CN114018758A - Online density detection device and detection method for viscous medium - Google Patents
Online density detection device and detection method for viscous medium Download PDFInfo
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- CN114018758A CN114018758A CN202111404636.9A CN202111404636A CN114018758A CN 114018758 A CN114018758 A CN 114018758A CN 202111404636 A CN202111404636 A CN 202111404636A CN 114018758 A CN114018758 A CN 114018758A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/02—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume
- G01N9/04—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume of fluids
Abstract
The invention discloses an online density detection device and method for viscous media, and belongs to the technical field of density detection. The device comprises a detection cabinet, a control module, a sampling pipe, a sampling valve, a constant volume container, a full volume judgment container, a vacuum valve, a vacuum pump, a first electromagnetic valve, a second electromagnetic valve, a first weighing sensor and a second weighing sensor, the sampling pipe is connected with the bottom of the constant volume container, the bottom intercommunication of container is judged with full volume to the top of constant volume container through the intercommunication hose, the top of container is judged to full volume is connected with vacuum pump through the vacuum tube of taking the vacuum valve and the exit linkage of hose and second three-way pipe is passed through to its upper portion or top, two imports of second three-way pipe are connected with compressed gas supply structure and are supplied structural connection with the washing liquid through the pipeline of taking the second solenoid valve through the pipeline of taking first solenoid valve respectively, constant volume container and full volume judge that the container hangs on detecting cabinet through first weighing sensor and second weighing sensor respectively.
Description
Technical Field
The invention belongs to the technical field of density detection, and particularly relates to an online density detection device and method for viscous media, in particular to an online density detection device and method for liquid in a wet-process phosphoric acid preparation process, wherein the online density detection device comprises phosphoric ore pulp (the density is 1.6-1.7 g/cm)3) Concentrated sulfuric acid (density of 1.8-1.9 g/cm)3) Wet process phosphoric acid (density less than 1.3 g/cm)3) And a washing liquid (density less than 1.1 g/cm)3) And the like, particularly wet-process phosphoric acid and concentrated sulfuric acid.
Background
The wet production is to decompose the powdered rock phosphate with inorganic acid, separate out the crude phosphoric acid, and then purify to obtain the phosphoric acid product. The cost of the wet-process phosphoric acid is 20-30% lower than that of the phosphoric acid by a thermal method, and the purity of the product can be comparable to that of the phosphoric acid by the thermal method after the phosphoric acid is purified by a proper method. The wet process phosphoric acid process is dominated by phosphoric acid production.
The production process of the wet-process phosphoric acid comprises the following steps: ball-milling phosphorite and phosphogypsum backwater, obtaining phosphorite slurry with proper concentration by thickening the ore slurry after ball-milling, reacting the phosphorite slurry with concentrated sulfuric acid and counter acid (dilute phosphoric acid generated by filtering), filtering to obtain phosphoric acid after reaction, and concentrating and purifying (optionally) the phosphoric acid to obtain the phosphoric acid with proper concentration.
In the process, the density of the phosphorite pulp and the density of the phosphoric acid are detected, the density of the concentrated sulfuric acid is optionally detected or not detected, and the density of the washing liquid in the tail gas treatment process (defluorination) in the phosphoric acid preparation process is optionally detected or not detected. Density measurements (weight divided by volume) are typically made in the prior art by densitometers (including test cabinets, sensors, control modules, etc.) or by laboratories; for the method for detecting the densitometer, the densitometer needs to be corrected again or directly replaced after a period of time; the method for laboratory testing is time-consuming and labor-consuming.
Disclosure of Invention
In order to solve the above problems, embodiments of the present invention provide an online density detection apparatus and a detection method for viscous media, which can automatically implement density measurement of viscous liquid, do not need manual intervention, and save time and labor; meanwhile, the device has accurate measurement, and the precision can reach 0.01g/cm3(ii) a The detection time is short, and the time for detection and cleaning can be within 2 minutes; it takes a long time (e.g., two months) to perform the proofreading. The technical scheme is as follows:
on one hand, the embodiment of the invention discloses an online density detection device for viscous media, which comprises a detection cabinet, a control module in the detection cabinet, a sampling pipe 1, a sampling valve on the sampling pipe 1, a constant volume container 2 in the detection cabinet, a full volume judgment container 3, a vacuum valve 4, a vacuum pump 5, a first electromagnetic valve 8, a second electromagnetic valve 9, a first weighing sensor 10 and a second weighing sensor 11, wherein the tail end of the sampling pipe 1 is connected with the bottom of the constant volume container 2, the top of the constant volume container 2 is communicated with the bottom of the full volume judgment container 3 through a communicating hose 6, the top of the full volume judgment container 3 is connected with the vacuum pump 5 through a vacuum pipe 19 with the vacuum valve 4, the upper part or the top of the full volume judgment container is connected with an outlet of a second three-way pipe 7 through a hose, two inlets of the second three-way pipe 7 are respectively connected with a compressed gas supply structure through a pipeline with the first electromagnetic valve 8 and connected with a pipe 9 with a compressed gas supply structure through a pipe with the second electromagnetic valve 9 The way is connected with washing liquid supply structure, constant volume container 2 and full volume judge container 3 and hang on detecting the cabinet through first weighing sensor 10 and second weighing sensor 11 respectively, control module is connected with sampling valve, first solenoid valve 8, second solenoid valve 9, vacuum valve 4, vacuum pump 5, first weighing sensor 10 and second weighing sensor 11 electricity.
The detection cabinet in the embodiment of the invention comprises a cabinet body 12, a cabinet door which is arranged at the front side of the cabinet body 12 and can be unscrewed, and a fixing plate 13 which is arranged in the cabinet body 12 and is positioned at the rear side of the cabinet door, wherein the cabinet body 12 is divided into two cavities which are arranged side by side in the front and back direction by the fixing plate 13, the left side or the right side of the cabinet body is rotatably arranged on the corresponding side of the cabinet body 12, two hollowed holes 14 are arranged on the fixing plate 13 along the vertical direction, the constant volume container 2 and the full volume judging container 3 are both positioned in front of the fixing plate 13 and are respectively positioned at the two hollowed holes 14, and the first weighing sensor 10 and the second weighing sensor 11 are both fixed at the rear side of the fixing plate 13 and penetrate through the corresponding hollowed holes 14.
Specifically, the first solenoid valve 8, the second solenoid valve 9, the vacuum valve 4, and the vacuum pump 5 in the embodiment of the present invention are provided on the front side of the fixed plate 13.
Further, the control module in the embodiment of the present invention includes a control unit, a touch display screen 15 and a transmitter, the transmitter is disposed at the rear side of the fixing plate 13 and electrically connected to the first weighing sensor 10 and the second weighing sensor 11, the control unit is disposed at the rear side in the cabinet 12 and electrically connected to the sampling valve, the first electromagnetic valve 8, the second electromagnetic valve 9, the vacuum valve 4, the vacuum pump 5, the touch display screen 15 and the transmitter, and the touch display screen 15 is disposed at the front side of the fixing plate 13.
The sampling valve in the embodiment of the invention comprises a third electromagnetic valve 16 and a pneumatic clamp 17 clamped on the sampling pipe 1, the sampling pipe 1 is a hose, a first three-way pipe 18 is arranged on an air outlet of the compressed gas supply structure, two outlets of the first three-way pipe 18 are respectively connected with the pneumatic clamp 17 through a pipeline with the third electromagnetic valve 16 and connected with the second three-way pipe 7 through a pipeline with the first electromagnetic valve 8, and the third electromagnetic valve 16 is electrically connected with a control module.
Specifically, the constant volume container 2 and the full volume judging container 3 in the embodiment of the present invention are both vertically arranged cylindrical glass containers, and both the upper end and the lower end of the constant volume container 2 are arc structures, the volume of the constant volume container is greater than or equal to 50mL, and the upper end of the constant volume container is higher than the lower end of the full volume judging container 3, and the communicating hose 6 is bent downward and then upward along the liquid conveying direction to form an S shape.
The vacuum pump 5 in the embodiment of the invention is a peristaltic pump, the sampling tube 1, the communicating hose 6 and the vacuum tube 19 are all silica gel hoses, the vacuum valve 4 is arranged close to the upper end of the full-volume judging container 3, and the vacuum tube 19 is bent downwards to form an inverted U shape.
Specifically, in the embodiment of the present invention, the left side of the fixed plate 13 is rotatably disposed on the left side of the cabinet 12, the touch display screen 15 is disposed on the upper portion of the left side of the fixed plate 13, the third electromagnetic valve 16 is disposed on the left side of the cabinet 12 and in front of the fixed plate 13, the constant volume container 2 is disposed below the touch display screen 15, the first electromagnetic valve 8 and the second electromagnetic valve 9 are both disposed on the left side of the constant volume container 2 and are both disposed below the touch display screen 15, the second three-way pipe 7 and the first three-way pipe 18 are both disposed in front of the fixed plate 13, the full volume determining container 3 is disposed on the right side of the constant volume container 2 and has a third three-way pipe at the top thereof, the upper end of the constant volume container 2 reaches the middle portion of the full volume determining container 3, the middle portion of the communication hose 6 is fixed on the fixed plate 13 and communicates the constant volume container 2 and the full volume determining container 3 in an S shape, the vacuum valve 4 and the vacuum pump 5 are both positioned on the right side of the full volume judging container 3, the vacuum pump 5 is positioned below the vacuum valve 4, and the vacuum valve 4 is positioned above the full volume judging container 3; one outlet of the third three-way pipe is connected with the vacuum pipe 19, and the other outlet of the third three-way pipe is connected with the cleaning pipe; the cleaning pipe bypasses the rear side of the fixing plate 13 and is connected with the inlet of the second three-way pipe 7.
On the other hand, the embodiment of the invention also provides an online density detection method for viscous liquid, which comprises the following steps:
(1) performing initial calibration on the online density detection device by adopting clear water and/or liquid to be detected;
(2) closing the first electromagnetic valve 8, the second electromagnetic valve 9 and the third electromagnetic valve 16, opening the vacuum valve 4 and the vacuum pump 5, sucking the liquid to be detected into the constant volume container 2, after the constant volume container 2 is filled, continuously feeding the liquid to be detected into the full volume judgment container 3, closing the vacuum valve 4 and the vacuum pump 5 and opening the third electromagnetic valve 16 when the weight detected by the second weighing sensor 11 reaches a set value;
(3) after the preset time, the control module calculates the density of the liquid to be detected according to the detection data of the first weighing sensor 10;
(4) after the detection is finished, opening the first electromagnetic valve 8 or the second electromagnetic valve 9 to introduce compressed air or cleaning liquid to send out the liquid to be detected in the constant volume container 2 and the full volume judgment container 3;
(5) opening and closing the first electromagnetic valve 8, the second electromagnetic valve 9 or/and the third electromagnetic valve 16 according to a preset cleaning strategy to clean the online density detection device;
wherein the cleaning liquid is selected from normal temperature water, hot water, normal temperature water with a cleaning agent, hot water with a cleaning agent or high temperature steam, and the pressure of the compressed air is more than 0.2 MPa.
Wherein, the step (5) specifically comprises two schemes:
in the first scheme, after detection is finished, the second electromagnetic valve 9 is opened to introduce cleaning liquid, and after a period of time, the first electromagnetic valve 8 is opened and the second electromagnetic valve 9 is closed to introduce compressed air; repeating the above process at least twice, except for introducing the cleaning liquid for the first time, opening the third electromagnetic valve 16 every time the cleaning liquid is introduced later, and closing the third electromagnetic valve 16 after a period of time; the time for introducing the cleaning liquid is gradually reduced, and the time for introducing the compressed air is gradually increased;
according to the second scheme, after detection is finished, the second electromagnetic valve 9 is opened to introduce cleaning liquid, and after a period of time, the second electromagnetic valve 9 is closed; opening the second electromagnetic valve 9 and the third electromagnetic valve 16 again, closing the second electromagnetic valve 9 and the third electromagnetic valve 16 after a period of time, and repeating the process at least twice; finally, the first solenoid valve 8 is opened and the second solenoid valve 9 is closed to let in compressed air.
The technical scheme provided by the embodiment of the invention has the following beneficial effects: the embodiment of the invention provides an online density detection device and a detection method for viscous media, which can automatically realize density measurement of viscous liquid without manual participation and save time and labor; meanwhile, the device has accurate measurement, and the precision can reach 0.01g/cm3(ii) a The detection time is short, and the time for detection and cleaning can be within 2 minutes; it takes a long time (e.g., two months) to perform the proofreading. The device is also convenient for on-line detection and easy for automatic cleaning. In addition, this patent still has the advantage that adaptability is wide, can compile control module to adjustment testing process and cleaning process, still can adjust sampling frequency.
Drawings
FIG. 1 is a schematic block diagram of an in-line density sensing device for viscous media in an embodiment of the present invention;
FIG. 2 is a circuit diagram of a control module in an embodiment of the invention;
FIG. 3 is a schematic diagram of a part of an online density detecting apparatus for viscous medium according to an embodiment of the present invention.
In the figure: 1 sampling pipe, 2 constant volume containers, 3 full volume judgment containers, 4 vacuum valves, 5 vacuum pumps, 6 communicating hoses, 7 second three-way pipes, 8 first electromagnetic valves, 9 second electromagnetic valves, 10 first weighing sensors, 11 second weighing sensors, 12 cabinets, 13 fixing plates, 14 hollowed holes, 15 touch display screens, 16 third electromagnetic valves, 17 pneumatic clamps, 18 first three-way pipes and 19 vacuum pipes.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
Example 1
Referring to fig. 1 to 3, embodiment 1 discloses an on-line density measuring apparatus for viscous medium, the device is including detecting the cabinet (can locate the scene, also can locate the monitor), sampling pipe 1 (its top is connected with reservoir or pipeline that waits to detect liquid, can set up the three-way pipe (can gate on it, liquid after the detection returns and waits to detect the liquid system, abluent lotion output to waste water barrel), if not setting up, then all return and wait to detect the liquid system, sampling valve on the sampling pipe 1 and the control module who detects in the cabinet, constant volume container 2 (volume is fixed), full volume judges container 3 (is used for judging constant volume container 2 and whether fills up), vacuum valve 4, vacuum pump 5 (is used for making and waits to detect liquid flow), first solenoid valve 8, second solenoid valve 9, first weighing sensor 10 and second weighing sensor 11 etc.. The tail end of the sampling tube 1 is connected with the bottom of the constant volume container 2, and the top of the constant volume container 2 is communicated with the bottom of the full volume judging container 3 through a communicating hose 6; only after the constant volume container 2 is filled, the liquid to be detected can enter the full volume judgment container 3. The top of the full volume judging container 3 is connected with a vacuum pump 5 through a vacuum tube 19 with a vacuum valve 4, the upper part or the top of the full volume judging container is connected with an outlet of a second three-way pipe 7 through a hose so as to be introduced with clear liquid and compressed air, two inlets of the second three-way pipe 7 are respectively connected with a compressed gas supply structure (used for providing compressed air, specifically an air compressor or an air storage tank) through a pipeline with a first electromagnetic valve 8 and connected with a cleaning liquid supply structure (used for providing cleaning liquid, preferably with certain pressure, specifically a storage tank or a tap water pipe) through a pipeline with a second electromagnetic valve 9. Constant volume container 2 and full volume judge that container 3 hangs through first weighing sensor 10 and second weighing sensor 11 respectively and detect the counter-top in order to realize weight detection, and control module is connected in order to realize the automatic control of this device with sampling valve, first solenoid valve 8, second solenoid valve 9, vacuum valve 4, vacuum pump 5, first weighing sensor 10 and 11 electricity of second weighing sensor.
Referring to fig. 3, the detection cabinet in the embodiment of the present invention includes a cabinet body 12 (specifically, the cabinet body may be rectangular), a cabinet door on the front side of the cabinet body 12 and capable of being unscrewed, and a fixing plate 13 (specifically, a rectangular plate that is engaged with the cabinet body 12) located in the cabinet body 12 and behind the cabinet door. The fixed plate 13 separates the cabinet body 12 for two cavity (being preceding cavity and back cavity respectively) and its left side or right side rotation (specifically can be through the hinge) side by side around locating the cabinet body 12 and correspond on the side, be equipped with two fretwork holes 14 (specifically can be the rectangular hole of vertical setting) along vertical direction on the fixed plate 13, constant volume container 2 judges container 3 with full volume and all is located the place ahead of fixed plate 13 and its two fretwork holes 14 departments respectively, first weighing sensor 10 and second weighing sensor 11 are all fixed at the rear side of fixed plate 13 (specifically fix the left side or the right side that correspond fretwork hole 14) and it passes corresponding fretwork hole 14 and constant volume container 2 and full volume and judges container 3 fixed connection.
Specifically, referring to fig. 3, the first solenoid valve 8, the second solenoid valve 9, the vacuum valve 4, and the vacuum pump 5 in the embodiment of the present invention are provided on the front side of the fixed plate 13.
Further, referring to fig. 2 and 3, the control module in the embodiment of the present invention includes a control unit (specifically including a PLC and its accessory circuit), a touch display screen 15, a transmitter (configured with the first weighing sensor 10 and the second weighing sensor 11 for performing data processing on weighing data), and the like, where the transmitter is disposed at the rear side of the fixing plate 13 and electrically connected to the first weighing sensor 10 and the second weighing sensor 11, the control unit is disposed at the rear side in the cabinet 12 and electrically connected to the sampling valve, the first electromagnetic valve 8, the second electromagnetic valve 9, the vacuum valve 4, the vacuum pump 5, the touch display screen 15, and the transmitter, and the touch display screen 15 is disposed at the front side of the fixing plate 13. Specifically, the control unit comprises a Siemens SMART control module, the touch display screen 15 is a touch display screen produced by MCGS, the transmitter is a DY510 transmitter, and the first weighing sensor 10 and the second weighing sensor 11 are loadcells 8610 (the upper limit is 300g, and the precision is 0.01 g).
Referring to fig. 1 to 3, the sampling valve in the embodiment of the present invention includes a third electromagnetic valve 16 and a pneumatic clamp 17 clamped on the sampling tube 1 (when the sampling tube 1 is opened, the sampling tube 1 is clamped to prevent liquid from flowing), the sampling tube 1 is a flexible tube, a first three-way tube 18 is disposed on an air outlet of the compressed gas supply structure, two outlets of the first three-way tube 18 are respectively connected to the pneumatic clamp 17 through a pipeline with the third electromagnetic valve 16 and connected to one inlet of the second three-way tube 7 through a pipeline with the first electromagnetic valve 8, and the third electromagnetic valve 16 is electrically connected to the control module. In this patent, adopt pneumatic clamp 17 to control sampling pipe 1, can guarantee to examine time measuring, liquid does not flow in order to guarantee the degree of accuracy that detects.
Specifically, referring to fig. 3, the constant volume container 2 and the full volume judging container 3 in the embodiment of the present invention are both vertically arranged cylindrical glass containers, and both the upper end and the lower end of the constant volume container 2 (specifically, 250 mL) are arc-shaped structures, the volume of the constant volume container 2 is greater than or equal to 50mL, and the upper end of the constant volume container is higher than the lower end of the full volume judging container 3, and the communicating hose 6 is bent downward and then upward along the liquid conveying direction to form an S-shape. The volume-constant container 2 and the full volume judging container 3 can be made of other materials, corrosion resistance is required, the wall hanging of liquid to be detected is avoided, convenience in cleaning is also required, and a common glass container is usually adopted.
The vacuum pump 5 in the embodiment of the invention is a peristaltic pump, the sampling tube 1, the communicating hose 6 and the vacuum tube 19 are all silica gel hoses (which can be made of other materials and are required to be corrosion-resistant and have long service life), the vacuum valve 4 is arranged close to the upper end of the full-volume judging container 3, and the vacuum tube 19 is bent downwards to form an inverted U shape.
Specifically, referring to fig. 3, the left side of the fixed plate 13 in the embodiment of the present invention is rotatably disposed on the left side of the cabinet 12, the touch display screen 15 is disposed on the upper portion of the left side of the fixed plate 13, the third electromagnetic valve 16 is disposed on the left side in the cabinet 12 and in front of the fixed plate 13, and the pneumatic clamp 17 is disposed on the lower side in the cabinet 12. Constant volume container 2 is located the below of touch display screen 15, and first solenoid valve 8 and second solenoid valve 9 (first solenoid valve 8 and second solenoid valve 9 can control and set up side by side) all are located constant volume container 2's left side and it all is located the below of touch display screen 15, and second three-way pipe 7 and first three-way pipe 18 all are located the place ahead of fixed plate 13. The full volume judging container 3 is positioned at the right side of the constant volume container 2, a third three-way pipe is arranged at the top of the full volume judging container 3, and the upper end of the constant volume container 2 reaches the middle part of the full volume judging container 3. The middle part of the communication hose 6 is fixed on the fixing plate 13 and it communicates the constant volume container 2 and the full volume judging container 3 in an S-shape. The vacuum valve 4 and the vacuum pump 5 are both located on the right side of the full volume judging container 3, the vacuum pump 5 is located below the vacuum valve 4, and the vacuum valve 4 is located above the full volume judging container 3. One outlet of the third tee is connected to a vacuum tube 19, the other outlet (on the rear side) of which is connected to a purge tube. The back side of the cleaning pipe bypassing the fixed plate 13 (provided with a through hole for the cleaning pipe to pass through) is connected with the inlet of the second three-way pipe 7.
Example 2
(1) and (3) carrying out initial calibration on the online density detection device by adopting clear water and/or liquid to be detected. Specifically, the calibration can be carried out three times by using clear water and/or liquid to be detected, and then an average value is obtained; when the water is adopted for calibration, the density of the water is 1.00g/cm3(ii) a When the liquid to be detected is used for calibration, the density of the liquid to be detected is measured by a laboratory (measuring the volume by a volumetric flask and measuring the mass by an analytical balance).
(2) And closing the first electromagnetic valve 8, the second electromagnetic valve 9 and the third electromagnetic valve 16, opening the vacuum valve 4 and the vacuum pump 5, sucking the liquid to be detected into the constant volume container 2, after the constant volume container 2 is filled, continuously allowing the liquid to be detected to enter the full volume judgment container 3, closing the vacuum valve 4 and the vacuum pump 5 and opening the third electromagnetic valve 16 when the weight detected by the second weighing sensor 11 reaches a set value. In this step, the liquid level of the full volume judging container 3 is up to the middle thereof (which may be set as required) and the liquid level therein is preferably higher than the top of the constant volume container 2.
(3) After a preset time (for example, after the third electromagnetic valve 16 is closed for 30 seconds), the control module calculates the density of the liquid to be detected according to the detection data of the first weighing sensor 10 (the density is corrected according to the result of the step (1) by dividing the weight by the volume of the constant volume container 2). In this step, a plurality of weight data acquired by the first load cell 10 within 5 seconds may be selected and averaged.
(4) After the detection is finished, the first electromagnetic valve 8 or the second electromagnetic valve 9 is opened to introduce compressed air or cleaning liquid to send out the liquid to be detected in the constant volume container 2 and the full volume judging container 3 (to a liquid system to be detected or a waste water barrel), and the step is also equivalent to one-time cleaning.
(5) And opening and closing the first electromagnetic valve 8, the second electromagnetic valve 9 or/and the third electromagnetic valve 16 according to a preset cleaning strategy to clean the online density detection device.
Wherein the cleaning liquid is selected from normal temperature water, hot water, normal temperature water with cleaning agent, hot water with cleaning agent or high temperature steam (selected according to the liquid to be detected), the pressure of compressed air is more than 0.2MPa, and the pressure of the cleaning liquid is preferably more than 0.5 MPa. After the online density detection device for the viscous medium is used for a period of time, the device can be calibrated by adopting the method in the step (1), and the device is generally calibrated after about 2 months.
Wherein, the step (5) specifically comprises two schemes:
in the first scheme, after detection is finished, the second electromagnetic valve 9 is opened to introduce cleaning liquid, and after a period of time, the first electromagnetic valve 8 is opened and the second electromagnetic valve 9 is closed to introduce compressed air; repeating the above process at least twice, except for introducing the cleaning liquid for the first time, opening the third electromagnetic valve 16 every time the cleaning liquid is introduced later, and closing the third electromagnetic valve 16 after a period of time; the time for introducing the cleaning liquid is gradually reduced, and the time for introducing the compressed air is gradually increased. Specifically, the total time for each introduction of the cleaning liquid and the compressed air is less than 30 s.
According to the second scheme, after detection is finished, the second electromagnetic valve 9 is opened to introduce cleaning liquid, and after a period of time, the second electromagnetic valve 9 is closed; opening the second electromagnetic valve 9 and the third electromagnetic valve 16 again, closing the second electromagnetic valve 9 and the third electromagnetic valve 16 after a period of time, and repeating the process at least twice; finally, the first solenoid valve 8 is opened and the second solenoid valve 9 is closed to let in compressed air.
The effect of the on-line density detection device disclosed in this patent is verified as follows:
table 1 shows the density of the pulp (every ten minutes, the result of the laboratory method is 1.642-1.646 g/cm)3) Table 2 shows the density of concentrated sulfuric acidDetecting the concentration (every five minutes, and the detection result by adopting a laboratory method is 1.831-1.834 g/cm)3) Table 3 shows the density of the finished phosphoric acid product (every five minutes, the laboratory method is adopted to detect the density of the finished phosphoric acid product, and the detection result is 1.112-1.116g/cm3) Table 4 shows the results of the density measurements (every five minutes, using a laboratory method, of 1.271-1.275 g/cm) of the intermediate phosphoric acid (phosphoric acid without impurity removal and blending)3）。
TABLE 1
TABLE 2
TABLE 3
TABLE 4
As can be seen from tables 1-4, the measurement results of the apparatus for phosphoric ore slurry, sulfuric acid and phosphoric acid are very stable and comparable to the results of laboratory tests.
Table 5 shows the density measurements of the pulp at intervals (5 or 6 days) using the apparatus, test method and densitometer (ZY-02), respectively, with the new densitometer being used at 5 days 4 months 2021, and the apparatus is just set up.
TABLE 5
As can be seen from Table 5, this patent applicationThe detection result within 60 days is very accurate and is not greatly different from the detection result of an experimental method (generally all are 0.003 g/cm)3Within); after the proofreading, the difference with the detection result of the experimental method is not great.
In conclusion, the device has the advantages of accurate detection result and long-time accurate measurement.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The online density detection device for the viscous medium comprises a detection cabinet and a control module inside the detection cabinet; the device is characterized by further comprising a sampling pipe (1), a sampling valve on the sampling pipe (1) and a constant volume container (2), a full volume judging container (3), a vacuum valve (4), a vacuum pump (5), a first electromagnetic valve (8), a second electromagnetic valve (9), a first weighing sensor (10) and a second weighing sensor (11) in a detection cabinet, wherein the tail end of the sampling pipe (1) is connected with the bottom of the constant volume container (2), the top of the constant volume container (2) is communicated with the bottom of the full volume judging container (3) through a communicating hose (6), the top of the full volume judging container (3) is connected with the vacuum pump (5) through a vacuum pipe (19) with the vacuum valve (4), the upper part or the top of the full volume judging container is connected with an outlet of a second three-way pipe (7) through a hose, two inlets of the second three-way pipe (7) are respectively connected with a compressed gas supply structure through a pipeline with the first electromagnetic valve (8) and connected with a compressed gas supply structure through a pipeline with the second electromagnetic valve (7) (9) The pipeline and the washing liquid supply structure of be connected, constant volume container (2) and full volume judge container (3) and hang on detecting the cabinet through first weighing sensor (10) and second weighing sensor (11) respectively, control module is connected with sampling valve, first solenoid valve (8), second solenoid valve (9), vacuum valve (4), vacuum pump (5), first weighing sensor (10) and second weighing sensor (11) electricity.
2. The on-line density detection device for sticky media according to claim 1, wherein the detection cabinet comprises a cabinet body (12), a cabinet body (12) and a fixing plate (13) which is arranged in the cabinet body (12) and can be unscrewed at the front side, the fixing plate (13) is used for dividing the cabinet body (12) into two cavities which are arranged side by side in the front and back direction and is arranged on the corresponding side of the cabinet body (12) in a rotating manner at the left side or the right side of the cabinet body, two hollowed holes (14) are arranged on the fixing plate (13) in the vertical direction, the constant volume container (2) and the full volume judgment container (3) are both arranged in the front of the fixing plate (13) and are respectively arranged at the two hollowed holes (14), and the first weighing sensor (10) and the second weighing sensor (11) are both fixed at the rear side of the fixing plate (13) and penetrate through the corresponding hollowed holes (14).
3. The on-line density detecting device for viscous medium of claim 2, wherein the first solenoid valve (8), the second solenoid valve (9), the vacuum valve (4) and the vacuum pump (5) are disposed at the front side of the fixing plate (13).
4. The on-line density detection device for sticky media according to claim 3, wherein the control module comprises a control unit, a touch display screen (15) and a transmitter, the transmitter is arranged at the rear side of the fixing plate (13) and is electrically connected with the first weighing sensor (10) and the second weighing sensor (11), the control unit is arranged at the rear side in the cabinet body (12) and is electrically connected with the sampling valve, the first electromagnetic valve (8), the second electromagnetic valve (9), the vacuum valve (4), the vacuum pump (5), the touch display screen (15) and the transmitter, and the touch display screen (15) is arranged at the front side of the fixing plate (13).
5. The on-line density detection device for the viscous medium as claimed in claim 4, wherein the sampling valve comprises a third electromagnetic valve (16) and a pneumatic clamp (17) clamped on the sampling pipe (1), the sampling pipe (1) is a hose, a first three-way pipe (18) is arranged on an air outlet of the compressed gas supply structure, two outlets of the first three-way pipe (18) are respectively connected with the pneumatic clamp (17) through a pipeline with the third electromagnetic valve (16) and connected with the second three-way pipe (7) through a pipeline with the first electromagnetic valve (8), and the third electromagnetic valve (16) is electrically connected with the control module.
6. The on-line density detection device for the viscous medium according to claim 5, wherein the constant volume container (2) and the full volume judgment container (3) are both vertically arranged cylindrical glass containers, the upper end and the lower end of the constant volume container (2) are both arc-shaped structures, the volume of the constant volume container is greater than or equal to 50mL, the upper end of the constant volume container is higher than the lower end of the full volume judgment container (3), and the communication hose (6) is bent downwards and then upwards along the liquid conveying direction to form an S shape.
7. The on-line density detection device for the viscous medium according to claim 6, wherein the vacuum pump (5) is a peristaltic pump, the sampling tube (1), the communication hose (6) and the vacuum tube (19) are silica gel hoses, the vacuum valve (4) is arranged near the upper end of the full-volume judgment container (3), and the vacuum tube (19) is bent downwards to form an inverted U shape.
8. The on-line density detection device for viscous media according to claim 7, wherein the left side of the fixing plate (13) is rotatably disposed on the left side of the cabinet body (12), the touch display screen (15) is disposed on the upper portion of the left side of the fixing plate (13), the third electromagnetic valve (16) is disposed on the left side of the cabinet body (12) and located in front of the fixing plate (13), the constant volume container (2) is located below the touch display screen (15), the first electromagnetic valve (8) and the second electromagnetic valve (9) are both located on the left side of the constant volume container (2) and both located below the touch display screen (15), the second three-way pipe (7) and the first three-way pipe (18) are both located in front of the fixing plate (13), the full volume judging container (3) is located on the right side of the constant volume container (2) and the top thereof is provided with a third three-way pipe, the upper end of the constant volume container (2) is connected with the middle of the full volume judging container (3), the middle of the communicating hose (6) is fixed on the fixing plate (13) and is communicated with the constant volume container (2) and the full volume judging container (3) in an S shape, the vacuum valve (4) and the vacuum pump (5) are both positioned on the right side of the full volume judging container (3), the vacuum pump (5) is positioned below the vacuum valve (4), and the vacuum valve (4) is positioned above the full volume judging container (3); one outlet of the third three-way pipe is connected with a vacuum pipe (19), and the other outlet of the third three-way pipe is connected with a cleaning pipe; the cleaning pipe bypasses the rear side of the fixing plate (13) and is connected with an inlet of the second three-way pipe (7).
9. An on-line density detection method for viscous liquid, characterized in that the method comprises:
(1) performing initial calibration on the online density detection device by adopting clear water and/or liquid to be detected;
(2) closing the first electromagnetic valve (8), the second electromagnetic valve (9) and the third electromagnetic valve (16), opening the vacuum valve (4) and the vacuum pump (5), sucking the liquid to be detected into the constant volume container (2), after the constant volume container (2) is filled, continuously allowing the liquid to be detected to enter the full volume judgment container (3), and when the weight detected by the second weighing sensor (11) reaches a set value, closing the vacuum valve (4) and the vacuum pump (5), and opening the third electromagnetic valve (16);
(3) after the preset time, the control module calculates the density of the liquid to be detected according to the detection data of the first weighing sensor (10);
(4) after the detection is finished, opening the first electromagnetic valve (8) or the second electromagnetic valve (9) to introduce compressed air or cleaning liquid to send out the liquid to be detected in the constant volume container (2) and the full volume judgment container (3);
(5) opening and closing the first electromagnetic valve (8), the second electromagnetic valve (9) or/and the third electromagnetic valve (16) according to a preset cleaning strategy to clean the online density detection device;
wherein the cleaning liquid is selected from normal temperature water, hot water, normal temperature water with a cleaning agent, hot water with a cleaning agent or high temperature steam, and the pressure of the compressed air is more than 0.2 MPa.
10. The on-line density detection method for viscous liquid according to claim 9, wherein the step (5) specifically comprises two schemes:
according to the first scheme, after detection is finished, the second electromagnetic valve (9) is opened to introduce cleaning liquid, and after a period of time, the first electromagnetic valve (8) is opened and the second electromagnetic valve (9) is closed to introduce compressed air; repeating the process at least twice, except for introducing the cleaning liquid for the first time, opening the third electromagnetic valve (16) every time the cleaning liquid is introduced later, and closing the third electromagnetic valve (16) after a period of time; the time for introducing the cleaning liquid is gradually reduced, and the time for introducing the compressed air is gradually increased;
according to the second scheme, after detection is finished, the second electromagnetic valve (9) is opened to introduce cleaning liquid, and after a period of time, the second electromagnetic valve (9) is closed; opening the second electromagnetic valve (9) and the third electromagnetic valve (16), closing the second electromagnetic valve (9) and the third electromagnetic valve (16) after a period of time, and repeating the process at least twice; finally, the first solenoid valve (8) is opened and the second solenoid valve (9) is closed to introduce compressed air.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111404636.9A CN114018758A (en) | 2021-11-24 | 2021-11-24 | Online density detection device and detection method for viscous medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116699167A (en) * | 2023-08-08 | 2023-09-05 | 江中药业股份有限公司 | Sample injector for tight-fold combined instrument and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116699167A (en) * | 2023-08-08 | 2023-09-05 | 江中药业股份有限公司 | Sample injector for tight-fold combined instrument and control method thereof |
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