CN114350867A - Blast furnace operation system and combustion fan switching method - Google Patents
Blast furnace operation system and combustion fan switching method Download PDFInfo
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- CN114350867A CN114350867A CN202210022377.1A CN202210022377A CN114350867A CN 114350867 A CN114350867 A CN 114350867A CN 202210022377 A CN202210022377 A CN 202210022377A CN 114350867 A CN114350867 A CN 114350867A
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Abstract
The embodiment of the invention discloses a blast furnace operation system and a combustion fan switching method, wherein the system device comprises a blast furnace, a hot blast stove, at least one combustion fan and a control device, wherein the hot blast stove is connected with the blast furnace through a hot blast stove pipeline and used for supplying hot air to the blast furnace; the at least one combustion-supporting fan is connected with a combustion-supporting air main pipe through an air supply branch, and the combustion-supporting air main pipe is connected with the hot blast stove and used for transmitting inlet air to the hot blast stove to be heated to a set temperature so as to form hot air; the control device is used for controlling the hot blast stove to be adjusted from the state of the hot blast stove to the stewing state through a valve arranged in a control pipeline before a new combustion-supporting fan replaces an old combustion-supporting fan and is connected to a combustion-supporting air main pipe through an air supply branch, and cutting off air supply through controlling an outlet cut-off valve arranged in the air supply branch to be closed. The embodiment of the invention utilizes the control device to carry out safe and reliable on-line switching on the combustion fan.
Description
Technical Field
The embodiment of the invention relates to the technology of blast furnace equipment, in particular to a blast furnace operation system and a switching method of a combustion fan.
Background
The combustion-supporting fan is an air source supply device which needs combustion-supporting air in the burning process of the hot blast stove, and is also a necessary device in the production of the blast furnace, two combustion-supporting fans are usually arranged, one combustion-supporting fan is used as a standby device, and the structural configuration of the combustion-supporting fan is completely the same. After the combustion-supporting fan is used for a long time, due to the reasons of equipment condition, performance and the like, the combustion-supporting fan needs to be replaced again in the process of hot blast stove system transformation.
In order not to influence the production of the blast furnace, under the condition that the site position is feasible, a new combustion-supporting fan is generally considered to be built, but in order to ensure the safe debugging and switching work of the combustion-supporting fan, the blast furnace is required to be stopped for 8-12 hours, and then the old combustion-supporting fan is withdrawn from the production. The blast furnace damping down directly leads to the blast furnace to stop production, influences the molten iron output, and other costs also rise, so hope can accomplish combustion fan's switching through not damping down to improve output saving cost.
Disclosure of Invention
The embodiment of the invention provides a blast furnace operation system and a combustion fan switching method, which are used for realizing safe and reliable online switching of combustion fans.
In a first aspect, an embodiment of the present invention provides a blast furnace operation system, including:
a blast furnace;
the hot blast stove is connected with the blast furnace through a hot blast stove pipeline and used for supplying hot blast to the blast furnace;
the combustion-supporting air main pipe is connected with the hot blast stove and used for transmitting inlet air to the hot blast stove to be heated to a set temperature so as to form hot air;
and the control device is used for controlling the hot blast stove through a valve arranged in a control pipeline before a new combustion-supporting fan replaces an old combustion-supporting fan and is connected to the combustion-supporting air main pipe through an air supply branch, so that the state of the hot blast stove is adjusted to a smoldering state, and the air supply is cut off by controlling an outlet cut-off valve arranged in the air supply branch to be closed.
In a second aspect, an embodiment of the present invention further provides a method for switching combustion fans in a blast furnace operation system, where the method includes:
loading a new combustion fan to be replaced and driving software of a corresponding valve and testing;
after the test is successful, controlling an air door regulating valve and an outlet cut-off valve of the new combustion fan to be closed;
switching a power cable and a signal cable in the blast furnace operation system to be connected with the new combustion-supporting fan so as to replace the old combustion-supporting fan;
controlling to close an outlet cut-off valve corresponding to the old combustion-supporting fan to be replaced; when the new combustion-supporting fan is connected to a combustion-supporting air main pipe through the air supply branch, controlling a corresponding outlet cut-off valve to be opened, and controlling the new combustion-supporting fan to start to operate;
and in the process of closing the outlet cut-off valve corresponding to the old combustion-supporting fan, controlling the hot blast stove to be adjusted from the hot blast stove state to the smoldering state by a valve arranged in a control pipeline.
According to the embodiment of the invention, the control device is connected with the combustion-supporting fan and the outlet stop valve on the air supply branch, and the opening and closing of the outlet stop valve of the air supply branch are controlled, so that the on-line switching of the combustion-supporting fan is realized; meanwhile, the working state of the braising furnace of the hot blast stove is controlled, the potential safety hazard problem existing in the online switching of the combustion-supporting fan is solved, and the safe and reliable online switching effect of the combustion-supporting fan is realized.
Drawings
FIG. 1 is a schematic structural diagram of a blast furnace operation system according to an embodiment of the present invention;
FIG. 2 is a schematic view showing the connection of hot blast stove pipes in a blast furnace operation system according to a second embodiment of the present invention;
FIG. 3 is a schematic structural view of a blast furnace operation system according to a third embodiment of the present invention;
fig. 4 is a flowchart of a method for switching combustion fans in a blast furnace operation system according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a schematic structural diagram of a blast furnace operation system according to an embodiment of the present invention, which can be applied to the modification of an actual blast furnace hot blast stove system, and includes: blast furnace 110, hot blast stove 210, at least one combustion fan and control device 410. In this embodiment, two combustion-supporting fans are taken as an example for description, and are a new combustion-supporting fan 310 and an old combustion-supporting fan 320 to be replaced respectively.
The hot blast stove 210 is connected with the blast furnace 110 through a hot blast stove pipeline and is used for supplying hot blast to the blast furnace 110; the combustion-supporting air main pipe is connected with the hot blast stove 210 and used for transmitting inlet air to the hot blast stove 210 and heating the inlet air to a set temperature to form hot air; and the control device 410 is used for controlling the hot blast stove 210 through a valve arranged in a control pipeline before the new combustion-supporting fan 310 is used for replacing the old combustion-supporting fan 320 and is connected to the combustion-supporting air main pipe through the air supply branch, so that the state of the hot blast stove 210 is adjusted to the smoldering state, and the air supply is cut off by controlling outlet cut-off valves 311 and 321 arranged in the air supply branch to be closed.
Specifically, the blast furnace is a metallurgical facility for extracting pig iron from iron ore in a high-temperature environment.
Hot blast stoves are thermodynamic devices that heat blast air to a desired temperature in a blast furnace action system to increase the efficiency and efficiency of the blast furnace. The heat storage type blast furnace works according to the heat storage principle, heat is provided when coal gas is combusted, heat is stored through the insulating bricks in the furnace, and the hot blast furnace supplies air for the blast furnace when the required temperature is reached. When three hot blast stoves are installed, two hot stoves are used for heating and one air supply, or four hot blast stoves are used for heating and two air supplies. The number of hot blast stoves is not limited in this embodiment. Meanwhile, the hot blast stove has different types such as internal combustion type, external combustion type and top combustion type, and the type of the hot blast stove is not limited in the embodiment.
The combustion-supporting fan is a device for providing a combustion-supporting air source in the burning process of the hot blast stove and is also a necessary device in the production of the blast furnace. The combustion-supporting air is air which is not dangerous per se, but is closely related to the actual production safety of a blast furnace operation system. Taking a new combustion-supporting fan in a blast furnace operation system as an example, the combustion-supporting fan 310 is connected with an air supply branch, a combustion-supporting air main pipe is connected between the air supply branch and the hot blast stove 210, and air generated by the combustion-supporting fan 310 is transmitted into the hot blast stove 210 through the air supply branch and the combustion-supporting air main pipe. The combustion fan of the hot blast stove generally adopts a centrifugal blower and adopts independent air blowing or centralized air blowing. The present embodiment does not limit the type of the combustion fan.
The control device is a Programmable Logic Controller (PLC), and a user can edit a corresponding user program according to the user's needs to meet different automatic production requirements. The PLCs may be classified according to structural form, control scale and implementation function. The control device is connected with the new combustion fan 310 and the old combustion fan 320, and the online switching of the combustion fans can be realized through the control device 410. The valve arranged in the connecting pipeline with the hot blast stove 210 is controlled, so that different working states of the hot blast stove can be adjusted. When the combustion-supporting fan is switched on line, the control device is prevented from being operated by mistake to influence the unexpected working state generated by the hot blast stove, so that the hot blast stove is adjusted to the braising state by controlling the arranged valve, but the air supply to the blast furnace is not stopped, and the safety measure for realizing the on-line switching of the combustion-supporting fan is taken. The cut-off valve is one of the executing mechanisms in the automatic system and consists of a multi-spring pneumatic membrane executing mechanism or a floating type piston executing mechanism and a regulating valve. The shut-off valve controls the cut-off, connection or switching of the fluid in the process pipe. The device has the characteristics of simple structure, sensitive response, reliable action and the like. Can be widely applied to industrial production departments such as petroleum, chemical industry, metallurgy and the like. In a blast furnace operation system, taking a new combustion fan as an example, a control device 410 is connected with a combustion fan 310 and an outlet shut-off valve 311 on a combustion fan air supply branch, and a user can control the outlet shut-off valve 311 through the control device 410 according to the actual requirements of the operation system. When new and old combustion-supporting fan passes through air supply branch road and connects combustion-supporting house steward, controlling means 410 is to opening and closing of corresponding export trip valve 311 and 321, guarantees under the suitable circumstances of intraductal pressure, further can add the blind plate on combustion-supporting fan air supply branch road pipeline, carries out combustion-supporting fan's switching through taking out stifled blind plate, has improved the fail safe nature of switching work, and this embodiment does not restrict the kind of controlling means and export trip valve.
According to the technical scheme of the embodiment, the control device in the blast furnace operation system controls the outlet cut-off valve on the air supply branch, so that the connection or disconnection between the air supply branch and the combustion-supporting main pipe corresponding to the new and old combustion-supporting fans can be realized, the state of the hot blast stove is controlled and adjusted to the stewing state, the safety of the online switching of the combustion-supporting fans is ensured, and the safe and reliable online switching debugging effect of the combustion-supporting fans in the blast furnace operation system is achieved.
Example two
Fig. 2 is a schematic diagram of the connection of hot blast stove pipes in a blast furnace operation system according to a second embodiment of the present invention, which is further detailed based on the first embodiment. The blast furnace operation system further comprises:
optionally, a gas pipeline 211 connected to the hot blast stove 210 for feeding gas, a hot blast pipeline 212 connected between the hot blast stove 210 and the blast furnace 110 for feeding hot blast to the blast furnace 110, a cold blast pipeline 213 connected to the hot blast stove 210 for feeding cold blast, a waste gas pipeline 214 connected to the hot blast stove 210 for discharging waste gas, and a combustion-supporting main 215 connected to an air supply branch of a combustion-supporting fan;
the valve in the hot blast stove pipeline comprises:
a gas combustion valve 211A and a gas shut-off valve 211B which are arranged in the gas pipeline 211, a hot blast valve 212A which is arranged in the hot blast pipeline 212, a cold blast valve 213A which is arranged in the cold blast pipeline 213 and a flue valve 214A which is arranged in the waste gas pipeline 214;
correspondingly, the control device is specifically used for controlling the working state of the hot blast stove by controlling the gas combustion valve 211A, the gas cut-off valve 211B, the hot blast valve 212A, the cold blast valve 213A and the flue valve 214A.
Optionally, the number of the hot blast stoves is three;
the control device is specifically used for controlling two hot blast stoves to be in a smoldering state and controlling one hot blast stove to be in an air supply state before a new combustion-supporting fan replaces an old combustion-supporting fan and is connected to a combustion-supporting air main pipe through an air supply branch;
the control device is specifically used for controlling the two hot blast stoves to be in a furnace burning state and controlling one hot blast stove to be in an air supply state before the new combustion-supporting fan is connected to the combustion-supporting air main pipe through the air supply branch and after the new combustion-supporting fan is connected to the combustion-supporting air main pipe through the air supply branch.
Specifically, the pipelines connected to the hot blast stove 210 are respectively a gas pipe 211, a hot blast pipe 212, a cold blast pipe 213, a flue pipe 214, and a combustion air main 215. The gas pipeline has the function of providing heat for the hot air furnace through the combustion of gas, and the gas pipeline 211 is provided with a gas combustion valve 211A and a gas stop valve 211B which are used for controlling the combustion of the gas and the on-off of the input of the gas. The function of the hot air duct 212 is to convey and distribute the generated hot air from the hot blast stove to the blast furnace for blast furnace production. And the hot air duct is required to have good sealing performance and less heat loss, and is provided with a hot air valve 212A for controlling the circulation of hot air in the duct. The effect of cold air duct 213 is to let in cold air to the hot-blast stove through the air-cooler for adjust the interior heat supply temperature of stove, and cold air valve 213A sets up on the cold air duct, the circulation of the intraductal cold wind of control. The flue pipe 214 has a flue valve 214A for discharging exhaust gas generated by heat generation. The combustion air manifold 215 is used for supplying combustion air provided by the combustion fan to the hot blast stove for providing energy for combustion of related gas in the stove.
The hot blast stove has three working states, when the hot blast stove 210 is in a combustion state, the gas combustion valve 212A and the gas cut-off valve 212B are communicated through the gas pipeline 211, gas is fed into the hot blast stove 210, a proper amount of combustion-supporting air fuel is fed into the hot blast stove 210 through the combustion-supporting air main pipe 215 for combustion, heat is generated to heat and accumulate the temperature of the hot blast stove 210, meanwhile, the cold air valve 213A and the hot air valve 212A are communicated, cold air is introduced into the pipe to adjust the heat supply temperature in the stove, hot air is transmitted to the blast furnace 110, and the flue valve 214A is communicated to discharge waste gas generated in the pipe; when the temperature in the hot blast stove 210 is heated to the heat storage temperature, valves such as a cold air valve 213A, a hot air valve 212A, a gas combustion valve 211A, a gas cut-off valve 211B, a flue valve 214A and the like on corresponding pipelines are closed, and the hot blast stove 210 is in a smoldering state; except that the cold air valve 213A and the hot air valve 212A on the corresponding pipeline are in an open state, when other valves are in a closed state, the hot air furnace 210 is in an air supply working state. The air supply state is that cold air is supplied to the heated hot blast stove 210 through the cold air valve 213A, and the heated hot air is supplied to the blast furnace through the hot air valve 212A, at this time, the blast furnace 110 is not stopped. In order to prevent the unexpected working state of the hot blast stove caused by misoperation of the control device when the combustion-supporting fan switches on line to control the on-off of the outlet stop valves on the combustion-supporting fan and the air supply branch, for example, a central processing unit needs to be stopped when the control device downloads a program, and the gas overpressure in the hot blast stove caused by misoperation possibly occurring when the control device restarts. Therefore, the working state of the hot blast furnaces is adjusted in advance in the blast furnace operation system, when the new combustion-supporting fan and the old combustion-supporting fan are switched, the two hot blast furnaces are controlled to be in a smoldering state through the valve on the pipeline, one hot blast furnace is in an air supply state, and the hot blast furnaces stop burning for about 40-60 minutes. Meanwhile, air from the combustion fan is not preheated, the temperature is reduced by about 30-35 ℃, the pressure is reduced by less than or equal to 10 kilopascals, and the method is completely feasible in production. The process has no influence on damping down of the blast furnace and no potential safety hazard. Before the new combustion-supporting fan is connected to the combustion-supporting air main pipe through the air supply branch and after the new combustion-supporting fan is connected to the combustion-supporting air main pipe through the air supply branch, the two hot blast stoves are controlled to be in a combustion state through a valve on a pipeline, one hot blast stove is in an air supply state, and the normal production process is recovered. The potential safety hazard which may be generated is not limited by the embodiment.
According to the technical scheme, through the control of the valve on the hot blast stove pipeline, the hot blast stove realizes the working state of air supply and combustion and the working state of air supply and smoldering furnace, potential safety hazards which possibly exist when the combustion-supporting fan is switched are solved, the safety requirement of online switching of the combustion-supporting fan is met, meanwhile, the blast furnace is prevented from damping down, and the yield of the blast furnace is not influenced.
EXAMPLE III
Fig. 3 is a schematic view of a blast furnace operation system according to a third embodiment of the present invention, which is further detailed based on the first embodiment. The blast furnace operation system further comprises:
optionally, a bleeding valve 330 disposed in the combustion air manifold;
correspondingly, the control device is also used for controlling the relief valve to be opened when the pressure in the combustion air main pipe is detected to exceed the set pressure value, so as to reduce the pressure in the combustion air main pipe.
Optionally, damper valves 312 and 323 are disposed at air inlets of the combustion fans 310 and 320;
correspondingly, the control device is also used for controlling the air door regulating valves 313 and 323 so as to adjust the air supply quantity of the combustion fan.
Optionally, the air preheaters 510 are respectively disposed in the combustion air main for preheating the air supplied by the combustion air blowers 310 and 320;
an air inlet valve 511, which is arranged at the air inlet of the air preheater 510;
and a bypass valve 520 provided on a bypass pipe of the combustion air manifold, for opening when the air inlet valve 511 cannot be normally used.
Optionally, the human-computer interaction device 610 interacts with the control device through a short-distance or long-distance communication technology, and is configured to obtain and display a control entry of a control component in the control device 410, receive a control instruction input by a user through the control entry, and transmit the control instruction to the control device 410 for execution;
the control assembly comprises valves and a combustion fan in the pipeline, and the control device realizes the analysis and execution of the control instruction by loading the driving software of the control assembly.
Specifically, the relief valve is a safety early warning device for pipeline transportation of combustible gas, and when the pressure of a control point exceeds a set value due to a temporary reason, the valve for discharging a certain amount of gas adjusts the pressure in the pipe. The bleeding valves can be classified according to the types of the valves, the small caliber generally adopts a throttling spherical valve, and the large caliber generally adopts a throttling butterfly valve. In the blast furnace operation system, the blow-off valve detects the pressure in the pipe on the air supply branch, and when the pressure in the pipe exceeds the safety pressure value set in the pipe, the blow-off valve is opened to reduce the pressure in the pipe. The bleeding valve has the effect of safety warning, and the type of the bleeding valve is not limited in the embodiment.
The regulating valve is a final control element for changing the process parameters of medium flow, pressure, temperature, liquid level and the like by receiving a control signal output by a controller in the field of industrial automation process control. If according to the stroke characteristic, the regulating valve can be divided into a straight stroke and an angular stroke; it can be divided into a pneumatic regulating valve, an electric regulating valve and a hydraulic regulating valve according to the power used by the matched executing mechanism. And an air door regulating valve at the air inlet of the combustion-supporting fan is installed to regulate the air supply quantity of the combustion-supporting fan, so that the demand of a blast furnace operation system is met. The present embodiment does not limit the type of the damper valve.
The air preheater is a device for improving the heat exchange performance of the hot blast stove and reducing the energy consumption. The air supply device is arranged on the air supply branch road, and an air source provided by the combustion fan is preheated, so that the hot air transmission efficiency of the whole blast furnace operation system is improved. An air inlet valve is arranged at an air inlet of the air preheater, and when the air inlet valve cannot be normally opened, a bypass valve on a bypass pipeline arranged on the air supply branch is opened as a standby valve to keep normal operation, so that the hot air transmission efficiency of the blast furnace operation system is improved. The air preheater is generally divided into three types, i.e., a plate type, a rotary type and a heat pipe type, and the type of the air preheater is not limited in this embodiment.
Human-Computer Interaction (HCI) is information exchange between a person and a Computer, and mainly comprises two parts of information exchange from the person to the Computer and from the Computer to the person. Human-computer Interaction is realized through a Human-computer Interaction interface (HMI), also called a user interface or a user interface, which is a medium for short-distance or long-distance information exchange between a system and a user, realizes connection between a control instruction input by the user and the control device, and has the Human-computer interface in the field of Human-computer information exchange. The control assembly is equipment controlled by the control device, a control inlet of the control assembly is displayed through an HMI interface, and a user inputs a related control instruction of the control assembly according to the control HMI and transmits the control instruction to the control device to execute the control of the control assembly. In the blast furnace action system, the man-machine interaction device 610 is connected with the driving software of the control component through the control device 410, such as: and each valve and the combustion-supporting fan in the pipeline analyze and execute the control instruction through a man-machine interaction interface by loading the driving software of the control assembly in the control device. And the online switching of a combustion-supporting fan and each valve in the blast furnace operation system is realized by utilizing a human-computer interaction device and a control device.
According to the technical scheme, the blow-off valve, the air door adjusting valve, the air preheater and the human-computer interaction device are additionally arranged in the blast furnace operation system, so that the safety coefficient of the whole blast furnace operation system is increased, the working efficiency is improved, the close-range and remote human-computer interaction is realized, and the blast furnace operation system is better adapted to the online switching and debugging work of the combustion fan.
Example four
Fig. 4 is a flowchart of a method for switching combustion fans in a blast furnace operation system according to a fourth embodiment of the present invention, where the method can be implemented by a control device in the blast furnace operation system according to the fourth embodiment of the present invention. The blast furnace action system control method is implemented by adopting the control device in the blast furnace operation system in any one of the above embodiments, wherein the method comprises the following steps:
s410, loading a new combustion-supporting fan to be replaced and driving software of a corresponding valve and testing;
wherein, the corresponding valve refers to the air door regulating valve and the outlet cut-off valve which correspond to the new combustion fan to be replaced. And when the combustion-supporting fan waiting for replacement needs to realize online switching, the driving software of the relevant valve needs to be downloaded in the control device. And when the drive software of the corresponding valve of the combustion fan in the control device is detected to be downloaded completely and the test control device can control the combustion fan and the corresponding valve, the test is finished.
Optionally, loading driving software of an air door regulating valve corresponding to a new combustion fan to be replaced, displaying a control inlet of the air door regulating valve through a human-computer interaction device, receiving a control instruction input by a user through the control inlet, and controlling the air door regulating valve to act according to the control instruction;
loading driving software of an outlet cut-off valve corresponding to a new combustion fan to be replaced, displaying a control inlet of the outlet cut-off valve through a man-machine interaction device, receiving a control instruction input by a user through the control inlet, and controlling the outlet cut-off valve to act according to the control instruction.
The control device can be used for online controlling the valve corresponding to the combustion-supporting fan, displaying a control inlet of the valve through the man-machine interaction device, realizing interaction between a user and the combustion-supporting fan and the corresponding valve, receiving a control instruction set in the man-machine interaction device by the user, and controlling the combustion-supporting fan and the corresponding valve according to the instruction by the control device. And the on-line control of the corresponding valve is realized by using the control device and the connected human-computer interaction device.
S420, after the test is successful, controlling an air door regulating valve and an outlet cut-off valve of the new combustion fan to be closed;
and after the downloading of the related driving software in the control device is finished, successfully realizing the control of the combustion-supporting fan and the corresponding valve through the man-machine interaction interface, namely, successfully testing. At the moment, the old combustion-supporting fan in the blast furnace operation system is put into use, and the new combustion-supporting fan is not put into use. And when the test is successful, the air door regulating valve and the outlet stop valve of the new combustion-supporting fan are controlled to be closed, so that the normal work of the blast furnace operation system before the new combustion-supporting fan is switched over is not influenced. And closing an air door regulating valve and an outlet stop valve of the new combustion-supporting fan, wherein the new combustion-supporting fan is in a state of waiting for being put into the blast furnace operation system formally.
S430, switching a power cable and a signal cable in the blast furnace operation system to connect the new combustion-supporting fan so as to replace the old combustion-supporting fan;
the power cable is a cable for transmitting electric power to equipment; the signal cable is a cable for transmitting a device control signal. When the new combustion-supporting fan is connected with the control device through the power cable and the signal cable, the control device can provide electric energy and control signals for the new combustion-supporting fan and the corresponding valve. When the combustion-supporting fan is switched on line, the power cable and the signal cable of the old combustion-supporting fan connected with the control device are switched to the power cable and the signal cable of the new combustion-supporting fan.
Optionally, when the new combustion fan and the valve are confirmed to operate normally, backup driving software in the control device, and switch a power cable and a signal cable in the blast furnace operation system to connect the old combustion fan to replace the new combustion fan;
triggering and executing the switching operation of another new combustion-supporting fan.
Wherein, combustion-supporting fan is when putting into operation, is equipped with two usually, and one is normally used, and one is used standby equipment. Except that a new combustion-supporting fan and a corresponding valve which are put into use are tested, the standby equipment also needs to carry out the same test process, so that a power cable and a signal cable in a blast furnace operation system are switched to be connected with the old combustion-supporting fan, the test process of the standby combustion-supporting fan is triggered, and the test processes are the same.
S440, controlling to close an outlet cut-off valve corresponding to the old combustion-supporting fan to be replaced; when the new combustion-supporting fan is connected to a combustion-supporting air main pipe through the air supply branch, controlling a corresponding outlet cut-off valve to be opened, and controlling the new combustion-supporting fan to start to operate;
the control device controls an outlet cut-off valve corresponding to the old combustion-supporting fan to be closed, and when the control device controls the air source on the air supply branch road to be cut off, the old combustion-supporting fan is withdrawn from the blast furnace operation system through the blind plugging plate. The control device controls an outlet cut-off valve corresponding to the new combustion-supporting fan to be opened, an air supply branch connected with the combustion-supporting fan is connected with a combustion-supporting air main pipe, a blind plate is drawn to formally connect the new combustion-supporting fan to a blast furnace operation system, the operation is started, and the online switching of the combustion-supporting fan is realized.
S450, in the process of closing an outlet cut-off valve corresponding to the old combustion-supporting fan, the hot blast stove is controlled to be adjusted from the hot blast stove state to the smoldering state through a valve arranged in a control pipeline.
Wherein, the valve on the hot blast stove connecting pipeline is controlled to adjust the working state of the hot blast stove. And in the switching process of the combustion-supporting fan, the combustion state in the working state of the hot blast stove is adjusted to be in a smoldering state, but the working state of the hot blast stove in an air supply state is kept unchanged. The working state of the hot air furnace tube is controlled in advance, so that the phenomenon that the hot air furnace generates an unexpected working state due to misoperation of related valves of the hot air furnace when a combustion fan is switched is avoided, and potential safety hazards exist in the switching process.
According to the technical scheme of the embodiment, after the new combustion-supporting fan and the driving software corresponding to the valve are loaded and the test is successful, the power cable and the signal cable of the control device are connected with the new combustion-supporting fan, the outlet stop valve of the old combustion-supporting fan is closed, the old combustion-supporting fan exits from the action system, the outlet stop valve of the new combustion-supporting fan is opened, the new combustion-supporting fan is put into use, and meanwhile, the working state that the hot blast stove is not heated is controlled, so that the problems that the combustion-supporting fan is switched on line by using the control device and the blast furnace is not shut down are solved, and the effect of safely and reliably switching the combustion-supporting fan on line by using the blast furnace operation system is achieved.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A blast furnace operation system, comprising:
a blast furnace;
the hot blast stove is connected with the blast furnace through a hot blast stove pipeline and used for supplying hot blast to the blast furnace;
the combustion-supporting air main pipe is connected with the hot blast stove and used for transmitting inlet air to the hot blast stove to be heated to a set temperature so as to form hot air;
and the control device is used for controlling the hot blast stove through a valve arranged in a control pipeline before a new combustion-supporting fan replaces an old combustion-supporting fan and is connected to the combustion-supporting air main pipe through an air supply branch, so that the state of the hot blast stove is adjusted to a smoldering state, and the air supply is cut off by controlling an outlet cut-off valve arranged in the air supply branch to be closed.
2. The system of claim 1, wherein:
the pipeline of the hot blast stove comprises:
the system comprises a gas pipeline connected with the hot blast stove and used for feeding gas, a hot air pipeline connected between the hot blast stove and the blast furnace and used for feeding hot air to the blast furnace, a cold air pipeline connected with the hot blast stove and used for feeding cold air, a waste gas pipeline connected with the hot blast stove and used for discharging waste gas, and a combustion-supporting main pipe connected with an air supply branch of a combustion-supporting fan;
the valve in the hot blast stove pipeline comprises:
the gas combustion valve and the gas shut-off valve are arranged in the gas pipeline, the hot blast valve is arranged in the hot blast pipeline, the cold blast valve is arranged in the cold blast pipeline, and the flue valve is arranged in the waste gas pipeline;
correspondingly, the control device is specifically used for controlling the working state of the hot blast stove by controlling the gas combustion valve, the gas stop valve, the hot blast valve, the cold blast valve and the flue valve.
3. The system according to claim 1 or 2, characterized in that:
the number of the hot blast stoves is three;
the control device is specifically used for controlling two hot blast stoves to be in a smoldering state and controlling one hot blast stove to be in an air supply state before a new combustion-supporting fan replaces an old combustion-supporting fan and is connected to a combustion-supporting air main pipe through an air supply branch;
the control device is specifically used for controlling the two hot blast stoves to be in a furnace burning state and controlling one hot blast stove to be in an air supply state before the new combustion-supporting fan is connected to the combustion-supporting air main pipe through the air supply branch and after the new combustion-supporting fan is connected to the combustion-supporting air main pipe through the air supply branch.
4. The system of claim 1, further comprising:
the bleeding valve is arranged in the combustion air main pipe;
correspondingly, the control device is also used for controlling the relief valve to be opened when the pressure in the combustion air main pipe is detected to exceed the set pressure value, so as to reduce the pressure in the combustion air main pipe.
5. The system of claim 1, further comprising:
the air door regulating valve is arranged at an air inlet of the combustion fan;
correspondingly, the control device is also used for controlling the air door regulating valve so as to adjust the air supply quantity of the combustion fan.
6. The system of claim 1, further comprising:
the air preheaters are respectively arranged in the combustion air main pipes and are used for preheating the air supply of the combustion fan;
the air inlet valve is arranged at the air inlet of each air preheater;
and the bypass valve is arranged on a bypass pipeline of the combustion air main pipe and is used for being opened when the air inlet valve cannot be normally used.
7. The system of claim 1, further comprising:
the human-computer interaction device is interacted with the control device through a short-distance or long-distance communication technology, is used for acquiring and displaying a control inlet of a control assembly in the control device, receives a control instruction input by a user through the control inlet and transmits the control instruction to the control device for execution;
the control assembly comprises valves and a combustion fan in the pipeline, and the control device realizes the analysis and execution of the control instruction by loading the driving software of the control assembly.
8. A method for switching combustion fan in a blast furnace operation system, which is performed by using the control device in the blast furnace operation system according to any one of claims 1 to 7, the method comprising:
loading a new combustion fan to be replaced and driving software of a corresponding valve and testing;
after the test is successful, controlling an air door regulating valve and an outlet cut-off valve of the new combustion fan to be closed;
switching a power cable and a signal cable in the blast furnace operation system to be connected with the new combustion-supporting fan so as to replace the old combustion-supporting fan;
controlling to close an outlet cut-off valve corresponding to the old combustion-supporting fan to be replaced; when the new combustion-supporting fan is connected to a combustion-supporting air main pipe through the air supply branch, controlling a corresponding outlet cut-off valve to be opened, and controlling the new combustion-supporting fan to start to operate;
and in the process of closing the outlet cut-off valve corresponding to the old combustion-supporting fan, controlling the hot blast stove to be adjusted from the hot blast stove state to the smoldering state by a valve arranged in a control pipeline.
9. The method of claim 8, wherein loading and testing driver software for a new combustion fan and corresponding valve to be replaced comprises:
loading driving software of an air door regulating valve corresponding to a new combustion fan to be replaced, displaying a control inlet of the air door regulating valve through a human-computer interaction device, receiving a control instruction input by a user through the control inlet, and controlling the action of the air door regulating valve according to the control instruction;
loading driving software of an outlet cut-off valve corresponding to a new combustion fan to be replaced, displaying a control inlet of the outlet cut-off valve through a man-machine interaction device, receiving a control instruction input by a user through the control inlet, and controlling the outlet cut-off valve to act according to the control instruction.
10. The method of claim 8, further comprising:
when the new combustion-supporting fan and the valve are confirmed to operate normally, backup driving software in the control device, and switch a power cable and a signal cable in the blast furnace operation system to be connected with the old combustion-supporting fan so as to replace the new combustion-supporting fan;
triggering and executing the switching operation of another new combustion-supporting fan.
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| CN202210022377.1A CN114350867A (en) | 2022-01-10 | 2022-01-10 | Blast furnace operation system and combustion fan switching method |
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| CN202210022377.1A CN114350867A (en) | 2022-01-10 | 2022-01-10 | Blast furnace operation system and combustion fan switching method |
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