CN114959146B - Hot-blast stove pressure charging and discharging system and control method thereof - Google Patents
Hot-blast stove pressure charging and discharging system and control method thereof Download PDFInfo
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- CN114959146B CN114959146B CN202210828463.1A CN202210828463A CN114959146B CN 114959146 B CN114959146 B CN 114959146B CN 202210828463 A CN202210828463 A CN 202210828463A CN 114959146 B CN114959146 B CN 114959146B
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- blast stove
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- 238000007599 discharging Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 22
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000003546 flue gas Substances 0.000 claims abstract description 64
- 239000007789 gas Substances 0.000 claims description 144
- 238000003860 storage Methods 0.000 claims description 108
- 238000002485 combustion reaction Methods 0.000 claims description 63
- 238000004891 communication Methods 0.000 claims description 40
- 239000002912 waste gas Substances 0.000 claims description 38
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 19
- 239000001301 oxygen Substances 0.000 claims description 19
- 229910052760 oxygen Inorganic materials 0.000 claims description 19
- 239000000567 combustion gas Substances 0.000 claims description 18
- 239000000779 smoke Substances 0.000 claims description 13
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 239000013589 supplement Substances 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 4
- 230000008569 process Effects 0.000 description 10
- 230000001105 regulatory effect Effects 0.000 description 9
- 230000008901 benefit Effects 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000005422 blasting Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The application discloses a hot blast stove charging and discharging pressure system and a control method thereof, which relate to the technical field of hot blast stoves, wherein the hot blast stove charging and discharging pressure system comprises: a first hot blast stove; a second hot blast stove; a third hot blast stove; a fourth hot blast stove; a hot blast main pipe which can be respectively connected with the first hot blast stove, the second hot blast stove, the third hot blast stove and the fourth hot blast stove in an on-off mode, wherein an outlet of the hot blast main pipe is communicated with a blast furnace; the cold air header pipe can be respectively connected with the first hot air furnace, the second hot air furnace, the third hot air furnace and the fourth hot air furnace through cold air valves with corresponding numbers; the flue gas main pipe can be respectively connected with the first hot blast stove, the second hot blast stove, the third hot blast stove and the fourth hot blast stove through corresponding flue gas valves, and is communicated with a chimney; etc. The application can solve the problem of resource waste in the prior art.
Description
Technical Field
The application relates to the technical field of hot blast stoves, in particular to a hot blast stove charging and discharging pressure system and a control method thereof.
Background
The hot blast stove can be generally divided into three working states of combustion, air supply and stewing. In the combustion state, the gas and the combustion air are combusted in the hot blast stove to generate high-temperature flue gas, the high-temperature flue gas is utilized to heat the checker bricks in the heat storage chamber, and finally the flue gas is discharged from the chimney; in the 'air supply' state, cold air enters the furnace and is heated by Gao Wenge sub-bricks, and is sent to the blast furnace. The stewing state is an intermediate state when the combustion state and the air supply state are switched, and is also a temporary state when the hot blast stove system stops supplying air. In order to provide high-pressure hot air with continuous and stable temperature for the blast furnace, part of blast furnaces are provided with 4 hot blast furnaces, and a two-firing two-feeding working system is adopted.
When the hot blast stove is in a combustion state, the flue gas generated by gas combustion can be exhausted from a chimney, so that the interior of the stove is in a low-pressure state; when the hot blast stove is in an air supply state, hot air needs to be pressed into the blast furnace, and the interior of the hot blast stove is in a high-pressure state.
Therefore, when the hot blast stove is switched into an air supply state in a combustion state, the hot blast stove needs to be pressurized, and the pressure difference between the cold air pipeline and the interior of the stove is reduced so as to open the cold air valve and the hot air valve; when the hot blast stove is changed from 'air supply' to 'combustion', the hot blast stove needs to perform pressure discharge operation, and the pressure difference between the inside of the stove and a flue gas pipeline is reduced so as to open a flue valve, a gas valve and an air valve.
At present, a cold air pressurizing mode is generally adopted for hot air furnace pressurizing operation. However, during the pressurizing process, part of cold air can enter the hot blast stove to be supplied with air, so that the blast furnace inlet wind pressure is rapidly reduced due to the reduction of the wind quantity, and the blast furnace temperature and the furnace pressure fluctuate. Even the blast furnace has poor furnace condition, which can lead to material collapse and incomplete tapping. At 3000m 3 For example, the total amount of the blast furnace inlet air quantity of the blast furnace is reduced by 2400m each time the blast furnace is changed 3 . This process corresponds to the blast furnace wind reduction production and is operated about 32 times a day. Per ton of iron loss air quantity 1000m 3 (oxygen enrichment) calculation, the daily reduction of the blast furnace is about 76.8t, and the annual reduction is up to 2.7 ten thousand t. In the hot blast furnace air discharging operation, the common method is to discharge the high-pressure air in the furnace from the chimney to the air at 3000m 3 For example, the accumulated annual emission of the blast furnace is about 2700 ten thousand m 3 Serious resource waste is caused.
Disclosure of Invention
In order to overcome the defects in the prior art, the technical problem to be solved by the embodiment of the invention is to provide a hot blast stove pressure charging and discharging system and a control method thereof, which can solve the problem of resource waste in the prior art.
The specific technical scheme of the embodiment of the invention is as follows:
a hot blast stove charging and discharging pressure system, the hot blast stove charging and discharging pressure system comprising:
a first hot blast stove; a second hot blast stove; a third hot blast stove; a fourth hot blast stove;
a hot blast main pipe which can be respectively connected with the first hot blast stove, the second hot blast stove, the third hot blast stove and the fourth hot blast stove in an on-off mode, wherein an outlet of the hot blast main pipe is communicated with a blast furnace;
the cold air header pipe can be respectively connected with the first hot air furnace, the second hot air furnace, the third hot air furnace and the fourth hot air furnace through cold air valves with corresponding numbers;
The flue gas main pipe can be respectively connected with the first hot blast stove, the second hot blast stove, the third hot blast stove and the fourth hot blast stove through corresponding flue gas valves, and is communicated with a chimney;
the exhaust gas main pipe can be respectively connected with the first hot blast stove, the second hot blast stove, the third hot blast stove and the fourth hot blast stove through corresponding exhaust gas valves, and is communicated with a chimney;
the pressurizing main pipe can be respectively connected with the first hot blast stove, the second hot blast stove, the third hot blast stove and the fourth hot blast stove through a corresponding number of pressurizing valves;
the inlet of the supercharging device can be communicated with the exhaust manifold, the outlet of the supercharging device can be communicated with the gas storage unit, and the gas storage unit can be communicated with the pressurizing manifold.
Preferably, an inlet of the supercharging device is connected with the exhaust gas main pipe through a first communication pipe, and a second cut-off valve is arranged on the first communication pipe; an air suction pipe which can be communicated with the atmosphere is connected between the inlet of the supercharging device and the second cut-off valve, and an air suction valve is arranged on the air suction pipe; and a first cut-off valve is arranged between the chimney and the junction of the first communication pipe and the exhaust manifold on the exhaust manifold.
Preferably, the outlet of the supercharging device is connected with the gas storage unit through a second communicating pipe, and a third cut-off valve is arranged on the second communicating pipe; the gas storage unit is connected with the pressurizing main pipe through a third communicating pipe, and a fourth cut-off valve is arranged on the third communicating pipe; and a diffusing pipe which can be communicated with the atmosphere is connected between the outlet of the supercharging device and the third cut-off valve, and a diffusing valve is arranged on the diffusing pipe.
Preferably, the hot blast main pipe is respectively connected with the first hot blast stove, the second hot blast stove, the third hot blast stove and the fourth hot blast stove through a corresponding number of hot blast branch pipes, and each hot blast branch pipe is provided with a hot blast valve.
Preferably, the cold air header pipe is respectively connected with the first hot air furnace, the second hot air furnace, the third hot air furnace and the fourth hot air furnace through a corresponding number of cold air branch pipes, and each cold air branch pipe is provided with a cold air valve; the pressure-charging main pipe is respectively connected with the cold air branch pipes at the downstream of each cold air valve through a corresponding number of pressure-charging branch pipes, and each pressure-charging branch pipe is provided with a pressure-charging valve; the flue gas main pipe is respectively connected with the first hot blast stove, the second hot blast stove, the third hot blast stove and the fourth hot blast stove through a corresponding number of flue gas branch pipes, and each flue gas branch pipe is provided with the flue gas valve; the exhaust manifold is respectively connected with the exhaust branch pipes at the upstream of each exhaust valve through a corresponding number of exhaust branch pipes, and the exhaust branch pipes are provided with exhaust valves.
Preferably, the pressurizing main pipe is connected with the exhaust main pipe through a bypass pipe, and a bypass valve is arranged on the bypass pipe.
Preferably, the hot blast stove charging and discharging pressure system is provided with a first state and a second state, in the first state, the second hot blast stove and the third hot blast stove are in an air supply working state, and the fourth hot blast stove is in a combustion working state;
the first hot blast stove is communicated with the exhaust gas main pipe, the exhaust gas main pipe is communicated with the supercharging device, the supercharging device is in an opening state, the exhaust gas main pipe is disconnected with the chimney, the first hot blast stove is communicated with the cold air main pipe and the hot air main pipe, the supercharging device is communicated with the gas storage unit, the gas storage unit is disconnected with the pressurizing main pipe, and when the pressure in the first hot blast stove is reduced to a second preset pressure, the smoke valve corresponding to the first hot blast stove is opened, and the first hot blast stove is disconnected with the exhaust gas main pipe;
in the second state, the first hot blast stove is in a combustion working state, and the second hot blast stove and the third hot blast stove are in an air supply working state;
The flue gas valve corresponding to the fourth hot blast furnace is in a closed state, the fourth hot blast furnace is in a communication state with the pressurizing main pipe, the gas storage unit is in a disconnection state with the waste gas main pipe, and when the pressure in the fourth hot blast furnace rises to a first preset pressure, the cold air valve and the hot air valve corresponding to the fourth hot blast furnace are opened to communicate the fourth hot blast furnace with the blast furnace.
Preferably, in the second state, after the cold air valve and the hot air valve corresponding to the fourth hot air furnace are opened and the fourth hot air furnace is communicated with the blast furnace, the second hot air furnace is in a communication state with the exhaust manifold, the exhaust manifold is in a communication state with the supercharging device, the supercharging device is in an opening state, the exhaust manifold is in a disconnection state with the chimney, the supercharging device is in a communication state with the gas storage unit, the gas storage unit is in a disconnection state with the pressurizing manifold, and when the pressure in the second hot air furnace is reduced to a second preset pressure, the smoke valve corresponding to the second hot air furnace is opened, and the second hot air furnace is disconnected with the exhaust manifold.
Preferably, an inlet of the supercharging device is connected with the exhaust gas main pipe through a first communication pipe, and a second cut-off valve is arranged on the first communication pipe; an air suction pipe which can be communicated with the atmosphere is connected between the inlet of the supercharging device and the second cut-off valve, and an air suction valve is arranged on the air suction pipe;
and in the first state, when the pressure in the gas storage unit cannot reach the fourth preset pressure, closing the second cut-off valve, opening the induced draft valve, opening the supercharging device, and supplementing the pressure in the gas storage unit to the fourth preset pressure.
A control method for a hot blast stove charging and discharging pressure system according to any one of the preceding claims, the control method comprising:
when the first hot blast stove and the second hot blast stove are in an air supply working state, the third hot blast stove and the fourth hot blast stove are in a combustion working state, the air supply of the first hot blast stove is about to be ended, the third hot blast stove needs to be switched from the combustion working state to the air supply working state in advance, firstly, the input of combustion gas and oxygen-containing gas to the third hot blast stove is stopped, a smoke valve corresponding to the third hot blast stove is closed, then the third hot blast stove is communicated with the pressurizing main pipe, the air storage unit is disconnected with the waste gas main pipe, when the pressure in the third hot blast stove is increased to a first preset pressure, the cold air valve and the hot air valve corresponding to the third hot blast stove are opened, the pressurizing of the third hot blast stove is completed, the third hot blast stove is communicated with a blast furnace, the third hot blast stove is disconnected with the pressurizing main pipe, and the air storage unit is disconnected with the pressurizing main pipe.
After that, the first hot blast stove is switched from an air supply working state to a combustion working state, the first hot blast stove is communicated with a supercharging device through an exhaust gas main pipe, the first hot blast stove is disconnected from a chimney, a cold air main pipe and a hot air main pipe, the supercharging device is opened and is communicated with the air storage unit, and the air storage unit is disconnected from the pressurizing main pipe, so that the exhaust gas in the first hot blast stove is charged into the air storage unit through the supercharging device for storage;
when the pressure in the first hot blast stove is reduced to a second preset pressure, opening the smoke valve corresponding to the first hot blast stove, disconnecting the first hot blast stove from the waste gas main pipe, discharging the pressure of the first hot blast stove, and then inputting combustion gas and oxygen-containing gas into the first hot blast stove to enable the first hot blast stove to enter a combustion state;
when the air supply working state of the second hot blast stove is about to be switched to the combustion working state, the fourth hot blast stove is required to be switched to the air supply working state from the combustion working state in advance, at the moment, the input of combustion gas and oxygen-containing gas to the fourth hot blast stove is stopped, a smoke valve corresponding to the fourth hot blast stove is closed, then the fourth hot blast stove is communicated with the pressurizing main pipe, the air storage unit is disconnected from the exhaust main pipe, when the pressure in the fourth hot blast stove is increased to a first preset pressure, the pressurizing of the fourth hot blast stove is completed, and the cold air valve corresponding to the fourth hot blast stove is opened, so that the fourth hot blast stove is communicated with a blast furnace;
After the fourth hot blast stove is switched from a combustion working state to an air supply working state, the second hot blast stove is switched from the air supply working state to the combustion working state, at the moment, the second hot blast stove is communicated with the exhaust gas main pipe, the exhaust gas main pipe is communicated with the supercharging device, the supercharging device is started, the exhaust gas main pipe is disconnected from the chimney, the supercharging device is communicated with the air storage unit, and the air storage unit is disconnected from the pressurizing main pipe, so that the exhaust gas in the second hot blast stove is charged into the air storage unit through the supercharging device for storage;
when the pressure in the second hot blast stove is reduced to a second preset pressure, the smoke valve corresponding to the second hot blast stove is opened, the second hot blast stove is disconnected from the exhaust gas main pipe, the pressure of the second hot blast stove is completed, and then combustion gas and oxygen-containing gas are input into the second hot blast stove so that the second hot blast stove enters a combustion state.
Preferably, the volumes of the first, second, third and fourth stoves are the same or different.
The technical scheme of the invention has the following remarkable beneficial effects:
1. The stability of the blast furnace inlet wind pressure is improved: the system components corresponding to the pressurization of the hot blast furnace are independent of the system components corresponding to the blast furnace blowing, the blast furnace inlet wind pressure is not influenced by the furnace changing of the hot blast furnace, and the complete undisturbed furnace changing and the furnace changing of the hot blast furnace are realized independently of the blast furnace operation.
2. The energy medium has the advantages that: the energy medium in the factory is not required to be consumed, the hot blast stove pressurizing waste gas is completely received by the gas storage unit and is then used for pressurizing the hot blast stove, the self-production and self-use can be realized, and the zero emission of the hot blast stove pressurizing waste gas is realized.
3. Energy consumption advantage: the supercharging device extracts the hot air furnace pressurized waste gas, and compared with the air draft in the atmosphere, the supercharging device has lower energy consumption.
4. Energy saving advantage: the waste gas of the hot blast stove has a certain temperature, and most of heat is recycled by recycling the waste gas.
5. Time advantage: the application can greatly shorten the pressurizing time of the hot blast stove and increase the burning time of the hot blast stove, thereby effectively improving the air supply temperature of the hot blast stove and reducing the ton iron cost of the blast furnace.
Specific embodiments of the application are disclosed in detail below with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the application are not limited in scope thereby. Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments in combination with or instead of the features of the other embodiments.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, proportional sizes, and the like of the respective components in the drawings are merely illustrative for aiding in understanding the present invention, and are not particularly limited. Those skilled in the art with access to the teachings of the present invention can select a variety of possible shapes and scale sizes to practice the present invention as the case may be.
FIG. 1 is a schematic diagram of a system for charging and discharging pressure in a hot air furnace according to an embodiment of the present invention.
Reference numerals of the above drawings:
1. a cold air main pipe; 2. a flue gas main pipe; 3. a waste gas main pipe; 4. a flue gas branch pipe; 5. a smoke valve; 6. a cold air branch pipe; 7. a cold air valve; 8. an exhaust branch pipe; 9. an exhaust valve; 11. a first pressure gauge; 121. a first hot blast stove; 122. a second hot blast stove; 123. a third hot blast stove; 124. a fourth hot blast stove; 13. a hot air branch pipe; 14. a hot air valve; 15. a hot blast main pipe; 16. a blast furnace; 17. a chimney; 18. a first shut-off valve; 19. a first communication pipe; 20. a second shut-off valve; 21. an air suction pipe; 22. an air suction valve; 23. a supercharging device; 24. a diffusing pipe; 25. a bleed valve; 26. a second communicating pipe; 27. a third shut-off valve; 28. a gas storage unit; 29. a safety valve; 30. a second pressure gauge; 31. a blow-down valve; 32. a third communicating pipe; 33. a regulating valve; 34. a fourth shut-off valve; 35. an electric control device; 36. a pressurizing main pipe; 37. a pressurizing branch pipe; 38. a pressurizing valve; 39. a bypass pipe; 40. and a bypass valve.
Detailed Description
The details of the invention will be more clearly understood in conjunction with the accompanying drawings and description of specific embodiments of the invention. However, the specific embodiments of the invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Given the teachings of the present invention, one of ordinary skill in the related art will contemplate any possible modification based on the present invention, and such should be considered to be within the scope of the present invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, may be in communication with each other in two elements, may be directly connected, or may be indirectly connected through an intermediary, and the specific meaning of the terms may be understood by those of ordinary skill in the art in view of the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In order to solve the problem of resource waste in the prior art, the application provides a hot blast stove charging and discharging system, fig. 1 is a system schematic diagram of a hot blast stove charging and discharging system in an embodiment of the application, and as shown in fig. 1, the hot blast stove charging and discharging system may include: a first hot blast stove 121; a second stove 122; a third hot blast stove 123; a fourth hot blast stove 124; a hot blast main pipe 15 which can be respectively connected with the first hot blast stove 121, the second hot blast stove 122, the third hot blast stove 123 and the fourth hot blast stove 124, wherein the outlet of the hot blast main pipe 15 is communicated with the blast furnace 16; the cold air main pipe 1 can be respectively connected with the first hot air furnace 121, the second hot air furnace 122, the third hot air furnace 123 and the fourth hot air furnace 124 through a corresponding number of cold air valves 7; the flue gas main pipe 2 can be respectively connected with the first hot blast stove 121, the second hot blast stove 122, the third hot blast stove 123 and the fourth hot blast stove 124 through a corresponding number of flue gas valves 5, and the flue gas main pipe 2 is used for being communicated with the chimney 17; the exhaust gas main pipe 3 can be respectively connected with the first hot blast stove 121, the second hot blast stove 122, the third hot blast stove 123 and the fourth hot blast stove 124 through corresponding exhaust gas valves 9, and the exhaust gas main pipe 3 is used for being communicated with the chimney 17; the pressurizing main pipe 36 can be respectively connected with the first hot blast stove 121, the second hot blast stove 122, the third hot blast stove 123 and the fourth hot blast stove 124 through a corresponding number of pressurizing valves 38; the inlet of the supercharging device 23 can be communicated with the exhaust manifold 3, the outlet of the supercharging device 23 can be communicated with the gas storage unit 28, and the gas storage unit 28 can be communicated with the pressurizing manifold 36.
As shown in fig. 1, the hot blast main 15 is respectively connected with a first hot blast stove 121, a second hot blast stove 122, a third hot blast stove 123 and a fourth hot blast stove 124 through a corresponding number of hot blast branch pipes 13, and each hot blast branch pipe 13 is provided with a hot blast valve 14, so that the on-off of the first hot blast stove 121, the second hot blast stove 122, the third hot blast stove 123 and the fourth hot blast stove 124 and the hot blast main 15 are respectively controlled through the hot blast valves 14. The outlet of the hot blast main pipe 15 is connected with a blast furnace 16 so as to realize communication.
As shown in fig. 1, the cold air header pipe 1 is respectively connected with a first hot air furnace 121, a second hot air furnace 122, a third hot air furnace 123 and a fourth hot air furnace 124 through a corresponding number of cold air branch pipes 6, each cold air branch pipe 6 is provided with a cold air valve 7, and the on-off of the first hot air furnace 121, the second hot air furnace 122, the third hot air furnace 123 and the fourth hot air furnace 124 and the cold air header pipe 1 are respectively controlled through the cold air valves 7. The cold air header pipe 1 can be communicated with the atmosphere through a blower.
As shown in fig. 1, the flue gas main pipe 2 is respectively connected with a first hot blast stove 121, a second hot blast stove 122, a third hot blast stove 123 and a fourth hot blast stove 124 through a corresponding number of flue gas branch pipes 4, each flue gas branch pipe 4 is provided with a flue gas valve 5, and the flue gas main pipe 2 is respectively controlled to be opened or closed by the flue gas valves 5. The outlet of the flue gas main pipe 2 is connected with a chimney 17 so as to be communicated with the chimney 17. A hot blast stove can be connected with the flue gas main pipe 2 through a flue gas branch pipe 4, and also can be connected with the flue gas main pipe 2 through a plurality of flue gas branch pipes 4.
As shown in fig. 1, the exhaust manifold 3 is respectively connected with the exhaust branch pipes 4 at the upstream of each exhaust valve 5 through a corresponding number of exhaust branch pipes 8, exhaust valves 9 are arranged on the exhaust branch pipes 8, and the on-off of the first hot blast stove 121, the second hot blast stove 122, the third hot blast stove 123 and the fourth hot blast stove 124 and the exhaust manifold 3 are respectively controlled through the exhaust valves 9. Each flue gas valve 5 specifically means that when one hot blast stove is connected with the flue gas main pipe 2 through one flue gas branch pipe 4, the flue gas main pipe 3 is respectively connected with the flue gas branch pipe 4 at the upstream of the flue gas valve 5 of each hot blast stove through four flue gas branch pipes 8; when a stove is connected to the main flue gas duct 2 via a plurality of flue gas branches 4, the main flue gas duct 3 is connected to the flue gas branch 4 upstream of at least one flue gas valve 5 of each stove via at least four flue gas branches 8. The outlet of the exhaust manifold 3 is connected to a stack 17 for communication with the stack 17.
As shown in fig. 1, the pressurizing manifold 36 is respectively connected with the cold air branch pipes 6 at the downstream of each cold air valve 7 through a corresponding number of pressurizing branch pipes 37, each pressurizing branch pipe 37 is provided with a pressurizing valve 38, and the on-off of the first hot blast stove 121, the second hot blast stove 122, the third hot blast stove 123 and the fourth hot blast stove 124 and the pressurizing manifold 36 are respectively controlled through the pressurizing valves 38.
As shown in fig. 1, an inlet of the supercharging device 23 is connected with the exhaust manifold 3 through a first communication pipe 19, a second shut-off valve 20 is arranged on the first communication pipe 19, and the on-off of the supercharging device 23 and the exhaust manifold 3 is controlled through the second shut-off valve 20. An air suction pipe 21 which can be communicated with the atmosphere is connected between the inlet of the supercharging device 23 and the second cut-off valve 20, an air suction valve 22 is arranged on the air suction pipe 21, and the on-off of the atmosphere and the inlet of the supercharging device 23 can be controlled through the air suction valve 22. A first cut-off valve 18 is arranged between the chimney 17 and the junction of the first communication pipe 19 and the exhaust manifold 3 on the exhaust manifold 3, and the first cut-off valve 18 is used for controlling the on-off between the outlet of the exhaust manifold 3 and the chimney 17.
As shown in fig. 1, the outlet of the pressurizing device 23 is connected with the gas storage unit 28 through the second communicating pipe 26, a third shut-off valve 27 is arranged on the second communicating pipe 26, and the on-off of the pressurizing device 23 and the gas storage unit 28 is controlled through the third shut-off valve 27. The air storage unit 28 may employ an air storage tank capable of withstanding high pressure. The gas storage unit 28 is connected to the pressure-charging manifold 36 through a third communication pipe 32, a fourth shut-off valve 34 is provided on the third communication pipe 32, and the on-off of the pressure-charging manifold 36 and the gas storage unit 28 is controlled through the fourth shut-off valve 34. A blow-off pipe 24 which can be communicated with the atmosphere is connected between the outlet of the supercharging device 23 and the third shut-off valve 27, and a blow-off valve 25 is provided on the blow-off pipe 24.
Further, a blow-down valve 31 for removing dirt inside, a second pressure gauge 30 for measuring the pressure inside the air storage unit 28, and a safety valve 29 for opening when the pressure is excessive are connected to the air storage unit 28. A regulating valve 33 may be provided on the third communication pipe 32 for regulating the flow rate of the gas when the gas storage unit 28 inputs the gas to the pressurizing manifold 36.
Further, the charging manifold 36 is connected to the exhaust manifold 3 via a bypass pipe 39, and a bypass valve 40 is provided in the bypass pipe 39.
Further, the hot blast stove charging and discharging pressure system may further comprise an electric control device 35, wherein the electric control device 35 is electrically connected to the cold blast valve 7, the flue gas valve 5, the first cut-off valve 18, the suction air valve 22, the second cut-off valve 20, the third cut-off valve 27, the fourth cut-off valve 34, the blow-off valve 25, the hot blast valve 14, the charging valve 38, the waste gas valve 9, the bypass valve 40, the suction air valve 22, the regulating valve 33, the blow-down valve 31, and the like, so as to control the valves.
Further, a first pressure gauge 11 may be provided on the flue gas branch 4, the first pressure gauge 11 may be provided upstream of the flue gas valve 5 to measure the pressure in the stove.
The hot blast stove charging and discharging pressure system at least has a first state and a second state. The first hot blast stove 121 is in a combustion operation state when the air supply operation state is completed. At the moment, the hot blast stove charging and discharging pressure system enters an intermediate state, namely a first state. In the first state, the second and third stoves 122, 123 are in an air supply operation state and the fourth stove 124 is in a combustion operation state; the first hot blast stove 121 is in a communication state with the exhaust gas main pipe 3, the exhaust gas main pipe 3 is in a communication state with the supercharging device 23, the supercharging device 23 is in an opening state, the exhaust gas main pipe 3 is in a disconnection state with the chimney 17, the first hot blast stove 121 is in a disconnection state with the cold air main pipe 1 and the hot air main pipe 15, the supercharging device 23 is in a communication state with the gas storage unit 28, the gas storage unit 28 is in a disconnection state with the pressurizing main pipe 36, and when the pressure in the first hot blast stove 121 is reduced to a second preset pressure, the smoke valve 5 corresponding to the first hot blast stove 121 is opened, and the first hot blast stove 121 is disconnected with the exhaust gas main pipe 3. In the process, the exhaust gas in the first hot blast stove 121 is compressed and charged into the gas storage unit 28. When the pressure of the flue gas branch pipe 4 is reduced to the second preset pressure, the flue gas valve 5 corresponding to the first hot blast stove 121 can be conveniently opened under a smaller pressure difference, then the waste gas valve 9 corresponding to the first hot blast stove 121 is closed, and then the valves corresponding to the combustion gas and oxygen related to the first hot blast stove 121 can be opened to enable the combustion gas and the oxygen to enter a combustion working state.
Then, the second hot blast stove 122 is required to be shifted to the combustion operation state immediately before the air supply operation state is completed. The fourth hot blast stove 124 needs to be shifted from the combustion operation state to the air supply operation state in advance, and at this time, the hot blast stove charging and discharging system enters another intermediate state, namely, the second state. In the second state, the first stove 121 is in a combustion operation state, and the second stove 122 and the third stove 123 are in an air supply operation state; the flue gas valve 5 corresponding to the fourth hot blast stove 124 is in a closed state, the fourth hot blast stove 124 is in a communication state with the pressurizing main pipe 36, the gas storage unit 28 is in a disconnection state with the exhaust main pipe 3, and when the pressure in the fourth hot blast stove 124 rises to a first preset pressure, the cold blast valve 7 and the hot blast valve 14 corresponding to the fourth hot blast stove 124 are opened to communicate the fourth hot blast stove 124 with the blast furnace 16. In this process, the exhaust gas recovered in the air storage unit 28 is charged into the fourth hot blast stove 124. When the pressure in the fourth hot blast stove 124 rises to the first preset pressure, the cold air valve 7 corresponding to the fourth hot blast stove 124 can be conveniently opened under a smaller pressure difference to enter an air supply working state, and the hot air valve corresponding to the third hot blast stove can be conveniently opened under a smaller pressure difference.
Preferably, in the first state, when the pressure in the air storage unit 28 cannot reach the fourth preset pressure, the second shut-off valve 20 may be closed, the air suction valve 22 may be opened, and the pressurizing device 23 may be opened, so that the air in the air storage unit 28 is pressurized by the pressurizing device 23 by using the air of the atmosphere until the pressure in the air storage unit 28 reaches the fourth preset pressure. During this time, the first shut-off valve 18 on the first communication pipe 19 may be closed.
Preferably, in the first state, when the air supply operation state of the first hot blast stove 121 is about to be finished and the combustion operation state of the third hot blast stove 123 is finished, the first shut-off valve 18 on the exhaust gas main pipe 3, the second shut-off valve 20 on the first communication pipe 19, and the fourth shut-off valve 34 on the third communication pipe 32 are closed, and then the pressurizing valve 38, the bypass valve 40, and the exhaust gas valve 9 corresponding to the first hot blast stove 121 corresponding to the third hot blast stove 123 are sequentially opened. At this time, the first hot blast stove 121 is communicated with the third hot blast stove 123, and the high-pressure exhaust gas in the first hot blast stove 121 directly enters the third hot blast stove 123. When the pressure difference between the first stove 121 and the third stove 123 decreases to a third preset pressure, the bypass valve 40 is closed. After that, the regulating valve 33 and the fourth shut-off valve 34 on the third communicating pipe 32, the pressurizing valve 38 corresponding to the third hot blast stove 123, the second shut-off valve 20 of the first communicating pipe 19, the third shut-off valve 27 of the second communicating pipe 26 are opened, the pressurizing means 23 is opened, the exhaust gas in the first hot blast stove 121 is inputted into the gas storage unit 28 through the increasing means 23, and the gas in the gas storage unit 28 is simultaneously charged into the third hot blast stove 123. When the pressure of the first hot blast stove 121 is reduced to the second preset pressure and the pressure of the third hot blast stove 123 is increased to the first preset pressure, the flue valve 5 corresponding to the first hot blast stove 121 and the corresponding valve of the related combustion gas and oxygen are opened, the cold blast valve 7 and the hot blast valve 14 corresponding to the third hot blast stove 123 are opened, and the third hot blast stove 123 is communicated with the blast furnace 16. At this time, the first hot blast stove 121 enters a combustion operation state, and the third hot blast stove 123 enters an air supply operation state. Finally, the waste gas valve 9 of the first hot blast stove 121, the corresponding pressurizing valve 38 of the third hot blast stove 123, the regulating valve 33 and the fourth shut-off valve 34 are closed.
In the above process, the furnace changing and pressurizing process of the hot blast stove can be divided into 2 stages, wherein the first stage uses the pressure difference naturally existing in the two hot blast stoves to transfer the waste gas in the first hot blast stove 121 at the final stage of air supply to the third hot blast stove 123 at the final stage of combustion. The stage does not need a power source or energy consumption; the second stage transfers the exhaust gas from the first hot blast stove 121 at the end of the supply to the air storage unit 28 and charges the high pressure exhaust gas from the air storage unit 28 into the fourth hot blast stove 124 at the end of combustion. This will then be sufficient for both the discharge of the first stove 121 and the charging of the fourth stove 124.
In the second state, after the cold air valve 7 and the hot air valve 14 corresponding to the fourth hot air furnace 124 are opened and the fourth hot air furnace 124 is communicated with the blast furnace 16, the second hot air furnace 122 is in a communication state with the exhaust manifold 3, the exhaust manifold 3 is in a communication state with the supercharging device 23, the supercharging device 23 is in an open state, the exhaust manifold 3 is in a disconnection state with the chimney 17, the supercharging device 23 is in a communication state with the air storage unit 28, the air storage unit 28 is in a disconnection state with the pressurizing manifold 36, and when the pressure in the second hot air furnace 122 is reduced to a second preset pressure, the flue gas valve 5 corresponding to the second hot air furnace 122 is opened and the second hot air furnace 122 is disconnected with the exhaust manifold 3. In the process, the exhaust gases from the second stove 122 are compressed and charged into the air storage unit 28 for subsequent charging of the third stove 123. When the pressure of the flue gas branch pipe 4 is reduced to the second preset pressure, the flue gas valve 5 corresponding to the second hot blast stove 122 can be conveniently opened under a smaller pressure difference, then the waste gas valve 9 corresponding to the second hot blast stove 122 is closed, and then the valves corresponding to the combustion gas and oxygen related to the second hot blast stove 122 can be opened to enable the combustion gas and the oxygen to enter a combustion working state. Then, the third hot blast stove 123 is in the air supply operation state, and the combustion operation state is required. So continuously and circularly reciprocate to meet the requirements of waste gas recovery and pressurization of a hot blast stove charging and discharging pressure system.
Preferably, under any one of the 4 hot blast stoves for the first time or under other special working conditions, the hot blast stove can be opened through the corresponding waste gas valve 9 and the first cut-off valve 18 when in pressure release, so as to be directly discharged into the chimney 17; when any one of the 4 stoves is charged for the first time, the supercharging device 23 may be activated and the suction valve 22 opened, the supercharging device 23 charging the air storage unit 28 from the atmosphere to meet the charging demand of that stove.
Preferably, when the valves on the hot blast valve 14, the combustion gas and the oxygen-containing gas corresponding to a certain hot blast stove need to be replaced, the first cut-off valve 18, the induced draft valve 22, the third cut-off valve 27 and the fourth cut-off valve 34 on the exhaust manifold 3 can be closed, the corresponding exhaust valves 9 are opened in sequence, the second cut-off valve 20 and the relief valve 25 are opened, the supercharging device 23 is started to draw air from the hot blast stove, negative pressure is formed in the hot blast stove, and accidents caused by running of hot gas in the hot blast stove from the replacement position of the valves are prevented.
Preferably, when the temperature of the equipment (such as a grate and lower refractory) in the hot blast stove is too high, the corresponding pressurizing valve 38, fourth cut-off valve 34 and regulating valve 33 of the hot blast stove can be opened, and the low-temperature gas in the gas storage unit 28 is filled from the bottom of the hot blast stove, so that the related equipment at the bottom of the hot blast stove is cooled, and the damage to the equipment in the hot blast stove and the influence on the service life of the hot blast stove due to the too high temperature are avoided.
The hot blast stove is used for pressurizing the other hot blast stove after recovering the hot blast stove pressurizing exhaust gas through the gas storage unit 28 and the pressurizing device 23. In the process, firstly, the pressurizing of the hot blast stove is independent of the working state of air supply, so that the non-disturbance stove changing of the hot blast stove can be realized; secondly, the furnace changing of the hot blast furnace is not limited by the furnace condition and operation of the blast furnace 16 any more, and the conditions of shortening the air supply time and improving the air supply temperature are provided; then, the exhaust gas discharged by the hot blast stove can be fully recycled and stored, so that no resource and energy are wasted, recycling of the exhaust gas of the stove change of the hot blast stove is realized, and the energy utilization rate is improved; finally, during the period that the hot blast stove is not disturbed to change the stove, the whole operation mode of the four hot blast stoves still keeps the conventional two-combustion two-air supply, and the operation system of the hot blast stoves is unchanged.
The application also provides a control method of the hot blast stove charging and discharging pressure system, which can comprise the following steps:
when the first hot blast stove 121 and the second hot blast stove 122 are in the air supply working state, the third hot blast stove 123 and the fourth hot blast stove 124 are in the combustion working state, the third hot blast stove 123 needs to be switched from the combustion working state to the air supply working state in advance, the air supply of the first hot blast stove 121 is about to be ended, and the air supply working state is about to be switched to the combustion working state. First, when the combustion operation state of the third hot blast stove 123 is finished, the supply of the combustion gas and the oxygen-containing gas to the third hot blast stove is stopped, the flue gas valve corresponding to the third hot blast stove is closed, the first shut-off valve 18 on the waste gas main pipe 3, the second shut-off valve 20 on the first communication pipe 19, and the fourth shut-off valve 34 on the third communication pipe 32 are closed, and then the charging valve 38, the bypass valve 40, and the waste gas valve 9 corresponding to the first hot blast stove 121 corresponding to the third hot blast stove 123 are sequentially opened. Thereby communicating the first stove 121 with the third stove 123, the high pressure exhaust gas in the first stove 121 directly entering the third stove 123. When the pressure difference between the first stove 121 and the third stove 123 decreases to a third preset pressure, the bypass valve 40 is closed.
After that, the regulating valve 33 and the fourth shut-off valve 34 on the third communicating pipe 32 are sequentially opened to communicate the gas storage unit 28 with the pressurizing manifold 36, the pressurizing valve 38 corresponding to the third hot blast stove 123 communicates the third hot blast stove 123 with the pressurizing manifold 36, and the gas storage unit 28 is disconnected from the exhaust manifold 3, thereby charging the third hot blast stove 123 with the gas in the gas storage unit 28. When the pressure of the third hot blast stove 123 rises to the first preset pressure, the cold blast valve 7 and the hot blast valve 14 corresponding to the third hot blast stove 123 are opened, the third hot blast stove 123 is pressurized, and the third hot blast stove 123 is communicated with the blast furnace 16. At this time, the third hot blast stove 123 enters the air supply operation state. And finally, closing the pressurizing valve 38, the regulating valve 33 and the fourth shut-off valve 34 corresponding to the third hot blast stove 123.
Then, when the second hot blast stove 122 is in the air supply working state, the fourth hot blast stove 124 is in the combustion working state, after the third hot blast stove 123 is switched from the combustion working state to the air supply working state, the first hot blast stove 121 is switched from the air supply working state to the combustion working state, the first hot blast stove 121 is communicated with the supercharging device 23 through the exhaust gas main pipe 3, the first hot blast stove 121 is disconnected from the chimney 17, the cold air main pipe 1 and the hot air main pipe 15, the supercharging device 23 is opened and is communicated with the air storage unit 28, and the air storage unit 28 is disconnected from the pressurizing main pipe 36, so that the exhaust gas in the first hot blast stove 121 is charged into the air storage unit 28 through the supercharging device 23 for storage.
When the pressure in the first hot blast stove 121 is reduced to the second preset pressure, the flue gas valve 5 corresponding to the first hot blast stove 121 is opened, the first hot blast stove 121 is disconnected from the waste gas main pipe 3, the pressure discharge of the first hot blast stove 121 is completed, and then combustion gas and oxygen-containing gas are input into the first hot blast stove 121 to enable the first hot blast stove 121 to enter a combustion state.
When the air supply operation state of the second hot blast stove 122 is about to be switched to the combustion operation state, the fourth hot blast stove 124 needs to be switched from the combustion operation state to the air supply operation state in advance, at this time, the input of combustion gas and oxygen-containing gas to the fourth hot blast stove 124 is stopped, the flue gas valve 5 corresponding to the fourth hot blast stove 124 is closed, then the fourth hot blast stove 124 is communicated with the pressurizing main 36, the air storage unit 28 is disconnected from the exhaust main 3, when the pressure in the fourth hot blast stove 124 rises to the first preset pressure, the pressurizing of the fourth hot blast stove 124 is completed, the cold air valve 7 corresponding to the fourth hot blast stove 124 is opened, and the fourth hot blast stove 124 is communicated with the blast furnace 16.
After the fourth hot blast stove 124 is switched from the combustion operation state to the air supply operation state, the second hot blast stove 122 is switched from the air supply operation state to the combustion operation state, at this time, the second hot blast stove 122 is communicated with the exhaust manifold 3, the exhaust manifold 3 is communicated with the supercharging device 23, the supercharging device 23 is started, the exhaust manifold 3 is disconnected from the chimney 17, the supercharging device 23 is communicated with the air storage unit 28, the air storage unit 28 is disconnected from the pressurizing manifold 36, and therefore the exhaust gas in the second hot blast stove 122 is charged into the air storage unit 28 through the supercharging device 23 for storage.
When the pressure in the second hot blast stove 122 is reduced to the second preset pressure, the flue gas valve 5 corresponding to the second hot blast stove 122 is opened, the second hot blast stove 122 is disconnected from the waste gas main pipe 3, the pressure discharge of the second hot blast stove 122 is completed, and then combustion gas and oxygen-containing gas are input into the second hot blast stove 122 to enable the second hot blast stove 122 to enter a combustion state.
Then, the third hot blast stove 123 is in the air supply operation state, and the combustion operation state is required. The third hot blast stove 123, the fourth hot blast stove 124, the first hot blast stove 121 and the second hot blast stove 122 continuously and circularly reciprocate, so that the waste gas recovery and stamping of a hot blast stove charging and discharging pressure system are met.
When the sizes of the first hot blast stove 121, the second hot blast stove 122, the third hot blast stove 123 and the fourth hot blast stove 124 are the same, when one hot blast stove is switched from the air supply working state to the combustion working state, the waste gas in the hot blast stove can be charged into the air storage unit 28 for storage through the supercharging device 23, and then when the other hot blast stove is switched from the combustion working state to the air supply working state, the waste gas stored in the air storage unit 28 is charged, and because the sizes of the four hot blast stoves are the same, the stored waste gas can meet the requirements of the next hot blast stove. Therefore, the hot blast stoves can be self-produced and self-used in the circulating process among the hot blast stoves, and the external energy medium is not required to be consumed.
When the sizes and specifications of the first hot blast stove 121, the second hot blast stove 122, the third hot blast stove 123 and the fourth hot blast stove 124 are different, the self-production and self-use among the hot blast stoves can still be realized, and the external energy medium is not required to be consumed. For example, the first hot blast stove 121 has the largest size, the waste gas in the first hot blast stove 122, the third hot blast stove 123 and the fourth hot blast stove 124 has the largest size of L before the air supply operation state is switched to the combustion operation state, and the waste gas in the second hot blast stove 122, the third hot blast stove 123 and the fourth hot blast stove 124 can only accommodate 0.8L, when the waste gas in the first hot blast stove 121 is stored in the air storage unit 28, the waste gas of L is stored in the air storage unit 28, and when the fourth hot blast stove 124 is pressurized, the air storage unit 28 only consumes 0.8L of the waste gas to meet the requirement of the fourth hot blast stove 124, so that 0.2L of the waste gas still remains in the air storage unit 28; then, the exhaust gas in the second hot blast stove 122 is stored in the gas storage unit 28, the gas storage unit 28 stores the L exhaust gas, the fourth hot blast stove 124 is pressurized, and 0.2L exhaust gas is still reserved in the gas storage unit 28. After that, the exhaust gas in the third hot blast stove 123 is stored in the gas storage unit 28, the gas storage unit 28 stores the L exhaust gas again, and then the first hot blast stove 121 is pressurized, and since the gas storage unit 28 always stores 0.2L exhaust gas for pressurizing the gas storage unit 28 by the first hot blast stove 121, the gas storage unit 28 has enough exhaust gas storage capacity to meet the requirement of the first hot blast stove 121 at this time, and after that, 0L exhaust gas is stored in the gas storage unit 28. Then, the exhaust gas in the fourth hot blast stove 124 is stored in the gas storage unit 28, 0.8L of the exhaust gas is stored in the gas storage unit 28, the second hot blast stove 122 is pressurized, and after that, 0L of the exhaust gas is reserved in the gas storage unit 28. By way of example, it has been found that the above process completes a complete cycle in which the entire hot blast stove charging and discharging system is still capable of achieving self-production between hot blast stoves at the end of a cycle without consuming external energy medium, even when the first, second, third and fourth hot blast stoves 121, 122, 123 and 124 are different in size specifications.
The application has the following beneficial effects: 1. the stability of the blast furnace inlet wind pressure is improved: the system components corresponding to the pressurizing of the hot blast furnace are independent of the system components corresponding to the blast furnace blasting, the blast furnace charging wind pressure is not influenced by the furnace changing of the hot blast furnace, and the complete undisturbed furnace changing and the furnace changing of the hot blast furnace are realized independently of the blast furnace operation; 2. the energy medium has the advantages that: the energy medium in the factory is not required to be consumed, the hot blast stove pressurizing waste gas is completely received by the gas storage unit and then is used for pressurizing the hot blast stove, so that the self-production and self-use can be realized, and the zero emission of the hot blast stove pressurizing waste gas is realized; 3. energy consumption advantage: the supercharging device extracts the hot air furnace pressurized waste gas, and compared with the air draft in the atmosphere, the supercharging device has lower energy consumption; 4. energy saving advantage: the waste gas of the hot blast stove has a certain temperature, and most of heat is recycled by recycling the waste gas; 5. time advantage: the application can greatly shorten the pressurizing time of the hot blast stove and increase the burning time of the hot blast stove, thereby effectively improving the air supply temperature of the hot blast stove and reducing the ton iron cost of the blast furnace.
All articles and references, including patent applications and publications, disclosed herein are incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not substantially affect the essential novel features of the combination. The use of the terms "comprises" or "comprising" to describe combinations of elements, components, or steps herein also contemplates embodiments consisting essentially of such elements, components, or steps. By using the term "may" herein, it is intended that any attribute described as "may" be included is optional. Multiple elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, component, section or step is not intended to exclude other elements, components, sections or steps.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other. The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
Claims (10)
1. The utility model provides a hot-blast furnace fills row pressure system which characterized in that, hot-blast furnace fills row pressure system includes:
a first hot blast stove; a second hot blast stove; a third hot blast stove; a fourth hot blast stove;
a hot blast main pipe which can be respectively connected with the first hot blast stove, the second hot blast stove, the third hot blast stove and the fourth hot blast stove in an on-off mode, wherein an outlet of the hot blast main pipe is communicated with a blast furnace;
the cold air header pipe can be respectively connected with the first hot air furnace, the second hot air furnace, the third hot air furnace and the fourth hot air furnace through cold air valves with corresponding numbers;
The flue gas main pipe can be respectively connected with the first hot blast stove, the second hot blast stove, the third hot blast stove and the fourth hot blast stove through corresponding flue gas valves, and is communicated with a chimney;
the exhaust gas main pipe can be respectively connected with the first hot blast stove, the second hot blast stove, the third hot blast stove and the fourth hot blast stove through corresponding exhaust gas valves, and is communicated with a chimney;
the pressurizing main pipe can be respectively connected with the first hot blast stove, the second hot blast stove, the third hot blast stove and the fourth hot blast stove through a corresponding number of pressurizing valves;
the inlet of the supercharging device can be communicated with the exhaust gas main pipe, the outlet of the supercharging device can be communicated with the gas storage unit, and the gas storage unit can be communicated with the pressurizing main pipe;
the hot blast stove charging and discharging pressure system is provided with a first state and a second state, in the first state, the second hot blast stove and the third hot blast stove are in an air supply working state, and the fourth hot blast stove is in a combustion working state;
the first hot blast stove is communicated with the exhaust gas main pipe, the exhaust gas main pipe is communicated with the supercharging device, the supercharging device is in an opening state, the exhaust gas main pipe is disconnected with the chimney, the first hot blast stove is communicated with the cold air main pipe and the hot air main pipe, the supercharging device is communicated with the gas storage unit, the gas storage unit is disconnected with the pressurizing main pipe, and when the pressure in the first hot blast stove is reduced to a second preset pressure, the smoke valve corresponding to the first hot blast stove is opened, and the first hot blast stove is disconnected with the exhaust gas main pipe;
In the second state, the first hot blast stove is in a combustion working state, and the second hot blast stove and the third hot blast stove are in an air supply working state;
the flue gas valve corresponding to the fourth hot blast stove is in a closed state, the fourth hot blast stove is in a communication state with the pressurizing main pipe, the gas storage unit is in a disconnection state with the waste gas main pipe, and when the pressure in the fourth hot blast stove is increased to a first preset pressure, the cold air valve and the hot air valve corresponding to the fourth hot blast stove are opened to communicate the fourth hot blast stove with the blast furnace;
when the air supply working state of the first hot blast stove is finished, the first hot blast stove needs to be switched into a combustion working state, and at the moment, the hot blast stove charging and discharging pressure system enters an intermediate state, namely the first state; when the air supply working state of the second hot blast stove is about to be ended, the second hot blast stove needs to be switched into a combustion working state, the fourth hot blast stove needs to be switched into the air supply working state from the combustion working state in advance, and at the moment, the hot blast stove charging and discharging pressure system enters another intermediate state, namely the second state.
2. The hot blast stove charging and discharging pressure system according to claim 1, wherein the inlet of said supercharging device is connected with said exhaust manifold via a first communication pipe, said first communication pipe being provided with a second shut-off valve; an air suction pipe which can be communicated with the atmosphere is connected between the inlet of the supercharging device and the second cut-off valve, and an air suction valve is arranged on the air suction pipe; and a first cut-off valve is arranged between the chimney and the junction of the first communication pipe and the exhaust manifold on the exhaust manifold.
3. The hot blast stove charging and discharging pressure system according to claim 2, wherein the outlet of said pressurizing means is connected to said gas storage unit through a second communicating pipe, and a third shut-off valve is provided on said second communicating pipe; the gas storage unit is connected with the pressurizing main pipe through a third communicating pipe, and a fourth cut-off valve is arranged on the third communicating pipe; and a diffusing pipe which can be communicated with the atmosphere is connected between the outlet of the supercharging device and the third cut-off valve, and a diffusing valve is arranged on the diffusing pipe.
4. The hot blast stove charging and discharging pressure system according to claim 1, wherein said hot blast main is connected to said first hot blast stove, said second hot blast stove, said third hot blast stove and said fourth hot blast stove respectively through a corresponding number of hot blast branch pipes, each of said hot blast branch pipes being provided with a hot blast valve.
5. The hot blast stove charging and discharging pressure system according to claim 1, wherein the cold blast main pipe is respectively connected with the first hot blast stove, the second hot blast stove, the third hot blast stove and the fourth hot blast stove through a corresponding number of cold blast branch pipes, and each cold blast branch pipe is provided with a cold blast valve; the pressure-charging main pipe is respectively connected with the cold air branch pipes at the downstream of each cold air valve through a corresponding number of pressure-charging branch pipes, and each pressure-charging branch pipe is provided with a pressure-charging valve; the flue gas main pipe is respectively connected with the first hot blast stove, the second hot blast stove, the third hot blast stove and the fourth hot blast stove through a corresponding number of flue gas branch pipes, and each flue gas branch pipe is provided with the flue gas valve; the exhaust manifold is respectively connected with the exhaust branch pipes at the upstream of each exhaust valve through a corresponding number of exhaust branch pipes, and the exhaust branch pipes are provided with exhaust valves.
6. The hot blast stove charging and discharging pressure system according to claim 5, wherein said charging manifold and said exhaust manifold are connected by a bypass pipe, and said bypass pipe is provided with a bypass valve.
7. The hot blast stove charging and discharging system according to claim 1, wherein in the second state, after the cold blast valve and the hot blast valve corresponding to the fourth hot blast stove are opened, the second hot blast stove is in a communication state with the exhaust gas main, the exhaust gas main is in a communication state with the supercharging device, the supercharging device is in an opened state, the exhaust gas main is in a disconnected state with the chimney, the supercharging device is in a communication state with the gas storage unit, the gas storage unit is in a disconnected state with the charging main, and when the pressure in the second hot blast stove is reduced to a second preset pressure, the flue gas valve corresponding to the second hot blast stove is opened, and the second hot blast stove is disconnected from the exhaust gas main.
8. The hot blast stove charging and discharging pressure system according to claim 1, wherein the inlet of said supercharging device is connected with said exhaust manifold via a first communication pipe, said first communication pipe being provided with a second shut-off valve; an air suction pipe which can be communicated with the atmosphere is connected between the inlet of the supercharging device and the second cut-off valve, and an air suction valve is arranged on the air suction pipe;
And in the first state, when the pressure in the gas storage unit cannot reach the fourth preset pressure, closing the second cut-off valve, opening the induced draft valve, and opening the supercharging device so as to supplement the pressure in the gas storage unit to the fourth preset pressure.
9. A control method using a hot blast stove charging and discharging pressure system as claimed in any one of claims 1 to 8, characterized in that the control method comprises:
when the first hot blast stove and the second hot blast stove are in an air supply working state, the third hot blast stove and the fourth hot blast stove are in a combustion working state, the air supply of the first hot blast stove is about to be ended, the third hot blast stove needs to be switched from the combustion working state to the air supply working state in advance, firstly, the input of combustion gas and oxygen-containing gas to the third hot blast stove is stopped, a smoke valve corresponding to the third hot blast stove is closed, then the third hot blast stove is communicated with the pressurizing main pipe, the air storage unit is disconnected with the waste gas main pipe, when the pressure in the third hot blast stove is increased to a first preset pressure, the cold air valve and the hot air valve corresponding to the third hot blast stove are opened, the pressurizing of the third hot blast stove is completed, the third hot blast stove is communicated with a blast furnace, the third hot blast stove is disconnected with the pressurizing main pipe, and the air storage unit is disconnected with the pressurizing main pipe.
After that, the first hot blast stove is switched from an air supply working state to a combustion working state, the first hot blast stove is communicated with a supercharging device through an exhaust gas main pipe, the first hot blast stove is disconnected from a chimney, a cold air main pipe and a hot air main pipe, the supercharging device is opened and is communicated with the air storage unit, and the air storage unit is disconnected from the pressurizing main pipe, so that the exhaust gas in the first hot blast stove is charged into the air storage unit through the supercharging device for storage;
when the pressure in the first hot blast stove is reduced to a second preset pressure, opening the smoke valve corresponding to the first hot blast stove, disconnecting the first hot blast stove from the waste gas main pipe, discharging the pressure of the first hot blast stove, and then inputting combustion gas and oxygen-containing gas into the first hot blast stove to enable the first hot blast stove to enter a combustion state;
when the air supply working state of the second hot blast stove is about to be switched to the combustion working state, the fourth hot blast stove is required to be switched to the air supply working state from the combustion working state in advance, at the moment, the input of combustion gas and oxygen-containing gas to the fourth hot blast stove is stopped, a smoke valve corresponding to the fourth hot blast stove is closed, then the fourth hot blast stove is communicated with the pressurizing main pipe, the air storage unit is disconnected from the exhaust main pipe, when the pressure in the fourth hot blast stove is increased to a first preset pressure, the pressurizing of the fourth hot blast stove is completed, and the cold air valve corresponding to the fourth hot blast stove is opened, so that the fourth hot blast stove is communicated with a blast furnace;
After the fourth hot blast stove is switched from a combustion working state to an air supply working state, the second hot blast stove is switched from the air supply working state to the combustion working state, at the moment, the second hot blast stove is communicated with the exhaust gas main pipe, the exhaust gas main pipe is communicated with the supercharging device, the supercharging device is started, the exhaust gas main pipe is disconnected from the chimney, the supercharging device is communicated with the air storage unit, and the air storage unit is disconnected from the pressurizing main pipe, so that the exhaust gas in the second hot blast stove is charged into the air storage unit through the supercharging device for storage;
when the pressure in the second hot blast stove is reduced to a second preset pressure, the smoke valve corresponding to the second hot blast stove is opened, the second hot blast stove is disconnected from the exhaust gas main pipe, the pressure of the second hot blast stove is completed, and then combustion gas and oxygen-containing gas are input into the second hot blast stove so that the second hot blast stove enters a combustion state.
10. The control method according to claim 9, characterized in that the volumes of the first, second, third and fourth stoves are the same or different.
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