CN109439821B - Blast furnace top gas bleeding system - Google Patents
Blast furnace top gas bleeding system Download PDFInfo
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- CN109439821B CN109439821B CN201811594752.XA CN201811594752A CN109439821B CN 109439821 B CN109439821 B CN 109439821B CN 201811594752 A CN201811594752 A CN 201811594752A CN 109439821 B CN109439821 B CN 109439821B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/002—Evacuating and treating of exhaust gases
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/007—Controlling or regulating of the top pressure
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/22—Dust arresters
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- Manufacturing & Machinery (AREA)
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Abstract
The invention relates to a blast furnace top gas bleeding system, which comprises a gas rising pipeline, wherein the gas rising pipeline is connected with a gas recovery pipeline and at least one furnace gas bleeding pipeline, and a furnace gas bleeding valve is arranged at the terminal of the furnace gas bleeding pipeline. The blast furnace top gas bleeding system also comprises a dust chamber, wherein an exhaust passage is arranged on the dust chamber, an internal spraying mechanism for spraying water into a chamber cavity of the dust chamber is arranged in the dust chamber, and each furnace gas bleeding valve is contained in the dust chamber. According to the blast furnace top gas bleeding system provided by the invention, each furnace gas bleeding valve is surrounded by the dust removal chamber, and the inner spraying mechanism is arranged in the dust removal chamber, so that the gas discharged into the dust removal chamber is washed and dedusted, the cleanliness of the bled gas is improved, and the particulate pollution caused by gas bleeding is reduced.
Description
Technical Field
The invention belongs to the technical field of blast furnace production, and particularly relates to a blast furnace top gas diffusion system.
Background
At present, the top gas of a blast furnace is diffused mainly under the following conditions:
one part of the coal gas comes from the diffused coal gas in the pressure equalizing and diffusing system. Earlier built blast furnaces, for historical reasons, weighed the pressure-equalizing gas in the tank and discharged directly to the atmosphere; blast furnaces constructed in recent years have taken recycling measures due to cost pressure and environmental pressure.
Another part of the emissions from the blast furnace during the downdraft: (1) planning a damping-down situation, wherein in the early stage of dispersion, the gas pressure is higher than that in the prior stage, a recycling measure is adopted, and when the gas pressure is reduced to 30-15 kPa, in order to improve the gas discharge speed and reduce the damping-down time, low-pressure gas is often diffused into the atmosphere through a furnace top furnace gas diffusion valve 25, so that higher noise and particulate pollution are caused; (2) when the damping down is planned, the situation is urgent, the pressure in the furnace body 1 is required to be quickly reduced, the furnace top furnace gas bleeding valve 25 is usually directly opened to discharge coal gas into the atmosphere, the coal gas flow is particularly high, and serious noise and particulate pollution are brought in the discharge process.
As shown in figure 1, coal gas generated in the production process of a blast furnace body 1 is converged to an ascending confluence pipe 23 through a first ascending pipe 21 and a second ascending pipe 22, three diffusing pipelines are connected to the ascending confluence pipe 23, a furnace gas diffusing valve 25 is arranged on the diffusing pipelines, and the ascending confluence pipe 23 is connected to a coal gas descending pipe 24 in a turning way and is connected to a dust removal recycling system of the blast furnace. When the damping down is planned, firstly starting a recovery system to recover the high-pressure coal gas in the furnace body 1, and when the pressure in the furnace is reduced to 30-15 kPa, opening a furnace top and furnace gas diffusion furnace 25 to directly discharge the coal gas to the atmosphere in order to improve the discharge speed of the coal gas and reduce the damping down time; when the planned damping down and the pressure in the furnace are ultrahigh, the furnace top and furnace gas diffusion furnace 25 is directly opened, and the coal gas is directly discharged to the atmosphere;
for a newly-built blast furnace, a pressure-equalizing diffused gas recycling system is arranged due to the pressure of environmental protection and cost. The process is as follows: when pressure equalization is needed in the weighing tank 11, the high-pressure gas in the pressure equalization gas source pipe 63 provides pressure gas into the weighing tank 11 through a pipeline, so that the pressure in the tank is increased. When the pressure in the tank is required to be reduced, the pressure gas in the weighing tank 11 is connected to a pressure equalizing and bleeding gas recovery system 64 through a pressure equalizing and bleeding pipe 61 of the weighing tank, and the gas is recycled.
For some older blast furnaces, the uniform bleeding gas recovery system 64 is not provided, and it is common practice to vent the gas directly to the atmosphere through the pressure equalizing bleeding pipe 61 by opening the pressure equalizing bleeding valve 62.
In the above situations, the discharged gas can cause serious noise pollution and particulate pollution, i.e. the common blast furnace emits black smoke and yellow smoke.
Disclosure of Invention
The embodiment of the invention relates to a blast furnace top gas diffusion system which can at least solve part of defects in the prior art.
The embodiment of the invention relates to a blast furnace top gas bleeding system which comprises a gas rising pipeline, wherein the gas rising pipeline is connected with a gas recovery pipeline and at least one furnace gas bleeding pipeline, a furnace gas bleeding valve is arranged at the terminal of the furnace gas bleeding pipeline, the blast furnace top gas bleeding system also comprises a dust chamber, an exhaust channel is arranged on the dust chamber, an internal spraying mechanism for spraying water into a chamber cavity of the dust chamber is arranged in the dust chamber, and each furnace gas bleeding valve is contained in the dust chamber.
In one embodiment, at least one wall plate of the dust chamber is a micro-perforated plate and forms the exhaust channel.
As one embodiment, the outer side of each micro-perforated plate is provided with an outer spraying mechanism for spraying water to the perforated area.
As one embodiment, a water collecting tray is arranged below the dust removing chamber.
In one embodiment, the water receiving tray is connected to a water collecting tank through a water return pipe, a filtering mechanism is arranged in the water collecting tank, a water supply pipe connected to a corresponding spraying mechanism is arranged on a clean water side in the tank, and a water supply pump is arranged on the water supply pipe.
In one embodiment, a partition board is arranged in the water collecting tank and divides the space in the tank into a water return compartment and a water supply compartment, the water return pipe is communicated with the water return compartment, the water supply pipe is communicated with the water supply compartment, an overflow channel is arranged on the partition board, and a filter screen is arranged at the overflow channel.
As one embodiment, the blast furnace top gas diffusion system further comprises an expansion chamber, wherein a diffusion channel is arranged on the expansion chamber, and the dust removal chamber is arranged in the expansion chamber.
In one embodiment, at least one muffler is disposed on the expansion chamber, and an airflow channel of the muffler forms the diffusion channel.
In one embodiment, the wall plate of the expansion chamber is a hollow plate, and an acoustic panel is sandwiched in a hollow cavity of the wall plate.
As one embodiment, the blast furnace top gas bleeding system further comprises a pressure-equalizing bleeding pipeline connected with the weighing tank, wherein a pressure-equalizing bleeding valve is arranged on the pressure-equalizing bleeding pipeline, and the outlet end of the pressure-equalizing bleeding pipeline extends into the dust removal chamber.
The embodiment of the invention at least has the following beneficial effects:
according to the blast furnace top gas bleeding system provided by the invention, each furnace gas bleeding valve is surrounded by the dust removal chamber, and the inner spraying mechanism is arranged in the dust removal chamber, so that the gas discharged into the dust removal chamber is washed and dedusted, the cleanliness of the bled gas is improved, and the particulate pollution caused by gas bleeding is reduced.
The embodiment of the invention further has the following beneficial effects:
the wall plate of the dust chamber is arranged as a micro-perforated plate, so that the noise generated by gas emission can be reduced, and the noise pollution is improved.
The embodiment of the invention further has the following beneficial effects:
through setting up outer spraying mechanism, wash the dust removal to the coal gas of following the clean room exhaust, improve the clean degree of diffusing coal gas, reduce the particulate matter pollution that coal gas diffuses, can prevent the microperforated panel moreover and block up.
The embodiment of the invention further has the following beneficial effects:
by arranging the expansion chamber, particularly arranging the silencer on the expansion chamber, the noise of the diffused coal gas can be further reduced, and the noise pollution of the diffused coal gas can be improved.
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 a prior art blast furnace top gas bleeding system provided in the background art;
fig. 2 is a schematic structural diagram of a blast furnace top gas diffusion system provided by the embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2, an embodiment of the present invention provides a blast furnace top gas bleeding system, which includes a gas rising line connected to a gas recovery line 24 and at least one gas bleeding line, the gas bleeding line being terminated with a gas bleeding valve 25, and generally, the gas rising line includes a first rising pipe 21, a second rising pipe 22 and a rising converging pipe 23, the first rising pipe 21 and the second rising pipe 22 are both connected to a blast furnace body 1, and the outlet ends are both connected to the rising converging pipe 23; in this embodiment, there are three furnace gas bleeding pipelines, that is, there are three corresponding furnace gas bleeding valves 25.
Further, as shown in fig. 2, the blast furnace top gas bleeding system further comprises a dust chamber 3, an exhaust passage is arranged on the dust chamber 3, an internal spraying mechanism 42 for spraying water into a chamber cavity of the dust chamber 3 is arranged in the dust chamber 3, and each bleeding valve is contained in the dust chamber 3. The inner spraying mechanism 42 may adopt a conventional atomizing nozzle for dust removal, wherein, one atomizing nozzle may be respectively arranged above each furnace gas blow-off valve 25, and the number and the spacing of the atomizing nozzles are selected according to the spaciousness degree of the dust chamber 3.
According to the blast furnace top gas diffusion system provided by the invention, the gas diffusion valves 25 are surrounded in the dust chamber 3, and the inner spraying mechanism 42 is arranged in the dust chamber 3, so that the gas discharged into the dust chamber 3 is washed and dedusted, the cleanliness of the diffused gas is improved, and the particulate pollution caused by gas diffusion is reduced.
Furthermore, at least one wall plate of the dust chamber 3 is a micro-perforated plate 31, which can reduce the noise generated by the coal gas emission and improve the noise pollution, i.e. the dust chamber 3 can also play a role of a silencing chamber. The microperforated panel 31 is of conventional sound damping construction, i.e., it is formed with a plurality of small holes in a plate, preferably a thin steel plate.
Preferably, as shown in fig. 2, the clean room 3 is a square box structure, and the wall plates on the left and right sides/front, back, left and right sides are designed to be micro-perforated plates 31. After being discharged from each furnace gas blow-off valve 25, the coal gas moves to the left side/the right side/the periphery of the dust removal chamber 3, so that the retention time of the coal gas in the dust removal chamber 3 can be prolonged, on one hand, the silencing effect can be improved, and on the other hand, the dust removal effect can be improved.
Further preferably, as shown in fig. 2, an outer spraying mechanism 41 for spraying water to the opening area of each of the microperforated plates 31 is provided on the outer side thereof, and the outer spraying mechanism 41 may be a conventional atomizing nozzle for dust removal. Through setting up outer spraying mechanism 41, wash the dust removal to the coal gas of following the clean room 3 exhaust, improve the clean degree of the gas of diffusing, reduce the particulate matter pollution that the coal gas diffuses, can prevent in addition that microperforated panel 31 from blockking up.
Further, based on the above structure provided with the spraying mechanism, as shown in fig. 2, a water receiving tray 43 is arranged below the dust chamber 3 for receiving water flowing down after the coal gas is washed. The shower water in the dust chamber 3 may flow out from the microperforated plates 31 on both sides, or a plurality of return holes may be provided in the bottom plate of the dust chamber 3.
The washing water received by the water receiving tray 43 can be reused to reduce the consumption of the spraying water. Correspondingly, as shown in fig. 2, the water receiving tray 43 is connected to a water collecting tank 44 through a water return pipe, a filtering mechanism is arranged in the water collecting tank 44, a water supply pipe connected to a corresponding spraying mechanism is arranged on a clean water side in the tank, and a water supply pump 45 is arranged on the water supply pipe. The filtering mechanism is used for filtering out dust and the like in the washing water, so that the blockage of an atomizing nozzle and the like is avoided; which may employ conventional filtering equipment such as a filter screen 442. In one embodiment, as shown in fig. 2, a partition plate 441 is disposed in the water collecting tank 44 and divides the space in the tank into a water return compartment and a water supply compartment, the water return pipe is communicated with the water return compartment, the water supply pipe is communicated with the water supply compartment, an overflow channel is disposed on the partition plate 441, and a filter screen 442 is disposed at the overflow channel; the partition 441 may be in contact with the top of the water collecting tank 44 and the overflow hole may be formed in the body of the partition 441, or it may not be in contact with the top of the water collecting tank 44, so that the space between the partition and the top of the water collecting tank 44 serves as an overflow path.
Further optimizing the structure of the blast furnace top gas diffusion system, as shown in fig. 2, the blast furnace top gas diffusion system further comprises an expansion chamber 5, a diffusion channel is arranged on the expansion chamber 5, and the dust removal chamber 3 is arranged in the expansion chamber 5. When the diffused coal gas is discharged from the dust removing chamber 3 and enters the expansion chamber 5, the volume is expanded, and the purposes of noise reduction and dust removal can be further achieved. Preferably, at least one muffler 51 is disposed on the expansion chamber 5, the airflow channel of the muffler 51 forms the diffusing channel, and the muffler 51 may adopt conventional channel-type muffling equipment, such as the above-mentioned micro-perforated plate muffler and tubular muffler, which are commercially available and the specific structure of which is not described herein. Obviously, the muffler 51 provided on the expansion chamber 5 can further function to reduce noise.
As shown in fig. 2, the expansion chamber 5 is also preferably a square box structure, and the muffler 51 may be provided on a side wall of the expansion chamber 5, on both left and right side walls, or on four side walls, front, rear, left, and right.
Further, as shown in fig. 2, the wall plate of the expansion chamber 5 is a hollow plate, and a noise reduction plate 52 is interposed in the hollow cavity of the wall plate, thereby improving the noise reduction effect of the expansion chamber 5. Each wall plate of the expansion chamber 5 is preferably a laminated structure of two steel plates, an inner one and an outer one, with the muffler plate 52 sandwiched therebetween.
Preferably, the expansion chamber 5 and the dust removal chamber 3 are detachable structures, so that the installation and maintenance are convenient. For example, a quick mounting and dismounting mechanism is arranged between six side wall plates of the expansion chamber 5, and can be in bolt connection or buckle connection; the same structure of the dust chamber 3 can be adopted, and the detailed description is omitted here.
The structure of the blast furnace top gas bleeding system is further optimized, as shown in fig. 2, the blast furnace top gas bleeding system further comprises a pressure-equalizing bleeding pipeline 61 connected with the weighing tank 11, a pressure-equalizing bleeding valve 62 is arranged on the pressure-equalizing bleeding pipeline 61, the outlet end of the pressure-equalizing bleeding pipeline 61 extends into the dust removal chamber 3, and the noise-reducing and dust-removing effects on the blast furnace pressure-equalizing bleeding gas can be achieved by means of the noise-reducing and dust-removing structure. Dust removing equipment such as a cyclone 65 may be provided between the pressure equalizing and bleeding valve 62 and the weighing tank 11 in the pressure equalizing and bleeding line 61.
The specific working process of the blast furnace top gas diffusion system is as follows:
(1) for the blast furnace that does not set up the pressure-equalizing and diffuses the coal gas recovery system, according to its pressure-equalizing and diffuses the operation flow, the weighing tank 11 puts forward and diffuses the decompression requirement, opens pressure-equalizing and diffuses valve 62, starts working shaft 45 simultaneously, to the microperforated panel 31 water spray in the clean room 3 and on the clean room 3, coal gas gets into 5 in-process in the expansion chamber from the clean room 3, is removed dust and is fallen the noise. Then, the noise is reduced again through the expansion chamber 5 and the silencer 51, so that the purposes of dust removal and noise reduction are achieved.
(2) Aiming at the conditions of planned damping down and reduction of pressure in the furnace body 1, a recovery system is started, high-pressure coal gas in the furnace body 1 is quickly recovered, when the pressure is reduced to 30-15 KPa, the recovery speed is reduced, in order to improve the discharge speed of the coal gas in the furnace body 1 and reduce damping down time, a blast furnace gas recovery and utilization system connected with a coal gas recovery pipeline 24 is closed, a water supply pump 45 is started to spray water to micro-perforated plates 31 in the dust removal chamber 3 and on the dust removal chamber 3, then each furnace gas diffusion valve 25 is opened, large-flow coal gas enters the dust removal chamber 3 through the furnace gas diffusion valve 25, the coal gas is dedusted and denoised in the process of entering the expansion chamber 5 from the dust removal chamber 3, and then denoised again through the expansion chamber 5 and a silencer 51.
(3) Under the condition of unplanned damping, the gas in the blast furnace body 1 needs to be rapidly reduced in pressure, a blast furnace gas recycling system connected with a gas recycling pipeline 24 is closed, a water supply pump 45 is started to spray water to the perforated plates 31 in the dust chamber 3 and on the dust chamber 3, then each furnace gas diffusion valve 25 is opened, large-flow gas enters the dust chamber 3 through the furnace gas diffusion valve 25, the gas is dedusted and denoised in the process of entering the expansion chamber 5 from the dust chamber 3, and then the aim of dedusting and denoising is achieved through the expansion chamber 5 and the silencer 51.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. The utility model provides a blast furnace top coal gas diffuses system, includes the coal gas ascending pipeline, the coal gas ascending pipeline is connected with coal gas recovery pipeline and at least one furnace gas diffuses the pipeline, furnace gas diffuses the pipeline terminal and is provided with the furnace gas valve, its characterized in that: the device also comprises a dust chamber and an expansion chamber, wherein the dust chamber is provided with an exhaust channel, at least one wall plate of the dust chamber is a micro-perforated plate and forms the exhaust channel, and the outer side of each micro-perforated plate is provided with an outer spraying mechanism for spraying water to an opening area of the micro-perforated plate;
an inner spraying mechanism for spraying water into the chamber cavity of the dust removal chamber is arranged in the dust removal chamber, and the inner spraying mechanism adopts an atomizing nozzle for dust removal and is used for washing and removing dust of the coal gas discharged into the dust removal chamber; each furnace gas blow-off valve is accommodated in the dust removing chamber;
be equipped with the diffusion passageway on the expansion chamber, the clean room arrange in the expansion chamber, be equipped with at least one silencer on the expansion chamber, the air current passageway of silencer constitutes the diffusion passageway, the wallboard of expansion chamber is hollow core slab and presss from both sides in the hollow intracavity of wallboard and establishes the anechoic plate.
2. The blast furnace top gas bleeding system as defined in claim 1, wherein: and a water collecting tray is arranged below the dust removal chamber.
3. The blast furnace top gas bleeding system as defined in claim 2, wherein: the water collecting tray is connected with a water collecting tank through a water return pipe, a filtering mechanism is arranged in the water collecting tank, a water supply pipe connected with a corresponding spraying mechanism is arranged on the pure water side in the tank, and a water supply pump is arranged on the water supply pipe.
4. The blast furnace top gas bleeding system as defined in claim 3, wherein: the water collecting tank is internally provided with a partition board which divides the space in the tank into a water return compartment and a water supply compartment, the water return pipe is communicated with the water return compartment, the water supply pipe is communicated with the water supply compartment, the partition board is provided with an overflow channel, and the overflow channel is provided with a filter screen.
5. The blast furnace top gas bleeding system as defined in claim 1, wherein: the dust removal device is characterized by further comprising a pressure-equalizing blow-off pipeline connected with the weighing tank, a pressure-equalizing blow-off valve is arranged on the pressure-equalizing blow-off pipeline, and the outlet end of the pressure-equalizing blow-off pipeline extends into the dust removal chamber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811594752.XA CN109439821B (en) | 2018-12-25 | 2018-12-25 | Blast furnace top gas bleeding system |
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| CN201811594752.XA CN109439821B (en) | 2018-12-25 | 2018-12-25 | Blast furnace top gas bleeding system |
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| CN109439821A CN109439821A (en) | 2019-03-08 |
| CN109439821B true CN109439821B (en) | 2021-01-05 |
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| CN211420209U (en) * | 2019-12-31 | 2020-09-04 | 中冶南方工程技术有限公司 | Dust removal device for coal gas released from top of blast furnace |
| CN113278747A (en) * | 2020-02-20 | 2021-08-20 | 宝山钢铁股份有限公司 | Method for preventing ash emission from top of blast furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1014327B (en) * | 1988-11-23 | 1991-10-16 | 冶金工业部北京钢铁设计研究总院 | Control method for lowering temp. of blast-furnace gas |
| CN1793388A (en) * | 2005-11-18 | 2006-06-28 | 重庆钢铁(集团)有限责任公司 | Tech. of blast furnace gas drying bag dust removing |
| CN201770718U (en) * | 2010-08-10 | 2011-03-23 | 鞍山锻压机械厂 | Dust-removing wet process deashing device of blast furnace |
| CN101988135B (en) * | 2010-11-24 | 2012-12-05 | 武汉钢铁(集团)公司 | Control process of blast-furnace gas dedusting system |
| CN202390458U (en) * | 2011-11-21 | 2012-08-22 | 济南钢铁股份有限公司 | Coal gas recycling device for blast furnace by dry method dust collecting |
| CN103866067A (en) * | 2014-03-04 | 2014-06-18 | 中冶南方工程技术有限公司 | Blast furnace coal gas gravitational dust collector with cooling effect |
| CN203794924U (en) * | 2014-04-30 | 2014-08-27 | 闫立萍 | Auxiliary equipment for blast-furnace gas dust extraction |
| CN207243917U (en) * | 2017-09-11 | 2018-04-17 | 中冶赛迪工程技术股份有限公司 | A kind of blast furnace gas diffusing dust-extraction unit |
| CN209481704U (en) * | 2018-12-25 | 2019-10-11 | 中冶南方工程技术有限公司 | Coal gas diffusion at top of blast furnace system |
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