KR100573585B1 - Ratary Kiln for making high quality calcium oxide - Google Patents

Abstract

A rotary kiln for calcining limestone ore to produce quicklime, the rotary kiln comprising: a gemstone separating screen having a cylindrical wire mesh structure inside the entrance side of the rotary kiln and fixed by a gemstone separating screen supporter; And a gemstone mixer fixed at equal intervals along the circumferential direction within the steel shell of the firing furnace at a predetermined distance from the gemstone separation screen. The limestone stacking layer measurement thermometer further includes a limestone stacking layer measuring thermometer for measuring the temperature of the limestone stacking layer, which is installed on the outer side of the fixed iron shell of the rotary kiln.

Since fine limestone and neutral limestone are separated in the kiln, the distribution of cracks due to the radiation and conduction of the limestone accumulation layer is uniformed, so that the quality of quicklime after firing can be evenly and continuously produced.

Quicklime, limestone, rotary kiln, cooler, screen

Description

Rotary kiln for making high quality calcium oxide             

1 is a schematic view of a conventional rotary kiln.

2 is a working situation diagram of a conventional rotary kiln.

3 is a cross-sectional view of a rotary kiln for producing high-quality quicklime of the present invention.

4 is a detailed process diagram of a rotary kiln for producing high-quality quicklime of the present invention.

5 is a detailed view of a rotary kiln for producing high-quality quicklime of the present invention.

※ Explanation of main code of drawing ※

10 ... Preheater 10a..Stone storage hopper

10b..Pusher 11 ... ROTARY KILN

11a.refractory 12 ... flame

13 ... BURNER 14 ... Primary Air Fan (FAN)

15 ... BOOSTER

17 ... FEEDER 18 ... Product Delivery Belt Conveyor

19 ... Cooling fan 20 ... Suction fan (I.D.FAN)

20A, 20B.DAMPER 21 ... Stack

22 ... Limestone Stacked Layer 22a..15mm or More Opal Limestone

22b..5 ~ 15mm crushed limestone 22c..5mm or less fine grain limestone

50 ... Stone separation screen (SCREEN) 51,51d..1st support

52,52d..2nd support

69,69a, 69b..Lumenstone Stacked Thermometer

70 ... Instrument Controller 71 ... Central Cab

72..Gemstone induction chute 53,54,55,56..1st raw stone mixer

53a, 54a, 55a, 56a .. Primary Gemstone Mixer Support

Secondary Gemstone Mixer

61,63..3rd Gemstone Mixer

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65,67..4th Gemstone Mixer

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The present invention relates to a kiln used to prepare quicklime, and more particularly, the limestone preheated in the preheating zone is loaded with fine grain limestone, lumped limestone, and allied limestone uniformly in the kiln. It relates to a rotary kiln to be uniformly mixed.

In general, rotary kilns use limestone to preheat, fire, and cool to produce finished lime products.

The limestone is washed in the washing process and then transferred to the preheater in the kiln. The limestone transferred to the preheater is preheated while passing through the pores between the limestones when the hot heater inside the rotary lime kiln is sucked from the suction fan.

When the limestone preheated in the preheating zone is put into the rotary kiln by the pusher, the raw material limestone is decarbonated and the gaseous carbon dioxide is released into the atmosphere while maintaining the high temperature required for production and the proper air ratio required for COG combustion. Produces quicklime products.

The lime produced inside the kiln is cooled in the cooler and then cut out in the feeder, and the hot hot air from the cooler is again used as the proper air ratio for burning the burner inside the kiln.

In the conventional limestone production process, it is necessary to use allele limestone having a particle size of 15 to 40 mm to obtain the desired quality limestone, but fine limestone, lumped limestone, and limestone are mixed in the process of loading limestone into the kiln by a pusher. It flows into the kiln.

Fine-grained limestone is generated in a large amount when it is charged into the kiln in the state that the external hardness of the limestone, which has been partially fired by the preheater in the preheating zone, is sucked by the high-heater in the kiln in the suction fan, and the crushed limestone is a raw material. Occurs when the limestone is transferred to the preheating zone after washing.

When limestones having different particle sizes are charged into the kiln and the kilns having a constant inclination angle rotate, the limestone is transferred from the inlet side to the outlet side and fired.

However, limestones having different particle sizes form a limestone stacking layer in the kiln. The limestone stacking layer has a disadvantage in that the heat of the decarburization process is not evenly transferred, resulting in an uneven state of the product.

The present invention has been made to solve the above problems, a rotary kiln for the manufacture of high-grade quicklime to make the limestone cumulative layer as thin as possible by separating and inputting the preheated limestone at the inlet side of the rotary firing furnace in the case of quicklime production by the size of particle size The purpose is to provide.

Another object of the present invention is to provide a rotary kiln for producing high-quality quicklime that can control the appropriate heat consumption according to the temperature change by sensing the temperature of the limestone cumulative layer in the outer shell of the kiln.

Another object of the present invention is to provide a rotary kiln for producing high-quality quicklime that can continuously produce high-quality quicklime by making uniform the distribution of the limestone charged in the kiln.

To achieve the object of the present invention as described above and the gemstone separation screen which is fixed by the gemstone separation screen support having a cylindrical wire mesh structure inside the inlet side of the rotary kiln; And a gemstone mixer fixed at equal intervals along the circumferential direction in the steel bar of the firing furnace at a predetermined distance from the gemstone separation screen.

In addition, the raw stone separation screen of the rotary kiln is characterized in that it further comprises a limestone accumulation layer measuring thermometer which is installed outside the fixed iron bar to measure the temperature of the limestone accumulation layer.

Hereinafter, a rotary firing furnace for producing a high-grade quicklime of the present invention will be described in detail with reference to the accompanying drawings.

The ore separation screen 50 is installed in the preheating zone of the kiln 11 connected to the hopper. Gemstone separation screen 50 is a wire mesh structure of a cylindrical shape. The ore separation screen 50 is made of a wire mesh having a size that distinguishes crushed limestone and allele limestone. The gemstone separation screen 50 is fixed to the kiln 11 using the gemstone separation screen support.

Behind the gemstone separation screen 50, a gemstone mixer is installed along the wall of the kiln 11.

The gemstone mixers 53 to 67 are installed at regular intervals along the circumferential direction at a predetermined distance of the gemstone separation screen 50 of the kiln 11.

The primary ore mixers 53 to 56 are installed at a predetermined distance from the ore separation screen 50. A plurality of primary raw stone mixers 53 to 56 are installed at equal intervals in the circumferential direction. The primary raw stone mixer uses the primary raw stone mixer supports 53a to 56a to fix the primary raw stone mixers 53 to 56 to the steel bar of the firing furnace after passing the refractory inside the firing furnace. The primary ore mixers 53 to 56 overcome the problem that the opposing limestone 22a, the lumped limestone 22b, and the fine-grained limestone 22c do not mix with each other in particle size in the rotating kiln. Limestone (22b), fine-grained limestone (22c) is to be well mixed when passing the primary raw stone mixer (53 ~ 56) in rotation.

Secondary gemstone mixers 57 and 59 are installed at a distance from the place where the primary gemstone mixers 53 to 56 are installed, and in the same manner, the tertiary gemstone mixers 61 and 63 and the quaternary gemstone mixers 65, 67). Secondary gemstone mixer, tertiary gemstone mixer, and quaternary gemstone mixer are also fired by secondary gemstone mixer support, tertiary gemstone mixer support and quaternary gemstone mixer support, as the primary gemstone mixers 53 to 56 are installed. It is fixed to the iron bar of (11) and plays the same role.

The burner 13, the primary air fan 14, the booster 15, the cooler (not shown), etc. are installed in the exit side of the kiln 11 similarly to a general rotary kiln.

The limestone accumulation layer measuring thermometers 69, 69a, and 69b are provided at regular intervals in the outer shell of the limestone accumulation layer 22 of the kiln 11. The limestone cumulative layer measuring thermometers 69, 69a, and 69b, which can measure temperatures at predetermined distances over the entire range of the limestone accumulating layer 22, are connected to the central cab 71 through the instrumentation controller 70.

Referring to the operation of the rotary kiln for producing a high-grade quicklime of the present invention having the configuration as described above are as follows.

 The preheated limestone cut out from the hopper 10a by the pusher 10b transfers the gemstone from the chute 72 at the inlet of the rotating kiln to the gemstone separation screen 50 mounted at the limestone accumulation layer 22.

The limestone transferred to the kiln is separated according to the particle size while passing through the ore separation screen 50. It is separated by the fine-grained limestone and the small-size fine limestone kiln, which are rotated integrally with the granite-separating screen 50, and rotate in the limestone accumulation layer 22 above the refractory 11a.

Fine-grained limestone and lumped limestone separated from the gemstone separation screen 50 are gradually maintained while maintaining the temperature of about 900 degrees Celsius in the kiln 11 together with the opposing limestone and gradually absorbing the hot air sucked from the suction fan 20. As the decarbonate process occurs, it is converted to quicklime and transported to the exit side of the kiln 11 which maintains the inclination angle.

Some decarbonated limestones are mixed again at the end of the ore separation screen 50. The smallest fine-grained limestone 22c is located on the inner side of the mixed limestone, the lumped limestone 22b is located on the middle, and the opposing limestone 22a is located on the outer side. The limestones past the gemstone separation screen 50 are displaced due to the difference in particle size, and decarburization is performed to some extent.

The limestone mixed again is the firing around the flame of the burner (13).

The limestone past the gemstone separation screen 50 first contacts the primary gemstone mixer and inverts the mixed limestone again. Since the kiln 11 is rotating, the positions of the fine-grained limestone 22c, the lumped limestone 22b, and the opposing limestone 22a are changed in the primary raw stone mixer located on the inner side of the kiln 11.

The limestone passing through the primary gemstone mixer is again passed through the gemstone mixers installed in the rear of the primary gemstone mixer, and the limestone is repositioned several times, and the firing is completed by contacting the high temperature caused by the flame of the burner 13.

By controlling the temperature of the process of separating the fine-grained limestone and the lumped limestone from the limestone separation screen 50 using the limestone cumulative measuring thermometers 69,69a and 69b, the operating conditions in the kiln 11 are controlled. .

The external temperature of the kiln 11 is measured by the limestone cumulative bed measuring thermometers 69, 69a and 69b and sent to the controller of the cab. The heat supply of the kiln is controlled by comparing the measured values of the limestone cumulative layer measuring thermometers 69, 69a and 69b with the set values.

If the iron bar temperature of the kiln 11 is measured to be higher than the set value, a large amount of allelic limestone is generated. Therefore, the temperature of the kiln is lowered. On the contrary, if the measured temperature is lower than the set value, fine grained limestone and lumped limestone are generated. Therefore, the temperature of the kiln is raised to produce quicklime of desired quality.

Rotary kiln for producing high-grade quicklime of the present invention having the configuration and action as described above is to separate the fine limestone and neutral limestone in the firing furnace to uniform the distribution of heat by the radiation and conduction of the limestone cumulative layer, It has the advantage that the quality of quicklime is even and can be produced continuously.

In addition, there is an advantage that the heat of the appropriate temperature is applied according to the temperature change in the kiln by measuring the temperature in the outer shell of the kiln.

Claims (2)

In a rotary kiln which calcined limestone to produce quicklime, A gemstone separation screen having a cylindrical wire mesh structure at the inlet side of the rotary kiln 11 and fixed by a gemstone separating screen supporter; A gemstone mixer fixed at regular intervals along the circumferential direction within the steel shell of the firing furnace 11 at a predetermined distance from the gemstone separation screen 50; Rotary kiln for manufacturing high-quality quicklime, characterized in that it comprises a. 2. The limestone accumulating layer measuring thermometer (69, 69a, 69b) according to claim 1, wherein the limestone separating screen (50) of the rotary kiln (11) is installed outside the fixed steel bar to measure the temperature of the limestone accumulating layer (69, 69a, 69b). Rotary kiln for manufacturing high-quality quicklime, characterized in that it further comprises.

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