CN112325986B - Limestone slurry circulating tank liquid level measuring device - Google Patents
Limestone slurry circulating tank liquid level measuring device Download PDFInfo
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- CN112325986B CN112325986B CN202011209934.8A CN202011209934A CN112325986B CN 112325986 B CN112325986 B CN 112325986B CN 202011209934 A CN202011209934 A CN 202011209934A CN 112325986 B CN112325986 B CN 112325986B
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- level meter
- dew
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- 239000007788 liquid Substances 0.000 title claims abstract description 70
- 239000002002 slurry Substances 0.000 title claims abstract description 24
- 235000019738 Limestone Nutrition 0.000 title claims abstract description 12
- 239000006028 limestone Substances 0.000 title claims abstract description 12
- 229920003023 plastic Polymers 0.000 claims abstract description 82
- 239000004033 plastic Substances 0.000 claims abstract description 82
- 238000009833 condensation Methods 0.000 claims abstract description 33
- 230000005494 condensation Effects 0.000 claims abstract description 33
- 239000000523 sample Substances 0.000 claims abstract description 30
- 238000005259 measurement Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 13
- 239000003595 mist Substances 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 12
- 238000012546 transfer Methods 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 4
- 238000002474 experimental method Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 238000006467 substitution reaction Methods 0.000 claims description 3
- 230000006872 improvement Effects 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 230000002265 prevention Effects 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 241000255925 Diptera Species 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention discloses a limestone slurry circulating tank liquid level measuring device, which relates to the technical field of liquid level measurement and comprises a plastic cover with a hyperbolic axial section; the middle section of the plastic cover is inwards concave, the diameter of the middle section is smaller than the diameters of the top end and 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 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 of the plastic cover, and the plastic cover is arranged on the mounting bracket through the straight pipe section. The invention has the advantages that: under the condition that an external heating source and a power supply are not needed, through improvement of a physical device, hot air below the ultrasonic liquid level meter is enabled to reduce condensation on the probe of the ultrasonic liquid level meter as much as possible, condensation on the hyperboloid is reduced, condensation prevention maximization of the device is achieved, and the probability of misalignment of the ultrasonic liquid level meter is reduced.
Description
Technical Field
The invention relates to the technical field of liquid level measurement, in particular to a liquid level measurement device of a limestone slurry circulating tank.
Background
The flue gas desulfurization of a thermal power plant usually adopts a limestone-gypsum wet process, and limestone is prepared from a desulfurization public area. The limestone slurry prepared by the ball mill firstly enters a slurry circulation 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. The traditional level gauge is installed on the flange directly during installation. Generally, the liquid medium can not generate steam and fog below 30-40 ℃, the temperature of the medium in the slurry circulation tank is about 50 ℃, the slurry is kept continuously in and out of the tank and the stirrer is kept running, steam or fog is easy to generate, and the ultrasonic level meter causes deviation under the condition from two aspects: (1) The emitted ultrasonic wave is attenuated once when passing through steam in the emission process, and is attenuated once when being reflected back from the liquid level, so that the ultrasonic signal returned to the probe is weakened, and the measurement accuracy is affected; (2) Under steam or fog environment, the ultrasonic liquid level meter probe is easy to dew, water drops can obstruct the emission and the receiving of ultrasonic waves, and even the measuring result is the full liquid level.
In order to cope with the liquid level measurement in the dew condensation area, the methods commonly used at present are as follows: 1. the range is enlarged, for example, the container height is 3 meters, an ultrasonic liquid level meter with the size of 6-9 meters is selected, the influence of fog on measurement is weakened, a liquid level measuring device with a large range is adopted, the ultrasonic penetrating force can be truly enlarged, but the improvement on the dewing phenomenon is limited; 2. the filtering time is prolonged, the secondary wave reception is reduced, the filtering time is prolonged, the penetration of water vapor is effective, but the condensation phenomenon is not effective; 3. the silicone grease is smeared on the probe, so that the condensation probability is reduced, the condensation aggregation can be reduced, the threshold of condensation is raised, and additional problems such as easy ash adhesion and mosquito adhesion are caused; 4. the sensor is obliquely arranged, dew flows along one side, so that the dew condensation problem of the ultrasonic liquid level meter is relieved, the dew is effectively prevented from gathering by obliquely arranging the sensor, but the larger the inclination angle required by the dew to flow as soon as possible, the larger the correction coefficients of the actual liquid level and the measured liquid level are, the correction coefficients are changed along with the change of the angle, and the measurement error of the angle also causes the systematic error; 5. the sensor probe is provided with the constant temperature heating device, so that dew condensation can be effectively avoided, and durable external energy consumption is required.
In summary, the above 5 methods for dealing with the problems of water vapor and condensation, the former three methods can alleviate condensation to some extent, but have limited effects, and the latter two methods can well prevent condensation, but bring about other problems. The invention provides a limestone slurry circulating tank liquid level measuring device, which is intended to improve 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 solve the technical problem of providing a limestone slurry circulating tank liquid level measuring device which can solve the problem that false alarm occurs in measurement due to the fact that a probe of a liquid level meter is prone to condensation.
In order to solve the technical problems, the technical scheme of the invention is as follows: comprises a plastic cover with a hyperbolic axial section;
the middle section of the plastic cover is recessed inwards, 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 of the inside of the plastic cover is connected with a fixed buckle, a bayonet is arranged in the middle of the fixed buckle, an ultrasonic liquid level meter is arranged through the bayonet, and a probe of the ultrasonic liquid level meter is positioned at the middle section of the inside of the plastic cover;
the bottom 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 of the plastic cover, and the plastic cover is arranged on the mounting bracket through the straight pipe section.
Further, the minimum inner diameter of the middle section of the plastic cover is determined by combining the width of the ultrasonic liquid level meter probe and the dew transferring 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 center line of the ultrasonic liquid level meter is, the smaller the contribution of the hyperboloid dew transferring capability of the plastic cover to the reduction of the 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 smaller, so that the flow of the mist is not facilitated; the change of the temperature in the slurry circulation tank is smaller, the change of the pressure difference formed by the slurry circulation tank and the outside temperature difference is also smaller, the minimum inner diameter of the middle section of the plastic cover is less influenced by the operation working 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 hyperbolic curvature of the axial cross-section of the plastic cover, the smaller the slope, the slower the speed of transferring dew, but the greater the area facing the circulation tank; the smaller the hyperbolic curve of the axial section of the plastic cover is, the larger the slope is, the faster the dew is transferred, but the smaller the area opposite to the circulating pool is, and the product of the dew transfer speed and the area opposite to the circulating pool is taken as a measure of dew processing capacity, and the hyperbolic curve of the axial section of the plastic cover is required to be determined by combining the dew transfer speed and the area opposite to the circulating pool:
due to the symmetry of the plastic cover, a certain section is selected for calculation, and a hyperbolic equation is setThe focus satisfies equation c 2 ＝a 2 +b 2 The asymptote of the hyperbola satisfies the equation +.>
Assuming that the dew processing capacity is Q, since the hyperbola is symmetrical, calculating the integral of the product of the slope of each section of the hyperbola and the unit length is the dew integrated processing capacity, since the symmetry,wherein R represents the radius of a straight pipe section with threads, in practice, mist formed in a limited range around the probe of the ultrasonic liquid level meter can be condensed on the probe, when the size of the ultrasonic liquid level meter is determined, the parameter a of the hyperbola is also determined in practice, through experiments, when the external forced convection is not considered, if the distance of the ultrasonic liquid level meter away from a slurry circulating pool reaches 2a, the probe has no influence of mist condensation, so the R takes the value range of [ a,2a ]]；
Derivative the hyperbolic equation to let t=y 2 ；
Then
Will beSubstitution, then->
The above-mentioned method is integrated with respect to the above-mentioned method,
the larger R is, the larger the dew processing capability is theoretically, the comprehensive consideration is given to the installation and the value range of R, R=2a is taken, namely, the area right opposite to the circulating pool is a circle with the radius of 2a, the parameters a and R of the hyperbola are determined, and the hyperbola is determined.
The invention has the advantages that: after a hyperbolic plastic cover is additionally arranged on an original ultrasonic liquid level meter flange mounting bracket, because the ambient temperature is lower than the temperature of slurry, the air on the upper part and the lower part has density difference to form pressure difference, and wind 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 large, so that air is easy to enter, the middle is thin, the air flow is accelerated from wide to narrow, the heat dissipation of fog is accelerated, and the heat exchange is easier; the hyperbolic profile design is arranged, under the condition that an external heating source and a power supply are not needed, hot air below the ultrasonic liquid level meter is reduced to form condensation on the probe of the ultrasonic liquid level meter as much as possible through the improvement of a physical device, and the condensation prevention maximization of the device is realized through condensation on the hyperboloid, so that the misalignment probability of the ultrasonic liquid level meter is reduced, and the measurement stability of the system is improved.
Drawings
Fig. 1 is a schematic axial cross-section 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 further described in detail below with reference to the accompanying drawings and detailed description. The following examples will provide those skilled in the art with a more complete understanding of the present invention and are not intended to limit the invention to the embodiments described.
As shown in fig. 1, the following technical scheme is adopted in this specific embodiment: the plastic cover 1 with the hyperbolic axial section is included, the middle section 11 of the plastic cover 1 is recessed inwards, the diameter of the middle section 11 of the plastic cover 1 is smaller than that of the top end and the bottom end, the inner diameter of the plastic cover 1 is gradually increased from the middle section 11 to the top end, and the inner diameter of the plastic cover 1 is gradually increased from the middle section 11 to the bottom end.
The inside upper end 12 of plastics cover 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 the passage of air current, and fixed buckle 2's width is adjusted according to ultrasonic liquid level meter 3 and is set up, and ultrasonic liquid level meter 3 passes through bayonet socket installation fixedly, and the probe of ultrasonic liquid level meter 3 is located the inside interlude 11 position of plastics cover 1.
The bottom of the plastic cover 1 is connected with a straight pipe section 13 with internal threads, the radius of the straight pipe section 13 is the same as that of the bottom of the plastic cover 1, the plastic cover 1 is arranged on the mounting bracket 4 through the straight pipe section 13, and the straight pipe section 13 with internal threads is arranged, so that connection and installation are facilitated.
After the original ultrasonic liquid level meter flange mounting bracket 4 is additionally provided with the hyperbolic plastic cover 1, because the ambient temperature is lower than the temperature of slurry, the air on the upper part and the lower part has density difference to form pressure difference, wind enters from the bottom of the plastic cover 1 and flows out from the top of the plastic cover 1, the hyperbolic lower opening of the plastic cover 1 is large, the air is easier to enter, the middle is thin, the air flow is accelerated from the width to the narrow, and the heat exchange is easier; the hyperbolic profile is arranged, and the main purpose is to enable hot air below the ultrasonic liquid level meter 3 to reduce condensation on the probe of the ultrasonic liquid level meter 3 as much as possible, and reduce the misalignment probability of the ultrasonic liquid level meter 3 through condensation on the hyperbolic inner wall of the plastic cover 1.
The minimum inner diameter of the middle section 11 of the plastic cover 1 is determined by combining the width of the probe of the ultrasonic liquid level meter 3 and the dew transferring effect:
the minimum inner diameter of the middle section 11 of the hyperbolic profile plastic shell 1 is limited by the probe width and the effectiveness of the transfer dew. 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 hyperboloid dew transferring capability of the plastic cover 1 to the reduction of the 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 smaller the sectional area of mist can pass through, which is not beneficial to the flow of the mist; considering that the temperature change in the slurry circulation tank is smaller and the change of the difference between the slurry circulation tank and the outside temperature is smaller, the formed pressure difference change is also smaller, the minimum inner diameter of the middle section 11 of the plastic cover 1 is less influenced by the operation working condition, and the minimum inner diameter of the middle section 11 of the plastic cover 1 is only required to be 0.1m larger than the radius of the probe of the ultrasonic liquid level meter 3.
The greater the degree of hyperbolic curvature of the axial section of the plastic cover 1, the smaller the slope, the slower the speed of transferring dew, but the greater the area facing the circulation tank; the smaller the hyperbolic curve of the axial section of the plastic cover 1, the larger the slope, the faster the dew transfer speed, but the smaller the area facing the circulation tank, and taking the product of the dew transfer speed and the area facing the circulation tank as a measure of dew processing capacity, the hyperbolic curve of the axial section of the plastic cover 1 needs to be determined by combining the dew transfer speed and the area facing the circulation tank:
due to the symmetry of the plastic cover 1, a certain section is selected for calculation, and a hyperbolic equation is setThe focus satisfies equation c 2 ＝a 2 +b 2 The asymptote of the hyperbola satisfies the equation +.>
Assuming that the dew processing capacity is Q, since the hyperbola is symmetrical, calculating the integral of the product of the slope of each section of the hyperbola and the unit length is the dew integrated processing capacity, since the symmetry,where R represents the radius of the threaded straight pipe section 13, in fact, only mist formed in a limited range around the probe of the ultrasonic level gauge 3 will condense on the probe, when the ultrasonic level gauge 3 is sizedIn the determination, the parameter a of the hyperbola is actually determined, and through experiments, when the distance of the ultrasonic liquid level meter 3 from the slurry circulating pool reaches 2a without considering external forced convection, the probe has no influence of mist condensation, so that the R value range is [ a,2a ]]；
Derivative the hyperbolic equation to let t=y 2 ；
Then
Will beSubstitution, then->
The above-mentioned method is integrated with respect to the above-mentioned method,
the larger R is, the larger the dew processing capability is theoretically, the comprehensive consideration is given to the installation and the value range of R, R=2a is taken, namely, the area right opposite to the circulating pool is a circle with the radius of 2a, the parameters a and R of the hyperbola are determined, and the hyperbola is determined.
Through the transformation, under the condition of no need of an external heat source or a power supply, the device can prevent condensation from being maximized through the improvement of a physical device, and the frequency of condensation is greatly reduced through practice. The length of a certain slurry circulation tank 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, the false indication probability is about once per week before the device is applied, the false indication probability is reduced to about once per month after the hyperbolic plastic cover 1 is applied, the probe condensation probability of the ultrasonic liquid level meter 3 is reduced, and the stability of system measurement is improved.
According to the embodiment, the hyperbolic plastic cover is additionally arranged on the original flange mounting bracket of the ultrasonic liquid level meter, under the condition that an external heat source and a power supply are not needed, hot air below the ultrasonic liquid level meter is enabled to reduce condensation on the probe of the ultrasonic liquid level meter as much as possible through improvement of a physical device, and through condensation on the hyperboloid, the maximization of condensation prevention of the device is realized, the misalignment probability of the ultrasonic liquid level meter is reduced, and the stability of system measurement is improved.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. The utility model provides a lime stone thick liquid circulation pond liquid level measurement device which characterized in that: comprises a plastic cover with a hyperbolic axial section;
the middle section of the plastic cover is recessed inwards, 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 of the inside of the plastic cover is connected with a fixed buckle, a bayonet is arranged in the middle of the fixed buckle, an ultrasonic liquid level meter is arranged through the bayonet, and a probe of the ultrasonic liquid level meter is positioned at the middle section of the inside of 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 arranged on the mounting bracket through the straight pipe section;
the greater the hyperbolic curve degree of the axial section of the plastic cover, the smaller the slope, the slower the dew transfer speed, but the larger the area facing the circulating pool; the smaller the hyperbolic curve of the axial section of the plastic cover is, the larger the slope is, the faster the dew is transferred, but the smaller the area opposite to the circulating pool is, and the product of the dew transfer speed and the area opposite to the circulating pool is taken as a measure of dew processing capacity, and the hyperbolic curve of the axial section of the plastic cover is required to be determined by combining the dew transfer speed and the area opposite to the circulating pool:
due to the symmetry of the plastic cover, a certain section is selected for calculation, and a hyperbolic equation is setThe focus satisfies equation c 2 ＝a 2 +b 2 The asymptote of the hyperbola satisfies the equation +.>
Assuming that the dew processing capacity is Q, since the hyperbola is symmetrical, calculating the integral of the product of the slope of each section of the hyperbola and the unit length is the dew integrated processing capacity, since the symmetry,wherein R represents the radius of a straight pipe section with threads, in practice, mist formed in a limited range around the probe of the ultrasonic liquid level meter can be condensed on the probe, when the size of the ultrasonic liquid level meter is determined, the parameter a of the hyperbola is also determined in practice, through experiments, when the external forced convection is not considered, if the distance of the ultrasonic liquid level meter away from a slurry circulating pool reaches 2a, the probe has no influence of mist condensation, so the R takes the value range of [ a,2a ]]；
Derivative the hyperbolic equation to let t=y 2 ；
Then
Will beSubstitution, then->
The above-mentioned method is integrated with respect to the above-mentioned method,
the larger R is, the larger the dew processing capability is theoretically, the comprehensive consideration is given to the installation and the value range of R, R=2a is taken, namely, the area right opposite to the circulating pool is a circle with the radius of 2a, the parameters a and R of the hyperbola are determined, and the hyperbola is determined.
2. A limestone slurry recirculation tank level measuring device as defined in claim 1, wherein: the minimum inner diameter of the middle section of the plastic cover is determined by combining the width of the ultrasonic liquid level meter probe and the dew transferring 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 center line of the ultrasonic liquid level meter is, the smaller the contribution of the hyperboloid dew transferring capability of the plastic cover to the reduction of the 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 smaller, so that the flow of the mist is not facilitated; the change of the temperature in the slurry circulation tank is smaller, the change of the pressure difference formed by the slurry circulation tank and the outside temperature difference is also smaller, the minimum inner diameter of the middle section of the plastic cover is less influenced by the operation working 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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN112325986A CN112325986A (en) | 2021-02-05 |
| CN112325986B true CN112325986B (en) | 2024-04-16 |
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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 | Replaceable automatic moisture absorption device for automobile lamp |
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2020
- 2020-11-03 CN CN202011209934.8A patent/CN112325986B/en active Active
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 |
| CN203069237U (en) * | 2013-02-06 | 2013-07-17 | 陕西理工学院 | Wireless ultrasonic level gauge |
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| CN112325986A (en) | 2021-02-05 |
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