KR20030053695A - Dust recycling apparatus of electric precipitator in sinter cake plant - Google Patents

Abstract

The present invention relates to an electrostatic precipitator dust recycling apparatus in a sintered ore facility,

After the raw material and the sub-raw material cut out from the raw material storage bin 100 and the semi-glossy generated in the blast furnace and the sintering process are cut out at a constant ratio, water is added in the first and second drum mixers 111 and 112 to perform mixing and granulation. It is charged into the sintering machine cart 120 through the surge hopper 113 and formed into a sintered body by the ignition furnace, and is sorted by each size through the crusher and the cooler 140 through the characteristic sorter 150, 151, 152 and transferred to the subsequent process. However, in a conventional sintered ore facility having an electrostatic precipitator 180 and a pressure feeding system 170 for collecting and pumping dust generated during cooling and sorting of the sintered compact, the dust pumped at high pressure through the pressure feeding system 170. A mixed water tank 201 having a decompression tank 202 for supplying the depressurized water to the upper portion and having a supply water pipe 207 for supplying fresh water; A stirrer 203 for mixing the dust in the mixing tank 201 with fresh water to form mixed water; Upper and lower levelers 204 and 205 for sensing the level of the mixing tank 201 to adjust the supply of dust and fresh water through the pressure feeding system 170 and the supply water pipe 207; A circulation pump 206 for circulating the mixed water to prevent dust settling under the mixed water tank 201; Characterized in that it comprises a mixed water pump 209 for supplying the mixed water in the mixing tank 201 to the first and second drum mixers (111, 112),

It provides an effect of preventing environmental pollution by dust scattering and preventing sintered ore quality fluctuations, thereby increasing the production and productivity of high-quality sintered ore.

Description

DUST RECYCLING APPARATUS OF ELECTRIC PRECIPITATOR IN SINTER CAKE PLANT}

The present invention relates to an electrostatic precipitator dust recycling apparatus in a sintered ore plant, and more particularly, the electrostatic precipitator dust is pumped into a mixing tank with a level control, mixed together with fresh water, and fed together as a mixed raw material addition water, The present invention relates to an electrostatic precipitator dust recycling apparatus for preventing environmental pollution and preventing sintered ore quality fluctuation, thereby increasing the production and productivity of high-quality sintered ore.

1 is a schematic diagram illustrating a general sintered ore manufacturing process, Figure 2 is a schematic diagram showing a conventional electrostatic precipitator dust recycling process.

In the general sintered ore manufacturing equipment as shown in Figure 1, in order to produce a sintered ore of particles suitable for use in the blast furnace, powdered ore of less than 8mm and the raw materials such as limestone, silica, serpentine, quicklime, etc. Then, the semi-glosses generated in the blast furnace and the sintering process are cut out at a constant ratio, and water is added in the first and second drum mixers 111 and 112 to perform mixing and granulation, and then charged into the surge hopper 113.

The sintered raw material (hereinafter referred to as ROW MATERIAL) charged in the surge hopper 113 is charged to a certain height in the sintering machine bogie 120 using the drum-type cutting machine 115, and immediately high temperature (1200 ° C). In the ignition furnace of), the surface layer is ignited.

The sintering machine bogie 120 is configured to repeatedly proceed inverted on the rail by a large sprocket wheel (121a, 121b) installed on the longitudinal, driving side in close contact with a plurality of units, the progress of the sintering machine bogie 120 There is a sealed box 122 to block the inflow of external air in the lower part of the cart to facilitate the suction in the process, the air is introduced only from the upper portion of the blended raw material loaded in the cart, the temperature rises to 1300 ~ 1400 ℃ by coke combustion, the sintered body (SINTER CAKE) is formed.

The sintered compact is sorted in the range of 5-50mm through the crusher and the cooler 140 through the characteristic 1,2, tertiary sorter (SCREEN) 150, 151, and 152 for screening the particle size of the sintered body, and the selected sintered ore is sent to the blast furnace. Some of the sintered ore sintered in the Sungpul secondary sorter 151 is the upper light hopper 114, the -5mm sintered ore sorted in the tertiary sorter 152 is recovered to the self-reflecting bin 101 and quantified again as a blending material It will be cut off.

At this time, the fine dust (DUST) generated by the high-temperature sintered body after cooling and sorting is collected through an electrostatic precipitator (EP), and the collected dust is self-reflecting bin (through a pressure feeding system 170). 101).

In the continuous sintering process as described above, the greatest influence on the sintered ore productivity is the air permeability in the sintered charge raw material layer, and the air in the atmosphere is absorbed from the lower portion by the pressure of the blended raw material layer in the sinterer truck 120 (usually 650 to 650). The sintering productivity depends on how smoothly it passes through 680mm).

By the way, when the dust of the fine powder which was irregularly transported during the cutting process of the compounding material is temporarily cut out through the self-reflecting bin 101, it adversely affects the air permeability in the raw material layer, thereby deteriorating the quality and increasing productivity.

Therefore, in case of deterioration of air permeability such as rising of negative pressure and falling of temperature curve in sinter bed, the driver takes measures such as decrease of sintering machine speed, and in case of such severe situation, stops the equipment and performs bed suction. Take measures to increase added moisture.

However, there is a limitation that the above operation method is only a temporary method in the sintering operation that varies according to various conditions, and it is impossible to predict the situation before the situation is discovered in advance, so only the follow-up action is possible. Problems such as unavoidable sintered ore quality deterioration and productivity decrease by methods such as speed reduction and stoppage, and environmental pollution generated when dust cutting of fine powder in the field still remain.

The present invention has been made in view of the above problems, by feeding the dust of the fine powder collected in the electrostatic precipitator to the mixing tank capable of level control, mixed with fresh water and supplied to the mixed raw material addition water, the environment by dust scattering It is an object of the present invention to provide an electrostatic precipitator dust recycling apparatus in a sintered ore plant which can prevent pollution and prevent sintered ore quality fluctuation to produce high quality sintered ore and increase productivity.

1 is a schematic diagram illustrating a general sintered ore manufacturing process,

2 is a schematic diagram showing a conventional electrostatic precipitator dust recycling process,

3 is a schematic configuration diagram of an electrostatic precipitator dust recycling apparatus according to the present invention,

Figure 4 is a flow chart of the operation of the dust collector dust recycling apparatus according to the present invention.

<Description of Symbols for Main Parts of Drawings>

100: raw material storage bin 101: self-reflective bin

102: self-reflective continuous cutting machine 103: compound feed belt conveyor

110: Pond 111: Primary Drum Mixer

112: secondary drum mixer 113: surge hopper

114: upper light hopper 115: drum-type cutting machine

120: sintering machine cart 121a, b: sprocket wheel

122: sealed box 130: main blower

140: cooler 150, 151, 152: character 1,2, tertiary sorter

153: upper light feeder 160: blast furnace empty

180: electrostatic precipitator (E.P) 201: mixing tank

202: pressure reduction tank 203: stirrer

204: MAX leveler 205: MIN leveler

206: circulation pump 207: supply water piping

208: pressure feed pipe 209: mixed water pump

210a: primary mixer injector 210b: secondary mixer injector

The present invention for achieving the above object, by cutting the raw material and the sub-raw material cut out from the raw material storage bin 100 and the semi-light generated in the blast furnace and the sintering process at a constant ratio, the first and second drum mixers (111, 112) After mixing and assembling by adding water, the mixture is charged into the sinter mill bogie 120 through the surge hopper 113, and formed into a sintered body by an ignition furnace, and is passed through the crusher and the cooler 140, and then the character sorter 150, 151, 152. In the conventional sintered ore facility equipped with an electrostatic precipitator 180 and a pressure feeding system 170 for collecting and transporting the dust generated during cooling and sorting of the sintered compact by sorting by size for each step through A mixing water tank 201 having a decompression tank 202 configured to reduce pressure of the dust fed at high pressure through the pressure feeding system 170 and supplied thereon and connected to a supply water pipe 207 for supplying fresh water; A stirrer 203 for mixing the dust in the mixing tank 201 with fresh water to form mixed water; Upper and lower levelers 204 and 205 for sensing the level of the mixing tank 201 to adjust the supply of dust and fresh water through the pressure feeding system 170 and the supply water pipe 207; A circulation pump 206 for circulating the mixed water to prevent dust settling under the mixed water tank 201; It characterized in that it comprises a mixed water pump 209 for supplying the mixed water in the mixing tank 201 to the first and second drum mixers (111, 112).

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

3 is a schematic configuration diagram of an electrostatic precipitator dust recycling apparatus according to the present invention, Figure 4 is an operation flowchart of the electrostatic precipitator dust recycling apparatus according to the present invention.

The dust of the fine powder collected by the electrostatic precipitator 180 is conveyed through the pressure feed pipe 208 by the pressure feed system 170, and the pressure reduction tank 202 for reducing the pressure is mixed at the end of the pressure feed pipe 208. Connected to the upper portion of the water tank 201, the dust that is pressurized at a high pressure (approximately 4 ~ 6kg / ㎠) is to reduce the pressure in the mixing tank 201 to facilitate the bath.

The upper side of the mixing tank 201 is connected to the supply water pipe 207 for supplying fresh water, the dust and the fresh water supplied in the mixing tank 201 is mixed to form a mixed water, water In order to facilitate mixing of dust and dust, an agitator 203 equipped with a multi-stage screw 203a is installed and operated by a motor.

On the other hand, the amount of mixed water in the mixing tank 201 can be controlled by the level detection and control by the upper and lower limit levelers (MAX., MIN. LEVELER) 204, 205, the level of the mixing tank 201 is lower limit In the case of detecting the pressure of the feed system 170 and the supply water line to the operation signal to the mixed water of the mixing tank 201 to replenish, if the upper limit is detected the pressure of the feed system 170 and the supply water line Send a signal to stop operation to stop the supply of dust and fresh water.

The start or stop signal is configured to be transmitted from a control unit (not shown) of a facility receiving the upper and lower limit levelers 204 and 205 or a local panel (not shown) separately installed for such control.

As the level of the mixing tank 201 is adjusted, the mixed water is agitated, and the continuous mixing water is operated by operating a circulation pump 206 installed in a pipe connected to the lower side of the mixing tank bottom side to prevent precipitation of the lower portion of the mixing tank 201. Let the circulation work of.

The mixed water mixed in the mixing tank 201 by the above operation is injected into the first and second drum mixers 111 and 112 through the operation of the mixed water pump 209.

Through such a configuration, the air permeability of the blended raw material is extremely deteriorated during the sintering firing process because a large amount of dust is discharged at once by being divided into a fine dust layer 101a and a semi-glossy layer 101b inside the self-reflecting bin 101. The problem of the conventional equipment, which could not but be solved, can be solved.

The dust collector of the electrostatic precipitator in the sintering ore plant of the present invention uses the mixed water mixed with dust and fresh water through the mixing tank as the additive water of the blended raw material, thereby improving the sintering operation and improving the productivity. It also contributes to practically contribute to environmental improvement by solving scattering dust generated during dust discharge.

Claims (1)

After the raw material and the sub-raw material cut out from the raw material storage bin 100 and the semi-glossy generated in the blast furnace and the sintering process are cut out at a constant ratio, water is added in the first and second drum mixers 111 and 112 to perform mixing and granulation. It is charged into the sintering machine cart 120 through the surge hopper 113 and formed into a sintered body by the ignition furnace, and is sorted by each size through the crusher and the cooler 140 through the characteristic sorter 150, 151, 152 and transferred to the subsequent process. In the conventional sintered ore equipment provided with an electrostatic precipitator 180 and a pressure feeding system 170 for collecting and feeding dust generated during cooling and sorting of the sintered compact, A mixing water tank 201 having a decompression tank 202 configured to reduce pressure of the dust fed at high pressure through the pressure feeding system 170 and supplied thereon and connected to a supply water pipe 207 for supplying fresh water; A stirrer 203 for mixing the dust in the mixing tank 201 with fresh water to form mixed water; Upper and lower levelers 204 and 205 for sensing the level of the mixing tank 201 to adjust the supply of dust and fresh water through the pressure feeding system 170 and the supply water pipe 207; A circulation pump 206 for circulating the mixed water to prevent dust settling under the mixed water tank 201; Electrostatic precipitator dust recycling apparatus in the sintered ore equipment, characterized in that it comprises a mixed water pump (209) for supplying the mixed water in the mixing tank (201) to the first and second drum mixers (111, 112).