CN1908601B - Method and equipment for continuously measuring temperature of high-temp liquid - Google Patents
Method and equipment for continuously measuring temperature of high-temp liquid Download PDFInfo
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- CN1908601B CN1908601B CN2006100529487A CN200610052948A CN1908601B CN 1908601 B CN1908601 B CN 1908601B CN 2006100529487 A CN2006100529487 A CN 2006100529487A CN 200610052948 A CN200610052948 A CN 200610052948A CN 1908601 B CN1908601 B CN 1908601B
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- 239000007788 liquid Substances 0.000 title claims abstract description 123
- 238000000034 method Methods 0.000 title claims description 24
- 230000005855 radiation Effects 0.000 claims abstract description 26
- 238000009529 body temperature measurement Methods 0.000 claims description 19
- 238000003780 insertion Methods 0.000 claims description 13
- 230000037431 insertion Effects 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 6
- 239000013307 optical fiber Substances 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 5
- 239000000523 sample Substances 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002356 single layer Substances 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 3
- 238000000691 measurement method Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 54
- 239000010959 steel Substances 0.000 description 54
- 238000013178 mathematical model Methods 0.000 description 4
- 239000000155 melt Substances 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229910003465 moissanite Inorganic materials 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000008447 perception Effects 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 230000005457 Black-body radiation Effects 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000004737 colorimetric analysis Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000004861 thermometry Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The disclosed temperature continual measurement method for hot liquid comprises: a. inserting the closed end of temperature tube into the hot liquid; b. measuring height of the liquid level; c. connecting last two devices; d. measuring analyzing the thermal radiation and liquid level variation to obtain the true temperature, wherein the applied devices are mentioned above.
Description
Technical field
The present invention relates to temperature of high-temp liquid and measure particularly a kind of continuously measuring temperature of high-temp liquid method and device.
Background technology
In the production run of metallurgical and glass etc., realize to the continuous coverage of motlten metal, glass equitemperature to the adjustment production technology, cut down the consumption of energy, improve the quality significant.
Notification number is that the Chinese patent of CN1116593C discloses " a kind of liquid steel temperature method for continuous measuring and temperature tube ", and concrete grammar is: a temperature tube is provided, and this temperature tube is a complex pipe, and inside and outside two sleeve pipes all are end openings, end sealing; The blind end of described temperature tube is inserted in the molten steel, and the length of insertion is equal to or greater than 15 with the ratio of the internal diameter of described temperature tube, with the ratio of the external diameter of described temperature tube greater than 3; The other end of described temperature tube is linked to each other with temperature measurer; By described temperature measurer described temperature tube is inserted the heat radiation of sending the inner sleeve end in the molten steel and analyze, thereby calculate the temperature of molten steel.The know-why of described patent of invention is to utilize the blackbody radiation thermometric, and after satisfying described proportionate relationship, complex pipe is similar to black matrix.But this method also has deficiency: in the molten steel smelting process, the liquid level of molten steel is constantly to change, and when liquid level drops to when making temperature tube insert molten steel length not satisfy described proportionate relationship, temperature tube just can not be used as black matrix, so just causes thermometric to be forbidden, and error is big.And when liquid steel level was low, because the influence of conducting heat is in the accurately temperature of perception molten steel of the following temperature tube of liquid level, its sense temperature was lower than molten steel actual temperature.
Notification number is that the Chinese patent of CN2729672Y discloses a kind of " high-temp liquid temperature measuring equipment ", the working method of this device is: the temperature of individual layer temperature tube perception high-temp liquid is also sent heat radiation, optical system in the sighting tube receives the radiation light-wave of temperature tube bottom and send the photoelectric colorimetry sensor, photoelectric sensor carries out filtering and beam split to light signal, and sending photoelectric cell to be converted to electric signal the infrared light of two different wave lengths, intelligence instrument records actual temperature according to electric signal.Though color comparison temperature measurement can be avoided the influences to measuring such as dust, when testee is not grey body, has error equally.This patent does not solve the high temperature level change equally to temperature tube effective emissivity and temperature tube Temperature Influence problem.
Summary of the invention
In order to solve above shortcomings in the prior art, the invention provides a kind of temperature measurement accuracy higher continuously measuring temperature of high-temp liquid method and device.
For achieving the above object, the present invention adopts the continuous coverage of following method realization to temperature of high-temp liquid:
A., the temperature tube of one one end opening, end sealing is provided and its blind end is inserted in the high-temp liquid; B., a high-temp liquid liquid surface measuring device is provided, records the height of high-temp liquid liquid level in the high temperature molten bath; C. described temperature tube is linked to each other with temperature measurer with liquid surface measuring device; D. heat radiation, the high-temp liquid liquid level variation of the end in the described temperature tube insertion high-temp liquid being sent by described temperature measurer analyzed, thereby calculates the temperature of high-temp liquid.
In the described steps d, calculate the physical length that described temperature tube inserts liquid level by the altitude gauge of knowing the high-temp liquid liquid level, obtain the actual transmission rate of described temperature tube inwall and the deviation of described temperature tube sense temperature and molten steel actual temperature by Theoretical Calculation or empirical data, temperature measurer compensates the heat radiation of measuring according to actual transmission rate and temperature deviation, thereby calculates the temperature of high-temp liquid.
Among the described step b, use weight method to record the height of high-temp liquid liquid level in the high temperature molten bath.
In the described steps d, described temperature measurer utilizes radiation temperature measurement or brightness thermometric or color comparison temperature measurement technology.
Described temperature tube is mono-layer tube or complex pipe, and described complex pipe is nested together by inner and outer pipe and constitutes, and internal and external casing all is end openings, end sealing.
Described high-temp liquid comprises motlten metal or melten glass.
For realizing said method, the invention allows for a kind of like this continuously measuring temperature of high-temp liquid device, described device comprises that an end is suitable for inserting high-temp liquid with the temperature tube of sense temperature, the temperature measurer that is connected with the temperature tube other end; Described device also comprises and is used to measure the level change of high-temp liquid and the high-temp liquid liquid surface measuring device that is connected with described temperature measurer, thereby described temperature measurer and high-temp liquid liquid surface measuring device cooperate the temperature of continuous temperature measurement high-temp liquid.
Described high-temp liquid liquid surface measuring device comprises pressure transducer or the fluid level measuring gauge that is installed in the high-temp liquid bottom.
Described temperature measurer is radiation temperature measurement or brightness thermometric or color comparison temperature measurement device.
Described temperature tube is mono-layer tube or complex pipe, and described complex pipe is nested together by inner and outer pipe and constitutes, and internal and external casing all is end openings, end sealing.
Know-why of the present invention is: in the radiation temperature measurement field, the length that temperature tube is inserted into melt liquid can influence the effective emissivity of temperature tube inwall.Table 1 has shown when the melt liquid temperature is 1500 ℃ that internal diameter is the average effective emissivity of bottom target surface in the Φ 26mm temperature tube and the relation that temperature tube inserts the melt liquid degree of depth.As can be seen from Table 1, be benchmark to insert melt liquid (as molten steel) degree of depth 300mm, when insertion depth became 100mm, the difference of target surface average effective emissivity was 0.012456, the temperature deviation that brings thus is 5.42 ℃.When this shows that inserting the melt liquid degree of depth does not satisfy the blackbody cavity condition, the temperature measurement error that is brought is sizable.
The variation that it is pointed out that melt liquid temperature itself also can influence the effective emissivity of temperature tube, thereby causes the inaccurate of thermometric.But show that by theoretical analysis the variation of the temperature tube effective emissivity that the melt liquid temperature variation is caused is very little, can ignore.Table 2 is fallen into a trap and is let it pass when insertion melt liquid (as the molten steel) degree of depth is 100mm, and different melt liquid temperature are to the influence of emissivity.As can be seen from Table 2, if the temperature of supposition melt liquid (as molten steel) is 1500 ℃, emissivity difference during with 1400 ℃ and 1600 ℃ is respectively 0.00043 and 0.00041, and the temperature deviation that brings thus is 0.1914 ℃ and 0.18301 ℃, and visible deviation is very little.
Also it is pointed out that insert melt liquid when temperature tube length more in short-term because the heat radiation that exists influences, temperature tube sense temperature and melt liquid (as molten steel) actual temperature also has deviation.As shown in table 3, when the molten steel actual temperature is 1500 ℃, the temperature that temperature tube records under the different insertion depth situations, as when insertion depth is 50mm, the sense temperature of temperature tube and actual temperature deviation have reached 5 ℃, and this deviation can not be ignored.Along with the change of temperature tube insertion depth is big, this deviation diminishes gradually.
According to analysis of Heat Transfer and theory of radiation research, according to technical scheme of the present invention, owing to considered that the high-temp liquid level change is to the influence of temperature tube effective emissivity and to the influence of sense temperature and actual temperature deviation, therefore, no matter temperature tube inserts how many molten steel degree of depth is, whether satisfy the condition of blackbody cavity, do not influence the accuracy of continuously measuring temperature of high-temp liquid.
Description of drawings
Fig. 1 is the structural representation of a kind of continuously measuring temperature of high-temp liquid device of the present invention;
Fig. 2 is the structural representation of another kind of continuously measuring temperature of high-temp liquid device of the present invention;
Fig. 3 is the structural representation of a kind of temperature tube of the present invention;
Fig. 4 is the structural representation of another kind of temperature tube of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is done further detailed description.
Embodiment 1:
As shown in Figure 1, be used to realize the device that temperature of high-temp liquid carried out the method for continuous coverage according to of the present invention, be applied in the ladle 6 in molten steel 7 continuous temperature measurements, described device comprises temperature tube 2, temperature measurer and the liquid surface measuring device 5 that is connected with temperature measurer.Described temperature measurer is a radiation temperature measurement device, comprises the temperature probe 3, optical fiber 4, the signal processor 1 that are installed in temperature tube 2 one ends.Described liquid surface measuring device 5 is installed in the bottom of ladle 6 as pressure transducer, utilizes weight method to record the liquid level of molten steel 7.Can certainly reach described pressure transducer of generation with devices such as liquid level gauges.To the liquid steel temperature continuous coverage time, temperature tube 2 is fixed on the lid 8, thereby inserts in the molten steel 7.
Described temperature tube 2 adopts composite pipe structure, and as shown in Figure 3, internal and external casing 21,22 all is an end opening, end sealing, and blind end is inserted in the molten steel 7.Outer tube 21 can select that some high temperature resistant, anti-slags are invaded, corrosion-resistant material for use, as Al
2O
3, C or Al
2O
3, C, Zr or SiC.Interior pipe 22 is selected some emissivity height, high temperature resistant, nonvolatile material for use, as Al
2O
3In addition, the outer wall of outer tube 21 preferably scribbles inoxidzable coating, improves the resistance to corrosion to molten steel 7.
Process to molten steel 7 continuously measuring temperatures is described below.At first temperature tube 2 is inserted in the molten steel 7, infrared radiation is sent in the bottom of temperature tube 2; Liquid steel level measurement mechanism 5 records the height of molten steel 7 liquid levels; Temperature probe 3 receives the infrared radiation signal that send temperature tube 2 bottoms, and delivers to signal processor 1 by optical fiber 4, and the molten steel 7 liquid level signals that record simultaneously are feed signals processor 1 also; Signal processor 1 obtains temperature tube 2 according to the liquid level signal and is inserted into length in the molten steel 7, and according to the mathematical model of signal processor 1 stored or theoretical and empirical data (as obtaining) by table 1 interpolation thus calculate the effective emissivity of temperature tube 2 in real time; Simultaneously when molten steel 7 liquid levels are low, owing to reason temperature tubes such as heat radiation 2 sense temperature at this moment is lower than molten steel 7 actual temperatures, therefore also need the sense temperature that records is compensated, mathematical model that this compensation can be by signal processor 1 stored or theory and empirical data (as obtaining by table 3 interpolation) are carried out; Temperature measurer at this moment just can be by the infrared radiation signal of temperature tube 2 bottoms that receive, the deviation of the effective emissivity of the temperature tube 2 that utilization obtains and temperature tube 2 sense temperature and molten steel actual temperature compensates recording signal, goes out the true temperature of molten steel 7 by the radiation temperature measurement technique computes.
Table 1
Target surface average effective emissivity (liquid steel temperature is 1500 ℃, different cavity insertion depths)
| Insertion depth (mm) | 100 | 150 | 200 | 300 | 400 |
| Target surface average effective emissivity | 0.985973 | 0.992495 | 0.996044 | 0.998329 | 0.998974 |
Table 2
Target surface average effective emissivity (insertion depth is 100mm, the situation of different liquid steel temperatures)
| Liquid steel temperature (℃) | 1400 | 1500 | 1520 | 1540 | 1560 | 1580 | 1600 |
| Target surface average effective emissivity | 0.986306 | 0.985873 | 0.985703 | 0.985650 | 0.985600 | 0.985717 | 0.985459 |
Table 3
Temperature tube record temperature (liquid steel temperature is 1500 ℃, and temperature tube is under different insertion depths)
| Insertion depth (mm) | 50 | 80 | 100 |
| Record temperature (K) | 1767.5 | 1770.37 | 1771.28 |
Embodiment 2:
As shown in Figure 2, be used to realize according to of the present invention liquid steel temperature is carried out the device of the method for continuous coverage, be applied in the ladle 6 in molten steel 7 continuous temperature measurements, described device comprises temperature tube 2, temperature measurer and the liquid surface measuring device 5 that is connected with temperature measurer.Described temperature measurer is a color comparison temperature measurement device, comprises the temperature probe 3, light-dividing device 9, optical fiber 4,10 and the signal processor 1 that are installed in temperature tube 2 one ends.Liquid surface measuring device 5 is installed in the bottom of ladle 6 as pressure transducer, utilizes weight method to record the liquid level of molten steel 7.Certainly can also reach described pressure transducer of generation with devices such as liquid level gauges.To molten steel 7 continuously measuring temperatures the time, temperature tube 2 is fixed on the lid 8, thereby inserts in the molten steel 7.
Described temperature tube 2 adopts the single tube structure, as shown in Figure 4, temperature tube 2 one end openings, end sealing, blind end is inserted in the molten steel 7.The material of temperature tube 2 can be selected Al for use
2O
3, C or Al
2O
3, C, Zr or SiC, outer wall preferably scribbles inoxidzable coating, improves the resistance to corrosion of 2 pairs of molten steel 7 of temperature tube.
Process to molten steel 7 continuously measuring temperatures is described below.At first temperature tube 2 is inserted in the molten steel 7, infrared radiation is sent in the bottom of temperature tube 2; Liquid steel level measurement mechanism 5 records the height of liquid steel level; Temperature probe 3 receives the infrared radiation signal that send the temperature tube bottom, and deliver to light-dividing device 9 by optical fiber 4, the light that is divided into the two-way different wave length by light-dividing device 9, two ways of optical signals is by optical fiber 10 feed signals processors 1 afterwards, and the molten steel 7 liquid level signals that record simultaneously are feed signals processor 1 also; Signal processor 1 obtains the length that temperature tube 2 is inserted into molten steel 7 according to liquid level information, and calculates the effective emissivity of temperature tube 2 in real time according to the mathematical model of signal processor 1 stored or theoretical and empirical data (as obtaining by above-mentioned table 1 interpolation); Simultaneously when molten steel 7 liquid levels are low, owing to reason temperature tubes such as heat radiation 2 sense temperature at this moment is lower than molten steel 7 actual temperatures, therefore also need the sense temperature that records is compensated, mathematical model that this compensation can be by signal processor 1 stored or theory and empirical data (as obtaining by table 3 interpolation) are carried out; Temperature measurer at this moment just can be by the infrared radiation signal of temperature tube 2 bottoms that receive, the deviation of the effective emissivity of the temperature tube 2 that utilization obtains and temperature tube 2 sense temperature and molten steel actual temperature compensates recording signal, goes out the true temperature of molten steel 7 by the color comparison temperature measurement technique computes.
It is pointed out that above-mentioned embodiment should not be construed as limiting the scope of the invention.Such as above-mentioned temperature measurer can also adopt the brightness thermometry, and high-temp liquid also can be other motlten metal or glass etc.Key of the present invention is, by adding the high-temp liquid liquid surface measuring device, records liquid level variation in real time, and then obtains the effective emissivity of temperature tube in real time by temperature measurer, and the sense temperature of the temperature tube that records is compensated, thereby reaches accurate thermometric.Under the situation that does not break away from spirit of the present invention, any type of change that the present invention is made all should fall within protection scope of the present invention.
Claims (7)
1. continuously measuring temperature of high-temp liquid method comprises step:
A., the temperature tube of one one end opening, end sealing is provided and its blind end is inserted in the high-temp liquid;
B., a high-temp liquid liquid surface measuring device is provided, and this measurement mechanism uses weight method to record the height of high-temp liquid liquid level in the high temperature molten bath;
C. described temperature tube is linked to each other with temperature measurer with liquid surface measuring device;
D. heat radiation, the high-temp liquid liquid level variation of the end in the described temperature tube insertion high-temp liquid being sent by described temperature measurer measured and analyzed, thereby calculates the temperature of high-temp liquid, is specially:
Calculate the physical length that described temperature tube inserts liquid level by the altitude gauge of knowing the high-temp liquid liquid level;
According to described physical length, and obtain the actual transmission rate of described temperature tube inwall by Theoretical Calculation or empirical data; Draw the deviation of described temperature tube sense temperature and high-temp liquid actual temperature by Theoretical Calculation or empirical data;
The heat radiation that temperature measurer sends the end of temperature tube according to actual transmission rate and deviation compensates, thereby calculates the temperature of high-temp liquid.
2. method according to claim 1 is characterized in that: in the described steps d, described temperature measurer utilizes radiation temperature measurement or brightness thermometric or color comparison temperature measurement technology.
3. method according to claim 1 is characterized in that: described temperature tube is mono-layer tube or complex pipe, and described complex pipe is nested together by inner and outer pipe and constitutes, and inner and outer pipes all is end openings, end sealing.
4. method according to claim 1 is characterized in that: described high-temp liquid comprises motlten metal or melten glass.
5. continuously measuring temperature of high-temp liquid device, described device comprises that an end is suitable for inserting high-temp liquid with the temperature tube of sense temperature, the temperature measurer that is connected with the temperature tube other end; Described temperature measurer comprises temperature probe, optical fiber and the signal processor of the described other end that is installed in temperature tube; It is characterized in that: described device also comprises:
Be used to measure the high-temp liquid liquid surface measuring device of the level change of high-temp liquid, this liquid surface measuring device is connected with described signal processor, and this liquid surface measuring device comprises the pressure transducer that is installed in the high-temp liquid bottom;
Thereby described temperature measurer and high-temp liquid liquid surface measuring device cooperate the temperature of continuous measuring high-temperature liquid:
Signal processor draws the physical length that temperature tube inserts high-temp liquid according to the output signal of pressure transducer;
Signal processor obtains the actual transmission rate of described temperature tube inwall and the deviation of described temperature tube sense temperature and high-temp liquid actual temperature according to described physical length by Theoretical Calculation or empirical data;
The heat radiation that signal processor sends the end of the temperature tube that records according to described actual transmission rate and deviation compensates, thereby calculates the temperature of high-temp liquid.
6. continuously measuring temperature of high-temp liquid device according to claim 5 is characterized in that: described temperature measurer is radiation temperature measurement or brightness thermometric or color comparison temperature measurement device.
7. continuously measuring temperature of high-temp liquid device according to claim 5 is characterized in that: described temperature tube is mono-layer tube or complex pipe, and described complex pipe is nested together by inner and outer pipe and constitutes, and inner and outer pipes all is end openings, end sealing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100529487A CN1908601B (en) | 2006-08-10 | 2006-08-10 | Method and equipment for continuously measuring temperature of high-temp liquid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100529487A CN1908601B (en) | 2006-08-10 | 2006-08-10 | Method and equipment for continuously measuring temperature of high-temp liquid |
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| CN1908601A CN1908601A (en) | 2007-02-07 |
| CN1908601B true CN1908601B (en) | 2010-12-29 |
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| CN2006100529487A Expired - Fee Related CN1908601B (en) | 2006-08-10 | 2006-08-10 | Method and equipment for continuously measuring temperature of high-temp liquid |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1333455A (en) * | 2000-07-12 | 2002-01-30 | 东北大学 | Method for continuous measuring molten steel temperature and temp. measuring tube |
| CN1527932A (en) * | 2001-07-27 | 2004-09-08 | 新日本制铁株式会社 | Temperature measuring device and temperature measuring method for molten metal |
| CN2729672Y (en) * | 2004-09-14 | 2005-09-28 | 吴爱华 | Apparatus for measuring temp. of high-temp liquid |
-
2006
- 2006-08-10 CN CN2006100529487A patent/CN1908601B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1333455A (en) * | 2000-07-12 | 2002-01-30 | 东北大学 | Method for continuous measuring molten steel temperature and temp. measuring tube |
| CN1527932A (en) * | 2001-07-27 | 2004-09-08 | 新日本制铁株式会社 | Temperature measuring device and temperature measuring method for molten metal |
| CN2729672Y (en) * | 2004-09-14 | 2005-09-28 | 吴爱华 | Apparatus for measuring temp. of high-temp liquid |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平7-12651A 1995.01.17 |
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