CN112858616B - Circulating water limit concentration multiple static test device and method - Google Patents
Circulating water limit concentration multiple static test device and method Download PDFInfo
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Abstract
The invention relates to a circulating water limit concentration multiple static test device and a method, the technical scheme is that the device comprises a test container, the test container comprises an outer cylinder and an inner cylinder arranged in the outer cylinder, one side of the bottom of a test cavity is connected with a liquid level meter, the bottom of the liquid level meter is provided with a pressure sensor, the test cavity is internally provided with a temperature sensor, a magnetic stirrer is arranged in the bottom of the test cavity, a thermocouple is arranged in a water bath heating cavity, the other side of the bottom of the test cavity is connected with a liquid discharge pipeline communicated with the magnetic stirrer, an outlet of the liquid discharge pipeline is connected with a sampling bottle arranged in a constant temperature device, and a fan is arranged right above the test cavity; the concentration multiple range of the invention can be flexibly set, when the delta A starts to have an ascending trend, the concentration multiple interval of the sampled sample is reduced, the ascending trend of the delta A can be well mastered, and the finally obtained limit concentration multiple is more accurate.
Description
Technical Field
The invention relates to the field of circulating water concentration multiple measurement, in particular to a circulating water limit concentration multiple static test device and method.
Background
The circulating water limit concentration multiple static test is used as a scale inhibitor screening test before the circulating water dynamic simulation test, so that a proper scale inhibitor and dosage can be primarily screened out for the dynamic test, the concentration multiple maintained by the dynamic test is determined, the circulating water limit concentration multiple static test is equivalent to a pre-test of the dynamic simulation test, and the frequency of the dynamic test can be greatly reduced. In addition, the circulating water dynamic simulation test device consumes about 2t of test water for one-time scale inhibitor and dosage performance test, has huge water consumption and higher cost, and therefore, the static test also has the effect of greatly reducing the test cost.
The current static test method comprises placing a glass jar containing 5L of water sample and a certain amount of scale inhibitor in a constant temperature water bath at 45+ -1deg.C, evaporating and concentrating while supplementing water sample, keeping water level in the glass jar unchanged, sampling from the glass jar periodically during test, and measuring alkalinity and Ca 2+ And Cl - The concentration was continued until the limit concentration multiple was reached. Limiting concentration multiple of test water (K) Lim ) Cl for the test water under the test conditions - The difference in concentration ratio (DeltaA) between the concentration ratio and the alkalinity is 0.2 or Cl - Concentration multiple and Ca 2+ When the concentration multiple difference (. DELTA.B) reached 0.2, the test water was evaporated to concentrate by the multiple. The disadvantages of this assay method are: (1) Each sampling is performed manually from a glass cylinder, so that time and labor are wasted; (2) The container adopts a glass jar, so as to be convenient for observing the liquid level condition, but the actual circulating water scaling is on the surface of the heat exchanger of the production device, the material of the container is metal, and the surface conditions of the two materials are greatly different; (3) The temperature of the sampled water sample exceeds 40 ℃, the temperature is obviously higher than the room temperature, and further evaporation and concentration are difficult to avoid; (4) Natural evaporation, the evaporation efficiency is extremely low, for example, if the scale inhibition performance of 5 medicaments and 4 doses is detected, static tests are required to be carried out for 20 times, the average period of each static test is 10d, and the time cost and the labor cost are both relatively high; (5) The water in the glass cylinder is in a non-flowing state, so that the interaction of scale forming substances is reduced. Therefore, improvements and innovations are necessary.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the circulating water limit concentration multiple static test device and the circulating water limit concentration multiple static test method, which can effectively improve the test efficiency, lighten the labor burden and improve the test accuracy.
In order to achieve the above object, the technical scheme of the present invention is as follows:
the utility model provides a circulating water limit concentration multiple static test device, including test container, test container includes urceolus and sets up the inside inner tube of urceolus, the intermediate layer between urceolus and the inner tube constitutes the water bath heating chamber, the inner tube inner chamber constitutes the test chamber, water bath heating chamber and test chamber are each other non-conductive, test chamber bottom one side is connected with the outside liquid level meter of leading out test container, the pressure sensor that is used for measuring this liquid level pressure is equipped with to the liquid level meter bottom, be equipped with in the test chamber and be used for detecting its internal liquid temperature's temperature sensor, the test chamber bottom is provided with the magnetic stirring piece, be provided with the thermocouple that is used for heating the liquid in the water bath heating chamber, test chamber bottom opposite side is connected with the drain line that is linked together with it, be provided with the solenoid valve on the drain line, the export and the sampling bottle that is located in the constant temperature equipment link to each other, be provided with along vertical direction lift, be close to or keep away from the fan of test chamber liquid level above the test chamber.
Preferably, the static test device further comprises a PLC controller, a display and an operation key, wherein the output end of the PLC controller is respectively connected with the input end of the display, the input end of the electromagnetic valve, the input end of the fan, the input end of the magnetic stirrer corresponding to the magnetic stirrer and the input end of the thermocouple, and the input end of the PLC controller is respectively connected with the output end of the pressure sensor, the output end of the operation key and the output end of the temperature sensor;
wherein:
temperature sensor: the temperature sensor is used for collecting the temperature of the test liquid in the test cavity and transmitting the temperature signal to the PLC;
thermocouple: the water bath heating device is used for receiving an on-off signal sent by the PLC, heating liquid in the water bath heating cavity through the on-off signal and heating test liquid in the test cavity in a water bath;
magnetic stirrer: the magnetic stirrer is used for receiving an on-off signal sent by the PLC and driving the magnetic stirrer in the test cavity to rotate and stir by the on-off signal so as to enable test water to be in a flowing state;
electromagnetic valve: the liquid discharge pipeline is used for receiving an opening and closing signal sent by the PLC and opening or closing the liquid discharge pipeline through the opening and closing signal;
and (3) a fan: the PLC is used for controlling the test chamber to be close to or far from the upper opening of the test chamber, the fan is turned on in the test, water vapor evaporated in the test chamber is rapidly pumped away, and meanwhile, the air flow at the upper part of the test water is increased, so that the evaporation speed is further improved;
a pressure sensor: the pressure sensor is used for measuring the pressure of the liquid level and transmitting a measured pressure signal to the PLC;
operating keys: the device is used for inputting instructions to the PLC controller and carrying out corresponding operation on each component;
and (3) a PLC controller: the temperature sensor is used for receiving a temperature signal acquired by the temperature sensor, sending an on-off signal to the thermocouple, sending a starting signal to the magnetic stirrer and sending a descending and starting signal to the fan according to the temperature signal; receiving a pressure signal sent by a pressure sensor, and sending an opening signal to an electromagnetic valve according to the pressure signal;
a display: and the device is used for displaying the result after the acquisition and output signal processing of the PLC.
Preferably, the upper end face of urceolus and inner tube flushes, and the inner tube lower surface is located the urceolus bottom surface upper surface directly over, is fixed with the end plate that covers the water bath heating chamber upper shed between urceolus and the inner tube up end, opens on the end plate has the demineralized water liquid feeding hole that link up from top to bottom, and the inner tube upper shed is connected with along the inwards protruding board that extends of circumferencial direction, and protruding board center is opened has the fan accommodation hole that is used for holding the fan, opens inlet port and the temperature sensor patchhole that link up from top to bottom on the protruding board respectively.
Preferably, the outer cylinder and the inner cylinder are cylindrical containers made of stainless steel, the stainless steel is the same as the surface of the heat exchanger of the production device, the conditions of the dynamic simulation test of the circulating water are closer, and the measurement accuracy is improved.
The circulating water limit concentration multiple static test method based on the test device comprises the following steps of:
step one, adding desalted water into a water bath heating cavity of a test container;
step two, placing the magnetic stirrer at the bottom of a test cavity of the test container;
pouring test water into the test cavity from the upper opening of the test container, observing the liquid level through a liquid level meter, stopping adding the test water when the liquid level reaches A, and corresponding to the test water volume V in the container A At this time, the pressure sensor measures a pressure P A The liquid level at the pressure sensor is B, then:
P A ＝ρ water and its preparation method g(A-B)+P 0 ，
V A ＝πr 2 A
Wherein P is 0 The pressure is standard atmospheric pressure, r is the radius of the inner wall of the inner cylinder, and g is gravity acceleration;
step four, adjusting the height of the fan to enable the fan to be positioned at the upper opening of the test cavity and attached to the top of the test cavity;
step five, inserting a temperature sensor into the test water;
step six, starting a thermocouple, heating desalted water in a water bath heating cavity of the test container, transferring heat through an inner cylinder made of stainless steel, heating test water to 45 ℃ in the water bath, and maintaining the temperature constant;
step seven, an electromagnetic stirrer is started to drive a magnetic stirrer, and test water in the test cavity is stirred to enable the test water to be in a flowing state;
step eight, starting a fan to quickly pump out water vapor evaporated in the container, and simultaneously increasing air flow at the upper part of test water to further improve the evaporation speed;
step nine, as evaporation proceeds, the test water level in the test chamber decreases, the pressure reading measured by the pressure sensor also decreases, according to the formula p=ρ Water and its preparation method g(x-B)+P 0 ，V＝πr 2 x, wherein x is the current test water level height;
when the pressure sensor measures the pressure as P B At the time, the volume V of the test water in the corresponding test cavity B At this time, the test water was concentratedShrinkage factor K B ＝V A /V B ；
Similarly, when the pressure sensor measures the pressure P C At the time of test water concentration factor K C ＝V A /V C ；
Setting the concentration multiple K of the test water to be between K B And K is equal to C When the water sample flows through the liquid discharge pipeline, the electromagnetic valve is opened, and the water sample flows into the sampling bottle;
step ten, the sampling bottle is placed in water of the constant temperature device, and after the water sample enters the sampling bottle, the water sample is rapidly cooled, so that the measurement accuracy is improved;
step eleven, replacing the sampling bottle, resetting the concentration multiple range, and repeating the steps 9-10 to obtain a plurality of samples;
step twelve, measuring Cl of the sample - Concentration multiple difference between concentration multiple and alkalinity ΔA or Cl - Concentration multiple and Ca 2+ And (3) concentrating the multiple difference delta B, wherein when delta A or delta B reaches 0.2, the multiple reached by evaporating and concentrating the test water is the limit concentration multiple under the test condition.
According to the invention, the pressure sensor is arranged at the bottom of the liquid level meter, and the pressure is represented by the formula P=ρ Water and its preparation method gh(ρ Water and its preparation method For the test of the water density, the unit is kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the g is gravity acceleration, and the unit is m/s 2 The method comprises the steps of carrying out a first treatment on the surface of the h is the distance from the pressure sensor to the water surface of the test water, the unit is m), the corresponding liquid level meter reading is converted, the test water volume in the test cavity is calculated, the concentration multiple of the current test water is obtained by comparing the test water volume with the initial test water volume, when the concentration multiple reaches the corresponding range, the electromagnetic valve is opened, a water sample flows through the liquid outlet and enters the sampling bottle, and therefore a sample is obtained, and finally the limit concentration multiple is obtained; the test container is made of stainless steel, is the same as the surface material of the heat exchanger of the production device, is closer to the conditions of the dynamic simulation test of the circulating water, is provided with a liquid level meter outside the test container by a communicating vessel principle, and solves the problem of liquid level observation; the test container comprises an interlayer and is used for containing desalted water, and the inner cylinder is heated in a water bath, so that the heated uniformity of test water in the test cavity is ensured; the sampling bottle is placed in the water of the constant temperature device, and after the water sample enters the sampling bottle, the water sample is quickly takenCooling, the accuracy of measurement is improved; the upper part of the top of the test cavity of the test container is provided with a fan, the fan is attached to the top of the inner cylinder through a lifter before the test, the fan is turned on in the test to quickly pump out water vapor evaporated in the container, and meanwhile, the air flow of the upper part of the test water is increased, so that the evaporation speed is further improved; the electromagnetic stirrer is arranged at the lower part of the test cavity, the magnetic stirrer is arranged at the bottom of the inner wall of the test cavity, and the electromagnetic stirrer drives the stirrer to stir test water in the test cavity during test, so that the test water is in a flowing state. Compared with the prior art, the invention greatly shortens the test period, the test period is not more than 3d, the time cost of test personnel is greatly reduced, and the improvement effect on the working efficiency is remarkable; meanwhile, the concentration multiple range of the invention can be flexibly set, when the delta A starts to have an ascending trend, the concentration multiple interval of the sampling sample is reduced, the ascending trend of the delta A can be well mastered, the ultimate concentration multiple obtained finally is more accurate, the use is convenient, the effect is good, and the invention is an innovation on a circulating water ultimate concentration multiple static test device and a test method.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention.
Fig. 2 is a schematic top view of the present invention.
FIG. 3 is a schematic top view of the fan of the present invention after being combined with a test vessel.
Fig. 4 is a block diagram of a circuit connection according to the present invention.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to examples.
The invention provides a circulating water limit concentration multiple static test device, which comprises a test container, wherein the test container comprises an outer cylinder 3 and an inner cylinder 4 arranged in the outer cylinder 3, an interlayer between the outer cylinder 3 and the inner cylinder forms a water bath heating cavity 4a, the inner cavity of the inner cylinder 4 forms a test cavity 3a, the water bath heating cavity 4a and the test cavity 3a are not communicated with each other, one side of the bottom of the test cavity 3a is connected with a liquid level meter 2 led out of the test container, the bottom of the liquid level meter 2 is provided with a pressure sensor 7 for measuring the liquid level pressure, the test cavity 3a is internally provided with a temperature sensor 5 for detecting the temperature of liquid in the liquid level sensor, the bottom in the test cavity 3a is provided with a magnetic stirrer 6, a thermocouple 9 for heating the liquid in the water bath heating cavity is arranged in the water bath heating cavity 4a, the other side of the bottom of the test cavity 3a is connected with a liquid discharge pipeline 11 communicated with the thermocouple, the outlet of the liquid discharge pipeline 11 is connected with a sampling bottle 13 positioned in a constant temperature device 14, and a fan 8 which is lifted in a vertical direction and is close to or far away from the liquid level of the test cavity 3a is arranged right above the test cavity 3 a.
In order to ensure the use effect, the static test device also comprises a PLC (programmable logic controller) 1, a display and an operation key, wherein the output end of the PLC is respectively connected with the input end of the display, the input end of an electromagnetic valve 12, the input end of a fan 8, the input end of a magnetic stirrer 10 corresponding to a magnetic stirrer 6 and the input end of a thermocouple 9, and the input end of the PLC is respectively connected with the output end of a pressure sensor 7, the output end of the operation key and the output end of a temperature sensor 5;
wherein:
temperature sensor: the temperature sensor is used for collecting the temperature of the test liquid in the test cavity and transmitting the temperature signal to the PLC;
thermocouple: the water bath heating device is used for receiving an on-off signal sent by the PLC, heating liquid in the water bath heating cavity through the on-off signal and heating test liquid in the test cavity in a water bath;
magnetic stirrer: the magnetic stirrer is used for receiving an on-off signal sent by the PLC and driving the magnetic stirrer in the test cavity to rotate and stir by the on-off signal so as to enable test water to be in a flowing state;
electromagnetic valve: the liquid discharge pipeline is used for receiving an opening and closing signal sent by the PLC and opening or closing the liquid discharge pipeline through the opening and closing signal;
and (3) a fan: the PLC is used for controlling the test chamber to be close to or far from the upper opening of the test chamber, the fan is turned on in the test, water vapor evaporated in the test chamber is rapidly pumped away, and meanwhile, the air flow at the upper part of the test water is increased, so that the evaporation speed is further improved;
a pressure sensor: the pressure sensor is used for measuring the pressure of the liquid level and transmitting a measured pressure signal to the PLC;
operating keys: the device is used for inputting instructions to the PLC controller and carrying out corresponding operation on each component;
and (3) a PLC controller: the temperature sensor is used for receiving a temperature signal acquired by the temperature sensor, sending an on-off signal to the thermocouple, sending a starting signal to the magnetic stirrer and sending a descending and starting signal to the fan according to the temperature signal; receiving a pressure signal sent by a pressure sensor, and sending an opening signal to an electromagnetic valve according to the pressure signal;
a display: the device is used for displaying the results after the PLC collects and outputs the signal processing, such as the temperature collected by the temperature sensor and the pressure collected by the pressure sensor, the concentration multiple of the test water obtained after the data processing, the on-off state of the fan, the thermocouple and the magnetic stirrer, and the like.
The upper end face of the outer cylinder 3 and the upper end face of the inner cylinder 4 are flush, the lower surface of the inner cylinder 4 is located right above the upper surface of the bottom face of the outer cylinder 3, an end plate 21 covering the upper opening of the water bath heating cavity is fixed between the upper end faces of the outer cylinder and the inner cylinder, the end plate 21 is provided with a desalting water adding hole 16 which is penetrated up and down, the upper opening of the inner cylinder is connected with a convex edge plate 17 which extends inwards along the circumferential direction, the center of the convex edge plate 17 is provided with a fan accommodating hole 20 for accommodating a fan, and the convex edge plate 17 is provided with an air inlet hole 18 and a temperature sensor inserting hole 19 which are penetrated up and down.
The thermocouple 9 is located between the lower surface of the inner cylinder 4 and the upper surface of the bottom surface of the outer cylinder 3.
The fan 8 accessible elevating system 15 is installed directly over test chamber 3a, elevating system is prior art, if can be for fixing the push rod motor of test chamber top and drive the fan and slide from top to bottom along vertical direction, be close to or keep away from the liquid level, laminate with test container top through the lift before the test, specifically, after the fan descends, lie in protruding fan accommodation hole 20 along board 17, open the fan in the test, take out the steam that evaporates in the container fast, the air is taken out after the inlet port 18 gets into test chamber simultaneously, increase the air flow on test water upper portion, further improve evaporation rate.
The temperature sensor is inserted into the test chamber from the temperature sensor insertion hole 19.
The outer cylinder 3 and the inner cylinder 4 are cylindrical containers made of stainless steel, the stainless steel is the same as the surface material of the heat exchanger of the production device, the conditions of the heat exchanger are closer to those of the circulating water dynamic simulation test, and the measuring accuracy is improved.
The thermostat 14 is of prior art, such as a conventional thermostat commercially available, etc. The sampling bottle is placed in water of the constant temperature device, and after the water sample enters the sampling bottle, the water sample is rapidly cooled, so that the accuracy of measurement is improved.
The circulating water limit concentration multiple static test method based on the test device comprises the following steps of:
step one, adding desalted water into a water bath heating cavity 4a of a test container;
step two, placing the magnetic stirrer 6 at the bottom of a test cavity 3a of the test container;
pouring test water into the test cavity 3a from the upper opening of the test container, observing the liquid level through the liquid level meter 2, stopping adding the test water when the liquid level reaches A (unit m), and corresponding to the test water volume V in the container A (Unit m) 3 ) At this time, the pressure sensor 7 measures a pressure P A The liquid level at the pressure sensor is B (unit m), then:
P A ＝ρ water and its preparation method g(A-B)+P 0 ，
V A ＝πr 2 A
Wherein P is 0 The standard atmospheric pressure is expressed in pa and r as the radius of the inner wall of the inner cylinder, the unit is m, and the unit is the gravitational acceleration and the unit is m/s 2 ；
Step four, adjusting the height of the fan to enable the fan to be positioned at the upper opening of the test cavity 3a and attached to the top of the test cavity;
step five, the temperature sensor 5 is inserted into the test water through a temperature sensor insertion hole 9 on the inner cylinder;
step six, starting a thermocouple 9, heating desalted water in a water bath heating cavity 4a of the test container, transferring heat through an inner cylinder made of stainless steel, heating test water to 45 ℃ in a water bath, and maintaining the temperature constant;
step seven, an electromagnetic stirrer 10 is started to drive a magnetic stirrer 6, and test water in the test cavity is stirred to enable the test water to be in a flowing state;
step eight, starting a fan 8 to quickly pump out water vapor evaporated in the container, and simultaneously increasing the air flow at the upper part of the test water to further improve the evaporation speed;
step nine, as evaporation proceeds, the test water level in the test chamber decreases, the pressure reading measured by the pressure sensor 7 also decreases, according to the formula p=ρ Water and its preparation method g(x-B)+P 0 ，V＝πr 2 x, wherein x is the current test water level height;
P、ρ water and its preparation method 、g、B、P 0 Pi and r are known quantities, and the current test water volume V can be obtained after substitution;
when the pressure sensor 7 measures the pressure P B At the time, the volume V of the test water in the corresponding test cavity B At this time, the test water concentration factor K B ＝V A /V B ；
Similarly, when the pressure sensor 7 measures the pressure P C At the time of test water concentration factor K C ＝V A /V C ；
Setting the concentration multiple K of the test water to be between K B And K is equal to C When the electromagnetic valve 12 is opened, the water sample flows through the liquid discharge pipeline 11 and enters the sampling bottle 13;
step ten, the sampling bottle 13 is placed in water of the constant temperature device 14, and after the water sample enters the sampling bottle 13, the water sample is rapidly cooled, so that the measurement accuracy is improved;
step eleven, replacing the sampling bottle, resetting the concentration multiple range, and repeating the steps 9-10 to obtain a plurality of samples;
step twelve, measuring Cl of the sample - Concentration multiple difference between concentration multiple and alkalinity ΔA or Cl - Concentration multiple and Ca 2+ And (3) concentrating the multiple difference delta B, wherein when delta A or delta B reaches 0.2, the multiple reached by evaporating and concentrating the test water is the limit concentration multiple under the test condition.
The test of the invention is as follows:
test 1
The data of the evaporation rate of a conventional method for static test of certain circulating water compared with the method are shown in Table 1.
Table 1 comparison of evaporation rate in conventional and static test of the present method
The limiting concentration multiple of the test water after adding a certain amount of scale inhibitor is about 5.0, and the test water needs to be evaporated by 20L calculated by 5L of the final retained water quantity. As can be seen from Table 1, the average evaporation rate of the conventional method was 77.0g/h, the test time was about 259.7h, the average evaporation rate of the present method was 472.4g/h, the test time was about 42.3h, and the test period was shortened by 217.4h. The test period of the method is not more than 3 days, and the time cost of test personnel is greatly reduced. Because the project needs to carry out 20 static tests, the novel method has obvious effect of improving the working efficiency.
The comparison of the test results of a conventional method and the method for static test of certain circulating water is shown in Table 2.
TABLE 2 comparison of the test results of the same test Water conventional method and the present method
As can be seen from table 2, the concentration ratio change of the sample obtained by the conventional method is negligent, the increase trend of Δa is difficult to accurately grasp, evaporation is excessive, a large amount of scale is formed in the test water, and no point of Δa near 0.2 is found. This is because, under the conventional method, as the test water evaporates, the concentration factor of the test water must be measured by sampling, which is difficult to be estimated in advance, and thus the concentration factor change of the obtained sample is neglected, the increasing trend of Δa is not easy to be grasped, and finally the obtained limit concentration factor is inaccurate or even wrong. The method is based on pressure sensor data acquisition and formula p=ρ Water and its preparation method g(x-B)+P 0 ，V＝πr 2 x，K＝V A calculating/V, and presetting the concentration multiple on a PLC controllerWhen K=1.99-2.01, K=2.99-3.01 and K=3.99-4.01, the electromagnetic valve is opened, after the result of sampling and measuring delta A, when K=4 is found, the delta A starts to rise, the concentration multiple interval of the sampled sample is reduced, the electromagnetic valve is opened when the concentration multiple K=4.49-4.51, K=4.79-4.81, K=4.99-5.01, K=5.19-5.21 and K=5.39-5.41 are set, the delta A is measured by sampling, and the limit concentration multiple is 5.21 according to the test result. It should be noted that the concentration factor K is obtained by data acquisition, analysis and processing, and is the estimated value, and the actual concentration factor is determined according to the Cl of the sample - And as a result.
Conventional method for static test of certain circulating water and concentration multiple (Cl) of the method - Meter) as a function of time from sampling to measurement interval is shown in table 3.
TABLE 3 concentration times (in Cl) - Meter) data comparison with time from sampling to measurement
As can be seen from Table 3, when the time from sampling to measurement is less than a certain value, the concentration ratio (in Cl - Meter) changes with the time from sampling to measuring, the time from sampling to measuring reaches 3min by adopting a conventional method, the concentration multiple of the sample changes to 0.04, and the time from sampling to measuring reaches 1min by adopting the method, the concentration multiple of the sample basically does not change and is smaller than an initial value.
Claims (4)
1. The utility model provides a circulating water limit concentration multiple static test device, including the test container, a serial communication port, the test container includes urceolus (3) and sets up urceolus (3) inside inner tube (4), the intermediate layer between urceolus (3) and the inner tube constitutes water bath heating chamber (4 a), inner tube (4) inner chamber constitutes test chamber (3 a), water bath heating chamber (4 a) is not mutually conducted with test chamber (3 a), one side of test chamber (3 a) bottom is connected with liquid level gauge (2) of drawing forth the outside of test container, pressure sensor (7) that are used for measuring this liquid level pressure are equipped with in liquid level gauge (2) bottom, be equipped with in test chamber (3 a) and be used for detecting its interior liquid temperature sensor (5), be provided with magnetic stirring piece (6) in test chamber (3 a), be provided with thermocouple (9) that are used for heating the interior liquid of water bath heating chamber in water bath heating chamber, be connected with drain pipeline (11) with solenoid valve (12) in the other side of test chamber bottom, the export and be located in constant temperature device (14) are located in drain pipeline (11) bottom one side, the test chamber (8) is located in the positive direction of keeping away from test chamber (8) that is located in the vertical direction of test chamber (13), the fan is kept away from;
the static test device further comprises a PLC (1), a display and operation keys, wherein the output end of the PLC is respectively connected with the input end of the display, the input end of the electromagnetic valve (12), the input end of the fan (8), the input end of the magnetic stirrer (10) corresponding to the magnetic stirrer (6) and the input end of the thermocouple (9), and the input end of the PLC is respectively connected with the output end of the pressure sensor (7), the output end of the operation keys and the output end of the temperature sensor (5);
wherein:
temperature sensor: the temperature sensor is used for collecting the temperature of the test liquid in the test cavity and transmitting the temperature signal to the PLC;
thermocouple: the water bath heating device is used for receiving an on-off signal sent by the PLC, heating liquid in the water bath heating cavity through the on-off signal and heating test liquid in the test cavity in a water bath;
magnetic stirrer: the magnetic stirrer is used for receiving an on-off signal sent by the PLC and driving the magnetic stirrer in the test cavity to rotate and stir by the on-off signal so as to enable test water to be in a flowing state;
electromagnetic valve: the liquid discharge pipeline is used for receiving an opening and closing signal sent by the PLC and opening or closing the liquid discharge pipeline through the opening and closing signal;
and (3) a fan: the PLC is used for controlling the test chamber to be close to or far from the upper opening of the test chamber, the fan is turned on in the test, water vapor evaporated in the test chamber is rapidly pumped away, and meanwhile, the air flow at the upper part of the test water is increased, so that the evaporation speed is further improved;
a pressure sensor: the pressure sensor is used for measuring the pressure of the liquid level and transmitting a measured pressure signal to the PLC;
operating keys: the device is used for inputting instructions to the PLC controller and carrying out corresponding operation on each component;
and (3) a PLC controller: the temperature sensor is used for receiving a temperature signal acquired by the temperature sensor, sending an on-off signal to the thermocouple, sending a starting signal to the magnetic stirrer and sending a descending and starting signal to the fan according to the temperature signal; receiving a pressure signal sent by a pressure sensor, and sending an opening signal to an electromagnetic valve according to the pressure signal;
a display: and the device is used for displaying the result after the acquisition and output signal processing of the PLC.
2. The circulating water limit concentration multiple static test device according to claim 1, wherein the outer cylinder (3) is flush with the upper end face of the inner cylinder (4), the lower surface of the inner cylinder (4) is positioned right above the upper surface of the bottom surface of the outer cylinder (3), an end plate (21) for covering the upper opening of the water bath heating cavity is fixed between the outer cylinder and the upper end face of the inner cylinder, a demineralized water charging hole (16) penetrating up and down is formed in the end plate (21), the upper opening of the inner cylinder is connected with a convex edge plate (17) extending inwards along the circumferential direction, a fan accommodating hole (20) for accommodating a fan is formed in the center of the convex edge plate (17), and an air inlet hole (18) and a temperature sensor inserting hole (19) penetrating up and down are formed in the convex edge plate (17) respectively.
3. The circulating water limit concentration multiple static test device according to claim 1, wherein the outer cylinder (3) and the inner cylinder (4) are cylindrical containers made of stainless steel, the stainless steel is the same as the surface material of a heat exchanger of a production device, the conditions of the circulating water dynamic simulation test are closer to those of the circulating water dynamic simulation test, and the measurement accuracy is improved.
4. A circulating water limit concentration multiple static test method based on the test device of claim 1, comprising the following steps:
step one, adding desalted water into a water bath heating cavity (4 a) of a test container;
step two, placing a magnetic stirrer (6) at the bottom of a test cavity (3 a) of the test container;
pouring test water into the test cavity (3 a) from the upper opening of the test container, observing the liquid level through the liquid level meter (2), stopping adding the test water when the liquid level reaches A, and corresponding to the test water volume V in the container A At this time, the pressure sensor (7) measures a pressure P A The liquid level at the pressure sensor is B, then:
P A ＝ρ water and its preparation method g(A-B)+P 0 ，
V A ＝πr 2 A
Wherein P is 0 The pressure is standard atmospheric pressure, r is the radius of the inner wall of the inner cylinder, and g is gravity acceleration;
step four, adjusting the height of the fan to enable the fan to be positioned at the upper opening of the test cavity (3 a) and attached to the top of the test cavity;
step five, inserting a temperature sensor (5) into the test water;
step six, starting a thermocouple (9), heating desalted water in a water bath heating cavity (4 a) of the test container, transferring heat through an inner cylinder made of stainless steel, heating test water to 45 ℃ in a water bath, and maintaining the temperature constant;
step seven, an electromagnetic stirrer (10) is started to drive a magnetic stirrer (6) to stir test water in the test cavity, so that the test water is in a flowing state;
step eight, starting a fan (8) to quickly pump out the vapor evaporated in the container, and simultaneously increasing the air flow at the upper part of the test water to further improve the evaporation speed;
step nine, as evaporation proceeds, the test water level in the test chamber decreases, the pressure reading measured by the pressure sensor (7) also decreases, according to the formula p=ρ Water and its preparation method g(x-B)+P 0 ，V＝πr 2 x, wherein x is the current test water level height;
when the pressure sensor (7) measures the pressure as P B At the time, the volume V of the test water in the corresponding test cavity B At this time, the test water concentration factor K B ＝V A /V B ；
Similarly, when the pressure sensor (7) measures the pressure P C At the time of test water concentration factor K C ＝V A /V C ；
Setting the concentration multiple K of the test water to be between K B And K is equal to C When the water sample flows through the liquid discharge pipeline (11), the electromagnetic valve (12) is opened, and the water sample enters the sampling bottle (13);
step ten, the sampling bottle (13) is placed in water of the constant temperature device (14), and after the water sample enters the sampling bottle (13), the water sample is rapidly cooled, so that the measurement accuracy is improved;
step eleven, replacing the sampling bottle, resetting the concentration multiple range, and repeating the steps 9-10 to obtain a plurality of samples;
step twelve, measuring Cl of the sample - Concentration multiple difference between concentration multiple and alkalinity ΔA or Cl - Concentration multiple and Ca 2+ And (3) concentrating the multiple difference delta B, wherein when delta A or delta B reaches 0.2, the multiple reached by evaporating and concentrating the test water is the limit concentration multiple under the test condition.
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| CN102680350B (en) * | 2012-06-01 | 2014-03-19 | 南京大学 | Scale inhibitor performance evaluation method suitable for circulating cooling water systems |
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| CN201273899Y (en) * | 2008-09-26 | 2009-07-15 | 河北省电力研究院 | Evaluation test apparatus for cyclic water scale inhibitor |
| CN203758991U (en) * | 2014-03-26 | 2014-08-06 | 西安热工研究院有限公司 | Static simulation testing device of circulating water |
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