CN113564294B - Efficient conversion device for non-fluctuation furnace change of hot blast stove and control method - Google Patents
Efficient conversion device for non-fluctuation furnace change of hot blast stove and control method Download PDFInfo
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- CN113564294B CN113564294B CN202110862040.7A CN202110862040A CN113564294B CN 113564294 B CN113564294 B CN 113564294B CN 202110862040 A CN202110862040 A CN 202110862040A CN 113564294 B CN113564294 B CN 113564294B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/10—Other details, e.g. blast mains
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Abstract
The invention belongs to the technical field of hot blast stoves, particularly relates to a high-efficiency conversion device for the wave-free furnace change of a hot blast stove and a control method, and discloses the high-efficiency conversion device for the wave-free furnace change of the hot blast stove, which comprises a blast blower, wherein an air outlet of the blast blower is simultaneously communicated with a first cold air main pipe and a second cold air main pipe, and a pressure equalizing valve is arranged at the connecting port of the first cold air main pipe and the blast blower; a wind pressure sensor is arranged at the connection port of the second cold air main pipe and the air blower, a second cold air main pipe air inlet valve is arranged in the second cold air main pipe at the rear end of the wind pressure sensor, the first cold air main pipe is connected with a cold air valve and a pressure charging valve on each hot blast stove through first cold air branch pipes, and wind pressure sensors are arranged at the air inlets of the first cold air branch pipes; according to the invention, the closed cold air chamber formed by the first movable plate and the second movable plate is pressurized in advance, so that the time of converting combustion into air supply of the hot air furnace is shortened, the pressure difference between the first cold air main pipe and the second cold air main pipe is reduced, and the furnace change without fluctuation is realized.
Description
Technical Field
The invention belongs to the technical field of hot blast stoves, and particularly relates to a fluctuation-free stove change efficient conversion device and a control method for a hot blast stove.
Background
The hot blast stove is an accessory device for providing high-temperature hot air for a blast furnace. In the operation of the hot blast stove, the stability and the continuity of the air supply of the blast furnace are ensured, and malignant production accidents are avoided. The production process of the hot blast stove is realized by switching the working state of each valve. Hot blast stoves generally have three states: burning, blowing and stewing. The process of switching from a combustion state to a blast state is called a converter change. It must be ensured that at least in the blast condition of one stove, the other stove can be brought into combustion or other conditions. In the existing hot blast furnace changing method, the combustion state is changed into an air supply state, a cold air pressure equalizing valve is opened by manually controlling the opening degree of the pressure equalizing valve to pressurize the furnace, and the cold air valve is opened to supply air to the blast furnace after the pressure equalizing in the furnace is finished.
Because the hot blast stove is a large container, the originally designed hot blast stove is pressurized by the wind of a blast-furnace blower, and when a pressurizing (pressure equalizing) valve is suddenly opened, the wind pressure of the blast-furnace blower is suddenly reduced, so that the fluctuation of the blast pressure is caused. The fluctuation influences the smooth operation of the furnace condition if the fluctuation is light, and causes the accident of blowing down of the tuyere by dumping the tank; therefore, the fluctuation of blast furnace air supply pressure is caused when the furnace is changed and the pressure is equalized, thereby influencing the distribution of initial coal gas flow and bringing adverse influence to blast furnace smelting.
In the existing method, an automatic control route is adopted, namely, a method for automatically controlling the opening precision of a pressure equalizing valve is adopted, so that the pressure charging valve is slowly opened, and the pressure fluctuation is controlled within an allowable range. The method still uses the air of the blast furnace blower, and the prerequisite of the method is that the blast furnace blower has abundant air volume; its defects are still fluctuation and long pressurizing time.
Disclosure of Invention
The invention provides a high-efficiency conversion device for changing a hot blast stove without fluctuation and a control method, which are used for solving the problems of long pressurizing time and fluctuation in the stove changing process of the existing hot blast stove.
In order to achieve the purpose, the invention provides the following technical scheme: a high-efficiency conversion device for the non-fluctuation furnace change of a hot blast stove comprises a blower, wherein an air outlet of the blower is simultaneously communicated with a first cold air main pipe and a second cold air main pipe; a wind pressure sensor is arranged at the connection port of the second cold air main pipe and the blast blower, a second cold air main pipe air inlet valve is arranged in the second cold air main pipe at the rear end of the wind pressure sensor, the first cold air main pipe is connected with a second cold air valve and a pressure charging valve on each hot blast stove through a first cold air branch pipe, and wind pressure sensors are arranged at the air inlets of the first cold air branch pipes; the second cold air main pipe is communicated with the cold air chambers of the hot air furnaces through second cold air branch pipes, and one ends, close to the hot air furnaces, of the second cold air branch pipes are provided with pressure charging valves;
The grate is arranged in the cold air chamber, a beam is arranged at the bottom of the grate, the lower end of the beam is fixedly connected with a grate support column, the bottom of the grate support column is fixedly connected with a foundation pouring layer, a motor chamber is arranged at the bottom of the foundation pouring layer, a first linear motor and a second linear motor which are arranged in a staggered mode are arranged in the motor chamber, the first linear motor is fixedly connected with a first sliding rod, an output shaft of the second linear motor is fixedly connected with a second sliding rod, the first sliding rod penetrates through the foundation pouring layer and is fixedly connected with a first movable plate, the second sliding rod penetrates through the foundation pouring layer and is fixedly connected with a second movable plate, the first movable plate and the second movable plate are both provided with holes in sliding connection with the grate support column, the first movable plate is positioned below the second movable plate, the first movable plate is provided with holes in sliding connection with the second sliding rod, the first movable plate is provided with first vent holes which are uniformly distributed, the second movable plate is provided with second vent holes which are uniformly distributed, the first vent holes and the second vent holes are arranged in a staggered mode, and the bottom of the second movable plate is provided with a sliding column which is in sliding connection with the first vent holes and is matched with the first vent holes.
A control method of a high-efficiency conversion device for the wave-free furnace change of a hot blast stove relates to the high-efficiency conversion device for the wave-free furnace change of the hot blast stove so as to realize the wave-free furnace change;
s1: pre-pressurizing a cold air chamber at the bottom of the hot blast stove;
s2: when a certain combustion furnace needs to transfer wind from combustion, the control system enables the cold air chamber to be communicated with the top space of the cold air chamber by controlling the motion of the first linear motor and the second linear motor, and the pre-charging gas in the cold air chamber pre-charges the top space of the cold air chamber of the hot blast stove;
s3, after pre-pressurizing the top space of the cold air chamber of the hot air furnace by pre-pressurizing gas in the cold air chamber, pressurizing the cold air chamber of the combustion furnace by a pressure equalizing valve;
s4, in the process of pressurizing the cold air chamber, if a wind pressure sensor corresponding to the hot-blast stove which is blowing air detects that the wind pressure is lower than a preset value, starting the second cold air main pipe, and closing the first cold air main pipe to ensure that the wind pressure of the blowing air in the hot-blast stove which is blowing air is kept stable;
s5, the controller controls pre-pressurized gas in the cold air chambers of the other combustion furnaces to supplement pressure to the first cold air main pipe and the cold air chamber of the combustion transfer air furnace, and simultaneously controls a pressure equalizing valve at the air inlet end of the first cold air main pipe to supplement pressure to the first cold air main pipe and the cold air chamber of the combustion transfer air furnace;
S6, stopping pre-charging gas in the cold air chambers of the other combustion furnaces to perform pressure compensation on the first cold air main pipe and the cold air chambers of the combustion transfer air furnace after pressure compensation is completed, closing the second cold air main pipe, and starting the first cold air main pipe;
s7, repeating the steps S-S; completing pressurizing of the hot blast stove for transferring and supplying air for combustion;
s8, after the pressurization is finished, a second cold air valve of the hot blast stove for combustion and air supply conversion is opened, so that the wave-free furnace change is realized;
s9, controlling the first linear motor and the second linear motor to start and drive the first movable plate and the second movable plate to move upwards to the top of the cold air chamber to form a closed space;
s10: when the air supply hot blast stove is in an air supply stage, the pre-charging is carried out on a cold air chamber at the bottom of the hot blast stove by controlling a pressure equalizing valve of the hot blast stove which needs to be converted from air supply to combustion, and preparation is made for the furnace changing of the hot blast stove which is converted from subsequent combustion to air supply.
Compared with the prior art, the invention has at least the following beneficial effects:
1. according to the invention, through mutual matching of the valves of the first moving plate, the second moving plate, the air blower and the like, and pre-pressurizing the closed cold air chamber formed by the first moving plate and the second moving plate, when air is transferred during combustion, the control system enables the cold air chamber to be communicated with the top space of the cold air chamber by controlling the movement of the first linear motor and the second linear motor, and the pre-pressurized air in the cold air chamber pre-pressurizes the top space of the cold air chamber of the hot air furnace, so that the time of the hot air furnace for transferring air from combustion to air supply is shortened.
2. According to the invention, through mutual matching of the valves of the first movable plate, the second movable plate, the air blower and the like, when the cold air chamber at the bottom of the hot blast stove in a combustion state is pressurized by utilizing gas stored in the cold air chamber at the bottom of the hot blast stove, the pressure difference between the first cold air main pipe and the second cold air main pipe is reduced, so that the furnace changing without fluctuation is realized.
3. According to the invention, through the mutual matching of the valves of the first moving plate, the second moving plate, the air blower and the like, when the hot blast stove is converted from air supply to combustion, the first linear motor and the second linear motor are controlled by the controller to jointly push the first moving plate and the second moving plate to jointly move upwards and push the upper space airflow to move upwards, so that the first moving plate and the second moving plate push the waste air in the hot blast stove to be quickly discharged, the stove changing time is reduced, and the working efficiency is improved.
4. According to the invention, through the mutual matching of the valves of the first moving plate, the second moving plate, the air blower and the like, the controller controls the second linear motor to start and drive the second moving plate to move downwards to be in contact with the first moving plate and not completely form a sealed environment, so that the flow of air flowing from the vent holes of the first moving plate and the second moving plate is reduced when the first moving plate and the second moving plate move in the cold air chamber; then the controller controls the first linear motor and the second linear motor to jointly push the first movable disc and the second movable disc to jointly move upwards and push the upper space airflow to move upwards, and then the first movable disc and the second movable disc push the waste air in the hot blast stove to be quickly discharged.
Drawings
FIG. 1 is a schematic view of embodiment 1 of the present invention;
FIG. 2 is a schematic three-dimensional structure of embodiment 2 of the present invention;
FIG. 3 is a schematic three-dimensional structure of a single hot blast stove in embodiment 2 of the present invention;
FIG. 4 is an overall configuration diagram of a single hot blast stove in embodiment 2 of the present invention;
FIG. 5 is an enlarged view of portion A of FIG. 4 according to the present invention;
FIG. 6 is an internal sectional view of a hot blast stove according to embodiment 2 of the present invention;
FIG. 7 is an enlarged view of portion B of FIG. 6 according to the present invention;
fig. 8 is a schematic view of the connection of the grate support posts, cross beams, first movable plate and second movable plate of the present invention;
fig. 9 is a schematic diagram of embodiment 2 of the present invention.
In the figure: 1. a blower; 2. an air compressor; 3. a gas storage tank; 4. a pressure reducing valve; 5. a hot blast stove; 6. a first slide bar; 7. a first cold air valve; 8. a differential pressure gauge; 9. a safety valve; 10. a pressure equalizing valve; 11. a wind pressure sensor; 12. a second cold air valve; 13. a pressure charging valve; 14. a cold air chamber; 15. a grate; 16. a cross beam; 17. a grate support; 18. a second slide bar; 19. a first linear motor; 20. a second linear motor; 21. a first movable tray; 2101. a first vent hole; 22. a second movable tray; 2201. a second vent hole; 2202. a sliding post.
Detailed Description
Embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
the invention relates to a high-efficiency conversion device for blast furnace wave-free furnace change, which comprises a blast blower 1 and an air compressor 2, wherein the air compressor 2 is connected with an air inlet valve of an air storage tank 3, an air outlet of the air storage tank 3 is communicated with a pressurizing pipeline through a pressure reducing valve 4, the pressurizing pipeline is connected with a pressurizing valve 13 of each blast furnace 5, the bottom of each blast furnace 5 is provided with a first cold air valve 7, the first cold air valves 7 are connected with the blast blower 1 through a cold air main pipe, a differential pressure gauge 8 is arranged between the cold air main pipe and the pressurizing pipeline, and a flow meter is arranged in the pressurizing pipeline at the rear end of the 4-door pressure reducing valve; the gas storage tank 3 is provided with a safety valve 9.
When the hot blast stove 5 is changed into an air supply state from a combustion state, an exhaust valve of the air storage tank 3 is opened, high-pressure air in the air compressor 2 is decompressed to be the same as air pressure in a cold air main pipe through a decompression valve 4, a pressure charging valve 13 of the hot blast stove 5 which needs to be changed into the air supply state from the combustion state is opened, and air in the air storage tank 3 enters the hot blast stove 5 through an inflation pipe and the pressure charging valve 13 and charges the hot blast stove 5; the air pressure in the hot blast stove 5 is equal to the air pressure in the cold air main pipe, thereby avoiding cold air pressure fluctuation caused by the common use of cold air for air supply and pressurization, and ensuring the continuous and stable air supply of the hot blast stove 5; after the pressurization is finished, closing an exhaust valve of the gas storage tank 3, and opening a first cold air valve 7 and a hot air valve on the hot air furnace 5 to enable the hot air furnace 5 to enter an air supply state; thereby completing the furnace replacement without fluctuation.
Example 2:
the inventor finds that the arrangement of the air compressor and the air supply station requires a large amount of land and capital, which increases the burden and risk for the enterprise to build a factory, and therefore, the inventor further improves the arrangement based on the embodiment 1.
The invention relates to a non-fluctuation furnace-changing efficient conversion device of a hot blast stove 5, which comprises a blower 1, wherein an air outlet of the blower 1 is simultaneously communicated with a first cold air main pipe and a second cold air main pipe, and a pressure equalizing valve 10 is arranged at a connecting port of the first cold air main pipe and the blower 1; a wind pressure sensor 11 is arranged at the connecting port of the second cold air main pipe and the blower 1, a second cold air main pipe air inlet valve is arranged in the second cold air main pipe at the rear end of the wind pressure sensor 11, the first cold air main pipe is connected with a second cold air valve 12 and a pressure charging valve 13 on each hot blast stove 5 through a first cold air branch pipe, and wind pressure sensors 11 are arranged at the air inlets of the first cold air branch pipes; the second cold air main pipe is communicated with the cold air chambers 14 of the hot air furnaces 5 through second cold air branch pipes, and one ends, close to the hot air furnaces 5, of the second cold air branch pipes are provided with pressure charging valves 13.
Be equipped with grate 15 in the cold air chamber 14, grate 15 bottom is equipped with crossbeam 16, and 16 lower extremes of crossbeam and grate pillar 17 fixed connection, grate pillar 17 bottom and the layer fixed connection are pour to the basis, and the layer bottom is pour to the basis is equipped with the motor room.
The top of the grate 15 is provided with a lattice brick, the lattice brick is internally provided with brick lattice holes, and the brick lattice holes are communicated with the second vent holes 2201 and are on the same axis; through the arrangement of the brick grid holes communicated with the second vent holes 2201, cold air can smoothly pass through the brick holes during air supply; the checker brick structure is a horizontal airflow channel and a longitudinal airflow channel which are connected by pores in the transverse direction, and the self-regulation of uneven flue gas and cold air flow fields is realized under the action of certain differential pressure and differential resistance, so that the purpose of efficient heat storage and heat exchange is achieved; a heat insulation layer is arranged on the surface of the foundation pouring layer; the number of the first vent holes 2101 and the second vent holes 2201 is the same as that of the brick grid holes; the top of the beam 16 is symmetrically provided with bulges which are used for supporting the checker bricks and limiting the checker bricks; through setting up the arch, reduce the area of contact of crossbeam 16 and checker brick, reduce the shutoff of crossbeam 16 to the brick check hole on the checker brick.
The first linear motor 19 and the second linear motor 20 are arranged in the motor chamber in a staggered mode, the first linear motor 19 is fixedly connected with the first sliding rod 6, an output shaft of the second linear motor 20 is fixedly connected with the second sliding rod 18, the first sliding rod 6 penetrates through a basic pouring layer and is fixedly connected with the first moving disk 21, the second sliding rod 18 penetrates through the basic pouring layer and is fixedly connected with the second moving disk 22, holes in sliding connection with the grate support posts 17 are formed in the first moving disk 21 and the second moving disk 22, the first moving disk 21 is located below the second moving disk 22, holes in sliding connection with the second sliding rod 18 are formed in the first moving disk 21, first vent holes 2101 are uniformly arranged in the first moving disk 21, second vent holes 2201 are uniformly arranged in the second moving disk 22, the first vent holes 2101 and the second vent holes 2201 are arranged in a staggered mode, and sliding columns 2202 in sliding connection and matching with the first vent holes 2101 are arranged at the bottom of the second moving disk 22.
The first vent hole 2101 is of an inverted circular truncated cone shape, and the sliding column 2202 is of an inverted circular truncated cone shape that matches the shape of the first vent hole 2101. By providing the first air vent hole 2101 with an inverted truncated cone shape, the first air vent hole 2101 and the sliding column 2202 are facilitated to be butted, and it is facilitated that the first moving tray 21 and the second moving tray 22 form a closed space.
For the convenience of understanding, the hot blast stoves 5 from left to right in the figure are named as follows: the inventor describes the present apparatus in detail by taking the first hot blast stove 5 as a combustion-to-air blast, the second and third hot blast stoves 5 as a combustion state, and the fourth hot blast stove 5 as an air blast state as an example.
In use, before the whole combustion air supply, the first linear motor 19 and the second linear motor 20 are started and drive the first moving plate 21 and the second moving plate 22 to move upwards together, the first moving plate 21 and the second moving plate 22 slide upwards along the grate support column 17 and reach the top dead center, and the sliding column 2202 is positioned in the first vent hole 2101 and forms a sealed space; then, pressurizing the cold air chamber 14 of each hot air furnace 5, storing the air in the cold air chamber 14, when the air is transferred from the combustion after the hot air furnaces 5 are combusted, completely opening a pressure equalizing valve 10 at the connection port of a first cold air main pipe and an air blower 1 by opening an air inlet valve of a second cold air main pipe and opening a second cold air valve 12, and then starting the air blower 1 to blow air, so that the air blower 1 blows all the cold air chambers 14 in a constant air volume mode, and the cold air chambers 14 are filled with cold air by controlling the air blowing time of the air blower 1; after the blowing of the cold air compartment 14 is completed; closing the air inlet valve of the second cold air main pipe and closing the pressurizing valve 13; the second cold air valve 12 is closed; when the hot blast stove 5 transfers wind from combustion to air supply, the first stove is used for transferring wind to the second stove and the third stove are used for combustion, the fourth stove is used for transferring wind to the air supply, when the first stove needs to transfer wind from combustion to air supply, the first linear motor 19 is started to drive the first moving plate 21 to move downwards, the first vent hole 2101 on the first moving plate 21 and the sliding column 2202 on the second moving plate 22 are changed from sealing to ventilation, pre-pressurized gas in the cold air chamber 14 enters the heat storage chamber, the air pressure in the heat storage chamber and the combustion chamber of the hot blast stove 5 is increased, the first vent hole 2101 on the first moving plate 21 and the sliding column 2202 on the second moving plate 22 are changed from sealing to ventilation and then from ventilation to complete separation, the gas in the cold air chamber 14 is rapidly diffused to the top of the hot blast stove 5, when the first moving plate 21 moves to the bottommost, the first linear motor 19 drives the first movable disc 21 to move upwards and form sealing with the second movable disc 22, then the air blower 1 is adjusted to be in a constant air pressure working mode, the pressure equalizing valve 10 is opened again, so that a part of air blown out by the air blower 1 is adjusted to charge the cold air chamber 14 of the first hot air furnace 5, and in the pressure equalizing process, when the air pressure sensor 11 in a branch pipe of the fourth hot air furnace 5 detects that the air pressure is smaller than a preset value, the preset value is stable air supply pressure required by production; it is explained that because the air pressure of the first cold air chamber 14 is lower than the air pressure of the pipeline, and then the pressure equalizing valve 10 of the first hot air furnace 5 is opened, the air pressure in the pipeline changes sharply to cause the change of the air pressure of the air fed by the fourth hot air furnace 5, at this time, although the blower 1 can perform pressurization adjustment, but the long-distance pipeline conveying can not cause the air fed into the fourth hot air furnace 5 to recover to stable air pressure, therefore, when the air pressure sensor 11 in the branch pipe of the fourth hot air furnace 5 detects that the air pressure is less than a preset value, the controller controls the second cold air valve 12 of the fourth hot air furnace 5 to close, controls the pressurizing valve 13 of the fourth hot air furnace 5 to open and open the air inlet valve of the second cold air main pipe, closes the pressure equalizing valve 10 at the connection port of the first cold air main pipe and the blower 1, causes the first cold air main pipe to stop blowing air, causes the second cold air main pipe to blow air to the fourth hot air furnace 5, because the second cold air main pipe has been pressurized to a stable air pressure state in advance, the fourth hot blast stove 5 is switched to quickly recover to stable wind pressure by the above mode to reduce fluctuation, after the first cold blast main pipe stops supplying air, the second cold blast main pipe starts supplying air, the pressure charging valve 13 of the second and third stoves is opened to make the gas pre-charged in the second and third stoves supplement pressure to the first cold blast main pipe and the first stove cold blast chamber 14, meanwhile, the first cold blast main pipe and the pressure equalizing valve 10 at the connection port of the air blower 1 carry out pressure equalization, because the gas pre-charged in the second and third stoves supplement pressure to the first cold blast main pipe and the first stove cold blast chamber 14, the pressure difference between the first cold blast main pipe and the second cold blast main pipe is reduced, further, the first cold blast main pipe and the pressure equalizing valve 10 at the connection port of the air blower 1 carry out pressure equalization, the air pressure fluctuation of the second cold blast main pipe is reduced, the wind pressure sensor 11 at the air inlet valve of the second cold blast main pipe carries out real-time detection, when the wind pressure sensor 11 at the air inlet valve of the second cold blast main pipe detects that the wind pressure is smaller than a preset value, the pressure equalizing valve 10 at the connecting port of the first cold air main pipe and the air blower 1 is closed and stops equalizing pressure, the air blower 1 is adjusted in time, and the air pressure change is changed at the outlet of the air blower 1, so that the air pressure in the second cold air main pipe can be quickly recovered to stable air pressure through adjustment, and the fluctuation of the air supply pressure of the furnace No. four due to the pressure equalization to the first cold air main pipe is avoided, and the purpose of realizing the pressure charging to the furnace No. one without fluctuation is realized; when a wind pressure sensor 11 at a second cold air main pipe air inlet valve detects that wind pressure reaches a preset value, a pressure equalizing valve 10 at a connecting port of a first cold air main pipe and a blower 1 is restarted and pressurizes a first cold air main pipe and a second and third furnace cold air chambers 14, when the wind pressure detected by the wind pressure sensor 11 in a first cold air branch pipe of the second and third furnaces reaches the preset value, the fact that the air pressure of the first cold air main pipe recovers to the preset value is explained, then a second and third furnace pressurizing valve 13 is closed, a second cold air main pipe air inlet valve is closed, a fourth furnace pressurizing valve 13 is closed, meanwhile, a pressure equalizing valve 10 at a connecting port of the first cold air main pipe and the blower 1 is completely opened, a fourth furnace second cold air valve 12 is opened, the first cold air main pipe undertakes air supply work, and the second cold air main pipe stops air supply work; the first furnace pressure equalizing valve 10 is opened, pressure equalizing is continuously carried out on the first furnace cold air chamber 14, and air pressure is only required to be charged into the cold air chamber 14 at the moment, so that the pressure equalizing device is compared with the whole hot air furnace 5, the pressure charging volume is small, the influence on air pressure fluctuation in the first cold air main pipe is small, and the condition that air supply pressure of the fourth furnace is changed due to the large influence of air pressure fluctuation of the first cold air main pipe is avoided. After the cold air chamber 14 of the first furnace is pressurized, repeating the steps until the whole pressurization of the first furnace is completed; after the pressurization is finished, a second cold air valve 12 of the hot air furnace 5 for combustion and air supply is opened, so that the furnace change without fluctuation is realized.
It should be emphasized that, during air supply, the first movable tray 21 is located at the top of the cold air chamber 14, the second movable tray 22 is located at the bottom of the cold air chamber 14, and air entering the cold air chamber 14 enters the top space of the cold air chamber 14 through the first air vent 2101 and the second air vent 2201.
When air supply is changed into combustion, waste air needs to be discharged firstly, and then the state can be changed into a combustion state, and when the waste air is discharged, the controller controls the second linear motor 20 to be started and drives the second movable disc 22 to move downwards to be in contact with the first movable disc 21 and not to completely form a sealed environment, so that the first movable disc 21 and the second movable disc 22 can reduce the flow rate of air flow from the air vent when the air flow moves in the cold air chamber 14; then the controller controls the first linear motor 19 and the second linear motor 20 to jointly push the first moving plate 21 and the second moving plate 22 to jointly move upwards and push the upper space airflow to upwards move, so that the first moving plate 21 and the second moving plate 22 push the waste air in the hot blast stove 5 to quickly discharge, when the waste air moves to the top of the cold air chamber 14, the controller controls the first linear motor 19 to drive the first moving plate 21 to downwards move firstly, and after the first moving plate 21 moves to the bottom of the cold air chamber 14, the controller controls the second linear motor 20 to start and drive the second moving plate 22 to downwards move, and the operations are repeated, so that the waste air in the hot blast stove 5 is quickly discharged, the stove changing time is reduced, and the working efficiency is improved; after the waste air is exhausted, the controller controls the first linear motor 19 and the second linear motor 20 to start and drive the first movable plate 21 and the second movable plate 22 to move upwards to the top of the cold air chamber to form a closed space. When the air supply hot blast stove 5 is in an air supply stage, pre-charging is carried out on a cold air chamber 14 at the bottom of the hot blast stove 5 by controlling a pressure equalizing valve 10 of the hot blast stove 5 which needs to be converted from air supply to combustion, in the pre-charging process, when a wind pressure sensor 11 corresponding to the air supply hot blast stove 5 detects that the wind pressure is smaller than a preset value, an air blower 1 changes from constant wind quantity to constant pressure air supply, meanwhile, a controller controls a second cold air valve 12 of the hot blast stove 5 in an air supply state to be closed, controls a pressure equalizing valve 13 in the air supply state to be opened, opens a second cold air main pipe air inlet valve, closes the pressure equalizing valve 10 at the connecting port of a first cold air main pipe and the air blower 1, so that the first cold air main pipe stops air supply, and the second cold air main pipe supplies air to the air in the air supply state; when a wind pressure sensor 11 at the air inlet valve of the second cold air main pipe detects that the wind pressure is larger than a preset value, a pressure equalizing valve 10 at the connecting port of the first cold air main pipe and the air blower 1 is opened and pressure is supplemented to the first cold air main pipe and the hot air furnace 5 for combustion and air supply, after pressure supplementation is completed, the pressure equalizing valve 10 of the hot air furnace 5 for combustion and air supply is closed, the air inlet valve of the second cold air main pipe is closed, a pressure charging valve 13 of the air supply furnace is closed, the pressure equalizing valve 10 at the connecting port of the first cold air main pipe and the air blower 1 is completely opened, and the second cold air valve 12 of the air supply furnace is opened, so that the first cold air main pipe undertakes air supply work, and the second cold air main pipe stops air supply work; and the blower changes from constant pressure air supply to constant air volume air supply; thereby completing the pre-pressurization and preparing for the air supply of the subsequent combustion.
According to the invention, through mutual matching of the valves of the first movable disc 21, the second movable disc 22, the blower 1 and the like, in a first aspect; the time for converting combustion into air supply of the hot blast stove 5 is shortened by pre-pressurizing a closed cold air chamber 14 consisting of a first movable plate 21 and a second movable plate 22 in advance; a second aspect; when the cold air chambers at the bottoms of the first cold air main pipe and the combustion air-transferring hot air furnace 5 are pressurized by utilizing the gas stored in the cold air chamber 14 at the bottom of the hot air furnace 5 in a combustion state, the pressure difference between the first cold air main pipe and the second cold air main pipe is reduced, so that the fluctuation-free furnace change is realized; a third aspect; when the hot blast stove 5 is changed from air supply to combustion, the controller controls the first linear motor 19 and the second linear motor 20 to jointly push the first movable disc 21 and the second movable disc 22 to jointly move upwards and push the upper space airflow to move upwards, so that the first movable disc 21 and the second movable disc 22 push the waste air in the hot blast stove 5 to be quickly discharged, the stove changing time is shortened, and the working efficiency is improved.
A control method of a high-efficiency conversion device for the wave-free furnace change of a hot blast stove relates to the high-efficiency conversion device for the wave-free furnace change of the hot blast stove so as to realize the wave-free furnace change, and comprises the following specific steps:
S1: pre-pressurizing the cold air chamber 14 at the bottom of the hot air furnace 5;
s11: before the whole hot blast stove 5 equipment works, the controller starts the first linear motor 19 and the second linear motor 20 and drives the first movable disk 21 and the second movable disk 22 to move upwards together, so that the first movable disk 21, the second movable disk 22 and the bottom of the hot blast stove 5 form a sealed cold air chamber 14 together;
s12, opening an air inlet valve of a second cold air main pipe, opening a second cold air valve 12, opening a pressure equalizing valve 10 at a connection port of a first cold air main pipe and the air blower 1, and then starting the air blower 1 to blow air, so that the air blower 1 pressurizes all cold air chambers 14 in a constant air volume mode;
and S13, after the pre-charging of the cold air chamber 14 is completed, closing the air inlet valve of the second cold air main pipe, closing the pressure charging valve 13 and closing the second cold air valve 12.
S2: when a certain combustion furnace needs to transfer wind from combustion, the control system enables the cold air chamber 14 to be communicated with the top space of the cold air chamber 14 by controlling the movement of the first linear motor 19 and the second linear motor 20, and pre-charging gas in the cold air chamber 14 pre-charges the top space of the cold air chamber 14 of the hot blast stove 5;
s21: when the hot blast stove 5 transfers wind by combustion, firstly, a first linear motor 19 corresponding to the hot blast stove 5 which transfers wind by combustion is started and drives a first movable disc 21 to move downwards, so that a first vent hole 2101 on the first movable disc 21 and a second movable disc 22 are changed from sealing to ventilation, and then the pre-pressurized gas in the cold air chamber 14 pre-pressurizes the top space of the cold air chamber 14;
S22: after the pre-charging of the top space of the cold air chamber 14 by the pre-charging gas in the cold air chamber 14 is completed, the controller controls the first linear motor 19 to extend upwards and drive the first movable tray 21 to move upwards and form a closed environment with the second movable tray 22, so that the cold air chamber 14 forms a closed space.
S3, after the pre-charging of the top space of the cold air chamber 14 of the hot blast stove 5 by the pre-charging gas in the cold air chamber 14 is finished, the cold air chamber 14 of the combustion furnace is charged by a pressure equalizing valve;
s31: after the pre-charging gas in the cold air chamber 14 finishes the pre-charging of the top space of the cold air chamber 14 of the hot blast stove 5, the controller controls the air blower 1 to be changed from a constant air volume to a constant air pressure working mode;
s32: opening a pressure equalizing valve 10 to make part of the air blown by the air blower 1 adjusted and distributed to a cold air chamber 14 of a furnace for combustion and air supply conversion for pressurization;
s4, in the process of pressurizing the cold air chamber 14, if the wind pressure sensor 11 corresponding to the hot air furnace 5 which is blowing air detects that the wind pressure is lower than a preset value, starting the second cold air main pipe, and closing the first cold air main pipe to ensure that the air blowing pressure in the hot air furnace 5 which is blowing air is kept stable;
s41: when a wind pressure sensor 11 corresponding to the air supply furnace detects that the wind pressure is smaller than a preset value, the controller controls a second cold air valve 12 of the hot blast stove 5 in an air supply state to be closed, controls a pressure charging valve 13 in the air supply state to open and open an air inlet valve of a second cold air main pipe, closes a pressure equalizing valve 10 at a connection port of the first cold air main pipe and the air blower 1, enables the first cold air main pipe to stop supplying air, and enables the second cold air main pipe to supply air in the air supply state;
S5, the controller controls the pre-pressurized gas in the cold air chambers 14 of the other combustion furnaces to supplement the pressure to the cold air chambers 14 of the first cold air main pipe and the combustion transfer air furnace, and simultaneously controls the pressure equalizing valve 10 at the air inlet end of the first cold air main pipe to supplement the pressure to the cold air chambers 14 of the first cold air main pipe and the combustion transfer air furnace;
s51: the controller controls a pressure charging valve 13 of the hot blast stove 5 in a combustion state to be opened, so that gas in a cold air chamber 14 of the hot blast stove 5 in the combustion state supplies pressure to a first cold air main pipe and a first stove cold air chamber 14, and controls a pressure equalizing valve 10 at the connection port of the first cold air main pipe and the air blower 1 to equalize pressure, so that the pressure difference between the first cold air main pipe and a second cold air main pipe is reduced, the pressure equalizing valve 10 at the connection port of the first cold air main pipe and the air blower 1 equalizes pressure, and the air pressure fluctuation of the second cold air main pipe is reduced;
s52: when a wind pressure sensor 11 at the air inlet valve of the second cold air main pipe detects that the wind pressure is smaller than a preset value, a pressure equalizing valve 10 at the connection port of the first cold air main pipe and the air blower 1 is closed to stop equalizing the pressure, the air blower 1 is adjusted in time, and the air pressure in the second cold air main pipe is quickly restored to a stable air pressure through adjustment;
S6, stopping pre-charging gas in the cold air chambers 14 of the other combustion furnaces to perform pressure compensation on the first cold air main pipe and the cold air chambers 14 of the combustion transfer air furnace after pressure compensation is completed, closing the second cold air main pipe, and starting the first cold air main pipe;
s61: when the wind pressure sensor 11 at the air inlet valve of the second cold air main pipe detects that the wind pressure reaches a preset value, the pressure equalizing valve 10 at the connecting port of the first cold air main pipe and the air blower 1 is started again, and the first cold air main pipe and the combustion furnace cold air chamber 14 are pressurized;
s62: when the wind pressure detected by a wind pressure sensor 11 in a first cold wind branch pipe of the combustion furnace reaches a preset value, closing a pressure-charging valve 13 of the combustion furnace, closing an air inlet valve of a second cold wind main pipe, closing a pressure-charging valve 13 of the air supply furnace, simultaneously completely opening a pressure-equalizing valve 10 at the connection port of the first cold wind main pipe and the air blower 1, and opening a second cold wind valve 12 of the air supply furnace, so that the first cold wind main pipe bears air supply work, and the second cold wind main pipe stops air supply work;
s63: the controller controls the pressure equalizing valve 10 of the combustion transfer air furnace to open, and the pressure equalization is continuously carried out on a cold air chamber 14 of the combustion transfer air furnace;
s7, repeating the steps S2-S6; completing the pressurization of the hot blast stove 5 for transferring combustion to air supply;
S8, after the pressurization is finished, a second cold air valve 12 of the hot blast stove 5 for combustion and air supply is opened, so that the furnace change without fluctuation is realized;
s9, controlling the first linear motor 19 and the second linear motor 20 to start and drive the first movable tray 21 and the second movable tray 22 to move upwards to the top of the cold air chamber to form a closed space;
s10: when the air supply hot blast stove 5 is in the air supply stage, pre-charging is carried out on a cold air chamber 14 at the bottom of the hot blast stove 5 by controlling a pressure equalizing valve 10 of the air supply hot blast stove 5 which needs to be converted into combustion, so as to prepare for the furnace change of the subsequent combustion hot blast stove 5 which is converted into air supply;
s101 in the pre-charging process, when a wind pressure sensor 11 corresponding to a hot blast stove 5 in an air supply state detects that wind pressure is smaller than a preset value, a blower 1 changes constant wind volume into constant pressure air supply, meanwhile, a controller controls a second cold wind valve 12 of the hot blast stove 5 in the air supply state to be closed, controls a charging valve 12 in the air supply state to be opened, opens an air inlet valve of a second cold wind main pipe, closes a pressure equalizing valve 10 at the connection port of a first cold wind main pipe and the blower 1, enables the first cold wind main pipe to stop air supply, and enables the second cold wind main pipe to supply air in the air supply state;
s102, when the wind pressure sensor 11 at the air inlet valve of the second cold air main pipe detects that the wind pressure is larger than a preset value, controlling a pressure equalizing valve 10 at the connecting port of the first cold air main pipe and the air blower 1 to open and supplement pressure to the first cold air main pipe and the hot blast stove 5 for burning and supplying air;
S103, after pressure compensation is completed, closing a pressure equalizing valve 10 of a hot blast stove 5 for burning and transferring air, closing an air inlet valve of a second cold air main pipe, closing a pressure charging valve 12 of the air blast stove, completely opening the pressure equalizing valve 10 at the connection port of a first cold air main pipe and a blower 1, and opening a second cold air valve 12 of the air blast stove to enable the first cold air main pipe to undertake air supply work, and stop air supply work of the second cold air main pipe; and the blower 1 is changed from constant pressure air supply to constant air volume air supply; thereby completing the pre-charging and preparing for the furnace changing of the hot blast stove 5 which is subsequently burnt and changed into air supply.
The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (10)
1. The utility model provides a high-efficient conversion equipment of stove is traded to no fluctuation of hot-blast furnace, includes the air-blower, its characterized in that: the air outlet of the air blower is simultaneously communicated with a first cold air main pipe and a second cold air main pipe, and a pressure equalizing valve is arranged at the connecting port of the first cold air main pipe and the air blower; a wind pressure sensor is arranged at the connection port of the second cold air main pipe and the air blower, a second cold air main pipe air inlet valve is arranged in the second cold air main pipe at the rear end of the wind pressure sensor, the first cold air main pipe is connected with a second cold air valve and a pressure charging valve on each hot blast stove through first cold air branch pipes, and wind pressure sensors are arranged at air inlets of the first cold air branch pipes; the second cold air main pipe is communicated with the cold air chambers of the hot air furnaces through second cold air branch pipes, and one ends, close to the hot air furnaces, of the second cold air branch pipes are provided with pressure charging valves;
The grate is arranged in the cold air chamber, a beam is arranged at the bottom of the grate, the lower end of the beam is fixedly connected with a grate support column, the bottom of the grate support column is fixedly connected with a foundation pouring layer, a motor chamber is arranged at the bottom of the foundation pouring layer, a first linear motor and a second linear motor which are arranged in a staggered mode are arranged in the motor chamber, the first linear motor is fixedly connected with a first sliding rod, an output shaft of the second linear motor is fixedly connected with a second sliding rod, the first sliding rod penetrates through the foundation pouring layer and is fixedly connected with a first movable plate, the second sliding rod penetrates through the foundation pouring layer and is fixedly connected with a second movable plate, holes which are in sliding connection with the grate support column are formed in the first movable plate and the second movable plate, the first movable plate is positioned below the second movable plate, and holes which are in sliding connection with the second sliding rod are formed in the first movable plate, the first movable plate is provided with first vent holes which are uniformly arranged, the second movable plate is provided with second vent holes which are uniformly arranged, the first vent holes and the second vent holes are arranged in a staggered mode, and the bottom of the second movable plate is provided with a sliding column which is in sliding connection with the first vent holes and matched with the first vent holes.
2. The high-efficiency conversion device without fluctuation for the change of the hot blast stove according to claim 1, characterized in that: the first vent hole is in an inverted circular truncated cone shape, and the sliding column is in an inverted circular truncated cone shape matched with the first vent hole in shape.
3. The high-efficiency conversion device without fluctuation for the change of the hot blast stove according to claim 1, characterized in that: the top of the fire grate is provided with a lattice brick, the lattice brick is internally provided with brick lattice holes, and the brick lattice holes are communicated with the second vent hole holes and are on the same axis.
4. The high-efficiency conversion device without the fluctuation for the furnace change of the hot blast stove according to claim 3, characterized in that: the checker brick structure is a horizontal airflow channel and a longitudinal airflow channel which are connected by pores in the transverse direction.
5. The high-efficiency conversion device without the fluctuation for the furnace change of the hot blast stove according to claim 1, characterized in that: the number of the first vent holes and the number of the second vent holes are the same as that of the brick grid holes.
6. The high-efficiency conversion device without the fluctuation for the furnace change of the hot blast stove according to claim 3, characterized in that: the top of the cross beam is symmetrically provided with bulges, and the bulges are used for supporting the checker bricks and limiting the checker bricks.
7. A control method of a high-efficiency conversion device without fluctuation for a hot blast stove, which relates to the high-efficiency conversion device without fluctuation for a hot blast stove according to any one of claims 1 to 6, so as to realize the high-efficiency conversion device without fluctuation, and is characterized in that:
S1: pre-pressurizing a cold air chamber at the bottom of the hot blast stove;
s2: when a certain hot blast stove in a combustion state needs to transfer wind from combustion, a control system enables the cold air chamber to be communicated with the top space of the cold air chamber by controlling the motion of the first linear motor and the second linear motor, and the pre-charging gas in the cold air chamber pre-charges the top space of the cold air chamber of the hot blast stove;
s3, after pre-charging the top space of the cold air chamber of the hot air furnace by pre-charging gas in the cold air chamber, charging the cold air chamber of the hot air furnace in a combustion state through a pressure equalizing valve;
s4, in the process of pressurizing the cold air chamber, if a wind pressure sensor corresponding to the hot-blast stove which is blowing air detects that the wind pressure is lower than a preset value, starting the second cold air main pipe, and closing the first cold air main pipe to ensure that the wind pressure of the blowing air in the hot-blast stove which is blowing air is kept stable;
s5, the controller controls pre-pressurized gas in the cold air chambers of the other hot air furnaces in a combustion state to supplement pressure to the cold air chambers of the first cold air main pipe and the hot air furnaces in a combustion transfer air state, and simultaneously controls a pressure equalizing valve at the air inlet end of the first cold air main pipe to supplement pressure to the cold air chambers of the first cold air main pipe and the hot air furnaces in the combustion transfer air state;
S6, stopping pre-charging gas in the cold air chambers of the other hot air furnaces in the combustion state after pressure compensation is finished, performing pressure compensation on the first cold air main pipe and the cold air chambers of the hot air furnaces in the combustion transfer air state, closing the second cold air main pipe, and starting the first cold air main pipe;
s7, repeating the steps S2-S6; completing pressurizing of the hot blast stove for transferring and supplying air for combustion;
s8, after the pressurization is finished, a second cold air valve of the hot blast stove for combustion and air supply conversion is opened, so that the wave-free furnace change is realized;
s9, controlling the first linear motor and the second linear motor to start and drive the first movable plate and the second movable plate to move upwards to the top of the cold air chamber to form a closed space;
and S10, when the air supply hot blast stoves are in the air supply stage, pre-charging the cold air chamber at the bottom of the hot blast stove by controlling the pressure equalizing valve of the hot blast stove needing to be converted from air supply to combustion so as to prepare for the furnace change of the hot blast stove converting the subsequent combustion into air supply.
8. The control method of the high-efficiency conversion device without the fluctuation of the hot blast stove for changing the stove according to claim 7 comprises the following steps: it is characterized in that step S1 specifically includes: s11: before the whole hot blast stove equipment works, the controller starts the first linear motor and the second linear motor and drives the first movable disc and the second movable disc to move upwards together, so that the first movable disc, the second movable disc and the bottom of the hot blast stove form a sealed cold air chamber together;
S12: opening an air inlet valve of the second cold air main pipe, opening a second cold air valve, opening a pressure equalizing valve at a connection port of the first cold air main pipe and the air blower, and then starting the air blower to blow air so that the air blower pressurizes all cold air chambers in a constant air volume mode;
s13: and after the pre-pressurization of the cold air chamber is completed, closing the air inlet valve of the second cold air main pipe, closing the pressurization valve and closing the second cold air valve.
9. The control method of the high-efficiency conversion device without the fluctuation of the hot blast stove comprises the following steps: it is characterized in that step S5 specifically includes: s51: the controller controls a pressure charging valve of the hot blast stove in a combustion state to be opened, so that the gas in a cold air chamber of the hot blast stove in the combustion state supplies pressure to a first cold air main pipe and a first stove cold air chamber, and controls a pressure equalizing valve at the connecting port of the first cold air main pipe and the blower to equalize pressure, so that the pressure difference between the first cold air main pipe and a second cold air main pipe is reduced, the pressure equalizing valve at the connecting port of the first cold air main pipe and the blower is equalized, and the pressure fluctuation of the second cold air main pipe is reduced;
S52: work as when second cold blast house steward admission valve department wind pressure sensor detects the wind pressure and is less than the default, the pressure-equalizing valve of first cold blast house steward and air-blower connection port department closes and stops the voltage-sharing, the air-blower is adjusted in time, makes through the adjustment the interior atmospheric pressure of second cold blast house steward resumes to stable atmospheric pressure fast.
10. The control method of the high-efficiency conversion device without the fluctuation of the hot blast stove for changing the stove according to claim 7 comprises the following steps: the method is characterized in that the step S10 specifically comprises the following steps: s101: in the pre-pressurizing process, when a wind pressure sensor corresponding to the hot blast stove in an air supply state detects that the wind pressure is smaller than a preset value, the air blower is changed from constant wind volume to constant pressure air supply, meanwhile, a controller controls a second cold wind valve of the hot blast stove in the air supply state to be closed, controls a pressurizing valve in the air supply state to be opened and opened, and closes a pressure equalizing valve at a connection port of the first cold wind main pipe and the air blower, so that the first cold wind main pipe stops supplying air, and the second cold wind main pipe supplies air to the air supply state;
s102, when the wind pressure sensor at the air inlet valve of the second cold air main pipe detects that the wind pressure is larger than a preset value, controlling a pressure equalizing valve at the connecting port of the first cold air main pipe and the blower to be opened and supplementing pressure to the first cold air main pipe and a hot blast stove for combustion to supply air;
S103, after pressure compensation is completed, closing a pressure equalizing valve of the hot blast stove for combustion to supply air, simultaneously closing an air inlet valve of the second cold air main pipe, closing a pressure charging valve of the hot blast stove in an air supply state, simultaneously completely opening a pressure equalizing valve at the connection port of the first cold air main pipe and the air blower, and opening a second cold air valve of the hot blast stove in an air supply state, so that the first cold air main pipe bears air supply work, and the second cold air main pipe stops air supply work; and changing the constant pressure air supply of the blower into constant air volume air supply; thereby completing the pre-charging and preparing for the furnace changing of the hot blast stove for the subsequent combustion and air supply.
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| CN114774608B (en) * | 2022-05-11 | 2024-03-19 | 郑州豫兴热风炉科技有限公司 | Non-fluctuation furnace changing device of hot blast stove |
| CN115029493B (en) * | 2022-06-29 | 2023-05-12 | 马钢集团设计研究院有限责任公司 | Method for improving air temperature of blast furnace hot blast stove |
| CN115094178B (en) * | 2022-07-13 | 2024-02-09 | 中冶京诚工程技术有限公司 | Hot blast stove pressurizing mechanism, collaborative furnace changing system and pressure stabilizing furnace changing method |
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| US4343290A (en) * | 1981-02-26 | 1982-08-10 | Flatte James W | Hot air furnace |
| CN2806493Y (en) * | 2005-06-08 | 2006-08-16 | 甘树元 | Constant pressure stove changing device of blast furnace hot blast stove |
| CN105002322A (en) * | 2014-04-18 | 2015-10-28 | 宝钢不锈钢有限公司 | Pressure supplement apparatus and pressure compensation method for blast furnace hot blast stove exchange |
| CN104232823B (en) * | 2014-09-30 | 2016-04-20 | 江苏永钢集团有限公司 | Hotblast stove level pressure changes stove control method |
| CN105803146B (en) * | 2016-03-15 | 2018-01-23 | 王长春 | A kind of independent hot-blast stove pressurising method and pressurizing device |
| JP6954824B2 (en) * | 2017-12-18 | 2021-10-27 | 日鉄エンジニアリング株式会社 | Hot air furnace equipment and hot air furnace operation method |
| CN112760439B (en) * | 2019-11-01 | 2023-01-17 | 成都成发科能动力工程有限公司 | Undisturbed furnace change control method for hot blast furnace |
| CN111778374A (en) * | 2020-06-13 | 2020-10-16 | 安徽长江钢铁股份有限公司 | Automatic balancing method for changing pressure of hot blast stove |
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