CN102778267A - Method for detecting level of materials in high-temperature storage bin - Google Patents
Method for detecting level of materials in high-temperature storage bin Download PDFInfo
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- CN102778267A CN102778267A CN2012102709530A CN201210270953A CN102778267A CN 102778267 A CN102778267 A CN 102778267A CN 2012102709530 A CN2012102709530 A CN 2012102709530A CN 201210270953 A CN201210270953 A CN 201210270953A CN 102778267 A CN102778267 A CN 102778267A
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Abstract
Provided is a method for detecting level of materials in a high-temperature storage bin. The method is mainly used for detecting the level of steelmaking dedusting ash, thermocouples are respectively installed at a high position and a low position, when the temperature of the thermocouple at the low position is high than that of the thermocouple at the high position, and the temperature difference of the thermocouple at the high position and the thermocouple at the low position exceeds 10% of a thermocouple range, the level of the materials in the storage bin is between the high position and the low position; when no temperature difference exists between the thermocouple at the low position and the thermocouple at the high position, and the measuring value of the thermocouples is close to the temperature value of the materials, the level of the materials in the storage bin is as high as the high position; and when no temperature difference exists between the thermocouple at the low position and the thermocouple at the high position and the measuring value of the thermocouples is lower than the temperature value of the materials, the level of the materials in the storage bin is lower than the low position measuring position. The method is small in investment, good in using effect, low in failure rate and low in operation rate.
Description
Technical field
The present invention is mainly used in steel production enterprise, belongs to the thermopair application, is specifically related to a kind of method that detects high temperature feed bin thing position.
Background technology
In the metallurgy industry, many high temperature feed bins need the actual thing position in the online detection feed bin in order to guarantee production safety, are used for preventing the too high or low excessively industrial accident that causes of material level.
Because the different internal temperature difference of medium are bigger in the feed bin, from normal temperature to the hundreds of, degree centigrade do not wait.It is a difficult problem that material level under the high temperature detects always.
Traditional high temperature feed bin adopts capacitance level meter usually; Because the feed bin internal temperature is very high; Capacitance level meter often before use the phase can satisfy the production needs basically, but failure rate begins to raise after the use of short time, have in addition lose the function that material level detects.How to guarantee the detection of material level, the expense that reduces spare part simultaneously is a problem that is worth research.
Summary of the invention
In order to realize the position probing of high temperature feed bin, reduce simultaneously and produce maintenance cost, the present invention provides a kind of method that detects high temperature feed bin thing position.
Technical conceive of the present invention is to realize the judgement to material level through the internal temperature that thermopair detects feed bin because the heat-resisting quantity of thermopair own is fabulous, and the capacity of heat transmission of air very a little less than.Therefore, can from suitable position two K type thermopairs be installed, be used for detecting the temperature of two positions of height according to technological requirement.When low level resistance and temperature during far above high-order temperature, the expression material level is higher than low level and is lower than a high position.When two temperature are all high, represent that material level is higher than a high position.Two temperature signals can be realized the detection of material level in the feed bin after the computing relatively in PLC.
Technical scheme of the present invention is: select a high-order measuring position and a low level measuring position respectively at the high temperature feed bin; In high-order measuring position and low level measuring position an identical thermopair is installed respectively respectively; When the temperature of low level measuring position thermopair is higher than the temperature of high-order measuring position thermopair; Temperature difference between the temperature of low level measuring position thermopair and the high-order measuring position thermopair surpasses 10% o'clock of thermopair range; The material level of expression feed bin is higher than the low level measuring position and is lower than high-order measuring position, and promptly the material level of feed bin is in low level measuring position and high-order measuring position; Between the temperature of low level measuring position thermopair and high-order measuring position thermopair, do not have temperature difference, and the material temperature value was more or less the same at 10% o'clock in the measured value of thermopair and the feed bin, the material level of the expression feed bin measuring position that attains to a high place; When not having the measured value of temperature difference and two thermopairs to be lower than in the feed bin material temperature value at least 10% between the temperature of low level measuring position thermopair and the high-order measuring position thermopair, the material level of expression feed bin is lower than the low level measuring position; The temperature signal of two thermopairs can be realized the detection of material level in the feed bin after the computing relatively in PLC.
Between the temperature of two thermopairs, there is not temperature difference, when the measured value of thermopair approaches the measured medium temperature, the material level measuring position that attains to a high place of expression feed bin.Equally, when the measured value that does not have temperature difference and two thermopairs between the thermopair during, represent that actual material level is lower than lower limit far below the measured medium temperature.The temperature signal of two thermopairs can be realized the detection of material level in the feed bin after the computing relatively in PLC.
Described high-order measuring position is positioned at the height and position of feed bin height 80%;
Described low level measuring position is positioned at the height and position of feed bin height 20%;
Described thermopair is a K type thermopair, and the scope of the measurement temperature commonly used of K type thermopair can adapt to high temperature feed bin demand fully up to 1200 ℃.
Because the heat-resisting quantity of thermopair own is fabulous, and the capacity of heat transmission of air very a little less than.Small investment of the present invention, result of use is good, and failure rate is low, and operating cost is low.
Embodiment
Embodiment is that Taiyuan Iron and Steel Co. processing factory shaft furnace cyclone system ash-storing bin material level detects.
Present embodiment uses the measured value of the temperature measuring set of measuring dust as the measured medium temperature value in the feed bin.
The ash-storing bin material is body coning, and 2 meters high, and the height that is provided with 1.6 meters is the feed bin high charge level; The height that is provided with 0.4 meter is the low material level of feed bin, at high charge level and low material level place a k type thermopair is installed respectively respectively.Temperature signal directly gets into shaft furnace main body PLC system, and CPU adopts Siemens's 416 types, and the temperature signal of two thermopairs can be realized the online detection of material level in the feed bin after the computing relatively in PLC.
When the low level thermocouple measurement to temperature value＞k type thermopair range of measuring of temperature value-high-grade heat galvanic couple 10% the time; The material level of expression feed bin is higher than the low level measuring position and is lower than high-order measuring position (explaining that material level is normal), and promptly the material level of feed bin is in low level measuring position and high-order measuring position; When the measured value that does not have temperature difference and k type thermopair between the thermopair of high and low position was lower than the measured medium temperature value in 10% feed bin at least, the expression material level was lower than the low material level of feed bin.
When the temperature value of two thermopairs all high, the time represent feed bin the material level measuring position that attains to a high place.
Claims (3)
1. method that detects high temperature feed bin thing position; It is characterized in that selecting a high-order measuring position and a low level measuring position respectively at the high temperature feed bin; In high-order measuring position and low level measuring position an identical thermopair is installed respectively respectively; When the temperature of low level measuring position thermopair is higher than the temperature of high-order measuring position thermopair; Temperature difference between the temperature of low level measuring position thermopair and the high-order measuring position thermopair surpasses 10% o'clock of thermopair range, and the material level of expression feed bin is higher than the low level measuring position and is lower than high-order measuring position, and promptly the material level of feed bin is in low level measuring position and high-order measuring position; Between the temperature of low level measuring position thermopair and high-order measuring position thermopair, do not have temperature difference, and the material temperature value was more or less the same at 10% o'clock in the measured value of thermopair and the feed bin, the material level of the expression feed bin measuring position that attains to a high place; When not having the measured value of temperature difference and two thermopairs to be lower than in the feed bin material temperature value at least 10% between the temperature of low level measuring position thermopair and the high-order measuring position thermopair, the material level of expression feed bin is lower than the low level measuring position; The temperature signal of two thermopairs can be realized the detection of material level in the feed bin after the computing relatively in PLC.
2. a kind of method that detects high temperature feed bin thing position according to claim 1 is characterized in that described high-order measuring position is positioned at the height and position of feed bin height 80%; Described low level measuring position is positioned at the height and position of feed bin height 20%.
3. a kind of method that detects high temperature feed bin thing position according to claim 1 is characterized in that described thermopair adopts K type thermopair; Described PLC adopts Siemens's 416 types.
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| CN2012102709530A CN102778267A (en) | 2012-08-01 | 2012-08-01 | Method for detecting level of materials in high-temperature storage bin |
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| CN2012102709530A CN102778267A (en) | 2012-08-01 | 2012-08-01 | Method for detecting level of materials in high-temperature storage bin |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107305139A (en) * | 2016-04-25 | 2017-10-31 | 中冶长天国际工程有限责任公司 | Material-level detecting device and method |
| CN107305140A (en) * | 2016-04-25 | 2017-10-31 | 中冶长天国际工程有限责任公司 | A kind of material-level detecting device and method |
| CN107505022A (en) * | 2017-08-04 | 2017-12-22 | 河南龙成煤高效技术应用有限公司 | High-temperature material position detecting device and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107305139A (en) * | 2016-04-25 | 2017-10-31 | 中冶长天国际工程有限责任公司 | Material-level detecting device and method |
| CN107305140A (en) * | 2016-04-25 | 2017-10-31 | 中冶长天国际工程有限责任公司 | A kind of material-level detecting device and method |
| CN107505022A (en) * | 2017-08-04 | 2017-12-22 | 河南龙成煤高效技术应用有限公司 | High-temperature material position detecting device and method |
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Application publication date: 20121114 |