CN110617715A - Hot blast stove high-temperature waste gas recycling method - Google Patents
Hot blast stove high-temperature waste gas recycling method Download PDFInfo
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- CN110617715A CN110617715A CN201910970623.4A CN201910970623A CN110617715A CN 110617715 A CN110617715 A CN 110617715A CN 201910970623 A CN201910970623 A CN 201910970623A CN 110617715 A CN110617715 A CN 110617715A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/12—Arrangements for connecting heaters to circulation pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2064—Arrangement or mounting of control or safety devices for air heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Environmental & Geological Engineering (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a method for recycling high-temperature waste gas of a hot blast stove, which comprises the following steps: during the overhaul period of the first hot blast stove, the first hot blast stove is shut down, no high-temperature waste gas is discharged from the first high-temperature waste gas pipeline, the first public regulating valve is opened at the moment, the first high-temperature draught fan is started, the first flue gas furnace inlet regulating valve is opened, part of the high-temperature waste gas generated by the second hot blast stove enters the air mixing chamber of the first flue gas furnace under the air draft effect of the first high-temperature draught fan through the first public pipeline. According to the invention, the first public pipeline, the first public regulating valve, the second public pipeline and the second public regulating valve are arranged, so that the high-temperature waste gas of the hot blast stove and the high-temperature dry gas of the flue gas stove are further recycled, the utilization rate of the waste gas of the hot blast stove is improved, the temperature controllability of a hearth of the flue gas stove is improved, the use amount of blast furnace gas is saved, the air diffusion of the high-temperature waste gas and the dry gas is reduced, and the harm of toxic and harmful substances in the diffused waste gas to the surrounding environment and the personal safety is.
Description
Technical Field
The invention relates to the technical field of iron making, in particular to a method for recycling high-temperature waste gas of a hot blast stove.
Background
The process of using high temperature waste gas to mix wind when the flue gas furnace burns the stove firstly recycles hot-blast furnace waste gas, secondly the technology needs, it is favourable to flue gas furnace operating stability to have high temperature waste gas to mix the wind operation, simultaneously to flue gas furnace horn mouth, life such as furnace has certain extension effect, current technology can only realize that the high temperature waste gas of a hot-blast furnace can only supply a flue gas furnace to use, the high temperature waste gas of another hot-blast furnace can only supply another flue gas furnace to use, this kind of one-to-one mode of utilization exists a little not enoughly, it is mainly: for example, when the first hot blast stove 1 is repaired in large and medium scale, the hot blast stove is shut down, no high-temperature waste gas exists, the dry gas generated by the corresponding first flue gas stove 3 is generated by gas combustion, the gas consumption is increased, the energy consumption is increased, the high-temperature waste gas of the second hot blast stove 2 is in a state of being more than required, the waste gas which is not completely consumed by the corresponding second flue gas stove 4 is discharged to the air by a chimney of the hot blast stove, certain energy waste is caused, the regional environment temperature is increased, in addition, 2 existing EM 53-middle speed ball mills in our factory are adopted, each mill is stopped for regular inspection and regular repair once every week, 8 hours are carried out every time, 864 hours are stopped every year, the average mill is stopped for 2.5 hours every day because a single mill is full of powder, 2700 hours are stopped every year, 2 mills are rotated and stopped for 96 hours every year for annual regular inspection and regular repair, under the above conditions, in order to meet the production requirements, 1 grinding machine must be ensured to normally work, and because the single grinding machine has short single shutdown time, and a plurality of adverse factors are generated on production and safety if the smoke furnace is stopped every shutdown, firstly, the smoke furnace has potential safety hazards of gas poisoning, explosion and the like during frequent shutdown operation and ignition operation, secondly, the time consumption is long when the ignition is successful and the furnace temperature, the bell mouth temperature and the mill inlet temperature are sequentially met from the ignition success to the furnace temperature, the bell mouth temperature and the mill inlet temperature after the furnace is stopped, and the regulation and the control are not suitable, therefore, in order to ensure production and safety, the operation mode of the flue gas furnace when the mill is stopped for a short time is that the flue gas furnace is stopped without stopping, for example, the first mill 5 is stopped, the first flue gas furnace 3 is not stopped, and only the air diffusing butterfly valve 22 is opened to diffuse, so that the generated high-temperature dry air is naturally discharged to the air, and the problem of the operation mode is that: firstly, the dry gas generated by the single-seat flue gas furnace can only be used for the production of a corresponding grinding machine, and the dry gas can only be diffused when the grinding machine is not used, so that the waste of blast furnace gas is caused; secondly, the high-temperature dry gas discharged to the air has influence on the environment, and meanwhile, the dry gas contains CO which is not completely combusted, so that the life safety of personnel in a certain range of a dispersing port is threatened, and therefore, the prior art needs to be improved to solve the problems.
Disclosure of Invention
The invention aims to provide a method for recycling high-temperature waste gas of a hot blast stove, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a method for recycling high-temperature exhaust gas of a hot blast stove comprises the following steps:
s1: when the first hot-blast stove is in overhaul, the first hot-blast stove is shut down, no high-temperature waste gas is discharged from the first high-temperature waste gas pipeline, the first public regulating valve is opened at the moment, the first high-temperature draught fan is started, the first flue gas stove inlet regulating valve is opened, one part of high-temperature waste gas generated by the second hot-blast stove passes through the first public pipeline, the high-temperature waste gas enters the air mixing chamber of the first flue gas stove under the air draft effect of the first high-temperature draught fan, the high-temperature dry gas generated by the first flue gas stove participates in the production of the high-temperature dry gas of the first flue gas stove, the other part of the high-temperature waste gas generated by the second hot-blast stove passes through the second high-temperature waste gas pipeline, the high-temperature dry gas generated by the second hot-blast stove enters the air mixing chamber of the second flue gas stove under the air draft effect of the second high-temperature draught fan, the high-temperature dry gas generated by the first flue gas stove enters the first mill through the first high-temperature dry gas pipeline for The use is carried out;
s2: when the second hot blast stove is in overhaul period, the second hot blast stove is shut down, no high-temperature waste gas is discharged from the second high-temperature waste gas pipeline, the first public regulating valve is opened at the moment, the second high-temperature draught fan is started, the second flue gas stove inlet regulating valve is opened, one part of high-temperature waste gas generated by the first hot blast stove passes through the first public pipeline, the high-temperature waste gas enters the air mixing chamber of the second flue gas stove under the air draft effect of the second high-temperature draught fan, the high-temperature dry gas generated by the second flue gas stove participates in the production of the high-temperature dry gas of the second flue gas stove, the other part of the high-temperature waste gas generated by the first hot blast stove passes through the first high-temperature waste gas pipeline, the high-temperature dry gas enters the air mixing chamber of the first flue gas stove under the air draft effect of the first high-temperature draught fan, the high-temperature dry gas generated by the first flue gas stove enters the first mill through the first high-temperature dry gas pipeline for use of the mill, the high-temperature dry gas The use is carried out;
s3: when the first mill is stopped for regular maintenance and regular repair, the first hot blast stove is not stopped, the coal gas consumption for burning the furnace is properly reduced, the regulating valve at the inlet of the first mill is closed, the second public regulating valve is opened, the high-temperature dry air generated by the first smoke furnace and the second smoke furnace is converged at the newly-added second public pipeline at the outlet of the smoke furnace and then is used for milling powder by the second mill, and at the moment, the air diffusing butterfly valve on the air diffusing pipe at the outlet of the first smoke furnace is not opened for diffusing, so that zero emission is realized;
s4: when the second mill is stopped for regular maintenance and regular repair, the second hot blast stove is not stopped, the coal gas consumption for burning the furnace is properly reduced, the inlet adjusting valve of the second mill is closed, the second public adjusting valve is opened, the high-temperature dry air generated by the second flue gas furnace and the first flue gas furnace is supplied for the powder making of the first mill after confluence at the second public pipeline newly added at the outlet of the flue gas furnace, and at the moment, the air diffusing butterfly valve on the air diffusing pipe at the outlet of the second flue gas furnace is not opened for diffusing, so that zero emission is realized.
Preferably, the first common regulating valve is arranged on a first common pipeline, and the first common pipeline is arranged between a first high-temperature waste gas pipeline in front of the first flue gas furnace inlet regulating valve and a second high-temperature waste gas pipeline in front of the second flue gas furnace inlet regulating valve.
Preferably, the second common regulating valve is arranged on a second common pipeline, and the second common pipeline is arranged between a first high-temperature drying air pipeline before the first mill inlet regulating valve and a second high-temperature drying air pipeline before the second mill inlet regulating valve.
Preferably, the pair of air diffusing pipes are arranged in two, and the two air diffusing pipes are respectively arranged on a first high-temperature dry air pipeline at the outlet of the first flue gas furnace and a second high-temperature dry air pipeline at the outlet of the second flue gas furnace.
Preferably, the air diffusing butterfly valve is a water-cooling butterfly valve.
Preferably, the first common regulating valve and the second common regulating valve are both set to be electrically operated valves, and the first common regulating valve and the second common regulating valve are both led into a central control room and are controlled by a hand operator in a centralized mode.
Compared with the prior art, the invention has the beneficial effects that.
(1) According to the invention, through arranging the first common pipeline and the first common regulating valve, by utilizing an improved facility and a new operation method, when a certain hot blast stove needs major and minor maintenance, the first common regulating valve is opened, the high-temperature induced draft fan in front of the hot blast stove is started, the flue gas stove inlet regulating valve in front of the high-temperature induced draft fan is opened, and high-temperature waste gas generated by the other hot blast stove enters the air mixing chamber of the corresponding flue gas stove of the hot blast stove through the first common pipeline to participate in the production of high-temperature dry gas of the flue gas stove The coal gas consumption is much less than that of a single-burning coal gas burning furnace, and the coal gas burning furnace has obvious effects of saving energy and reducing consumption.
(2) The invention can realize zero emission of flue gas by arranging the second common pipeline and the second common regulating valve, when a certain mill needs to be shut down, the regulating valve at the inlet of the mill in front of the mill is closed, the second common regulating valve is opened, at the moment, high-temperature dry air generated by the first flue gas furnace and the second flue gas furnace is supplied for milling powder of the normally working mill after the confluence of the second common pipeline newly added at the outlet of the flue gas furnace, and at the moment, an air emission butterfly valve on an air emission pipe at the outlet of the flue gas furnace is not required to be opened for emission, thereby realizing zero emission.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
The reference numbers in the figures are: 1. a first hot blast stove; 2. a second hot blast stove; 3. a first flue gas furnace; 4. a second flue gas furnace; 5. a first mill; 6. a second mill; 7. a first high temperature exhaust gas conduit; 8. an inlet regulating valve of the first flue gas furnace; 9. a first high temperature induced draft fan; 10. a first high temperature drying gas duct; 11. a first mill inlet regulating valve; 12. a second high temperature exhaust gas conduit; 13. an inlet regulating valve of the second flue gas furnace; 14. a second high-temperature induced draft fan; 15. a second high temperature drying gas duct; 16. a second mill inlet regulating valve; 17. a first common conduit; 18. a first common regulating valve; 19. a second common conduit; 20. a second common regulating valve; 21. an air diffusing pipe; 22. an air diffusing butterfly valve.
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. 1, an embodiment of the present invention: a method for recycling high-temperature waste gas of a hot blast stove comprises the following steps:
s1: when the first hot blast stove 1 is in overhaul, the first hot blast stove 1 is shut down, no high-temperature waste gas is discharged from the first high-temperature waste gas pipeline 7, at the moment, the first public regulating valve 18 is opened, the first high-temperature draught fan 9 is started, the first flue gas stove inlet regulating valve 8 is opened, one part of the high-temperature waste gas generated by the second hot blast stove 2 passes through the first public pipeline 17, enters the air mixing chamber of the first flue gas stove 3 under the air draft action of the first high-temperature draught fan 9, participates in the production of high-temperature dry gas of the first flue gas stove 3, the other part of the high-temperature waste gas generated by the second hot blast stove 2 passes through the second high-temperature waste gas pipeline 12, enters the air mixing chamber of the second flue gas stove 4 under the air draft action of the second high-temperature draught fan 14, participates in the production of high-temperature dry gas of the second flue gas stove 4, the high-temperature dry gas produced by the first flue gas stove 3 enters the first high-temperature gas pipeline 10 for, high-temperature dry gas after second flue gas furnace 4 has produced supplies the mill powder process to use in getting into second mill 6 through second high-temperature dry gas pipeline 15, it repairs when the time of 1 major-minor of first hot-blast furnace to have solved traditional overall arrangement, first flue gas furnace 3 does not have the problem that high temperature waste gas mixes the wind, the use amount of blast furnace gas has been reduced under the equal temperature requirement, the energy has been practiced thrift, in addition, the utilization ratio of 2 high temperature waste gases of second hot-blast furnace has also been improved, first flue gas furnace 3 and second flue gas furnace 4 share 2 high temperature waste gases of second hot-blast furnace, make the supply and demand relation more balanced, furthest reduces the air discharge of surplus high temperature waste gas.
S2: when the second hot blast stove 2 is in overhaul, the second hot blast stove 2 is shut down, no high-temperature waste gas is discharged from a second high-temperature waste gas pipeline 12, at the moment, a first public regulating valve 18 is opened, a second high-temperature draught fan 14 is started, a second flue gas stove inlet regulating valve 13 is opened, one part of the high-temperature waste gas generated by the first hot blast stove 1 enters a wind mixing chamber of the second flue gas stove 4 under the air draft effect of the second high-temperature draught fan 14 and participates in the production of high-temperature dry gas of the second flue gas stove 4, the other part of the high-temperature waste gas generated by the first hot blast stove 1 enters a wind mixing chamber of the first flue gas stove 3 through a first high-temperature waste gas pipeline 7 under the air draft effect of a first high-temperature draught fan 9 and participates in the production of the high-temperature dry gas of the first flue gas stove 3, the high-temperature dry gas produced by the first flue gas stove 3 enters a first high-temperature gas pipeline 10 and is used for milling, high-temperature dry gas produced by the second flue gas furnace 4 enters the second mill 6 through a second high-temperature dry gas pipeline 15 for milling by the mill, so that the problem that the second flue gas furnace 4 does not have high-temperature waste gas mixed air when the second hot blast stove 2 is repaired in the middle and large scale in the traditional layout is solved, the consumption of blast furnace gas is reduced under the same temperature requirement, the energy is saved, in addition, the utilization rate of the high-temperature waste gas of the first hot blast stove 1 is also improved, the first flue gas furnace 3 and the second flue gas furnace 4 share the high-temperature waste gas of the first hot blast stove 1, the supply and demand relationship is more balanced, and the air emission of the excessive high-temperature waste gas is reduced to the maximum extent;
s3: when the first mill 5 is stopped for regular maintenance and regular repair, the first hot blast stove 1 is not stopped, the coal gas consumption for burning the furnace is properly reduced, the inlet adjusting valve 11 of the first mill is closed, the second public adjusting valve 20 is opened, the high-temperature dry gas generated by the first flue gas furnace 3 and the second flue gas furnace 4 is supplied for the second mill 6 to prepare powder after being converged in the second public pipeline 19 newly added at the outlet of the flue gas furnace, and the air diffusing butterfly valve 22 on the air diffusing pipe 21 at the outlet of the first flue gas furnace 3 is not required to be opened and diffused, so that zero emission is realized;
s4: when the second mill 6 is stopped for regular maintenance and regular repair, the second hot blast stove 2 is not stopped, the coal gas consumption for burning the furnace is properly reduced, the inlet adjusting valve 16 of the second mill is closed, the second public adjusting valve 20 is opened, the high-temperature dry gas generated by the second flue gas furnace 4 and the first flue gas furnace 3 is supplied for the powder making of the first mill 5 after converging in the second public pipeline 19 newly added at the outlet of the flue gas furnace, and at the moment, the air diffusing butterfly valve 22 on the air diffusing pipe 21 at the outlet of the second flue gas furnace 4 is not required to be opened and diffused, so that zero emission is realized.
Further, a first common regulating valve 18 is arranged on the first common pipeline 17, the first common pipeline 17 is arranged between the first high-temperature waste gas pipeline 7 in front of the first flue gas furnace inlet regulating valve 8 and the second high-temperature waste gas pipeline 12 in front of the second flue gas furnace inlet regulating valve 13, and the first common pipeline 17 performs merging and shunting operation on the high-temperature waste gas of the first hot blast stove 1 and the high-temperature waste gas of the second hot blast stove 2.
Further, a second common adjusting valve 20 is arranged on a second common pipeline 19, the second common pipeline 19 is arranged between the first high-temperature drying air pipeline 10 in front of the first mill inlet adjusting valve 11 and the second high-temperature drying air pipeline 15 in front of the second mill inlet adjusting valve 16, and the second common pipeline 19 performs merging and splitting operations on the high-temperature drying air of the first flue gas furnace 3 and the high-temperature drying air of the second flue gas furnace 4.
Further, be provided with two to empty diffusing pipe 21, two to empty diffusing pipe 21 sets up respectively on the first high temperature dry air pipe way 10 in first flue gas stove 3 exit and on the second high temperature dry air pipe way 15 in second flue gas stove 4 exit, when mill or public valve break down, or when the high temperature dry air is excessive, can open and suitably diffuse, improve equipment's operation factor of safety.
Further, the air bleeding butterfly valve 22 is set as a water-cooled butterfly valve.
Further, the first public regulating valve 18 and the second public regulating valve 20 are both set to be electric valves, the first public regulating valve 18 and the second public regulating valve 20 are both led into a central control room and are controlled by hand operators in a centralized mode, whether the first high-temperature waste gas pipeline 7 is communicated with the second high-temperature waste gas pipeline 12 or not is achieved through opening and closing of the first public regulating valve 18, and whether the first high-temperature drying gas pipeline 10 is communicated with the second high-temperature drying gas pipeline 15 or not is achieved through opening and closing of the second public regulating valve 20.
The working principle is as follows: when a certain hot blast stove needs major and minor maintenance, the invention opens the first public regulating valve 18, starts the high-temperature induced draft fan in front of the hot blast stove, opens the flue gas stove inlet regulating valve in front of the high-temperature induced draft fan, and allows the high-temperature waste gas generated by another hot blast stove to enter the air mixing chamber of the corresponding flue gas stove of the hot blast stove through the first public pipeline 17 to participate in the production of the high-temperature dry gas of the flue gas stove When a certain mill needs to be shut down, the inlet adjusting valve of the mill in front of the mill is closed, the second public adjusting valve 20 is opened, the high-temperature dry air generated by the first flue gas furnace 3 and the second flue gas furnace 4 is converged in the second public pipeline 19 newly added at the outlet of the flue gas furnaces and then is used for milling powder by the normally working mill, and the air diffusing butterfly valve 22 on the air diffusing pipe 21 at the outlet of the flue gas furnaces is not required to be opened and diffused, so that zero emission is realized.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A method for recycling high-temperature waste gas of a hot blast stove is characterized by comprising the following steps: the method comprises the following steps:
s1: when the first hot blast stove (1) is repaired in the middle or large scale, the first hot blast stove (1) is shut down, no high-temperature waste gas is discharged from the first high-temperature waste gas pipeline (7), at the moment, the first public regulating valve (18) is opened, the first high-temperature draught fan (9) is started, the first flue gas stove inlet regulating valve (8) is opened, one part of high-temperature waste gas generated by the second hot blast stove (2) passes through the first public pipeline (17), enters the air mixing chamber of the first flue gas stove (3) under the air draft effect of the first high-temperature draught fan (9), participates in the production of high-temperature dry gas of the first flue gas stove (3), the other part of high-temperature waste gas generated by the second hot blast stove (2) passes through the second high-temperature waste gas pipeline (12), enters the air mixing chamber of the second flue gas stove (4) under the air draft effect of the second high-temperature draught fan (14), participates in the production of high-temperature dry gas, high-temperature drying gas produced by the first flue gas furnace (3) enters the first mill (5) through a first high-temperature drying gas pipeline (10) for milling by the mill, and high-temperature drying gas produced by the second flue gas furnace (4) enters the second mill (6) through a second high-temperature drying gas pipeline (15) for milling by the mill;
s2: when the second hot blast stove (2) is under overhaul, the second hot blast stove (2) is shut down, no high-temperature waste gas is discharged from a second high-temperature waste gas pipeline (12), at the moment, a first public regulating valve (18) is opened, a second high-temperature draught fan (14) is started, a second flue gas stove inlet regulating valve (13) is opened, one part of the high-temperature waste gas generated by the first hot blast stove (1) passes through a first public pipeline (17), enters a wind mixing chamber of a second flue gas stove (4) under the air draft effect of the second high-temperature draught fan (14), participates in the production of high-temperature dry gas of the second flue gas stove (4), the other part of the high-temperature waste gas generated by the first hot blast stove (1) passes through a first high-temperature waste gas pipeline (7), enters a wind mixing chamber of the first flue gas stove (3) under the air draft effect of a first high-temperature draught fan (9), participates in the production of the high-temperature dry gas of the, high-temperature drying gas produced by the first flue gas furnace (3) enters the first mill (5) through a first high-temperature drying gas pipeline (10) for milling by the mill, and high-temperature drying gas produced by the second flue gas furnace (4) enters the second mill (6) through a second high-temperature drying gas pipeline (15) for milling by the mill;
s3: when the first mill (5) is stopped for fixed inspection and fixed maintenance, the first hot blast stove (1) is not stopped, the coal gas consumption for burning is properly reduced, the inlet adjusting valve (11) of the first mill is closed, the second public adjusting valve (20) is opened, high-temperature dry gas generated by the first smoke stove (3) and the second smoke stove (4) is converged in a second public pipeline (19) newly added at the outlet of the smoke stove and then is used for powder making of the second mill (6), and at the moment, an air diffusing butterfly valve (22) on an air diffusing pipe (21) at the outlet of the first smoke stove (3) is not required to be opened for diffusing, so that zero emission is realized;
s4: when the second mill (6) is stopped for regular maintenance and regular repair, the second hot blast stove (2) is not stopped, the coal gas consumption for burning the stove is properly reduced, the inlet adjusting valve (16) of the second mill is closed, the second public adjusting valve (20) is opened, the high-temperature dry gas generated by the second flue gas stove (4) and the first flue gas stove (3) is supplied for powder making of the first mill (5) after confluence of the newly-increased second public pipeline (19) at the outlet of the flue gas stove, and at the moment, the air diffusing butterfly valve (22) at the outlet of the second flue gas stove (4) on the air diffusing pipe (21) is not required to be opened for diffusion, so that zero emission is realized.
2. The method for recycling the high-temperature exhaust gas of the hot blast stove according to claim 1, characterized in that: the first common regulating valve (18) is arranged on a first common pipeline (17), and the first common pipeline (17) is arranged between a first high-temperature waste gas pipeline (7) in front of the first flue gas furnace inlet regulating valve (8) and a second high-temperature waste gas pipeline (12) in front of the second flue gas furnace inlet regulating valve (13).
3. The method for recycling the high-temperature exhaust gas of the hot blast stove according to claim 1, characterized in that: the second common control valve (20) is arranged on a second common pipe (19), and the second common pipe (19) is arranged between a first high-temperature drying air pipe (10) before the first mill inlet control valve (11) and a second high-temperature drying air pipe (15) before the second mill inlet control valve (16).
4. The method for recycling the high-temperature exhaust gas of the hot blast stove according to claim 1, characterized in that: the air diffusing pipes (21) are arranged in two, the air diffusing pipes (21) are respectively arranged on a first high-temperature dry air pipeline (10) at the outlet of the first smoke furnace (3) and a second high-temperature dry air pipeline (15) at the outlet of the second smoke furnace (4).
5. The method for recycling the high-temperature exhaust gas of the hot blast stove according to claim 1, characterized in that: the air diffusing butterfly valve (22) is set to be a water-cooling butterfly valve.
6. The method for recycling the high-temperature exhaust gas of the hot blast stove according to claim 1, characterized in that: the first common regulating valve (18) and the second common regulating valve (20) are both set to be electric valves, and the first common regulating valve (18) and the second common regulating valve (20) are both led into a central control room to be controlled by a hand operator in a centralized mode.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2591047Y (en) * | 2002-12-31 | 2003-12-10 | 中冶集团北京钢铁设计研究总院 | Hot-blast furnace waste gas comprehensive utilizing device |
| CN202989197U (en) * | 2012-12-17 | 2013-06-12 | 武汉钢铁(集团)公司 | Improved exhaust gas emission pipeline of blast-furnace hot blast stove |
| CN203007295U (en) * | 2013-01-11 | 2013-06-19 | 莱芜钢铁集团有限公司 | Novel blast-furnace hot blast stove exhaust gas classification recycle device |
| CN203360397U (en) * | 2013-06-04 | 2013-12-25 | 贵州天福化工有限责任公司 | Coal mill drying systems adopting parallel structure |
| CN203602637U (en) * | 2013-12-09 | 2014-05-21 | 中天钢铁集团有限公司 | Device for injecting mixed bituminous coal by virtue of exhaust gas self-circulation |
| CN205603616U (en) * | 2016-01-15 | 2016-09-28 | 山东钢铁股份有限公司 | Granular coal pulverizing system |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2591047Y (en) * | 2002-12-31 | 2003-12-10 | 中冶集团北京钢铁设计研究总院 | Hot-blast furnace waste gas comprehensive utilizing device |
| CN202989197U (en) * | 2012-12-17 | 2013-06-12 | 武汉钢铁(集团)公司 | Improved exhaust gas emission pipeline of blast-furnace hot blast stove |
| CN203007295U (en) * | 2013-01-11 | 2013-06-19 | 莱芜钢铁集团有限公司 | Novel blast-furnace hot blast stove exhaust gas classification recycle device |
| CN203360397U (en) * | 2013-06-04 | 2013-12-25 | 贵州天福化工有限责任公司 | Coal mill drying systems adopting parallel structure |
| CN203602637U (en) * | 2013-12-09 | 2014-05-21 | 中天钢铁集团有限公司 | Device for injecting mixed bituminous coal by virtue of exhaust gas self-circulation |
| CN205603616U (en) * | 2016-01-15 | 2016-09-28 | 山东钢铁股份有限公司 | Granular coal pulverizing system |
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Application publication date: 20191227 |