Device for reducing water content and powder content of lump ore

Abstract

The utility model relates to a device for reducing the water content and powder content of lump ore, which is characterized in that a chute is arranged below the discharge end of a lump ore conveying belt, a dryer is arranged at the lower part of the chute, and the chute is connected with the dryer in a closed manner; an annular drying net is arranged on the inner side of the dryer, and a plurality of drying holes are formed in the annular drying net; an annular hot air buffering cavity is formed between the inner wall of the dryer and the annular drying net and connected with a hot air inlet pipeline, and a booster fan is arranged on the hot air inlet pipeline. The upper end of the dryer is connected with a dust removal pipeline; a dust remover and an induced draft fan are arranged on the dust removal pipeline; the lower end of the dryer is provided with a discharge port inclining downwards, and the lower portion of the discharge port is provided with a screening device. According to the utility model, the effects of drying lump ores and removing powder adhered to the surface layer can be effectively improved, meanwhile, low-temperature flue gas cooled by a sintering ring can be efficiently utilized, the waste heat recovery rate is improved, and the production cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of steel production, and in particular relates to a device for reducing the water content and powder content of lump ore. Background Art

[0002] In the blast furnace ironmaking process, lump ore is an indispensable main raw material. Unlike sintered ore and pelletized ore, lump ore, as raw material, comes directly from mining and is supplied to the blast furnace after simple crushing and screening. However, lump ore often contains a high moisture content, and a part of powder is easily adhered to its surface. When these lump ores with high moisture and powder content enter the blast furnace, the air permeability inside the blast furnace will be significantly reduced, resulting in an increase in pressure difference, which in turn affects the smooth operation of the blast furnace and the output of molten iron. This is a technical problem that has long plagued the ironmaking industry.

[0003] On the other hand, in the production process of sintered ore, the sintering ring cooler (generally 5 cooling fans) is the key cooling equipment. The temperature of the flue gas after cooling is usually between 100 and 500°C. At present, the high-temperature hot air at the front end of the sintering ring cooler (generally the flue gas generated by the first two cooling fans) is mainly used for power generation, and this part of the energy has been effectively utilized. However, the utilization rate of low-temperature hot air (the flue gas generated by the last three cooling fans) is relatively low, and its utilization effect is not ideal, which not only wastes precious thermal energy resources, but also is not conducive to reducing production costs and recovering waste heat.

[0004] Therefore, how to effectively utilize the low-temperature flue gas generated by the sintering ring cooler and solve the problem of high moisture and powder content in blast furnace lump ore has become a technical problem that needs to be solved urgently in the current ironmaking industry. The present invention comes into being under such a technical background, aiming to provide a new device and method that can reduce the moisture and powder content of lump ore and effectively utilize the low-temperature flue gas of the sintering ring cooler. Utility Model Content

[0005] In view of the problems existing in the prior art, the utility model provides a device which can effectively recover the ring-cooled low-temperature flue gas and reduce the moisture and powder content of the lump ore.

[0006] The utility model is implemented as follows: a device for reducing the moisture and powder content of lump ore, characterized in that: a chute is arranged below the discharge end of the lump ore conveyor belt, a dryer is arranged at the lower part of the chute, and the chute is closed and connected to the dryer; an annular drying net is arranged on the inner side of the dryer, and a plurality of drying holes are arranged on the annular drying net; an annular hot air buffer chamber is formed between the inner wall of the dryer and the annular drying net, the hot air buffer chamber is connected to a hot air inlet duct, and a booster fan is arranged on the hot air inlet duct; the upper end of the dryer is connected to a dust removal duct, and a dust collector and an induced draft fan are arranged on the dust removal duct; the lower end of the dryer is arranged with a discharge port inclined downward, and a sifter is arranged at the lower part of the discharge port.

[0007] Preferably, the angle between the chute and the horizontal plane is 45 to 90 degrees.

[0008] Preferably, an air volume regulating valve and a flow meter are installed on the hot air inlet duct.

[0009] Preferably, a pressure gauge is installed on the air outlet duct of the booster fan.

[0010] The utility model has the advantages and technical effects: the utility model utilizes the flowing lump ore and the injected flue gas to form a hedge, thereby improving the effect of lump ore drying and the removal of surface adhering powder, and at the same time can effectively utilize the low-temperature flue gas of the sintering ring cooling, improve the waste heat recovery rate, and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model.

[0012] In the figure, 1. conveyor belt; 2. chute; 3. dryer; 4. ring drying net; 5. hot air inlet duct; 6. air volume regulating valve; 7. flow meter; 8. booster fan; 9. pressure gauge; 10. vibrating screen; 11. dust removal duct; 12. dust collector; 13. induced draft fan. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0014] See also Figure 1, a device for reducing the moisture and powder content of lump ore, a chute 2 is arranged below the discharging end of the lump ore conveying belt 1, and the lump ore conveying belt can effectively and continuously transport the lump ore from one place to another, thereby improving work efficiency. The chute plays a role in guiding the flow of the lump ore, and its design enables the lump ore to enter the dryer smoothly, thereby avoiding the scattering and waste of the lump ore during the transportation process; the lower part of the chute 2 is closedly connected to the dryer 3, and the closed connection can prevent heat loss and dust diffusion, thereby improving energy efficiency and the safety of the working environment; an annular drying net 4 is arranged inside the dryer 3, and a plurality of drying holes are arranged on the annular drying net 4, and the size of the plurality of drying holes arranged on the annular drying net is 1 to 5 mm, and the design of the annular drying net increases the contact area between the lump ore and the hot air, thereby improving the drying efficiency. The drying holes ensure that the hot air can pass through the drying net evenly, so as to dry the lump ore comprehensively and evenly; the lower part of the annular drying net 4 is connected with the hot air inlet duct 5. Preferably, the hot air inlet duct 5 is introduced into the ring-cooled low-temperature hot air (the flue gas generated by the last three cooling fans). By introducing hot air of suitable temperature into the dryer, the moisture in the lump ore can be effectively removed, and at the same time, the quality of the lump ore can be damaged due to excessive temperature. A booster fan 8 is provided on the hot air inlet duct 5, which can increase the hot air pressure and air volume entering the dryer, ensuring that the hot air can pass through the drying net evenly and powerfully, further improving the drying effect; the upper end of the dryer 3 is connected to a dust removal duct 11, and a dust collector 12 and an induced draft fan 13 are arranged on the dust removal duct 11; the lower end of the dryer 3 is arranged with an inclined discharge port, and a sifter 10 is provided at the lower part of the discharge port, and the sieve hole of the sifter is less than or equal to 5mm; the sifter can screen the dried lump ore, remove fine particles and dust therein, and further improve the purity and quality of the product.

[0015] Preferably, the angle between the chute 2 and the horizontal plane is 45-90°. The appropriate angle design can ensure that the lump ore slides smoothly into the dryer under the action of gravity, reducing the possibility of blockage and retention and improving the overall work efficiency.

[0016] Preferably, an air volume regulating valve 6 and a flow meter 7 are installed on the hot air inlet duct 5. The air volume regulating valve can flexibly adjust the hot air volume entering the dryer to meet different drying requirements. The flow meter is used to monitor the hot air flow in real time to ensure the controllability and stability of the drying process.

[0017] Preferably, a pressure gauge 9 is installed on the air outlet duct of the booster fan 8, and the pressure gauge is used to monitor the pressure of the air outlet duct of the booster fan in real time, so as to help the operator understand the working status of the system and ensure the safe operation of the equipment.

[0018] The utility model has the advantages and technical effects: the utility model utilizes the flowing lump ore and the injected flue gas to form a hedge, thereby improving the effect of lump ore drying and the removal of surface adhering powder, and at the same time can effectively utilize the low-temperature flue gas of the sintering ring cooling, improve the waste heat recovery rate, and reduce production costs.

[0019] The use of this utility model:

[0020] 1. Turn on the booster fan, induced draft fan, dust collector and screener, and adjust the flow control valve on the hot air inlet duct, the pressure of the booster fan and the lump ore flow of the loose belt.

[0021] 2. The lump ore enters the dryer through the conveyor belt and chute, and forms a hedge with the hot air ejected from the annular drying net. Under the action of the hot air, the moisture and dust adhering to the surface of the lump ore are removed, and under the action of gravity, the lump ore enters the screener through the discharge port at the bottom of the dryer to complete screening, and then is supplied to the blast furnace for use.

[0022] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for reducing the moisture and powder content of lump ore, characterized in that: A chute is arranged below the discharge end of the lump ore conveyor belt, a dryer is provided at the lower part of the chute, and the chute is closed and connected to the dryer; an annular drying net is arranged on the inner side of the dryer, and a plurality of drying holes are provided on the annular drying net; an annular hot air buffer chamber is formed between the inner wall of the dryer and the annular drying net, and the hot air buffer chamber is connected to a hot air inlet duct, and a booster fan is provided on the hot air inlet duct; a dust removal duct is connected to the upper end of the dryer, and a dust collector and an induced draft fan are arranged on the dust removal duct; a discharge port inclined downward is arranged at the lower end of the dryer, and a screener is provided at the lower part of the discharge port.

2. The device for reducing the moisture and powder content of lump ore according to claim 1, characterized in that: The angle between the chute and the horizontal plane is 45 to 90 degrees.

3. The device for reducing the moisture and powder content of lump ore according to claim 1, characterized in that: An air volume regulating valve and a flow meter are installed on the hot air inlet duct.

4. The device for reducing the moisture and powder content of lump ore according to claim 1, characterized in that: A pressure gauge is installed on the air outlet duct of the booster fan.

5. The device for reducing the moisture and powder content of lump ore according to claim 1, characterized in that: The annular drying net is provided with a plurality of drying holes with a size of 1 to 5 mm.

6. The device for reducing the moisture and powder content of lump ore according to claim 1, characterized in that: The sieve hole of the screener is less than or equal to 5mm.

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