WO2022111137A1

WO2022111137A1 - Dust-free dry dust discharging system, and converter flue gas treatment system

Info

Publication number: WO2022111137A1
Application number: PCT/CN2021/124699
Authority: WO
Inventors: 葛雷
Original assignee: 中冶南方工程技术有限公司
Priority date: 2020-11-30
Filing date: 2021-10-19
Publication date: 2022-06-02
Also published as: CN112359162A

Abstract

A dust-free dry dust discharging system, comprising a dust bin, a dust discharging main pipe and a lifting type dust discharging device. The lifting type dust discharging device comprises a first spiral dust conveying machine, a second spiral dust conveying machine, and a lifting driving unit. A material feeding port of the first spiral dust conveying machine is connected to the dust discharging main pipe by means of a telescopic hose. A material discharging port of the first spiral dust conveying machine is connected to a material feeding port of the second spiral dust conveying machine. The second spiral dust conveying machine conveys dust downwards, and is combined with the first spiral dust conveying machine to form an integrated structure. The lifting driving unit is connected to the integrated structure. In the present invention, the first spiral dust conveying machine and the second spiral dust conveying machine are combined, so that secondary flying dust in the dust discharging process may be significantly reduced compared to means which rely on the free fall of dry dust for discharging dust. The dust conveying process is stable and reliable, and problems such as dry dust being blocked in pipelines may be avoided. With the effect of the lifting driving unit, dust does not overflow during dust discharging, and the environmental protection performance is ensured.

Description

Dry ash and dust-free ash discharge system and converter flue gas treatment system

technical field

The invention belongs to the technical field of dust removal, in particular to the technical field of converter flue gas dust removal, and particularly relates to a dry ash and dust-free ash discharge system and a converter flue gas treatment system using the dry ash and dust-free ash discharge system.

Background technique

With the continuous improvement of environmental protection requirements, most of the newly built and rebuilt converters use dry dust removal systems. The high-temperature coarse ash collected by the evaporative cooler is generally sent to the coarse ash silo in the main factory building through the built-in double-chain conveyor, and then transported out by the vehicle after humidification. It is far away, and the drop is large, which is easy to cause secondary dust; the second is that a large amount of steam is generated after humidification of the high-temperature coarse ash, which affects the working environment in the main workshop.

Chinese patent applications CN107826768A, CN201721633717.5, etc. disclose dry dust and dust-free ash unloading systems, which use a telescopic metal hose to cooperate with a hoist, so that the telescopic metal hose can be as close to the ash transporter as possible, and humidification and ash unloading can be eliminated. , Reduce secondary dust. However, in actual production, it is found that when this method is adopted, it is difficult to avoid secondary dust due to gravity discharge in the retractable metal hose, especially when the alignment of the retractable metal hose and the ash transport vehicle is deviated. In addition, when the method is adopted, the material pressure in the ash discharge pipe is very large, and the ash discharge process is not easy to control. The pipelines such as the ash discharge main pipe should be arranged vertically, otherwise it is easy to cause the phenomenon of dry ash jamming, so Increases the difficulty of unloading operations.

SUMMARY OF THE INVENTION

The invention relates to a dry ash and dust-free ash discharge system and a converter flue gas treatment system using the dry ash and dust-free ash discharge system, which can at least solve some of the defects of the prior art.

The invention relates to a dry ash and dust-free ash unloading system, comprising an ash bin, an ash unloading main pipe and a lift-type ash unloading device. It includes a first screw conveyor, a second screw conveyor and a lift drive unit. The feed port of the first screw conveyor is connected to the ash unloading main pipe through a telescopic hose, and the first screw conveyor is The discharge port of the machine is connected with the feed port of the second screw ash conveyor, the second screw ash conveyor downwardly transports ash and is combined with the first screw ash conveyor into an integral structure, the lifting and lowering The drive unit is connected with the integrated structure.

As one embodiment, the axis of the first ash conveyor is parallel to the horizontal direction, and the axis of the second ash conveyor is parallel to the vertical direction.

As one of the embodiments, the lift-type ash unloading device further includes a dust collecting hood, the dust collecting hood is sleeved on the casing of the second ash conveyor, and the output of the second ash conveyor is closed. Material masks are located inside.

As one of the embodiments, the dust collecting hood is provided with a dust extraction pipe, and the dust extraction pipe is connected with a dust removal mechanism through a telescopic hose.

As one of the embodiments, the first ash conveyor and/or the second ash conveyor is provided with a blowing aid pipe, and the blowing aid pipe is connected with an inert gas supply pipe through a telescopic hose.

As one embodiment, the dry ash and dust-free ash unloading system further includes an accident ash discharge pipe and an accident ash discharge device, the accident ash discharge pipe is respectively connected to the ash bin and the accident ash discharge device, and the accident ash discharge pipe is respectively connected to the ash bin and the accident ash discharge device. A second ash discharge control valve is arranged on the accident ash discharge pipe.

As one embodiment, the accidental ash discharge device includes a ground suction device, or includes a telescopic discharge pipe and a telescopic drive unit for driving the telescopic discharge pipe to extend and retract.

The present invention also relates to a converter flue gas treatment system, including a flue gas dedusting device and the above dry ash and dust-free ash unloading system, wherein the ash discharge port of the flue gas dedusting device communicates with the Ash bin connection.

The present invention has at least the following beneficial effects:

In the present invention, the combination of the first screw ash conveyor and the second screw ash conveyor can significantly reduce the secondary dust during the ash unloading process compared with the way of relying on the free fall of dry ash to unload ash; Stable and reliable, it can avoid the phenomenon of dry ash getting stuck in the pipeline; with the function of the lift drive unit, the second screw ash conveyor can be as close as possible to the ash transporter (such as docking with the ash transporter for ash unloading) to discharge ash. There is no dust spillage at any time, ensuring environmental protection. Based on the characteristics of the screw cavity of the screw ash conveyor, it has a certain dry ash buffer function, which can better coordinate the pace difference between the production process and the ash unloading process, and the ash unloading can be adjusted through the drive motor of the screw ash conveyor. speed, making the ash discharge process easy to control.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative efforts.

1 is a schematic structural diagram of a dry ash and dust-free ash unloading system provided by an embodiment of the present invention;

FIG. 2 and FIG. 3 are schematic diagrams of two structures of the first screw ash conveyor according to the embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

As shown in FIG. 1, an embodiment of the present invention provides a dry ash and dust-free ash unloading system, including an ash bin 1, an ash unloading main pipe 21 and a lift-type ash unloading device 22, and a first ash unloading pipe is provided on the ash unloading main pipe 21 control valve, the lift-type ash unloading device 22 includes a first screw ash conveyor 221, a second screw ash conveyor 222 and a lift drive unit 226, and the feed port of the first screw ash conveyor 221 passes through a telescopic hose 227 is connected with the ash unloading main pipe 21, the discharge port of the first screw ash conveyor 221 is connected with the feed port of the second screw ash conveyor 222, and the second screw ash conveyor 222 is downward The ash conveying is integrated with the first screw ash conveyor 221 as an integral structure, and the lift driving unit 226 is connected with the integral structure.

The above-mentioned ash bin 1 is used to receive and store dry ash, and the ash bin 1 can be made of carbon steel or boiler steel. In one embodiment, the ash bin 1 is equipped with a material level gauge to detect the height of the material level in the bin, and the material level gauge can be a radar level gauge or the like.

It can be understood that the above-mentioned ash discharge main pipe 21 is connected to the ash discharge port of the ash bin 1; the above-mentioned first ash discharge control valve can be a conventional ash discharge valve, and the ash discharge main pipe 21 can be controlled by the first ash discharge control valve. On and off, in this embodiment, the first ash discharge control valve includes a manual flap valve and a pneumatic double-layer flap valve.

The above-mentioned lift-type ash unloading device 22 is used to complete the ash unloading operation, such as unloading dry ash to the ash transport vehicle 4 . The above-mentioned first screw ash conveyor 221 and second screw ash conveyor 222 can all adopt the structure of a conventional screw ash conveyor, which generally includes a casing, a main shaft, a helical blade arranged on the main shaft, and a drive for driving the main shaft to rotate. The specific structure of the motor is not described in detail here. The first screw ash conveyor 221 and the second screw ash conveyor 222 are preferably welded together to form the above-mentioned integrated structure, or the two are installed on the same structural plate, etc., so that the two can rise and fall at the same time. Can be; It is preferable to design the casing of the first screw ash conveyor 221 and the casing of the second screw ash conveyor 222 to be welded to ensure the air tightness when the two are transporting ash, and the performance such as the strength of the above-mentioned integrated structure. Also better.

In one embodiment, the above-mentioned first ash conveyor 221 is preferably arranged horizontally, that is, its axis is parallel to the horizontal direction; the above-mentioned second ash conveyor 222 is preferably arranged vertically, that is, its axis is parallel to the vertical direction; The two are connected vertically; the dry ash can descend to the first screw ash conveyor 221 by its own weight and the pressure of the material in the ash bin 1, and the first screw ash conveyor 221 can stably and reliably transport the dry ash to the second screw ash conveyor 222 , the second screw ash conveyor 222 unloads ash to the ash transporter 4 stably and reliably. Of course, it is not limited to the above structure. For example, the axis of the first ash conveyor 221 has an included angle with the horizontal plane and the first ash conveyor 221 conveys ash downward, and the axis of the second ash conveyor 222 can also be aligned with the horizontal plane. The vertical direction has an included angle to facilitate arrangement.

The above-mentioned lift driving unit 226 is used to drive the integrated structure formed by the connection of the first screw conveyor 221 and the second screw conveyor 222 to rise or fall. The lift drive unit 226 can use conventional lift drive equipment, such as air cylinders/hydraulic cylinders. Etc., in this embodiment, as shown in FIG. 1 , a hoisting and lifting device is used, and a large lifting and lowering driving stroke can be obtained in a limited space.

Optionally, as shown in FIG. 1 , the lift drive unit 226 is connected to the second screw ash conveyor 222 ; correspondingly, lift guide rails can be arranged for the first screw ash conveyor 221 to ensure the stability of the lift movement of the integrated structure.

The telescopic hose 227 between the above-mentioned first ash conveyor 221 and the ash discharge main pipe 21 is preferably a metal hose, which can be better adapted to the lifting motion of the first ash conveyor 221; the metal hose is preferably Made of weathering steel to ensure its service life.

In an optional embodiment, the first ash conveyor 221 and/or the second ash conveyor 222 is provided with a blowing aid pipe 225, and the blowing aid pipe 225 is connected with an inert gas supply through a telescopic hose. Pipe; as shown in FIG. 1 , the above-mentioned blowing aid pipe 225 is arranged at the connection between the first screw ash conveyor 221 and the second screw ash conveyor 222 . Blowing inert gas into the ash conveyor through the auxiliary blowing pipe 225 can accelerate the movement of dry ash to improve the smoothness of ash unloading, and can dilute the concentration of toxic gases such as coal gas that may be carried in the dry ash. The above-mentioned inert gas supply pipe is preferably connected to a nitrogen source, that is, nitrogen is used for the blowing-assisting operation, so as to ensure environmental protection.

The dry ash and dust-free ash unloading system provided in this embodiment adopts the combination of the first screw ash conveyor 221 and the second screw ash conveyor 222, which can significantly reduce the amount of unloading compared to the way of unloading ash by relying on the free fall of dry ash. secondary dust in the ash process; the ash conveying process is stable and reliable, which can avoid the phenomenon of dry ash getting stuck in the pipeline; with the function of the lift drive unit 226, the second screw ash conveyor 222 can be as close as possible to the ash transporter 4 (such as docking with ash transporter 4 for ash unloading), no dust spills during ash unloading, ensuring environmental protection. Based on the characteristics of the screw cavity of the screw ash conveyor, it has a certain dry ash buffer function, which can better coordinate the pace difference between the production process and the ash unloading process, and the ash unloading can be adjusted through the drive motor of the screw ash conveyor. speed, making the ash discharge process easy to control.

Further optimization of the above-mentioned lift-type ash unloading device 22, as shown in FIG. 1, the lift-type ash unloading device 22 further includes a dust collecting hood 223, the dust collecting hood 223 is sleeved on the casing of the second screw ash conveyor 222 and The discharge mask of the second screw ash conveyor 222 is arranged inside. The dust hood 223 can effectively capture the secondary dust generated during the ash unloading process of the second screw ash conveyor 222, thereby further improving the environmental protection of the ash unloading system. Further preferably, as shown in FIG. 1 , the dust collection hood 223 is provided with a dust extraction pipe 224 , the dust extraction pipe 224 is connected with a dust removal mechanism through a telescopic hose, and the dust extraction pipe 224 is penetrated on the dust collection hood 223 , the dust extraction port is communicated with the cover cavity of the dust collecting hood 223 , and the dust collected by the dust collecting hood 223 can be taken away through the dust extraction pipe 224 .

Further optimizing the above-mentioned lift-type ash unloading device 22, the main shaft 2211 and/or the helical blade 2212 of the above-mentioned first screw ash conveyor 221 is a hollow structure and is connected with a first heat exchange medium pipeline. It is understood that the above-mentioned first heat exchange medium pipeline The medium pipeline is communicated with the main shaft 2211 and/or the hollow cavity of the helical blade 2212 of the first screw ash conveyor 221, and the heat exchange medium can be passed into the main shaft 2211 and/or the helical blade 2212 of the first screw ash conveyor 221; And/or, as shown in FIG. 2 , a heat exchange sleeve 2214 is sleeved on the outer periphery of the casing of the first screw conveyor 221, and the heat exchange sleeve 2214 is connected with a second heat exchange medium pipeline. The above scheme is suitable for the case where the dry ash temperature is high, such as the coarse ash produced in the process of converter flue gas treatment; this scheme can make full use of the dry ash waste heat and avoid the waste of dry ash heat; The scheme of the medium pipeline and the second heat exchange medium pipeline to make full use of the dry ash waste heat. The above heat exchange medium can be water or air, and the water or air after heat exchange can be used for resource utilization. Further, a plurality of fins can be arranged on the helical blade 2212, and these fins extend into the helical cavity, which can improve the heat exchange effect between the helical blade 2212 and the dry ash; the above-mentioned fins can also adopt a hollow structure, so that the heat exchange medium can also be used. It can enter these fins to further improve the utilization effect and efficiency of dry ash waste heat. Further preferably, the flow direction of the heat exchange medium in the first heat exchange medium pipeline and the second heat exchange medium pipeline is opposite to the flow direction of the dry ash in the first screw ash conveyor 221, which can improve the heat exchange effect and efficiency. For the case where the main shaft 2211 and the helical blade 2212 are hollow structures, as shown in FIG. 3 , the configured drive motor 2213 can be dislocated with the main shaft 2211, and the two are connected by a transmission mechanism (transmission belt, etc.), so that the transmission side of the main shaft 2211 is connected to the first A heat exchange medium pipeline is connected (for example, connected with the high temperature medium pipe in the first heat exchange medium pipeline through a rotary joint), and the other end of the main shaft 2211 extends into the second screw ash conveyor 222 and is connected to the wearer through the rotary joint. The first heat exchange medium pipeline provided on the second screw ash conveyor 222 is connected (for example, connected with the low temperature medium pipe of the first heat exchange medium pipeline); It is also a feasible solution for the hollow rotating shaft to pass out of the casing of the motor 2213 so as to be connected with the first heat exchange medium pipeline.

Similarly, the main shaft and/or the helical blades of the second screw ash conveyor 222 can be designed to be hollow and connected with a third heat exchange medium pipeline, and/or the outer shell of the second screw ash conveyor 222 can be designed A heat exchange sleeve is sleeved, and the heat exchange sleeve is connected with a fourth heat exchange medium pipeline; for the specific arrangement structure, reference may be made to the relevant content in the above-mentioned first screw ash conveyor 221, which will not be repeated here. This solution can further utilize the residual heat of dry ash, for example, the heat exchange medium is preheated by the second screw ash conveyor 222, and then enters the first screw ash conveyor 221 for heat exchange, and the heat exchange effect is better.

In a preferred solution, as shown in FIG. 1 , the above dry ash and dust-free ash unloading system further includes an accident ash discharge pipe 31 and an accident ash discharge device, and the accident ash discharge pipe 31 is respectively connected to the ash bin 1 and the accident discharge ash The ash device is connected, and the accident ash discharge pipe 31 is provided with a second ash discharge control valve. In the event of an accident or other emergencies, the above-mentioned accident ash unloading pipe 31 and the accident ash unloading device can be switched to perform ash unloading operation, so as to ensure the safe operation of the ash unloading system. In one embodiment, the above-mentioned accident ash unloading device may adopt a ground suction device, and the ground suction device 32 cooperates with the vacuum suction and discharge truck 33 to complete the ash unloading operation; in another embodiment, the above-mentioned accident unloading device The ash device can use a mobile accident ash bin 1, or a telescopic wear-resistant hose (see CN107826768A, CN201721633717.5 and other patents), etc.; All schemes can realize the dust-free ash unloading operation during the accident ash unloading process.

Embodiment 2

An embodiment of the present invention provides a converter flue gas treatment system, including a flue gas dedusting device and the dry ash and dust-free ash unloading system provided in the above-mentioned first embodiment. The ash bin 1 is connected.

The above-mentioned flue gas dust removal device can be a coarse dust collector such as a gravity dust collector connected to the outlet end of the vaporization cooling flue (generally between the vaporization cooling flue and the waste heat boiler), or it can be a bag filter or an electric dust collector used in the subsequent fine dust removal. dust collector. The dust generated during the operation of the above-mentioned flue gas dedusting device can be discharged through the above-mentioned dry dust-free dust-discharging system. The above-mentioned dry ash transfer unit may be pneumatic conveying, or adopt a built-in double chain conveyor, which is conventional equipment in the field, and the specific structure will not be repeated here.

The temperature of dust-removing ash produced in the converter flue gas treatment process is relatively high. For example, the temperature of the coarse ash produced in the coarse dust-removing equipment downstream of the vaporization cooling flue is generally around 150°C; or when the temperature of the flue gas at the outlet of the evaporative cooler is controlled at around 250°C , the temperature of the collected coarse ash can be as high as 200 ℃ or more; for example, the temperature of the fine ash produced by the electrostatic precipitator is generally about 80 ℃. Therefore, it is preferable to utilize the waste heat of dust removal, that is, to adopt a structure in which a heat exchange medium pipeline is connected to the above-mentioned screw ash conveyor.

In one embodiment, the converter flue gas treatment system further includes a gas cooler, a switching station, a venting chimney and a gas cabinet, and the flue gas pipeline is connected to the flue gas dust removal device, the gas cooler and the switching station in sequence , the outlet of the switching station is connected to the emission chimney through a first flue gas branch and is connected to the gas cabinet through a second flue gas branch. In this gas cooler front-end solution, if the flue gas direction is gas cooler-switching station-venting chimney, the above-mentioned waste heat of dust removal ash can be used to heat the air, and the heated hot air can be mixed into the venting flue gas to improve the venting flue gas. to reduce the generation of white mist at the outlet of the chimney; accordingly, each of the above-mentioned heat exchange medium pipes includes a low temperature medium pipe and a high temperature medium pipe, one end of the low temperature medium pipe is connected to the blower and the other end is connected to the corresponding screw ash conveyor One end of the high temperature medium pipe is connected with the corresponding screw ash conveyor and the other end is connected with the first flue gas branch. .

In another embodiment, the above-mentioned converter flue gas treatment system adopts a waste heat boiler to recover the waste heat of the converter flue gas; the above-mentioned waste heat of dust removal ash can be used to heat the condensed water or feed water in the waste heat boiler water circulation system, so as to reduce the operation energy consumption of the waste heat boiler; correspondingly , a heat exchanger can be arranged between the condenser and the deaerator of the waste heat boiler, and the above-mentioned high-temperature medium pipe is designed to be connected to the heat exchanger, or the pipe between the condenser and the deaerator of the waste heat boiler is designed to be connected with the above-mentioned No. A screw conveyor 221 is connected, and the condensed water directly flows through the first screw conveyor 221, and the heat exchange effect is better.

In another optional embodiment, the above-mentioned first screw ash conveyor 221 adopts a double feed port conveyor, and the ash discharge main pipe 21 is connected to the first feed port of the first screw ash conveyor 221. The second feeding port of the screw ash conveyor 221 is connected with a binder supply pipe, and a molding device is arranged just below the discharge port of the first screw ash conveyor 221 .

The above-mentioned binder supply pipe is used to supply the binder into the first screw ash conveyor 221, and a silo can be arranged above the above-mentioned second feed port to store the binder, and the binder supply pipe is connected to the material. The bottom of the silo; in one embodiment, the binder supplied by the binder supply pipe is a conventional environmentally friendly binder such as starch. Further preferably, the second feeding port is also connected with a distribution material supply pipe, which is used to add the distribution material into the first screw ash conveyor 221; similarly, a silo can be arranged above the second feeding port to The distribution material is stored, and the distribution material supply pipe is connected at the bottom of the silo; in one embodiment, the distribution material added through the distribution material supply pipe is sintered ore return ore. Of course, the binders and ingredients used are not limited to the above-mentioned solutions, and can be selected according to the specific use of the dust removal ash, which will not be listed here.

Wherein, the second feeding port is preferably located upstream of the first feeding port, that is, the discharge port, the first feeding port and the second feeding port of the first screw ash conveyor 221 are arranged in sequence, so as to avoid the first feeding port. Dust overflow occurs when the second feed port is located downstream of the first feed port.

In the above scheme, the screw ash conveyor with double feed ports is used for the ash unloading operation. Based on the characteristics of the screw ash conveyor, the mixing of the binder and the dust removal can be completed in the screw ash conveyor, and the material is exported from the screw ash conveyor. Directly entering the molding device to realize the disposal of the converter dust and dust can significantly shorten the converter dust and dust disposal process, reduce the number of equipment and occupied space required for the converter dust and dust disposal, and reduce the cost of converter dust and dust disposal.

The above-mentioned molding device can be selected according to the target form of dust removal, such as a briquetting machine, a granulator, a briquetting machine, and the like.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims

A dry ash and dust-free ash unloading system includes an ash bin, an ash unloading main pipe and a lift-type ash unloading device, and a first ash unloading control valve is arranged on the ash unloading main pipe, characterized in that: the lift-type ash unloading device is characterized in that: The device includes a first screw conveyor, a second screw conveyor and a lift drive unit. The feed port of the first screw conveyor is connected to the ash discharge main pipe through a telescopic hose, and the first screw conveyor is connected to the main pipe. The discharge port of the ash machine is connected with the feed port of the second screw ash conveyor, and the second screw ash conveyor downwardly transports ash and is combined with the first screw ash conveyor into an integrated structure. The lift driving unit is connected with the integrated structure.
The dry ash and dust-free ash unloading system according to claim 1, wherein the axis of the first screw conveyor is parallel to the horizontal direction, and the axis of the second screw conveyor is parallel to the vertical direction.
The dry ash and dust-free ash unloading system according to claim 1, wherein the lift-type ash unloading device further comprises a dust collecting hood, and the dust collecting hood is sleeved on the casing of the second screw ash conveyor and the discharge mask of the second screw ash conveyor is arranged inside.
The dry dust-free dust-removing system according to claim 3, characterized in that: the dust collecting hood is provided with a dust extraction pipe, and the dust extraction pipe is connected with a dust removal mechanism through a telescopic hose.
The dry ash and dust-free ash unloading system according to any one of claims 1 to 4, characterized in that: the first screw ash conveyor and/or the second screw ash conveyor is provided with a blowing-assisting pipe, so The blowing aid pipe is connected with an inert gas supply pipe through a telescopic hose.
The dry ash and dust-free ash unloading system according to claim 1, further comprising an accident ash discharge pipe and an accident ash discharge device, the accident ash discharge pipe is respectively connected with the ash bin and the accident ash discharge device connected, and a second ash discharge control valve is arranged on the accident ash discharge pipe.
The dry ash and dust-free ash unloading system according to claim 6, wherein the accident ash unloading device comprises a ground suction device, or a telescopic discharge pipe and a telescopic discharge pipe for driving the telescopic discharge pipe to expand and contract. Telescopic drive unit.
A converter flue gas treatment system, comprising a flue gas dedusting device, characterized in that it further comprises the dry ash and dust-free ash unloading system according to any one of claims 1 to 7, wherein the ash unloading of the flue gas dedusting device The mouth is connected to the ash bin through a dry ash transport unit.