KR101377629B1 - Sintering apparatus and controlling method thereof - Google Patents

Abstract

A sintering machine and a control method thereof are disclosed. According to an embodiment of the invention, the sintering machine body; An exhaust gas pipe through which exhaust gas generated in the sintering body is discharged; A heat exchanger disposed in the exhaust gas pipe; A supply pipe installed to pass through the heat exchanger and supplying fuel and air heat-exchanged in the heat exchanger to an upper side of the sintering body; And a distributor connected to the supply pipe and disposed above the main body of the sinterer to inject fuel and air heat-exchanged to the sintering trolley.

Description

Sintering machine and its control method {SINTERING APPARATUS AND CONTROLLING METHOD THEREOF}

The present invention relates to a sintering machine capable of recovering thermal energy generated in the sintering process and a control method thereof.

In general, the sintering step is a process for producing a sintered ore by agglomerating the raw material of the fine powder. A large number of sintered trucks are transported to the sintering machine body. Inside the sintered lorry, raw materials mixed with iron ore and additives are charged. The blended raw material is sintered by ignition at high temperatures in the ignition furnace during the movement of the sinter bogie. Flue gas is generated when the blended raw material is sintered. The exhaust gas is discharged to the exhaust gas treatment facility by the exhaust gas pipe disposed in the sintering body. The flue gas treated in the flue gas treatment plant is discharged to the atmosphere. Since hot exhaust gases are released into the atmosphere, thermal energy may be wasted.

Korean Unexamined Patent Publication No. 10-2003-0041720 (published May 27, 2003) discloses a supply control device for the upper light particle size for producing sintered ores. The supply control device for the upper light particle size can load the upper light used for producing the sintered ores by classifying the particle size.

Embodiments of the present invention, to provide a sintering machine and a control method for recovering the heat energy generated in the sintering process.

According to one aspect of the invention, the sintering machine body; An exhaust gas pipe through which exhaust gas generated in the sintering body is discharged; A heat exchanger disposed in the exhaust gas pipe; A supply pipe installed to pass through the heat exchanger and supplying fuel and air heat-exchanged in the heat exchanger to an upper side of the sintering body; And a distributor connected to the supply pipe and disposed above the main body of the sinterer to inject fuel and air heat-exchanged to the sintering trolley.

The supply pipe, the air pipe through which the air flows; And a fuel pipe through which the fuel flows.

The air pipe and the fuel pipe may further include a valve.

The distributor may include a distribution pipe connected to the air pipe and the fuel pipe; A hood disposed to cover an upper side of the sinterer body; And a plurality of branch pipes branched from the distribution pipe and connected to the hood.

The air pipe and the fuel pipe may be connected by a plurality of distribution pipes.

A temperature sensing unit disposed in the exhaust gas pipe; And a controller for stopping supply of fuel and air to the supply pipe when it is determined that the temperature measured by the temperature sensor is equal to or less than a preset temperature.

According to another aspect of the invention, the step of supplying the fuel and air heat-exchanged in the heat exchanger to the sinter bogie; Measuring the temperature of the exhaust gas of the exhaust gas pipe; And if it is determined that the temperature of the exhaust gas is less than the predetermined temperature, it provides a control method of the sintering machine comprising the step of stopping the supply of tar and air to the supply pipe.

According to embodiments of the present invention, there is an effect that can recover the heat energy generated in the sintering process.

1 is a block diagram showing a sintering machine according to the present invention.
FIG. 2 is a perspective view of the distributor of FIG. 1. FIG.
3 is a side view of the distributor of FIG. 2.
4 is a flow chart showing a control method of the sintering machine according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

Hereinafter, an embodiment of the sintering machine according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a sintering machine according to the present invention.

Referring to FIG. 1, the sinterer may include a sinterer body 110, an exhaust gas pipe 120, a heat exchanger 130, a supply pipe 140, and a distributor 170.

An upper light hopper 10, a surge hopper 20, and an igniter 30 may be disposed on an upper side of one side of the sintering body 110. The upper light hopper 10 and the surge hopper 20 provide the upper light and the blended raw material to the sintered cart (not shown). The blended raw materials are those obtained by mixing minute iron ore, coke and limestone at a certain ratio.

The sintering machine body 110 may include a sprocket 111 so that a plurality of sintered trucks are transported in an infinite track. The sprockets 111 may be disposed at both sides of the sinterer body 110 to transfer the track 113 of the sinterer body 110 to the infinite track. Multiple sintered bogies may be disposed on the track 113 and transported in a caterpillar track.

A crusher 40 for crushing the sintered ore discharged from the sintering cart may be disposed below the other side of the sintering machine body 110. A cooler 50 for cooling the sintered ores may be disposed in the lower portion of the crusher 40.

A communication hole (not shown) may be formed by overlapping a plurality of great bars (not shown) in the lower portion of the sintered trolley. At this time, a plurality of great bars (not shown) may be arranged in a stacked structure in a state of standing up and down.

A plurality of wind boxes 115 may be disposed below the sintered trolley. The plurality of wind boxes 115 are connected to the lower side of the communication hole so that the flue gas generated in the sinter bogie flows in.

The exhaust gas pipe 120 may be connected to the wind box 115 to flow the exhaust gas generated in the sinterer body 110. The exhaust gas pipe 120 may be about 130-150 ° C exhaust gas flow.

The exhaust gas pipe 120 may be connected to the exhaust gas processor 123. In the flue gas processor 123, the flue gas is filtered. The flue gas processor 123 may be connected to the stack 127. The stack 127 can discharge the air filtered by the flue gas processor 123 into the atmosphere.

A blower 125 may be disposed between the stack 127 and the flue gas processor 123. The blower 125 sucks in air to form a suction pressure in the exhaust gas pipe 120 and the wind box 115. When the suction pressure is formed in the exhaust gas pipe 120 and the wind box 115, an air flow is generated from the upper side to the lower side of the sinter bogie. Therefore, the blending raw material of the sintered trolley advances from the upper side to the lower side.

The heat exchanger 130 may be disposed in the exhaust gas pipe 120. The heat exchanger 130 may be in communication with the exhaust gas pipe 120 and heated by the exhaust gas flowing along the exhaust gas pipe 120. A heat exchange fin (not shown) may be formed in the heat exchanger 130 to increase the thermal contact area with the exhaust gas.

The supply pipe 140 may be installed to pass through the heat exchanger 130. The supply pipe 140 may supply the fuel and air heat-exchanged in the heat exchanger 130 to the upper side of the sinterer body 110. Here, tar or waste oil may be applied as the fuel.

The supply pipe 140 may include an air pipe 141 through which air flows, and a fuel pipe 145 through which fuel flows. The air pipe 141 and the fuel pipe 145 may include heat exchange pipe parts 142 and 146 having a zigzag shape or a spiral wound shape so as to be in thermal contact with the heat exchanger 130. Each heat exchange pipe 142 and 146 may increase the time and heat exchange area when air and fuel are heat exchanged with the heat exchanger 130.

The air pipe 141 may be connected to the air supply device 155, and the fuel pipe 145 may be connected to the fuel supply device 157. Valves 151 and 153 may be installed in the air pipe 141 and the fuel pipe 145 to open or close the flow path or adjust the opening degree of the flow path. The valves 151 and 153 may be disposed upstream of the heat exchanger 130.

In addition, the supply pipe 140 may be one pipe flowing in a state where air and fuel are mixed. When the supply pipe 140 is formed of one pipe, the mixture supply device may be connected to the supply pipe.

The exhaust gas pipe 120 may further include a temperature sensor 163. The temperature sensing unit 163 may be disposed inside and outside the exhaust gas pipe 120 to detect a temperature of the exhaust gas flowing in the exhaust gas pipe 120.

The controller 160 may be further included to be electrically connected to the temperature sensor 163. If it is determined that the temperature measured by the temperature sensor 163 is less than or equal to the preset temperature, the controller 160 may stop the supply of fuel and air to the supply pipe 140. Here, the preset temperature may be approximately 120-130 ° C.

The controller 160 may open and close the valves 151 and 153 of the air pipe 141 and the fuel pipe 145 according to the temperature measured by the temperature sensor 163. Accordingly, the sintered trolley can be provided with air and fuel at a constant temperature and control the efficiency of the heat exchanger 130.

The distributor 170 may be disposed above the sinterer body 110. The distributor 170 may be connected to the supply pipe 140.

2 is a perspective view of the distributor, and FIG. 3 is a side view of the distributor.

2 and 3, the distributor 170 may include a distribution pipe 171, a hood 173, and a plurality of branch pipes 175.

The distribution pipe 171 may be connected to the air pipe 141 and the fuel pipe 145. A plurality of distribution pipes 171 may be disposed between the air pipe 141 and the fuel pipe 145. In this case, the distribution pipe 171 may be vertically connected to the air pipe 141 and the fuel pipe 145. Air and fuel flow into the distribution pipe 171 together. Therefore, air and fuel may be mixed in the distribution pipe 171.

The hood 173 may be disposed to cover the upper side of the sinterer body 110. At this time, the hood 173 may entirely cover the upper side of the sintered trolley. Both sides of the hood 173 may be formed bent portion bent downward. The bent portion can prevent the air and fuel injected into the sinter bogie from leaking out of the sinter bogie. The hood 173 may be formed in a rectangular plate shape as a whole.

The plurality of branch pipes 175 may be branched from the distribution pipe 171 and connected to the hood 173. Branch pipes 175 may extend to the lower side of the distribution pipe (171). These branch tubes 175 may support the hood 173 such that the hood 173 is located above the sinterer body 110.

A plurality of injection nozzles 177 may be disposed on the bottom surface of the hood 173 to communicate with the plurality of branch pipes 175. The injection nozzle 177 may allow the mixed gas mixed with air and fuel to be injected above the sintered trolley.

Air and fuel are heated to a high temperature in the heat exchanger 130 and then injected into the blended raw material of the sintered bogie, it is possible to significantly reduce the amount of energy used in the sintering process.

In addition, by supplying tar or waste oil to the blended raw material of the sintered trolley, the combustion efficiency of oxygen contained in the sintered ore can be increased. Therefore, since the reducibility of the sintered ore can be increased, the quality of the sintered ore can be improved.

In addition, since hot air and combustion heat are injected into the blended raw material, the temperature of the blended raw material can reach the sintering temperature in a short time. Therefore, the reduction efficiency of the sintered ore can be improved and the quality of the sintered ore can be improved.

In addition, since the exhaust gas is cooled in the heat exchanger 130, the exhaust gas processor 123 is supplied with a relatively low temperature exhaust gas. Therefore, even if a flammable substance adheres to the dust collecting plate of the exhaust gas processing unit 123, it is possible to prevent local ignition from occurring in the dust collecting plate by the hot exhaust gas. Therefore, the life of the flue gas processor 123 can be extended and maintenance and repair costs can be reduced.

It will be described with respect to the control method of the sintering machine according to the present invention configured as described above.

4 is a flow chart showing a control method of the sintering machine according to the present invention.

Referring to FIG. 4, the upper light hopper 10 and the surge hopper 20 provide a blended raw material to the sintered bogie. The sprocket 111 can transfer the sintered trolley to the endless track. While the sintered bogie passes the lower part of the igniter 30, the blended raw material of the sintered bogie can be ignited. At this time, the upper portion of the blended raw material may be complexed to about 1200 ℃.

When the blower 125 is driven, the pressure is lowered to the wind box 115 and the exhaust gas pipe 120. Therefore, the blending raw material of the sintered trolley advances from the upper side to the lower side by the suction pressure of the blower 125.

While the sintered trolley is transferred to the crusher 40 side, the blending raw material of the sintered trolley is sintered (S11). When the sintered trolley reaches the sprocket 111 on the crusher 40 side, the blended raw material of the sintered trolley becomes a sintered ore which is a red lump. The sintered trolley is rotated by the sprocket 111 and the sintered ore of the sintered trolley is discharged to the crusher 40. The crusher 40 crushes the sintered ore and provides it to the cooler 50. The cooler 50 cools the sintered ore crushed.

The sintered bogie from which the sintered ore is discharged is transferred back to the upper light hopper 10 along the track 113 of the sintering machine. As the sintered truck is transported in the caterpillar, the sintered ore is continuously manufactured in the sintering machine.

Flue gas may be generated during the production of sintered ore in the sinter bogie. At this time, as the blower 125 is driven, the suction pressure is formed in the wind box 115 and the exhaust gas pipe 120. Therefore, the exhaust gas generated in the sintered trolley is discharged to the wind box 115 and the exhaust gas pipe 120 (S12).

The exhaust gas of the exhaust gas pipe 120 is supplied to the heat exchanger 130. The heat exchanger 130 allows the air of the air pipe 141 and the fuel of the fuel pipe 145 to exchange heat with the exhaust gas. Therefore, part of the thermal energy of the exhaust gas is recovered.

The exhaust gas relatively cooled in the heat exchanger 130 is supplied to the exhaust gas processor 123. At this time, since the exhaust gas is cooled in the heat exchanger 130, the exhaust gas processor 123 is supplied with a relatively low temperature exhaust gas. Therefore, even if a flammable substance adheres to the dust collecting plate of the exhaust gas processing unit 123, it is possible to prevent local ignition from occurring in the dust collecting plate by the hot exhaust gas. Therefore, the life of the flue gas processor 123 can be extended and maintenance and repair costs can be reduced.

The exhaust gas may be filtered through the exhaust gas processor 123 and then discharged into the atmosphere through the stack 127.

Air and fuel heated in the heat exchanger 130 are supplied to the distributor 170. Air heated to a high temperature and fuel are mixed in the distribution pipe 171. The mixed gas of the distribution pipe 171 flows into the branch pipe 175, and the mixed gas of the branch pipe 175 is injected into the blended raw material of the sinter bogie by the injection nozzle 177.

Since the blended raw material improves combustion efficiency as hot air and fuel are injected, the quality of the sintered ore can be improved by increasing the reducibility of the sintered ore.

In addition, since the air and the fuel are heated to high temperature by the thermal energy of the exhaust gas, the amount of energy used in the sintering process can be significantly reduced.

In addition, since hot air and combustion heat are injected into the blended raw material, the temperature of the blended raw material can reach the sintering temperature in a short time. Therefore, the reduction efficiency of the sintered ore can be improved and the quality of the sintered ore can be improved.

During the process of manufacturing the sintered ore as described above, the temperature sensor 163 detects the temperature of the exhaust gas and transmits a signal regarding the temperature to the controller 160.

The controller 160 determines whether the temperature of the exhaust gas is lower than or equal to the preset temperature (S14).

When it is determined that the exhaust gas temperature exceeds the preset temperature, air and fuel may be continuously supplied to the air pipe 141 and the fuel pipe 145.

When it is determined that the exhaust gas temperature is less than or equal to the preset temperature, the controller 160 stops supply of air and fuel to the air pipe 141 and the fuel pipe 145 (S15). At this time, the controller 160 closes the valves 151 and 153. Therefore, since the air and the fuel of a predetermined temperature or more are provided in the sintered trolley, the heat exchange efficiency of the heat exchanger 130 can be controlled.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit of the invention as set forth in the appended claims. The present invention can be variously modified and changed by those skilled in the art, and it is also within the scope of the present invention.

110: sintering machine body 115: wind box
120: exhaust gas pipe 123: exhaust gas handler
125: blower 130: heat exchanger
140: supply piping 141: air piping
145: fuel piping 151, 153: valve
160: control unit 163: temperature detection unit
170: distributor 171: distribution tube
173: hood 175: branch pipe
177: spray nozzle

Claims (7)

delete delete delete delete delete delete Supplying the fuel and air heat-exchanged in the heat exchanger to the sinter bogie;
Measuring the temperature of the exhaust gas of the exhaust gas pipe; And
If it is determined that the temperature of the exhaust gas is equal to or less than a preset temperature, controlling the supply of tar and air to the supply pipe.

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