：
1) Calculating the arithmetic mean value of the real-time viscosity value at the monitoring temperature
Wherein:
the arithmetic mean value of the viscosity values of the upper layer viscosity sensor, the middle layer viscosity sensor and the lower layer viscosity sensor returned in the ith monitoring period at the monitoring temperature; vuiThe viscosity value of the viscosity sensor at the upper layer returned in the ith monitoring period at the monitoring temperature; vmiThe viscosity value of the viscosity sensor at the middle layer returned in the ith monitoring period at the monitoring temperature is obtained; vdiThe viscosity value of the viscosity sensor at the lower layer returned in the ith monitoring period at the monitoring temperature;
2) respectively calculating the uniformity C of the upper layer, the middle layer and the lower layer of the mixed oil at the monitoring temperatureij
3) calculating the uniformity C of the real-time mixed oil at the monitoring temperaturei
Ci＝maxCij＝max(Ciu，Cim，Cid)
S3, mixed oil uniformity analysis:
setting a threshold C of the homogeneity of the mixed oilΔWhen C is presenti≤CΔAnd judging whether the uniformity of the mixed oil in the oil tank meets the requirement, otherwise, continuing stirring until the uniformity meets the requirement.
Specifically, CΔ1%, and three viscosity sensor clocks at the upper layer, the middle layer and the lower layer of the mixed oil are synchronously calibrated, data are returned for 20 times in 1 minute, and one sampling period is 3 s.
It should be noted that, in the embodiment of the present invention, both the sampling period and the detection period may be arbitrarily set according to actual needs, and the present invention does not discuss this in detail.
Experiments prove that the method provided by the embodiment of the invention can obviously improve the ratio precision of two kinds of initial lubricating oil, thereby improving the quality of mixed oil. In addition, the embodiment of the invention adopts the performance parameters of the mixed oil to carry out real-time monitoring on the mixing uniformity, particularly realizes whether the mixing is uniform or not through the judgment of the viscosity parameters, and can effectively realize the judgment of the mixing uniformity. In addition, the invention can complete the mixing task of the lubricating oil by one-key operation or few operations according to the mixing proportion requirement, and can monitor whether the viscosity parameter meets the technical index requirement in real time after the mixing is completed, thereby reducing the personnel configuration. In addition, the sealed heating and stirring tank body is used, so that the mixing device has anti-pollution measures under different environmental conditions, and further, no pollutant enters lubricating oil in the processes of weighing, mixing and oil conveying of the lubricating oil. Furthermore, the heating kettle structure with the hollow interlayer is formed by sleeving the outer jacket outside the kettle body, so that the problem that lubricating oil working in a low-temperature environment cannot be stirred or is difficult to stir due to too high viscosity of the lubricating oil is solved, the heating and viscosity reduction effects of the lubricating oil are ensured by a heating mode, the stirred lubricating oil is finally mixed uniformly and effectively, and the starting requirement of an aeroengine in the low-temperature environment can be met.
A second embodiment of the present invention provides a mixing device for implementing any one of the methods according to the first embodiment of the present invention, and referring to fig. 2, the mixing device according to the embodiment of the present invention includes: the oil-liquid mixing device comprises an oil-liquid mixing tank 10, a plurality of oil-liquid input channels, oil-liquid output channels and a controller, wherein the oil-liquid mixing tank 10 is connected with the oil-liquid input channels and the oil-liquid output channels;
the oil liquid input channels are used for inputting a certain preset oil liquid into the oil liquid mixing tank 10 according to a set flow speed and a set flow rate, wherein the input oil liquid corresponding to each oil liquid input channel is distributed according to a preset distribution rule;
the oil mixing tank is used for mixing oil input by different oil input channels, monitoring viscosity values of oil mixtures in different levels in the kettle body 11 in real time, and sending the monitored viscosity values to the controller;
the controller is used for according to the viscosity number of the fluid mixture of different levels is confirmed in the fluid blending tank 10 the degree of consistency of fluid mixture to according to the degree of consistency of the fluid mixture of different levels and the temperature of current fluid mixture, it is right the degree of consistency of fluid mixture carries out the analysis, and after the degree of consistency of fluid mixture reaches the preset fluid mixture degree of consistency threshold value that the temperature of current fluid mixture corresponds, then confirms the fluid mixture misce bene.
The embodiment of the invention monitors the viscosity values of oil-liquid mixtures of different levels in an oil-liquid mixing tank 10 in real time, determines the uniformity of the oil-liquid mixtures based on the monitored viscosity values of the oil-liquid mixtures, and finally judges whether the oil-liquid mixtures are uniformly mixed or not according to the uniformity of the oil-liquid mixtures and the preset threshold value of the uniformity of the oil-liquid mixtures corresponding to the current temperature of the oil-liquid mixtures.
Specifically, a kettle body 11 is further arranged in the oil mixing tank 10 in the embodiment of the invention, the kettle body 11 is connected with the oil input channel and the oil output channel, a plurality of viscosity sensors are arranged in the kettle body 11, and a stirring paddle for stirring oil is also arranged in the kettle body 11;
the kettle body 11 is used for mixing oil liquid input by different oil liquid input channels;
the viscosity sensor is used for monitoring the viscosity value of the oil-liquid mixture in the kettle body 11 in real time and sending the monitored viscosity to the controller for the controller to analyze the uniformity of the oil-liquid mixture.
Further, the mixing device of the embodiment of the present invention further includes a heater, and the heater further includes an outer jacket 12 and a heating rod;
the outer jacket 12 is arranged outside the oil mixing tank 10 and used for preserving heat of the oil mixing tank 10;
the heating rod is arranged in the kettle body 11 and used for heating the oil-liquid mixture in the kettle body 11 according to preset conditions.
Generally, the mixing device of the embodiment of the invention comprises an oil mixing tank 10 as a main body, wherein the oil mixing tank 10 further comprises a kettle body 11, an outer jacket 12, an inner component and perforated connecting pipes for various purposes, such as oil filling pipes and the like. A sealing cover is arranged at the kettle opening of the kettle body 11, a stirring motor 16a is further arranged on the sealing cover, and the stirring shaft 16b with a stirring paddle 16c blade extends into a kettle cavity, namely a stirring cavity, so that the online stirring and mixing effect of the lubricating oil is realized.
In the embodiment of the present invention, the kettle body 11 is mainly used for providing a suitable space for mixing and stirring the basic lubricating oil liquid therein, and simultaneously needs to realize a heating function. In order to ensure uniform heating, the embodiment of the invention adopts an electric heating mixing device, namely a heating rod 14, to heat the heat conduction oil on line. Through annotating the oil pipe and injecting the conduction oil for heating medium in outer jacket 12, heat heating medium through heating rod 14, lubricating oil heats in the heat energy of production is to the cauldron to reduce lubricating oil viscidity, promote actual stirring effect and stirring efficiency.
In actual manufacturing, the kettle body 11 is in a conventional vertical cylindrical shape. In order to facilitate the discharge of the mixed product oil, the lower seal head, namely the kettle bottom, adopts an elliptical seal head form, and the upper seal head, namely the kettle opening, is covered with a seal cover in a flat cover seal head form. The flange is welded at the upper end socket and is used for connecting the invention with an auxiliary frame. According to the process requirements, various connecting pipes such as an oil filling pipe, a clean discharging pipe and the like are installed on the embodiment of the invention so as to meet the arrangement requirements of feeding, discharging, exhausting and various sensors.
So far, the heating of the invention adopts the heating form of an integral type outer jacket 12+ heat conducting oil + heating rod 14. Heat conducting oil is adopted as a heat transfer medium in the outer jacket 12. Since the heat transfer oil has a good heat transfer effect and is not easy to scale, the outer jacket 12 may be in the form of an integral U-shaped jacket as shown in fig. 3 and 5, and may not be detachable. In order to improve the heat transfer efficiency, as shown in fig. 5, a spiral heat conduction fin 13 is welded on the outer wall of the kettle 11, so as to increase the heat conduction area and improve the strength of the kettle. The inner diameter of the outer jacket 12 is the outer diameter of the kettle plus 100mm to ensure that a heating chamber of sufficient size is formed. The heating medium is communicated and flows along the gaps between the heat-conducting fins and the outer jacket, and the uniformity of heat transfer can be effectively ensured.
Furthermore, the mixed lubricating oil has low viscosity and belongs to the stirring of low-viscosity liquid; in order to eliminate the swirling phenomenon of the lubricating oil in the kettle body 11 and ensure that the mixed lubricating oil can axially flow up and down to form uniform mixing, four groups of liquid baffle plates 15 shown in fig. 3 and 5 are added into the kettle body 11. After the liquid baffle plate 15 is added, the stirring power consumption is obviously increased, and the stirring power consumption is increased along with the increase of the number of the liquid baffle plates 15, and the width of the liquid baffle plate 15 is about 1/12-1/10 of the inner diameter of the kettle body 11. When the vertical heating pipe is installed, the liquid baffle 15 can be omitted, and the selection can be made according to the field conditions. The number of the liquid baffle plates 15 and the number of the heating pipes can be increased or decreased as appropriate.
As an accessory, the perforated connecting pipe is mainly used for installing equipment such as pipelines and sensors, and the perforated oil pipeline is positioned at the bottom of the mixing tank. The openings of part of sensors such as a viscosity sensor a, a temperature sensor, a dielectric constant sensor and the like are positioned on the side wall of the tank body, the openings of the other part of sensors such as a density sensor and the like are positioned on the sealing cover, and the opening of the observation window is positioned on the sealing cover.
Referring to fig. 3, the stirring assembly includes a stirring motor 16a, a stirring shaft 16b, and a stirring paddle 16 c. The stirring assembly adopts a scheme of serially arranging a hybrid stirrer, namely, the lower end of the stirring shaft 16b adopts a straight blade type stirring structure, and the main purpose is to ensure sufficient radial speed when lubricating oil is small and realize rapid and uniform mixing. The upper end of the stirring device adopts a propeller type stirring structure, and the stirring device mainly aims to reduce radial speed and tangential speed, reduce liquid level change caused by centrifugal force and reduce air bubble entering. During the stirring process, the influence of the stirring assembly on the liquid level should be reduced as much as possible, and the top axial speed should be reduced. The middle part adopts a pitched blade paddle type stirring structure for transition. FIG. 6 is a steady-state flow field generated by the tandem mixer; as can be seen from FIG. 5, after the liquid baffle 15 and the mixing type stirrer are serially arranged, the mixing speed of the mixed oil in the kettle body is uniform, the radial speed and the axial speed are both good, and the effect is obvious.
On the basis of the structure, as shown in fig. 2, the oil mixing tank 10 of the invention is provided with two oil inlet pipelines communicated with the stirring cavity at the kettle body and one oil pipeline communicated with the stirring cavity at the kettle body; the oil inlet pipeline sequentially comprises an oil well pump 21, an oil inlet sensor 22, an exhaust valve 23, a ball valve 24 and an oil inlet flow sensor 25 along the oil advancing direction; the oil conveying pipeline sequentially comprises an oil conveying pump 31, an oil conveying flow sensor 32, an oil conveying electromagnetic valve 33, a pressure sensor 34 before filtration, a filter 35 and a pressure sensor 36 after filtration along the advancing direction of oil, and the mixed oil is detected by the pressure sensor 36 after filtration and then is output to external equipment through an oil adding assembly; the outlet end of the oil transfer pump 31 is provided with a circulation oil path, and oil at the circulation oil path flows back to the stirring cavity after passing through a circulation solenoid valve 37.
In an actual working state, taking the mixing of the No. 8 crude oil and the No. 20 crude oil as an example, the operation flow of the invention is as follows:
crude oil injection:
and the PLC calculates the injection quantity of the 8# crude oil and the 20# crude oil according to the recorded process parameters in proportion. Pressing a 'start' soft key on the touch screen starts the mixing program. The PLC-DQ switching value outputs a starting signal to control an oil pump 21 at an oil inlet pipeline where the 8# crude oil is located to start to operate, an oil inlet pressure sensor detects that an oil pipe pressure signal is fed back to an AI input interface of the PLC, after the pressure reaches 0.1MPa, the PLC-DQ outputs a signal of opening a ball valve 24, the ball valve 24 is opened, and the 8# crude oil starts to be injected into the oil mixing tank 10. The pressure of the oil pump 21 still does not reach 0.1MPa after running for 30 seconds, and the machine is stopped to give an alarm to prompt 'oil pump failure or check the oil quantity in the 8# crude oil barrel'; and when the pressure changes from high to low and is lower than 0.1MPa, the system pauses, and the 8# original oil barrel is prompted to be replaced. After finishing 8# crude oil barrel and changing, press "start" soft button on the touch-control screen and continue to carry out 8# crude oil and pour into until satisfying the technology demand, the oil mass is poured into how much and is detected by oil feed flow sensor 25. The 20# crude injection process is the same as the 8# crude injection process.
In the process of crude oil injection, a mixed oil level meter can be arranged to monitor the liquid level in the oil mixing tank 10 in real time, and once the set limit height is exceeded, the system is stopped and an alarm is given out in time no matter whether the process is met.
Stirring the mixed oil:
after the 8# and 20# crude oil is injected according to the process requirements, firstly the liquid level sensor detects the quantity of heat transfer oil, namely the heating medium, and if the quantity of the heat transfer oil is lower than a set value, the heat transfer oil is prompted to be injected in time until the heating condition is met. The PLC-DQ outputs a signal for starting the stirring motor 16a, the stirring motor 16a starts stirring, then the PLC-DQ outputs a thermal resistance heating signal at intervals of 10s in a stepping mode for starting a thermal resistance, and the thermal resistance also serves as a heating rod for heating the oil-liquid mixing tank 10 through heat conduction oil. The temperature of the heat transfer oil is detected by a Pt100 thermocouple connected to a PLC-AI interface, and the highest temperature of the heat transfer oil is not more than 60 ℃. When the temperature of the heat conduction oil reaches 60 ℃, the thermal resistor works in a pulsating mode to stabilize the temperature of the heat conduction oil until the temperature of the mixed oil is close to the temperature required by the process, and then the starting number of the heating resistors is decreased gradually.
Whether the mixed oil meets the process requirements or not, and the main index is the viscosity of the mixed oil. The viscosity of the mixed oil is measured by a viscosity sensor and a 4-20 mA signal is output and transmitted to a PLC-AI interface. The upper, middle and lower positions of the oil mixing tank 10 are respectively provided with a viscosity sensor, and the viscosity of the mixed oil at the upper layer, the middle layer and the lower layer in the oil mixing tank 10 is respectively detected to meet the process requirements, namely the target value is +/-1%; the viscosity error of the three parts is less than or equal to 3 percent. In addition, the viscosity sensor a can also have a temperature measuring function, the oil temperature can be monitored in real time through the viscosity sensor in the main lubricating oil mixing process, a 4-20 mA signal is transmitted to the PLC-AI interface, and after the mixed oil reaches the process required temperature, the thermal resistor is started circularly to keep the mixed process temperature until the mixing process is finished.
In the process of lubricating oil mixing, the circulating oil path and the oil transportation path share the same oil transportation pump 31, and the oil mixing circulation is realized by switching of the circulating electromagnetic valve 37.
Outputting mixed oil:
the PLC-DQ switching value oil transfer pump 31 starts a signal to control the oil transfer pump 31 to start running, the pressure sensor 34 detects that an oil pipe pressure signal is fed back to an AI input interface of the PLC before filtering, and when the pressure reaches 0.1MPa, the PLC-DQ outputs a signal for opening the oil transfer electromagnetic valve and opens the oil transfer electromagnetic valve 33 (interlocked with the circulating electromagnetic valve 37) to start mixed oil output.
The relevant content of the embodiments of the present invention can be understood by referring to the first embodiment of the present invention, and will not be discussed in detail herein.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, and the scope of the invention should not be limited to the embodiments described above.
Claims (10)
1. A mixing uniformity analysis method based on viscosity on-line detection is characterized by comprising the following steps:
injecting different preset oil liquids into an oil liquid mixing tank according to a preset proportion for mixing;
monitoring viscosity values of oil-liquid mixtures at different levels in the oil-liquid mixing tank in real time, and determining the uniformity of the oil-liquid mixtures based on the viscosity values of the oil-liquid mixtures at different levels;
according to the degree of consistency of the fluid mixture of different levels and the temperature of current fluid mixture, it is right the degree of consistency of fluid mixture carries out the analysis, and after the degree of consistency of fluid mixture reaches the predetermined fluid mixture degree of consistency threshold value that the temperature of current fluid mixture corresponds, then confirms fluid mixture misce bene.
2. The method of claim 1, wherein the real-time monitoring of viscosity values of different levels of the oil mixture within the oil mixture tank comprises:
the viscosity sensor arranged on the oil mixing tank is used for monitoring the viscosity values of oil and liquid mixtures in different levels in the oil mixing tank in real time.
3. The method according to claim 2, wherein the viscosity sensors are distributed in plurality, the viscosity sensors are uniformly distributed in the kettle body of the oil mixing tank along the vertical direction, and the viscosity sensors are uniformly distributed on a vertical projection parallel to the axis of the kettle body.
4. The method according to claim 2, wherein the viscosity sensors are three, namely a first viscosity sensor, a second viscosity sensor and a third viscosity sensor, the first viscosity sensor is positioned at the top of the kettle body of the oil mixing tank, the second viscosity sensor is positioned at the middle of the kettle body of the oil mixing tank, and the third viscosity sensor is positioned at the bottom of the kettle body of the oil mixing tank;
real-time supervision the viscosity number of the fluid mixture of different levels in the fluid blending tank includes:
monitoring viscosity values of oil liquid mixtures at different levels in the oil liquid mixing tank according to a preset period, and setting the viscosity value of the oil liquid mixture in the ith monitoring period to be Vi＝{Vui,Vmi,Vdi}, wherein: vuiIs the viscosity value, V, monitored by the first viscosity sensor in the ith monitoring periodmiIs the viscosity value, V, monitored by the second viscosity sensor in the ith monitoring perioddiIs the viscosity value monitored by the second viscosity sensor in the ith monitoring period;
the viscosity number of fluid mixture based on different levels is confirmed the degree of consistency of fluid mixture includes:
calculating the arithmetic mean value of the real-time viscosity value of the oil-liquid mixture
Respectively calculating the uniformity of the oil-liquid mixture at the top, the middle and the bottom in the kettle body based on the arithmetic mean value
Wherein j is u, m, d, CijFor the ith monitoring period, the homogeneity, V, of the mixed oil at the jth positionijThe viscosity value of the oil-liquid mixture is monitored in real time at the jth position in the ith monitoring period;
determining the real-time uniformity of the oil liquid mixture: ci＝maxCij＝max(CiuCimCid) Wherein, CiuIs the real-time uniformity of the top in the kettle body, CimIs the real-time uniformity of the middle part in the kettle body, CidThe real-time uniformity of the bottom in the kettle body is obtained.
5. The method of claim 4, wherein analyzing the homogeneity of the oil mixture according to the homogeneity of the oil mixture at different levels and the current temperature of the oil mixture comprises:
based on the temperature of the current oil-liquid mixture and the corresponding relation between the preset temperature of the oil-liquid mixture and the threshold value of the uniformity of the oil-liquid mixture, the threshold value C of the uniformity of the oil-liquid mixture is determinedΔWhen C is presenti≤CΔAnd judging that the uniformity of the oil-liquid mixture meets the requirement, otherwise, continuing stirring until the uniformity meets the requirement.
6. The method according to any one of claims 1 to 5, wherein after the viscosity values of the oil-liquid mixture at different levels in the oil-liquid mixing tank are monitored in real time, and before the uniformity of the oil-liquid mixture is determined based on the viscosity values of the oil-liquid mixture at different levels, the method further comprises:
judging whether the ratio of the difference value of the viscosity values of the oil-liquid mixture of any two levels to the average value of the viscosity values of all the levels is smaller than a preset first proportional threshold, and if so, further judging the viscosity value V of the oil-liquid mixture at the output end of the oil-liquid mixing tankoutAnd judging whether the ratio of the difference value to the viscosity threshold value is smaller than a preset second proportion threshold value or not according to the difference value of the viscosity threshold value corresponding to the temperature of the current oil-liquid mixture, and if so, triggering the viscosity value of the oil-liquid mixture based on different levels to determine the uniformity of the oil-liquid mixture.
7. The method of claim 6,
the first proportional threshold, the second proportional threshold, and the uniformity threshold are all experimentally measured.
8. A mixing device for carrying out the method of any one of claims 1 to 7, comprising: the oil-liquid mixing device comprises an oil-liquid mixing tank, a plurality of oil-liquid input channels, an oil-liquid output channel and a controller, wherein the oil-liquid mixing tank is respectively connected with the oil-liquid input channels and the oil-liquid output channels;
the oil liquid input channels are used for inputting a certain preset oil liquid into the oil liquid mixing tank according to a set flow speed and a set flow rate, and the plurality of oil liquid input channels input the preset oil liquid into the oil liquid mixing tank together;
the oil liquid mixing tank is used for mixing oil liquid input by different oil liquid input channels, monitoring viscosity values of oil liquid mixtures of different levels in the oil liquid mixing tank in real time and sending the monitored viscosity values to the controller;
the controller is used for according to the degree of consistency of the fluid mixture of different levels in the fluid blending tank and the temperature of current fluid mixture, it is right the degree of consistency of fluid mixture carries out the analysis, and after the degree of consistency of fluid mixture reaches the preset fluid mixture degree of consistency threshold value that the temperature of current fluid mixture corresponds, then confirm the fluid mixture misce bene.
9. Mixing device according to claim 8,
a kettle body is further arranged in the oil mixing tank, the kettle body is connected with the oil input channel and the oil output channel, a plurality of viscosity sensors are arranged in the kettle body, and stirring paddles are also arranged in the kettle body;
the kettle body is used for containing the preset oil liquid and mixing the oil liquid input by different oil liquid input channels through the stirring paddles;
the viscosity sensor is used for monitoring the viscosity value of the oil-liquid mixture in the kettle body in real time and sending the monitored viscosity value to the controller for the controller to analyze the uniformity of the oil-liquid mixture.
10. The mixing device of claim 8 or 9, further comprising a heater, the heater further comprising an outer jacket and a heating rod;
the outer jacket is arranged outside the oil mixing tank and used for preserving heat of the oil mixing tank;
the heating rod sets up the cauldron is internal, the heating rod is used for right according to the preset condition the internal fluid mixture of cauldron heats.
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| CN117191130A (en) * | 2023-09-27 | 2023-12-08 | 深圳市英博伟业科技有限公司 | Multi-scene online temperature and humidity monitoring method and system |
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