CN205119787U - Rotary kiln furnace temperature measurement system - Google Patents
Rotary kiln furnace temperature measurement system Download PDFInfo
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- CN205119787U CN205119787U CN201520822959.3U CN201520822959U CN205119787U CN 205119787 U CN205119787 U CN 205119787U CN 201520822959 U CN201520822959 U CN 201520822959U CN 205119787 U CN205119787 U CN 205119787U
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Abstract
The utility model discloses a rotary kiln furnace temperature measurement system, it includes: fluoresent coating on the gyration kiln outer wall, laser emitter, the fluorescence receiver, the spectrum appearance, photomultiplier and image sensor and computer main control unit, wherein, laser emitter passes through optic fibre and links to each other with the computer main control unit, fluorescence receiver, spectrum appearance, photomultiplier and image sensor, that the computer main control unit passes through optic fibre is consecutive. The utility model discloses a laser induced flourescense temperature measuring system, the temperature of material in can accurate measurement rotary kiln kiln.
Description
Technical field
The application belongs to kiln temperature field of measuring technique, relates to temperature measurement system in a kind of kiln.
Background technology
Rotary kiln is a kind of high temperature kiln of continuous rotation, and in rotary kiln, each point temperature detection is whether accurate, plays conclusive effect to the mass rate of production of product, energy resource consumption, cost and device security running.The rotational characteristic of rotary kiln brings inconvenience to the temperature in Measurement accuracy rotary kiln body.Therefore the important means measured accurately, rotary kiln temp measuring system to the mensuration of kiln internal temperature and control is guarantee rotary kiln normal production operation is reliably selected.Although the some precision of thermometer conventional are at present higher, as Beckman thermometer, QJ-85 direct current comparison expression bridge for measuring temperature etc., but complex structure, use and extremely bother, inconvenient, high temperature measurement cannot be carried out in kiln and temperature signal transmission is very complicated, more can not monitor as long-distance transmissions, be difficult to the requirement meeting production operation.
Instrument is adopted to detect the temperature of each reaction zone material of rotary kiln continuously at DCS master-control room, not only to heated material temperature regime in understanding rotary kiln, improving technique operant level, improve grog product quality, reduce fuel consumption, extend operating period of rotary kiln etc. and there is important function, and realize also being absolutely necessary in rotary kiln Automated condtrol process parameter.
Current measurement means is pocket type thermal detector mainly, needing the carcass parts measuring temperature of charge, opening a circular hole, being welded on trunk outer wall by the bag of outsourcing copper coin, embedded light fire brick.The refractory brick of light fire brick and kiln liner makes to become a bag-shaped cavity (being commonly called as sack) by processing finishing, as holding the material treating testing temperature, inserts temperature-sensing element-thermocouple in bag.
Bag rotates with rotary kiln, when rotary kiln rotation makes bag be in kiln shell bottom, namely fills the material needing measuring tempeature in bag.In the process that rotary kiln is rotated further, material heats thermocouple, the temperature making thermocouple reach rapidly material to have, and this temperature value is transformed to corresponding electromotive force millivolt value, deliver on revolution kiln hood instrument panel through compensating wire, collector ring, carbon brush, delivery guidewire, indicated by electron potentiometer and record out.When rotary kiln rotate to make bag be in kiln shell top time, the material of tested excess temperature in bag, namely drops by bag by gravity, sack turn, for bag continue to go to the loading of kiln body bottom new treat that the material of testing temperature is got ready.Go round and begin again according to the order of this loading material-detect-turn-reload material, circulation is gone down, and can detect the temperature of this reaction zone material continuously.
After running after a while, be stuck in bag or granular material heaps bonding in bag because lump material squeezes, sack blocked, hampers the renewal of material in bag, cause detection to carry out.Especially when the action need of kiln stops kiln temporarily, and when at this moment bag is by chance in kiln shell bottom, this phenomenon is just even more serious.
Once the fault that generation sack blocks, because bag is an entirety, and be welded on trunk, so cannot get rid of outward at kiln, must wait during kiln periodic inspection and enter in kiln and can get rid of.
A kind of rotary kiln noctovisor scan instrument thermometry is disclosed in prior art, noctovisor scan instrument is utilized to receive the infrared ray of kliner coating transmitting, measure the temperature of kliner coating, then by certain reduction formula Skin temperature is converted to the temperature in kiln, indirectly can understands the situation of material in kiln.But the indirect measurement method hysteresis quality of this technology is larger, larger by the temperature of charge error calculated.
Utility model content
The utility model is mainly for kiln similar production rotating machinery inside temperature measurement.The key of kiln production operation be the control to temperature, temperature controlling range be generally ± about 25 DEG C, if temperature is too low, then various physical-chemical reaction carries out slowly, is difficult to reach kiln operating effect; Can bring product sex change when reaction temperature exceedes kiln design temperature, can not get required product, and plant energy consumption also correspondingly can increase, temperature is too high comparatively large to equipment loss degree, has a strong impact on the service life of equipment.Only have and measured kiln device interior temperature, could realize, to the control of kiln fuel quantity, kiln speed and exhaust smoke level, meeting the requirement of producing.
The utility model provides temperature measurement system in a kind of kiln, adopt the temperature of LIF temperature survey rotary kiln inside, for solving the problem cannot carrying out measurement in real time in prior art to rotary kiln internal high temperature temperature of charge, the temperature of each reaction zone material of rotary kiln can be detected continuously.
Described temperature measurement system can carry out temperature survey to kiln interior location, and can connect computer system and carry out Real-Time Monitoring.
In kiln of the present utility model, temperature measurement system comprises: the fluoresent coating on kiln outer wall, generating laser, fluorescent acceptor, spectrometer, photomultiplier and imageing sensor (CCD), computer main control unit, wherein, generating laser is connected with computer main control unit by optical fiber; Fluorescent acceptor, spectrometer, photomultiplier and imageing sensor, computer main control unit are connected successively by optical fiber.
In kiln of the present utility model, temperature measurement system also comprises data collecting card digital-to-analogue conversion transmission system, by data collecting card digital-to-analogue conversion transmission system, the data of photomultiplier and imageing sensor is transferred to computer main control unit.
Fluoresent coating on kiln outer wall refers to rotary kiln outer wall and scribbles fluoresent coating containing butadiene high molecular polymer, this coating has more stable chemical constitution, to metal material, there is good caking property, high temperature resistant severe cold, still can keep good fluorescence excitation ability under-60-+200 degree temperature range state.
Laser emitter can be ND:YAG generating laser, and the emitting head of laser emitter adopts rotatable design, can arrange stepper motor and accurately control emission angle to control the temperature control point of the rotary kiln that will monitor.
Fluorescent acceptor can be Cassegrain telescope.Spectrometer can be monochromator.
Before this laser temperature-measuring system comes into operation, choose rotary kiln each several part location point as required, contact thermocouple is set in stove to measure temperature in furnace, object is demarcated laser temperature-measuring system, obtain the corresponding relation of surveying rotary kiln outside wall temperature and internal temperature, to obtain the internal temperature of rotary kiln in actual measurement.Wherein, signal is imported into thermometric main frame, set up thermometric main frame correction program, set up the precision that the serial of methods such as systematic features algorithm, the calculation procedure of setting and data correction formula ensure the in-furnace temperature of LIF Detection Techniques indirect inspection rotary kiln by the temperature field parameter of reality.
In kiln of the present invention, temperature measuring step comprises:
1) generating laser adopts the back wave of frequency tripling 355nm wavelength fluorescence excitation coating;
2) Cassegrain telescope (Receiver aperture 200ram) system coaxial receives the back scattering fluorescence signal of rotary kiln fluoresent coating;
3) optical signal enters monochromator and CCD through coupling fiber;
4) signal of telecommunication is converted to by photomultiplier after light splitting;
5) data collecting card digital-to-analogue conversion transmission system transfers data to computer system;
6) computer main control unit output temperature result and feedback signal.
The utility model adopts the temperature of LIF temperature survey rotary kiln inside, and principle is as follows:
Because the external temperature of rotary kiln and internal temperature have substantial connection, be therefore a good method by measuring external temperature indirect inspection internal temperature.Fluorescence is the light can launched when electronics first excited state lowest vibration energy level gets back to its electronic ground state after luminescent substance molecule absorption energy, the generation of fluorescence and the power of fluorescence intensity and the parameter such as molecular structure, change of temperature field are closely related, even if under same shooting condition, same substance molecule has different fluorescence efficiencies at different temperature.When a branch of UV light can bring out fluorescence in the fluoresent coating of a body surface, the luminous energy absorbed at different temperature is different, and the intensity of the emergent light of the wavelength length of the ratio incident light that it brings out is variant.The fluorescence efficiency of the fluorescence intensity of analytical calculation and reflection wavelength, fluoresent coating photon absorbing intensity and fluorescent material, its reflection wavelength, fluoresent coating photon absorbing intensity are linearly relevant to the variation relation of temperature.
Because laser temperature-measuring is contactless, can there is error, the factor affecting error is a lot, except the factor of instrument itself, also will consider distance coefficient, target size, response time, environmental factor etc.
Main correction formula is as follows:
(1) radiance is the physical quantity of an object relative to black body radiation capacity of water, and it is except relevant with the material shape, surface roughness, camber etc. of object, also relevant with the direction of test.If when object is smooth finish surface, its directionality is more responsive.The radiance of different material is different, and laser thermodetector receives from object the radiance that emittance size is proportional to it.
The setting of radiance
According to Kirchhoff's theorem: the hemisphere monochromatic emissivity (ε) of body surface equals its hemispherical spectral absorptivity (α), ε=α.Under thermal equilibrium condition, object radiation power equals its absorbed power, and namely absorptivity (α), reflectivity (ρ), transmissivity (γ) summation are 1, i.e. α+ρ+γ=1.For visual γ=0 of object transmissivity of opaque (or there is certain thickness), only have radiation and reflection (α+ρ=1), when the radiance of object is higher, reflectivity is less, the impact of background and reflection will be less, and the accuracy of test is also higher; Otherwise ambient temperature is higher or reflectivity is higher, larger on the impact of test.This shows, in the testing process of reality, must be noted that the radiance that different objects is corresponding with temperature measurer, will try one's best accurately, to reduce the error of measured temperature to the setting of radiance.
(2) impact of environment temperature
If the temperature of measured target is T1, when environment temperature is T2, the radiant energy of this target unit area table surface launching is
and by its institute's absorbed radiation energy be correspondingly
the net radiation energy Q that then this object sends is:
In formula, A-unit are;
The radiance of ε-object;
α-absorptivity.
If ε and α of testee is equal, simplifying above formula can obtain:
It is 270K-330K scope in environment temperature that table 1 provides the temperature measurer of sensitive wave at (9-12 μm), to the energy error (%) produced when measuring from 300K-1000K target temperature.As can be seen from table, along with the rising of environment temperature, the spurious radiation impact of generation is larger, and the error of thermometric is also larger.
Table 1 energy error is with the change curve of target temperature meter environment temperature
The beneficial effect of technical solutions of the utility model
The utility model analyzes the present situation of temperature detection in the outer rotary kiln of Present Domestic; Propose a kind of system of detection rotary kiln kiln temperature completely newly, adopt LIF thermometry; Significant and the practical value of the accurate detection of this system to rotary kiln kiln temperature.
The utility model discloses a kind of kiln temperature detection system, the temperature checking method to rotary kiln inside such as slip ring and noctovisor scan is adopted to there is enforcement complexity for solving in prior art, infrared signal is subject to high-temperature flue gas, micro mist dust concentration, influenced by solar unstable greatly, easily break down, the situations such as measure error is large, data transmission difficulty.Rotation for rotary kiln brings inconvenience to the temperature in Measurement accuracy rotary kiln body.Creative use LIF thermometry, is transferred to DCS system by digital-to-analogue conversion technology by temperature signal, meets the control overflow of technique to product reaction temperature.
The technical solution of the utility model, radium-shine emitting head adopts rotatable design, can arrange stepper motor and accurately control emission angle to control the temperature control point of the rotary kiln that will monitor.Not only can realize long-distance remote control thermometric but also save land used and mounting cost.Carry out temperature correction by certain computing formula thus the temperature of material in Measurement accuracy rotary kiln, the temperature recorded like this and rotary kiln material actual temperature closely, improve the accuracy of temperature detection.The measurement point that the different position of monitoring rotary kiln is different can be adjusted simultaneously, can monitor each temperature field of rotary kiln better.
Accompanying drawing explanation
Fig. 1 is the schematic diagram according to temperature measurement system in kiln of the present utility model.
Detailed description of the invention
Be further described according to temperature measurement system in kiln of the present utility model below in conjunction with accompanying drawing.
Fig. 1 is the schematic diagram according to temperature measurement system in kiln of the present utility model.
With reference to Fig. 1, the interior temperature measurement system of kiln 10 comprises: the fluoresent coating 1 on kiln outer wall, generating laser 2, fluorescent acceptor 3, spectrometer 5, photomultiplier and imageing sensor 6, computer main control unit 7, wherein, generating laser 2 is connected with computer main control unit 7 by optical fiber 4; Fluorescent acceptor 3, spectrometer 5, photomultiplier and imageing sensor 6, computer main control unit 7 are connected successively by optical fiber 4.
Use ND:YAG laser instrument, adopt frequency tripling 355nm wavelength to excite, repetition rate 10Hz, pulse width 4ns, single pulse exports energy range 4 ~ 90mJ.Cassegrain telescope (Receiver aperture 200ram) system coaxial receives the back scattering fluorescence signal of rotary kiln fluoresent coating, monochromator is entered through coupling fiber, the signal of telecommunication is converted to by photomultiplier after light splitting, stepping wavelength is 0.5nm. is reduce excitation light pulse energy hunting to the impact of measurement result, get 3 times on average, send PC to carry out data processing by data collecting card collection, obtain fluorescence spectrum signal.Adopt PMT gating circuit to suppress the impact of daylight in environment, veiling glare in circuit.Usually make photomultiplier be in closed condition, laser sends rear fluorescence and arrives front PMT enabling preparation reception fluorescence signal.Also apply the impact that Two-pulse triggering technology eliminates bias light in addition.PMT and data collecting card are opened in first pulse when there being fluorescence, gather containing fluorescence signal at interior light intensity signal, and second pulse, without opening PMT and data collecting card during laser, gathers background light intensity signal.Data collecting card digital-to-analogue conversion transmission system transfers data to computer system, computer main control unit output temperature result and feedback signal.
In kiln involved by the utility model, temperature measurement system may be used on Coal Chemical Industry, cement industry, ceramic industry, fluorine chemical industry etc. and uses rotary kiln device temperature survey.
Claims (7)
1. a temperature measurement system in kiln, it comprises: the fluoresent coating on kiln outer wall, generating laser, fluorescent acceptor, spectrometer, photomultiplier and imageing sensor, computer main control unit, wherein, generating laser is connected with computer main control unit by optical fiber; Fluorescent acceptor, spectrometer, photomultiplier and imageing sensor, computer main control unit are connected successively by optical fiber.
2. temperature measurement system in kiln according to claim 1, also comprises data collecting card digital-to-analogue conversion transmission system, by data collecting card digital-to-analogue conversion transmission system, the data of photomultiplier and imageing sensor is transferred to computer main control unit.
3. temperature measurement system in kiln according to claim 1, wherein, the fluoresent coating on described kiln outer wall is the fluoresent coating containing butadiene high molecular polymer.
4. temperature measurement system in kiln according to claim 1, wherein, described laser emitter is ND:YAG generating laser.
5. temperature measurement system in kiln according to claim 4, wherein, the emitting head of described laser emitter adopts rotatable design.
6. temperature measurement system in kiln according to claim 1, wherein, described fluorescent acceptor is Cassegrain telescope.
7. temperature measurement system in kiln according to claim 1, wherein, described spectrometer is monochromator.
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| CN201520822959.3U CN205119787U (en) | 2015-10-22 | 2015-10-22 | Rotary kiln furnace temperature measurement system |
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| CN201520822959.3U CN205119787U (en) | 2015-10-22 | 2015-10-22 | Rotary kiln furnace temperature measurement system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105823561A (en) * | 2016-04-28 | 2016-08-03 | 无锡昊瑜节能环保设备有限公司 | Method for measuring surface temperature of rotary kiln carcass body based on infrared |
| CN108577488A (en) * | 2018-04-23 | 2018-09-28 | 广东美的厨房电器制造有限公司 | Cooking equipment and its method for heating and controlling, control terminal and computer storage media |
| CN110307918A (en) * | 2019-06-12 | 2019-10-08 | 中国海洋大学 | Underwater scanning Raman temperature measuring equipment |
-
2015
- 2015-10-22 CN CN201520822959.3U patent/CN205119787U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105823561A (en) * | 2016-04-28 | 2016-08-03 | 无锡昊瑜节能环保设备有限公司 | Method for measuring surface temperature of rotary kiln carcass body based on infrared |
| CN108577488A (en) * | 2018-04-23 | 2018-09-28 | 广东美的厨房电器制造有限公司 | Cooking equipment and its method for heating and controlling, control terminal and computer storage media |
| CN110307918A (en) * | 2019-06-12 | 2019-10-08 | 中国海洋大学 | Underwater scanning Raman temperature measuring equipment |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 102200 Beijing City, Changping District science and Technology Park Chang Huai Lu No. 155 Patentee after: Shenwu science and technology group Limited by Share Ltd Address before: 102200 Beijing city Changping District Machi Town cow Road No. 18 Patentee before: Beijing Shenwu Environment Energy Technology Group Co., Ltd. |
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| CP03 | Change of name, title or address | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Rotary kiln furnace temperature measurement system Effective date of registration: 20180307 Granted publication date: 20160330 Pledgee: Bank of Nanjing, Limited by Share Ltd, Beijing branch Pledgor: Shenwu science and technology group Limited by Share Ltd Registration number: 2018990000177 |
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Effective date of registration: 20180724 Granted publication date: 20160330 |
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Date of cancellation: 20210724 Granted publication date: 20160330 |
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Effective date of registration: 20210724 Granted publication date: 20160330 |
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