CN101231144A - External heating rotary kiln and operation method thereof - Google Patents
External heating rotary kiln and operation method thereof Download PDFInfo
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- CN101231144A CN101231144A CNA2007101934526A CN200710193452A CN101231144A CN 101231144 A CN101231144 A CN 101231144A CN A2007101934526 A CNA2007101934526 A CN A2007101934526A CN 200710193452 A CN200710193452 A CN 200710193452A CN 101231144 A CN101231144 A CN 101231144A
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Abstract
An externally-heated rotary kiln (1) comprising a kiln inside cylinder (1) which rotates surrounding a shaft and an external cylinder (12) for guiding the heating gas to flow around the kiln inside cylinder is disclosed, the externally-heated rotary kiln heats in the kiln inside cylinder of a treated object while being axially transmitted. The kiln inside cylinder rotatablely supports on a movable side end part (13) which axially moves and on a fixed side end part (14); a device (114) for measuring axial heat stretching of the kiln inside cylinder and a plurality of non-contact thermometers (126) for measuring shell temperatures (T11 to T32) at a plurality of positions in axial direction of the kiln inside cylinder from an external wall part of the external cylinder are provided. The temperature in the rotary kiln which rotates surrounding the shaft can be accurately measured and corresponding to the temperature of the treated object so that the control of the heating temperature can be executed.
Description
Technical field
The present invention relates to external heating rotary kiln and method of operating thereof as carbide furnace, pyrolysis oven, heat-treatment furnace or similar device.
Background technology
External heating rotary kiln comprises that around the outside cylindrical shell of rotary kiln (the inner cylindrical shell of kiln) described rotary kiln (the inner cylindrical shell of kiln) pivots.Rotary kiln is heated from the outside by the heated air that flows in the externally cylindrical shell that is caused, and like this, when processed material axially transmitted in rotary kiln, heat treated was performed.External heating rotary kiln is also called the indirect rotary kiln, because rotary kiln is constructed to make that heated air does not contact processed material, and is widely used as carbide furnace or other stove, as pyrolysis oven, heat-treatment furnace and drying oven.
Utilize the above-mentioned characteristic of external heating rotary kiln, carried out organic waste such as the thermal decomposition of sewer mud are become the research of fuel.Particularly, organic waste is loaded into outside rotary kiln, and is thermal decomposited under the condition of Hybrid Heating gas not in hypoxic atmosphere, and to reclaim pyrolysis gas and carbide, the fuel gas and the solid fuel of acquisition are utilized.Under the situation that will obtain fuel gas, heating-up temperature is configured to high as far as possible, with the organic substance that gasifies efficiently.On the other hand, obtain under the solid-fuelled situation, need under the temperature lower, finish thermal decomposition, so that combustible is retained in the carbide than gasification temperature.Therefore, the control of the temperature in the rotary kiln is vital.
As being used for controlling the rotary kiln method of temperature of pivoting, proposed following method: pipe is mounted the temperature that detects with based on the temperature sensor of installing in the pipe along rotary kiln axis, the method (referring to JP11-211040A) of the output of control heater coil and the heating power of heated air burner; And, control the method (referring to JP2903045B) of the quantity of combustion air based on the temperature that the thermocouple that is located at the rotary kiln exit detects.Yet, because gas temperature is measured with any method in these methods in the rotary kiln, the carburizing temperature of substance to be processed not necessarily shows, and worries because error takes place for the interior radiation of kiln and the variation of convection equilibrium or the material that sticks on the temperature sensor.In addition, comprise the inlet character of the organic waste of sewage sludge, as processed amount and water content, it is huge to fluctuate, and makes the stable control of carburizing temperature be difficult to realize.
Summary of the invention
Consider that above-mentioned actual conditions propose the present invention, therefore the purpose of this invention is to provide a kind of external heating rotary kiln, wherein the temperature that the temperature in the rotary kiln that axis rotates can related (correspondence) substance to be processed is measured exactly, the stable control of heating-up temperature can be performed thus, and the method for operating of external heating rotary kiln is provided.
In order to solve the problem in the conventional art, the invention provides external heating rotary kiln, comprise the inner cylindrical shell of the kiln that pivots and be used to cause heated air mobile outside cylindrical shell around the inner cylindrical shell of kiln, described external heating rotary kiln is carried out heat treated when substance to be processed is axially transmitted in the inner cylindrical shell of kiln, it is characterized in that: the inner cylindrical shell of kiln be can be rotated to support on can be on axially movable removable side end and fixation side end, be used to measure kiln interior barrel axon to the device of thermal stretching and a plurality of contactless thermometer that is used for measuring the shell temperature of a plurality of positions that kiln interior barrel axon makes progress from the outside wall portions office of outside cylindrical shell be set up.
In optimal way of the present invention, the thermal stretching measurement mechanism comprises the overall thermal extension measurement device that is used to measure the overall thermal elongation that kiln interior barrel axon makes progress.In addition, the thermal stretching measurement mechanism comprises at least one the portion of hot extension measurement device that is used for measuring from outside cylindrical shell inner peripheral portion the thermal stretching of the mid portion that makes progress in kiln interior barrel axon.
In addition, method of operating as said external heating rotary kiln, the present invention uses following method of operating: the difference between conversion shell temperature and average shell temperature becomes under the situation that is not less than predetermined value, compressed air is injected on the outer surface of the inner cylindrical shell of kiln, adhere to the dust of kiln interior barrel external surface with removal, to be the thermal stretching rate that obtained by the measured value of thermal stretching measurement mechanism obtain divided by the linear expansion coefficient of the material of kiln inside cylindrical shell described conversion shell temperature, and described average shell temperature is that the measured value by contactless thermometer obtains.
In addition, method of operating as external heating rotary kiln, the present invention uses following method of operating: the difference between conversion shell temperature and average shell temperature becomes under the situation that is not less than predetermined value, perhaps under the situation of this state continuance scheduled time, the signal that impels the inner cylindrical shell of kiln to safeguard is produced, to be the thermal stretching rate that obtained by the measured value of thermal stretching measurement mechanism obtain divided by the linear expansion coefficient of the material of kiln inside cylindrical shell described conversion shell temperature, and described average shell temperature is that the measured value by contact tehermometer obtains.
In addition, the present invention uses the method for operating of following external heating rotary kiln, the average shell temperature that obtains according to contactless thermometer measure value wherein, externally the amount of the heated air that flows in the cylindrical shell is increased or reduces, thereby average shell temperature is maintained at the predetermined temperature zone, it is characterized in that: be not less than in the difference between conversion shell temperature and the average shell temperature under the situation of the state continuance scheduled time of predetermined value, average shell temperature is calibrated according to temperature difference, and, externally the average shell temperature of the amount utilization of the heated air that flows in cylindrical shell calibration is conditioned, and to be the thermal stretching rate that obtains of the measured value by the thermal stretching measurement mechanism obtain divided by the linear expansion coefficient of the material of kiln inside cylindrical shell described conversion shell temperature.
In the another kind of mode of external heating rotary kiln of the present invention, outside cylindrical shell is divided into a plurality of zones, contactless thermometer is set in each zone, is used for regulating the heated air quantity regulating device of heating gas flow and is used for further being provided with based on the temperature control equipment of the measured value control heated air quantity regulating device of the shell temperature in each zone.In preferred mode, the thermal stretching measurement mechanism comprises the regional thermal stretching measurement mechanism that is used for measuring from outside cylindrical shell inner peripheral portion the thermal stretching in each zone.In other optimal way, the thermal stretching measurement mechanism comprises and being used for predetermined amount of flow than the heated air distributor of the heated air of distributing a system to each several part, and the heated air total flow adjusting device that is used to regulate the heated air total flow of a system.
Another kind of mode as external heating rotary kiln, the invention provides a kind of external heating rotary kiln, it comprises the inner cylindrical shell of the kiln that pivots and is used to cause heated air mobile outside cylindrical shell around the inner cylindrical shell of kiln, described external heating rotary kiln is carried out heat treated when substance to be processed is axially transmitted in the inner cylindrical shell of kiln, it is characterized in that: be provided with and be used for being in a plurality of contactless thermometer that the shell temperature are measured in a plurality of positions that kiln interior barrel axon makes progress from the outer wall section of outside cylindrical shell.
Another kind of mode as external heating rotary kiln, the invention provides a kind of external heating rotary kiln, it comprises the inner cylindrical shell of the kiln that pivots and is used to cause heated air mobile outside cylindrical shell around the inner cylindrical shell of kiln, described external heating rotary kiln is carried out heat treated when substance to be processed is axially transmitted in the inner cylindrical shell of kiln, it is characterized in that: the inner cylindrical shell of kiln be can be rotated to support on and can be used to measure kiln interior barrel axon and be set up to the device of thermal stretching on axially movable removable side end and fixation side end.
According to external heating rotary kiln of the present invention, be used to measure kiln interior barrel axon to the device of thermal stretching and a plurality of contactless thermometer that is used for measuring the shell temperature of a plurality of positions that kiln interior barrel axon makes progress from the outer wall section of outside cylindrical shell be set up.Therefore, by making the thermal stretching rate that obtained by the thermal stretching measurement mechanism measured value linear expansion coefficient divided by kiln inside cylinder material, having got rid of the temperature of kiln shell accurately (conversion shell temperature) that radiation and convection current in the kiln change and stick to the measure error that the material on inner cylindrical shell of kiln or the temperature sensor causes can be detected.
In addition and since the kiln shell temperature be with kiln in the temperature of the part that directly contacts of substance to be processed, so the heat decomposition temperature of kiln shell temperature and substance to be processed is closely related, and reflect heated condition well.By carry out temperature control based on this kiln shell temperature, heating-up temperature can be controlled with being stabilized.Therefore, be used as under the situation of the carbide furnace that the fuel carbide is provided from organic waste for example at external heating rotary kiln of the present invention, according to the remaining ratio of required combustible component, carburizing temperature can be maintained at proper temperature, makes the high-quality carbonized fuel to obtain with being stabilized.
Equally, the conversion shell temperature of thermal stretching matrix (base) is compared with the average shell temperature of contactless thermometer, and the etch state that adheres to dust and the inner cylindrical shell of kiln thus on the outer surface of the inner cylindrical shell of kiln can be detected.Use following method: become in temperature difference under the situation that is not less than predetermined value, compressed air is injected on the outer surface of the inner cylindrical shell of kiln, adheres to the method for operating of the dust of kiln interior barrel external surface with removal; Continue under the situation of the scheduled time method of operating that the signal that impels the inner cylindrical shell of kiln to safeguard is produced in temperature difference; And according to temperature difference, average shell temperature is calibrated by radiation coefficient etc., thereby the operation of rotary kiln is continued the method for operate as usual.
In addition, externally cylindrical shell axially is divided into a plurality of zones, contactless thermometer is set in each zone, be used for regulating the heated air quantity regulating device of each zone heating gas flow and be used in the mode that the temperature control equipment based on the measured value control heated air quantity regulating device of the shell temperature in each zone further is provided with, based on the measured value of each regional mesochite temperature, the shell temperature can be controlled to make the shell temperature different in each zone.In addition, the temperature control in each zone, because the conversion shell temperature of thermal stretching matrix is compared the calibration of control temperature province with the average shell temperature of contactless thermometer, more reliable thus temperature control can be carried out, and therefore high-quality heat treated can be implemented.
Description of drawings
Fig. 1 is the sectional view that shows the described external heating rotary kiln profile of first embodiment of the invention;
Fig. 2 is the sectional view along Fig. 1 center line A-A;
Fig. 3 is the control flow chart that shows external heating rotary kiln;
Fig. 4 is the sectional view that shows the described external heating rotary kiln profile of second embodiment of the invention.
The specific embodiment
The present invention is described referring now to the embodiment that shows in the accompanying drawing.
Fig. 1 has shown that external heating rotary kiln 1 of the present invention is used as the example of carbide furnace.In Fig. 1, rotary kiln 1 comprises inner cylindrical shell 11 (kiln shell) and be used to cause the outside cylindrical shell 12 (muffle cover) that heated air flows around inner cylindrical shell 11.Inner cylindrical shell 11 is supported in can be on axially movable removable side end 13 and fixation side end 14, so that can pivot.In the removable side end 13 that forms inner cylindrical shell 11 intake sections, the auger conveyor 10 that is used to fill substance to be processed is set up, and in forming the fixation side end 14 of inner cylindrical shell 11 exit portion, the chute 15 that is used to discharge substance to be processed is set up.
More specifically, in the removable side end 13 of inner cylindrical shell 11, the ring frame 131 of rotatably mounted inner cylindrical shell 11 is set up, and the both sides of ring frame 131 be can be rotated to support on the upper end of supporting member 132, and described supporting member 132 is erected at swingably to be installed on the surface 130.Distance between the supporting-point of supporting member 132 is set to thermal stretching long-range and the inner cylindrical shell 11 of kiln, hereinafter describe in detail, and the moving up and down of removable side end 13 that the swing of supporting member 132 causes is held enough little.
In addition, the removable side end 13 of inner cylindrical shell 11 and fixation side end 14 form rotating part 11 and the not hermetic seal between the rotating part 13,14.In addition, in the coupling part between removable side end 13 and auger conveyor 10, dilation 133 is provided, and it absorbs the axial displacement of removable side part 13.
In the removable side end 13 of inner cylindrical shell 11, be used to measure the whole thermal stretching that is heated part, the measurement mechanism 114 of just inner cylindrical shell 11 overall thermal elongation D is provided.Measurement mechanism 114 utilizes the dial that is fixed on rotary kiln 1 mounting portion, measures the displacement of the indicator P in the removable side end 13 that is located at inner cylindrical shell 11.Measurement mechanism 114 can be to utilize calutron or similar device such as differential transformer to measure the position sensor of indicator P displacement.In addition, substitute the sensor that is used to detect continuous dislocation, the probe that is used to detect the predetermined displacement that has reached default can be set up, and perhaps range finder using laser can be used to detect displacement.
On the inner wall section of inner cylindrical shell 11, a plurality of fins of circumferencial direction inclination (or spiral, demonstration) are set up relatively.Inner cylindrical shell 11 rotates with desired speed by the drive source (not shown), and the substance to be processed of filling from entrance side can be transferred to outlet side by inner cylindrical shell, is heated simultaneously.In some cases, replace fin is set, inner cylindrical shell 11 is supported, and rotating around the axis that relative horizontal line tilts a little, substance to be processed is transferred to outlet side by the inclination and the rotation of inner cylindrical shell 11 thus.
Outside cylindrical shell 12 is fixed to the mounting portion by the supporting member (not shown), is in to allow inner cylindrical shell 11 rotations and moving axially, and the state of sealing between outside cylindrical shell 12 and the inner cylindrical shell 11 is provided.The total inner surface of outside cylindrical shell 12 is coated with insulating materials, and as shown in Figure 2, a side of inner space (side of inner cylindrical shell 11) externally is separated wall 120 on the whole length of cylindrical shell 12 and separates.Heated air lead-in portion 121 is defined at the downside of partitioned portion, and heated air transport portion 122 is defined at the upside of partitioned portion, and can be formed to the heated air flow channel of transport portion 122 from lead-in portion 121.The lead-in portion 121 of outside cylindrical shell 12 is connected with supply pipe 20, and heated air provides from heated air combustion furnace 2 by supply pipe 20.On the other hand, the transport portion 122 of outside cylindrical shell 12 connects heat air scale of construction damper 3 and air-introduced machine 4 by heated air carrier pipe 21.
The top of cylindrical shell 12 externally, three peepholes 123 are provided to be separated from each other in the axial direction, and each peephole 123 is provided with and is used for the measure portion displacement, portion of hot elongation D1, the D2 of just inner cylindrical shell 11, the measurement mechanism 124 of D3.Measurement mechanism 124 is made up of scope or video camera, scope or video camera are set on the peephole 123 of outside cylindrical shell 12, to face indicator P1, P2, the P3 that is located on inner cylindrical shell 11 external peripheral surfaces, and by being located at dial measurement indicator P1, the P2 in the scope visual field, the displacement of P3 relative measurement position, perhaps according to position measurement indicator P1, P2 on the image that obtains by video camera, the displacement of P3 relative measurement position.
In addition, the position of the transport portion 122 in contiguous outside cylindrical shell 12 tops, six windows 125 are configured to be separated from each other in the axial direction.Each window 125 is provided with contactless thermometer 126, and described contactless thermometer 126 is faced the external peripheral surface of the inside cylindrical shell 11 that pivots, to measure kiln shell temperature T 11 to T32 (Tn).As contactless thermometer 126, radiation thermometer can be used.In this case, the burning gases that contain cigarette ash and dust are used as the heated air that flows in the externally cylindrical shell 12 described below, make the IR wavelength of 3.9 μ m be preferably used as the response wave length of radiation thermometer, the IR wavelength of 3.9 μ m is not by flue dust, dust and burning gases influence.In addition, use near the two color thermometer of the wavelength of 1.0 μ m also to be fit to,, and more be difficult for the influence of raying coefficient (emissivity), even the corrosion of the outer surface of inner cylindrical shell 11 because it is influenced by burning gases, flue dust and dust less.
Then, being used as organic waste such as the thermal decomposition of sewer mud at rotary kiln 1 is that the method for operating of external heating rotary kiln 1 is illustrated based on the foregoing description under the situation of carbide furnace of fuel.
Heated air is fed to the outside cylindrical shell 12 of rotary kiln 1 from heated air combustion furnace 2 by the air inducing effect of air-introduced machine 4, makes the inside cylindrical shell 11 that is arranged in outside cylindrical shell 12 be heated from external peripheral surface by these heated air.The heating power of heated air combustion furnace 2 is held constant, and the heated air that heated air combustion furnace 2 provides is held predetermined high temperature.Yet, be used to heat of the fluctuation of the required heat of inner cylindrical shell 11, for example the change of the characteristic of substance to be processed, processed amount and moisture and changing according to the load that is introduced into the inner cylindrical shell 11 of kiln.
Therefore, the aperture of heat air scale of construction damper 3 and the revolution of air-introduced machine 4 are controlled based on the control logic that shows among Fig. 3 by temperature control equipment 5, make the kiln shell temperature T of measuring by the contactless thermometer 126 that is provided with in axial six positions 11 to T32 (Tn) be maintained in the predetermined temperature zone.
In Fig. 3, to T32, the temperature of (maximum six positions) is selected by selector switch 50 in the temperature of any one position or in a plurality of any positions from the kiln shell temperature T 11 of six measuring positions.Under the selecteed situation of the temperature of a position, selecteed kiln shell temperature is used as processing costs, under the selecteed situation of the temperature of a plurality of positions, the mean value of handling the 51 kiln shell temperature that obtain by averaging is used as processing costs, PID control utilizes processing costs to carry out, and makes this processing costs PV be maintained at setting value SV.
In PID control, and postponed to handle the proportional proportion control effect of difference (P control action) between 52 kiln shell Temperature Treatment value PV that influence and the setting value SV, with difference proportional integral control action perdurabgility (I control action), and be combined with the proportional derivative control action of difference pace of change (D control action), the output of PID control is inverted (reversed) (53) and is used as the aperture instruction, and the aperture of heat air scale of construction damper 3 is conditioned by above-mentioned instruction.In addition, the instruction of the aperture of heat air scale of construction damper 3 is subjected to postpone to handle 54 to be influenced, and is transformed into the processing costs in the revolution control of air-introduced machine 4.PID control is performed, and makes this processing costs PV be maintained at setting value SV, and the output of PID control is inverted (55) and is used as the revolution instruction of air-introduced machine 4, and the revolution of air-introduced machine 4 is regulated by this instruction.
Therefore, cardinal temperature control is to regulate by the aperture of heat air scale of construction damper 3 to carry out, and backup control is performed and makes the aperture of heat air scale of construction damper 3 be maintained in the preset range, by backup control, stable control can be performed, and overcomes the ingress load change.In addition, in above-mentioned control, delay in the air-introduced machine 4 revolutions control is handled the delay of 54 apertures that are set to larger than heat air scale of construction damper 3 in regulating and is handled 52, the short time variations in temperature is only regulated by the aperture of heat air scale of construction damper 3 and just can be realized thus, and the revolution that need not carry out air-introduced machine 4 is controlled, and long-time variations in temperature is by the revolution control realization of air-introduced machine 4.Therefore, more stable temperature control can be performed.
By the upstream side as the above-mentioned rotary kiln of controlling 1, the dryer (not shown) is set up in temperature.Stirred and dried the oven dry mud 71 that feasible wherein moisture is controlled to predetermined value by dryer, introduced the inside cylindrical shell 11 of rotary kilns 1 by auger conveyor 10.The oven dry mud 71 that is introduced into inner cylindrical shell 11 is heated in the transmission course of the outside in the rotation along with inner cylindrical shell 11.Therefore, remaining moisture is at first evaporated, and the thermal decomposition of organic principle is carried out after water evaporates is finished.Therefore, when pyrolysis gas was produced, organic principle was carbonized, and discharged as the carbide 72 (solid fuel) with predetermined degree of carbonisation from chute 15.
On the other hand, the pyrolysis gas 73 that thermal decomposition produces is introduced into dry gas combustion furnace (not shown) by chute 15, and burns with the burning gases of auxiliary fuel or heat exchange in heated air carrier pipe 21.Some burning gases flow back into heated air combustion furnace 2, and the auxiliary fuel in heated air combustion furnace 2 burns, and are used for heating rotary kiln 1.Because heated air is burning gases, so it contains cigarette ash, dust and dust.If error to the external peripheral surface of inner cylindrical shell 11, may take place between temperature T 11 to T32 (Tn) that so contactless thermometer 126 is measured and the actual kiln shell temperature in dust adhesion.
Therefore, extend the measured value of D based on the overall thermal of 114 acquisitions of the measurement mechanism in the removable side end 13 that is located at inner cylindrical shell 11, the mean value of kiln shell temperature (conversion shell temperature) is determined, and the mean value (Tn) of this value and aforementioned kiln shell temperature T 11 to T32 compares, and the dust state that adheres to kiln shell thus can be detected.
The overall thermal of the inner cylindrical shell 11 of kiln shell is extended as D (mm,=Δ L), the length that is heated part of the inner cylindrical shell 11 of kiln is L (m), the linear expansion rate of kiln material is α (mm/m a ℃), conversion shell temperature T s (℃) obtain divided by kiln material linear expansion rate α by overall thermal percentage elongation D/L (Δ L/L), be represented as
Ts＝D/αL
Difference between conversion shell temperature T s and average shell temperature T n is represented as
ΔT＝(D/αL)-Tn
And become under the situation that is not less than setting value, under the situation of the perhaps this state continuance scheduled time, can judge that dust adhesion is on kiln shell.In this case, compressed gas can be injected on inner cylindrical shell 11 outer surfaces of kiln to remove dust from being located at nozzle 127 (Fig. 2) on the outside cylindrical shell 12, and the signal that perhaps is used to impel inner cylindrical shell 11 to safeguard is produced.
In addition, to the situation of kiln shell, though be lower than conversion shell temperature T s based on the elongation of kiln inside cylindrical shell 11 overall thermal based on the average shell temperature T n of contactless thermometer 126, this species diversity does not hinder the operation of rotary kiln 1 itself immediately in dust adhesion.Therefore, become at temperature difference T (perhaps under the situation of this state continuance scheduled time) under the situation that is not less than setting value, according to temperature difference T, average shell temperature utilizes the radiation coefficient of contactless thermometer etc. to calibrate, the heat air scale of construction that flows into outside cylindrical shell 12 by heat air scale of construction damper 3 or air-introduced machine 4 is to use the average shell of calibration temperature controlled, and the operation of rotary kiln 1 also can be carried out as usual thus.
In addition, measured value based on the measurement mechanism 124 of the portion of hot elongation D1, the D2 that are used to measure inner cylindrical shell 11, D3, the kiln shell temperature of this part (the part shell temperature of conversion) is determined, and this value with based on the kiln shell temperature T 11 to T32 of contactless thermometer 126 (in the example that in Fig. 1, shows, the mean value T1 of T11 and T12, the mean value T2 of T21 and T22, the mean value T3 of T31 and T32) compare, the state of the sum of errors adhesion dust of the measured value of each part P1, P2 of the inner cylindrical shell 11 of kiln and P3 can be detected thus.In portion of hot elongation D1 to D3, D2 and D3 must use the value that obtains by portion of hot elongation D1, the D2 that deducts fixation side end 14 sides from the displacement of actual measurement.
Be provided with in the present invention under the situation about carrying out in the rotary kiln 41 in a plurality of zones that axially have the different heating temperature that shows among Fig. 4, the above-mentioned measurement mechanism 124 that is used to measure the inner elongation of cylindrical shell 11 portion of hot D1, D2, D3 is useful.Hereinafter, the rotary kiln 41 of second embodiment will describe in conjunction with this Fig. 4.Because the rotary kiln 41 of second embodiment has the basic structure identical with the rotary kiln 1 of first embodiment, so mark is applied on the components identical, and their explanation has been omitted.
In Fig. 4, for rotary kiln 41, the inside of outside cylindrical shell 12 is divided into three regional Z1 to Z3 by partition wall 42 and 43, heated air is supplied from heated air combustion furnace 2 with being assigned with, and the heat air scale of construction damper 31 to 33 that is used for control band Z1 to Z3 heating gas flow is provided respectively.
In addition, for rotary kiln 41, in each zone of regional Z1 to Z3, the measurement mechanism 124 and two the contactless thermometers 126 (T11 to T32) that are used for measure portion thermal stretching (D1, D2, D3) are set up.Measured value T1, T2, T3 (the mean value T1 of T11 and T12, the mean value T2 of T21 and T22, the mean value T3 of T31 and T32) that the aperture of each heat air scale of construction damper 31 to 33 is based on kiln shell temperature among each regional Z1 to Z3 control.The amount that flows through the heated air of each regional Z1 to Z3 thus is conditioned, and makes that the kiln shell temperature among each regional Z1 to Z3 can be maintained at different design temperatures.
Conversion shell temperature T s1 among each regional Z1 to Z3, Ts2, Ts3 (D1/ α L1, D1/ α L2, D1/ α L3, wherein L1, L2 and L3 are respectively each regional length) portion of hot elongation D1, the D2, the D3 that are based among each regional Z1 to Z3 determine, measured value T1, T2, the T3 of the kiln shell temperature among this value and each regional Z1 to Z3 compare, to determine temperature difference T1, Δ T2, Δ T3.Therefore, temperature error and the dust adhesion state among each regional Z1 to Z3 can be detected.At this moment, needless to say, the method that the conversion shell temperature T s that aforementioned overall thermal elongation D determines and the mean value of kiln shell temperature T 11 to T32 compare can be performed simultaneously.
In addition, aperture at each heat air scale of construction damper 31 to 33 is maintained under the state of predetermined ratio, the revolution of air-introduced machine 4 can be controlled, make the kiln shell temperature in any zone, for example be positioned at the kiln shell temperature T 3 (mean value of T31 and T32) of the exit region Z3 in downstream, be maintained at the predetermined temperature zone.In this case, the measurement mechanism 124 that is used for the measure portion thermal stretching can only be provided with at exit region Z3.
It above is the description of the embodiment of the invention.The invention is not restricted to the foregoing description, various improvement and variation can be made based on technological thought of the present invention.For example, in the above-described embodiments, be provided with the rotary kiln that six contactless thermometers 126 and three are used to measure the measurement mechanism 124 of axial component thermal stretching and be shown.Yet the quantity of these elements can suitably be provided with.In addition, in second embodiment, be provided with at the trizonal rotary kiln that axially has different kiln shell temperature and be shown.Yet the quantity in zone is not limited to three, and each regional length can be different.
Claims (11)
1. external heating rotary kiln, comprise the inner cylindrical shell of the kiln that pivots and be used to cause heated air mobile outside cylindrical shell around the inner cylindrical shell of kiln, described external heating rotary kiln is carried out heat treated when substance to be processed is axially transmitted in the inner cylindrical shell of kiln, it is characterized in that:
The inner cylindrical shell of kiln be can be rotated to support on the removable side end and fixation side end that can move in the axial direction, is provided for measuring kiln interior barrel axon to the device of thermal stretching be used for from a plurality of contactless thermometer of the shell temperature of a plurality of positions that the outer wall section measurement kiln interior barrel axon of outside cylindrical shell makes progress.
2. external heating rotary kiln according to claim 1 is characterized in that: the thermal stretching measurement mechanism comprises the overall thermal extension measurement device that is used to measure the overall thermal elongation that kiln interior barrel axon makes progress.
3. external heating rotary kiln according to claim 1 is characterized in that: the thermal stretching measurement mechanism comprises at least one the portion of hot extension measurement device that is used for measuring from outside cylindrical shell inner peripheral portion the thermal stretching of the mid portion that makes progress in kiln interior barrel axon.
4. the method for operating of external heating rotary kiln as claimed in claim 1, it is characterized in that: the difference between conversion shell temperature and average shell temperature becomes under the situation that is not less than predetermined value, compressed air is injected on the outer surface of the inner cylindrical shell of kiln, adhere to dust on the kiln interior barrel external surface with removal, to be the thermal stretching rate that obtained by the measured value of thermal stretching measurement mechanism obtain divided by the linear expansion coefficient of the material of kiln inside cylindrical shell described conversion shell temperature, and described average shell temperature is that the measured value by contactless thermometer obtains.
5. the method for operating of external heating rotary kiln as claimed in claim 1, it is characterized in that: the difference between conversion shell temperature and average shell temperature becomes under the situation that is not less than predetermined value, perhaps under the situation of this state continuance scheduled time, the signal that generation impels the inner cylindrical shell of kiln to safeguard, to be the thermal stretching rate that obtained by the measured value of thermal stretching measurement mechanism obtain divided by the linear expansion coefficient of the material of kiln inside cylindrical shell described conversion shell temperature, and described average shell temperature is that the measured value by contactless thermometer obtains.
6. the method for operating of external heating rotary kiln as claimed in claim 1, wherein, according to the average shell temperature that obtains from the measured value of contactless thermometer, externally the amount of the heated air that flows in the cylindrical shell is increased or reduces, thereby average shell temperature is maintained at the predetermined temperature zone, it is characterized in that: be not less than in the difference between conversion shell temperature and the described average shell temperature under the situation of the state continuance scheduled time of predetermined value, described average shell temperature is calibrated according to described temperature difference, and, externally the average shell temperature of the amount utilization of the heated air that flows in cylindrical shell calibration is conditioned, and to be the thermal stretching rate that obtains of the measured value by the thermal stretching measurement mechanism obtain divided by the linear expansion coefficient of the material of kiln inside cylindrical shell described conversion shell temperature.
7. external heating rotary kiln according to claim 1, it is characterized in that: outside cylindrical shell is divided into a plurality of zones, described contactless thermometer is set in each zone, further is provided with the heated air quantity regulating device of the heating gas flow that is used for regulating each zone and is used for temperature control equipment based on the measured value control heated air quantity regulating device of the shell temperature in each zone.
8. external heating rotary kiln according to claim 7 is characterized in that: described thermal stretching measurement mechanism comprises the regional thermal stretching measurement mechanism that is used for measuring from outside cylindrical shell inner peripheral portion the thermal stretching in each zone.
9. according to claim 7 or 8 described external heating rotary kilns, it is characterized in that: described thermal stretching measurement mechanism comprises and being used for predetermined amount of flow than the heated air distributor of the heated air of distributing a system to each several part, and the heated air total flow adjusting device that is used to regulate the heated air total flow of a system.
10. external heating rotary kiln, comprise the inner cylindrical shell of the kiln that pivots and be used to cause heated air mobile outside cylindrical shell around the inner cylindrical shell of kiln, described external heating rotary kiln is carried out heat treated when substance to be processed is axially transmitted in the inner cylindrical shell of kiln, it is characterized in that:
Be provided with and be used for being in a plurality of contactless thermometer that the shell temperature are measured in a plurality of positions that kiln interior barrel axon makes progress from the outer wall section of outside cylindrical shell.
11. external heating rotary kiln, comprise the inner cylindrical shell of the kiln that pivots and be used to cause heated air mobile outside cylindrical shell around the inner cylindrical shell of kiln, described external heating rotary kiln is carried out heat treated when substance to be processed is axially transmitted in the inner cylindrical shell of kiln, it is characterized in that:
The inner cylindrical shell of kiln be can be rotated to support on can be on axially movable removable side end and fixation side end, and is provided with and is used to measure the device of kiln interior barrel axon to thermal stretching.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007-014619 | 2007-01-25 | ||
| JP2007014619A JP5235308B2 (en) | 2007-01-25 | 2007-01-25 | Externally heated rotary kiln |
| JP2007014619 | 2007-01-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101231144A true CN101231144A (en) | 2008-07-30 |
| CN101231144B CN101231144B (en) | 2010-06-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101934526A Active CN101231144B (en) | 2007-01-25 | 2007-11-27 | External heating rotary kiln and operation method thereof |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP5235308B2 (en) |
| CN (1) | CN101231144B (en) |
| HK (1) | HK1114899A1 (en) |
| TW (1) | TWI341915B (en) |
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- 2007-10-29 TW TW96140599A patent/TWI341915B/en active
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Also Published As
| Publication number | Publication date |
|---|---|
| TW200831828A (en) | 2008-08-01 |
| JP2008180451A (en) | 2008-08-07 |
| CN101231144B (en) | 2010-06-09 |
| JP5235308B2 (en) | 2013-07-10 |
| HK1114899A1 (en) | 2008-11-14 |
| TWI341915B (en) | 2011-05-11 |
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