CN112325986A - Limestone slurry circulating tank liquid level measuring device - Google Patents
Limestone slurry circulating tank liquid level measuring device Download PDFInfo
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- CN112325986A CN112325986A CN202011209934.8A CN202011209934A CN112325986A CN 112325986 A CN112325986 A CN 112325986A CN 202011209934 A CN202011209934 A CN 202011209934A CN 112325986 A CN112325986 A CN 112325986A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
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- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
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- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention discloses a liquid level measuring device of a limestone slurry circulating tank, which relates to the technical field of liquid level measurement and comprises a plastic cover with an axial section in a hyperbolic shape; the middle section of the plastic cover is inwards sunken, the diameter of the middle section is smaller than that of the top end and that of the bottom end, and the inner diameter of the plastic cover is gradually increased from the middle section to the top end and the bottom end; the upper end of the inside of the plastic cover is connected with a fixed buckle, a bayonet is arranged in the middle of the fixed buckle, and the ultrasonic liquid level meter is installed through the bayonet; the bottom end of the plastic cover is connected with a straight pipe section with internal thread, the radius of the straight pipe section is the same as that of the bottom end of the plastic cover, and the plastic cover is installed on the installation support through the straight pipe section. The invention has the advantages that: under the condition that need not external heating source, power, through the improvement of physics device, let the hot-air of ultrasonic wave level gauge below reduce as far as possible and dewfall on ultrasonic wave level gauge probe, dewfall maximize on the hyperboloid, realize the anti-dewfall maximize of device, reduce the probability that ultrasonic wave level gauge is misaligned.
Description
Technical Field
The invention relates to the technical field of liquid level measurement, in particular to a liquid level measuring device for a limestone slurry circulating tank.
Background
The flue gas desulfurization of the thermal power plant usually adopts a limestone-gypsum wet process, and limestone is prepared in a desulfurization public area. The limestone slurry prepared by the ball mill firstly enters a slurry circulating tank, and enters a limestone slurry tank for standby after the density meets the requirement. The liquid level of the limestone circulation tank is an important measurement parameter in the pulping process. When the traditional liquid level meter is installed, the liquid level meter is directly installed on the flange plate. Generally, the liquid medium does not generate steam and mist under the temperature of 30-40 ℃, while the temperature of the medium in the slurry circulating pool is about 50 ℃, the slurry in the pool is kept to continuously flow in and out, and the stirrer is not stopped, so that the steam or mist is easily generated, and the reason for causing deviation in the ultrasonic liquid level meter under the condition comes from two aspects: (1) the transmitted ultrasonic waves pass through steam to be attenuated once in the transmitting process, and are attenuated once again when being reflected from the liquid level, so that the ultrasonic signals returned to the probe are weakened, and the measuring accuracy is influenced; (2) in a steam or mist environment, the probe of the ultrasonic liquid level meter is easy to dew, and water drops can block the transmission and the reception of ultrasonic waves, even directly result in that the measurement result is a full liquid level.
In order to measure the liquid level of the area easy to dew, the current common methods are as follows: 1. the measuring range is enlarged, for example, the height of the container is 3 meters, 6-9 meters of ultrasonic liquid level meters are selected, the influence of fog on measurement is weakened, and the ultrasonic penetrating power can be really increased by adopting a large-range liquid level measuring device, but the improvement on the dew phenomenon is limited; 2. the filtering time is prolonged, the receiving of secondary waves is reduced, the filtering time is prolonged, the penetration of water vapor is effective, but the moisture condensation phenomenon is ineffective; 3. the silicone grease is coated on the probe, so that the condensation probability is reduced, the condensation aggregation can be reduced by the method of coating the silicone grease, the threshold of condensation is raised, and the additional problems, such as easy adhesion of ash and mosquito, are caused; 4. the sensor is obliquely installed, dew flows away along one side, so that the dew condensation problem of the ultrasonic liquid level meter is relieved, dew can be effectively prevented from gathering by allowing dew to flow away along one side, but the larger the inclination angle required for allowing dew to flow away as soon as possible, the larger the correction coefficient of the actual liquid level and the measured liquid level is, the correction coefficient can be changed along with the change of the angle as long as the angle is changed, and the measurement error of the angle can bring system errors; 5. the sensor probe is provided with the constant-temperature heating device, and the sensor probe is provided with the constant-temperature heating device, so that condensation can be effectively avoided, but the external energy consumption is required to be lasting.
In summary, the first three of the above 5 methods for dealing with the problems of moisture and condensation can relieve condensation to some extent, but the effect is limited, and the last two methods can better prevent condensation, but bring other problems. The invention provides a liquid level measuring device of a limestone slurry circulating tank, aiming at improving the installation of an ultrasonic liquid level meter so as to overcome the influence of water vapor and condensation and reduce the probability of condensation of a probe of the liquid level meter.
Disclosure of Invention
The invention aims to provide a liquid level measuring device for a limestone slurry circulating tank, which can solve the problem of false alarm of measurement caused by the fact that a probe of a liquid level meter is easy to dewfall.
In order to solve the technical problems, the technical scheme of the invention is as follows: comprises a plastic cover with a hyperbolic-shaped axial section;
the middle section of the plastic cover is inwards sunken, the diameter of the middle section of the plastic cover is smaller than the diameters of the top end and the bottom end, the inner diameter of the plastic cover is gradually increased from the middle section to the top end, and the inner diameter of the plastic cover is gradually increased from the middle section to the bottom end;
the upper end in the plastic cover is connected with a fixing buckle, a bayonet is arranged in the middle of the fixing buckle, the ultrasonic liquid level meter is installed through the bayonet, and a probe of the ultrasonic liquid level meter is positioned at the middle section in the plastic cover;
the bottom end of the plastic cover is connected with a straight pipe section with internal thread, the radius of the straight pipe section is the same as that of the bottom end of the plastic cover, and the plastic cover is installed on the installation support through the straight pipe section.
Further, the size of the minimum inner diameter of the middle section of the plastic cover needs to be determined by combining the width of the ultrasonic liquid level meter probe and the dew transfer effect:
if the minimum inner diameter of the middle section of the plastic cover is too large, the larger the distance between the inner wall of the plastic cover and the vertical central line of the ultrasonic liquid level meter is, the smaller the contribution of the double-curved-surface dew transfer capability of the plastic cover to the reduction of dew condensation of the ultrasonic liquid level meter is; if the minimum inner diameter of the middle section of the plastic cover is too small, the cross section area through which the mist can pass is also smaller, which is not beneficial to the flow of the mist; because the temperature change in the slurry circulating tank is small, the temperature difference change with the outside is small, the formed pressure difference change is also small, the minimum inner diameter of the middle section of the plastic cover is less influenced by the operation condition, and the minimum inner diameter of the middle section of the plastic cover is 0.1-0.15m larger than the radius of the probe of the ultrasonic liquid level meter.
Further, the greater the degree of curvature of the hyperbola of the axial section of the plastic cover, the smaller the slope, the slower the speed of transferring dew, but the larger the area facing the circulation tank; the smaller the curvature of the hyperbola of the axial section of the plastic cover, the greater the slope, the faster the speed of transferring the dew, but the smaller the area facing the circulation tank, the product of the speed of transferring the dew and the area facing the circulation tank being the measure of the dew handling capacity, the curvature of the hyperbola of the axial section of the plastic cover being determined in combination with the speed of transferring the dew and the area facing the circulation tank:
because of the symmetry of the plastic cover, a certain section is selected for calculation, and a hyperbolic equation is set
The focus satisfies equation c2＝a2+b2The asymptote of the hyperbola satisfies the equation
Assuming that the dewdrop processing capacity is Q, since the hyperbola is symmetrical, calculating the integral of the product of the slope of each segment of the hyperbola and the unit length is the dewdrop comprehensive processing capacity, and since the symmetry,
wherein R represents the radius of the straight pipe section with threads, only mist formed in a limited range around the probe of the ultrasonic liquid level meter can be condensed on the probe actually, when the size of the ultrasonic liquid level meter is determined, the parameter a of the hyperbola is also determined actually, through tests, when forced convection outside is not considered, if the distance of the ultrasonic liquid level meter far away from the slurry circulation tank reaches 2a, the influence of the mist condensation on the probe does not exist, and the value range of R is [ a, 2a ]]；
Derivation is carried out on a hyperbolic equation, and t is equal to y2；
Then
Will be provided with
Substitute, then
The integral of the above equation is carried out,
that is, the larger R is, the larger the dew processing ability theoretically becomes, the installation and the value range of R are taken into consideration, R is 2a, that is, a circle having a radius of 2a facing the area of the circulation tank, and the parameters a and R of the hyperbola are determined and the hyperbola is determined.
The invention has the advantages that: after a hyperbolic-shaped plastic cover is additionally arranged on an original flange mounting bracket of the ultrasonic liquid level meter, because the ambient temperature is lower than the temperature of slurry, the upper air and the lower air have density difference to form pressure difference, the air enters from the bottom of the plastic cover and flows out from the top of the plastic cover; the lower opening of the plastic cover is larger, air can enter more easily, the middle part is thin, the airflow is accelerated from width to width, the heat dissipation of mist is accelerated, and the heat exchange is easier; set up hyperbolic profile design, under the condition that need not exothermal source, power, through the improvement of physics device, let the hot-air of ultrasonic wave level gauge below reduce condensation on ultrasonic wave level gauge probe as far as possible, through condensation on the hyperboloid, realized the anti-condensation maximize of device, reduce the probability that the ultrasonic wave level gauge is out of alignment, system measurement's stability obtains improving.
Drawings
Fig. 1 is an axial cross-sectional view of the present invention.
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 detail with reference to the accompanying drawings and the detailed description. The following examples are presented to enable one of ordinary skill in the art to more fully understand the present invention and are not intended to limit the scope of the embodiments described herein.
As shown in fig. 1, the following technical solutions are adopted in the present embodiment: including an axial cross-section for the plastics cover 1 of hyperbola shape, the interlude 11 of plastics cover 1 is inside sunken, and the diameter of the interlude 11 of plastics cover 1 is less than the diameter of top and bottom, and the internal diameter of plastics cover 1 is crescent to the top by interlude 11, and the internal diameter of plastics cover 1 is crescent to the bottom by interlude 11.
The inside upper end 12 of plastic casing 1 is connected with fixed buckle 2, and the centre of fixed buckle 2 is equipped with the bayonet socket, and fixed buckle 2's width is very little, does not influence passing through of air current, and fixed buckle 2's width is adjusted according to ultrasonic wave level gauge 3 and is set up, and ultrasonic wave level gauge 3 passes through the bayonet socket installation and fixes, and ultrasonic wave level gauge 3's probe is located the 11 positions of the inside interlude of plastic casing 1.
The bottom end of the plastic cover 1 is connected with a straight pipe section 13 with internal thread, the radius of the straight pipe section 13 is the same as that of the bottom end of the plastic cover 1, the plastic cover 1 is installed on the installation support 4 through the straight pipe section 13, and the straight pipe section 13 with the internal thread is arranged, so that the connection and installation are convenient.
After the plastic cover 1 in a hyperbolic shape is additionally arranged on the original flange mounting bracket 4 of the ultrasonic liquid level meter, because the ambient temperature is lower than the temperature of slurry, and the density difference exists between the upper air and the lower air, so that pressure difference is formed, the air enters from the bottom of the plastic cover 1 and flows out from the top of the plastic cover 1, the lower opening of the double curved surface of the plastic cover 1 is large, the air is easier to enter, the middle is thin, the air flow is accelerated from width to width, and the heat exchange is easier; the hyperbolic shape is set, the main purpose is to reduce the condensation of hot air below the ultrasonic liquid level meter 3 on the probe of the ultrasonic liquid level meter 3 as much as possible, and the probability of misalignment of the ultrasonic liquid level meter 3 is reduced by condensation on the inner wall of the double curved surface of the plastic cover 1.
The size of the minimum inner diameter of the middle section 11 of the plastic cover 1 needs to be determined by combining the width of the probe of the ultrasonic liquid level meter 3 and the dew transfer effect:
the minimum inner diameter of the middle section 11 of the hyperbolic profile plastic cover 1 is limited by the probe width, transferring dew effect. If the minimum inner diameter of the middle section 11 of the plastic cover 1 is too large, the larger the distance between the inner wall of the plastic cover 1 and the vertical central line of the ultrasonic liquid level meter 3 is, the smaller the contribution of the double-curved-surface dew transfer capability of the plastic cover 1 to the reduction of dew condensation of the ultrasonic liquid level meter 3 is; if the minimum inner diameter of the middle section 11 of the plastic cover 1 is too small, the cross section area through which the mist can pass is also smaller, which is not beneficial to the flow of the mist; considering that the temperature change in the slurry circulating tank is small, the difference change between the temperature change and the outside temperature is small, the formed pressure difference change is also small, the influence of the operation working condition on the minimum inner diameter of the middle section 11 of the plastic cover 1 is small, and the minimum inner diameter of the middle section 11 of the plastic cover 1 is 0.1m larger than the radius of the probe of the ultrasonic liquid level meter 3.
The greater the degree of curvature of the hyperbola of the axial section of the plastic cover 1, the smaller the slope, the slower the speed of transferring the dew, but the larger the area facing the circulation tank; the smaller the curvature of the hyperbola of the axial section of the plastic enclosure 1, the greater the slope, the faster the speed of transferring the dew, but the smaller the area facing the circulation tank, the smaller the product of the speed of transferring the dew and the area facing the circulation tank as a measure of the dew handling capacity, the curvature of the hyperbola of the axial section of the plastic enclosure 1 being determined in combination with the speed of transferring the dew and the area facing the circulation tank:
because of the symmetry of the plastic cover 1, a certain section is selected for calculation, and a hyperbolic equation is set
The focus satisfies equation c2＝a2+b2The asymptote of the hyperbola satisfies the equation
Assuming that the dewdrop processing capacity is Q, since the hyperbola is symmetrical, calculating the integral of the product of the slope of each segment of the hyperbola and the unit length is the dewdrop comprehensive processing capacity, and since the symmetry,
wherein R represents the radius of the straight pipe section 13 with screw threads, in fact, only fog formed in a limited range around the probe of the ultrasonic liquid level meter 3 can be condensed on the probe, when the size of the ultrasonic liquid level meter 3 is determined, the parameter a of a hyperbola is actually determined, through tests, when forced convection outside is not considered, if the distance of the ultrasonic liquid level meter 3 away from the slurry circulation tank reaches 2a, the influence of the condensation of the fog on the probe does not exist, and the value range of R is [ a, 2a ]]；
Derivation is carried out on a hyperbolic equation, and t is equal to y2；
Then
Will be provided with
Substitute, then
The integral of the above equation is carried out,
that is, the larger R is, the larger the dew processing ability theoretically becomes, the installation and the value range of R are taken into consideration, R is 2a, that is, a circle having a radius of 2a facing the area of the circulation tank, and the parameters a and R of the hyperbola are determined and the hyperbola is determined.
Through the transformation, under the condition that an external heating source and a power supply are not needed, the dew prevention maximization of the device is realized through the improvement of the physical device, and practice proves that the frequency of dew condensation is greatly reduced. The length of a certain slurry circulating pool is about 3 meters, the width is about 2 meters, the depth is 1.8 meters, the general liquid level is controlled to be about 1.2 meters, if the ultrasonic liquid level meter 3 is condensed, the false indication is usually 1.8 meters, the ultrasonic liquid level meter 3 with the same specification is adopted, before the device is applied, the probability of false alarm is about once per week, after the hyperbolic plastic cover 1 is applied, the probability of false alarm is reduced to about once per month, the probability of condensation of a probe of the ultrasonic liquid level meter 3 is reduced, and the stability of system measurement is improved.
This embodiment installs the plastics cover of a hyperbola appearance additional on former ultrasonic wave level gauge flange mounting bracket, under the condition that need not exothermal source, power, through the improvement of physics device, lets the hot-air of ultrasonic wave level gauge below reduce the dewfall on ultrasonic wave level gauge probe as far as possible, through the dewfall on the hyperboloid, has realized the anti-dewfall maximize of device, reduces the probability that ultrasonic wave level gauge is out of alignment, and system measurement's stability obtains improving.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. The utility model provides a limestone slurry circulation pond liquid level measurement device which characterized in that: comprises a plastic cover with a hyperbolic-shaped axial section;
the middle section of the plastic cover is inwards sunken, the diameter of the middle section of the plastic cover is smaller than the diameters of the top end and the bottom end, the inner diameter of the plastic cover is gradually increased from the middle section to the top end, and the inner diameter of the plastic cover is gradually increased from the middle section to the bottom end;
the upper end in the plastic cover is connected with a fixing buckle, a bayonet is arranged in the middle of the fixing buckle, the ultrasonic liquid level meter is installed through the bayonet, and a probe of the ultrasonic liquid level meter is positioned at the middle section in the plastic cover;
the bottom end of the plastic cover is connected with a straight pipe section with internal thread, the radius of the straight pipe section is the same as that of the bottom end of the plastic cover, and the plastic cover is installed on the installation support through the straight pipe section.
2. The limestone slurry circulating tank liquid level measuring device of claim 1, wherein: the size of the minimum internal diameter of interlude of plastics cover needs to combine the width of ultrasonic wave level gauge probe and transfer dew effect to confirm:
if the minimum inner diameter of the middle section of the plastic cover is too large, the larger the distance between the inner wall of the plastic cover and the vertical central line of the ultrasonic liquid level meter is, the smaller the contribution of the double-curved-surface dew transfer capability of the plastic cover to the reduction of dew condensation of the ultrasonic liquid level meter is; if the minimum inner diameter of the middle section of the plastic cover is too small, the cross section area through which the mist can pass is also smaller, which is not beneficial to the flow of the mist; because the temperature change in the slurry circulating tank is small, the temperature difference change with the outside is small, the formed pressure difference change is also small, the minimum inner diameter of the middle section of the plastic cover is less influenced by the operation condition, and the minimum inner diameter of the middle section of the plastic cover is 0.1-0.15m larger than the radius of the probe of the ultrasonic liquid level meter.
3. The limestone slurry circulating tank liquid level measuring device of claim 1, wherein: the higher the hyperbolic curve degree of the axial section of the plastic cover is, the smaller the slope is, the slower the speed of transferring dew is, but the larger the area of the plastic cover facing the circulating pool is; the smaller the curvature of the hyperbola of the axial section of the plastic cover, the greater the slope, the faster the speed of transferring the dew, but the smaller the area facing the circulation tank, the product of the speed of transferring the dew and the area facing the circulation tank being the measure of the dew handling capacity, the curvature of the hyperbola of the axial section of the plastic cover being determined in combination with the speed of transferring the dew and the area facing the circulation tank:
because of the symmetry of the plastic cover, a certain section is selected for calculation, and a hyperbolic equation is set
The focus satisfies equation c2＝a2+b2The asymptote of the hyperbola satisfies the equation
Assuming that the dewdrop processing capacity is Q, since the hyperbola is symmetrical, calculating the integral of the product of the slope of each segment of the hyperbola and the unit length is the dewdrop comprehensive processing capacity, and since the symmetry,
wherein R represents the radius of the straight pipe section with threads, only mist formed in a limited range around the probe of the ultrasonic liquid level meter can be condensed on the probe actually, when the size of the ultrasonic liquid level meter is determined, the parameter a of the hyperbola is also determined actually, through tests, when forced convection outside is not considered, if the distance of the ultrasonic liquid level meter far away from the slurry circulation tank reaches 2a, the influence of the mist condensation on the probe does not exist, and the value range of R is [ a, 2a ]]；
Derivation is carried out on a hyperbolic equation, and t is equal to y2；
Then
Will be provided with
Substitute, then
The integral of the above equation is carried out,
that is, the larger R is, the larger the dew processing ability theoretically becomes, the installation and the value range of R are taken into consideration, R is 2a, that is, a circle having a radius of 2a facing the area of the circulation tank, and the parameters a and R of the hyperbola are determined and the hyperbola is determined.
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| CN202011209934.8A CN112325986B (en) | 2020-11-03 | 2020-11-03 | Limestone slurry circulating tank liquid level measuring device |
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| CN202011209934.8A CN112325986B (en) | 2020-11-03 | 2020-11-03 | Limestone slurry circulating tank liquid level measuring device |
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| CN209055182U (en) * | 2018-12-21 | 2019-07-02 | 华能罗源发电有限责任公司 | Protective device to improve the accuracy of ultrasonic measurement of container liquid level |
| CN211217122U (en) * | 2019-11-15 | 2020-08-11 | 郑州康宁特环境工程科技有限公司 | Supporting high temperature electrostatic precipitator system of cement trade denitration |
| CN111810911A (en) * | 2020-07-22 | 2020-10-23 | 上汽大众汽车有限公司 | A replaceable automatic moisture absorption device for automobile lamps |
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2020
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Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6411902B1 (en) * | 1999-04-19 | 2002-06-25 | Michael John Wiltshire | Shale compaction and sonic logs |
| CN1712832A (en) * | 2004-06-16 | 2005-12-28 | 富士工业株式会社 | Exhaust hood |
| CN201653498U (en) * | 2010-01-12 | 2010-11-24 | 太原科技大学 | Sensing device for measuring liquid level with ultrasonic liquid level gauge |
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| CN205027416U (en) * | 2015-10-20 | 2016-02-10 | 福建大唐国际宁德发电有限责任公司 | Rain -proof cover of ultrasonic wave level gauge |
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