CN113304557B - Dust removal system and dust removal method for primary flue gas of converter steelmaking - Google Patents
Dust removal system and dust removal method for primary flue gas of converter steelmaking Download PDFInfo
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- CN113304557B CN113304557B CN202110479359.1A CN202110479359A CN113304557B CN 113304557 B CN113304557 B CN 113304557B CN 202110479359 A CN202110479359 A CN 202110479359A CN 113304557 B CN113304557 B CN 113304557B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0039—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices
- B01D46/0041—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices for feeding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2411—Filter cartridges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
- B01D46/58—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in parallel
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
- C21C5/40—Offtakes or separating apparatus for converter waste gases or dust
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- Chemical Kinetics & Catalysis (AREA)
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- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The invention discloses a dust removal system and a dust removal method for primary flue gas of converter steelmaking. The dust removal system has at least two dust removers that connect in parallel and to inputing the air intake system of dirty gas in the dust remover, and air intake system includes: a main pipe arranged along the arrangement direction of the dust collectors; the air inlet end of the branch pipe is connected with the main pipe, and the cross section size of the air inlet end of the branch pipe is larger than that of the air outlet end of the branch pipe; the air outlet end of the air inlet pipe is connected with the air inlet of the corresponding dust remover, the axis of the air inlet pipe is not perpendicular to the axis of the dust remover, and the cross section size of the air outlet end of the air inlet pipe is larger than that of the air inlet end; the dust-containing gas flows through the main pipe, the branch pipe and the air inlet pipe in sequence and then enters the dust remover. The invention can reduce or even avoid dust deposition in the pipe, improve the fluidity of the gas, help to control the system pressure, balance the load distribution of the dust-containing gas in each dust remover, and the replacement gas can replace the dust remover more fully.
Description
Technical Field
The invention relates to the technical field of conveying of dust-containing gas, in particular to the technical field of inputting the dust-containing gas into a dust remover, and particularly relates to a dust removing system and a dust removing method of primary flue gas of converter steelmaking.
Background
At present, the distribution of an airflow field in a dust remover is researched more, but the influence on the air flow entering each dust remover barrel body is less researched in the form of an air inlet pipe structure needing a plurality of dust remover barrel bodies (or box bodies), and particularly, the research on the dust-containing gas with alternating gas flow and components, such as a converter, entering the plurality of dust remover barrel bodies is less.
The mode that the inlet manifold that the pipe diameter is homogeneous and branch pipe branch point are connected is generally adopted to the inlet structure that gets into a plurality of dust remover barrels now, adopts the main problem that exists of gas distribution of this kind of inlet structure:
1. dust is easy to settle and collect in the air inlet main pipe and the branch pipes, so that the air inlet resistance is increased, and the operation of cleaning ash in the pipes is inconvenient;
2. the dust sedimentation difference in each air inlet pipeline is large, and dust is easier to deposit on the pipeline corresponding to the middle-rear section dust remover, so that the air inlet resistance difference of each dust remover is changed, the air flow distribution entering each dust remover barrel is seriously influenced, and the load difference of each dust remover barrel is caused;
3. for primary flue gas generated in converter steelmaking, the following problems are easily caused due to the alternation of gas flow and components:
1) compared with other gases filtered, dust in the primary flue gas generated in converter steelmaking is more easily deposited on the middle and rear section pipelines at low gas flow, the gas inflow of the front end dust remover is increased, and the gas inflow of the middle and rear dust removers is reduced, so that the middle and rear portions are aggravated in sedimentation, and the load distribution of each dust remover generates larger deviation and is continuously worsened;
2) the smoke components of the primary smoke gas of converter steelmaking alternate, carbon monoxide and other flammable and explosive gases are used in the converting period of the converter, air is used in the non-converting period, in order to realize the direct mixing of the two gas components, the smoke cover of the converter is lifted at the initial stage of converting and the final stage of converting, so that the air reacts with the carbon monoxide to be converted into carbon dioxide inert gas to replace the system, and air-CO is formed, thus2-CO-CO2-circulation of air; when the recycle gas is dedusted, CO is introduced2The dust removal system is replaced and air and coal gas are isolated, so that the safety of the converter bag type dust removal system is improved; while dust deposition in the pipeline will affect CO2The air or the coal gas is completely replaced and isolated, and a blind area which is not replaced according to requirements is formed, so that the safety of the dust removal system is reduced.
Disclosure of Invention
The invention aims to provide a dust removal system capable of reducing dust deposition in a gas inlet main pipe and improving the replacement effect of replacement gas and a dust removal method for primary flue gas of converter steelmaking.
To achieve the above object, according to one aspect of the present invention, a dust removing system is provided. The technical scheme is as follows:
the dust removal system is provided with at least two dust removers connected in parallel and an air inlet system for inputting dust-containing gas into the dust removers, and the air inlet system comprises: a main pipe arranged along the arrangement direction of the dust collectors; the air inlet end of the branch pipe is connected with the main pipe, and the cross section size of the air inlet end of the branch pipe is larger than that of the air outlet end of the branch pipe; the air outlet end of the air inlet pipe is connected with the air inlet of the corresponding dust remover, the axis of the air inlet pipe is not perpendicular to the axis of the dust remover, and the cross section size of the air outlet end of the air inlet pipe is larger than that of the air inlet end; the dust-containing gas flows through the main pipe, the branch pipe and the air inlet pipe in sequence and then enters the dust remover.
Further, the axis of the air inlet pipe and the axis of the dust remover form an included angle of 50-80 degrees, preferably 60-70 degrees.
Further, the cross-sectional diameter of the inlet pipe increases progressively along the flow direction of the dust-laden gas.
Further, the gas flow speed at the gas inlet end of the gas inlet pipe is 10-20 m/s; the gas flow velocity at the gas outlet end of the gas inlet pipe is 3-5 m/s; the gas flow velocity at the gas inlet end of the main pipe is 14-20 m/s.
Further, the axis of the branch pipe is parallel to the axis of the dust remover; the cross section of the branch pipe is rectangular.
Furthermore, the branch pipe is provided with a pair of vertical plates and a pair of side plates, the vertical plates are parallel to the axis of the main pipe, the length of each vertical plate is gradually reduced along the flowing direction of dust-containing gas in the branch pipe, and the side plates are connected with the side edges of the two vertical plates.
Furthermore, at least one side plate in the branch pipes at the two ends is an inclined plate; two side plates in the branch pipe positioned in the middle are inclined plates; the air inlet ends of the side plates of the adjacent branch pipes are connected.
Furthermore, the included angle between the inclined plate and the horizontal plane is 30-75 degrees, preferably 45-65 degrees; two side plates in the branch pipe in the middle are symmetrically arranged by taking the axis of the corresponding dust remover as a symmetry axis.
Furthermore, the dust removal system also comprises a square and round reducer pipe and a bent pipe which are sequentially arranged between the branch pipe and the air inlet pipe.
In order to achieve the above object, according to another aspect of the present invention, there is provided a method for dedusting primary flue gas generated in steelmaking in a converter, wherein the method for dedusting the primary flue gas is implemented by using the dedusting system.
Therefore, the dust removal system and the dust removal method for the primary flue gas of converter steelmaking are simple in structure, firstly, the branch pipe and the air inlet pipe with special structures can reduce or even avoid dust deposition in the pipes, improve the flowability of replacement gas and dusty gas, and are beneficial to controlling system pressure and balancing load distribution of the dusty gas in each dust remover.
The invention is further described with reference to the following figures and detailed description. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to assist in understanding the invention, and are included to explain the invention and their equivalents and not limit it unduly. In the drawings:
FIG. 1 is a front view of an embodiment of the air intake structure and dust collector of the present invention.
FIG. 2 is a side view of an embodiment of the air intake structure and duster of the present invention.
FIG. 3 is a front view of an embodiment of the air intake structure and dust extraction system of the present invention.
FIG. 4 is a side view of an embodiment of the air intake structure and dust extraction system of the present invention.
FIG. 5 is a front view of an embodiment of the air induction system and dust extraction system of the present invention.
FIG. 6 is a side view of an embodiment of the air induction system and dust extraction system of the present invention.
The relevant references in the above figures are:
100-a dust remover, 110-an air inlet pipe, 120-a middle pipe, 130-an elbow, 310-a main pipe, 320-a branch pipe, 321-a vertical plate, 322-a side plate and 330-a square and round reducer.
Detailed Description
The invention will be described more fully hereinafter with reference to the accompanying drawings. Those skilled in the art will be able to implement the invention based on these teachings. Before the present invention is described in detail with reference to the accompanying drawings, it is to be noted that:
the technical solutions and features provided in the present invention in the respective sections including the following description may be combined with each other without conflict.
Moreover, the embodiments of the present invention described in the following description are generally only some embodiments of the present invention, and not all embodiments. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.
With respect to terms and units in the present invention. The terms "comprising," "having," and any variations thereof in the description and claims of this invention and the related sections are intended to cover non-exclusive inclusions.
FIG. 1 is a front view of an embodiment of an air intake structure and duster 100 of the present invention. FIG. 2 is a side view of an embodiment of the air intake structure and duster 100 of the present invention.
As shown in fig. 1-2, the air inlet structure is used for inputting dust-containing gas into the dust remover 100, and the air inlet structure is provided with an air inlet pipe 110 connected with an air inlet of the dust remover 100, and the axis of the air inlet pipe 110 is not perpendicular to the axis of the dust remover 100; the cross-sectional size of the outlet end of the inlet pipe 110 is larger than that of the inlet end. Therefore, dust in the dust-containing gas can more easily fall into the dust collector 100, and the dust is less likely to deposit in the air inlet pipe 110.
When the included angle A between the axis of the air inlet pipe 110 and the axis of the dust remover 100 is 30-75 degrees, especially the included angle A is 45-65 degrees, the dust remover can not only help to prevent dust deposition, but also facilitate the installation of the air inlet pipe 110; in specific implementation, the included angle a between the axis of the air inlet pipe 110 and the axis of the dust remover 100 is any one of or other values of 30 °, 35 °, 40 °, 45 °, 55 °, 60 °, 65 °, 70 °, and 75 °.
The diameter of the cross section of the air inlet pipe 110 increases progressively along the flowing direction of the dust-containing gas, that is, the air inlet pipe 110 is in an integrated taper pipe shape, and the air outlet end of the air inlet pipe 110 is cut into the dust remover 100 in a form of gradually expanding from the air inlet end, so that dust is less prone to deposit.
In order to facilitate the connection to the incoming gas line for the transport of gas, the gas inlet structure further comprises a central tube 120, which, when said central tube 120 is arranged vertically, prevents the deposition of dust inside the central tube 120. Because the middle pipe 120 and the air inlet pipe 110 are not perpendicular to each other, in order to facilitate the connection between the middle pipe 120 and the air inlet pipe 110, the air inlet structure further includes an elbow 130, and two ends of the elbow 130 are respectively connected with the air inlet pipe 110 and the middle pipe 120.
When the dust remover 100 with the gas inlet structure is used for removing dust from primary flue gas generated in converter steelmaking, the gas inlet pipe 110 has the advantage of difficult dust deposition, and due to the gradual expansion structure of the gas inlet pipe 110, gas enters the dust remover in a low-speed and diffusion state, so that the flow field distribution of the dust-containing gas entering the dust remover 100 is more uniform, and the replacement gas can replace the dust remover 100 more fully, thereby being beneficial to improving the safety.
FIG. 3 is a front view of an embodiment of the air intake structure and dust extraction system of the present invention. FIG. 4 is a side view of an embodiment of the air intake structure and dust extraction system of the present invention.
As shown in fig. 3-4, the air inlet structure is used for inputting dust-containing gas into at least two parallel dust collectors 100, and comprises a main pipe 310 and a branch pipe 320; the main pipe 310 is arranged along the arrangement direction of the dust collector 100; the branch pipe 320 communicates the main pipe 310 with the corresponding air inlet of the dust collector 100; the cross-sectional size of the inlet end of the branch pipe 320 is larger than that of the outlet end. Therefore, the inlet end of the branch pipe 320 is large, so that the dust is not easy to deposit in the main pipe 310, and the cross section size of the inlet end is larger than that of the outlet end, so that the dust is not easy to deposit in the branch pipe 320, and therefore, the plurality of dust collectors 100 can stably and uniformly distribute the load for a long time, and the stable dust collection effect is maintained.
The axis of the branch pipe 320 is parallel to the axis of the dust separator 100, since settling of dust is more facilitated.
The branch pipes 320 have a rectangular cross-section, which facilitates manufacturing and installation. In specific implementation, the branch pipe 320 has a pair of vertical plates 321 and a pair of side plates 322, the vertical plates 321 are parallel to the axis of the main pipe 310, the length of the vertical plates 321 decreases along the flowing direction of dust-containing gas in the branch pipe 320, and the side plates 322 are connected to the side edges of the two vertical plates 321.
At least one side plate 322 of the branch pipes 320 positioned at the two ends is an inclined plate, two side plates 322 of the branch pipes 320 positioned at the middle part are both inclined plates and are symmetrically arranged by taking the axis of the corresponding dust collector 100 as a symmetry axis, and the air inlet ends of the side plates 322 of the adjacent branch pipes 320 are connected. Thus, it is possible to maximally reduce dust deposited in the main pipe 310 while ensuring that no dust is deposited in the branch pipes 320.
When the included angle B between the inclined plate and the horizontal plane is 50-80 degrees, particularly 60-70 degrees, the dust deposition can be prevented, and the installation of the main pipe 310 and the branch pipe 320 is facilitated; in specific implementation, the included angle B between the inclined plate and the horizontal plane is any one of 50 °, 55 °, 60 °, 65 °, 70 °, 75 ° and 80 ° or other numerical values.
In order to facilitate the introduction of the dust-containing gas in the branch pipe 320 into the dust collector 100, the air inlet structure further comprises a square-round reducer pipe 330 disposed at the air outlet end of the branch pipe 320.
When the dust removal system with the air inlet structure is used for removing dust from primary flue gas generated in converter steelmaking, dust deposition in the main pipe 310 and the branch pipes 320 can be reduced or even avoided, load distribution of the primary flue gas generated in converter steelmaking in each dust remover 100 is balanced, and the continuous change of the primary flue gas flow generated in converter steelmaking can be adapted.
FIG. 5 is a front view of an embodiment of the air induction system and dust extraction system of the present invention. FIG. 6 is a side view of an embodiment of the air induction system and dust extraction system of the present invention.
As shown in fig. 5-6, the dust removing system has at least two dust collectors 100 connected in parallel and an air inlet system for inputting dust-containing gas into the dust collectors 100, and the air inlet system includes an air inlet pipe 110 in the first air inlet structure shown in fig. 1-2 and a main pipe 310 and a branch pipe 320 in the second air inlet structure shown in fig. 3-4; in order to facilitate the butt joint of the first air inlet structure and the second air inlet structure, the dust removing system further comprises a square-round reducer 330 and an elbow 130 which are sequentially arranged between the branch pipe 320 and the air inlet pipe 110. Therefore, the air inlet system has the advantages of the two air inlet structures.
Especially, when the dedusting system is used for dedusting primary flue gas of converter steelmaking, the method not only helps to improve the flow field distribution of dust-containing gas in the dedusters and balance the load distribution of the dust-containing gas in each deduster 100, but also can ensure that the replacement gas can more fully replace the interior of the dedusters 100, has excellent adaptability to the alternation of gas quantity and components of the primary flue gas of converter steelmaking, and helps to improve the safety.
The gas flow speed at the gas inlet end of the gas inlet pipe 110 is 10-20 m/s; the gas flow velocity at the gas outlet end of the gas inlet pipe 110 is 3-5 m/s; the gas flow rate at the inlet end of the main pipe 310 is 14-20 m/s. It can be seen that the divergent air inlet pipe 110 not only enables the air to enter the interior of the dust remover in a diffusion manner, but also enables the flow velocity of the air to be naturally reduced, and for the dust-containing air, the flow field distribution of the dust-containing air in the dust remover can be obviously improved, and for the replacement air, the replacement effect can be obviously improved, dead angles are reduced, and safety is improved.
The dust collector 100 is a filtering device for physically intercepting the particles in the dust-containing gas, such as a bag filter and a metal tube filter. The cross-sectional shape of the cylinder of the duster 100 may be circular or rectangular.
The contents of the present invention have been explained above. Those skilled in the art will be able to implement the invention based on these teachings. All other embodiments, which can be derived by a person skilled in the art from the above description without inventive step, shall fall within the scope of protection of the present invention.
Claims (12)
1. The dust removal system is provided with at least two dust removers (100) connected in parallel and an air inlet system for inputting dust-containing gas into the dust removers (100), and is characterized in that: the air intake system includes:
a main pipe (310), the main pipe (310) being arranged in the arrangement direction of the dust collector (100);
the air inlet end of the branch pipe (320) is connected with the main pipe (310), and the cross section size of the air inlet end of the branch pipe (320) is larger than that of the air outlet end;
the air outlet end of the air inlet pipe (110) is connected with the air inlet of the corresponding dust remover (100), the axis of the air inlet pipe (110) is not perpendicular to the axis of the dust remover (100), and the cross section size of the air outlet end of the air inlet pipe (110) is larger than that of the air inlet end;
the dust-containing gas flows through the main pipe (310), the branch pipe (320) and the air inlet pipe (110) in sequence and then enters the dust remover (100).
2. The dusting system of claim 1, wherein: the included angle between the axis of the air inlet pipe (110) and the axis of the dust remover (100) is 30-75 degrees.
3. The dusting system of claim 2, wherein: the included angle between the axis of the air inlet pipe (110) and the axis of the dust remover (100) is 45-65 degrees.
4. The dusting system of claim 1, wherein: the cross-sectional diameter of the inlet pipe (110) increases progressively in the flow direction of the dust-laden gas.
5. The dusting system of claim 1, wherein: the gas flow speed at the gas inlet end of the gas inlet pipe (110) is 10-20 m/s; the gas flow velocity at the gas outlet end of the gas inlet pipe (110) is 3-5 m/s; the gas flow speed at the gas inlet end of the main pipe (310) is 14-20 m/s.
6. The dusting system of claim 1, wherein: the axis of the branch pipe (320) is parallel to the axis of the dust remover (100); the branch pipes (320) have a rectangular cross section.
7. The dusting system of claim 6, wherein: the branch pipe (320) is provided with a pair of vertical plates (321) and a pair of side plates (322), the vertical plates (321) are parallel to the axis of the main pipe (310), the length of each vertical plate (321) decreases progressively along the flowing direction of the dust-containing gas in the branch pipe (320), and the side plates (322) are connected with the side edges of the two vertical plates (321).
8. The dusting system of claim 7, wherein: at least one side plate (322) of the branch pipes (320) positioned at the two ends is an inclined plate; two side plates (322) in the branch pipe (320) positioned in the middle are inclined plates; the air inlet ends of the side plates (322) of the adjacent branch pipes (320) are connected.
9. The dusting system of claim 8, wherein: the inclined plate and the horizontal plane form an included angle of 50-80 degrees; two side plates (322) in the branch pipe (320) positioned in the middle are symmetrically arranged by taking the axis of the corresponding dust remover (100) as a symmetry axis.
10. The dusting system of claim 9, wherein: the inclined plate and the horizontal plane form an included angle of 60-70 degrees.
11. The dusting system of claim 1, wherein: the dust removal system also comprises a square and round reducer pipe (330) and a bent pipe (130) which are sequentially arranged between the branch pipe (320) and the air inlet pipe (110).
12. The method for dedusting primary flue gas generated in converter steelmaking is characterized by comprising the following steps of: treating said primary flue gas with a dedusting system as set forth in one of claims 1-11.
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| 燃煤电站锅炉尾部烟道流场数值模拟分析及改造;卢权等;《热能动力工程》;20171220(第12期);第74-80、147-148页 * |
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| CN113304557A (en) | 2021-08-27 |
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