Heat preservation method, device and equipment for hearth after blowing out of blast furnace and medium

Abstract

The invention discloses a heat preservation method, device and equipment for a hearth after furnace shutdown and a medium, and belongs to the technical field of metallurgy. The method comprises the following steps: after the blast furnace is shut down, obtaining the thermal load and the carbon brick temperature of a hearth, and spraying a preset mass of a heat preservation agent into the hearth; according to the thermal load and the carbon brick temperature, the minimum cooling water amount of the cooling wall is determined, cooling water with the minimum cooling water amount is input into the cooling wall, and the minimum cooling water amount is smaller than the cooling water amount input into the cooling wall when the blast furnace is opened. According to the method, a heat preservation agent is adopted for conducting physical heat insulation on the hearth, heat loss caused by air flow to the hearth is reduced, meanwhile, under the condition that carbon bricks of the hearth are protected, the cooling water amount of a cooling wall is lowered as much as possible, heat of slag taken away by cooling water is reduced, and the heat loss of the hearth is reduced in two modes; the amount of coke additionally supplemented due to heat loss of the hearth during next blow-in of the blast furnace is reduced, and slag iron stored in the hearth can be conveniently discharged after blow-in, so that the blast furnace is quickly recovered.

Description

Technical Field

[0001] The present invention relates to the field of metallurgical technology, and in particular, to a method, device, equipment and medium for insulating a hearth after a blast furnace is shut down. Background Art

[0002] Blast furnace shutdown with empty stock line is a common technical measure taken for long-term blast furnace outage. Before shutdown, the stock line is lowered to the tuyere zone, and after shutdown, construction can be carried out on the cooling stave area.

[0003] In the prior art, without treating the hearth carbon bricks, generally, the measure of not discharging the hearth residual iron is taken to greatly shorten the construction period of the blast furnace.

[0004] However, the temperature of the slag and iron stored in the hearth continuously decreases with the prolongation of the shutdown time, and even solidification may occur. After the blast furnace is restarted, more coke must be added to supplement the heat of the hearth. After the heat of the slag and iron is increased, it can be discharged from the iron notch. Therefore, the restart of the blast furnace becomes more and more difficult with the prolongation of the shutdown time. Based on this, how to provide a method for insulating the hearth so that the slag and iron do not cool down too fast is a technical problem to be solved urgently at present. Summary of the Invention

[0005] In view of the above problems, the present invention is proposed to provide a method, device, equipment and medium for insulating a hearth after a blast furnace is shut down, which can spray an insulating agent into the hearth after the blast furnace is shut down, use physical heat insulation to insulate the hearth, and at the same time, while protecting the carbon bricks from being damaged by high temperature, reduce the cooling water volume of the cooling staves as much as possible, reduce the heat of the slag taken away by the cooling water, so that the slag and iron do not cool down too fast. By these two methods, the heat loss of the hearth is reduced, the amount of coke additionally supplemented due to the heat loss of the hearth during the next restart of the blast furnace can be reduced, and it is beneficial to discharge the slag and iron stored in the hearth after restart, so that the blast furnace can be quickly restored.

[0006] In a first aspect, the present invention provides a method for insulating a hearth after a blast furnace is shut down, the blast furnace including a hearth and cooling staves, the method comprising:

[0007] After the blast furnace is shut down, obtain the heat load of the hearth and the temperature of the carbon bricks, and spray a preset mass of insulating agent into the hearth;

[0008] Determine the minimum cooling water volume of the cooling staves according to at least one of the heat load and the carbon brick temperature, and input cooling water with the minimum cooling water volume to the cooling staves;

[0009] Wherein, the minimum cooling water volume is less than the standard cooling water volume, and the standard cooling water volume is the cooling water volume input into the cooling staves when the blast furnace is restarted.

[0010] Optionally, determining the minimum cooling water volume of the cooling stave according to at least one of the heat load and the carbon brick temperature includes:

[0011] If the heat load is less than a preset first heat load threshold and greater than a preset second heat load threshold, then determine that the minimum cooling water volume of the cooling stave is a preset first cooling water volume; wherein, the first heat load threshold is greater than the second heat load threshold;

[0012] If the heat load is less than or equal to the second heat load threshold and the carbon brick temperature is greater than a preset temperature threshold, then determine that the minimum cooling water volume of the cooling stave is the first cooling water volume;

[0013] If the heat load is less than or equal to the second heat load threshold and the carbon brick temperature is less than or equal to the temperature threshold, then determine that the minimum cooling water volume of the cooling stave is a preset second cooling water volume;

[0014] Wherein, the first cooling water volume is greater than the second cooling water volume.

[0015] Optionally, determining the minimum cooling water volume of the cooling stave according to at least one of the heat load and the carbon brick temperature includes:

[0016] Obtain the time difference between the current moment and the planned air supply moment of the blast furnace to obtain a target duration, where the planned air supply moment is the air supply moment before the next start-up of the blast furnace;

[0017] Determine the minimum cooling water volume of the cooling stave according to at least one of the heat load, the carbon brick temperature, and the target duration.

[0018] Optionally, determining the minimum cooling water volume of the cooling stave according to at least one of the heat load, the carbon brick temperature, and the target duration includes:

[0019] If the heat load is less than a preset first heat load threshold and greater than a preset second heat load threshold, or if the target duration is less than a preset duration threshold, then determine that the minimum cooling water volume of the cooling stave is a preset first cooling water volume;

[0020] If the heat load is less than or equal to the second heat load threshold and the carbon brick temperature is greater than a preset temperature threshold, then determine that the minimum cooling water volume of the cooling stave is the first cooling water volume;

[0021] If the heat load is less than or equal to the second heat load threshold, the carbon brick temperature is less than or equal to the temperature threshold, and the target duration is greater than or equal to the duration threshold, then determine that the minimum cooling water volume of the cooling stave is a preset second cooling water volume;

[0022] Wherein, the amount of the first cooling water is greater than the amount of the second cooling water.

[0023] Optionally, after spraying a preset mass of heat-insulating agent into the hearth, the method further includes:

[0024] Obtaining the gas concentration in the blast furnace;

[0025] If the gas concentration is greater than a preset concentration threshold, spraying the heat-insulating agent into the hearth again.

[0026] Optionally, the amount of the second cooling water is 0.

[0027] Optionally, before spraying a preset mass of heat-insulating agent into the hearth, the method further includes:

[0028] Obtaining the bulk density of the heat-insulating agent, the radius of the hearth, and a preset spraying thickness;

[0029] Determining a preset mass according to the bulk density, the radius, and the spraying thickness.

[0030] In a second aspect, the present invention provides a heat-insulating device for a hearth after a blast furnace is shut down. The blast furnace includes a hearth and a cooling stave. The device includes:

[0031] A spraying module, configured to obtain the heat load of the hearth and the carbon brick temperature after the blast furnace is shut down, and spray a preset mass of heat-insulating agent into the hearth;

[0032] A cooling module, configured to determine the minimum cooling water amount of the cooling stave according to at least one of the heat load and the carbon brick temperature, and input cooling water with the minimum cooling water amount to the cooling stave;

[0033] Wherein, the minimum cooling water amount is less than the standard cooling water amount, and the standard cooling water amount is the cooling water amount input into the cooling stave when the blast furnace is started up.

[0034] In a third aspect, the present invention provides an electronic device, including: a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to execute the method as described in the first aspect.

[0035] In a fourth aspect, the present invention provides a computer-readable storage medium, which stores computer instructions for causing a computer to execute the method as described in the first aspect.

[0036] The technical solutions provided in the embodiments of the present invention at least have the following technical effects or advantages:

[0037] A method, device, equipment and medium for insulating the hearth after a furnace shutdown provided by an embodiment of the present invention. After the blast furnace is shut down, the heat load of the hearth and the carbon brick temperature are obtained, and a preset mass of heat-insulating agent is sprayed into the hearth to insulate the hearth by this physical heat-insulating method of the heat-insulating agent; according to at least one of the heat load and the carbon brick temperature, the minimum cooling water volume of the cooling stave is determined, and cooling water with the minimum cooling water volume is input into the cooling stave. The minimum cooling water volume is less than the standard cooling water volume, and the standard cooling water volume is the cooling water volume input into the cooling stave when the blast furnace is started up. While ensuring that the heat load of the hearth and the carbon brick temperature will not be too low, the cooling water volume of the cooling stave is adjusted as low as possible to reduce the heat of the slag taken away by the cooling water, so that the slag iron will not cool down too fast. This method reduces the heat loss of the hearth in two ways, can reduce the amount of coke additionally supplemented due to the heat loss of the hearth when the blast furnace is started up next time, and is beneficial to discharging the slag iron stored in the hearth after the start-up, so that the blast furnace can be quickly restored.

[0038] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the following specifically gives the specific implementation manners of the present invention. Description of the Drawings

[0039] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. And throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0040] Figure 1 is a flowchart of a method for insulating the hearth after a blast furnace shutdown provided by an embodiment of the present application;

[0041] Figure 2 is a schematic diagram of the tuyere layout structure provided by an embodiment of the present application;

[0042] Figure 3 is a structural block diagram of a device for insulating the hearth after a blast furnace shutdown provided by an embodiment of the present application. Detailed Embodiments

[0043] To make the purpose, technical solution and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the drawings. It should be understood that the embodiments of the present disclosure and the specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations on the technical solution of the present application. Without conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0044] In the embodiment of the present application, the blast furnace includes a hearth and a cooling stave. The hearth is used to provide areas for fuel combustion, slag-iron reaction, and slag-iron storage and discharge. The cooling stave is used to cool the inner wall of the blast furnace through cooling water. When the blast furnace is started for smelting, air is blown into the blast furnace, that is, air is sent into the blast furnace through tuyeres. After the blast furnace is shut down, the air supply is stopped.

[0045] Figure 1 is a flowchart of a method for insulating the hearth of a blast furnace after shutdown provided by an embodiment of the present application. As Figure 1 shown, the method includes:

[0046] Step S110: After the blast furnace is shut down, obtain the heat load and carbon brick temperature of the hearth, and spray a preset mass of heat-insulating agent into the hearth;

[0047] In the embodiment of the present application, after the blast furnace is shut down, the heat load and carbon brick temperature of the hearth will gradually decrease. The temperature of the carbon brick can be collected by a thermocouple to understand the change of the carbon brick temperature. The inlet temperature and outlet temperature of the cooling stave can be collected by a temperature sensor, and the actual cooling water volume of the cooling stave can be collected by a flow sensor. Based on the temperature difference between the inlet temperature and the outlet temperature and the actual cooling water volume, the heat load of the hearth can be calculated to understand the change of the heat load. Among them, the thermocouple can be arranged 1.7 m below the deadman of the blast furnace to more accurately measure the temperature of the carbon brick.

[0048] After the blast furnace is shut down, a heat-insulating agent is sprayed into the hearth. The heat-insulating agent physically insulates the hearth to prevent the entry of gas (cold air) and reduce the heat loss caused by air flow to the blast furnace. At the same time, in order to ensure the spraying effect, the spraying mass can be calibrated in advance so that the heat-insulating agent has a better effect of isolating air or gas at this mass. Before spraying, the coke heap tip in the hearth can be cleaned first to ensure the spraying effect.

[0049] Figure 2 is a schematic diagram of a tuyere layout structure provided by an embodiment of the present application. As Figure 2 shown, the blast furnace includes a plurality of tuyeres 1. Before spraying the heat-insulating agent, one or more target tuyeres 2 can be determined from the plurality of tuyeres 1, and then the middle cylinder corresponding to the target tuyere 2 is removed. After removal, a spray gun can be inserted into the target tuyere 2 for spraying to obtain a better spraying effect. Among them, the middle cylinder is used to seal and adjust the tuyere, control parameters such as the air flow, combustion, and temperature inside the blast furnace, and ensure the stable operation of the blast furnace. The spray gun is used to spray the heat-insulating agent, and the spray gun can be of an extended type for better spraying.

[0050] In the embodiment of the present application, a mixer, an air compressor, and a spraying machine can be used in cooperation to complete the spraying of the heat-insulating agent.

[0051] Exemplarily, one target tuyere 2 can be determined every two tuyeres 1. AsFigure 2 It includes 42 tuyeres 1, then there are 14 target tuyeres 2, and correspondingly 14 middle cylinders will be removed, which facilitates the spraying of the thermal insulation agent by the spray gun. Of course, other methods for determining the number and position of the target tuyeres are also possible, and specifically, it can be determined according to the actual situation on site and the spraying requirements.

[0052] Optionally, the method further includes:

[0053] Obtain the volume density of the thermal insulation agent, the radius of the hearth, and the preset spraying thickness; determine the preset mass according to the volume density, radius, and spraying thickness.

[0054] In the embodiment of the present application, the radius of the hearth can be obtained from the design parameters of the blast furnace; the spraying thickness can be designed in advance. For example, the spraying thickness range is 150 - 200 mm; the volume density of the thermal insulation agent is obtained from the performance indicators of the selected thermal insulation agent. Table 1 is a statistical table of the performance indicators of a thermal insulation agent provided in the embodiment of the present application:

[0055] Table 1

[0056]

[0057]

[0058] In the embodiment of the present application, the mass of the sprayed thermal insulation agent can be calculated by formula (1):

[0059] WT = π × r 2 × h × ρ; (1)

[0060] Wherein, WT represents the mass of the sprayed thermal insulation agent, r represents the radius, h represents the spraying thickness, and ρ represents the volume density.

[0061] Optionally, after step S110, the method further includes:

[0062] Obtain the gas concentration in the blast furnace; if the gas concentration is greater than the preset concentration threshold, spray additional thermal insulation agent into the hearth.

[0063] In the embodiment of the present application, after spraying the preset mass of thermal insulation agent into the hearth, detect the change in the blast furnace gas concentration to understand the effect of the currently sprayed thermal insulation agent in isolating the gas. If the gas concentration is greater than the concentration threshold, it indicates that the current isolation effect is not good enough, and additional thermal insulation agent can be sprayed into the hearth. The additional mass can be determined according to the difference between the gas concentration and the concentration threshold. If the gas concentration is less than or equal to the concentration threshold, it indicates that the current isolation effect is good and no additional thermal insulation agent needs to be sprayed. Among them, the concentration threshold is 160 ppm.

[0064] Step S120: Determine the minimum cooling water volume of the cooling stave according to at least one of the heat load and the carbon brick temperature, and input the cooling water with the minimum cooling water volume into the cooling stave.

[0065] Among them, the minimum cooling water volume is less than the standard cooling water volume, and the standard cooling water volume is the cooling water volume input into the cooling stave when the blast furnace is started.

[0066] In the embodiment of the present application, after the blast furnace is shut down, the carbon brick temperature and heat load of the hearth will slowly decrease. However, the carbon brick temperature and heat load are still relatively high just after shutdown, and the inner wall of the blast furnace still needs to be cooled by cooling water to prevent damage to the carbon brick caused by too high carbon brick temperature and heat load. Therefore, the minimum cooling water volume of the cooling stave can be determined according to the heat load and the carbon brick temperature. At the minimum cooling water volume, the carbon brick can be protected, the heat of the slag absorbed by the cooling water can be reduced, the heat loss of the hearth can be reduced, thereby reducing the amount of coke additionally supplemented due to the heat loss of the hearth when the blast furnace is started next time, and it is beneficial to discharge the slag and iron stored in the hearth after starting the furnace, so that the blast furnace can be quickly restored.

[0067] Optionally, step S120 includes:

[0068] If the heat load is less than the preset first heat load threshold and greater than the preset second heat load threshold, determine that the minimum cooling water volume of the cooling stave is the preset first cooling water volume; if the heat load is less than or equal to the second heat load threshold and the carbon brick temperature is greater than the preset temperature threshold, determine that the minimum cooling water volume of the cooling stave is the first cooling water volume; if the heat load is less than or equal to the second heat load threshold and the carbon brick temperature is less than or equal to the temperature threshold, determine that the minimum cooling water volume of the cooling stave is the preset second cooling water volume.

[0069] Among them, the first cooling water volume is greater than the second cooling water volume. The first heat load threshold is greater than the second heat load threshold.

[0070] In the embodiment of the present application, if the heat load is less than the preset first heat load threshold and greater than the preset second heat load threshold, it indicates that the time since the blast furnace has been shut down is relatively short and the heat load is still relatively high. Then, the minimum cooling water volume of the cooling stave is determined as the relatively high first cooling water volume, and the inner wall of the blast furnace is cooled with a relatively strong cooling intensity to protect the carbon bricks. If the heat load is less than or equal to the second heat load threshold and the temperature of the carbon bricks is greater than the preset temperature threshold, it indicates that the time since the blast furnace has been shut down is relatively long, the heat load has decreased significantly, but the temperature of the carbon bricks is still very high. Then, the minimum cooling water volume of the cooling stave is still determined as the relatively high first cooling water volume, and the inner wall of the blast furnace is still cooled with a relatively strong cooling intensity to protect the carbon bricks. If the heat load is less than or equal to the second heat load threshold and the temperature of the carbon bricks is less than or equal to the temperature threshold, it indicates that the heat load is very low and the temperature of the carbon bricks is also very low, and the risk of damage to the carbon bricks due to high temperature is greatly reduced. Then, the minimum cooling water volume of the cooling stave is determined as the relatively low second cooling water volume, so that the cooling stave operates with less cooling water volume, further reducing the heat of the slag carried by the cooling water.

[0071] Optionally, the second cooling water volume is 0.

[0072] In the embodiment of the present application, when the heat load is very low and the temperature of the carbon bricks is also very low, the inner wall of the blast furnace no longer needs to be cooled down, and the cooling water of the cooling stave can be directly stopped, making the heat loss of the slag in this stage slower and further reducing the heat loss of the blast furnace.

[0073] Among them, the first cooling water volume is less than the standard cooling water volume, and the standard cooling water volume is the cooling water volume input into the cooling stave when the blast furnace is started.

[0074] In the embodiment of the present application, when the blast furnace is started, due to the high temperature in the furnace, the cooling water volume input into the cooling stave is also relatively high. The cooling water volume at this time is recorded as the standard cooling water volume. After the furnace is shut down, due to the decrease in the heat load and the temperature of the carbon bricks, the first cooling water volume and the second cooling water volume input into the cooling stave are both less than the standard cooling water volume, so as to protect the carbon bricks while reducing the heat of the slag carried away by the cooling water.

[0075] Optionally, step S120 further includes:

[0076] First step, obtain the time difference between the current moment and the planned air supply moment of the blast furnace to obtain the target duration, and the planned air supply moment is the air supply moment before the next start-up of the blast furnace;

[0077] Second step, determine the minimum cooling water volume of the cooling stave according to at least one of the heat load, the temperature of the carbon bricks, and the target duration.

[0078] Optionally, the second step includes:

[0079] If the heat load is less than a preset first heat load threshold and greater than a preset second heat load threshold, or if the target duration is less than a preset duration threshold, then determine that the minimum cooling water volume of the cooling stave is a preset first cooling water volume;

[0080] If the heat load is less than or equal to the second heat load threshold and the carbon brick temperature is greater than a preset temperature threshold, then determine that the minimum cooling water volume of the cooling stave is the first cooling water volume;

[0081] If the heat load is less than or equal to the second heat load threshold, the carbon brick temperature is less than or equal to the temperature threshold, and the target duration is greater than or equal to the duration threshold, then determine that the minimum cooling water volume of the cooling stave is a preset second cooling water volume;

[0082] Wherein, the first cooling water volume is greater than the second cooling water volume.

[0083] In the embodiments of the present application, after the blast furnace is constructed, the next furnace start-up will be carried out to continue smelting. Before the furnace start-up, air is blown into the blast furnace, and when blowing air, it is necessary to increase the cooling water volume of the cooling stave. Therefore, when determining the cooling water volume, the time difference between the current moment and the planned air-blowing moment of the blast furnace can also be considered.

[0084] Specifically, if the heat load is less than a preset first heat load threshold and greater than a preset second heat load threshold, or if the target duration is less than a preset duration threshold, that is, in the case of a relatively high heat load, or when the current moment is relatively close to the planned air-blowing moment, then determine that the minimum cooling water volume of the cooling stave is the relatively high first cooling water volume, and cool the inner wall of the blast furnace with a stronger cooling intensity to protect the carbon bricks or make preparations for the next furnace start-up; if the heat load is less than or equal to the second heat load threshold and the carbon brick temperature is greater than a preset temperature threshold, it indicates that the blast furnace has been shut down for a relatively long time, the heat load has decreased significantly, but the carbon brick temperature is still very high, then determine that the minimum cooling water volume of the cooling stave is the first cooling water volume, and still cool the inner wall of the blast furnace with a stronger cooling intensity to protect the carbon bricks; if the heat load is less than or equal to the second heat load threshold, the carbon brick temperature is less than or equal to the temperature threshold, and the target duration is greater than or equal to the duration threshold, it indicates that the heat load is very low, the carbon brick temperature is also very low, the risk of damage to the carbon bricks due to high temperature is greatly reduced, and the current moment is still relatively far from the planned air-blowing moment, and there is no need to make preparations for the next furnace start-up yet, then determine that the minimum cooling water volume of the cooling stave is the relatively low second cooling water volume, so that the cooling stave operates with less cooling water volume, and further reduces the heat of the slag carried by the cooling water.

[0085] Wherein, the second cooling water volume can be 0.

[0086] In the embodiments of the present application, after the next furnace start-up of the blast furnace, if the heat load of the hearth is greater than or equal to the first heat load threshold, then input cooling water with a standard cooling water volume into the cooling stave to protect the carbon bricks from being damaged due to high temperature.

[0087] Exemplarily, the standard cooling water volume is 7500 m 3 / h, the first cooling water volume is 2500 m 3 / h, the second cooling water volume is 0, the first heat load threshold is 3.5×10 6 kW, the second heat load threshold is 3.0×10 6 kW, the temperature threshold is 400 °C, and the duration threshold is 12 hours.

[0088] The method in the embodiment of the present application reduces the heat loss caused by air flow to the hearth by spraying heat preservation agent; according to the heat load of the hearth and the carbon brick temperature, the minimum cooling water volume of the cooling stave is determined, which can reduce the heat loss caused by the cooling water to the hearth, thereby effectively reducing the heat loss of the hearth after the blast furnace is stopped with an empty stockline, providing strong support for reducing the coke consumption during furnace start-up and rapid recovery.

[0089] Based on the same inventive concept, the embodiment of the present invention also provides a heat preservation device for the hearth after the blast furnace is stopped, Figure 3 which is a structural block diagram of a heat preservation device for the hearth after the blast furnace is stopped provided by the embodiment of the present invention. As Figure 3 shown, the device 300 includes a spraying module 301 and a cooling module 302.

[0090] The spraying module 301 is configured to obtain the heat load of the hearth and the carbon brick temperature after the blast furnace is stopped, and spray a preset mass of heat preservation agent into the hearth;

[0091] The cooling module 302 is configured to determine the minimum cooling water volume of the cooling stave according to at least one of the heat load and the carbon brick temperature, and input cooling water with the minimum cooling water volume to the cooling stave;

[0092] Wherein, the minimum cooling water volume is less than the standard cooling water volume, and the standard cooling water volume is the cooling water volume input into the cooling stave during the start-up of the blast furnace.

[0093] Optionally, the cooling module 302 is further configured to:

[0094] If the heat load is less than the preset first heat load threshold and greater than the preset second heat load threshold, then determine the minimum cooling water volume of the cooling stave as the preset first cooling water volume; wherein, the first heat load threshold is greater than the second heat load threshold;

[0095] If the heat load is less than or equal to the second heat load threshold and the carbon brick temperature is greater than the preset temperature threshold, then determine the minimum cooling water volume of the cooling stave as the first cooling water volume;

[0096] If the heat load is less than or equal to the second heat load threshold and the carbon brick temperature is less than or equal to the temperature threshold, then determine the minimum cooling water volume of the cooling stave as the preset second cooling water volume;

[0097] The first cooling water volume is greater than the second cooling water volume.

[0098] Optionally, the cooling module 302 includes:

[0099] An acquisition unit is used to obtain the time difference between the current time and the planned air supply time of the blast furnace to obtain a target duration. The planned air supply time is the air supply time before the next start of the blast furnace;

[0100] The determining unit is used to determine the minimum cooling water volume of the cooling wall according to at least one of the heat load, the carbon brick temperature and the target time.

[0101] Optionally, the determining unit is further configured to:

[0102] If the heat load is less than a preset first heat load threshold and greater than a preset second heat load threshold, or if the target duration is less than a preset duration threshold, determining the minimum cooling water flow of the cooling wall to be the preset first cooling water flow;

[0103] If the heat load is less than or equal to the second heat load threshold and the carbon brick temperature is greater than the preset temperature threshold, determining the minimum cooling water flow of the cooling wall to be the first cooling water flow;

[0104] If the heat load is less than or equal to the second heat load threshold, the carbon brick temperature is less than or equal to the temperature threshold, and the target duration is greater than or equal to the duration threshold, the minimum cooling water flow of the cooling wall is determined to be the preset second cooling water flow;

[0105] The first cooling water volume is greater than the second cooling water volume.

[0106] Optionally, the device 300 further includes a supplementary spraying module, configured to:

[0107] Obtain the gas concentration in the blast furnace;

[0108] If the gas concentration is greater than the preset concentration threshold, the insulation agent is sprayed into the furnace.

[0109] Optionally, the second cooling water volume is 0.

[0110] Optionally, the first cooling water volume is less than the standard cooling water volume, and the standard cooling water volume is the cooling water volume input into the cooling wall when the blast furnace is started.

[0111] Optionally, the apparatus 300 further includes a determining module, configured to:

[0112] Obtain the bulk density of the insulation, the radius of the furnace and the preset spraying thickness;

[0113] The quality of the preset is determined based on the bulk density, radius and spray thickness.

[0114] It can be understood that, for the device provided in the above embodiments, only the division of the above functional modules is used for illustration. In practical applications, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

[0115] An embodiment of the present invention further provides an electronic device, which may include a processor and a memory, and the processor and the memory may be communicatively connected to each other through a bus or other means.

[0116] The processor may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application, or may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. chips, or a combination of the above types of chips.

[0117] The memory may include a mass storage for data or instructions. By way of example and not limitation, the memory may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive, or a combination of two or more of these. In a suitable case, the memory may include a removable or non-removable (or fixed) medium. In a suitable case, the memory may be internal or external to the electronic device. In a particular embodiment, the memory may be a non-volatile solid state memory.

[0118] In one example, the memory may be a read only memory (ROM). In one example, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or a flash memory, or a combination of two or more of these.

[0119] The processor reads and executes the computer program instructions stored in the memory to implement any one of the above-mentioned methods for insulating the hearth after the blast furnace is shut down in the above embodiments.

[0120] In one example, the electronic device may further include a communication interface and a bus. Among them, the processor, the memory, and the communication interface are connected through the bus and complete communication with each other. The communication interface is mainly used to implement communication between various modules, devices, units, and / or devices in the embodiments of the present application. In a suitable case, the bus may include one or more buses.

[0121] In addition, in combination with the method for insulating the hearth after the blast furnace is shut down in the above embodiments, the embodiments of the present invention can be implemented by providing a computer-readable storage medium. Computer program instructions are stored on the computer-readable storage medium; when the computer program instructions are executed by the processor, any one of the above-mentioned methods for insulating the hearth after the blast furnace is shut down is implemented.

[0122] Those skilled in the art can understand that all or part of the processes in the above-mentioned method embodiments can be completed by instructing relevant hardware through a computer program. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the above-mentioned method embodiments. Among them, the storage medium can be a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory, a Hard Disk Drive (HDD), or a Solid-State Drive (SSD), etc.; the storage medium can also include a combination of the above types of memories.

[0123] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0124] A method, device, equipment and medium for insulating a hearth after a furnace is shut down according to an embodiment of the present invention. After the blast furnace is shut down, the heat load and carbon brick temperature of the hearth are obtained, and a preset mass of heat insulating agent is sprayed into the hearth, and the hearth is insulated by this physical heat insulating method of the heat insulating agent; according to at least one of the heat load and the carbon brick temperature, the minimum cooling water volume of the cooling stave is determined, and the cooling water with the minimum cooling water volume is input into the cooling stave. The minimum cooling water volume is less than the standard cooling water volume, and the standard cooling water volume is the cooling water volume input into the cooling stave when the blast furnace is started up. While ensuring that the heat load and carbon brick temperature of the hearth will not be too low, the cooling water volume of the cooling stave is reduced as much as possible, and the heat of the slag carried away by the cooling water is reduced, so that the slag iron will not cool down too fast. This method reduces the heat loss of the hearth in two ways, can reduce the amount of coke additionally supplemented due to the heat loss of the hearth when the blast furnace is started up next time, and is beneficial to discharging the slag iron stored in the hearth after starting up, so that the blast furnace can be quickly restored.

[0125] In the specification provided herein, a large number of specific details are set forth. It is understood, however, that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this specification.

[0126] Similarly, it should be understood that in order to streamline this disclosure and assist in understanding one or more of the various inventive aspects, in the foregoing description of the exemplary embodiments of the present invention, the various features of the present invention are sometimes grouped together in a single embodiment, figure, or description thereof. However, the disclosed method should not be construed as reflecting the intention that: the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, the inventive aspects lie in less than all the features of the single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of the present invention.

[0127] It should be noted that the above embodiments illustrate the present invention rather than limit the present invention, and those skilled in the art can design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention can be implemented by means of hardware including several different elements and by means of a suitably programmed computer. In the unit claims listing several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, and third, etc. does not denote any order. These words may be interpreted as names.

Claims

1. A method for insulating the hearth after a blast furnace is shut down, characterized in that, The blast furnace includes a hearth and a cooling stave, and the method includes: After the blast furnace is shut down, obtaining the heat load of the hearth and the carbon brick temperature, and spraying a preset mass of heat-insulating agent into the hearth; Determining the minimum cooling water volume of the cooling stave according to at least one of the heat load and the carbon brick temperature, and inputting cooling water with the minimum cooling water volume into the cooling stave; Wherein, the minimum cooling water volume is less than the standard cooling water volume, and the standard cooling water volume is the cooling water volume input into the cooling stave when the blast furnace is started up.

2. The heat preservation method for the hearth after the blast furnace is shut down according to claim 1, characterized in that, The determining the minimum cooling water volume of the cooling stave according to at least one of the heat load and the carbon brick temperature includes: If the heat load is less than a preset first heat load threshold and greater than a preset second heat load threshold, determining the minimum cooling water volume of the cooling stave as a preset first cooling water volume; wherein, the first heat load threshold is greater than the second heat load threshold; If the heat load is less than or equal to the second heat load threshold and the carbon brick temperature is greater than a preset temperature threshold, determining the minimum cooling water volume of the cooling stave as the first cooling water volume; If the heat load is less than or equal to the second heat load threshold and the carbon brick temperature is less than or equal to the temperature threshold, determining the minimum cooling water volume of the cooling stave as a preset second cooling water volume; Wherein, the first cooling water volume is greater than the second cooling water volume.

3. The heat preservation method for the hearth after the blast furnace is shut down according to claim 1, characterized in that, The determining the minimum cooling water volume of the cooling stave according to at least one of the heat load and the carbon brick temperature includes: Obtaining the time difference between the current moment and the planned air supply moment of the blast furnace to obtain a target duration, and the planned air supply moment is the air supply moment before the next start-up of the blast furnace; Determining the minimum cooling water volume of the cooling stave according to at least one of the heat load, the carbon brick temperature and the target duration.

4. The heat preservation method for the hearth after the blast furnace is shut down according to claim 3, characterized in that, The determining the minimum cooling water volume of the cooling stave according to at least one of the heat load, the carbon brick temperature and the target duration includes: If the heat load is less than a preset first heat load threshold and greater than a preset second heat load threshold, or if the target duration is less than a preset duration threshold, determining the minimum cooling water volume of the cooling stave as a preset first cooling water volume; If the heat load is less than or equal to the second heat load threshold and the carbon brick temperature is greater than a preset temperature threshold, determining the minimum cooling water volume of the cooling stave as the first cooling water volume; If the heat load is less than or equal to the second heat load threshold, the carbon brick temperature is less than or equal to the temperature threshold, and the target duration is greater than or equal to the duration threshold, determining the minimum cooling water volume of the cooling stave as a preset second cooling water volume; Wherein, the first cooling water volume is greater than the second cooling water volume.

5. The heat preservation method for the hearth after the blast furnace is shut down according to claim 1, characterized in that, After spraying a preset mass of heat-insulating agent into the hearth, the method further includes: Obtaining the gas concentration in the blast furnace; If the gas concentration is greater than a preset concentration threshold, spraying additional heat-insulating agent into the hearth.

6. The method for insulating the hearth after the blast furnace is shut down according to claim 2 or 3, characterized in that, The second cooling water volume is 0.

7. The heat preservation method for the hearth after the blast furnace is shut down according to claim 1, characterized in that, Before spraying a preset mass of heat-insulating agent into the hearth, the method further includes: Obtain the bulk density of the heat-insulating agent, the radius of the hearth, and a preset spraying thickness; Determine a preset mass according to the bulk density, the radius, and the spraying thickness.

8. An insulating device for a blast furnace hearth after furnace shutdown, characterized in that, The blast furnace includes a hearth and a cooling stave, and the device includes: A spraying module, configured to obtain the heat load of the hearth and the carbon brick temperature after the blast furnace is shut down, and spray a preset mass of the heat-insulating agent into the hearth; A cooling module, configured to determine the minimum cooling water volume of the cooling stave according to at least one of the heat load and the carbon brick temperature, and input cooling water with the minimum cooling water volume to the cooling stave; Wherein, the minimum cooling water volume is less than the standard cooling water volume, and the standard cooling water volume is the cooling water volume input into the cooling stave when the blast furnace is started up.

9. An electronic device, characterized in that, Comprising: A memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to execute the method according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to execute the method according to any one of claims 1-7.

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