Feed liquid characteristic value measuring system

Abstract

The utility model discloses a feed liquid characteristic value measuring system, which belongs to the technical field of industrial control and comprises a control module, a measuring module controlled by the control module and arranged on a process pipeline, and a cleaning module with one end connected with the process pipeline and the other end connected with the measuring module, the measuring module comprises a flow cell, and a sensor and a buffer chamber which are arranged on the flow cell. According to the utility model, the sensor can be cleaned conveniently and quickly, the online measurement precision of the sensor is improved, the effectiveness of the sensor can be judged in time, and the characteristic value of feed liquid can be measured smoothly.

Description

Technical Field

[0001] The utility model belongs to the technical field of industrial control, and in particular relates to a material liquid characteristic value measurement system. Background Art

[0002] In the field of industrial production, accurate measurement of process fluid parameters is the key to ensuring product quality, improving production efficiency and meeting environmental emission standards. The conventional method of measuring process fluid parameters is to use sampling and analysis for offline measurement. However, although offline measurement can provide higher measurement accuracy, it still has the limitations of randomness, lack of representativeness and delayed measurement results, which has become a bottleneck restricting the optimization and improvement of the production process.

[0003] At present, the commonly used sensor detection technology is to detect the characteristic value of the liquid by installing a sensor on the shunt pipe. This method will inevitably produce offline liquid that needs to be processed later during the measurement process. At the same time, the sensor will be affected by the ambient temperature and the shunt pipe, which will lead to inaccurate measurement. In addition, the sensor is easily contaminated during long-term use, which will further lead to inaccurate measurement results of the sensor. Therefore, it is very important to detect the failure of the sensor in time and clean and maintain it. However, the method of disassembling the sensor for manual maintenance not only increases the maintenance workload, but also comes with high cost expenditure. Therefore, a liquid characteristic value measurement system is needed that can clean the sensor conveniently and quickly, can judge the effectiveness of the sensor in time, and realize online accurate measurement. Utility Model Content

[0004] The purpose of the utility model is to provide a material liquid characteristic value measurement system, which can conveniently and quickly clean the sensor and can timely judge the effectiveness of the sensor, improve the online measurement accuracy of the sensor and ensure the smooth measurement of the material liquid characteristic value.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A material liquid characteristic value measurement system comprises a control module, a measurement module arranged on a process pipeline and controlled by the control module, and a cleaning module connected to the process pipeline at one end and the measurement module at the other end; the measurement module comprises a circulation pool and a sensor and a buffer chamber arranged on the circulation pool.

[0007] A further improvement of the technical solution of the utility model is that the circulation pool has a six-way structure, which is connected to the process pipeline through both ends in the y-axis direction, the sensor is arranged at one end or both ends of the circulation pool in the x-axis direction, the buffer chamber is arranged at the upper end of the circulation pool in the z-axis direction, and the lower end of the circulation pool in the z-axis direction is connected to the cleaning module.

[0008] A further improvement of the technical solution of the utility model is that the cleaning module includes a pretreatment unit connected to the process pipeline through pipeline one, a jet unit connected to the pretreatment unit through pipeline two, and a probe rod connected to the jet unit at one end and the lower end of the circulation pool in the z-axis direction at the other end.

[0009] A further improvement of the technical solution of the utility model is that when the sensor is arranged at one end of the circulation pool in the x-axis direction, the sensor is a refractometer sensor, the probe rod is a single-nozzle probe rod, and the nozzle of the probe rod extends into the sensor from the lower end of the circulation pool in the z-axis direction.

[0010] A further improvement of the technical solution of the utility model is that when the sensors are respectively arranged at both ends of the circulation pool in the x-axis direction, the sensor is a spectrophotometric sensor, the probe rod is a double-nozzle probe rod, and the two nozzles of the probe rod extend into the interior of the two sensors from the lower end of the circulation pool in the z-axis direction.

[0011] A further improvement of the technical solution of the utility model is that the control module includes a microcontroller and an input / output unit for monitoring and controlling the cleaning module and the measuring module, which communicates with the microcontroller through an internal bus.

[0012] A further improvement of the technical solution of the utility model is that the buffer cavity is composed of a metal shell and an anti-corrosion elastic organic material.

[0013] Due to the adoption of the above technical solution, the technical progress achieved by the utility model is:

[0014] The measurement system of the utility model can directly and continuously monitor the characteristic values ​​of the slurry online at the production site, breaking through the limitations of offline measurement, and effectively avoiding the offline slurry that needs to be processed later during the shunt measurement process. At the same time, it can conveniently and quickly clean the sensor, improve the measurement accuracy of the sensor, and can timely judge the effectiveness of the sensor to ensure the smooth measurement of the characteristic values ​​of the slurry.

[0015] The utility model adopts a cleaning module and a measuring module that cooperate with each other. Under the control of the control module, the jet unit of the cleaning module can suck the liquid in the process pipeline into its cavity through pipeline 1, generate a pulse jet to clean the sensor in the measuring module, thereby improving the measurement accuracy of the sensor without disassembling the sensor.

[0016] The utility model adopts a pre-treatment unit arranged in the cleaning module, which can filter out impurities in the liquid before the jet unit extracts the liquid, thereby avoiding damage to the sensor during cleaning.

[0017] The utility model adopts a buffer cavity arranged on the flow pool of the measuring module to absorb and compensate for the liquid impact energy caused by the pulse jet of the cleaning module, thereby reducing the influence of the cleaning operation on the measuring module and the process pipeline.

[0018] The control module adopted by the utility model includes a microcontroller and an input / output unit, wherein the microcontroller can realize the control, calculation, data processing, timing, interruption and other functions required by the system; the input / output unit is used to monitor and control the cleaning module and the measuring module, and communicate with the microcontroller through an internal bus; the microcontroller and the input / output unit cooperate to determine the cleaning result of the sensor according to the initial value of the sensor, the measured value after cleaning and the number of cleanings after the cleaning is completed, so as to timely judge the effectiveness of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the execution flow of the material liquid characteristic value measurement system of the utility model;

[0020] Figure 2 It is a schematic diagram of the framework of the material liquid characteristic value measurement system of the utility model;

[0021] Figure 3 It is a schematic diagram of the overall structure of the material liquid characteristic value measurement system of the utility model;

[0022] Figure 4 It is a structural schematic diagram of the measurement module in Example 1 of the feed liquid characteristic value measurement system of the utility model;

[0023] Figure 5 It is a structural schematic diagram of the measurement module in Example 2 of the feed liquid characteristic value measurement system of the utility model;

[0024] Figure 6 This is a trend diagram of the feed liquid characteristic value measurement of Example 1 of the feed liquid characteristic value measurement system of the utility model when the cleaning function is not used for 10 hours;

[0025] Figure 7 This is a trend diagram of the liquid characteristic value measurement of Example 1 of the liquid characteristic value measurement system of the utility model, in which the cleaning function is used once for 10 hours;

[0026] Figure 8 This is a trend diagram of the liquid characteristic value measurement of Example 2 of the liquid characteristic value measurement system of the utility model, using the cleaning function once for 8 hours;

[0027] Fig. 9 This is a trend diagram of the liquid characteristic value measurement of Example 2 of the liquid characteristic value measurement system of the utility model using the cleaning function twice for 8 hours;

[0028] Among them, 1. Cleaning module, 1-1. Pretreatment unit, 1-2. Jet unit, 1-3. Probe rod, 1-4. Pipeline 1, 1-5. Pipeline 2, 2. Measurement module, 2-1. Circulation pool, 2-2. Sensor, 2-3. Buffer chamber, 3. Control module, 4. Process pipeline. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the embodiments:

[0030] Example 1

[0031] like Figure 2-Figure 4 As shown, this embodiment provides a slurry characteristic value measurement system, including a control module 3, a measuring module 2 and a cleaning module 1. The measuring module 2 is arranged on the process pipeline 4, one end of the cleaning module 1 is connected to the process pipeline 4, and the other end is connected to the measuring module 2. The measuring module 2 and the cleaning module 1 are both controlled by the control module 3. The cleaning module 1 can suck the slurry in the process pipeline 4 into the interior to generate a pulse jet under the control of the control module 3, thereby cleaning the measuring module 2.

[0032] Specifically, the measuring module 2 includes a six-way flow cell 2-1 and a sensor 2-2 and a buffer chamber 2-3 arranged on the flow cell 2-1. The flow cell 2-1 is arranged on the process pipeline 4, and as a carrier of other parts in the measuring module 2, it is connected to the process pipeline 4 through both ends in the y-axis direction, the sensor 2-2 is arranged at one end of the flow cell 2-1 in the x-axis direction, the buffer chamber 2-3 is arranged at the upper end of the flow cell 2-1 in the z-axis direction, and the lower end of the flow cell 2-1 in the z-axis direction is connected to the cleaning module 1.

[0033] The buffer chamber 2-3 is composed of a metal shell and an anti-corrosion elastic organic material, which is used to absorb and compensate for the liquid impact energy caused by the pulse jet of the cleaning module 1, and reduce the impact of the cleaning operation on the measurement module 2 and the process pipeline. The sensor 2-2 uses a refractometer sensor. The refractometer sensor mainly measures the characteristic values ​​of the liquid based on the correlation between the refractive index of the material and its physical and chemical properties. The refractometer sensor usually includes a light source, one or more optical elements (such as prisms, gratings, etc.) and a detector (such as photodiodes, photodetectors, etc.). The light is emitted from the light source, passes through the optical elements, enters the liquid, and is then detected by the detector. By measuring the angles of the incident light and the refracted light, the refractive index of the liquid can be calculated, so that other characteristic values, such as concentration, temperature, etc., can be inferred based on known physical and chemical relationships.

[0034] The cleaning module 1 includes a pretreatment unit 1-1, a jet unit 1-2 and a probe rod 1-3. The pretreatment unit 1-1 is connected to the process pipeline 4 through a pipeline 1-4. Under the control of the control module 3, it can filter out impurities in the slurry before the jet unit 1-2 extracts the slurry to avoid damage to the sensor 2-2 during cleaning. During implementation, it is necessary to determine the configuration of the pretreatment unit 1-1 based on the specific characteristics of the slurry, including but not limited to selecting a suitable filter material, pore size and replacement cycle based on the characteristics of the slurry and the filtering requirements to ensure that there are no particulate matter in the jet that causes wear to the sensor 2-2.

[0035] The jet unit 1-2 is connected to the pretreatment unit 1-1 through the pipeline 1-5. Under the control of the control module 3, the jet unit 1-2 can suck the liquid in the process pipeline 4 into its cavity through the pipeline 1-5 and the pipeline 1-4, and quickly squeeze and discharge the sucked liquid to generate a pulse jet, so as to clean the sensor 2-2 in the measurement module 2, thereby improving the measurement accuracy of the sensor 2-2 without disassembling the sensor 2-2. The jet pressure and frequency generated by the jet unit 1-2 are controlled by the control module 3. The pipeline 1-4, the pipeline 2-1-5 and the process pipeline 4 are all provided with control valves.

[0036] One end of the probe rod 1-3 is connected to the jet unit 1-2, and the other end is connected to the lower end of the circulation pool 2-1 in the z-axis direction. The probe rod 1-3 is used to release the pulse jet generated by the cleaning module 1. The form of its nozzle is determined according to the type of sensor 2-2 set in the measuring module 2. Since the sensor 2-2 of this embodiment adopts a refractometer sensor, the probe rod 1-3 is a single-nozzle probe rod, and its nozzle extends from the lower end of the circulation pool 2-1 in the z-axis direction into the interior of the sensor 2-2.

[0037] The control module 3 includes a microcontroller and an input / output unit. The input / output unit communicates with the microcontroller through an internal bus to monitor and control the cleaning module 1 and the measuring module 2. The microcontroller can generate repeated control instructions through the input / output unit to enable the jet unit 1-2 to obtain intermittent jets.

[0038] like Figure 1 As shown, the operating steps of the liquid characteristic value measurement system are as follows:

[0039] Step S1: System initialization: Before starting the measurement, the entire measurement system is initialized to ensure the normal operation of the system and the accuracy of the measurement results;

[0040] Step S101: Setting parameters: According to actual needs, setting various parameters of the measurement system, including but not limited to the measurement range, accuracy, sampling frequency, etc. of the sensor 2-2;

[0041] Step S102: Checking equipment: Checking whether each device in the measurement system is working properly, including but not limited to whether the sensor 2-2 is connected correctly, whether the power supply is stable, etc.;

[0042] It should be noted that the steps of system initialization are related to the slurry and the type of sensor 2-2 used in the system of this embodiment, rather than being universal fixed steps. Therefore, the specific content of system initialization needs to be determined according to the specific slurry characteristics and the type of sensor 2-2 to ensure the accuracy of the measurement results.

[0043] Step S2: Cleaning: The microcontroller generates a repeated control instruction through the input / output unit, and the liquid in the process pipeline 4 is first filtered by the pretreatment unit 1-1, then sucked into the cavity by the jet unit 1-2 and quickly squeezed out to produce an intermittent jet, and finally the probe rod 1-3 releases a pulse jet to clean the inside of the sensor 2-2 to remove impurities and factors that affect the measurement results;

[0044] Step S3: Cleaning evaluation: The control module 3 determines the cleaning result according to the initial value of the sensor 2-2, the measured value after cleaning and the number of cleaning times. When the recovery value is less than the recovery domain, the cleaning is qualified and the next step of measuring the characteristic value can be performed. When the recovery value is greater than or equal to the recovery threshold, the cleaning is judged to be unqualified and step S2 needs to be repeated for cleaning until the cleaning is evaluated as qualified. The number of repetitions is preferably 3 times. If it exceeds the limit, it is judged that the sensor is abnormal and manual intervention is required. The calculation formula of the recovery value is as follows:

[0045]

[0046] Step S4: Measure characteristic values:

[0047] Step S401: the sensor of the measuring module 2 performs continuous measurement, and the control module 3 amplifies, filters, and converts the collected electrical signals into digital signals, and stores the digital signal data in the microcontroller;

[0048] Step S402: the control module 3 intercepts and segments the measured data, takes the average value of each small cycle measurement as the representative concentration value of a single measurement, and stores each representative concentration value in the microcontroller;

[0049] Step S403: the control module 3 calculates the standard deviation of the representative concentration value to understand the degree of fluctuation of the slurry concentration, and uses a regression analysis method to establish a relationship model between the slurry concentration and time, so as to predict the future slurry concentration, and stores the standard deviation and the relationship model in the microcontroller;

[0050] Step S5: After the measurement is completed, step S2 is repeated again to clean the sensor 2-2.

[0051] The characteristic value of the feed liquid was measured using this embodiment for 10 hours. Figure 6 and Figure 7 As shown, using the cleaning function once compared with not using the cleaning function indicates that the sensor should be cleaned regularly, and the cleaning interval is preferably 5 hours to meet the cleaning requirements.

[0052] The measurement system of this embodiment is used to perform online measurement of a stevia extract. After online cleaning, the average refractive index when stable is 31.4%. The known refractive index measured offline is 29.7%. This embodiment meets the accuracy requirement of ±3% for online measurement.

[0053] Example 2

[0054] like Figure 5 As shown, the present embodiment provides a liquid characteristic value measurement system, and its module structures, connection relationships between modules, and system operation steps are the same as those in Embodiment 1, except that:

[0055] The sensors 2-2 are respectively arranged at the two ends of the flow cell 2-1 in the x-axis direction. The sensors 2-2 are spectrophotometric sensors. The spectrophotometric sensors are sensors that analyze the concentration of a substance by using the absorption or transmission characteristics of a substance to light. The basic principle is that there is a certain proportional relationship between the absorption capacity of the solution of the substance to be measured for light of a specific wavelength and the concentration of the solution. During measurement, the light emitted by the light source passes through the material to be measured, and then the sensor detects the light intensity after passing through the material. By comparing the sample light intensity with the reference light intensity (the light intensity without filtering the material), the characteristic values ​​of the material, such as concentration and purity, can be calculated. The probe rod 1-3 is a double-sprinkler probe rod. The two nozzles of the probe rod 1-3 extend into the interior of the two sensors 2-2 respectively. The sensor 2-2 adopts a spectrophotometric sensor. Since the nozzle form of the probe rod 1-3 is determined according to the type of the sensor 2-2 set in the measurement module 2, the probe rod 1-3 in this embodiment is a double-sprinkler probe rod, and its two nozzles extend from the lower end of the flow cell 2-1 in the z-axis direction into the interior of the two sensors 2-2 respectively.

[0056] The characteristic value of the feed liquid was measured using this embodiment for 8 hours. Figure 8 and Fig. 9 As shown, using the cleaning function once compared with using the cleaning function twice indicates that the sensor should be cleaned regularly, and the cleaning interval is preferably 4 hours to meet the cleaning requirements.

[0057] The measurement system of this embodiment is used to perform online measurement of a decolorized stevia solution. After online cleaning, the average light transmittance when stable is 71.6%. The known light transmittance measured offline is 70.1%. This embodiment meets the accuracy requirement of ±3% for online measurement.

[0058] Comparative Example

[0059] This comparative example discloses a liquid material measurement system, the module structure, the connection relationship between the modules and the system operation steps are the same as those of Example 1, except that there is no cleaning module and online measurement is performed directly.

[0060] The measurement system of the comparative example and the measurement system of Example 1 were used to perform continuous measurement of the characteristic values ​​of the stevia extract and record the measurement results: the results showed that the average value of every 10 refractive indices measured in the comparative example was gradually increasing, and the standard deviation was gradually increasing, and the degree of contamination of the sensor 2-2 was gradually increasing; while the measurement system of Example 1 used the pulse jet generated by the cleaning module 1 to clean the sensor 2-2 before measurement, and the refractive index value was an average refractive index value of 31.3% of 10 consecutive measurements, the cleaning effect was good, and the measurement result was accurate.

[0061] The measurement system of the comparative example and the measurement system of Example 2 were used to perform continuous measurement of the characteristic values ​​of a certain decolorized liquid of stevia and record the measurement results: the results showed that the average value of every 10 transmittances measured in the comparative example was gradually decreasing, and the standard deviation was gradually increasing, and the contamination degree of the sensor 2-2 was gradually increasing; while the measurement system of Example 2 used the pulse jet generated by the cleaning module 1 to clean the sensor 2-2 before measurement, and the transmittance value was the average transmittance value of 71.8% for 10 consecutive measurements, the cleaning effect was good, and the measurement result was accurate.

[0062] To sum up, the measurement system of the utility model can directly and continuously monitor the characteristic values ​​of the slurry online at the production site, breaking through the limitations of offline measurement, and effectively avoiding the offline slurry that needs post-processing during the shunt measurement process. At the same time, it can conveniently and quickly clean the sensor, improve the measurement accuracy of the sensor, and can timely judge the effectiveness of the sensor to ensure the smooth measurement of the characteristic values ​​of the slurry, with high practicality and good technical effects.

[0063] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A system for measuring characteristic values ​​of a feed liquid, characterized in that: It comprises a control module (3), a measuring module (2) arranged on a process pipeline (4) and controlled by the control module (3), and a cleaning module (1) having one end connected to the process pipeline (4) and the other end connected to the measuring module (2); the measuring module (2) comprises a circulation pool (2-1) and a sensor (2-2) and a buffer chamber (2-3) arranged on the circulation pool (2-1).

2. A liquid characteristic value measurement system according to claim 1, characterized in that: The circulation pool (2-1) is a six-way structure, which is connected to the process pipeline (4) via two ends located in the y-axis direction; the sensor (2-2) is arranged at one end or both ends of the circulation pool (2-1) in the x-axis direction; the buffer chamber (2-3) is arranged at the upper end of the circulation pool (2-1) in the z-axis direction; and the lower end of the circulation pool (2-1) in the z-axis direction is connected to the cleaning module (1).

3. A liquid characteristic value measurement system according to claim 2, characterized in that: The cleaning module (1) comprises a pretreatment unit (1-1) connected to a process pipeline (4) via a first pipeline (1-4), a jet unit (1-2) connected to the pretreatment unit (1-1) via a second pipeline (1-5), and a probe rod (1-3) having one end connected to the jet unit (1-2) and the other end connected to the lower end of a circulation pool (2-1) in the z-axis direction.

4. A liquid characteristic value measurement system according to claim 3, characterized in that: When the sensor (2-2) is arranged at one end of the circulation pool (2-1) in the x-axis direction, the sensor (2-2) is a refractometer sensor, the probe rod (1-3) is a single-nozzle probe rod, and the nozzle of the probe rod (1-3) extends from the lower end of the circulation pool (2-1) in the z-axis direction into the interior of the sensor (2-2).

5. A liquid characteristic value measurement system according to claim 3, characterized in that: When the sensors (2-2) are respectively arranged at the two ends of the circulation pool (2-1) in the x-axis direction, the sensors (2-2) are spectrophotometric sensors, the probe rod (1-3) is a double-nozzle probe rod, and the two nozzles of the probe rod (1-3) extend from the lower end of the circulation pool (2-1) in the z-axis direction into the interior of the two sensors (2-2).

6. A liquid characteristic value measurement system according to any one of claims 1 to 5, characterized in that: The control module (3) comprises a microcontroller and an input / output unit that communicates with the microcontroller via an internal bus and is used to monitor and control the cleaning module (1) and the measuring module (2).

7. A liquid characteristic value measurement system according to claim 1, characterized in that: The buffer chamber (2-3) is composed of a metal shell and an anti-corrosion elastic organic material.

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