KR100729131B1 - Method of producing powderde Calcium Oxide and it's device - Google Patents

Abstract

In the present invention, a limestone powder or limestone slab having a granule diameter of 4 to 30 mm is dropped on a continuously rotating flat plate inside a firing furnace in a kiln maintained at a furnace temperature of 850 ° C to 1,250 ° C. It relates to a continuous raw lime production method and apparatus for agitating the powder raw material (limestone powder or limestone sludge) dropped on a flat plate, and is plastically discharged by a conveyor belt installed in the furnace.

Powdered limestone, limestone powder, kiln, limestone firing, agitator, kiln, quicklime

Description

Manufacture method of continuous powder lime and its manufacturing method {Method of producing powderde Calcium Oxide and it's device}             

1A is a plan view showing a firing furnace of the present invention.

FIG. 1B is a sectional view of the cross section of FIG. 1A; FIG.

2 is a cross-sectional view taken along the line A-A of FIG.

Figure 3a is a cross-sectional view showing a combustion apparatus of the present invention.

Figure 3b is a sectional view showing a harmful gas discharge device in the present invention.

4 is a cross-sectional view taken along the line B-B in FIG.

Figure 5a is a cross-sectional view showing a stirrer installed in the furnace of the present invention.

Figure 5b is a cross-sectional view showing the attachment of the stirring blade in the present invention.

Figure 5c is a rear view of the stirring blade according to the present invention.

Figure 6 is a side view showing a conveyor provided in the conidia lime production apparatus according to the present invention.

7 is a side view showing a conventional firing furnace

<Description of Signs of Major Parts of Drawings>

100. Firing furnace 101. Refractory insulation 102. Insulation

103. Shell 120. Supply part 121. Supply pipe

122. Guide tube 123. Preheater 130. Superstructure

131. Inner vertical support beam 132. Outer vertical support beam 133. Inner support beam

134. Outer support beam 135. Upper connection beam 140. Combustion apparatus
141.Burner Insert
142. Burner 143. Gas Supply Line 144. Air Supply Line
150. Drive motor 151. Drive shaft 152. Pinion
153 rack 155 stirrer 156 stirring shaft
157. Stirring blade 158. Set screw 159, 159 '. Agitator fixing groove
160. Substructure 200. Conveyor 201. Scraper
203. Support shaft 204. Drive motor 205. Collector
206. Conveyor Belts 207, 207 '. Sprocket 190. Support structure
191. Shore 192. Bearing 193. Joints
164. Lower support beam 172. Connecting plate

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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the firing of limestone in powder form, and relates to a continuous method of producing lime and a production apparatus thereof, which enable continuous production of limestone in powder form, which has not been calcined by a conventional firing method.

Conventionally, limestone sludge or dolomite sludge produced in steel mills is almost discarded and dumped in a landfill because there is no use place, but the present invention does not discard the raw material by drying the powder raw material and pretreatment with powder of 2 mm or less. After recovering and manufacturing using the kiln according to the present invention, the heat source unit of the firing is significantly reduced, and the manufacturing facilities can be installed in various sizes from large to small, so that the required construction cost is low and the product competitiveness is excellent, in particular, continuous production of the present invention. This significantly improved productivity.

In general, firing is not possible due to fine lime, but even if firing, the efficiency was very low.

In order to solve the above problems, the inventors of the patent registration No. 2497834, "Method of manufacturing lime", limestone powder generated as a by-product from limestone mines or limestone sludge generated in steel mills are not utilized as industrial wastes and produce pollution. 7 is a side view of a calcination furnace used in the "method of manufacturing conical lime", and the limestone powder or limestone sludge having a particle size of 2 mm or less is usually formed in the calcination furnace. On top of this, the upper surface of the furnace is provided with a rotatable stirrer, and the powdered raw material calcined while stirring the powdered raw material (limestone powder or limestone sludge) placed on the furnace by the stirrer is discharged through the discharge port. Was about.

Accordingly, the present invention relates to a continuous production method and apparatus for producing conidia lime directly with analytical lime, and in particular, a method for producing conidia lime that can be more efficiently calcined all the firing raw materials, such as analytical lime that requires firing. And to the apparatus.

Preparation of quicklime, which has been carried out in addition to the patent invention of the present inventors, is to be prepared by injecting calcite into the furnace together with fuel, such as a rotary kiln or a shaft, to improve the breathability. This was only possible when the feed was lumped. The reason for this is that in order to increase the firing efficiency, the air permeability should be good. Therefore, according to the inventor's previously filed "prepared lime production method", all the limestone raw materials that require calcination are converted into circular form when the shape of granules as a raw material of limestone is spherical. Firing is possible up to a powder phase of 1 m / m or less in diameter (hereinafter referred to as "granular diameter"), and the firing efficiency is higher as the powder is close to a fine powder of 100 mesh or less.

However, since the patented invention is not continuous, only quick lime can be manufactured, it is possible to discharge the quick lime which has been fired in the furnace after the firing is completed in the furnace. There was a problem in that the manufacturing time and manufacturing cost are increased by the cooling of the furnace.

In order to calcify unanalyzed limestone, it is necessary to make pelletized limestone and pelletize it or impart breathability to finely divided limestone. In the case of the pelletizing, the pelletizing requires excessive time and cost, and the pelletizing itself is difficult. When wet, there is a problem that the efficiency is lowered due to moisture, and when attempting to impart breathability to unanalyzed lime, a method and a device that can impart breathability to powder limestone etc. have not been invented until now.

Accordingly, the present invention provides a combustion method and apparatus for sintering, in particular a sintered product stirring method for imparting breathability to a sintered body, and in particular, to improve breathability when powder particles are subjected to heat, that is, powdery limestone or limestone sludge It is aimed to shorten the firing time, increase the productivity, and improve the firing efficiency by continuously firing the powdered limestone raw material which has little air permeability by stirring in the kiln to produce powdery limestone.

Hereinafter, the present invention will be described in more detail with reference to the drawings as temporary examples.
The present invention promotes endothermic reaction of limestone or limestone sludge by a preheater of a guide tube injecting limestone powder or limestone sludge in the production of conical lime, and maintains the temperature in the kiln in an atmosphere of 850 to 1,250 ° C. A limestone powder or limestone sludge having a granule diameter of 30 mm or less is placed on the flat plate 161 of the kiln, and the hourly rotational speed of the flat plate 161 of the kiln is maintained at 0.5 to 5.0 rph, and the agitator 155 provided inside the kiln is provided. The limestone powder or limestone sludge accumulated on the plate by the stirring blade 157 of the a) is stirred, and the firing and discharging is performed by a conveyor (200) equipped with a scraper spatula (201c). In order to manufacture the method and such conical lime, a wall is formed in the order of the refractory insulating material 101, the heat insulating material 102, and the shell 103, and the material supply is performed. The unit 120, the upper structure 130, the lower structure 160, the support structure 190, the burner 142, the gas exhaust device 145, the stirrer 155, and the conveyor belt ( It relates to a condensed lime manufacturing apparatus, characterized in that the condensed lime is discharged by the scraper 201 attached to the upper side of the 206.

The present invention will be described in detail below with reference to the accompanying drawings.

1 shows a plan view of the firing furnace of the present invention.

Limestone powder or limestone sludge is introduced through the limestone supply pipe 121 of the firing furnace of the present invention.

It is supplied into the firing furnace 100 through a guide tube connected to the limestone supply pipe 121, and a pre-heater is installed inside the guide tube 122 to help the endothermic reaction of limestone.

When limestone is chemically subjected to heat of about 825 ° C. or more, brief endothermic reaction occurs as follows, and quicklime is easily decarbonated to obtain quicklime.

That is, CaCO ₃ → CaO + CO ₂ ↑

However, when the firing temperature is constant, the smaller the particle diameter of the limestone is, the larger the surface area ratio to receive heat, and the shorter the time required for heat to reach the core portion is shortened. Therefore, when the limestone particle size is set to 2 mm or less, In an atmosphere of approximately 825 ° C. or more, the heat penetrates deeply to the deeper parts of the powder particles in an instant that is incomparable to that of calcite, and the CO ₂ gas is actively released to complete the firing.

The most important thing in calcination of powdered limestone is whether the powder particles can be easily contacted with heat and whether it can be fired uniformly, which is closely related to how to impart breathability to powdered limestone and the like.

A furnace with a diameter of 3000 mm Ø was fabricated and heated in a furnace atmosphere temperature of 900 ° C., 950 ° C., 1000 ° C., 1050 ° C., and 1100 ° C. by the combustion device, and then the raw materials shown in Table 1 were burned from the top cover. ) While maintaining the rotational speed of the plate at 0.5 to 1.0 rph (revolution per hour) while weighing it in advance so as to accumulate to 15 cm thick. Firing degree measurement method was determined by the degree of the amount of heat loss (Ig. Loss).

The experimental results were as follows.

As shown in Table 2, the pyrolysis temperature of limestone was theoretically different depending on the temperature distribution of 825 ℃ or in the furnace, and firing was performed even at 900 ℃, but it was completely timed (compared to other high temperatures) to complete the firing. The higher the furnace temperature, the faster the pyrolysis rate of limestone and the shorter the complete firing time. Ig here When the loss was more than 41.5% by weight, it was confirmed that it was completely fired. In addition, as shown in Table 3, the required heat unit for complete firing according to the particle size was compared.

The criterion of passing time of the firing agent in the laboratory is determined from the start of operation of the combustion device to the start of discharge after the input of raw materials.

It is completely calcined with a very small amount of heat required compared to a heat source unit used in a general soil furnace or a shaft furnace, so that the fuel consumption can be drastically reduced, and the cost of going through the grinding process to manufacture conventional powdered lime Will also save.

도 1(도 1a, 도 1b)에 도시된 일실시예로서의 본 발명상의 연속식 분생석회 제조장치는 원재료 공급구간, 소성구간, 배출구간으로 나누어지고, 상부구조(130)와, 하부구조(160), 지지구조(190)와 석회석 등의 재료를 공급하는 재료 공급부(120)와, 소성이 완료된 석회석을 배출하는 컨베이어(200)로 구성된다.

Continuous conical lime production apparatus according to the present invention as an embodiment shown in Figure 1 (Fig. 1a, 1b) is divided into a raw material supply section, firing section, discharge section, the upper structure 130 and the lower structure 160 , A support structure 190 and a material supply unit 120 for supplying materials such as limestone, and a conveyor 200 for discharging the finished limestone.

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FIG. 2 is a cross-sectional view taken along the line A-A of FIG. 1 and is a material supply unit 120 for supplying a material such as limestone.

The material supply unit 120 is a limestone supplied from the outside of the kiln 100 is supplied through a screw conveyor 121a, the limestone supplied through the limestone supply pipe 121 connected to the screw conveyor 121a is a guide tube 122 The limestone introduced into the kiln through the guide tube, and the limestone flowing through the guide tube has a predetermined endothermic reaction by a pre-heater 123 provided inside the guide tube.

The firing furnace 100 which is supplied with the material from the outside as described above is composed of the upper structure 130 and the lower structure 160 and the support structure 190 for supporting the lower structure.

The upper structure 130 has inner and outer support beams 133 and 134 connected to upper surfaces of the vertical support beams 131 and 132 formed inside and outside, and the inner and outer support beams 133 and 134. Are each connected by an upper connecting beam 135.

Firing furnace fixing bars 136 are attached to the firing side of the inner vertical support beam 131 and the outer vertical support beam 132 as shown in FIG. 4.

The interior of the firing furnace 100 is formed of a wall of the firing furnace 100 by the refractory insulation material 101, the thermal insulation material 102, the iron shell 103, to prevent the damage of the material due to the high temperature, and to maintain a constant temperature Make it work.

The kiln fixing bar 136 is attached to the iron shell 103 that is the outside of the furnace to fix the upper structure 130.

In addition, as shown in FIG. 3A or FIG. 4, the lower structure 160 includes a flat plate 161 on which materials input from the outside are placed, and an insulating material 162 for maintaining an internal temperature and an iron bar 163 attached to the lower support beam 164. Is made of.

The support structure 190 supporting the lower structure 160 prevents inclination toward the inside of the firing furnace 100 when the lower structure 160 rotates, and supports 191 as shown in FIG. 2 for smooth rotation. The bearing 192 is inserted into the upper portion, and the bearing 192 is inserted into the joint 193 attached to the lower side of the lower support beam 164 to smoothly rotate the lower structure 160.

The upper structure 130 fixed by the fixing bar 136 of the kiln and the lower structure 160 installed by the support structure 190 are configured separately from each other, between the upper structure 130 and the lower structure 160 The separation part is shielded with a sealing material to prevent the heat of the kiln from being discharged out.

Spacer portions 165 are formed at both ends in an inner space of the lower structure 160, and the barrier portion 165 is formed with a blocking wall 166 extending downward from the upper structure, and the blockage in the space inside the spaced portion. The wall is located.

Since the blocking wall 166 located in the separation part 165 does not contact each other to prevent heat loss, it is necessary to prevent heat loss of the firing furnace with the sealing material at the separation part, and water is preferably used as the sealing material.

3A is a cross-sectional view showing a combustion device 140 of the firing furnace 100, wherein the combustion device 140 maintains the temperature of the furnace for firing limestone, and into the burner insertion hole 141 into the firing furnace 100. A burner 142 for applying heat, a gas supply pipe 143 for supplying combustion gas to the burner, and an air supply pipe 144 for supplying air.

The combustion device 140 may be attached to the inside or outside of the kiln, or may be attached to the outside, it is preferable to attach to the inside, the outside for maintaining a constant temperature.

Figure 3b is a cross-sectional view showing a gas discharge device 145 for discharging the harmful gas generated in the kiln 100, the gas discharge device 145 is installed on the outer wall of the kiln to form an outlet 146 through the outer wall In addition, the outlet 146 is provided with a suction fan for forcibly discharging the noxious gas. It is discharged to the outside of the kiln 100 through the suction fan, the harmful gas is transferred to the purification apparatus through the hood 147 attached to the discharge device.

4 is a cross-sectional view taken along line B-B of FIG. 1 showing a driving device for rotating the substructure 160 of the kiln 100.

A pinion is attached to a drive shaft 151 connected to the drive motor 150 and an end of the drive shaft 151 to the outside.

The pinion 152 is connected to a rack 153 attached to the lower support beam of the lower stationary 160 to change the rotational motion of the drive motor 150 to the motion of the kiln.

The rack 153 is formed in the circumferential direction of the firing furnace 100 to move the firing furnace 100 as described above.

Figure 5a is a cross-sectional view showing a stirrer 155 is installed to stir the limestone put into the kiln 100, Figure 5b, 5c is a detailed view showing the stirring blades installed in the stirrer.

In the stirrer 155 of the present invention, a rectangular stirring shaft 156 is inserted into the stirrer shaft fixing grooves 159 and 159a formed inside and outside the upper structure of the kiln 100, and the stirring shaft 156 Each one end is fixed with a fixing screw (158).

A plurality of stirring vanes 157 are attached to the stirring shaft 156, and a plurality of agitators 155 are installed to stir well during firing of limestone s, and the stirring wings 157 are crossed. Arrange.

The stirring blade 157 is attached to the stirring shaft 156 is attached to the connecting plate 172 connecting the back and the lower surface of the fixing fixture 171 of the "c" shape, the connecting plate 172 At the bottom of the spatula is a spatula fixing plate 173 for fixing the spatula 170 for stirring.

The spatula 170 is bent downward in front of the limestone to facilitate stirring of the limestone, and is inclined to one side based on the vertical axis.

The stirring blade 157 is inserted into the fixing shaft 156 of the square stirrer shaft 156, and then the fixing screw 175 is fixed to the insertion hole (156a) (171a) formed in the fixing shaft and the fixture.

6 is a cross-sectional view showing the discharge of limestone for the separate process or storage of the limestone calcined in the kiln 100.

Discharge of limestone uses a conveyor 200, and the conveyor 200 is provided with sprockets 207 and 207 'for rotation of the conveyor belt, and is separately provided to the sprocket 207 outside the firing furnace 100. It is driven by the provided drive motor 204.

The scraper 201 is attached to the outside of the conveyor belt 206, and moves the finished limestone to the collecting box 205 provided outside.

The scraper 201 is formed of a support 201a attached to and fixed to a conveyor belt, a scraper spatula 201c scraping limestone, and a support 201b connecting the pedestal 201a and the scraper spatula 201c. .

The scraper spatula 201c has an "L" shape in order to facilitate the collection of limestone, and is preferably inclined to the support 201b.

Both ends of the conveyor 200 are provided with a sprocket on a rotating shaft, and a support shaft 203 is formed inside the firing furnace 100 to support the conveyor 200 to constitute the firing furnace 100 of the present invention.

The method for preparing conidia lime according to the present invention is maintained at 850 ° C. or higher, which is a temperature for firing limestone by the burner 142 provided on the inner wall and the outer wall of the firing furnace 100. At this time, as the temperature inside the furnace, as the temperature is higher, the time required for baking becomes shorter, and the temperature is determined according to the amount of work and the amount of limestone.

When the limestone is supplied to the limestone supply pipe 121 through the limestone supply conveyor from the outside, the limestone is introduced into the guide tube 122 through the limestone supply pipe 121, and the introduced limestone is a preheater of the guide tube 122. 123) first to promote the endothermic reaction.

At the same time as the input of the material, the plate 161 is rotated for firing. At this time, the plate 161 is rotated while the plate 161 is rotated by the driving motor 150 provided outside the firing furnace.

The rotation speed of the flat plate 161 is appropriately adjusted according to the temperature inside the furnace and the amount of limestone, and the limestone placed on the flat plate 161 is changed in its position by the stirring vane 157 installed inside the furnace, thereby calcining the limestone. Let this happen exactly.

The limestone, which is fired while the flat plate 161 is rotated, is transferred to the collecting box 205 by the scraper 201 attached to the conveyor 200 provided in the firing furnace 100, and the firing furnace 100 driven as described above. In the case of calcination of the limestone without stopping the heating of the firing furnace 100 is possible.

The present invention is a continuous method for producing condensed lime for firing and its manufacturing apparatus, the powdered limestone or limestone sludge is processed in a firing furnace is also provided with a powdery limestone raw material which is hardly breathable in the production of powdered lime in the firing furnace After the calcining of limestone is completed by imparting air permeability to the stirrer, and after the calcination of the limestone is finished, the fuel supply is stopped and the product is discharged by opening the product outlet with the burner turned off. Consumption and long time firing time have the effect of shortening the firing time of limestone, increasing the productivity, and improving the firing efficiency by the method for producing continuous conical lime according to the present invention and its manufacturing apparatus.

Claims (3)

A firing furnace 100 having a wall formed of a fireproof insulating material 101, a heat insulating material 102, and an iron shell 103 therein; A screw conveyor 121a for supplying raw materials of the firing furnace 100; A burner 142 inserted into a burner insertion hole 141 of the firing furnace 100 to maintain the temperature of the firing furnace 100; An agitator 155 comprising a stirring shaft 156 fitted to the firing furnace 100 and a stirring blade 157 attached to the stirring shaft 156; On the upper surface of the drive motor 204 provided externally, the sprockets 207 and 207 'connected to the drive motor 204, the conveyor 200 rotated by the sprockets, and the conveyor belt 206 Including the attached scraper 201, Limestone supply pipe 121 through which the raw material is introduced into the firing furnace 100 by the screw conveyor 121a, a limestone guide pipe 122 connected to the limestone supply pipe, and a preheater provided inside the guide pipe 122. A material supply part 120 having a 123 formed thereon; Inner and outer support beams 133 and 134 are connected to upper surfaces of the vertical support beams 131 and 132 formed inside and outside the firing furnace 100, and the inner and outer support beams 133 and 134 are Is connected to the upper connection beam 135, the inner and outer support beams 133, 134 are attached to and fixed to the steel bar 103, the firing furnace fixing bar 136 on the side of the firing furnace 100, the outer side of the firing furnace An upper structure 130; A lower structure 160 made of a flat plate 161 on which external raw materials are placed, a heat insulating material 162 for maintaining an internal temperature, and an iron bar 163 for attaching a lower support beam 164; The firing furnace (150) by the drive motor (150) installed outside the firing furnace (100), the drive shaft (151) and pinion (152) connected to the drive motor (150), and the rack (153) of the substructure (160). A support structure 190 for rotating the substructure 160 of 100; And a gas discharge device 145 for installing a discharge port 146 and a suction fan on the wall of the kiln for discharging the harmful gas generated in the kiln 100. The separation part 165 formed between the blocking wall 166 of the upper structure 130 fixed by the fixing bar 136 and the lower structure 160 installed by the support structure 190 is a sealing material. Conical lime production apparatus, characterized in that the shielding. Promotes endothermic reaction of limestone or limestone sludge by a preheater of a guide tube injecting limestone powder or limestone sludge, The temperature in the kiln is maintained in an atmosphere of 850-1,250 ℃, Limestone powder or limestone sludge having a granular diameter of 4 to 30 mm in the kiln is placed on the flat plate 161 of the kiln, and the rotation speed of the flat plate 161 of the kiln is maintained at 0.5 to 5.0 rph. Manufacturing method. delete

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