KR100775258B1 - Apparatus and method for controlling pushing in rotary kiln - Google Patents

Abstract

The present invention relates to a charging control device and a method of the rotary kiln, the present invention is formed in the passage formed by the ram kissing (127a-h) on the side of the preheater 108 of the cylinder, the gemstone of the preheater 108 And a plurality of charging machines 111a to h for pushing the fuel into the firing furnace 124 connected to the lower part through the transfer chute 126, and hydraulic cylinders 109a to h for reciprocating the charging machines 111a to h, and In the apparatus for controlling the preheater charging facility comprising a frame (110a ~ h) protruding to the outside provided on the rear end of the charging machine (111a ~ h) and the hydraulic cylinder (109a ~ h), the frame ( A plurality of limit sensors 132a to h (133a to h) 134a to h fixedly installed at positions 110a to h) and fixed to the chargers 111a to h are interlocked with the movement of the charger. Charging position detection means including a touch bar (128a ~ h) in contact with the limit sensors (132a ~ h) (133a ~ h) (134a ~ h) while moving; Temperature sensors 201a to h installed on an inner wall of the preheater 108 at upper ends of the charging machines 111a to h; Level sensors 202a to h installed on the inner ceiling of the preheater 108 to measure the level of gemstones charged to the charging machines 111a to h; A signal converter 140 for converting detection signals of the limit sensors 132a-h, 133a-h, 134a-h, temperature sensors 201a-h, and level sensors 202a-h into digital signals; An operation manipulation unit 155 for selecting an operation mode as a single operation mode or a multi-step operation mode; The charging control is performed according to the detection level of the level sensors 202a-h from the signal converter, and when the single operation mode is selected through the driving operation unit 155, the charging of the gemstone is controlled by a preset single stroke. When the multi-stage operation mode is selected, the preset position is set according to the detected temperature of the temperature sensors 201a to h while monitoring the position of the charging device by the limit sensors 132a to h, 133a to h, 134a to h. Instrument controller 150 for controlling the loading of gemstones in a multi-step stroke; Main point is provided with cylinder drivers (160, 170) for operating the hydraulic cylinder (109a ~ h) in accordance with the control of the instrumentation controller (150).

Rotary kiln, charging device, quicklime, preheater

Description

Charging control device and method of the rotary kiln {APPARATUS AND METHOD FOR CONTROLLING PUSHING IN ROTARY KILN}

1 is a process of manufacturing quicklime of a general rotary kiln.

2 is a front sectional view of a charging apparatus of a conventional rotary kiln.

3 is a plan view of the preheater of FIG. 2.

4 is a configuration diagram of a charging control device of a rotary kiln according to the present invention.

5 is an exemplary diagram of charging by the multi-step stroke of FIG. 4, FIG. 5A is a state diagram before operation, FIG. 5B is a first stroke operation state of the charging machine, and FIG. 5C is a two-stroke stroke operation state of the charging machine. 5D is a three-stage stroke operation state of the charging machine.

6 is a flowchart showing a charging control method according to the present invention.

Explanation of symbols on the main parts of the drawings

101,103,107,114: belt conveyor 102: storage hopper

105: drum washer 106: sorting machine

108: preheater 109a ~ h: hydraulic cylinder

110a ~ h: frame 111a ~ h: charging machine

112: cooler 113: vibration cutting machine                 

115a, b: flue gas duct 116: cyclone

117 duct 118 suction pen

119: wet dust collector 120: stack

121: surge hopper 122a ~ d: surfer roller

123: main motor 124: rotary kiln

125: burner 126: transfer chute

127a ~ h: RAM caching 128a ~ h: Touch bar

129a ~ h: Touch bar support 130a ~ h: Guide pike

131a ~ h: Output limit sensor 132a ~ h: 1 step limit sensor

133a ~ h: 2-stage limit sensor 134a ~ h: 3-stage limit sensor

135a ~ h: Axis 140: Signal converter

150: instrumentation controller 155: operation control panel

160,170: Cylinder Driver

The present invention relates to a charging control device and a method of a rotary kiln, and more particularly, to a limestone filled in a preheater formed while exchanging exhaust gas generated in the kiln through a preheater of a medium barrel and exchanging heat with gemstones in an evenly divided preheater. Method of controlling the charging of the preheater in a rotary kiln, by measuring the temperature and automatically controlling the charging stroke in multiple stages according to the measured temperature, thereby ensuring a uniform firing quality. And to a method thereof.

In general, the quicklime manufacturing process is as shown in Figure 1, Figure 1 is a quicklime manufacturing process of a conventional rotary kiln.

Referring to FIG. 1, the limestone loaded in the yard is temporarily stored in a storage hopper 102 and then cut out to a belt conveyor 104 using a vibration extruder (not shown). Ship to 105. The limestone transported to the centuries 105 is rotated with water to remove foreign substances on the surface, and then removes the powder (-10 mm) from the screener 106 so that the limestone is suitable for use in the kiln 124. ˜35 mm) is stored in a separate storage hopper (not shown). The sized limestone stored in the hopper is charged to the preheater 108 of the rotary kiln 124, and is heated to a high temperature of 900 ° C. or higher by the combustion heat of the burner 125 installed at the end of the kiln 124. Temperature).

At this time, the high temperature flue gas generated in the kiln 124 passes through the preheater 108 to which the passage is connected, and heat exchanges with the raw stones loaded in the preheater 108 to the outside through the duct 117 at a low temperature. Discharged. The limestone first calcined using the waste heat of the gas exhausted from the preheater 108 is sequentially operated by a plurality of pushers 109a to h (110a to h) installed evenly and radially. Limestone is charged into the kiln 124 while varying the number of times according to the amount of production.

At this time, the limestone (CaCO3) charged in the kiln 124 is pyrolyzed into quicklime (CaO) and carbon dioxide (CO2) at a high temperature, and the carbon dioxide (CO2), which is a gaseous phase, is removed through the exhaust gas, and the solidus lime (CaO) is recovered. Importantly used as refining agent for refining in steelmaking process. Therefore, high quality uniform quicklime is required for the production of high clean steel.

FIG. 2 is a front sectional view of a charging apparatus of a conventional rotary kiln, and FIG. 3 is a plan view of the preheater of FIG. 2. Referring to FIGS. 2 and 3, a conventional charging method will be described. The limestone enclosed to the outside of the 108a has various particle sizes, and the loading density of the limestone is different when the charging device is operated, and thus the loading density difference is formed. When 115b is biased, the hot flue gas flow path is discharged by biasing it to a place where the charging density is low, thereby making the calcination degree of the raw stone charged in the preheater 108 uneven, and as a result, the variation in the degree of plasticity in the preheating zone. Non-uniform products are produced in large quantities in a continuous manufacturing process.

In order to solve this problem, by adjusting the heat consumption using the temperature information of the product discharged from the kiln 124 to the cooler 112, or adjust the amount of limestone charged in the kiln 124, Increasing the raw unit of the gas or overloading the equipment not only causes a secondary problem but also does not solve the fundamental uniformity of plasticity.

The present invention has been made to solve the above problems, and therefore, an object of the present invention is to provide a preheater formed while the exhaust gas generated in the kiln passes through the preheater of the barrel and heat exchanges with the gemstones in the evenly divided preheater. The charging control device of the rotary kiln which measures the temperature of the filled limestone and automatically controls the charging stroke in multiple stages according to the measured temperature, thereby ensuring uniform firing quality. And to provide a method.

As a technical means for achieving the object of the present invention described above, the apparatus of the present invention is formed in the passage formed by the ramkeys on the side of the preheater of the cylinder, the raw material of the preheater to the kiln connected to the bottom through the transfer chute In the apparatus for controlling the preheater charging equipment comprising a plurality of charging device, a hydraulic cylinder for reciprocating the charging device, and a frame provided at the rear end of the charging device and the hydraulic cylinder to protrude outwardly. A position sensor means comprising: a plurality of limit sensors fixed to each position in the frame, and a touch bar fixedly installed in the charge device and in contact with the limit sensor while moving in conjunction with movement of the charge device; A temperature sensor provided on an inner wall of the preheater, at an upper end of each charging machine; A level sensor installed on an inner ceiling of the preheater to measure a level of gemstones charged to the charging machines; A signal converter for converting the detection signals of the limit sensor, the temperature sensor, and the level sensor into digital signals; An operation manipulation unit for selecting an operation mode as a single operation mode or a multi-step operation mode; The charging control is performed according to the detection level of the level sensor from the signal converter, and when the single operation mode is selected through the driving operation unit, the charging of the gemstone is controlled by a preset single stroke, and when the multi-step operation mode is selected, An instrument controller for monitoring the position of the charging machine by the limit sensor and controlling the charging of the gemstone in a multi-step stroke which is preset according to the detected temperature of the temperature sensor; And a cylinder driver for operating the hydraulic cylinder according to the control of the instrumentation controller.

In addition, as another technical means for achieving the object of the present invention, the method of the present invention measures the level of limestone loaded on top of the charging device of the preheater, and the level loaded at this measurement level and a preset set level. It is judged repeatedly if it is larger than this set level. If the loaded level is larger than the set level at this time, the suction pen is activated, the kiln temperature is raised, the exhaust gas heat exchange, and the preheating predetermined is performed. In the method for controlling charging, after the kiln is operated, when the multi-stage charging mode is selected, the preheating temperature of the gemstones loaded on the upper part of the charging machine is measured, and the average value of the measured temperatures is calculated, and then the average value and the angle Calculating a deviation from the measured preheat temperature; A second step of determining the magnitude of the temperature deviation by comparing the deviation between the average value and the measured temperature value calculated in the first step with a plurality of preset deviation setting values; A third step of performing corresponding stroke charging among predetermined multi-step strokes according to the temperature deviation magnitude of the second step; After performing the above steps, it is determined whether the kiln is stopped, if not stopped, characterized in that it comprises a fourth step to proceed to the first step.

EMBODIMENT OF THE INVENTION Hereinafter, the structure and effect | action of the charging control apparatus of the rotary kiln according to this invention are demonstrated in detail with reference to an accompanying drawing. In the drawings referred to in the present invention, components having substantially the same configuration and function will use the same reference numerals.

4 is a configuration diagram of a charging control device for a rotary kiln according to the present invention, Figure 5 is an illustration of charging by the multi-stage stroke of Figure 4, Figure 5a is a standby state before operation, Figure 5b is the first stage of the charging machine It is a stroke operation state, FIG. 5C is a two-stage stroke operation state of a charging machine, and FIG. 5D is a three stage stroke operation state of a charging machine.

4 and 5, the charging control apparatus of the rotary kiln according to the present invention is formed in the passage formed by the ram kissing (127a-h) on the side of the preheater 108 of the cylinder, preheating 108 A plurality of charging machines 111a to h for pushing the raw materials into the kiln 124 connected to the lower part through the transfer chute 126, and hydraulic cylinders 109a to h for reciprocating the charging machines 111a to h. And a preheater charging facility including frames 110a to h formed at the rear ends of the charging machines 111a to h and the hydraulic cylinders 109a to h to protrude outwards.

The charging control device of the rotary kiln is a plurality of limit sensors 132a to h (133a to h) 134a to h fixed to the frames (110a to h) for each position and the charging machine (111a to h) The position of the charging device position detecting means including a touch bar (128a ~ h) in contact with the limit sensor (132a ~ h) (133a ~ h) (134a ~ h) while fixedly installed in the movement And a temperature sensor 201a to h provided at an upper end of each of the charge devices 111a to h on the inner wall of the preheater 108, and to the inner ceiling of the preheater 108, respectively. Level sensors 202a to h for measuring the level of gemstones charged to 111a to h, the limit sensors 132a to h, 133a to h, 134a to h, temperature sensors 201a to h, and A signal converter 140 for converting the detection signals of the level sensors 202a to h into digital signals, a driving operation unit 155 for selecting a single operation mode or a multi-step operation mode as the operation mode, and the signal converter Charge control according to the detection level of the level sensor 202a-h, and when the single operation mode is selected through the driving operation unit 155, the stone loading is controlled by a preset single stroke, and the multi-step operation mode. When is selected, multi-step strokes are preset according to the detected temperature of the temperature sensors 201a-h while monitoring the position of the charging device by the limit sensors 132a-h, 133a-h, 134a-h. An instrument controller 150 for controlling the loading of gemstones and cylinder drivers 160 and 170 for operating the hydraulic cylinders 109a to h in accordance with the control of the instrument controller 150.

The limit sensors 132a-h, 133a-h, 134a-h of the charging device position detecting means move each charging device 111a-h of the preheater 108 to a distance from the preheater 108. Therefore, install them in 1, 2 and 3 stages.

The instrumentation controller 150 distinguishes the detection temperature into three stages of less than -50 ° C, less than -50 ° C and less than 0 ° C, and more than 0 ° C and less than 10 ° C. Load the gemstone in the single stroke, and load the gemstone in the two-stage stroke if it is more than -50 ℃ and less than 0 ℃. If it is more than 0 ℃ and less than 10 ℃, control the gemstone in the three-stroke stroke.

The cylinder drivers 160 and 170 are cylinder control valves for controlling the operation of the cylinder according to the control of the instrumentation controller 150, which may use a solenoid valve.

6 is a flowchart showing a charging control method according to the present invention.

Based on the accompanying drawings, the operation of the preferred embodiment of the present invention configured as described above will be described in detail below.

The charging control apparatus of the rotary kiln according to the present invention includes the configuration as shown in Figs. 4 and 5, and performs the control by the method as shown in Fig. 6, before the present invention, In the rotary kiln to which the apparatus of Fig. 6 is applied, as in step S61 shown in FIG. 6, the level of the limestone loaded on the charge chargers 111a to h of the preheater 108 is measured while charging the nuclear power plant to the preheater 108. Then, it is determined repeatedly whether the level loaded at this measurement level and the preset setting level is larger than the setting level. If the level loaded in this determination is greater than the set level, then as in step S62 shown in Fig. 6, the suction pen is operated, the kiln temperature is raised, the exhaust gas heat exchange, and the preheating predetermined, and the kiln is operated when the temperature is completed.

That is, when the kiln 124 is stopped and operated, after filling the gemstones in the preheater 108, the level is measured to fill the gemstones with a set value (75%) or more, and the suction pen 118 in the order. And a booster (not shown) for supplying the coke oven gas supplied to the burner 125 installed at the end of the firing furnace 124 and a blower for combustion air supply (not shown) operate to ignite the burner 125. In accordance with the temperature rise curve of the firing furnace 124, the furnace 124 is gradually heated while operating. At this time, the hot air of the high-temperature exhaust gas in the furnace 124 by the suction pen 118 undergoes heat exchange while passing through the raw material layer charged in the preheater 108 to preheat the work, and then through the exhaust duct 117. To be discharged.

After the operation of the kiln, after controlling the raw stone loading of the rotary kiln according to the present invention, this will be described in detail below.

First, when the multi-stage charging mode is selected through the driving operation unit 155 in the first step S63, the instrument controller 150 measures the preheating temperature of the raw stones loaded on the chargers 111a to h. After calculating the average value of the measured temperature, and calculates the deviation between the average value and each measured preheating temperature, which will be described in detail, while the hot exhaust gas continuously passes through the preheater 108, the # 1 to 8 Using the respective temperature sensors 201a to h installed above the charging machines 111a to h, the average temperature of the gemstones is calculated in real time by the instrument controller 150, and the temperature data of the calculated average temperature information is used. By comparing the temperature deviation between the corresponding temperature data and the average temperature data before operating # 1 ~ 8 charging machines 111a ~ h one by one according to the production amount.

On the other hand, when a single charging mode is selected through the driving operation unit 155, the instrument controller 150 controls the charging of the stone by a single stroke, that is, a uniform stroke, as in the prior art.

Next, in the second step S64, the deviation between the average value and the measured temperature value calculated in the first step S63 is compared with a plurality of preset deviation setting values, respectively, to determine the magnitude of the temperature deviation. In order to control the charging device with a multi-step stroke, the detection temperature is divided into three stages of -50 ° C., -50 ° C. or more and less than 0 ° C., and 0 ° C. or more and 10 ° C. or less. If the conditions are not met at the time of determining each temperature condition, other conditions are determined.

Next, in the third step S65, the corresponding stroke charging is performed among the predetermined multi-stage strokes according to the temperature deviation magnitude of the second step S64. In this third step, the determination result is less than -51 ° C. In the case of loading the gemstone in one step stroke, in the case of -50 ° C or more and below 0 ° C, the gemstone is loaded in the second step stroke, and in the case of 0 ° C or more and 10 ° C or less, it is controlled to load the gemstone in the third step stroke. Detailed description is as follows.

First, when the temperature deviation is greater than or equal to -51 ° C, the hydraulic cylinders 109a to h through the hydraulic actuators 160 and 170 until the moving distance of the charging devices 111a to h are closer to the first stage limit sensors 132a to h. Is operated to load the gemstone, and the limit sensors 132a to h that detect the contact send a signal to the instrument controller 150, in which the instrument controller 150 receives the signal through the hydraulic actuators 160 and 170. The operation of the cylinders 109a to h is stopped to stop the driving of the charging machines 111a to h.

In addition, when the temperature deviation is 0 ~ 50 ℃ or less, the hydraulic cylinders (109a ~ ~) through the hydraulic actuator (160, 170) until the moving distance of the charge (111a ~ h) to the two-stage limit sensor (133a ~ h) h) is operated to charge the gemstone, and the limit sensors 133a to h that detect the contact send a signal to the instrument controller 150, and at this time, the instrument controller 150 receiving the signal is a hydraulic actuator (160, 170). By controlling the operation of the hydraulic cylinder (109a ~ h) through to stop the drive of the charge (111a ~ h).

When the temperature deviation is 10 ° C. or less before the corresponding charging devices 111a to h operate, the hydraulic actuator until the moving distance of the charging devices 111a to h approaches the three-stage limit sensors 134a to h. The hydraulic cylinders 109a to h operate through the 160 and 170 to load the gemstones, and the limit sensors 134a to h that detect the contact send the signal to the instrument controller 150 to receive the signal. 150 controls the operation of the cylinders (109a ~ h) through the hydraulic actuator (160, 170) to stop the drive of the charge (111a ~ h).

Then, in the fourth step (S66), after performing the step, it is determined whether the kiln is stopped, and if not stopped, the process proceeds to the first step, that is, the charging machine of # 1 ~ 8 in the above-described method When all of the operations 111a to h are completed and the sequential operation of one cycle is completed, the charging amount is automatically accumulated in the instrumentation controller 150 for the strokes of the respective charging machines 111a to h. It is used for production information, and the first stage stroke loads 163 (kg-CaCO3) gemstones, and the second stage stroke loads 326 (kg-CaCO3) gemstones, and the third stage stroke day. In this case, 490 (kg-CaCO3) ore is charged.

And before the next cycle of the charging machine (111a ~ h) is operated again the average temperature of the raw stone in the preheater 108 is automatically recalculated and the operation is repeatedly operated until the kiln 124 is stopped. Control. Therefore, by the selective operation of the above-described charging machines (111a ~ h) it is possible to uniformly calcined limestone in the preheater 108 is not uniformly preheated.

According to the present invention as described above, the present invention, which acts as described above, continuously measures the factors (temperature deviation) that affect the quality of the product during firing due to the temperature deviation generated during the preheating process of the gemstones in the preheater 108. By measuring and controlling accurately and quickly, the quality of quicklime product can be secured uniformly.

The above description is only a description of specific embodiments of the present invention, and the present invention is not limited to these specific embodiments, and various changes and modifications of the configuration are possible from the above-described specific embodiments of the present invention. It will be apparent to those skilled in the art to which the present invention pertains.

Claims (6)

On the side of the cylindrical preheater 108, a plurality of which is formed in the passage formed by the ramkeys 127a-h, and pushes the gemstone of the preheater 108 into the baking furnace 124 connected to the lower portion through the transfer chute 126. After the charging machines 111a to h, the hydraulic cylinders 109a to h for reciprocating the charging machines 111a to h, and the charging machines 111a to h and the hydraulic cylinders 109a to h. In the device for controlling the preheater charging equipment comprising a frame (110a ~ h) provided at the end to protrude to the outside, The plurality of limit sensors 132a to h (133a to h) 134a to h fixedly installed at positions of the frames 110a to h and the charging machines 111a to h are fixedly installed. A charging device position detecting means including a touch bar 128a-h in contact with the limit sensors 132a-h, 133a-h and 134a-h while moving in conjunction with movement; Temperature sensors 201a to h installed on an inner wall of the preheater 108 at upper ends of the charging machines 111a to h; Level sensors 202a to h installed on the inner ceiling of the preheater 108 to measure the level of gemstones charged to the charging machines 111a to h; A signal converter 140 for converting detection signals of the limit sensors 132a-h, 133a-h, 134a-h, temperature sensors 201a-h, and level sensors 202a-h into digital signals; An operation manipulation unit 155 for selecting an operation mode as a single operation mode or a multi-step operation mode; The charging control is performed according to the detection level of the level sensors 202a-h from the signal converter, and when the single operation mode is selected through the driving operation unit 155, the charging of the gemstone is controlled by a preset single stroke. When the multi-stage operation mode is selected, the preset position is set according to the detected temperature of the temperature sensors 201a to h while monitoring the position of the charging device by the limit sensors 132a to h, 133a to h, 134a to h. Instrument controller 150 for controlling the loading of gemstones in a multi-step stroke; And a cylinder driver (160, 170) for operating the hydraulic cylinders (109a to h) according to the control of the instrumentation controller (150). The limit sensor (132a-h) (133a-h) (134a-h) of the charging device position detecting means Charging apparatus of the rotary kiln, characterized in that each of the charging device (111a ~ h) of the preheater 108 is installed in one, two, and three stages according to the distance from the preheater (108). . The method of claim 1, wherein the instrument controller 150 If the detection temperature is below -50 ℃, -50 ℃ or more and less than 0 ℃, 0 ℃ or more and 10 ℃ or less, it is classified into three stages. , The charging control device of the rotary kiln, characterized in that when the raw material is charged in a two-stage stroke when the temperature is more than -50 ℃ and less than 0 ℃, and the raw stone is charged in a three-stage stroke when 0 ℃ or more than 10 ℃. The level of limestone loaded in the upper part of the charging machines 111a-h of the preheater 108 is measured, and it is judged repeatedly that this measurement level and the level loaded by the preset setting level are larger than a setting level, When the level is higher than the set level, the suction pen is operated, the temperature of the kiln is raised, the exhaust gas heat exchange and the preheating predetermined are carried out. After the kiln is operated, when the multi-stage charging mode is selected, the preheating temperature of the gemstones loaded on top of the charging machines 111a to h is measured, the average value of the measured temperatures is calculated, and the average value and the respective preheating temperatures are measured. Calculating a deviation from the first step; A second step of determining the magnitude of the temperature deviation by comparing the deviation between the average value and the measured temperature value calculated in the first step with a plurality of preset deviation setting values; A third step of performing corresponding stroke charging among predetermined multi-step strokes according to the temperature deviation magnitude of the second step; After performing the step, it is determined whether the kiln is stopped, if it is not stopped, the charging control method of the rotary kiln characterized in that it comprises a fourth step to proceed to the first step. The method of claim 4, wherein the second step A charging control method for a rotary kiln, characterized in that the detection temperature is classified into three stages of less than -50 ° C, -50 ° C or more and less than 0 ° C, and 0 ° C or more and 10 ° C or less. The method of claim 5, wherein the third step As a result of the above judgment, when the temperature is lower than -51 ° C, the raw material is charged in one step stroke. When the temperature is lower than -50 ° C and lower than 0 ° C, the stone is loaded in two speed strokes. Charging control method of the rotary kiln, characterized in that the control to charge the raw stone.

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