CN115872183A

CN115872183A - Fine powder fine separation device, system and method for preparing sintering fuel in fixed scale mode

Info

Publication number: CN115872183A
Application number: CN202111138958.3A
Authority: CN
Inventors: 刘克俭; 戴波; 卢兴福
Original assignee: Zhongye Changtian International Engineering Co Ltd
Current assignee: Zhongye Changtian International Engineering Co Ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2023-03-31
Anticipated expiration: 2041-09-27
Also published as: CN115872183B

Abstract

A fine powder fine separation device comprises a fine separation chamber, an air draft cover and a finished product hopper; a partition plate is arranged in the fine separation chamber; the fine separation chamber is divided into an upper chamber and a lower chamber by the partition plate; the draught hood is arranged at the top of the upper chamber; the finished product hopper is arranged at the bottom of the lower chamber; a feed inlet is formed in the side part of the lower chamber; the top of the air draft cover is provided with an air draft opening; a reciprocal cyclone separator is also arranged in the fine separation chamber; the upper end of the reciprocal cyclone separator penetrates through the partition plate and the lower end of the reciprocal cyclone separator penetrates through the bottom plate of the lower chamber; the lower part of the reciprocal cyclone separator is provided with a cyclone inlet; the rotary inlet is communicated with the lower chamber; the top or the upper part of the side wall of the reciprocal cyclone separator is provided with a cyclone outlet. The invention can realize the separation of small-particle materials and large-particle materials, solves the problem of the influence of fine powder in fuel on the sintering process, improves the combustion efficiency and the utilization rate of the fuel, reduces the solid fuel consumption in the sintering process, improves the air permeability of a sinter bed, reduces the carbon emission and improves the yield.

Description

Fine powder fine separation device, system and method for preparing sintering fuel in fixed scale mode

Technical Field

The invention relates to a technology for controlling the granularity of sintering fuel, in particular to a fine powder fine separation device, a system for preparing sintering fuel in a fixed scale and a method thereof, and belongs to the technical field of sintering production.

Background

In addition to ignition, the heat of the sintering process is mainly provided by solid fuels. The sintering process has a high requirement on the particle size of the fuel coal, and is usually within the range of 0.5-3 mm or 1-3 mm. If the particle size of the solid fuel is too large, this may result in: 1) The combustion zone is widened, fuel is unevenly distributed in a material layer to influence ignition, the fuel is excessively melted around large-particle fuel, and materials at a position far away from the fuel particles cannot be well sintered; 2) The reducing atmosphere around the coarse fuel is strong, and the air in the fuel-free place cannot be utilized; 3) The material distribution is easy to generate fuel segregation, large-particle fuel is concentrated at the lower part of the material layer, and the temperature difference of the sintering material layer is larger due to the heat storage function of the sintering material layer, so that the strength of the upper-layer sintering ore is poor, the lower layer is over-melted, and the content of FeO is higher. If the particle size of the solid fuel is too small, this results in: 1) High sintering speed and high combustion ratio (CO) ₂ + C =2 CO), on the one hand, the heat generated by combustion is difficult to make the sintering material reach the required high temperature, so that the strength of the sintering ore is reduced, and on the other hand, the concentration of CO pollutants in the sintering flue gas is higher;

2) The fine particle fuel increases the resistance of a sinter bed, so that the air permeability of the sinter bed is deteriorated, and the sintering process is greatly influenced; 3) Too fine coal powder can also be directly taken away by airflow at the ignition section, so that the utilization efficiency of carbon is poor, and fuel waste is caused.

Typically, the fuel coal needs to be crushed before it is added to the blend. The coarse grain fuel coal can be controlled by adjusting the parameters of the crusher, but the fine grain fuel coal (the grain size is less than or equal to 0.5 mm) can not be well regulated and controlled so far. Therefore, the pulverized fuel coal fine powder with the proportion of less than 1mm, which accounts for more than 40 percent, completely enters the sintering raw materials, the ventilation resistance of the sintering raw materials is increased, the combustion efficiency of the fuel coal is reduced, and the solid fuel consumption of the sintering process is increased.

Disclosure of Invention

In order to solve the outstanding problems in the prior art, the invention provides a fine powder fine separation device. The fine powder fine separation device comprises a fine separation chamber, an air draft cover and a finished product hopper, wherein the fine separation chamber is composed of an upper chamber and a lower chamber, the air draft cover is arranged at the top of the upper chamber, and the finished product hopper is arranged at the bottom of the lower chamber. A reciprocal cyclone separator is arranged in the fine separation chamber, the lower part of the reciprocal cyclone separator is provided with a cyclone inlet, and the top of the reciprocal cyclone separator is provided with a cyclone outlet. When the fine powder fine separation device works, the air suction opening at the top of the air suction cover continuously sucks air, and fine fuel entering from the feed inlet at the side part of the fine separation chamber is subjected to centrifugal separation treatment by the reciprocal cyclone separator, so that sintered fuel meeting the particle size requirement of a sintering process is obtained. Based on the fine powder fine separation device, the invention also provides a system and a method for preparing the sintering fuel in a fixed scale. The invention can produce and prepare the sintering fuel according to the set granularity requirement, solves the influence of fine powder in the fuel on the sintering process, improves the combustion efficiency and the utilization rate of the fuel, reduces the solid fuel consumption in the sintering process, improves the air permeability of a sintering material layer, reduces the carbon emission and improves the yield.

According to a first embodiment of the present invention, there is provided a fine powder classifying apparatus.

A fine powder fine separation device comprises a fine separation chamber, an air draft cover and a finished product hopper. And a partition plate is arranged in the fine separation chamber. The partition plate divides the fine separation chamber into an upper chamber and a lower chamber. The exhaust hood is arranged at the top of the upper chamber. The finished product bucket is arranged at the bottom of the lower chamber. The lateral part of the lower chamber is provided with a feed inlet. The top of the air draft cover is provided with an air draft opening. The precise separation chamber is also internally provided with a reciprocal cyclone separator. The reciprocal cyclone separator runs through the lower chamber, and the upper end of the reciprocal cyclone separator passes through the partition plate and the lower end of the reciprocal cyclone separator passes through the bottom plate of the lower chamber. The lower part of the reciprocal cyclone separator is provided with a cyclone inlet. The swirl inlet communicates with the lower chamber. The top or the upper part of the side wall of the reciprocal cyclone separator is provided with a cyclone outlet.

In the invention, the reciprocal cyclone separator comprises a communicating pipe and a forward rotation chamber. Wherein, the lower chamber setting that the closed tube passed the smart minute cavity, the upper end of closed tube is higher than the baffle setting promptly, and the lower extreme of closed tube is less than the setting of lower chamber bottom plate. The positive rotation chamber is arranged around the outer wall of the lower end of the communicating pipe, and the top of the positive rotation chamber is connected with the lower end face of the lower chamber bottom plate. The rotary inlet is arranged at the top of the forward rotation chamber, and the forward rotation chamber is communicated with the lower chamber through the rotary inlet. A positive rotor is arranged in the positive rotation chamber and close to the rotation inlet. The spiral outlet is arranged at the top of the communicating pipe or at the upper part of the side wall. A reverse rotor is arranged in the communicating pipe and close to the rotary outlet.

Preferably, the normal and reverse rotors have opposite rotation directions. Preferably, the screw-out port is positioned in the upper chamber of the fine separation chamber.

In the invention, the reciprocal cyclone separator also comprises a reflecting plate arranged at the top of the communicating pipe. The reflecting plate comprises a transverse plate and a vertical plate connected with the transverse plate, and the transverse plate and the vertical plate form a T-shaped structure on a vertical section. The vertical plate extends downwards into the communicating pipe, the transverse plate is located above the communicating pipe, and the downward projection of the transverse plate covers the spiral outlet. The reverse rotor is arranged around the vertical plate. Preferably, the vertical plate is positioned on the central axis of the communicating pipe.

Preferably, the apparatus further comprises a dust suppression nozzle disposed within the upper chamber. Preferably, the dust suppression nozzle is disposed higher than the reflection plate. Preferably, the number of the dust suppression nozzles is multiple, and the multiple dust suppression nozzles are uniformly distributed on the same horizontal position in the upper chamber.

Preferably, the apparatus further comprises a filter screen. The filter screen is arranged on the joint surface of the fine separation chamber and the exhaust hood.

In the invention, a plurality of reciprocal cyclone separators are arranged in the fine separation chamber. Preferably, the plurality of reciprocal cyclonic separators are evenly distributed around the periphery of the refining chamber.

In the invention, a finished product sealing valve is arranged at a discharge port at the lower part of the finished product hopper.

In the present invention, the apparatus further comprises a dust slurry discharge pipe. The dust and slurry discharge pipe is arranged on the side part of the upper chamber and is communicated with the inside of the upper chamber. Preferably, a dust slurry sealing valve is arranged at the outlet of the dust slurry discharge pipe.

According to a second embodiment of the present invention, a system for scaling sintered fuel is provided.

A system for preparing sintered fuel on a fixed scale comprises a screening device, a specified particle size crushing unit and a fine powder fine separation device in the first embodiment. The screening device is provided with an oversize material outlet and an undersize material outlet. And the oversize material outlet is connected with the feed inlet of the specified granularity crushing unit. The discharge hole of the designated granularity crushing unit is connected with the feed inlet of the fine powder fine separation device. The discharge port of the undersize is also connected with the feed inlet of the fine powder fine separation device.

In the invention, the system also comprises an isointensity distributing machine arranged between the screening device and the specified granularity crushing unit. And a material outlet of oversize materials of the screening device is connected with a material inlet of the equal-strength material distributor. And a discharge port of the equal-strength distributing machine is connected with a feed port of the designated granularity crushing unit.

Preferably, the equal-strength distributing machine comprises a hopper, a material column groove, a diffusion fin and a uniform distribution spiral. The material column groove is arranged at the lower part of the hopper. The diffusion fin is disposed within the hopper. The equipartition spiral is arranged in the material column groove. Wherein, the oversize material discharge gate of screening plant is connected with the feed inlet of hopper, and the discharge gate in feed column groove is connected with the feed inlet of appointed granularity crushing unit.

In the present invention, the diffusion fin includes a circular roller and a diffusion rod connected to a lower portion of the circular roller. Preferably, the spreader pin oscillates in a vertical plane around the circular roller. Further preferably, the spreading bar oscillates around the circular roller in the lower half of the vertical plane.

Preferably, a plurality of diffusion fins are arranged in the hopper, and gaps are reserved between adjacent diffusion fins. Preferably, the plurality of diffusion fins are disposed at the same horizontal position. Further preferably, the plurality of diffusion fins are located in the middle of the hopper in the vertical direction.

In the invention, the equipartition spiral is arranged at the feed inlet of the stock column groove. The equipartition spiral comprises a first spiral blade, a second spiral blade and a transmission shaft. The transmission shaft is arranged on the stock column groove, and the first helical blade and the second helical blade are wound on the periphery of the transmission shaft. The first helical blade and the second helical blade rotate about the drive shaft.

Preferably, the first helical blade and the second helical blade are symmetrically distributed along the central plane of the stock column groove in the horizontal direction. And the first helical blade and the second helical blade have the same length and opposite rotation directions.

In the invention, the designated particle size crushing unit comprises a crusher and an online particle size detection analyzer. The crusher is arranged between the equal-strength distributor and the fine powder fine separation device. The online particle size detection analyzer is arranged on the side part of the crusher. The online particle size detection analyzer is provided with a probe which extends into a discharge hole of the crusher. Preferably, the crusher is a roller crusher, preferably a variable-gap crusher.

Preferably, the system further comprises a mixing silo arranged between the designated particle size crushing unit and the fine powder fine separation device. Wherein, the discharge gate of appointed granularity crushing unit is connected with the feed inlet of mixing bunker. The discharge hole of the mixing bin is connected with the feed inlet of the fine powder fine separation device.

Preferably, the system further comprises a fine material bin and a material guide chute. The fine material bin and the guide chute are arranged between the screening device and the mixing bin. And a screen underflow discharge port of the screening device is connected with a feed inlet of the fine material bin. The discharge hole of the fine material bin is connected with the feed inlet of the guide chute. The discharge hole of the guide chute is connected with the feed inlet of the mixing bunker.

In the present invention, the system further comprises a sintering batching system. And a discharge port of a finished product hopper of the fine powder fine separation device is connected to the sintering batching system through a first conveying device.

In the present invention, the system further comprises a second conveying means and a raw material bin arranged upstream of the screening means. The discharge end of the second conveying device is connected with the feed inlet of the raw material bin, and the discharge outlet of the raw material bin is connected with the feed inlet of the screening device. Preferably, the sieve device has a mesh size of 2.8 to 3.2mm, preferably 2.9 to 3.1mm. The first conveying device and the second conveying device are both belt conveyors.

According to a third embodiment of the present invention, a method for the scaled production of a sintered fuel is provided.

A method of scaling a sintered fuel or using the system of the second embodiment to scale a sintered fuel, the method comprising the steps of:

1) And screening the sintered fuel by a screening device to obtain oversize coarse-grained fuel and undersize fine-grained fuel.

2) And enabling the oversize coarse-grained fuel to enter a designated granularity crushing unit, and crushing the coarse-grained fuel by the designated granularity crushing unit to obtain crushed fine-grained fuel.

3) Conveying the undersize fine fuel obtained in the step 1) and the crushed fine fuel obtained in the step 2) into a fine powder fine separation device together, and performing centrifugal separation treatment on the fine fuel entering the fine powder fine separation device through a reciprocal cyclone separator to obtain the sintered fuel meeting the particle size requirement.

According to a fourth embodiment of the invention, a method for the scaled production of a sintered fuel is provided.

2) And distributing the oversize coarse-grained fuel to enter a specified granularity crushing unit through an equal-strength distributing machine, and crushing the coarse-grained fuel by using a crusher (9) of the specified granularity crushing unit to obtain crushed fine-grained fuel.

3) Conveying the undersize fine grain fuel obtained in the step 1) and the crushed fine grain fuel obtained in the step 2) into a fine grain fine separation device together, continuously exhausting air from an air exhaust opening of the fine grain fine separation device, performing centrifugal separation treatment on the fine grain fuel entering the fine grain fine separation device through a normal rotation chamber of a mutual reverse cyclone separator, and enabling sintered fuel meeting the particle size requirement after the centrifugal separation treatment to enter a finished product hopper.

4) The fine powder fuel after centrifugal separation is sequentially subjected to reversing deceleration of a contra-rotator, accelerated sedimentation of a reflecting plate, atomization sedimentation of a dust suppression nozzle and capture and interception of a filter screen, and finally the fine powder fuel is accumulated on a partition plate, is combined with water mist sprayed by the dust suppression nozzle to form dust slurry and is discharged through a dust slurry discharge pipe.

Preferably, the method further comprises:

5) And (4) conveying the sintering fuel meeting the granularity requirement obtained in the step (3) to a sintering batching system through a first conveying device for sintering batching.

In step 1) of the present invention, the particle size of the coarse fuel on the screen is > 3mm. The particle size of the undersize fine fuel is less than or equal to 3mm.

In step 2) of the invention, the particle size of the crushed fine fuel is less than or equal to 3mm.

In step 3) of the present invention, the particle size of the sintering fuel meeting the particle size requirement is 0.5 to 3mm, preferably 1 to 3mm.

In the step 4) of the invention, the granularity of the fine powder fuel is less than or equal to 0.5mm or less than or equal to 1mm.

The invention provides a fine powder fine separation device, a system for preparing sintered fuel in a fixed scale and a method thereof, aiming at the problems that fine powder fuel (the granularity is less than or equal to 0.5mm or the granularity is less than or equal to 1 mm) in sintered fuel particles after primary crushing in the prior art is difficult to control or cannot be completely screened out, and further the granularity of the sintered fuel is difficult to ensure to perfectly meet the granularity requirement of a sintering process. The invention can realize the preparation of the sintering fuel according to the specified size, solves the outstanding problems in the prior art and provides technical support for hydrogen-rich sintering.

In the invention, the fine powder fine separation device comprises a fine separation chamber, an air draft cover and a finished product hopper. And a partition plate is arranged in the fine separation chamber. The partition plate divides the fine separation chamber into an upper chamber and a lower chamber. The draught hood is arranged at the top of the upper chamber. The finished product bucket is arranged at the bottom of the lower chamber. The lateral part of the lower chamber is provided with a feed inlet. The top of the air draft cover is provided with an air draft opening. The precise separation chamber is also internally provided with a reciprocal cyclone separator. The reciprocal cyclone separator is arranged through the lower chamber, the upper end of the reciprocal cyclone separator penetrates through a top plate (namely a partition plate) of the lower chamber, and the lower end of the reciprocal cyclone separator penetrates through a bottom plate of the lower chamber. The lower part of the reciprocal cyclone separator is provided with a cyclone inlet, and the top or the upper part of the side wall of the reciprocal cyclone separator is provided with a cyclone outlet. The rotary inlet is communicated with the lower chamber, namely the lower chamber of the fine separation chamber is communicated with the interior of the reciprocal cyclone separator through the rotary inlet. When the fine powder fine separation device works, the air suction opening at the top of the air suction cover continuously sucks air, the air entering from the feed inlet is mixed with the sintering fuel under the action of the air suction opening, and the air wraps the sintering fuel and flows together with the sintering fuel to form fuel-containing air flow. The air flow containing the fuel firstly enters from the screw-in opening of the reciprocal cyclone separator through the lower chamber, and is centrifugally separated by the reciprocal cyclone separator, and the sintering fuel with larger particles (namely the sintering fuel meeting the particle size requirement) is thrown to the outer side of the reciprocal cyclone separator due to larger centrifugal acting force in the centrifugal separation process, and then falls to the finished product hopper along the side wall. In addition, the sintering fuel (namely fine powder fuel) with smaller particles is discharged from the screw-out opening from bottom to top under the action of the air flow, enters the upper chamber and is then discharged from the air suction opening. The invention can realize the separation and screening of fine powder fuel in the sintering fuel, improve the combustion efficiency and the utilization rate of the fuel, reduce the solid fuel consumption in the sintering process, improve the air permeability of a sintering material layer, reduce the carbon emission and improve the yield. In addition, the fine powder fine separation device is not only suitable for the fixed-scale screening of the sintered fuel particles, but also suitable for the separation of coarse particle materials and fine particle materials in other fields.

Specifically, the reciprocal cyclone separator comprises a communicating pipe and a forward rotation chamber. Wherein, the lower chamber setting that the closed tube passed the smart minute cavity, the upper end of closed tube is higher than the baffle setting promptly, and the lower extreme of closed tube is less than the setting of lower chamber bottom plate. The forward rotation chamber is arranged on the outer side of the lower end of the communicating pipe, preferably, the forward rotation chamber is arranged around the outer wall of the lower end of the communicating pipe, the top of the forward rotation chamber is connected with the lower end face of the bottom plate of the lower chamber, and the forward rotation chamber is located below the lower chamber. The screw-in port of the reciprocal cyclone separator is arranged at the top of the forward rotation chamber, and the rotational inlet is communicated with the lower chamber, namely the forward rotation chamber is communicated with the lower chamber of the fine separation chamber through the rotational inlet. A positive rotor is arranged in the positive rotation chamber and close to the rotation inlet. The spiral outlet is arranged at the top of the communicating pipe or at the upper part of the side wall, preferably, the spiral outlet is positioned in the upper chamber of the fine separation chamber, so that the subsequent collection and discharge of fine powder fuel are facilitated. A reverse rotor is arranged in the communicating pipe and close to the rotary outlet. Preferably, the normal rotor and the reverse rotor have opposite rotation directions. In the invention, the bottom of the forward rotation chamber is communicated with the finished product hopper, and the bottom of the communicating pipe is communicated with the forward rotation chamber. The positive rotor moves forward spirally, namely, the sintered fuel meeting the particle size requirement in all the fuels entering the fine powder fine separation device is centrifugally separated from the fine powder fuel, and the sintered fuel meeting the particle size requirement obtained after centrifugal separation falls to a finished product hopper from the inner wall of the positive rotor chamber. The fine powder fuel after centrifugal separation enters from the bottom of the communicating pipe through the forward rotation chamber and is discharged to the upper chamber from the spiral outlet at the top of the communicating pipe, so that the reverse spiral motion of the reverse rotor is beneficial to realizing reversing and decelerating when the separated fine powder fuel is discharged from the spiral outlet, and then the fine powder fuel is promoted to be settled on a bottom plate (namely a clapboard) of the upper chamber, so that the fine powder fuel is prevented from being discharged from an air suction opening to pollute the environment, and the waste of fuel resources is reduced.

Preferably, the reciprocal cyclone separator further comprises a reflecting plate arranged at the top of the communicating pipe. The reflecting plate comprises a transverse plate and a vertical plate connected with the transverse plate, and the transverse plate and the vertical plate form a T-shaped structure on a vertical section. Wherein, the riser stretches into in the UNICOM pipe downwards, and preferably, the riser is located the axis of UNICOM's pipe. The transverse plate is positioned above the communicating pipe, and the downward projection of the transverse plate covers the rotary outlet. At this time, the reverse rotator is arranged around the vertical plate. In the invention, the transverse plate is arranged above the communicating pipe, namely the transverse plate is arranged above the rotary outlet, so that the downward projection of the transverse plate of the reflecting plate covers the rotary outlet, namely the area of the transverse plate is not smaller than that of the rotary outlet, and the interception and deceleration of fine powder fuel discharged from the rotary outlet by the reflecting plate can be better realized and the fine powder fuel is promoted to be settled on the bottom plate of the upper chamber.

Preferably, the apparatus further comprises a dust suppression nozzle disposed within the upper chamber. The dust suppression nozzle is arranged higher than the reflecting plate. In the invention, the number of the dust suppression nozzles can be set to be one or more, and when the number of the dust suppression nozzles is more than one, the dust suppression nozzles are uniformly distributed on the same horizontal position in the upper chamber. When the fine powder fuel continuously rises to the dust suppression nozzle under the action of the wind flow, the dust suppression nozzle sprays atomized water downwards, and the fine powder fuel starts to condense and agglomerate under the action of water mist and then settles on the bottom plate of the upper chamber again.

Further preferably, the device further comprises a filter screen. The filter screen is arranged on the joint surface of the fine separation chamber and the exhaust hood. Namely, the horizontal position of the filter screen is higher than the dust suppression nozzle. When the fine powder fuel is subjected to reversing deceleration of the contra-rotator, accelerated sedimentation of the reflecting plate and atomized sedimentation of the dust suppression nozzle, a very small amount of fine powder fuel still continues to rise, the last very small amount of fine powder fuel is captured and intercepted by the filter screen at the moment, and finally the fine powder fuel falls onto the bottom plate of the upper chamber.

In the invention, one or more reciprocal cyclone separators can be arranged in the fine separation chamber. When the number of the mutual reverse cyclone separators is multiple, preferably, the multiple mutual reverse cyclone separators are uniformly distributed along the periphery of the fine separation chamber, so that a set of fine powder fine separation device combined by the multistage cyclone separators is formed, and fine powder fuel in the sintering fuel can be screened better. For example, when the fine separation device has a cylindrical structure, the plurality of reciprocal cyclone separators are uniformly distributed along the circumferential direction of the fine separation device.

In addition, the apparatus includes a dust slurry discharge pipe. The dust and slurry discharge pipe is arranged on the side part of the upper chamber and is communicated with the inside of the upper chamber. Because the air suction opening can continuously suck air under the working condition of the fine powder fine separation device, the dust slurry sealing valve is arranged at the outlet of the dust slurry discharge pipe, and air is prevented from entering the upper chamber through the dust slurry discharge pipe in the dust slurry discharge process. Correspondingly, the finished product sealing valve is arranged at the discharge port of the finished product hopper, so that air is prevented from entering the finished product hopper during air suction, and therefore, the feed port is also used as the only air inlet, and the cyclone separation effect of air flow on the sintering fuel is realized to the greatest extent. Therefore, the invention has the advantages of low energy consumption and thorough separation of fine powder fuel. In the application, the support frame can be arranged outside the fine separation chamber to realize the fixation of the whole fine powder fine separation device, so that the cyclone separation effect of the wind flow from bottom to top in the device on the sintering fuel and subsequent multiple dust suppression treatment can be realized.

In the scheme of the invention, after fine powder fuel centrifugally separated by a normal rotor of a normal rotor chamber sequentially passes through reversing deceleration of a reverse rotor, accelerated sedimentation of a reflecting plate, atomization sedimentation of a dust suppression nozzle and capture and interception of a filter screen, the fine powder fuel basically settles on a bottom plate of an upper chamber, and is combined with water mist sprayed by the dust suppression nozzle to form dust slurry which is discharged through a dust slurry discharge pipe. The dust slurry can be recycled, so that the waste of fuel resources is avoided; meanwhile, the fine powder fuel settles on the bottom plate of the upper chamber, namely, the fine powder fuel is basically not discharged from the air suction opening, thereby avoiding the pollution to the environment caused by the discharge of the fine powder fuel.

When the fine powder fine separation device operates, the air suction opening at the top of the air suction cover continuously sucks air, under the action of the air suction opening, the air entering from the feed inlet is mixed with the sintering fuel, and the air wraps the sintering fuel and flows together with the sintering fuel to form fuel-containing air flow. The air flow containing fuel firstly enters from the screw-in opening of the reciprocal cyclone separator through the lower chamber, and the air flow containing fuel does spiral motion under the action of the forward rotor after entering from the screw-in opening. In the process, the sintering fuel with larger particles (namely the sintering fuel meeting the particle size requirement of the sintering process) is thrown to the outer side under the action of larger centrifugal force and falls to the finished product hopper along the inner wall of the normal rotation chamber. The sintering fuel (fine powder fuel) with smaller particles enters the communicating pipe along with the airflow to continuously move upwards, and enters the counter-rotator when reaching the top, the counter-rotator decelerates, reverses and restarts the airflow, and the sintering fuel with smaller particles is discharged from the rotary outlet and enters the upper chamber. The sintered fuel entering the upper chamber mostly falls on the bottom plate of the upper chamber near the rotary outlet, and part of the extremely fine particles which settle slowly continuously rise with the airflow. The air current that continues to rise first slows down again through the reflecting plate and impels to subside, and few dust continues to rise to presses down the dirt nozzle, presses down the dirt nozzle and continuously sprays atomizing water downwards, and the dust in the air current is condensed, reunites under the effect of water smoke, subsides once more, and the dust that escapes from atomizing water in a small amount continues to rise, is caught by the filter screen finally to fall into on the upper chamber bottom plate. Finally, the dust entering the upper chamber is accumulated on the bottom plate of the upper chamber, and is combined with the water mist sprayed by the dust suppression nozzle to form dust slurry which is discharged through a dust slurry discharge pipe. The dust slurry can be recycled. Therefore, the fine powder fine separation device can separate and remove small-particle materials from large-particle materials, namely the fine powder fuel and the sintering fuel meeting the particle size requirement can be separated, meanwhile, the separated fine powder fuel can be subjected to multiple dust suppression treatments, the particle size requirement of the sintering fuel is guaranteed, meanwhile, the fine powder fuel is separated and discharged in a pollution-free mode, the environment is protected, and the waste of fuel resources is reduced.

Based on the fine powder fine separation device, the invention also provides a system for preparing the sintering fuel in a fixed scale. In the invention, the system for preparing the sintering fuel in a fixed scale comprises a screening device, a specified granularity crushing unit and a fine powder fine separation device. Conveying the fuel from the primary crushing to a screening device through a second conveying device for coarse screening, wherein fuel particles smaller than or equal to 3mm are screened in the coarse screening process, and the part of fine fuel directly enters a fine powder fine separation device; coarse fuel with the particle size larger than 3mm generated in the coarse screening process enters a specified particle size crushing unit, the coarse fuel with the larger particle size is crushed in the specified particle size crushing unit, and the coarse fuel with the particle size smaller than or equal to 3mm enters a fine powder fine separation device. The fine powder fine separation device separates fine powder fuel with the diameter less than or equal to 1mm from all the fuel entering the device, and the fine powder fuel is accumulated on the partition plate, is combined with water mist sprayed by the dust suppression nozzle to form dust slurry and is discharged through the dust slurry discharge pipe; and the rest fuel without the fine powder fuel with the diameter less than or equal to 1mm is sent to a sintering batching system by the first conveying device for sintering batching. Wherein the particle size of the rest fuel after the fine powder fuel with the particle size less than or equal to 1mm is separated is within the range of 1-3 mm. Namely, the system for preparing the sintering fuel in a fixed scale can realize the technical aim of controlling the sintering fuel to be 1-3 mm, thereby improving the combustion efficiency and the utilization rate of the fuel and reducing the solid fuel consumption in the sintering process.

It should be noted that, in the present invention, the system for preparing the sintering fuel at a fixed scale includes one or more fine powder fine separation devices, each fine powder fine separation device is provided with a fine separation chamber, an air draft cover, and a finished product hopper, and a reciprocal cyclone separator is respectively arranged in each fine separation chamber, that is, each fine powder fine separation device can independently complete fine screening (fine powder fine separation) of fine particle fuel, so as to realize separation and screening of the fine particle fuel. Therefore, the discharge port of the screen underflow of the screening device and the discharge port of the designated particle size crushing unit can be connected with the feed port of the same fine powder fine separation device, and can also be respectively connected with the feed ports of different fine powder fine separation devices. That is, the undersize fine fuel obtained after screening by the screening device and the fine fuel crushed by the specified particle size crushing unit can enter the same fine powder fine screening device for fine screening, and can also enter different fine powder fine screening devices for fine screening respectively. The feed inlet of the fine powder fine separation device is a feed inlet arranged on the side part of the lower chamber of the fine separation chamber.

It is worth noting that in the hydrogen-rich sintering technology, because the sintering process can generate more water, the fine powder fuel can be easily combined with the water to form slurry, the air permeability of the sintering material layer is greatly reduced, and the yield and the quality of the sintering process are greatly influenced, therefore, the invention also provides technical guarantee for preventing the generation of the fine powder slurry layer in the hydrogen-rich sintering process.

The size of the sieve pores of the sieving device can be adjusted according to actual process requirements. For example, the sintering process requires the particle size of the sintering fuel to be 1 to 3mm, and the screening device performs a coarse screening process, so that the screen opening size of the screening device can be set to be about 3mm. In the invention, when the sintering process requires the granularity of the sintering fuel to be 0.5-3 mm, the granularity of the fine powder fuel is less than or equal to 0.5mm.

In addition, the specific structure of the first conveying device and the second conveying device is not limited, and sintered fuels with different grain sizes in different stages can be conveyed to a specified place or device. For example, the first conveying device and the second conveying device can be both selected from a belt conveyor.

In the invention, the system for preparing the sintering fuel in a fixed scale further comprises an equal-strength distributor. The equal-strength distributing machine is arranged between the screening device and the designated granularity crushing unit. Wherein, the uniform-strength material distributor comprises a hopper, a material column groove, a diffusion fin and a uniform spiral. The material column groove is arranged at the lower part of the hopper, and the inner space of the material column groove is communicated with the inner space of the hopper. The diffusion fin is arranged in the hopper and comprises a round roller and a diffusion rod connected with the lower part of the round roller. In order to realize that the fuel entering the hopper is more uniformly distributed in the hopper and the material column groove, the number of the diffusion fins is set to be a plurality, the diffusion fins are arranged in a line and arranged on the same horizontal position (for example, the diffusion fins are arranged in a line in the middle of the hopper along the horizontal direction), and a gap is reserved between the adjacent diffusion fins for the fuel to pass through. Preferably, the diffusion rods of the diffusion fins can swing in a vertical plane around the round roller (generally, the range of the swing of the diffusion rods is in the lower half plane of the vertical plane). The oscillation of the diffusion fins makes the fuel more dispersed and thus more evenly distributed. When the material level is higher or lower at a certain position or positions in the hopper or the material column groove (namely, when the fuel distribution is not uniform), the material level can be leveled and repaired by swinging the diffusion rods of the diffusion fins at the corresponding positions. The equipartition spiral comprises a first spiral blade, a second spiral blade and a transmission shaft. Wherein, the transmission shaft sets up in the feed column groove. The first helical blade and the second helical blade are coaxially arranged and both are wound on the periphery of the transmission shaft. The first helical blade and the second helical blade are rotatable about the drive shaft. Preferably, the first helical blade and the second helical blade are symmetrically distributed along the central plane of the stock column groove (as shown in fig. 4), and the first helical blade and the second helical blade have equal length and opposite rotation directions. The fuel entering the material column groove can be simultaneously pushed to two sides from the central part by rotating the uniform-distribution spiral so as to ensure that the material in the material column groove is uniformly distributed along the width direction. After the fuel passes through the coarse screen of the screening device, coarse-grained fuel (more than 3 mm) discharged from a screen material discharge port of the screening device enters a hopper, the fuel is relatively concentrated at one point and falls, the material flows from top to bottom along the hopper wall from a blanking point, when the material passes through a diffusion fin area, the material is dispersed by the swinging of the diffusion fin, the dispersed material continues to move downwards, the uniform spiral further dispersion is obtained at a feed port of a material column groove, and finally the fuel in the material column groove is uniform and consistent at all positions. The uniform-strength material distributor can realize uniform and equal-quantity feeding in the length direction of the specified granularity crushing unit so as to ensure that the crushing pressure of the specified granularity crushing unit in each position along the length direction is uniform and consistent, and correspondingly, the abrasion in each position is uniform and consistent.

In the invention, the specified granularity crushing unit comprises a crusher and an online granularity detection analyzer. The crusher is arranged between the equal-strength distributing machine and the fine powder fine separation device, namely after the equal-strength distributing machine supplies the oversize coarse-grained fuel obtained after coarse screening uniformly and equivalently in the length direction of a roller gap of the crusher, the crusher crushes the fuel, and the fuel particles which meet the granularity requirement (less than or equal to 3 mm) after crushing enter the fine powder fine separation device to complete further fine screening. The crusher is a roller crusher, preferably a variable roll gap crusher, which can set the roll gap of the crushing rollers according to the granularity requirement of the fuel, for example a four-roller crusher with adjustable roll gap. The online particle size detection analyzer is arranged on the side portion of the crusher, a probe is arranged on the online particle size detection analyzer, the probe extends into a discharge port of the crusher, particle sizes of fuel crushed by the crusher can be detected timely, and roll gaps of the crusher are adjusted according to the detected particle sizes of the fuel, so that the roller gaps of the crusher are kept consistent in the operation process, and the particle sizes of the fuel crushed by the crusher are guaranteed to be consistent.

In the invention, the system for preparing the sintering fuel in a fixed scale further comprises a mixing bin, a fine material bin and a guide chute. The mixing bunker is arranged between the designated granularity crushing unit and the fine powder fine separation device. The discharge port of the crusher of the specified granularity crushing unit is connected with the feed inlet of the mixing bunker, and the discharge port of the mixing bunker is connected with the fuel inlet of the fine powder fine separation chamber of the fine powder fine separation device. The fine material bin and the guide chute are arranged between the screening device and the mixing bin. The discharge port of the undersize material of the screening device is connected with the feed port of the fine material bin, the discharge port of the fine material bin is connected with the feed port of the guide chute, and the discharge port of the guide chute is connected with the feed port of the mixing material bin. Because the undersize fine material from the screening device and the crushed fine material from the crushing unit with the specified granularity both need to be conveyed into the fuel inlet of the fine powder fine separation chamber of the fine powder fine separation device, the undersize fuel can be better conveyed to the fine powder fine separation device by the additional arrangement of the fine material bin, the guide chute and the mixing bin. The additional arrangement of the mixing bunker can also play a temporary storage role, when fuel in the guide chute or fuel in the designated granularity crushing unit needs to be conveyed to the fine powder fine separation device, the fuel can firstly play a buffer role in the mixing bunker, and meanwhile, fine separation work of the fine powder fine separation device is not influenced. In addition, if the discharge port of the guide chute or the discharge port of the designated particle size crushing unit is directly connected with the fine powder fine separation device, fine powder in fuel particles is easily blown out, fuel waste is further caused, and the environment is polluted.

Based on the system for preparing the sintering fuel in the fixed scale, the invention also provides a method for preparing the sintering fuel in the fixed scale by using the system. The method mainly comprises the following steps:

1) The sintered fuel is screened by a screening device to obtain oversize coarse fuel (e.g., > 3mm fuel particles) and undersize fine fuel (e.g., < 3mm fuel particles).

2) Coarse fuel on the screen is distributed to enter a designated particle size crushing unit through an isointensity distributing machine, and the coarse fuel is crushed by a crusher (9) of the designated particle size crushing unit to obtain crushed fine fuel (for example, fuel particles less than or equal to 3 mm).

3) Conveying the undersize fine fuel obtained in the step 1) and the crushed fine fuel obtained in the step 2) into a fine powder fine separation device together, continuously exhausting air from an air exhaust opening of the fine powder fine separation device, performing centrifugal separation treatment on the fine fuel entering the fine powder fine separation device through a normal rotation chamber of a mutual reverse cyclone separator, and enabling sintered fuel (namely fuel particles with the particle size of 1-3 mm) meeting the particle size requirement after the centrifugal separation treatment to enter a finished product hopper.

4) The fine powder fuel (such as fuel particles with the particle size of less than or equal to 1 mm) after the centrifugal separation treatment sequentially passes through the reversing deceleration of the counter rotor, the accelerated sedimentation of the reflecting plate, the atomization sedimentation of the dust suppression nozzle and the capture and interception of the filter screen, and finally the fine powder fuel is accumulated on the partition plate and is combined with the water mist sprayed by the dust suppression nozzle to form dust slurry which is discharged through a dust slurry discharge pipe.

5) Conveying the sintering fuel meeting the granularity requirement obtained in the step 3) to a sintering batching system through a first conveying device for sintering batching.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention can produce and prepare the sintering fuel according to the set granularity requirement, solves the problem of the influence of fine powder in the fuel on the sintering process, improves the combustion efficiency and the utilization rate of the fuel, reduces the solid fuel consumption in the sintering process, improves the air permeability of a sintering material layer, reduces the carbon emission and improves the yield.

2. The invention adopts two-stage screening devices of coarse screening and fine powder fine separation, and simultaneously introduces the equal-strength material distribution device comprising the diffusion fin and the equipartition spiral, so that equal-quantity and uniform material distribution is realized before fine powder fine separation, and further, the control on the particle size of the sintering fuel can be better realized.

3. The fine fuel entering the fine powder fine separation device is firstly subjected to cyclone centrifugal separation treatment to realize the separation of the fine fuel, so that the sintering fuel meeting the requirement of the sintering process on granularity is obtained; the separated fine powder fuel sequentially passes through reversing deceleration of the contra-rotator, accelerated sedimentation of the reflecting plate, atomization sedimentation of the dust suppression nozzle and capture and interception of the filter screen, and finally the fine powder fuel and water mist sprayed by the dust suppression nozzle are combined to form dust slurry to be discharged, and the dust slurry can be recycled. The invention has the advantages of low energy consumption and thorough separation of fine powder fuel, simultaneously ensures the purification effect of the air flow pumped out from the air suction opening, avoids the pollution to the environment and saves the fuel resource.

4. In the hydrogen-rich sintering technology, because more water is generated in the sintering process, fuel fine powder is easy to combine with water to form slurry, the air permeability of a sintering material layer is greatly reduced, and the yield and the quality of the sintering process are greatly influenced, so the invention also provides technical guarantee for preventing the generation of the fine powder slurry layer in the hydrogen-rich sintering.

Drawings

FIG. 1 is a schematic structural view of a fine powder classifying device according to the present invention;

FIG. 2 is a schematic view of the structure of the reciprocal cyclone separator of the present invention;

FIG. 3 is a schematic diagram of a system for scaling sintered fuel according to the present invention;

FIG. 4 is a schematic structural view of the constant-strength distributing machine of the present invention;

FIG. 5 is a partial use state diagram of a designated particle size crushing unit in the present invention;

FIG. 6 is a flow chart of a method of scaling sintered fuel according to the present invention.

Reference numerals:

a: fine powder fine separation device; 1: a fine separation chamber; 101: a partition plate; 102: an upper chamber; 103: a lower chamber; 10301: a lower chamber floor; 104: a feed inlet; 105: a dust suppression nozzle; 106: a filter screen; 107: a dust and slurry discharge pipe; 10701: a dust slurry seal valve; 2: an air draft hood; 201: an air suction opening; 3: a finished product hopper; 301: a finished product sealing valve; 4: a reciprocal cyclone separator; 401: a swirl inlet; 402: a screw outlet; 403: a communicating pipe; 404: a positive rotation chamber; 405: a positive rotor; 406: a derotation; 407: a reflective plate; b: a screening device; d: an equal-strength material distributor; 5: a hopper; 6: a stock column groove; 7: a diffusion fin; 701: a round roller; 702: a diffusion rod; 8: equally dividing the spiral; 801: a first helical blade; 802: a second helical blade; 803: a drive shaft; c: a specified granularity crushing unit; 9: a crusher; 10: an online particle size detection analyzer; 1001: a probe; 11: a mixing bin; 12: a fine material bin; 13: a material guide chute; 14: a raw material bin;

l1: a first conveying device; l2: a second conveying device.

Detailed Description

According to a first embodiment of the present invention, a fine powder classifying apparatus is provided.

A fine powder fine separation device A comprises a fine separation chamber 1, an exhaust hood 2 and a finished product hopper 3. A partition plate 101 is arranged in the fine separation chamber 1. The partition 101 divides the fining chamber 1 into an upper chamber 102 and a lower chamber 103. The extraction hood 2 is arranged on top of the upper chamber 102. The finishing hopper 3 is disposed at the bottom of the lower chamber 103. The side of the lower chamber 103 is provided with a feed inlet 104. The top of the draft hood 2 is provided with a draft opening 201. A reciprocal cyclone separator 4 is also arranged in the fine separation chamber 1. The reciprocal cyclone 4 is disposed through the lower chamber 103, and the upper end of the reciprocal cyclone 4 passes through the partition plate 101 and the lower end passes through the lower chamber floor 10301. The lower part of the reciprocal cyclone 4 is provided with a cyclone inlet 401. The swirl inlet 401 communicates with the lower chamber 103. The top or upper portion of the sidewall of the reciprocal cyclone 4 is provided with a cyclone outlet 402.

In the present invention, the reverse cyclone 4 includes a communicating pipe 403 and a forward rotation chamber 404. Wherein, the communicating pipe 403 passes through the lower chamber 103 of the fine separation chamber 1, that is, the upper end of the communicating pipe 403 is higher than the partition plate 101, and the lower end of the communicating pipe 403 is lower than the lower chamber bottom plate 10301. The forward rotation chamber 404 is disposed around the outer wall of the lower end of the communicating pipe 403, and the top of the forward rotation chamber 404 is connected to the lower end surface of the lower chamber bottom plate 10301. The swirl inlet 401 is disposed at the top of the forward rotation chamber 404, and the forward rotation chamber 404 is communicated with the lower chamber 103 through the swirl inlet 401. A positive rotor 405 is arranged in the positive rotation chamber 404 at a position close to the rotation inlet 401. The spiral outlet 402 is arranged at the top or on the upper part of the side wall of the communicating pipe 403. A reverse rotator 406 is arranged in the communicating pipe 403 near the rotator outlet 402.

Preferably, the rotation directions of the forward rotator 405 and the backward rotator 406 are opposite. Preferably, the swirl port 402 is located in the upper chamber 102 of the fining chamber 1.

In the present invention, the reverse cyclone 4 further comprises a reflection plate 407 disposed at the top of the communicating pipe 403. The reflecting plate 407 comprises a transverse plate and a vertical plate connected with the transverse plate, and the transverse plate and the vertical plate form a T-shaped structure on a vertical section. The vertical plate extends downwards into the communicating pipe 403, the horizontal plate is located above the communicating pipe 403, and the projection of the horizontal plate downwards covers the spiral outlet 402. The derotator 406 is disposed around the riser. Preferably, the vertical plates are located on the central axis of the communicating tube 403.

Preferably, the apparatus further includes a dust suppression nozzle 105 disposed within the upper chamber 102. Preferably, the dust suppression nozzles 105 are disposed higher than the reflection plate 407. Preferably, the number of the dust suppression nozzles 105 is plural, and the plural dust suppression nozzles 105 are uniformly distributed at the same level in the upper chamber 102.

Preferably, the apparatus further comprises a filter screen 106. The filter screen 106 is arranged on the joint surface of the fine separation chamber 1 and the exhaust hood 2.

In the invention, a plurality of reciprocal cyclone separators 4 are arranged in the fine separation chamber 1. Preferably, the plurality of reciprocal cyclonic separators 4 are evenly distributed along the periphery of the refining chamber 1.

In the present invention, a product sealing valve 301 is disposed at the discharge port at the lower part of the product bucket 3.

In the present invention, the apparatus further comprises a dust slurry discharge pipe 107. The dust and slurry discharge pipe 107 is provided at a side portion of the upper chamber 102 and communicates with the inside of the upper chamber 102. Preferably, a dust slurry sealing valve 10701 is arranged at the outlet of the dust slurry discharge pipe 107.

A system for preparing sintered fuel on a fixed scale comprises a screening device B, a specified particle size crushing unit C and a fine powder fine separation device A in the first embodiment. And the screening device B is provided with an oversize material outlet and an undersize material outlet. And the oversize material outlet is connected with the feed inlet of the specified granularity crushing unit C. The discharge hole of the designated granularity crushing unit C is connected with the feed inlet 104 of the fine powder fine separation device A. The screen underflow outlet is also connected to the inlet 104 of the fine powder fine separation device A.

In the invention, the system also comprises an equal-strength distributing machine D arranged between the screening device B and the specified granularity crushing unit C. And the oversize material outlet of the screening device B is connected with the feed inlet of the equal-strength material distributor D. And a discharge port of the uniform-strength distributing machine D is connected with a feed port of the designated granularity crushing unit C.

Preferably, the uniform-strength material distributor D comprises a hopper 5, a material column groove 6, a diffusion fin 7 and a uniform distribution screw 8. The stock column groove 6 is arranged at the lower part of the hopper 5. A diffuser fin 7 is provided in the hopper 5. The sharing screw 8 is arranged in the material column groove 6. Wherein, the oversize material discharge port of the screening device B is connected with the feed inlet of the hopper 5, and the discharge port of the material column groove 6 is connected with the feed inlet of the designated granularity crushing unit C.

In the present invention, the diffusion fin 7 includes a circular roller 701 and a diffusion rod 702 connected to a lower portion of the circular roller 701. Preferably, the spreading bar 702 oscillates in a vertical plane around the circular roller 701. Further preferably, the spreading bar 702 oscillates around the circular roller 701 in the lower half of the vertical plane.

Preferably, a plurality of diffusion fins 7 are provided in the hopper 5, and a gap is left between adjacent diffusion fins 7. Preferably, the plurality of diffusion fins 7 are disposed at the same horizontal position. Further preferably, the plurality of diffusion fins 7 are each located in the middle of the hopper 5 in the vertical direction.

In the invention, the sharing screw 8 is arranged at the feed inlet of the material column groove 6. The sharing screw 8 includes a first screw blade 801, a second screw blade 802, and a transmission shaft 803. The transmission shaft 803 is arranged on the material column groove 6, and the first helical blade 801 and the second helical blade 802 are wound on the periphery of the transmission shaft 803. The first helical blade 801 and the second helical blade 802 rotate about the drive shaft 803.

Preferably, the first helical blade 801 and the second helical blade 802 are symmetrically distributed along the center plane of the charge column chute 6 in the horizontal direction. And the first helical blade 801 and the second helical blade 802 are equal in length and opposite in direction of rotation.

In the present invention, the specified particle size crushing unit C includes a crusher 9 and an online particle size detection analyzer 10. The crusher 9 is arranged between the equal-strength distributing machine D and the fine dividing device A. The online particle size detection analyzer 10 is disposed at a side portion of the crusher 9. The online particle size detection analyzer 10 is provided with a probe 1001, and the probe 1001 extends into a discharge hole of the crusher 9. Preferably, the crusher 9 is a roller crusher, preferably a variable-gap crusher.

Preferably, the system further comprises a mixing silo 11 arranged between the designated size crushing unit C and the finely divided sub-division a. Wherein, the discharge hole of the designated granularity crushing unit A is connected with the feed inlet of the mixing bunker 11. The discharge port of the mixing bunker 11 is connected with the feed port 104 of the fine dividing and refining device A.

Preferably, the system further includes a fine material bin 12 and a material guide chute 13. The fines bin 12 and the chute 13 are disposed between the screening device B and the blending bin 11. The undersize material outlet of the screening device B is connected with the feed inlet of the fine material bin 12. The discharge hole of the fine material bin 12 is connected with the feed inlet of the guide chute 13. The discharge hole of the guide chute 13 is connected with the feed inlet of the mixing bunker 11.

In the present invention, the system further comprises a sintering batching system. And a discharge hole of a finished product hopper 3 of the fine powder fine separation device A is connected to a sintering batching system through a first conveying device L1.

In the present invention, the system also comprises a second conveyor L2 and a raw material bin 14, arranged upstream of the screening device B. The discharge end of the second conveying device L2 is connected with the feed inlet of the raw material bin 14, and the discharge port of the raw material bin 14 is connected with the feed inlet of the screening device B. Preferably, the sieve device B has a mesh size of 2.8 to 3.2mm, preferably 2.9 to 3.1mm. The first conveying device L1 and the second conveying device L2 are both belt conveyors.

Example 1

As shown in figure 1, the fine powder fine separation device A comprises a fine separation chamber 1, an air draft cover 2 and a finished product hopper 3. A partition plate 101 is arranged in the fine separation chamber 1. The partition 101 divides the fine separation chamber 1 into an upper chamber 102 and a lower chamber 103. The extraction hood 2 is arranged on top of the upper chamber 102. The finishing hopper 3 is disposed at the bottom of the lower chamber 103. The side of the lower chamber 103 is provided with a feed inlet 104. The top of the draft hood 2 is provided with a draft opening 201. A reciprocal cyclone separator 4 is also arranged in the fine separation chamber 1. The reciprocal cyclone 4 is disposed through the lower chamber 103, and the upper end of the reciprocal cyclone 4 passes through the partition plate 101 and the lower end passes through the lower chamber floor 10301. The lower part of the reciprocal cyclone 4 is provided with a cyclone inlet 401. The swirl inlet 401 communicates with the lower chamber 103. The top of the reciprocal cyclonic separator 4 is provided with a cyclone outlet 402.

Example 2

As shown in fig. 2, the embodiment 1 is repeated except that the reverse cyclone 4 comprises a communicating pipe 403 and a normal rotation chamber 404. Wherein, the communicating pipe 403 passes through the lower chamber 103 of the fine separation chamber 1, that is, the upper end of the communicating pipe 403 is higher than the partition plate 101, and the lower end of the communicating pipe 403 is lower than the lower chamber bottom plate 10301. The forward rotation chamber 404 is disposed around the outer wall of the lower end of the communicating pipe 403, and the top of the forward rotation chamber 404 is connected to the lower end surface of the lower chamber bottom plate 10301. The swirl inlet 401 is disposed at the top of the forward rotation chamber 404, and the forward rotation chamber 404 is communicated with the lower chamber 103 through the swirl inlet 401. A positive rotor 405 is arranged in the positive rotation chamber 404 at a position close to the rotation inlet 401. The swirl outlet 402 is arranged at the top of the communicating pipe 403, i.e. the swirl outlet 402 is located in the upper chamber 102 of the fine chamber 1. A reverse rotator 406 is arranged in the communicating pipe 403 near the rotator outlet 402.

Example 3

Example 2 is repeated except that the rotation directions of the forward rotator 405 and the backward rotator 406 are opposite.

Example 4

Embodiment 3 is repeated except that the reverse cyclone 4 further comprises a reflection plate 407 disposed at the top of the communicating pipe 403. The reflecting plate 407 comprises a transverse plate and a vertical plate connected with the transverse plate, and the transverse plate and the vertical plate form a T-shaped structure on a vertical section. The vertical plate extends downwards into the communicating pipe 403, the horizontal plate is located above the communicating pipe 403, and the projection of the horizontal plate downwards covers the spiral outlet 402. The derotator 406 is disposed around the riser. The vertical plate is located on the central axis of the communicating tube 403.

Example 5

Example 4 is repeated except that the apparatus further comprises a dust suppression nozzle 105 disposed within the upper chamber 102. The dust suppression nozzles 105 are disposed higher than the reflection plate 407.

Example 6

Example 5 was repeated except that the number of dust suppression nozzles 105 was 6 and the 6 dust suppression nozzles 105 were evenly distributed at the same level in the upper chamber 102.

Example 7

Example 6 is repeated except that the apparatus further comprises a filter screen 106. The filter screen 106 is arranged on the joint surface of the fine separation chamber 1 and the exhaust hood 2.

Example 8

Example 7 was repeated except that 6 reciprocal cyclone separators 4 were provided in the fining chamber 1. The 6 reciprocal cyclone separators 4 are evenly distributed along the periphery of the fine separation chamber 1.

Example 9

Example 8 is repeated except that a product sealing valve 301 is provided at the discharge port at the lower portion of the product hopper 3.

Example 10

Example 9 was repeated except that the apparatus further included a dust slurry discharge pipe 107. The dust and slurry discharge pipe 107 is provided at a side portion of the upper chamber 102 and communicates with the inside of the upper chamber 102.

Example 11

Example 10 was repeated except that the outlet of the dust slurry discharge pipe 107 was provided with a dust slurry seal valve 10701.

Example 12

As shown in FIG. 3, the system for preparing the sintering fuel in a scaling mode comprises a screening device B, a specified granularity crushing unit C and a fine powder fine separation device A. And the screening device B is provided with an oversize material outlet and an undersize material outlet. And the oversize material outlet is connected with the feed inlet of the specified granularity crushing unit C. The discharge hole of the designated granularity crushing unit C is connected with the feed inlet 104 of the fine powder fine separation device A. The discharge hole of the undersize product is also connected with the feed hole 104 of the fine powder fine separation device A. The sieve mesh size of the screening device B is 3mm.

Example 13

Example 12 is repeated except that the system further comprises an isointensive distributor D arranged between the screening device B and the designated size crushing unit C. And the oversize material outlet of the screening device B is connected with the feed inlet of the equal-strength material distributor D. And a discharge port of the uniform-strength distributing machine D is connected with a feed port of the designated granularity crushing unit C.

Example 14

As shown in fig. 4, the embodiment 13 is repeated except that the uniform-strength distributing machine D comprises a hopper 5, a stock column chute 6, a diffusion fin 7 and a dividing screw 8. The material column groove 6 is arranged at the lower part of the hopper 5. A diffusion fin 7 is provided in the hopper 5. The sharing screw 8 is arranged in the material column groove 6. Wherein, the oversize material discharge port of the screening device B is connected with the feed inlet of the hopper 5, and the discharge port of the material column groove 6 is connected with the feed inlet of the designated granularity crushing unit C.

Example 15

Example 14 was repeated except that the diffusion fin 7 includes a circular roller 701 and a diffusion rod 702 connected to a lower portion of the circular roller 701. The spreading bar 702 oscillates in the lower half of the vertical plane around the circular roller 701.

Example 16

Example 15 was repeated except that a plurality of diffusion fins 7 were provided in the hopper 5 with gaps left between adjacent diffusion fins 7. The plurality of diffusion fins 7 are disposed on the same horizontal position. The plurality of diffusion fins 7 are each located in the middle of the hopper 5 in the vertical direction.

Example 17

Example 16 was repeated except that the sharing screw 8 was disposed at the feed inlet of the stock tank 6. The sharing screw 8 includes a first screw blade 801, a second screw blade 802, and a transmission shaft 803. The transmission shaft 803 is arranged on the material column groove 6, and the first helical blade 801 and the second helical blade 802 are wound on the periphery of the transmission shaft 803. The first helical blade 801 and the second helical blade 802 rotate about the drive shaft 803.

Example 18

Example 17 was repeated except that in the horizontal direction, the first helical blade 801 and the second helical blade 802 were symmetrically distributed along the central plane of the pillar groove 6. And the first helical blade 801 and the second helical blade 802 are equal in length and opposite in direction of rotation.

Example 19

Example 18 was repeated except that the specified particle size crushing unit C included a crusher 9 and an on-line particle size detection analyzer 10. The crusher 9 is arranged between the equal-strength distributing machine D and the fine dividing device A. The online particle size detection analyzer 10 is disposed at a side portion of the crusher 9. The online particle size detection analyzer 10 is provided with a probe 1001, and the probe 1001 extends into a discharge hole of the crusher 9. The crusher 9 is a variable roll gap crusher.

Example 20

Example 19 is repeated, except that the system further comprises a mixing silo 11 arranged between the designated granulometric comminution unit C and the finely divided refiner a. Wherein, the discharge hole of the designated granularity crushing unit A is connected with the feed inlet of the mixing bunker 11. The discharge port of the mixing bunker 11 is connected with the feed port 104 of the fine dividing and refining device A.

Example 21

Example 20 is repeated except that the system further comprises a fines bin 12 and a chute 13. The fines bin 12 and the chute 13 are disposed between the screening device B and the blending bin 11. The undersize material outlet of the screening device B is connected with the feed inlet of the fine material bin 12. The discharge hole of the fine material bin 12 is connected with the feed inlet of the guide chute 13. The discharge hole of the guide chute 13 is connected with the feed inlet of the mixing bunker 11.

Example 22

Example 21 was repeated except that the system also included a sinter batch system. And the discharge hole of the finished product hopper 3 of the fine powder fine separation device A is connected to the sintering batching system through a first conveying device L1.

Example 23

Example 22 is repeated except that the system further comprises a second conveyor L2 and a raw material bin 14 arranged upstream of the screening device B. The discharge end of the second conveying device L2 is connected with the feed inlet of the raw material bin 14, and the discharge port of the raw material bin 14 is connected with the feed inlet of the screening device B. The first conveying device L1 and the second conveying device L2 are both belt conveyors.

Example 24

A method of scaling a sintered fuel, the method comprising the steps of:

1) And screening the sintered fuel by a screening device B to obtain oversize coarse-grained fuel and undersize fine-grained fuel.

2) And enabling the oversize coarse-grained fuel to enter a specified granularity crushing unit C, and crushing the coarse-grained fuel by the specified granularity crushing unit C to obtain crushed fine-grained fuel.

3) Conveying the undersize fine fuel obtained in the step 1) and the crushed fine fuel obtained in the step 2) into a fine powder fine separation device A, and performing centrifugal separation treatment on the fine fuel entering the fine powder fine separation device A through a reciprocal cyclone separator 4 to obtain the sintered fuel meeting the particle size requirement.

Example 25

A method of scaling a sintered fuel, the method comprising the steps of:

1) And screening the sintered fuel by a screening device B to obtain coarse-grained fuel on a screen with the particle size larger than 3mm and fine-grained fuel under the screen with the particle size smaller than or equal to 3mm.

2) And distributing the coarse grain fuel on the screen through an equal-strength distributor D until the coarse grain fuel enters a specified granularity crushing unit C, and crushing the coarse grain fuel by a crusher 9 of the specified granularity crushing unit C to obtain crushed fine grain fuel with the granularity of less than or equal to 3mm.

3) Conveying the undersize fine grain fuel obtained in the step 1) and the crushed fine grain fuel obtained in the step 2) into a fine grain fine separation device A, continuously exhausting air from an air exhaust opening 201 of the fine grain fine separation device A, performing centrifugal separation treatment on the fine grain fuel entering the fine grain fine separation device A through a normal rotation chamber 404 of a mutual reverse cyclone separator 4, and allowing sintered fuel meeting the particle size requirement after the centrifugal separation treatment, namely sintered fuel with the particle size of 0.5-3 mm, to enter a finished product hopper 3.

4) After centrifugal separation, fine powder fuel with the particle size of less than or equal to 0.5mm is subjected to reversing deceleration of the counter rotor 406, accelerated sedimentation of the reflecting plate 407, atomization sedimentation of the dust suppression nozzle 105 and capture and interception of the filter screen 106 in sequence, and finally the fine powder fuel is accumulated on the partition plate 101, is combined with water mist sprayed by the dust suppression nozzle 105 to form dust slurry and is discharged through the dust slurry discharge pipe 107.

Example 26

As shown in fig. 6, a method for scaling a sintered fuel includes the steps of:

2) And distributing the screened coarse grain fuel to enter a specified granularity crushing unit C through an equal-strength distributing machine D, and crushing the coarse grain fuel by a crusher 9 of the specified granularity crushing unit C to obtain crushed fine grain fuel with the particle size of less than or equal to 3mm.

3) Conveying the undersize fine grain fuel obtained in the step 1) and the crushed fine grain fuel obtained in the step 2) into a fine grain fine separation device A, continuously exhausting air from an air exhaust opening 201 of the fine grain fine separation device A, performing centrifugal separation treatment on the fine grain fuel entering the fine grain fine separation device A through a normal rotation chamber 404 of a mutual reverse cyclone separator 4, and allowing sintered fuel meeting the particle size requirement after the centrifugal separation treatment, namely sintered fuel with the particle size of 1-3 mm, to enter a finished product hopper 3.

4) After centrifugal separation, fine powder fuel with the diameter less than or equal to 1mm is subjected to reversing deceleration of a contra-rotator 406, accelerated sedimentation of a reflecting plate 407, atomization sedimentation of a dust suppression nozzle 105 and capture and interception of a filter screen 106 in sequence, and finally the fine powder fuel is accumulated on a partition plate 101, is combined with water mist sprayed by the dust suppression nozzle 105 to form dust slurry and is discharged through a dust slurry discharge pipe 107.

5) And (4) conveying the sintering fuel meeting the granularity requirement obtained in the step (3) to a sintering batching system through a first conveying device L1 for sintering batching.

Claims

1. A fine powder fine separation device is characterized in that: the fine powder fine separation device (A) comprises a fine separation chamber (1), an air draft cover (2) and a finished product hopper (3); a partition plate (101) is arranged in the fine separation chamber (1); the partition plate (101) divides the fine separation chamber (1) into an upper chamber (102) and a lower chamber (103); the air draft cover (2) is arranged at the top of the upper chamber (102); the finished product hopper (3) is arranged at the bottom of the lower chamber (103); a feed inlet (104) is arranged at the side part of the lower chamber (103); the top of the air draft cover (2) is provided with an air draft opening (201); a reciprocal cyclone separator (4) is also arranged in the fine separation chamber (1); the reciprocal cyclone separator (4) penetrates through the lower chamber (103), the upper end of the reciprocal cyclone separator (4) penetrates through the partition plate (101) and the lower end of the reciprocal cyclone separator penetrates through the lower chamber bottom plate (10301); the lower part of the reciprocal cyclone separator (4) is provided with a cyclone inlet (401); the rotary inlet (401) is communicated with the lower chamber (103); the top or the upper part of the side wall of the reciprocal cyclone separator (4) is provided with a cyclone outlet (402).

2. The fine powder fine separation device according to claim 1, characterized in that: the mutual reverse cyclone separator (4) comprises a communicating pipe (403) and a forward rotation chamber (404); wherein the communicating pipe (403) penetrates through the lower chamber (103) of the fine separation chamber (1), namely the upper end of the communicating pipe (403) is higher than the partition plate (101), and the lower end of the communicating pipe (403) is lower than the lower chamber bottom plate (10301); the forward rotation chamber (404) is arranged around the outer wall of the lower end of the communicating pipe (403), and the top of the forward rotation chamber (404) is connected with the lower end face of the lower chamber bottom plate (10301); the rotary inlet (401) is arranged at the top of the forward rotation chamber (404), and the forward rotation chamber (404) is communicated with the lower chamber (103) through the rotary inlet (401); a positive rotor (405) is arranged in the positive rotation chamber (404) and close to the rotation inlet (401); the rotary outlet (402) is arranged at the top of the communicating pipe (403) or at the upper part of the side wall; a reverse rotator (406) is arranged in the communicating pipe (403) close to the rotator outlet (402);

preferably, the rotating directions of the forward rotator (405) and the reverse rotator (406) are opposite; preferably, the cyclone outlet (402) is located in the upper chamber (102) of the fine separation chamber (1).

3. The fine powder fine separation device according to claim 2, characterized in that: the mutual reverse cyclone separator (4) also comprises a reflecting plate (407) arranged at the top of the communicating pipe (403); the reflecting plate (407) comprises a transverse plate and a vertical plate connected with the transverse plate, and the transverse plate and the vertical plate form a T-shaped structure on a vertical section; wherein the vertical plate extends downwards into the communicating pipe (403), the horizontal plate is positioned above the communicating pipe (403), and the downward projection of the horizontal plate covers the spiral outlet (402); the inverse rotator (406) is arranged around the vertical plate; preferably, the vertical plate is positioned on the central axis of the communicating pipe (403).

4. The fine powder fine separation device according to claim 3, characterized in that: the apparatus also includes a dust suppression nozzle (105) disposed within the upper chamber (102); preferably, the dust suppression nozzle (105) is arranged higher than the reflecting plate (407); preferably, the number of the dust suppression nozzles (105) is multiple, and the multiple dust suppression nozzles (105) are uniformly distributed on the same horizontal position in the upper chamber (102); and/or

The device also comprises a filter screen (106); the filter screen (106) is arranged on the joint surface of the fine separation chamber (1) and the exhaust hood (2).

5. The fine powder fine separation device according to any one of claims 1 to 4, wherein: a plurality of reciprocal cyclone separators (4) are arranged in the fine separation chamber (1); preferably, a plurality of reciprocal cyclone separators (4) are uniformly distributed along the periphery of the fine separation chamber (1); and/or

A finished product sealing valve (301) is arranged at a discharge port at the lower part of the finished product hopper (3); and/or

The apparatus further comprises a dust slurry discharge pipe (107); the dust and slurry discharge pipe (107) is arranged at the side part of the upper chamber (102) and is communicated with the interior of the upper chamber (102); preferably, a dust slurry sealing valve (10701) is arranged at the outlet of the dust slurry discharge pipe (107).

6. A system for scaling sintered fuel, comprising: the system comprises a screening device (B), a specified granularity crushing unit (C) and a fine powder fine separation device (A) as claimed in any one of claims 1 to 5; the screening device (B) is provided with an oversize material outlet and an undersize material outlet; the oversize material outlet is connected with the feed inlet of the specified granularity crushing unit (C); the discharge hole of the specified granularity crushing unit (C) is connected with the feed inlet (104) of the fine powder fine separation device (A); the discharge hole of the undersize product is also connected with the feed inlet (104) of the fine powder fine separation device (A).

7. The system of claim 6, wherein: the system also comprises an equal-strength distributing machine (D) arranged between the screening device (B) and the specified granularity crushing unit (C); the oversize material outlet of the screening device (B) is connected with the feed inlet of the equal-strength material distributor (D); the discharge hole of the uniform-strength distributing machine (D) is connected with the feed hole of the designated granularity crushing unit (C);

preferably, the uniform-strength distributing machine (D) comprises a hopper (5), a material column groove (6), a diffusion fin (7) and an equalizing screw (8); the material column groove (6) is arranged at the lower part of the hopper (5); the diffusion fin (7) is arranged in the hopper (5); the equipartition spiral (8) is arranged in the material column groove (6); wherein, the oversize material discharge port of the screening device (B) is connected with the feed inlet of the hopper (5), and the discharge port of the material column groove (6) is connected with the feed inlet of the designated granularity crushing unit (C).

8. The system of claim 7, wherein: the diffusion fin (7) comprises a round roller (701) and a diffusion rod (702) connected with the lower part of the round roller (701); preferably, the spreading bar (702) oscillates in a vertical plane around a circular roller (701); further preferably, the spreading bar (702) oscillates in the lower half plane of the vertical plane around the circular roller (701);

preferably, a plurality of diffusion fins (7) are arranged in the hopper (5), and gaps are reserved between the adjacent diffusion fins (7); preferably, the plurality of diffusion fins (7) are arranged on the same horizontal position; further preferably, the plurality of diffusion fins (7) are located in the middle of the hopper (5) in the vertical direction.

9. The system according to claim 7 or 8, characterized in that: the equipartition spiral (8) is arranged at a feed inlet of the material column groove (6); the equipartition spiral (8) comprises a first spiral blade (801), a second spiral blade (802) and a transmission shaft (803); the transmission shaft (803) is arranged on the material column groove (6), and the first helical blade (801) and the second helical blade (802) are wound on the periphery of the transmission shaft (803); a first helical blade (801) and a second helical blade (802) rotate about the drive shaft (803);

preferably, in the horizontal direction, the first helical blade (801) and the second helical blade (802) are symmetrically distributed along the central plane of the material column groove (6); the first helical blade (801) and the second helical blade (802) are equal in length and opposite in rotation direction.

10. The system according to any one of claims 7-9, wherein: the specified granularity crushing unit (C) comprises a crusher (9) and an online granularity detection analyzer (10); the crusher (9) is arranged between the uniform-strength distributing machine (D) and the fine powder fine separation device (A); the online particle size detection analyzer (10) is arranged on the side part of the crusher (9); a probe (1001) is arranged on the online particle size detection analyzer (10), and the probe (1001) extends into the position of a discharge hole of the crusher (9); preferably, the crusher (9) is a roller crusher, preferably a variable roll gap crusher.

11. The system according to any one of claims 7-10, wherein: the system also comprises a mixing bunker (11) arranged between the specified granularity crushing unit (C) and the fine powder fine separation device (A); wherein the discharge hole of the specified granularity crushing unit (C) is connected with the feed inlet of the mixing bunker (11); a discharge hole of the mixing bin (11) is connected with a feed inlet (104) of the fine powder fine separation device (A);

preferably, the system also comprises a fine material bin (12) and a material guide groove (13); the fine material bin (12) and the guide chute (13) are arranged between the screening device (B) and the mixing bin (11); a screen underflow discharge port of the screening device (B) is connected with a feed inlet of the fine material bin (12); the discharge hole of the fine material bin (12) is connected with the feed inlet of the guide chute (13); the discharge hole of the guide chute (13) is connected with the feed inlet of the mixing bin (11).

12. The system according to any one of claims 6-11, wherein: the system also includes a sinter batch system; a discharge hole of a finished product hopper (3) of the fine powder fine separation device (A) is connected to a sintering batching system through a first conveying device (L1); and/or

The system also comprises a second conveying device (L2) and a raw material bin (14) arranged upstream of the screening device (B); the discharge end of the second conveying device (L2) is connected with the feed inlet of the raw material bin (14), and the discharge outlet of the raw material bin (14) is connected with the feed inlet of the screening device (B); preferably, the sieve mesh size of the screening device (B) is 2.8-3.2 mm, preferably 2.9-3.1 mm; the first conveying device (L1) and the second conveying device (L2) are both belt conveyors.

13. A method of scaling a sintered fuel or using the system of any one of claims 6 to 12, the method comprising the steps of:

1) Screening the sintered fuel by a screening device (B) to obtain oversize coarse-grained fuel and undersize fine-grained fuel;

2) The oversize coarse fuel enters a designated particle size crushing unit (C), and the designated particle size crushing unit (C) crushes the coarse fuel to obtain crushed fine fuel;

3) Conveying the undersize fine fuel obtained in the step 1) and the crushed fine fuel obtained in the step 2) into a fine powder fine separation device (A), and performing centrifugal separation treatment on the fine fuel entering the fine powder fine separation device (A) through a reciprocal cyclone separator (4) to obtain the sintered fuel meeting the particle size requirement.

14. A method of scaling sintered fuel or using the system of any one of claims 6 to 12, the method comprising the steps of:

2) Distributing the screened coarse grain fuel to enter a specified granularity crushing unit (C) through an equal-strength distributing machine (D), and crushing the coarse grain fuel by a crusher (9) of the specified granularity crushing unit (C) to obtain crushed fine grain fuel;

3) Conveying the undersize fine grain fuel obtained in the step 1) and the crushed fine grain fuel obtained in the step 2) into a fine grain fine separation device (A), continuously exhausting air through an air exhaust opening (201) of the fine grain fine separation device (A), performing centrifugal separation treatment on the fine grain fuel entering the fine grain fine separation device (A) through a normal rotation chamber (404) of a reciprocal cyclone separator (4), and enabling sintered fuel meeting the particle size requirement after the centrifugal separation treatment to enter a finished product hopper (3);

4) Fine powder fuel after centrifugal separation is sequentially subjected to reversing deceleration of a contra-rotator (406), accelerated sedimentation of a reflecting plate (407), atomized sedimentation of a dust suppression nozzle (105) and capture and interception of a filter screen (106), and finally the fine powder fuel is accumulated on a partition plate (101), combined with water mist sprayed by the dust suppression nozzle (105) to form dust slurry and discharged through a dust slurry discharge pipe (107);

preferably, the method further comprises:

5) And (3) conveying the sintering fuel meeting the granularity requirement obtained in the step 3) to a sintering batching system through a first conveying device (L1) for sintering batching.

15. The method of claim 14, wherein: in step 1), the particle size of the coarse fuel on the screen is more than 3mm; the particle size of the undersize fine fuel is less than or equal to 3mm; and/or

In the step 2), the particle size of the crushed fine grain fuel is less than or equal to 3mm; and/or

In the step 3), the granularity of the sintering fuel meeting the granularity requirement is 0.5-3 mm, preferably 1-3 mm; and/or

In the step 4), the granularity of the fine powder fuel is less than or equal to 0.5mm or less than or equal to 1mm.