CN210596124U - Blast furnace top gas recovery device utilizing recovered gas for secondary pressure equalization - Google Patents
Blast furnace top gas recovery device utilizing recovered gas for secondary pressure equalization Download PDFInfo
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- CN210596124U CN210596124U CN201921796796.0U CN201921796796U CN210596124U CN 210596124 U CN210596124 U CN 210596124U CN 201921796796 U CN201921796796 U CN 201921796796U CN 210596124 U CN210596124 U CN 210596124U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
A blast furnace top gas recovery device for secondary pressure equalization by utilizing recovered gas. The method is characterized in that: the coal gas high-pressure gas storage tank is communicated with the cyclone dust collector through a first pipeline, and is sequentially provided with a booster pump and a bag-type dust collector; a second pipeline is arranged between the coal gas high-pressure gas storage tank and the weighing material tank, and a secondary pressure equalizing valve is arranged. The coal gas recovery device has the advantages that 1, the coal gas is actively conveyed into the coal gas high-pressure gas storage tank by the aid of the pressurizing pump, active coal gas recovery is achieved, and compared with the existing method that natural pressure is adopted for storage, the coal gas recovery device is high in recovery efficiency and good in energy-saving effect; 2. the recycled coal gas is used for replacing nitrogen for secondary pressure equalization, so that the nitrogen consumption can be saved, the cost is reduced, low-temperature nitrogen is reduced to enter the coal gas, and the air temperature of the hot blast stove and the power generation efficiency of a turbine are correspondingly improved.
Description
Technical Field
The utility model relates to the technical field of metallurgical ironmaking furnace top charging equipment, in particular to a blast furnace top gas recovery device utilizing secondary pressure equalizing of recovered gas.
Background
At present, in the field of metallurgical iron making, the technology of recovering the blast furnace top pressure-equalizing blow-off gas is gradually popularized and used, and considerable economic benefits are created for users. However, the existing gas recovery technology adopts the method of adding one or more containers communicated with a weighing material tank, such as a buffer tank and a bag-type dust collector, the gas of the weighing material tank is stored in the buffer tank and the bag-type dust collector in a balanced manner by means of natural pressure, after a valve is closed, the weighing material tank still has residual gas which is discharged into the atmosphere, the larger the volumes of the buffer tank and the bag-type dust collector are, the higher the gas recovery rate is, the larger the corresponding equipment investment is, the recovery rate of the existing gas blast furnace top pressure-equalizing and bleeding gas recovery technology is only about 70%, the recovery rate is not high, and about 30% of the gas is discharged into the atmosphere.
In the process of blast furnace smelting feeding production, two types of coal gas and nitrogen gas are commonly used as pressure equalizing media of a charging bucket on the top of a blast furnace, clean coal gas and semi-clean coal gas are adopted as the pressure equalizing media in most domestic steel mills, nitrogen gas is adopted as a secondary pressure equalizing medium, and after the nitrogen gas for pressure equalizing is mixed into the blast furnace gas, the heat value of the blast furnace gas is reduced, and certain influence is indirectly caused on production.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the background art, the utility model provides a blast furnace top gas recovery device for secondary pressure equalizing by using recovered gas, which realizes active recovery of gas and replaces nitrogen gas with the recovered gas for secondary pressure equalizing.
The utility model discloses the technical scheme who adopts: a blast furnace top gas recovery device utilizing secondary pressure equalization of recovered gas comprises a weighing material tank, a gas pressure equalization pipeline communicated with the weighing material tank, and a cyclone dust collector communicated with the weighing material tank, wherein a pressure equalization valve is arranged on the gas pressure equalization pipeline, and a stop valve is arranged between the cyclone dust collector and the weighing material tank; the device also comprises a coal gas high-pressure gas storage tank; the coal gas high-pressure gas storage tank is communicated with the cyclone dust collector through a first pipeline, and is sequentially provided with a booster pump and a bag-type dust collector; and a second pipeline is arranged between the coal gas high-pressure gas storage tank and the weighing material tank, and a secondary pressure equalizing valve is arranged.
The gas high-pressure gas storage tank is characterized by further comprising a nitrogen tank, a third pipeline is arranged between the gas high-pressure gas storage tank and the nitrogen tank, and a nitrogen security pressure supplementing system is mounted on the third pipeline.
The nitrogen tank is communicated with the weighing material tank, and a nitrogen stop valve is arranged between the nitrogen tank and the weighing material tank.
And a check valve is arranged on a first pipeline between the coal gas high-pressure gas storage tank and the pressurizing pump.
The weighing material tank is arranged on the top of the blast furnace, the upper end of the weighing material tank is provided with a receiving hopper, an upper sealing valve is arranged between the weighing material tank and the receiving hopper, and a lower sealing valve is arranged between the lower end of the weighing material tank and the blast furnace; and a fourth pipeline is arranged between the coal gas high-pressure gas storage tank and the lower sealing valve, and a regulating valve is arranged on the fourth pipeline.
The material weighing bucket is characterized by further comprising a silencer, and pressure-equalizing blow-off valves are arranged between the silencer and the weighing bucket as well as between the silencer and the cyclone dust collector.
The coal gas high-pressure gas storage tank is connected with a drainage device.
The utility model has the advantages that: by adopting the scheme, 1, the coal gas is actively conveyed into the coal gas high-pressure gas storage tank by adopting the pressurizing pump, so that the coal gas is actively recycled, and compared with the existing method of storing by adopting natural pressure, the method has the advantages of higher recycling efficiency and better energy-saving effect; 2. the recycled coal gas is used for replacing nitrogen for secondary pressure equalization, so that the nitrogen consumption can be saved, the cost is reduced, low-temperature nitrogen is reduced to enter the coal gas, and the air temperature of the hot blast stove and the power generation efficiency of a turbine are correspondingly improved.
Drawings
Fig. 1 is a schematic connection diagram of an embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be further explained with reference to the accompanying drawings:
as shown in the figure, the blast furnace top gas recovery device for secondary pressure equalization by using recovered gas comprises a weighing charging bucket 1, a cyclone dust collector 3 and a gas high-pressure gas storage tank 6.
Weigh the material jar 1 and install at blast furnace roof position, its upper end is equipped with the hopper 17, and weigh and be equipped with between material jar 1 and the hopper 17 and close valve 18, weigh and be equipped with down between material jar 1 lower extreme and the blast furnace and close valve 19.
The weighing material tank 1 is further connected with a coal gas pressure equalizing pipeline 2, a pressure equalizing valve 4 and a pressure equalizing blind plate valve 25 are arranged on the coal gas pressure equalizing pipeline 2, the weighing material tank 1 is communicated with a clean coal gas network pipe through the coal gas pressure equalizing pipeline 2, and the pressure equalizing valve 4 is used for providing coal gas pressure equalization for the weighing material tank 1.
The cyclone dust collector 3 is connected with the weighing material tank 1 through a pipeline, and a cut-off valve 5 is arranged between the cyclone dust collector 3 and the weighing material tank 1.
The coal gas high-pressure gas storage tank 6 is communicated with the cyclone dust collector 3 through a first pipeline 7, a check valve 16, a pressure pump 8 and a bag-type dust collector 9 are sequentially installed on the first pipeline 7, a second pipeline 10 is arranged between the coal gas high-pressure gas storage tank 6 and the weighing material tank 1, and a secondary pressure equalizing valve 11 is installed.
The gas high-pressure gas storage tank 6 is a pressure container, the tank body is cylindrical, a safety valve is arranged on the tank body, the gas high-pressure gas storage tank 6 is guaranteed to be opened under the condition that the pressure exceeds the set pressure, the gas high-pressure gas storage tank 6 is guaranteed to be safe and reliable, and a drainage device 24 is connected to the bottom of the gas high-pressure gas storage tank 6 and used for discharging gas condensate water.
The bag-type dust collector 9 is a general product, the shell is made of a steel plate and is of a circular or square structure, a high-temperature-resistant filter bag is arranged in the bag-type dust collector, and the bag-type backflushing is carried out by backflushing gas in a gas high-pressure gas storage tank.
The booster pump 8 is a frequency conversion booster pump which is a general product, can adjust the rotating speed, is used for generating pressure and actively conveys the coal gas to the coal gas high-pressure gas storage tank.
The check valve 16 is a general product and is used for preventing the gas in the gas high-pressure gas storage tank from flowing backwards into the pressurizing pump 8.
The blast furnace top gas recovery device can realize ordered actions by setting programs through an automatic control system, meets the requirements of production technology, and has the following specific working process:
before the cut-off valve 5 is opened, the pressure pump 8 extracts coal gas from the cyclone dust collector 3 and the bag-type dust collector 9 and conveys the coal gas into the coal gas high-pressure gas storage tank 6, the cyclone dust collector 3 and the bag-type dust collector 9 can reach a negative pressure value set by a system within a certain time, then the rotating speed of the pressure pump 8 is stopped or reduced, the lower sealing valve 19 is closed, the cut-off valve 5 is opened, the coal gas in the weighing material tank 1 can enter the cyclone dust collector 3 and the bag-type dust collector 9 in a negative pressure state, the rotating speed of the pressure pump 8 is started or increased simultaneously to convey the coal gas into the coal gas high-pressure gas storage tank 6, after the cut-off valve 5 is opened for 8-10S, the cut-off valve 5 is closed, the upper sealing valve 18 and the receiving hopper 17 are opened to feed materials into the weighing material tank 1, at the moment, the pressure pump 8 continues, the operation is repeated in a circulating way.
Weigh 1 voltage-sharing in the material jar, at first open equalizing valve 4, when weighing the pressure in the material jar 1 and being close to gas pressure, close equalizing valve 4, then open secondary equalizing valve 11, high-pressure gas in the gas high pressure gas holder 6 enters into through second pipeline 10 and weighs material jar 1, the pressure in balanced weighing material jar 1 and the blast furnace stove, then open lower dense valve 19, weigh the material in the material jar then and enter into the blast furnace, after the certain time delay, close secondary equalizing valve 11.
A fourth pipeline 20 is further arranged between the gas high-pressure gas storage tank 6 and the lower sealing valve 19, an adjusting valve 21 is arranged on the fourth pipeline 20 and used for adjusting the pressure in the gas high-pressure gas storage tank 6, when the pressure in the gas high-pressure gas storage tank 6 reaches a set value (the set value is usually smaller than the set value of a safety valve of the gas high-pressure gas storage tank), the booster pump still continues to convey gas into the gas high-pressure gas storage tank 6, the adjusting valve 21 is opened at the moment, the gas is conveyed to the lower sealing valve 1, the pressure in the gas high-pressure gas storage tank 6 is adjusted, namely, the pressure in the gas high-pressure gas storage tank 6 is ensured not to be too high, and the gas is prevented from being; when the pressure in the gas high-pressure gas storage tank 6 is lower than the set pressure, the regulating valve 21 is closed.
Wherein, when weighing the charging bucket 1 pressure-sharing, especially when the secondary pressure-sharing valve 11 opens, close the governing valve 21, after the pressure-sharing is over, the governing valve 21 continues to close or open with the pressure value in the gas high-pressure gas holder 6 again, realizes pressure control.
In addition, still include nitrogen gas jar 12, be equipped with third pipeline 13 between gas high pressure gas holder 6 and the nitrogen gas jar 12, install nitrogen gas security pressure compensating system 14 on the third pipeline 13, just nitrogen gas jar 12 with weigh the material jar 1 and be linked together, and nitrogen gas jar 12 with weigh and be equipped with nitrogen gas trip valve 15 between the material jar 1.
The nitrogen security pressure supplementing system 14 generally comprises a nitrogen relief valve, a nitrogen inlet valve, a nitrogen vent valve and the like, nitrogen is used as a standby medium, when the gas pressure of the gas high-pressure gas storage tank 6 is insufficient and reaches a certain set value, the nitrogen inlet valve is opened to supplement the pressure of the gas high-pressure gas storage tank 6, and when the gas high-pressure gas storage tank 6 stops working, the nitrogen cut-off valve 15 can be opened to provide secondary pressure equalization for the weighing material tank 1, so that normal operation is guaranteed, and the nitrogen security pressure supplementing system 14 can be manually opened and closed to purge gas, so that the safety of personnel and equipment is guaranteed.
The material weighing bucket further comprises a silencer 22, pressure-equalizing bleeding valves 23 are arranged between the silencer 22 and the weighing bucket 1 and between the silencer 22 and the cyclone dust collector 3, and pressure-equalizing bleeding blind plate valves 26 are further arranged between the silencer and the cyclone dust collector 3.
The blast furnace top gas recovery device for secondary pressure equalization by using the recovered gas has the advantages that: 1. the coal gas is actively conveyed into the coal gas high-pressure gas storage tank by adopting the pressure pump, so that the active recovery of the coal gas is realized, and compared with the prior art that natural pressure is adopted for storage, the recovery efficiency is higher, and the energy-saving effect is better; 2. the recycled coal gas is used for replacing nitrogen for secondary pressure equalization, so that the nitrogen consumption can be saved, the cost is reduced, low-temperature nitrogen is reduced to enter the coal gas, and the air temperature of the hot blast stove and the power generation efficiency of a turbine are correspondingly improved.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The skilled person should understand that: although the present invention has been described in accordance with the above embodiments, the inventive concept is not limited to this embodiment, and any modification of the inventive concept will be included in the scope of the patent claims.
Claims (7)
1. A blast furnace top gas recovery device utilizing recovered gas for secondary pressure equalization comprises a weighing charging bucket (1), a gas pressure equalizing pipeline (2) communicated with the weighing charging bucket (1), and a cyclone dust collector (3) communicated with the weighing charging bucket (1), wherein a pressure equalizing valve (4) is arranged on the gas pressure equalizing pipeline (2), and a stop valve (5) is arranged between the cyclone dust collector (3) and the weighing charging bucket (1); the method is characterized in that: also comprises a coal gas high-pressure gas storage tank (6); the coal gas high-pressure gas storage tank (6) is communicated with the cyclone dust collector (3) through a first pipeline (7), and is sequentially provided with a booster pump (8) and a bag-type dust collector (9); a second pipeline (10) is arranged between the coal gas high-pressure gas storage tank (6) and the weighing charging bucket (1), and a secondary pressure equalizing valve (11) is installed.
2. The top gas recovery device of a blast furnace using secondary pressure equalization of recovered gas according to claim 1, characterized in that: the device is characterized by further comprising a nitrogen tank (12), a third pipeline (13) is arranged between the coal gas high-pressure gas storage tank (6) and the nitrogen tank (12), and a nitrogen security pressure supplementing system (14) is installed on the third pipeline (13).
3. The top gas recovery device of a blast furnace using secondary pressure equalization of recovered gas according to claim 2, characterized in that: the nitrogen tank (12) is communicated with the weighing charging bucket (1), and a nitrogen stop valve (15) is arranged between the nitrogen tank (12) and the weighing charging bucket (1).
4. The top gas recovery device of a blast furnace using secondary pressure equalization of recovered gas according to claim 1, characterized in that: a check valve (16) is arranged on a first pipeline (7) between the coal gas high-pressure gas storage tank (6) and the booster pump (8).
5. The top gas recovery device of a blast furnace using secondary pressure equalization of recovered gas according to claim 1, characterized in that: the weighing material tank (1) is arranged at the top of the blast furnace, the upper end of the weighing material tank is provided with a receiving hopper (17), an upper sealing valve (18) is arranged between the weighing material tank (1) and the receiving hopper (17), and a lower sealing valve (19) is arranged between the lower end of the weighing material tank (1) and the blast furnace; a fourth pipeline (20) is arranged between the coal gas high-pressure gas storage tank (6) and the lower sealing valve (19), and an adjusting valve (21) is arranged on the fourth pipeline (20).
6. The top gas recovery device of a blast furnace using secondary pressure equalization of recovered gas according to claim 1, characterized in that: the material weighing bucket is characterized by further comprising a silencer (22), and pressure-equalizing blow-off valves (23) are arranged between the silencer (22) and the weighing bucket (1) and between the silencer and the cyclone dust collector (3).
7. The top gas recovery device of a blast furnace using secondary pressure equalization of recovered gas according to claim 1, characterized in that: the coal gas high-pressure gas storage tank (6) is connected with a drainage device (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921796796.0U CN210596124U (en) | 2019-10-24 | 2019-10-24 | Blast furnace top gas recovery device utilizing recovered gas for secondary pressure equalization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921796796.0U CN210596124U (en) | 2019-10-24 | 2019-10-24 | Blast furnace top gas recovery device utilizing recovered gas for secondary pressure equalization |
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| Publication Number | Publication Date |
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| CN210596124U true CN210596124U (en) | 2020-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921796796.0U Active CN210596124U (en) | 2019-10-24 | 2019-10-24 | Blast furnace top gas recovery device utilizing recovered gas for secondary pressure equalization |
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