CN103307873B - A kind of method detecting flue-gas temperature in kiln - Google Patents
A kind of method detecting flue-gas temperature in kiln Download PDFInfo
- Publication number
- CN103307873B CN103307873B CN201310259297.9A CN201310259297A CN103307873B CN 103307873 B CN103307873 B CN 103307873B CN 201310259297 A CN201310259297 A CN 201310259297A CN 103307873 B CN103307873 B CN 103307873B
- Authority
- CN
- China
- Prior art keywords
- temperature
- kiln
- flue
- furnace lining
- gas temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Muffle Furnaces And Rotary Kilns (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention provides a kind of method detecting flue-gas temperature in kiln, comprising: set up the incidence relation between flue-gas temperature in the inner wall temperature of rotary kiln to be measured and kiln; Judge whether the furnace lining of described rotary kiln to be measured changes, if furnace lining changes, then calculate obtain flue-gas temperature in described kiln according to entering the present air amount of described rotary kiln to be measured, fuel quantity and inventory; If furnace lining does not change, then utilize default thermal technology's model to calculate described inner wall temperature, and obtain flue-gas temperature in described kiln according to described incidence relation.Select the different method obtaining flue-gas temperature in kiln for the concrete operating mode of difference, obviously can improve the accuracy determining flue-gas temperature in kiln; In addition the present invention program is after normally setting up the incidence relation in inner wall temperature and kiln between flue-gas temperature, can no longer need in kiln, to insert temperature sensor as in the prior art, also not be used in kiln hood and infrared thermoviewer is set, obviously can also improve the stability and reliability that obtain flue-gas temperature in kiln.
Description
Technical field
The present invention relates to detection technique field, particularly relate to a kind of method detecting flue-gas temperature in kiln.
Background technology
Rotary kiln is a kind of cylindrical shape high temperature kiln of tilted-putted continuous rotation, for carrying out the process such as drying, roasting and calcining to material.In the production process participated in there being rotary kiln, the calcining of material is an extremely important procedure in technological process often, according to the difference of concrete technology environment and requirement, to the kiln temperature of rotary kiln and control overflow also different, if accurately kiln temperature can not be detected, just possibly effectively cannot control fuel supply and the air quantity supply of rotary kiln, cause kiln temperature axially to control uneven along rotary kiln, occur knot kiln or hot spot phenomenon.
There are following two kinds of kiln temperature detection methods in prior art:
Be a thermocouple temperature measurement method for contact, thermocouple will be inserted in kiln by the method, directly measures kiln temperature and exports, though this method can obtain the true temperature in kiln, there is following problem:
First, this mode requires very high to the material of the thermocouple inserted in kiln and protective casing and heat resistance, and can only select special thermocouple, this is obviously unfavorable for saving thermometric cost; Secondly, thermocouple directly can roll with the high-temperature material in kiln with protective casing and contact, and this causes the two to be easy to the breaking-up that is worn on the one hand, and service life is short, also makes thermocouple place be easy to tie kiln on the other hand, affects the thermometric accuracy of thermocouple; Again; unaffected in order to ensure rotary kiln intensity; can only the number of openings be reduced, existing rotary kiln in the same area generally maximum offer two for inserting the hole of thermocouple and protective casing, make this mode can not reflect temperature conditions in rotary kiln on the whole.
A kind of is contactless infrared thermal imaging temp measuring method, because infrared thermography is by temperature difference imaging, and generally in kiln the temperature difference all little, this contrast just resulting through the thermal-induced imagery that this method obtains is lower, the poor ability of resolve minutiae; In addition, infrared thermography generally can only be installed on kiln hood, in kiln, temperature detection is carried out by the form of kiln hood, therefore distance between the position that can detect and kiln hood is also very limited, for longer rotary kiln, the kiln temperature of kiln mid portion or deflection kiln portion can not be detected, cause the use of this mode to be limited to.Although exist in prior art and a kind ofly carry out model migration based on temperature of kiln head and obtain in kiln and the method for kiln end temperature, but because of in kiln hood and kiln, the temperature of kiln tail and burning feature differ greatly, therefore this model moving method cannot be applied in actual condition.
In sum, the temp measuring method in currently available technology is all difficult to ensure reliable and stable work, neither be very desirable in thermometric effect.
Summary of the invention
The embodiment of the present invention provides a kind of method detecting flue-gas temperature in kiln, realizes the object obtaining flue-gas temperature in rotary kiln accurately and reliably.
For this reason, the embodiment of the present invention provides following technical scheme:
Detect a method for flue-gas temperature in kiln, described method comprises:
Set up the incidence relation between flue-gas temperature in the inner wall temperature of rotary kiln to be measured and kiln;
Judge whether the furnace lining of described rotary kiln to be measured changes, if furnace lining changes, then calculate obtain flue-gas temperature in described kiln according to entering the present air amount of described rotary kiln to be measured, fuel quantity and inventory; If furnace lining does not change, then utilize default thermal technology's model to calculate described inner wall temperature, and obtain flue-gas temperature in described kiln according to described incidence relation.
Preferably, described rotary kiln to be measured has the temperature detection hole that at least one does not penetrate furnace lining, each temperature detection hole to a temperature detecting point should be had, then
Described set up rotary kiln to be measured inner wall temperature and kiln in incidence relation between flue-gas temperature, comprising:
Obtain the measured temperature at each temperature detecting point place, and utilize described default thermal technology's model to calculate inner wall temperature corresponding to each temperature detecting point;
Calculate obtain flue-gas temperature in kiln corresponding to each temperature detecting point according to entering the present air amount of described rotary kiln to be measured, fuel quantity and inventory;
Statistics obtains the corresponding relation in inner wall temperature corresponding to each temperature detecting point and kiln between flue-gas temperature, to set up described incidence relation.
Preferably, described set up rotary kiln to be measured inner wall temperature and kiln in incidence relation between flue-gas temperature, also comprise:
Detector unit is utilized to measure flue-gas temperature in actual kiln corresponding to each temperature detecting point;
Judge in actual kiln that in the kiln that calculating corresponding to each temperature detecting point obtains, flue-gas temperature and measurement obtain, whether flue-gas temperature conforms to, if do not conformed to, then corrected Calculation obtains the algorithm of flue-gas temperature in described kiln.
Preferably, described detector unit is temperature sensor and/or infrared thermography.
Preferably, if described temperature detecting point is at the kiln shell place of described rotary kiln to be measured, then
Obtain the measured temperature at described test point place, comprising: heat bottom hole is passed to described temperature detecting point, and obtains the measured temperature at described test point place by temperature measuring equipment collection by the heat conducting element inserted in temperature detection hole;
Described default thermal technology's model is:
Wherein, T
1for inner wall temperature, T
2for the measured temperature at temperature detecting point place, T
3for environment temperature, S is heat conducting element and furnace lining contact point heat waste, and ω is ambient wind velocity, and ε is heat conducting element blackness, F
0for inserting the diameter of the heat conducting element in temperature detection hole, F is the diameter of the heat conducting element at temperature detecting point place, δ
1for the thickness of the non-penetrating component of furnace lining, λ
1for the thermal conductivity of furnace lining, δ
2for the length of heat conducting element, λ
2for the thermal conductivity of heat conducting element.
Preferably, described heat conducting element is solid heat conductive rod.
Preferably, the thickness δ of the non-penetrating component of described furnace lining
1=50mm ~ 150mm.
Preferably, if described temperature detecting point is in the bottom in described temperature detection hole, then
Obtain the measured temperature at described test point place, comprising: the temperature sensor collection of inserting in temperature detection hole obtains the measured temperature at described test point place;
Described default thermal technology's model is:
Wherein, T
1for inner wall temperature, T
2for the measured temperature at temperature detecting point place, q is the heat flow density of temperature detecting point, δ
1for the thickness of the non-penetrating component of furnace lining, λ
1for the thermal conductivity of furnace lining.
Preferably, described temperature sensor is thermocouple, thermal resistance, infrared thermometer or land surface pyrometer.
Preferably, the thickness δ of the non-penetrating component of described furnace lining
1=50mm ~ 150mm.
The embodiment of the present invention detects the method for flue-gas temperature in kiln, whether change according to the furnace lining of rotary kiln and provide the method for flue-gas temperature in two kinds of acquisition kilns: if furnace lining changes, then utilize air capacity, fuel quantity and the inventory entering rotary kiln to calculate and obtain flue-gas temperature in theoretical kiln; If furnace lining does not change, then thermal technology's model first can be utilized to obtain inner wall temperature, and then obtain flue-gas temperature in kiln by the incidence relation in inner wall temperature and kiln between flue-gas temperature again.Select the different method obtaining flue-gas temperature in kiln for the concrete operating mode of difference, obviously can improve the accuracy determining flue-gas temperature in kiln; In addition the present invention program is after normally setting up the incidence relation in inner wall temperature and kiln between flue-gas temperature, no longer can need the temperature sensor inserting such as thermocouple as in the prior art in kiln, also not be used in kiln hood and infrared thermoviewer is set, obviously can also improve stability and reliability that the present invention program obtains flue-gas temperature in kiln.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, for those of ordinary skill in the art, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is that the one of temp measuring system in the embodiment of the present invention forms schematic diagram;
Fig. 2 is that the another kind of temp measuring system in the embodiment of the present invention forms schematic diagram;
Fig. 3 is the flow chart that the embodiment of the present invention detects the method for flue-gas temperature in kiln;
Fig. 4 is the flow chart of relationship embodiment 1 of being associated in the embodiment of the present invention;
Fig. 5 is the generalized section in the embodiment of the present invention behind a kind of heat conducting element insertion temperature detection hole;
Fig. 6 is the generalized section in the embodiment of the present invention behind another kind of heat conducting element insertion temperature detection hole;
Fig. 7 is the generalized section in the embodiment of the present invention behind temperature sensor insertion temperature detection hole;
Fig. 8 is the flow chart of relationship embodiment 2 of being associated in the embodiment of the present invention.
Detailed description of the invention
In order to make those skilled in the art person understand the present invention program better, below in conjunction with drawings and embodiments, the embodiment of the present invention is described in further detail.
First composition graphs 1,2 simply introduces the formation of lower rotary kiln below, shown in figure is the circumferential cross sectional representation of rotary kiln, direction of arrow running to be pressed in figure by rotary kiln, from the furnace lining 12 that can comprise the kiln shell 11 of steel outside to inside, refractory material is formed, the inwall 13 directly contacted with material, for holding the kiln internal cavity 14 of material.In order to ensure the normal operation of calcine technology and rotary kiln, the temperature of kiln inside should by monitor and forecast at any time, but the rotating operation of rotary kiln brings great difficulty but to the measurement of the temperature of kiln inside, therefore the temperature survey of kiln inside is all a difficult problem all the time.
It should be noted that, in the use procedure of rotary kiln, the medium in kiln internal cavity mainly contains pellet and flue gas, from the angle obtaining flue-gas temperature in kiln, can be reflected the temperature of kiln inside by flue-gas temperature.Generally, flue gas can comprise and enters into gas that in the coal dust of kiln internal cavity or gaseous fuel, the air being blown into kiln internal cavity by air blast, kiln, material chemical reaction produces etc. by burner.
Although there is the method that some detect flue-gas temperature in kiln in prior art, but not very desirable in Detection results, service life, testing cost etc., the present invention program proposes to accurately and reliably detect flue-gas temperature in kiln, below introduce in detail lower implementation of the present invention.
See Fig. 3, show the flow chart that the embodiment of the present invention detects the method for flue-gas temperature in kiln, described method comprises:
Step 101, sets up the incidence relation between flue-gas temperature in the inner wall temperature of rotary kiln to be measured and kiln;
Step 102, judges whether the furnace lining of described rotary kiln to be measured changes, if furnace lining changes, then calculates obtain flue-gas temperature in described kiln according to entering the air capacity of described rotary kiln to be measured, fuel quantity and inventory; If furnace lining does not change, then utilize default thermal technology's model to calculate described inner wall temperature, and obtain flue-gas temperature in described kiln according to described incidence relation.
Whether the embodiment of the present invention changes according to furnace lining provides the implementation of flue-gas temperature in two kinds of acquisition kilns, conveniently understands, below we are first simple introduces lower furnace lining change.Furnace lining change major embodiment is that knot kiln and furnace lining come off two kinds:
In the long-term production process of rotary kiln, the powder come off from pelletizing surface and low melting point are easy to stick to the furnace lining inner surface of rotary kiln under the high temperature conditions, form circle bonding material (i.e. ring formation thing), we call knot kiln this phenomenon.That is, when there is not knot kiln phenomenon, rotary kiln inwall is furnace lining inner surface; And if there is knot kiln phenomenon, rotary kiln inwall will become the inner surface of ring formation thing from original furnace lining inner surface, namely tie kiln and increase distance between kiln internal cavity to kiln shell.
In addition, if there is knot kiln phenomenon in rotary kiln, then after long time integration, ring formation thing can be more and more thicker, the gravity load in rotary kiln is just made to increase, furnace lining may be peeled off from drawing crack kiln shell time serious under the effect of ring formation thing, also namely ring formation thing destroys the connection between furnace lining and kiln shell, this phenomenon, we call that furnace lining peels off.
No matter be knot kiln or furnace lining peels off, furnace lining changes just may change gravity load in kiln, and then rotary kiln center of gravity is offset, and affects the normal operation of rotary kiln.
If furnace lining does not change, we are in desired operation state by visual rotary kiln, have certain incidence relation between rotary kiln temperature everywhere, therefore calculate flue-gas temperature in the kiln that obtains and be difficult to measure by this incidence relation.As the present invention program sets up the incidence relation in inner wall temperature and kiln between flue-gas temperature, so just can be when needed, utilize this incidence relation and known inner wall temperature to calculate and obtain flue-gas temperature in kiln, that is, after setting up above-mentioned incidence relation, as long as get inner wall temperature can obtain flue-gas temperature in kiln.Wouldn't describe in detail for the mode obtaining inner wall temperature herein.
If furnace lining changes, then may affect the incidence relation of rotary kiln everywhere between temperature, so in time, adopts incidence relation to calculate flue-gas temperature in kiln just may to there is certain deviation again, corresponding this situation, the present invention also considers directly to affect some heat factors of flue-gas temperature in kiln, that is can calculate flue-gas temperature in kiln according to these factors and each factor proportion.The heat factor affecting flue-gas temperature in kiln can comprise: heat (consumption of calorie) that consumption of chemical reaction occurs etc. between the heat (consumption of calorie) absorbed in the heat (consumption of calorie) that the heat (release heat) that kiln fuel combustion produces, rotary kiln outwards distribute, material calcining process, material, from the angle of heat balance, the heat that the heat that burning discharges deducts consumption should be just the heat determining flue-gas temperature in kiln.Comprehensive above-mentioned several heat factor is known, the factor of flue-gas temperature in kiln that affects mainly contains the air capacity, fuel quantity, the inventory that finally enter rotary kiln, the heat of theoretical release and the theoretical heat consumed just can be determined according to the proportion relation of this three aspect factor, and then can according to flue-gas temperature in Heat balance calculation kiln discharge.
It should be noted that, above-mentionedly utilize in the scheme of flue-gas temperature in heat Balance Calculation kiln, determine the proportion relation of air capacity, fuel quantity, inventory three, and after utilizing the theoretical value of flue-gas temperature in its calculating kiln discharge, in order to ensure to calculate accuracy, also revise the proportion relation between three factors by the mode of theoretical value compared with measured value, make the final theoretical value calculated closer to measured value, more meet rotary kiln actual conditions.
The thermocouple temperature measurement method of contact of the prior art and/or contactless infrared thermal imaging temp measuring method can be utilized to obtain measured value, such as, by flue-gas temperature in the kiln at infrared thermoviewer acquisition kiln hood position, flue-gas temperature in the kiln of being partial to kiln tail bit in kiln is obtained by thermocouple, the mode of the present invention to the measured value obtaining flue-gas temperature in kiln can not limit, as long as can obtain measured value corresponding to each theoretical value when needed.
To introduce in lower the present invention the process of establishing of incidence relation between flue-gas temperature in inner wall temperature and kiln below.
Rotary kiln is provided with multiple temperature detecting point, in the inner wall temperature corresponding by each temperature detecting point of statistical summaries and kiln, the mode of flue-gas temperature sets up above-mentioned incidence relation, see Fig. 4, show in the embodiment of the present invention flow chart of the relationship embodiment 1 that is associated, comprising:
Step 201, obtains the measured temperature at each temperature detecting point place, and utilizes described default thermal technology's model to calculate inner wall temperature corresponding to each temperature detecting point;
Step 202, calculates obtain flue-gas temperature in kiln corresponding to each temperature detecting point according to entering the air capacity of described rotary kiln to be measured, fuel quantity and inventory;
Step 203, statistics obtains the corresponding relation in inner wall temperature corresponding to each temperature detecting point and kiln between flue-gas temperature, to set up described incidence relation.
It should be noted that, step 201,202 execution sequence can not affect the incidence relation that the present invention finally determines, that is order shown in Fig. 4 can be adopted first to obtain inner wall temperature to reentry flue-gas temperature in kiln, also first can obtain flue-gas temperature in kiln to reentry inner wall temperature, or also can obtain these two temperature, the present invention does not limit this simultaneously.
From introducing, in the process of the relation that is associated, relate generally to following two aspect temperature datas above:
1. flue-gas temperature in the kiln that each temperature detecting point is corresponding
In kiln, flue-gas temperature can adopt the method introduced to obtain above, namely between known air amount, fuel quantity, inventory and three proportion prerequisite under, obtain flue-gas temperature in kiln by Heat balance calculation, repeat no more herein.
2. the inner wall temperature that each temperature detecting point is corresponding
Inner wall temperature is the same with flue-gas temperature in kiln to be one and to detect a difficult problem, for this reason, we do not adopt the mode directly measured to obtain, but set up inner wall temperature and outside and can the mode of thermal technology's model between collecting temperature indirectly obtain, corresponding to this, the invention provides following can implementation:
Scheme one
Directly utilize temperature measurer to detect the temperature of kiln shell outer surface, namely temperature detecting point is positioned on kiln shell.Inwall has individual thermograde on test point direction, this thermograde determines primarily of furnace lining thermal conductivity, that is, according to furnace lining thermal conductivity, we can calculate the thermal technology's model obtained between inner wall temperature and kiln shell test point temperature, and then after the measured temperature detecting the test point be positioned on kiln shell, thermal technology's model can be utilized to calculate and obtain inner wall temperature.
To this, in prior art, there are following two kinds of modes: Portable Multifunctional Temperature Measurer manual scanning thermometric can be passed through, also by cylindrical shell scanner automatic scan thermometric by Field Force.
Scheme two
Temp measuring system shown in Fig. 1 can be utilized to detect the measured temperature obtaining temperature detecting point place, the program can offer at the kiln of rotary kiln the temperature detection hole 20 that at least one does not penetrate furnace lining with it, each temperature detection hole has a temperature detecting point, and in this programme, temperature detecting point is positioned at kiln shell place.
In temperature taking process, heat conducting element 41 is inserted in temperature detection hole, by heat conducting element, heat bottom hole is conducted to kiln shell place, and then gather acquisition measured temperature by temperature measuring equipment 30.In this programme, the object offering temperature detection hole is to make measured temperature closer to inner wall temperature, and making furnace lining retain the object that do not penetrate of preset thickness is the problem such as short and easy knot kiln in service life in order to prevent from heat conducting element from directly contacting with material in kiln causing.Generally, the preset thickness bottom hole and between inwall can be δ
1=50mm ~ 150mm.
Fig. 5 shows the generalized section behind a kind of heat conducting element insertion temperature detection hole, wherein, the inner of heat conducting element and the hole bottom connection in temperature detection hole touch, the outer end of heat conducting element is positioned at kiln shell outer surface, bottom hole, heat is delivered to outer end by heat conducting element from the inner, as in the case, temperature detecting point is specifically positioned on kiln shell.Compared with scheme one, though temperature detecting point is all positioned on kiln shell, but this programme measures the temperature value of acquisition closer to inwall true temperature.
Fig. 6 shows the generalized section behind another kind of heat conducting element insertion temperature detection hole, wherein, the inner of heat conducting element and the hole bottom connection in temperature detection hole touch, the outer end of heat conducting element then extends to outside kiln shell outer surface, similarly, bottom hole, heat can be delivered to by heat conducting element the outer end extending to kiln shell outside from the inner, and as in the case, temperature detecting point is specifically positioned at the outside of kiln shell.
Known see situation shown in Fig. 5,6, temperature measuring equipment collection be all the temperature of heat conducting element outer end, that is the actual outer face referring to heat conducting element of temperature detecting point, conveniently temperature measuring equipment Obtaining Accurate derives the heat temperature of reacting to heat conducting element, heat conducting element can be divided into two parts: a part is inserted in temperature detection hole, in order to ensure rotary kiln intensity, and avoid heat conducting element in kiln, be guided out too much heat causing unnecessary heat waste, the diameter F of this part
0=20mm ~ 30mm; A part is positioned at kiln shell place (can be presented as kiln shell outer surface or extend to kiln shell outside), in order to ensure that temperature measuring equipment detects the temperature of heat conducting element outer end fast and accurately, the diameter of this part can be slightly larger, and concrete span can be F=25mm ~ 40mm.
In order to simplify the process setting up thermal technology's model, the present invention, mainly for the unconverted situation of rotary kiln furnace lining, does following setting when also reaching steady-state heat balance to system simultaneously: rotary kiln and ambient air are perpendicular contact heat exchange; Rotary kiln external environment condition wind speed is stablized; Rotary kiln internal heat resource stable heating, ripple disable or fluctuation less; Furnace lining internal porosity is evenly distributed, and thermal resistance is consistent; Heat conducting element the inner imports heat, dispels the heat in outer end, and middle without heat loss.
Described default thermal technology's model is:
Wherein, T
1for inner wall temperature (unit is K), T
2for the measured temperature (unit is K) at temperature detecting point place, T
3for environment temperature (unit is K), S is heat conducting element and furnace lining contact point heat waste (can obtaining by accumulation previous experiences, as can be taken as 0.95), and ω is ambient wind velocity (unit is m/s), and ε is heat conducting element blackness, F
0in order to insert the diameter of the heat conducting element in temperature detection hole, (unit is m), and F is that (unit is m), δ for the diameter of the heat conducting element at temperature detecting point place
1for the thickness of the non-penetrating component of furnace lining, (unit is m), λ
1for the thermal conductivity (unit is W/ (m*K)) of furnace lining, δ
2for the length of heat conducting element, λ
2for the thermal conductivity (unit is W/ (m*K)) of heat conducting element.
Like this, after temperature measuring equipment detects the measured temperature of heat conducting element outer face, above-mentioned thermal technology's model can be utilized to calculate and to obtain inner wall temperature corresponding to this temperature detecting point.
Finally, also it should be noted that, as a kind of preferred embodiment of temp measuring system shown in Fig. 1, heat conducting element preferably makes the pure solid heat conductive rod of material, when preventing other material from participating in (air as in hollow heat conductive rod), affect the heat transfer effect of heat conductive rod because of the thermal conductivity factor difference of material.In addition, consider that the thermal conductivity factor of the material making heat conducting element should be tried one's best greatly, thermal coefficient of expansion little as far as possible, fusing point should should try one's best under high, high temperature and prevent the factors such as oxidized, any one preferably adopting in the material such as carbon, carborundum, copper chromium plating, stainless steel makes heat conducting element.
Scheme three
Temp measuring system shown in Fig. 2 can be utilized to detect the measured temperature obtaining temperature detecting point place, the program can offer at the kiln of rotary kiln the temperature detection hole that at least one does not penetrate furnace lining with it, each temperature detection hole is to there being a temperature detecting point, and in this programme, temperature detecting point is positioned at the bottom in temperature detection hole.
In temperature taking process, temperature sensor 42 is inserted in temperature detection hole, gather hole bottom temp by temperature sensor, and by compensating wire 52, temperature signal is gathered in transmitter 51, after temperature signal being converted to the signal of telecommunication by transmitter, radio to control centre 53.Similarly, the object offering temperature detection hole in this programme be measured temperature in order to make temperature sensor collect closer to inner wall temperature, furnace lining is retained object that preset thickness do not penetrate is the problem such as short and easy knot kiln in the service life in order to prevent from temperature sensor from directly contacting with material in kiln causing.Generally, the preset thickness bottom hole and between inwall can be δ
1=50mm ~ 150mm.
Fig. 7 shows the generalized section behind temperature sensor insertion temperature detection hole, wherein, after temperature sensor inserts temperature detection hole, the working end (or being called measuring junction) of direct measuring tempeature should as far as possible with hole bottom close contact, hole bottom temp is gathered by it, make the temperature of collection as far as possible close to the true temperature of inwall, that is temperature detecting point specifically refer to temperature detection hole hole bottom (specifically referring to bottom hole be positioned at furnace lining and one end of close inwall).
In order to simplify the process setting up thermal technology's model, the present invention, mainly for the unconverted situation of rotary kiln furnace lining, does following setting when also reaching steady-state heat balance to system simultaneously: rotary kiln internal heat resource stable heating, ripple disable or fluctuation less; Furnace lining internal porosity is evenly distributed, and thermal resistance is consistent.
Described default thermal technology's model is:
Wherein, T
1for inner wall temperature (unit is K), T
2for the measured temperature (unit is K) at temperature detecting point place, q is that (in fact the heat flow density difference on periphery kiln surface, temperature detection hole is all little, and detect by heat current densimeter and obtain, unit is W/m for the heat flow density of temperature detecting point
2), δ
1for the thickness of the non-penetrating component of furnace lining, (unit is m), λ
1for the thermal conductivity (unit is W/ (m*K)) of furnace lining.
Like this, after the measured temperature bottom the hole that temperature sensor detects temperature detection hole, above-mentioned thermal technology's model can be utilized to calculate and to obtain inner wall temperature corresponding to this temperature detecting point.
Finally, also it should be noted that, as a kind of preferred embodiment of temp measuring system shown in Fig. 2, temperature sensor can be presented as thermocouple, thermal resistance, infrared thermometer or land surface pyrometer.
After the temperature data obtaining flue-gas temperature and inner wall temperature these two aspects in kiln corresponding to temperature detecting point, incidence relation therebetween can be set up: as, rotary kiln has i temperature detecting point, and in kiln corresponding to each temperature detecting point, flue-gas temperature is T
0i, inner wall temperature is T
1i, then T
0iwith T
1ibetween incidence relation can be presented as T
1i=β T
0i+ b, wherein β is temperature varying coefficient, and b is constant, can obtain β and b through mass data statistics.
See Fig. 8, show in the embodiment of the present invention flow chart of the relationship embodiment 2 that is associated, comprising:
Step 301, obtains the measured temperature at each temperature detecting point place, and utilizes described default thermal technology's model to calculate inner wall temperature corresponding to each temperature detecting point;
Step 302, calculates obtain flue-gas temperature in kiln corresponding to each temperature detecting point according to entering the air capacity of described rotary kiln to be measured, fuel quantity and inventory;
Step 303, utilizes detector unit to measure flue-gas temperature in actual kiln corresponding to each temperature detecting point;
Step 304, judge in actual kiln that in the kiln that calculating corresponding to each temperature detecting point obtains, flue-gas temperature and measurement obtain, whether flue-gas temperature conforms to, if do not conformed to, then perform the algorithm that step 305 corrected Calculation obtains flue-gas temperature in described kiln, and then perform step 306; If conformed to, then directly perform step 306;
Step 306, statistics obtains the corresponding relation in inner wall temperature corresponding to each temperature detecting point and kiln between flue-gas temperature, to set up described incidence relation.
Compared with embodiment illustrated in fig. 41, also set up in the present embodiment with actual measurement to kiln in the correction of flue-gas temperature value utilize air capacity, fuel quantity, inventory to calculate the step of the algorithm of flue-gas temperature value in theoretical kiln, ensure the correctness of theoretical algorithm as far as possible, make calculated value closer to measured value.
Can be presented as temperature sensor and/or infrared thermography for detecting the detector unit obtaining flue-gas temperature in actual kiln, still have i temperature detecting point for rotary kiln, in the actual kiln that each temperature detecting point is corresponding, flue-gas temperature is T
2i, the T that more each temperature detecting point is corresponding respectively
0iwith T
2ibetween whether conform to, if conformed to, then think calculate obtain T
0ialgorithm be accurately; If do not conformed to, then according to the error transfer factor algorithm of the two (specifically referring to the correction factor that adjustment utilizes air capacity, fuel quantity, inventory three carries out theory calculate), T should be obtained to ensure to calculate
0ithe reliability of algorithm and accuracy.It should be noted that, conforming in the present invention can be T
0iwith T
2ibetween there is certain tolerance, also can be strict equal, can determine according to actual service condition this, the present invention can not limit.
It should be noted that, set up inner wall temperature and outside can thermal technology's model between collecting temperature (i.e. the measured temperature at temperature detecting point place) time, premised on furnace lining does not change, if this is mainly because furnace lining changes and will affect the accuracy of thermal technology's model.Such as, if there is knot kiln phenomenon, then also will consider thermal conductivity and the ring formation thickness of ring formation thing when setting up thermal technology's model, and ring formation thickness is a unknown number, therefore accurately can not draw the thermal technology's model in this situation.Similarly, if there is furnace lining peeling phenomenon, then will consider the thickness of the furnace lining peeled off, this thickness is also a unknown number, therefore can not draw the thermal technology's model in this situation accurately.
In addition, when setting up the incidence relation in inner wall temperature and kiln between flue-gas temperature, then without the need to considering whether furnace lining changes, this is mainly because whether the inner wall position in the present invention can change along with furnace lining and change.That is, if furnace lining does not change, then inwall refers to furnace lining inner surface; If there is knot kiln phenomenon, then inwall refers to ring formation thing inner surface; If there is furnace lining peeling phenomenon, then inwall refers to the furnace lining inner surface that the backward kiln shell direction of peeling off is sunken.It can thus be appreciated that whether furnace lining changes the incidence relation that can not affect in inner wall temperature and kiln between flue-gas temperature.
The present invention program is at the initial stage of setting up incidence relation between flue-gas temperature in inner wall temperature and kiln, temperature sensor (as thermocouple), infrared thermography can be used, but once after successfully setting up above-mentioned incidence relation, then no longer need these or be inserted in kiln or be arranged on the detector unit of kiln hood, this just can solve short, the shortcoming such as job insecurity, thermometric effect are undesirable in temp measuring method of the prior art service life.
Particularly, when flue-gas temperature in acquisition kiln measured by needs,
First, judge whether rotary kiln furnace lining changes, temp measuring system shown in Fig. 1,2 can be utilized to realize this, determination methods can be presented as: detect by heat conducting element or temperature sensor the temperature that rotary kiln difference examines temperature point place at the rotary kiln initial stage of coming into operation, and using these temperature as normal temperature; Then in the follow-up use procedure of rotary kiln, also constantly can detect the temperature at each test point place, and by these temperature compared with above-mentioned normal temperature, if matched with normal temperature, then think that rotary kiln works well; If do not mated with normal temperature, and be lower than normal temperature, then think that knot kiln phenomenon appears in this test point place; If do not mated with normal temperature, and be higher than normal temperature, then think that furnace lining peeling phenomenon appears in this test point place.Certainly, the mode of above-mentioned direct-detection kiln shell temperature also can be used for judging whether rotary kiln furnace lining changes, its deterministic process and said process similar, repeat no more herein.
Secondly, if judge, furnace lining changes, obvious this situation has not been suitable for thermal technology's model, therefore measured temperature can not be utilized directly to obtain inner wall temperature, and can not get inner wall temperature incidence relation also just can not be utilized to obtain flue-gas temperature in kiln, so time to calculate by the theoretical algorithm that accuracy is higher and obtain flue-gas temperature in kiln.If judge, furnace lining does not change, then illustrate that present case is applicable to thermal technology's model, therefore can thermal technology's model be utilized to calculate inner wall temperature after the measured temperature obtaining test point place, and then utilizes incidence relation to obtain flue-gas temperature in corresponding kiln.
Similarly, the incidence relation in the present invention also can be used for obtaining inner wall temperature, when acquisition inner wall temperature measured by needs,
First, judge whether rotary kiln furnace lining changes, the mode of temp measuring system shown in Fig. 1,2 or direct-detection kiln shell temperature still can be utilized to realize, repeat no more herein.
Secondly, if judge, furnace lining changes, and obvious this situation has not been suitable for thermal technology's model, so Shi Kexian is calculated by the theoretical algorithm that accuracy is higher obtain flue-gas temperature in kiln, and then recycling incidence relation obtains corresponding inner wall temperature.If judge, furnace lining does not change, then illustrate that present case is applicable to thermal technology's model, therefore can after the measured temperature obtaining test point place, utilize thermal technology's model to obtain inner wall temperature.
The present invention program can describe in the general context of computer executable instructions, such as program unit.Usually, program unit comprises the routine, program, object, assembly, data structure etc. that perform particular task or realize particular abstract data type.Also can put into practice the present invention program in a distributed computing environment, in these DCEs, be executed the task by the remote processing devices be connected by communication network.In a distributed computing environment, program unit can be arranged in the local and remote computer-readable storage medium comprising memory device.
Each embodiment in this description all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiment.Especially, for device embodiment, because it is substantially similar to embodiment of the method, so describe fairly simple, relevant part illustrates see the part of embodiment of the method.Device embodiment described above is only schematic, the wherein said unit illustrated as separating component or can may not be and physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed on multiple NE.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
Being described in detail the embodiment of the present invention above, applying detailed description of the invention herein to invention has been elaboration, the explanation of above embodiment just understands method and apparatus of the present invention for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. detect a method for flue-gas temperature in kiln, it is characterized in that, described method comprises:
Set up the incidence relation between flue-gas temperature in the inner wall temperature of rotary kiln to be measured and kiln;
Judge whether the furnace lining of described rotary kiln to be measured changes, if furnace lining changes, then calculate obtain flue-gas temperature in described kiln according to entering the present air amount of described rotary kiln to be measured, fuel quantity and inventory; If furnace lining does not change, then utilize default thermal technology's model to calculate described inner wall temperature, and obtain flue-gas temperature in described kiln according to described incidence relation;
Wherein, described default thermal technology's model is rotary kiln when reaching steady-state heat balance, and inner wall temperature and outside can thermal technology's models between collecting temperature.
2. method according to claim 1, is characterized in that, described rotary kiln to be measured has the temperature detection hole that at least one does not penetrate furnace lining, each temperature detection hole to a temperature detecting point should be had, then
Described set up rotary kiln to be measured inner wall temperature and kiln in incidence relation between flue-gas temperature, comprising:
Obtain the measured temperature at each temperature detecting point place, and utilize described default thermal technology's model to calculate inner wall temperature corresponding to each temperature detecting point;
Calculate obtain flue-gas temperature in kiln corresponding to each temperature detecting point according to entering the present air amount of described rotary kiln to be measured, fuel quantity and inventory;
Statistics obtains the corresponding relation in inner wall temperature corresponding to each temperature detecting point and kiln between flue-gas temperature, to set up described incidence relation.
3. method according to claim 2, is characterized in that, described set up rotary kiln to be measured inner wall temperature and kiln in incidence relation between flue-gas temperature, also comprise:
Detector unit is utilized to measure flue-gas temperature in actual kiln corresponding to each temperature detecting point;
Judge in actual kiln that in the kiln that calculating corresponding to each temperature detecting point obtains, flue-gas temperature and measurement obtain, whether flue-gas temperature conforms to, if do not conformed to, then corrected Calculation obtains the algorithm of flue-gas temperature in described kiln.
4. method according to claim 3, is characterized in that, described detector unit is temperature sensor and/or infrared thermography.
5. the method according to any one of claim 2 to 4, is characterized in that, if described temperature detecting point is at the kiln shell place of described rotary kiln to be measured, then
Obtain the measured temperature at described test point place, comprising: heat bottom hole is passed to described temperature detecting point, and obtains the measured temperature at described test point place by temperature measuring equipment collection by the heat conducting element inserted in temperature detection hole;
Described default thermal technology's model is:
Wherein, T
1for inner wall temperature, T
2for the measured temperature at temperature detecting point place, T
3for environment temperature, S is heat conducting element and furnace lining contact point heat waste, and ω is ambient wind velocity, and ε is heat conducting element blackness, F
0for inserting the diameter of the heat conducting element in temperature detection hole, F is the diameter of the heat conducting element at temperature detecting point place, δ
1for the thickness of the non-penetrating component of furnace lining, λ
1for the thermal conductivity of furnace lining, δ
2for the length of heat conducting element, λ
2for the thermal conductivity of heat conducting element;
Described steady-state heat balance is: rotary kiln and ambient air are perpendicular contact heat exchange; Rotary kiln external environment condition wind speed is stablized; Rotary kiln internal heat resource stable heating, ripple disable or fluctuation less; Furnace lining internal porosity is evenly distributed, and thermal resistance is consistent; Heat conducting element the inner imports heat, dispels the heat in outer end, and middle without heat loss.
6. method according to claim 5, is characterized in that, described heat conducting element is solid heat conductive rod.
7. method according to claim 5, is characterized in that, the thickness δ of the non-penetrating component of described furnace lining
1=50mm ~ 150mm.
8. the method according to any one of claim 2 to 4, is characterized in that, if described temperature detecting point is in the bottom in described temperature detection hole, then
Obtain the measured temperature at described test point place, comprising: the temperature sensor collection of inserting in temperature detection hole obtains the measured temperature at described test point place;
Described default thermal technology's model is:
Wherein, T
1for inner wall temperature, T
2for the measured temperature at temperature detecting point place, q is the heat flow density of temperature detecting point, δ
1for the thickness of the non-penetrating component of furnace lining, λ
1for the thermal conductivity of furnace lining;
Described steady-state heat balance is: rotary kiln internal heat resource stable heating, ripple disable or fluctuation less; Furnace lining internal porosity is evenly distributed, and thermal resistance is consistent.
9. method according to claim 8, is characterized in that, described temperature sensor is thermocouple, thermal resistance, infrared thermometer or land surface pyrometer.
10. method according to claim 8, is characterized in that, the thickness δ of the non-penetrating component of described furnace lining
1=50mm ~ 150mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310259297.9A CN103307873B (en) | 2013-06-26 | 2013-06-26 | A kind of method detecting flue-gas temperature in kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310259297.9A CN103307873B (en) | 2013-06-26 | 2013-06-26 | A kind of method detecting flue-gas temperature in kiln |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103307873A CN103307873A (en) | 2013-09-18 |
| CN103307873B true CN103307873B (en) | 2015-07-29 |
Family
ID=49133374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310259297.9A Active CN103307873B (en) | 2013-06-26 | 2013-06-26 | A kind of method detecting flue-gas temperature in kiln |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103307873B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568187B (en) * | 2014-12-31 | 2017-07-25 | 中冶长天国际工程有限责任公司 | A kind of kiln temperature detection method and device |
| CN104833206B (en) * | 2015-05-08 | 2016-10-05 | 中冶长天国际工程有限责任公司 | A kind of dead-weight rotary kiln direct temperature measurement device |
| CN110360353A (en) * | 2019-08-12 | 2019-10-22 | 纪呈孟 | A kind of fireproof check valve of draught flue |
| CN112146774A (en) * | 2020-09-24 | 2020-12-29 | 广东电科院能源技术有限责任公司 | Method and system for measuring temperature of hearth in waste incineration power plant |
| CN112301213B (en) * | 2020-11-03 | 2021-11-26 | 内蒙古景蕾实业有限公司 | Manganese ore roasting rotary kiln system |
| CN113155072B (en) * | 2021-02-09 | 2023-01-17 | 鞍钢股份有限公司 | On-line detection method for thickness of ring forming material of pellet rotary kiln |
| CN113899203B (en) * | 2021-10-11 | 2024-03-22 | 郑州大学 | Method for monitoring thickness change of kiln lining refractory material of rotary kiln |
| CN117906376B (en) * | 2024-03-18 | 2024-05-24 | 泰安中联水泥有限公司 | Method and system for monitoring carbon emission of rotary kiln |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3691840A (en) * | 1970-01-22 | 1972-09-19 | Jacques Dufour | Temperature-measuring device |
| CN1076781A (en) * | 1992-03-24 | 1993-09-29 | 西安交通大学 | Compensation high temperature gas flow thermometry and measuring instrument |
| JP2001004283A (en) * | 1999-06-23 | 2001-01-12 | Sumitomo Heavy Ind Ltd | Monitor method for rotary kiln |
| CN101464093A (en) * | 2007-12-19 | 2009-06-24 | 贵阳铝镁设计研究院 | Temperature field detection method and device of calcination rotary kiln |
| CN101749942A (en) * | 2008-12-09 | 2010-06-23 | 沈阳铝镁设计研究院 | Temperature measuring device of rotary kiln |
| WO2011000430A1 (en) * | 2009-07-03 | 2011-01-06 | Abb Ab | Method and device for controlling a process for burning a lime containing mixture to burnt lime |
| CN102809283A (en) * | 2012-09-14 | 2012-12-05 | 中南大学 | Method for determining material temperature field in rotary kiln |
-
2013
- 2013-06-26 CN CN201310259297.9A patent/CN103307873B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3691840A (en) * | 1970-01-22 | 1972-09-19 | Jacques Dufour | Temperature-measuring device |
| CN1076781A (en) * | 1992-03-24 | 1993-09-29 | 西安交通大学 | Compensation high temperature gas flow thermometry and measuring instrument |
| JP2001004283A (en) * | 1999-06-23 | 2001-01-12 | Sumitomo Heavy Ind Ltd | Monitor method for rotary kiln |
| CN101464093A (en) * | 2007-12-19 | 2009-06-24 | 贵阳铝镁设计研究院 | Temperature field detection method and device of calcination rotary kiln |
| CN101749942A (en) * | 2008-12-09 | 2010-06-23 | 沈阳铝镁设计研究院 | Temperature measuring device of rotary kiln |
| WO2011000430A1 (en) * | 2009-07-03 | 2011-01-06 | Abb Ab | Method and device for controlling a process for burning a lime containing mixture to burnt lime |
| CN102809283A (en) * | 2012-09-14 | 2012-12-05 | 中南大学 | Method for determining material temperature field in rotary kiln |
Non-Patent Citations (2)
| Title |
|---|
| 中空回转窑的传热量、窑型模数和预热设备匹配问题;孙义燊;《硅酸盐学报》;19810826(第04期);全文 * |
| 回转窑直接还原热过程数模研究;刘武等;《东北大学学报(自然科学版)》;19850215(第01期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103307873A (en) | 2013-09-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103307873B (en) | A kind of method detecting flue-gas temperature in kiln | |
| CN103966377B (en) | Blast furnace temperature on-line checkingi acquisition system and online test method | |
| CN110186583B (en) | Method for measuring temperature of ceramic matrix composite high-temperature component based on electrical impedance imaging | |
| CN108132112A (en) | A kind of hypersonic aircraft surface heat flux device and design method | |
| CN103308211B (en) | Temperature measurement system | |
| CN104198524A (en) | System and method for measuring equivalent heat conductivity coefficient | |
| CN102620836A (en) | Method for calibrating surface temperature of metal flat plate | |
| CN104611483B (en) | A kind of furnace temperature online test method based on cooling wall thermic load and kiln lining thickness measuring | |
| CN104568187B (en) | A kind of kiln temperature detection method and device | |
| CN203846046U (en) | On-line blast furnace temperature detection and acquisition system | |
| CN205119787U (en) | Rotary kiln furnace temperature measurement system | |
| JP4272343B2 (en) | Ambient temperature detection method and combustion control method in an industrial furnace | |
| CN201220947Y (en) | On-line detecting method for temperature of blast furnace chamber | |
| CN207035808U (en) | A kind of rotary kiln with temperature measuring equipment | |
| CN113155072B (en) | On-line detection method for thickness of ring forming material of pellet rotary kiln | |
| CN208254662U (en) | A kind of heating furnace board briquette detection system | |
| JPH11316118A (en) | Method for estimating thickness of refractory | |
| CN114184033A (en) | Method for detecting falling position, thickness and size of refractory material of rotary kiln | |
| CN103031397A (en) | On-line detection model for furnace temperature of blast furnace | |
| CN108709653A (en) | A kind of heating furnace board briquette detection method and terminal device | |
| CN208653673U (en) | Short branch electric thermo-couple temperature verifies furnace | |
| CN101798609A (en) | Method for measuring lining temperature by adopting thermo-couple to diagnose lining conditions of blast-furnace bottom and lower hearth | |
| CN108303378B (en) | Device and method for measuring and testing high-temperature emissivity of heat-proof tile | |
| CN107631811A (en) | A kind of roll surface temperature online test method and its device | |
| CN106288824B (en) | Sintering circular-cooler temperature of charge measuring method and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |