CN105509463A - Infrared measuring device for kiln temperature of rotary kiln of hazardous waste incinerator - Google Patents

Infrared measuring device for kiln temperature of rotary kiln of hazardous waste incinerator Download PDF

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Publication number
CN105509463A
CN105509463A CN201510826828.7A CN201510826828A CN105509463A CN 105509463 A CN105509463 A CN 105509463A CN 201510826828 A CN201510826828 A CN 201510826828A CN 105509463 A CN105509463 A CN 105509463A
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China
Prior art keywords
infrared
pipeline
kiln
temperature
rotary kiln
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CN201510826828.7A
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Chinese (zh)
Inventor
张宁
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Nanjing Jianlei Power Technology Co Ltd
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Nanjing Jianlei Power Technology Co Ltd
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Priority to CN201510826828.7A priority Critical patent/CN105509463A/en
Publication of CN105509463A publication Critical patent/CN105509463A/en
Pending legal-status Critical Current

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Abstract

The invention discloses an infrared measuring device for a kiln temperature of a rotary kiln of a hazardous waste incinerator, and belongs to a matched device for detecting the kiln temperature of the rotary kiln. The infrared measuring device comprises an infrared measurer, and further comprises a cooling sleeve, wherein the infrared measurer is arranged on the inner part of the cooling sleeve; the cooling sleeve is provided with a hollow sandwich layer which is provided with an inlet hole and an outlet hole; the end part of the cooling sleeve is further provided with a blowing-sweeping pipe; the blowing-sweeping pipe is communicated with a pneumatic valve through a sight tube; the pneumatic valve is communicated with a gas source through a first pipeline; structures such as a protection module, a first filter pressure-regulating valve, and the like are arranged on the first pipeline; the infrared measurer is mounted on the inner part of the cooling sleeve for being combined with the blowing-sweeping pipe to carry out water-cooling heat dissipation on the infrared measurer while impurities remained on the infrared measurer are blown off by blowing-sweeping wind, so that the infrared measurer can be directly mounted in the furnace of the rotary kiln to carry out temperature measurement, and therefore, kiln temperature measuring accuracy is effectively improved, and the temperature of a furnace hearth flue gas center can be accurately measured.

Description

The kiln temperature Infrared measuring devices of danger waste burning stove rotary kiln
Technical field
The present invention relates to a kind of rotary kiln temperature detector and be measured covering device, in particular, the present invention relates generally to a kind of kiln temperature Infrared measuring devices of waste burning stove rotary kiln of endangering.
Background technology
At present, in industry, the kiln temperature of danger waste burning stove rotary kiln is measured and adopt thermocouple to measure flue-gas temperature bottom the outlet of kiln tail, dual firing chamber, indirectly judge kiln temperature.Thermocouple is arranged in the left and right sides bottom the outlet of kiln tail, dual firing chamber, first cannot measure flue gas central temperature, and there is the low deviation of 5%-10%; Next is the temperature measured is flue-gas temperature bottom dual firing chamber, and the rotary kiln internal temperature that distance is actual is distant, cannot reflect and turn kiln temperature; And due to the restriction of thermocouple environment for use and structure, under the impact of the factors such as, wearing and tearing large in temperature fluctuation and mounting means, there is the shortcomings such as thermocouple life-span short, accuracy of measurement is unstable, troublesome maintenance.Thus be necessary that the measurement mechanism structure for danger waste burning stove rotary kiln kiln temperature is done further research and improves.
Summary of the invention
An object of the present invention is for above-mentioned deficiency, a kind of kiln temperature Infrared measuring devices of waste burning stove rotary kiln of endangering is provided, to expect to solve in prior art by thermocouple indirect inspection kiln temperature, the temperature at kiln inner flue gas of the stove center cannot be measured, and there is comparatively big error in measurement result, and easily cause the technical problems such as thermocouple is damaged, and plant maintenance difficulty is large.
For solving above-mentioned technical problem, the present invention by the following technical solutions:
The kiln temperature Infrared measuring devices of a kind of waste burning stove rotary kiln of endangering provided by the present invention, comprise infrared survey instrument, described Infrared measuring devices also comprises coolant jacket, described infrared survey instrument is placed in the inside of coolant jacket, described coolant jacket has the interlayer of hollow, described interlayer is with hole and portals, for forming circulation of fluid in the interlayer of coolant jacket, the end of described coolant jacket is also provided with scavenging conduit, described scavenging conduit is connected with pneumatic operated valve by the first aiming tube, described pneumatic operated valve is connected with source of the gas by the first pipeline, described first pipeline is provided with protection module and first and filters pressure regulator valve, described first pipeline also accesses second pipe, described second pipe is also provided with the second filtration pressure regulator valve, for filtering pressure regulator valve and protection module through first successively by ducted gas one route first pipeline, scavenging conduit is entered again via pneumatic operated valve, another route second pipe filters pressure regulator valve through second and directly enters scavenging conduit, the infrared survey instrument of coolant jacket inside is blowed to again by scavenging conduit.
As preferably, further technical scheme is: described first pipeline, second pipe are connected by three-way connection with source of the gas, and the first pipeline of described three-way connection and source of the gas is also provided with hand-operated valve.
Further technical scheme is: described pneumatic operated valve is also connected with mounting flange by ring flange, and described aiming tube is also connected with pneumatic operated valve by ring flange.
Further technical scheme is: described pneumatic operated valve access protection module; and the inside of described protection module is provided with pressure sensor and controller; described pressure sensor access controller; for being detected the pressure purging wind in the first pipeline by pressure sensor; and transfer in controller; the pressure data current according to the first pipeline by controller, judges whether to automatically shut down pneumatic operated valve by the threshold range of its internal preset.
Further technical scheme is: described Infrared measuring devices is arranged on the furnace wall in danger waste burning stove by mounting flange.
Further technical scheme is: described infrared survey instrument comprises infrared sensor, photoelectric detection unit on described infrared sensor accesses signal amplifier and signal transacting and display translation unit successively, and described signal transacting and display translation unit also access external dcs; For the maximum temperature by carbon dioxide within the scope of infrared sensor acquisition field of view, and be converted to the corresponding signal of telecommunication by the photoelectric detection unit of its inside, the described signal of telecommunication carries out signal amplification and signal transacting via signal amplifier and signal transacting and display translation unit, exports dcs to carry out current temperature value display by signal transacting and display translation unit.
Further technical scheme is: described signal transacting and display translation unit export the signal of telecommunication of 4 to 20 milliamperes to dcs.
Further technical scheme is: described amplifier and signal transacting and display translation unit are integrated in same data transmitter.
Compared with prior art, one of beneficial effect of the present invention is: by infrared survey instrument being arranged on the inside of coolant jacket, while water-cooled or wind-cooling heat dissipating being carried out to infrared survey instrument in conjunction with scavenging conduit, also remove impurity residual on infrared survey instrument by purging wind, and then temperature survey is carried out in the furnace wall that infrared survey instrument can be directly installed on rotary kiln, thus effectively improve the accuracy of kiln temperature measurement, the temperature at burner hearth flue gas center can be measured accurately; And pressure and the impurity of air-flow in purging system pipeline can be controlled by filtration pressure regulator valve and protection module, effectively prevent the normal use because of gas pressure anomalous effects infrared survey instrument in purge, also avoid infrared survey instrument to be damaged; By correct measurement kiln temperature temperature, air quantity oxygen content in danger waste burning stove rotary kiln section can be controlled according to temperature data, air quantity pressure size, thus effectively improve efficiency of combustion, fuel saving; The kiln temperature Infrared measuring devices structure of a kind of waste burning stove rotary kiln of endangering provided by the present invention is simple simultaneously, and also can install and use in the danger waste burning stove rotary kiln of all kinds of specification, range of application is wide.
Accompanying drawing explanation
Fig. 1 is the structural representation for illustration of one embodiment of the invention;
Fig. 2 is the structural representation for an alternative embodiment of the invention;
Fig. 3 is for illustration of the infrared survey instrument structured flowchart in one embodiment of the invention;
In figure, 1 is coolant jacket, and 2 is inlet hole; 3 for portalling, and 4 is scavenging conduit, 5 first aiming tubes; 6 is pneumatic operated valve, and 7 is the first pipeline, and 8 is protection module; 9 is the first filtration pressure regulator valve, and 10 is second pipe, and 11 is the second filtration pressure regulator valve; 12 is three-way connection, and 13 is hand-operated valve, and 14 is mounting flange; 15 is furnace wall, and 16 is the 3rd pipeline, and 17 is the second aiming tube.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further elaborated.
Shown in figure 1, one embodiment of the present of invention are kiln temperature Infrared measuring devices of a kind of waste burning stove rotary kiln of endangering, comprise infrared survey instrument, and this measurement mechanism also has and to dispel the heat to infrared survey instrument and the structure of impurities purging, be specially in this Infrared measuring devices and also should comprise coolant jacket 1, aforementioned infrared survey instrument is arranged on the inside of coolant jacket 1, coolant jacket 1 then needs the interlayer arranging hollow, this interlayer be with hole 2 with portal 3, for forming recirculated water in the interlayer of coolant jacket 1, by inlet hole 2 with portal 3 be communicated with respective circulating water pipeline respectively after namely formed circulating water protection system carried out to infrared survey instrument, in addition, the end of coolant jacket 1 is also provided with scavenging conduit 4, this scavenging conduit 4 is connected with pneumatic operated valve 6 by the first aiming tube 5, and this pneumatic operated valve 6 is connected with source of the gas by the first pipeline 7, aforementioned first pipeline 7 is provided with protection module 8 and first and filters pressure regulator valve 9, and the first pipeline 7 also accesses second pipe 7, aforesaid second pipe 10 is provided with the second filtration pressure regulator valve 11, for filtering pressure regulator valve 9 and protection module 8 through first successively by ducted gas one route first pipeline, another route second pipe 10 filters pressure regulator valve 11 through second and directly enters scavenging conduit 4 and aiming tube 5, the external pelivimetry instrument of water collar 1 inside is blowed to again by scavenging conduit 4.By aforesaid structure, the function of infrared survey instrument being carried out to high-pressure blast purging can be realized, the impurity buildups of test side when effectively avoiding infrared survey instrument to use.
And in the present embodiment, by infrared survey instrument being arranged on the inside of coolant jacket 1, while carrying out water-cooling in conjunction with scavenging conduit 4 pairs of infrared survey instrument, also remove impurity residual on infrared survey instrument by purging wind, and then carry out temperature survey in the stove that infrared survey instrument can be directly installed on rotary kiln, thus effectively improve the accuracy of kiln temperature measurement, the temperature at burner hearth flue gas center can be measured accurately; And pressure and the impurity of air-flow in purging system pipeline can be controlled by filtration pressure regulator valve and protection module, effectively prevent the normal use because of gas pressure anomalous effects infrared survey instrument in purge, also avoid infrared survey instrument to be damaged; By correct measurement kiln temperature temperature, air quantity oxygen content in danger waste burning stove rotary kiln section can be controlled according to temperature data, air quantity pressure size, thus effectively improve efficiency of combustion, fuel saving.
According to above-mentioned purging structure, be the security that lifting device uses, the first above-mentioned pipeline 7, second pipe 10 can be connected by three-way connection 12 with source of the gas, and on three-way connection 12 with the first pipeline 7 of source of the gas, hand-operated valve 13 is installed again; And then enter the first pipeline 7 with second pipe 10 by this hand-operated valve 13 gas controlled in source of the gas; And use above-mentioned source of the gas can be air pump in reality of the present invention, will be inputted after air pressurized in the first pipeline 7 and second pipe 10 by air pump.
Further, inventor also considers that the use of stability to whole device that above-mentioned all parts connects plays vital effect, therefore preferably above-mentioned pneumatic operated valve 6 is connected with mounting flange 15 by ring flange in the present embodiment, aiming tube 5 is also connected with pneumatic operated valve 4 by ring flange; The effect of aforementioned mounting flange 15 phase is arranged on by Infrared measuring devices on the furnace wall 16 in danger waste burning stove; Thus realize above-mentioned measurement function.
In the embodiment that the present invention is more preferably for technical solution problem, just as mentioned above, for avoiding the pressure anomaly in the first pipeline and second pipe (when mainly referring to decompression or low pressure), the test side of infrared survey instrument is made even to cause damage because impurity buildups too much affects certainty of measurement; Above-mentioned pneumatic operated valve 6 directly can be accessed protection module 8; and the inside of protection module 8 should at least arrange pressure sensor and controller; described pressure sensor access controller; for being detected the pressure purging wind in the first pipeline 7 by pressure sensor; and transfer in controller; the pressure data current according to the first pipeline 7 by controller, judges whether to automatically shut down pneumatic operated valve 6 by the threshold range of its internal preset.
Shown in composition graphs 2, be used for, in an embodiment being more preferably of technical solution problem, comprising infrared survey instrument in the present invention, this measurement mechanism also has and to dispel the heat to infrared survey instrument and the structure of impurities purging, be specially in this Infrared measuring devices and also should comprise coolant jacket 1, aforementioned infrared survey instrument is arranged on the inside of coolant jacket 1, coolant jacket 1 then needs the interlayer arranging hollow, this interlayer be with hole 2 with portal 3, for forming circulated air in the interlayer of coolant jacket 1, by inlet hole 2 with portal 3 be communicated with the 3rd pipeline 16 respectively after namely formed circulated air cooling protection system carried out to infrared survey instrument, aforesaid 3rd pipeline 16 is connected with the first pipeline 7, in addition, the end of coolant jacket 1 is also provided with scavenging conduit 4, this scavenging conduit 4 is connected with pneumatic operated valve 6 by aiming tube 5, and this pneumatic operated valve 6 is connected with source of the gas by the first pipeline 7, aforementioned first pipeline 7 is provided with protection module 8 and first and filters pressure regulator valve 9, this first pipeline 7 is also connected with second pipe 10, aforesaid second pipe 10 is provided with the second filtration pressure regulator valve 11, for filtering pressure regulator valve 9 and protection module 8 through first successively by ducted gas one route first pipeline, another route second pipe 10 filters pressure regulator valve 11 through second and directly enters scavenging conduit 4 and aiming tube 5, the external pelivimetry instrument of water collar 1 inside is blowed to again by scavenging conduit 4.By aforesaid structure, the function of infrared survey instrument being carried out to high-pressure blast purging can be realized, the impurity buildups of test side when effectively avoiding infrared survey instrument to use.
According to above-mentioned purging structure, be the security that lifting device uses, the first above-mentioned pipeline 7, second pipe the 10, three pipeline 16 can be connected by three-way connection with source of the gas, and install hand-operated valve 13 again on the main pipeline of source of the gas; And then enter the first pipeline 7 with second pipe the 10, three pipeline 16 by this hand-operated valve 13 gas controlled in source of the gas; Portal and 3 to be connected by threeway with 2# aiming tube 17, and install check valve additional, prevent high-temperature flue gas in burner hearth from overflowing.
Shown in composition graphs 3, in the embodiment that the present invention is more preferably for technical solution problem, infrared sensor should be comprised in above-mentioned infrared survey instrument, photoelectric detection unit on infrared sensor accesses signal amplifier and signal transacting and display translation unit successively, and described signal transacting and display translation unit also access external dcs; For the maximum temperature by carbon dioxide within the scope of infrared sensor acquisition field of view, and be converted to the corresponding signal of telecommunication by the photoelectric detection unit of its inside, the described signal of telecommunication carries out signal amplification and signal transacting via signal amplifier and signal transacting and display translation unit, exports dcs to carry out current temperature value display by signal transacting and display translation unit.Just as mentioned previously, signal transacting and display translation unit export the signal of telecommunication of 4 to 20 milliamperes to dcs.
Further, the integrated structure for ease of device is arranged, and above-mentioned amplifier and signal transacting and display translation unit can be integrated in same data transmitter.
As mentioned here above, infrared radiation thermometer is the core component of whole measurement mechanism.Can be made up of parts such as optical system, photodetector (both form infrared sensor jointly), signal amplifier, signal transacting and display translation unit substantially.Optical system converges the Target Infrared Radiation energy in its visual field, and the size of visual field is determined by the optical element of temperature transducer and position thereof.Focus infrared energy is on photodetector and change the corresponding signal of telecommunication into.This signal through amplifier and signal processing circuit, and changes the temperature value of measured target into after correcting according to the algorithm of both inside and backs.And aforesaid infrared sensor is by the hot CO of monitoring 2gas carrys out thermometric, and owing to adopting the film thermopile of the infrared filter of particular design, sensor is through adjusting in advance, and its infrared spectrum response is preset as particular detection CO 2gaseous spectrum, only accepts CO 2the energy of special infrared light spectral coverage, the infrared energy of other wavelength all by filtering, only to hot CO 2gaseous spectrum is responsive, as the CO in visual field 2when gas is heated to specific temperature range, sensor can directly be used for measuring the CO in visual field 2maximum gas temperature, effectively excludes the interference of other environmental factors, can measure burner hearth flue gas central temperature accurately.
Based on the above embodiments of the present invention, the position of Infrared measuring devices can be installed on kiln tail just on direction dual firing chamber furnace wall, dual firing chamber's operational characteristic determines that it can not open measurement for a long time, needs to use flange to be connected on furnace wall by temperature measuring equipment, guarantees the opposing seal of burner hearth.But when incinerator operation exception, positive pressure gas stream may be had the high temperature in stove is taken out of, damage temperature measuring equipment; For adapting to the operating characteristic of incinerator industry, develop the protective device meeting incinerator feature specially, this protective device can guarantee temperature element long-time stable work on furnace wall, thermometric guard system protection temperature transducer long-play, measuring tempeature is converted to 4-20mA signal and delivers to DCS(dcs by transmitter) display; Cooling protection system (water collar 1 and the pipeline be communicated with it) can protect instrument long-time stable work under the environment of the highest 315 DEG C (water-cooleds); Voltage loss protecting system can detect airline pressure automatically, when pressure anomaly (when decompression or low pressure), automatically shuts down pneumatic operated valve, to protect instrument.
Than that described above; it should be noted that; the DCS(dcs mentioned in the present embodiment), the structure of the protection module and infrared survey instrument with pressure sensor and controller forms; same category of device of the prior art all can be adopted to assemble and to obtain Infrared measuring devices of the present invention; one of main purpose of the present invention utilizes the online chamber flue gas temperature continuous measurement of the functional realiey of aforementioned device; and keep the function of equipment stable operation; therefore for the structure of aforementioned device and the principle of respective functional realiey, no longer describe in detail herein.
Also it should be noted that spoken of in this manual " embodiment ", " another embodiment ", " embodiment " etc., refer to the specific features, structure or the feature that describe in conjunction with this embodiment and be included at least one embodiment of the application's generality description.Multiple place occurs that statement of the same race is not necessarily refer to same embodiment in the description.Furthermore, when describing specific features, structure or a feature in conjunction with any embodiment, what advocate is also fall within the scope of the invention to realize this feature, structure or feature in conjunction with other embodiments.
Although with reference to multiple explanatory embodiment of the present invention, invention has been described here, but, should be appreciated that, those skilled in the art can design a lot of other amendment and embodiment, these amendments and embodiment will drop within spirit disclosed in the present application and spirit.More particularly, in the scope of, accompanying drawing open in the application and claim, multiple modification and improvement can be carried out to the building block of subject combination layout and/or layout.Except the modification of carrying out building block and/or layout is with except improvement, to those skilled in the art, other purposes also will be obvious.

Claims (8)

1. the kiln temperature Infrared measuring devices of waste burning stove rotary kiln of endangering, comprise infrared survey instrument, it is characterized in that: described Infrared measuring devices also comprises coolant jacket (1), described infrared survey instrument is placed in the inside of coolant jacket (1), described coolant jacket (1) has the interlayer of hollow, described interlayer is with hole (2) and portals (3), for forming circulation of fluid in the interlayer of coolant jacket (1), the end of described coolant jacket (1) is also provided with scavenging conduit (4), described scavenging conduit (4) is connected with pneumatic operated valve (6) by the first aiming tube (5), described pneumatic operated valve (6) is connected with source of the gas by the first pipeline (7), described first pipeline (7) is provided with protection module (8) and first and filters pressure regulator valve (9), described first pipeline (7) also accesses second pipe (7), described second pipe (10) is also provided with the second filtration pressure regulator valve (11), for filtering pressure regulator valve (9) and protection module (8) through first successively by ducted gas one route first pipeline, scavenging conduit (4) is entered again via pneumatic operated valve (6), another route second pipe (10) filters pressure regulator valve (11) through second and directly enters scavenging conduit (4), the inner infrared survey instrument of coolant jacket (1) is blowed to again by scavenging conduit (4).
2. the kiln temperature Infrared measuring devices of danger waste burning stove rotary kiln according to claim 1, it is characterized in that: described first pipeline (7), second pipe (10) are connected by three-way connection with source of the gas, first pipeline (7) of described three-way connection and source of the gas is also provided with hand-operated valve (13).
3. the kiln temperature Infrared measuring devices of danger waste burning stove rotary kiln according to claim 1 and 2, it is characterized in that: described pneumatic operated valve (6) is also connected with mounting flange (14) by ring flange, described aiming tube (5) is also connected with pneumatic operated valve (6) by ring flange.
4. the kiln temperature Infrared measuring devices of danger waste burning stove rotary kiln according to claim 3; it is characterized in that: described pneumatic operated valve (6) access protection module (8); and the inside of described protection module (8) is at least provided with pressure sensor and controller; described pressure sensor access is controller; for being detected the pressure purging wind in the first pipeline (7) by pressure sensor; and transfer in controller; the pressure data current according to the first pipeline (7) by controller, judges whether to automatically shut down pneumatic operated valve (6) by the threshold range of its internal preset.
5. the kiln temperature Infrared measuring devices of danger waste burning stove rotary kiln according to claim 3, is characterized in that: described Infrared measuring devices is arranged on the furnace wall (15) in danger waste burning stove by mounting flange (14).
6. the kiln temperature Infrared measuring devices of the danger waste burning stove rotary kiln according to claim 1 or 4, it is characterized in that: described infrared survey instrument comprises infrared sensor, photoelectric detection unit on described infrared sensor accesses signal amplifier and signal transacting and display translation unit successively, and described signal transacting and display translation unit also access external dcs; For the maximum temperature by carbon dioxide within the scope of infrared sensor acquisition field of view, and be converted to the corresponding signal of telecommunication by the photoelectric detection unit of its inside, the described signal of telecommunication carries out signal amplification and signal transacting via signal amplifier and signal transacting and display translation unit, exports dcs to carry out current temperature value display by signal transacting and display translation unit.
7. the kiln temperature Infrared measuring devices of danger waste burning stove rotary kiln according to claim 6, is characterized in that: described signal transacting and display translation unit export the signal of telecommunication of 4 to 20 milliamperes to dcs.
8. the kiln temperature Infrared measuring devices of danger waste burning stove rotary kiln according to claim 7, is characterized in that: described amplifier and signal transacting and display translation unit are integrated in same data transmitter.
CN201510826828.7A 2015-11-25 2015-11-25 Infrared measuring device for kiln temperature of rotary kiln of hazardous waste incinerator Pending CN105509463A (en)

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CN201510826828.7A CN105509463A (en) 2015-11-25 2015-11-25 Infrared measuring device for kiln temperature of rotary kiln of hazardous waste incinerator

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109028048A (en) * 2018-05-29 2018-12-18 中国电建集团河北省电力勘测设计研究院有限公司 A kind of circulating fluidized bed boiler
CN112903114A (en) * 2021-02-02 2021-06-04 陈颜颜 Infrared thermometer with quick cooling mechanism

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US20120224045A1 (en) * 2011-02-28 2012-09-06 John Anthony Rotole Method and apparatus for real time video imaging of the snout interior on a hot dip coating line
CN102706459A (en) * 2012-06-21 2012-10-03 华东理工大学 Detection device and method for three-dimensional temperature field in combustion chamber of single-CCD imaging system
CN202928693U (en) * 2012-11-27 2013-05-08 长岭炼化岳阳工程设计有限公司 Incinerator hearth high temperature detection system

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Publication number Priority date Publication date Assignee Title
US5603746A (en) * 1995-10-31 1997-02-18 Bethlehem Steel Corporation Method and apparatus to determine and control the carbon content of steel in a BOF vessel
CN1548806A (en) * 2003-05-21 2004-11-24 吉林市瑞达自控工程有限责任公司 Flame detecting method and apparatus for single burner
CN101413826A (en) * 2008-12-01 2009-04-22 浙江大学 Temperature field distribution non-contact measuring method in danger wastes thermal decomposition incineration furnace
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109028048A (en) * 2018-05-29 2018-12-18 中国电建集团河北省电力勘测设计研究院有限公司 A kind of circulating fluidized bed boiler
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CN112903114A (en) * 2021-02-02 2021-06-04 陈颜颜 Infrared thermometer with quick cooling mechanism

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Application publication date: 20160420