CN214168029U - Converter flue gas processing system - Google Patents
Converter flue gas processing system Download PDFInfo
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- CN214168029U CN214168029U CN202022818928.4U CN202022818928U CN214168029U CN 214168029 U CN214168029 U CN 214168029U CN 202022818928 U CN202022818928 U CN 202022818928U CN 214168029 U CN214168029 U CN 214168029U
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Abstract
The utility model relates to a converter flue gas processing system, including flue gas dust collector and ash unloading system, the ash unloading system includes the ash storehouse, main ash unloading device and the ash unloading person in charge who connects ash storehouse and main ash unloading device, be equipped with the ash unloading control valve on the ash unloading person in charge, flue gas dust collector's the ash unloading mouth transports the unit through dry ash and is connected with the ash storehouse, main ash unloading device includes the defeated grey machine of first spiral, the feed inlet of the defeated grey machine of first spiral is responsible for with the ash unloading and is connected, the main shaft of the defeated grey machine of first spiral and/or helical blade are hollow structure and are connected with first heat transfer medium pipeline, and/or the peripheral cover of the casing of the defeated grey machine of first spiral is equipped with first heat transfer sleeve pipe, this first heat transfer sleeve union coupling has second heat transfer medium pipeline. The utility model discloses a spiral ash conveyor unloads grey operation to with this spiral ash conveyor design for heat exchange structure, but make full use of dust removal ash waste heat, avoid the thermal waste of dust removal ash, improve converter flue gas processing system's operation economic nature and feature of environmental protection effectively.
Description
Technical Field
The utility model relates to a converter flue gas processing system.
Background
With the continuous improvement of the environmental protection requirement, the dry dedusting system is mostly adopted for the newly built and reconstructed converters. The collected dust removed in the dry dust removal process is generally conveyed to an ash bin in a main plant by a built-in double-chain conveyor, and is transported outside by an automobile after being humidified. The temperature of dust removed ash generated in the converter flue gas treatment process is high, for example, the temperature of the coarse ash generated in coarse dust removal equipment at the downstream of a vaporization cooling flue is generally about 150 ℃; or when the temperature of the flue gas at the outlet of the evaporative cooler is controlled to be about 250 ℃, the temperature of the collected coarse ash can be as high as more than 200 ℃; for example, the fine ash produced by an electric dust collector is generally at a temperature of about 80 ℃. However, the existing converter flue gas treatment system does not utilize the residual heat of the high-temperature dedusting ash, so that the energy is wasted; and a large amount of steam is generated after the high-temperature fly ash is humidified, so that the working environment in the main workshop is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a converter flue gas treatment system, which can at least solve part of the defects of the prior art.
The utility model relates to a converter flue gas processing system, including flue gas dust collector and ash unloading system, the ash unloading system includes ash bin, main ash unloading device and connection the ash bin with the main ash unloading of ash unloading device is responsible for, in the ash unloading is responsible for and is equipped with the ash unloading control valve, flue gas dust collector's ash unloading mouth through dry ash transport unit with the ash bin is connected, main ash unloading device includes the defeated grey machine of first spiral, the feed inlet of the defeated grey machine of first spiral with the ash unloading is responsible for and connects, the main shaft and/or the helical blade of the defeated grey machine of first spiral are hollow structure and are connected with first heat transfer medium pipeline, and/or the peripheral cover of the casing of the defeated grey machine of first spiral is equipped with first heat transfer sleeve pipe, and this first heat transfer sleeve pipe connection has the second heat transfer medium pipeline.
As one embodiment, the main ash discharge device further comprises a second spiral ash conveyor, wherein the discharge port of the first spiral ash conveyor is connected with the feed port of the second spiral ash conveyor, and the second spiral ash conveyor conveys ash downwards.
In one embodiment, the main shaft and/or the helical blades of the second spiral ash conveyor are hollow and connected with a third heat exchange medium circulation pipeline, and/or a second heat exchange sleeve is sleeved on the periphery of a shell of the second spiral ash conveyor and connected with a fourth heat exchange medium pipeline.
As one embodiment, the main ash discharging device further comprises a lifting driving unit, a feed inlet of the first spiral ash conveyor is connected with the ash discharging main pipe through a flexible hose, the first spiral ash conveyor and the second spiral ash conveyor are combined into an integral structure, and the lifting driving unit is connected with the integral structure.
In one embodiment, the axis of the first spiral ash conveyor is parallel to the horizontal direction, and the axis of the second spiral ash conveyor is parallel to the vertical direction.
In one embodiment, the main dust discharging device further comprises a dust collection cover, and the dust collection cover is sleeved on the shell of the second spiral dust conveyor and covers the discharge port of the second spiral dust conveyor.
In one embodiment, the dust collecting cover is provided with a dust suction pipe, and the dust suction pipe is connected with a dust removing mechanism through a flexible hose.
In one embodiment, the first spiral ash conveyor and/or the second spiral ash conveyor is provided with a blowing-assisting pipe, and the blowing-assisting pipe is connected with an inert gas supply pipe.
As one embodiment, the converter flue gas treatment system further comprises a gas cooler, a switching station, a bleeding chimney and a gas tank, wherein a flue gas pipeline is sequentially connected with the flue gas dust removal device, the gas cooler and the switching station, and an outlet of the switching station is connected with the bleeding chimney through a first flue gas branch and is connected with the gas tank through a second flue gas branch.
As one embodiment, the first heat exchange medium pipeline includes a low-temperature medium pipe and a high-temperature medium pipe, the low-temperature medium pipe is connected with the air blower and the first spiral ash conveyor respectively, and the high-temperature medium pipe is connected with the first spiral ash conveyor and the first flue gas branch respectively.
The utility model discloses following beneficial effect has at least:
the utility model provides a converter flue gas processing system adopts the defeated grey machine of spiral to unload grey operation to with the design of the defeated grey machine of this spiral for heat exchange structure, but make full use of dust removal ash waste heat avoids the thermal waste of dust removal ash, improves converter flue gas processing system's operation economic nature and feature of environmental protection effectively.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an ash discharge system provided by an embodiment of the present invention;
fig. 2 and fig. 3 are two schematic structural diagrams of the first spiral ash conveyor provided by the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are described below clearly and completely, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1-3, an embodiment of the present invention provides a converter flue gas treatment system, which includes a flue gas dust removal device and an ash discharge system, the ash discharging system comprises an ash bin 1, a main ash discharging device 22 and an ash discharging main pipe 21 which connects the ash bin 1 and the main ash discharging device 22, an ash discharging control valve is arranged on the ash discharging main pipe 21, the ash discharging port of the flue gas dust removal device is connected with the ash bin 1 through a dry ash transfer unit, the main ash discharging device 22 comprises a first spiral ash conveyor 221, the feed inlet of the first spiral ash conveyor 221 is connected with the ash discharge main pipe 21, the main shaft and/or the spiral blades of the first spiral ash conveyor 221 are hollow and connected with a first heat exchange medium pipeline, and/or a first heat exchange sleeve is sleeved on the periphery of the shell of the first spiral ash conveyor 221, and the first heat exchange sleeve is connected with a second heat exchange medium pipeline.
The flue gas dust removal device can be a coarse dust remover such as a gravity dust remover connected to the outlet end of the evaporative cooling flue (generally between the evaporative cooling flue and the waste heat boiler), and can also be a bag dust remover or an electric dust remover used in subsequent fine dust removal. The dust generated in the operation process of the flue gas dust removal device can be discharged through the dry dust-free dust discharging system. The dry ash transfer unit can be in a pneumatic conveying mode and the like, which is conventional equipment in the field, and the specific structure is not described herein.
The ash bin 1 is used for receiving and storing 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 level indicator for detecting the level of the ash in the bin, wherein the level indicator can be a radar level indicator or the like.
It can be understood that the ash discharge main pipe 21 is connected with an ash discharge port of the ash bin 1; the ash discharge control valve can adopt a conventional ash discharge valve, and the on-off of the ash discharge main pipe 21 can be controlled through the ash discharge control valve.
The main ash discharge device 22 is used for performing ash discharge operations, such as discharging dry ash onto the ash cart 4. The first spiral ash conveyor 221 may adopt a conventional spiral conveyor structure, and generally includes a housing, a main shaft, a spiral blade disposed on the main shaft, and a driving motor for driving the main shaft to rotate, and the specific structure is not described in detail herein. In one embodiment, the first spiral ash conveyor 221 is preferably arranged horizontally, i.e. its axis is parallel to the horizontal direction, and the removed ash can descend into the first spiral ash conveyor 221 by its own weight and the material pressure in the ash bin 1.
It can be understood that, the first heat exchange medium pipeline is communicated with the main shaft and/or the hollow cavity of the helical blade of the first spiral ash conveyor 221, and can introduce a heat exchange medium into the main shaft and/or the helical blade of the first spiral ash conveyor 221; the heat exchange medium can be water or air, and the water or air after heat exchange can be used for resource utilization. Furthermore, a plurality of fins can be arranged on the spiral blade and extend into the spiral cavity, so that the heat exchange effect between the spiral blade and the dry ash can be improved; the fins can also adopt a hollow structure, so that heat exchange media can also enter the fins, and the utilization effect and efficiency of the dry ash waste heat are further improved. For the case that the main shaft 2211 and the helical blade 2212 are hollow structures, as shown in fig. 3, the driving motor 2213 may be disposed in a staggered manner with the main shaft 2211, and the two are connected by a transmission mechanism (a transmission belt, etc.) so that the transmission side of the main shaft 2211 is connected to the first heat exchange medium pipeline (for example, connected to a high temperature medium pipe in the first heat exchange medium pipeline by a rotary joint), and the other end of the main shaft 2211 extends out of the housing so as to be connected to the first heat exchange medium pipeline by a rotary joint (for the case that the second ash screw 222 is provided, the other end of the main shaft 2211 extends into the second ash screw 222 and is connected to the first heat exchange medium pipeline penetrating the second ash screw 222 by a rotary joint); of course, it is also possible to use a hollow rotating shaft for the driving motor 2213, and the hollow rotating shaft penetrates out of the housing of the driving motor 2213 so as to be connected to the first heat exchange medium pipeline.
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 spiral ash conveyor 221, so that the heat exchange effect and efficiency can be improved.
The converter flue gas treatment system that this embodiment provided adopts spiral ash conveyor to unload grey operation to with this spiral ash conveyor design for heat exchange structure, but make full use of dust removal ash waste heat, avoid the thermal waste of dust removal ash, improve converter flue gas treatment system's operation economic nature and feature of environmental protection effectively.
Further optimizing the converter flue gas treatment system, as shown in fig. 1, the main ash discharge device 22 further includes a second spiral ash conveyor 222, a discharge port of the first spiral ash conveyor 221 is connected to a feed port of the second spiral ash conveyor 222, and the second spiral ash conveyor 222 conveys ash downwards. The second spiral ash conveyer 222 may also adopt a conventional spiral conveyer structure, and is not described in detail herein.
The second spiral ash conveyor 222 is preferably arranged vertically, i.e. its axis is parallel to the vertical direction; the first spiral ash conveyor 221 and the second spiral ash conveyor 222 are preferably vertically connected, dry ash can descend into the first spiral ash conveyor 221 by means of self weight and material pressure in the ash bin 1, the first spiral ash conveyor 221 stably and reliably conveys the dry ash to the second spiral ash conveyor 222, and the second spiral ash conveyor 222 stably and reliably discharges the dry ash to the ash conveying vehicle 4. Of course, the structure is not limited to the above, for example, the axis of the first spiral ash conveyor 221 is at an angle with the horizontal plane and the first spiral ash conveyor 221 conveys ash downwards, and the axis of the second spiral ash conveyor 222 may also be at an angle with the vertical direction for easy arrangement.
Further preferably, as shown in fig. 1, the main ash discharging device 22 further comprises a lifting driving unit 226, the feeding port of the first spiral ash conveyor 221 is connected with the ash discharging main pipe 21 through a flexible hose 227, the first spiral ash conveyor 221 and the second spiral ash conveyor 222 are combined into an integral structure, and the lifting driving unit 226 is connected with the integral structure. The first spiral ash conveyor 221 and the second spiral ash conveyor 222 are preferably welded together to form the integrated structure, or the first spiral ash conveyor 221 and the second spiral ash conveyor 222 are mounted on the same structural plate, so that the first spiral ash conveyor and the second spiral ash conveyor can lift and descend simultaneously; the casing of the first spiral ash conveyor 221 is preferably welded to the casing of the second spiral ash conveyor 222, so that the airtightness of the two machines during ash conveying is guaranteed, and the strength and other properties of the integrated structure are good.
The lifting driving unit 226 is used for driving the first spiral ash conveyor 221 and the second spiral ash conveyor 222 to ascend or descend in an integrated structure, and the lifting driving unit 226 may employ a conventional lifting driving device, such as a cylinder/a hydraulic cylinder, etc., in this embodiment, as shown in fig. 1, a hoisting lifting device is employed, so that a large lifting driving stroke can be obtained in a limited space. Alternatively, as shown in fig. 1, the lifting driving unit 226 is connected to the second spiral ash conveyer 222; accordingly, a lifting guide rail may be disposed for the first spiral ash conveyor 221 to ensure stability of the above-described integral structure lifting motion.
The flexible hose 227 between the first spiral ash conveyor 221 and the ash discharge main pipe 21 is preferably a metal hose, which can be well adapted to the lifting movement of the first spiral ash conveyor 221; the metal hose is preferably made of weathering resistant steel to ensure the service life thereof.
In this embodiment, the combination of the first spiral ash conveyor 221 and the second spiral ash conveyor 222 can significantly reduce the secondary dust emission during the ash discharge process, compared with the ash discharge method that the dry ash falls freely; the ash conveying process is stable and reliable, and the phenomena of blockage of dry ash in a pipeline and the like can be avoided; in cooperation with the function of the lifting driving unit 226, the second spiral ash conveyor 222 can be as close to the ash truck 4 as possible (for example, the second spiral ash conveyor is connected with the ash truck 4 for unloading ash), so that no dust overflows basically during ash unloading, and the environmental protection is ensured.
Based on the characteristics of the spiral material cavity of the spiral ash conveyor, the spiral ash conveyor has a certain dry ash caching function, can better coordinate the pace difference between the production process and the ash discharging process, and can adjust the ash discharging speed through the driving motor of the spiral ash conveyor, so that the ash discharging process is easy to control. And the dust-removing ash stays in the spiral ash conveyer for a longer time and can be in close contact with the spiral blades and the like, so that a better heat exchange effect can be obtained.
In an alternative embodiment, a blowing-assisting pipe 225 is arranged on the first spiral ash conveyor 221 and/or the second spiral ash conveyor 222, and the blowing-assisting pipe 225 is connected with an inert gas supply pipe; for the above solution with the lifting driving unit 226, the blowing-assisting pipe 225 may be connected to the inert gas supply pipe through a flexible hose; as shown in fig. 1, the auxiliary blow pipe 225 is disposed at the connection between the first spiral ash conveyor 221 and the second spiral ash conveyor 222. Inert gas is blown into the ash conveying machine through the auxiliary blowing pipe 225, so that the movement of dry ash can be accelerated to improve the smoothness of ash discharge, and the concentration of toxic gas such as coal gas and the like possibly carried in the dry ash can be diluted. The inert gas supply pipe is preferably connected with a nitrogen source, namely nitrogen is adopted for blowing assistance operation, so that the environmental protection is ensured.
Further optimizing the main dust discharging device 22, as shown in fig. 1, the main dust discharging device 22 further includes a dust collecting cover 223, and the dust collecting cover 223 is sleeved on the housing of the second spiral dust conveyor 222 and covers the discharge port of the second spiral dust conveyor 222 therein. The dust collecting hood 223 can effectively collect secondary dust generated in the ash discharging process of the second spiral ash conveyor 222, and the environmental protection performance of the converter flue gas treatment system is further improved. Further preferably, as shown in fig. 1, a dust suction pipe 224 is disposed on the dust collection cover 223, the dust suction pipe 224 is connected to a dust removing mechanism through a flexible hose, the dust suction pipe 224 is disposed through the dust collection cover 223, a dust suction port of the dust suction pipe is communicated with a cover cavity of the dust collection cover 223, dust collected by the dust collection cover 223 can be sucked away through the dust suction pipe 224, and the dust removing mechanism can adopt common filtering equipment, and will not be described in detail herein.
Similarly, the main shaft and/or the helical blade of the second spiral ash conveyor 222 may be designed to be of a hollow structure and connected to a third heat exchange medium circulation pipeline, and/or a second heat exchange sleeve is sleeved on the periphery of the casing of the second spiral ash conveyor 222, and the second heat exchange sleeve is connected to a fourth heat exchange medium pipeline, and the specific arrangement structure may refer to the related content in the first spiral ash conveyor 221, which is not described herein again. According to the scheme, the residual heat of the dust can be further utilized, for example, a heat exchange medium is preheated by the second spiral dust conveyor 222 and then enters the first spiral dust conveyor 221 for heat exchange, and the heat exchange effect is better.
The temperature of dust removed ash generated in the converter flue gas treatment process is high, for example, the temperature of the coarse ash generated in coarse dust removal equipment at the downstream of a vaporization cooling flue is generally about 150 ℃; or when the temperature of the flue gas at the outlet of the evaporative cooler is controlled to be about 250 ℃, the temperature of the collected coarse ash can be as high as more than 200 ℃; for example, the fine ash produced by an electric dust collector is generally at a temperature of about 80 ℃. Therefore, the heating effect of the heat exchange medium can be ensured, when the ash bin 1 discharges ash with the coarse ash temperature of 150-200 ℃, the air can be heated to 45-75 ℃ when the heat exchange medium adopts air, and the water can be heated to 60-80 ℃ when the heat exchange medium adopts water (the heat exchange medium is preheated by the second spiral ash conveyor 222 and then enters the first spiral ash conveyor 221 for heat exchange).
The heated heat exchange medium can be utilized. In one embodiment, the converter flue gas treatment system further includes a gas cooler, a switching station, a bleeding chimney, and a gas tank, the flue gas pipeline is sequentially connected to the flue gas dust removal device, the gas cooler, and the switching station, and an outlet of the switching station is connected to the bleeding chimney through a first flue gas branch and to the gas tank through a second flue gas branch. In the preposed scheme of the gas cooler, if the smoke moves to the gas cooler, the switching station and the diffusing chimney, the air can be heated by utilizing the residual heat of the dedusting ash, the heated hot air is mixed into the diffusing smoke, and the temperature of the diffusing smoke is increased so as to reduce the generation of white fog at the outlet of the diffusing chimney; correspondingly, each heat exchange medium pipeline comprises a low-temperature medium pipe and a high-temperature medium pipe, one end of the low-temperature medium pipe is connected with the air blower, the other end of the low-temperature medium pipe is connected with the corresponding spiral ash conveying machine, one end of the high-temperature medium pipe is connected with the corresponding spiral ash conveying machine, the other end of the high-temperature medium pipe is connected with the first flue gas branch, and cold air blown by the air blower is mixed into the first flue gas branch through the high-temperature medium pipe after exchanging heat with the dedusting ash.
In another embodiment, the converter flue gas treatment system adopts a waste heat boiler to recover the waste heat of the converter flue gas; the waste heat of the dedusting ash can be used for heating condensed water or feed water in a water circulation system of the waste heat boiler so as to reduce the energy consumption of the waste heat boiler in operation; correspondingly, a heat exchanger can be arranged between the condenser and the deaerator of the waste heat boiler, the high-temperature medium pipe is designed to be connected to the heat exchanger, or a pipeline between the condenser and the deaerator of the waste heat boiler is designed to be connected with the first spiral ash conveyor 221, condensed water directly flows through the first spiral ash conveyor 221, and the heat exchange effect is better.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a converter flue gas processing system, includes flue gas dust collector and ash unloading system, the ash unloading system includes grey storehouse, main ash unloading device and connects grey storehouse with the main ash unloading of ash unloading device is responsible for, in the ash unloading is responsible for and is equipped with the ash unloading control valve, flue gas dust collector's the ash unloading mouth through dry ash transport unit with the ash storehouse is connected, its characterized in that: the main ash discharging device comprises a first spiral ash conveyor, a feed inlet of the first spiral ash conveyor is connected with an ash discharging main pipe, a main shaft and/or spiral blades of the first spiral ash conveyor are of a hollow structure and are connected with a first heat exchange medium pipeline, and/or a first heat exchange sleeve is sleeved on the periphery of a shell of the first spiral ash conveyor and is connected with a second heat exchange medium pipeline.
2. The converter flue gas treatment system of claim 1, wherein: the main ash discharging device further comprises a second spiral ash conveyer, a discharge hole of the first spiral ash conveyer is connected with a feed hole of the second spiral ash conveyer, and the second spiral ash conveyer conveys ash downwards.
3. The converter flue gas treatment system of claim 2, wherein: the main shaft and/or the helical blades of the second spiral ash conveyor are of a hollow structure and are connected with a third heat exchange medium circulation pipeline, and/or a second heat exchange sleeve is sleeved on the periphery of a shell of the second spiral ash conveyor and is connected with a fourth heat exchange medium pipeline.
4. The converter flue gas treatment system of claim 2, wherein: the main ash discharging device further comprises a lifting driving unit, a feeding hole of the first spiral ash conveyer is connected with the ash discharging main pipe through a flexible hose, the first spiral ash conveyer and the second spiral ash conveyer are combined into an integral structure, and the lifting driving unit is connected with the integral structure.
5. The converter flue gas treatment system of claim 2, wherein: the axis of the first spiral ash conveyor is parallel to the horizontal direction, and the axis of the second spiral ash conveyor is parallel to the vertical direction.
6. The converter flue gas treatment system of claim 2, wherein: the main ash discharging device also comprises a dust hood which is sleeved on the shell of the second spiral ash conveyer and is used for arranging a discharge port cover of the second spiral ash conveyer.
7. The converter flue gas treatment system of claim 6, wherein: the dust hood is provided with a dust extraction pipe, and the dust extraction pipe is connected with a dust removal mechanism through a flexible hose.
8. The converter flue gas treatment system of claim 2, wherein: and the first spiral ash conveying machine and/or the second spiral ash conveying machine are/is provided with blowing-assisting pipes, and the blowing-assisting pipes are connected with an inert gas supply pipe.
9. The converter flue gas treatment system of claim 1, wherein: the smoke pipeline is sequentially connected with the smoke dust removal device, the gas cooler and the switching station, and an outlet of the switching station is connected with the diffusing chimney through a first smoke branch and is connected with the gas tank through a second smoke branch.
10. The converter flue gas treatment system of claim 9, wherein: the first heat exchange medium pipeline comprises a low-temperature medium pipe and a high-temperature medium pipe, the low-temperature medium pipe is connected with the air blower and the first spiral ash conveyor respectively, and the high-temperature medium pipe is connected with the first spiral ash conveyor and the first flue gas branch respectively.
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| CN202022818928.4U CN214168029U (en) | 2020-11-30 | 2020-11-30 | Converter flue gas processing system |
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| CN202022818928.4U CN214168029U (en) | 2020-11-30 | 2020-11-30 | Converter flue gas processing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112593041A (en) * | 2020-11-30 | 2021-04-02 | 中冶南方工程技术有限公司 | Converter flue gas processing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112593041A (en) * | 2020-11-30 | 2021-04-02 | 中冶南方工程技术有限公司 | Converter flue gas processing system |
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