Control method and control device of blast furnace coal injection system and readable storage medium

Abstract

The invention discloses a control method and device of a blast furnace coal injection system and a readable storage medium, the blast furnace coal injection system comprises multiple injection tanks, the multiple injection tanks comprise a working tank for executing injection operation and a standby tank for executing pressurizing operation, and the control method comprises the steps that the remaining injection time of the working tank is obtained; the set pressure of the standby tank is obtained, and the current pressure of the standby tank is obtained through detection; according to the remaining blowing time, the set pressure and the current pressure, the gas flow is obtained; and according to the gas flow, the gas inlet flow of the standby tank during pressurizing operation is controlled. The problem that in the prior art, due to the fact that effective control is lacked between the pressurizing process of the standby tank and the injection process of the working tank, the operation efficiency of the blast furnace coal injection system is reduced is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of blast furnace coal injection, and in particular to a control method and control device of a blast furnace coal injection system, and a readable storage medium. BACKGROUND

[0002] Blast furnace coal injection technology is to replace part of coke with coal powder and inject it into the blast furnace tuyere, which can effectively reduce coke ratio, reduce coking pollution and improve energy utilization efficiency, and is one of the core processes of modern blast furnace ironmaking. The blast furnace coal injection parallel injection system is a coal injection system that uses two or more injection tanks for parallel injection. In the parallel injection system, usually one injection tank is in working state and is responsible for injecting coal powder into the blast furnace, while the other injection tank is in standby state. The injection tank in standby state needs to be pressurized so that its internal pressure reaches a set value, so as to switch in time when the working tank runs out of coal powder.

[0003] In the prior art, the standby tank is usually pressurized by fixed gas flow or by controlling the size of the gas flow. This way is difficult to accurately match the remaining injection time of the working tank, which may cause the pressurization process and the injection process of the working tank to be mismatched in time. Specifically, due to the lack of effective control between the pressurization process of the standby tank and the injection process of the working tank, the following problems may occur: 1. The standby tank is pressurized too quickly and reaches the set pressure when there is still enough coal powder in the working tank, so the standby tank stops pressurizing, which affects the uniformity and stability of subsequent injection because the coal powder in the standby tank cannot maintain a good flow state; 2. The standby tank is pressurized too slowly and still does not reach the set pressure when the working tank runs out of coal powder, which causes the coal injection to be interrupted and affects the stable operation of the blast furnace. These problems will reduce the operating efficiency of the blast furnace coal injection system. SUMMARY

[0004] The purpose of the present application is to provide a control method and control device of a blast furnace coal injection system, and a readable storage medium, to solve the problem of reduced operating efficiency of the blast furnace coal injection system caused by the lack of effective control between the pressurization process of the standby tank and the injection process of the working tank in the prior art.

[0005] To solve the above technical problems, the present application is implemented by using the following technical solutions:

[0006] In a first aspect, the present application provides a control method of a blast furnace coal injection system, the blast furnace coal injection system comprising a plurality of injection tanks, the plurality of injection tanks comprising a working tank performing an injection operation and a standby tank performing a pressurization operation, the control method comprising:

[0007] obtaining a remaining injection time of the working tank;

[0008] obtaining a set pressure of the standby tank and detecting a current pressure of the standby tank;

[0009] obtaining the gas flow according to the remaining blowing time, the set pressure and the current pressure;

[0010] controlling the gas inflow of the standby tank during the pressure charging operation according to the gas flow.

[0011] Compared with the prior art, the technical effects achieved by the technical scheme are: by controlling the pressure charging process of the standby tank according to the blowing time of the working tank, the set pressure of the standby tank is ensured to be reached just when the working tank runs out of coal powder, the pressure charging of the standby tank is avoided to be completed in advance, the coal powder in the tank is kept in a good flow state, the uniformity and stability of subsequent blowing are improved, the interruption of coal injection caused by untimely pressure charging of the standby tank is prevented, the continuity of the blast furnace coal injection process is ensured, and the stable operation of the blast furnace is maintained. Specifically, the blast furnace coal injection system of the present application includes at least two blowing tanks, one of which is used as a working tank to perform blowing operation, and the other is used as a standby tank to perform pressure charging operation, when the working tank runs out of coal powder, the standby tank is switched to a new working tank to perform blowing operation, and the working tank is switched to a new standby tank to perform pressure charging operation, and so on. In order to ensure that the blowing operation of the working tank and the pressure charging operation of the standby tank are the same in time, first, the remaining blowing time of the working tank is obtained, from which the pressure charging time of the standby tank can be known; then the set pressure of the standby tank is obtained, and the current pressure of the standby tank is detected to determine the set pressure and the current pressure that the pressure charging needs to reach; then, according to the remaining blowing time, the set pressure and the current pressure, the gas flow is obtained, and the correlation between time, pressure and flow is established; finally, according to the gas flow, the gas inflow of the standby tank during the pressure charging operation is controlled, and the precise control of the pressure charging process is realized. This control method can dynamically adjust the pressure charging speed of the standby tank according to the remaining pressure charging time of the working tank, so that the pressure charging completion time matches the blowing end time of the working tank, thereby avoiding the problems of too fast or too slow pressure charging.

[0012] Further, the gas flow is obtained according to the remaining blowing time, the set pressure and the current pressure, including: the gas flow is obtained by the following calculation formula: ; wherein v is the gas flow, P is the set pressure, P1 is the current pressure, V is the volume of the standby tank, and t is the remaining blowing time; the volume of the standby tank is a constant greater than zero.

[0013] Compared with the prior art, the technical effects achieved by the technical scheme are: by the calculation formula of the gas flow, the gas flow required for the pressure charging operation of the standby tank is directly obtained according to the set pressure, the current pressure, the volume of the standby tank and the remaining blowing of the working tank, and the precise control of the pressure charging operation is realized.

[0014] Further, the blast furnace coal injection system comprises a bottom fluidization passage and a cone fluidization passage for pressurizing the standby tank, and the gas inflow of the standby tank during the pressurizing operation is controlled according to the gas flow, comprising: calculating the bottom gas flow and the cone gas flow according to the gas flow; controlling the gas inflow of the bottom fluidization passage to be the bottom gas flow; controlling the gas inflow of the cone fluidization passage to be the cone gas flow; wherein the bottom gas flow is obtained by the following calculation formula: ; the calculation formula of the cone gas flow is: ; wherein: v f is the bottom gas flow, v p is the cone gas flow, v is the gas flow, and a and b are constants greater than zero, and a+b=100%.

[0015] Compared with the prior art, the technical effects achieved by the technical scheme are: the pressurizing operation of the standby tank is simultaneously performed by the bottom fluidization passage and the cone fluidization passage, and the two gas flows jointly stir the pulverized coal in the standby tank, thereby enhancing the fluidity of the pulverized coal.

[0016] Further, the remaining injection time of the working tank is obtained, comprising: detecting the current pulverized coal amount and the coal injection rate of the working tank; calculating the remaining injection time according to the current pulverized coal amount, the coal injection rate and the minimum pulverized coal amount of the working tank; wherein the remaining injection time is obtained by the following calculation formula: ; wherein: t2 is the remaining injection time, W m is the current pulverized coal amount, W b is the minimum pulverized coal amount, and Q s is the coal injection rate; the minimum pulverized coal amount is a constant greater than zero.

[0017] Compared with the prior art, the technical effects achieved by the technical scheme are: according to the current pulverized coal amount and the coal injection rate of the working tank, and the preset minimum pulverized coal amount of the working tank, the remaining injection time of the working tank under the current coal injection rate can be obtained. By combining the real-time detected pulverized coal amount and the coal injection rate with the preset minimum pulverized coal amount threshold, the remaining injection time of the working tank can be calculated in real time, thereby providing a time standard for the pressurizing control of the standby tank.

[0018] Further, the set pressure of the standby tank is obtained, comprising: obtaining the coal injection amount of the working tank; calculating the set pressure according to the coal injection amount; wherein the set pressure is obtained by the following calculation formula: ; wherein: P is the set pressure, X is the coal injection amount, and A is a constant greater than zero.

[0019] Compared with the prior art, the technical effects achieved by the technical scheme are: by adjusting the set pressure of the standby tank in real time according to the coal injection amount, it is ensured that the set pressure of the standby tank can match the coal injection amount.

[0020] Further, the blast furnace coal injection system comprises a top pressure supplementing passage for supplementing pressure to the standby tank, and further comprises: when the current pressure is greater than or equal to the preset pressure, controlling the top pressure supplementing passage to perform a top pressure supplementing operation on the standby tank; wherein the preset pressure is obtained by the following calculation formula: ; wherein: P m is the preset pressure, and B is a constant greater than zero.

[0021] Compared with the prior art, the technical effects achieved by the technical scheme are: with the proceeding of the pressure charging operation, when the current pressure of the standby tank reaches or exceeds the preset pressure, the top pressure supplementing passage is controlled to perform a top pressure supplementing operation on the standby tank, so that the gas is filled into the top of the injection tank, and the two gas flows jointly agitate the pulverized coal in the tank, so that the pulverized coal fills every region in the tank, and the flowability of the pulverized coal is further enhanced.

[0022] Further, the blast furnace coal injection system comprises a fast pressure charging passage for fast charging pressure to the standby tank and a pressure releasing passage for releasing pressure to the standby tank, and further comprises: judging the size relationship between the remaining injection time and the preset time; in the case that the remaining injection time is less than or equal to the preset time, judging the relationship between the current pressure and the set pressure; in the case that the difference between the set pressure and the current pressure is greater than or equal to the pressure difference constant, controlling the fast pressure charging passage to perform a fast pressure charging operation on the standby tank; and / or in the case that the difference between the set pressure and the current pressure is less than or equal to the negative of the pressure difference constant, controlling the pressure releasing passage to perform a pressure releasing operation on the standby tank; wherein the preset time and the pressure difference constant are constants greater than zero.

[0023] Compared with the prior art, the technical effects achieved by the technical scheme are: when the difference between the set pressure and the current pressure is greater than or equal to the pressure difference constant, the fast pressure charging passage is enabled to charge pressure to the standby tank, so as to ensure that the standby tank completes the pressure charging operation before the injection operation ends; when the difference between the set pressure and the current pressure is less than or equal to the pressure difference constant, the pressure releasing passage is enabled to release pressure to the standby tank, so that the current pressure of the standby tank is reduced to the set pressure, and the current pressure of the standby tank is prevented from being too high to cause excessive fluidization of the pulverized coal or overloading of the equipment.

[0024] In a second aspect, the application further provides a control system of a blast furnace coal injection system, comprising: a first obtaining unit for obtaining the remaining injection time of a working tank, a second obtaining unit for obtaining the set pressure of a standby tank and detecting the current pressure of the standby tank; a calculation unit for obtaining the gas flow according to the remaining injection time, the set pressure and the current pressure; and a control unit for controlling the gas inflow of the standby tank according to the gas flow.

[0025] In a third aspect, the present application also provides a readable storage medium, which stores a program or instructions, and the program or instructions are executed by a processor to implement the steps of the control method according to any one of the preceding aspects.

[0026] In a fourth aspect, the present application also provides a blast furnace coal injection system, which implements the steps of the control method according to any one of the preceding aspects.

[0027] Compared with the prior art, the present application has the following beneficial effects:

[0028] 1. By controlling the pressure charging process of the standby tank according to the injection time of the working tank, it is ensured that the standby tank reaches the set pressure when the working tank runs out of coal powder, thereby avoiding the premature completion of the pressure charging of the standby tank, maintaining the good flow state of the coal powder in the tank, improving the uniformity and stability of subsequent injection, preventing the interruption of coal injection due to the untimely pressure charging of the standby tank, ensuring the continuity of the blast furnace coal injection process, and maintaining the stable operation of the blast furnace. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0030] Figure 1 is a flowchart of an embodiment one of the control method of the blast furnace coal injection system provided by the present application. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use.

[0032] Embodiment one:

[0033] The present application provides a control method of a blast furnace coal injection system, which is executed by the blast furnace coal injection system. The blast furnace coal injection system includes a plurality of injection tanks, one of which is used as a working tank to perform injection operation, and another is used as a standby tank to perform pressure charging operation. When the working tank runs out of coal powder, the standby tank is switched to a new working tank to perform injection operation, and the working tank is switched to a new standby tank to perform pressure charging operation, and so on.

[0034] Figure 1is a flow chart of a control method of a blast furnace coal injection system in Embodiment One of the present application. The flow chart only shows the logical sequence of the method described in the present embodiment, and in other possible embodiments of the present application, the steps shown or described can be completed in a different order from that shown on the premise that they do not conflict with each other. Figure 1

[0035] The control method provided in the present embodiment includes:

[0036] S100: obtaining the remaining injection time of the working tank;

[0037] S200: obtaining the set pressure of the standby tank and detecting the current pressure of the standby tank;

[0038] S300: obtaining the gas flow according to the remaining injection time, the set pressure and the current pressure;

[0039] S400: controlling the gas inflow of the standby tank when performing the pressure charging operation according to the gas flow.

[0040] Further, S100 includes:

[0041] detecting the current pulverized coal amount and the coal injection rate of the working tank;

[0042] calculating the remaining injection time according to the current pulverized coal amount, the coal injection rate and the minimum pulverized coal amount of the working tank; wherein the remaining injection time is obtained by the following calculation formula:

[0043]

[0044] In the formula, t2 is the remaining injection time, W m is the current pulverized coal amount, W b is the minimum pulverized coal amount, Q s is the coal injection rate.

[0045] It should be noted that the total weight of the injection tank is detected by the weighing device arranged on the injection tank, and the current pulverized coal amount is obtained by subtracting the weight of the injection tank from the total weight. The weighing device is a weighing sensor arranged outside the injection tank, which collects the total weight of the tank body in real time. The coal injection rate is calculated by real-time detection of the weight change of the injection tank. In the injection operation, the total weight of the injection tank is collected at a fixed time period, the weight difference between adjacent time points is calculated, and the coal injection rate is obtained by dividing the weight difference by the time period.

[0046] It should be noted that the minimum pulverized coal amount is a constant greater than zero. The minimum value of the minimum pulverized coal amount is set according to the minimum value of the pressure fluctuation caused by the insufficient pulverized coal amount in the injection tank, and a safety margin should be set.

[0047] ​​Furthermore, S200 includes:

[0048] Obtain the coal injection rate of the working tank;

[0049] The set pressure is calculated based on the coal injection rate; the set pressure is obtained using the following formula:

[0050] ;

[0051] In the formula: P is the set pressure, X is the coal injection rate, and A is a constant greater than zero.

[0052] It should be noted that the coal injection rate of the working pot is obtained based on the settings in the blast furnace injection system. The operator sets the coal injection rate according to the actual situation and inputs it into the system to obtain the coal injection rate of the working pot.

[0053] It should be noted that the value of A is set differently depending on the injection volume: when the injection volume is between 0 and 25 tons, A is set to 0.35; when the injection volume is between 25 and 35 tons, A is set to 0.45; and when the injection volume is greater than 35 tons, A is set to 0.55.

[0054] Specifically, the current pressure is obtained by a pressure measuring device installed on the injection tank, which is a pressure measuring valve.

[0055] Furthermore, the S300 includes:

[0056] The gas flow rate is obtained using the following formula:

[0057] ;

[0058] Where v is the gas flow rate, P is the set pressure, P1 is the current pressure, V is the spare tank volume, and t is the remaining injection time; the spare tank volume is a constant greater than zero.

[0059] Specifically, the blast furnace pulverized coal injection system includes a bottom fluidization passage and a cone fluidization passage for pressurizing the spare tank. Fluidizing gas is introduced into the bottom of the pulverized coal layer in the spare tank through the bottom fluidization passage and the cone fluidization passage, respectively. The fluidizing gas penetrates the pulverized coal layer, causing the pulverized coal particles to be suspended and exhibit fluid characteristics.

[0060] Furthermore, the S400 includes:

[0061] Based on the gas flow rate, the bottom gas flow rate and the cone gas flow rate are calculated; the bottom gas flow rate is obtained using the following formula: ;

[0062] The formula for calculating the gas flow rate in the cone section is: ;

[0063] In the formula: vf v represents the bottom gas flow rate. p Let v be the gas flow rate at the cone, a and b be constants greater than zero, and a + b = 100%.

[0064] The gas inflow rate in the bottom fluidization path is controlled to be the bottom gas flow rate; a bottom fluidization regulating valve is provided in the bottom fluidization path, and the gas inflow rate in the bottom fluidization path is adjusted to be the bottom gas flow rate by adjusting the bottom fluidization regulating valve.

[0065] The gas inflow rate in the conical fluidization passage is controlled to be the conical gas flow rate; a conical fluidization regulating valve is provided in the conical fluidization passage, and the gas inflow rate in the conical fluidization passage is adjusted to be the conical gas flow rate by adjusting the conical fluidization regulating valve.

[0066] Furthermore, the blast furnace pulverized coal injection system includes a top pressurization passage for pressurizing the spare pulverizer, and the control method further includes:

[0067] When the current pressure is greater than or equal to the preset pressure, the top pressure replenishment channel is controlled to perform a top pressure replenishment operation on the standby tank; the preset pressure is obtained by the following calculation formula: ;

[0068] In the formula: P m Preset pressure.

[0069] Specifically, the top pressure replenishment passage is connected to the top of the standby tank. The top pressure replenishment operation is used when the current pressure is close to the set pressure during the pressurization operation of the standby tank. Fluidizing gas is injected from the top of the standby tank through the top pressure replenishment passage. The fluidizing gas injected through the top pressure replenishment passage, the bottom fluidizing passage, and the cone fluidizing passage work together to blow the coal powder in the tank from both the top and bottom directions, so that the coal powder fills every area in the tank and further enhances the fluidity of the coal powder.

[0070] It should be noted that B is a percentage constant greater than zero. A is related to the volume of the injection tank; the larger the volume of the injection tank, the larger the value of B.

[0071] Furthermore, the blast furnace pulverized coal injection system includes a rapid pressurization passage for quickly pressurizing the spare tank and a pressure relief passage for depressurizing the spare tank. To prevent unexpected situations, such as when the remaining injection time of the current working tank is about to end and the current pressure of the spare tank has not yet reached the set pressure or has exceeded the set pressure, the control method also includes:

[0072] Determine the relationship between the remaining blowing time and the preset time;

[0073] If the remaining blowing time is less than or equal to the preset time, determine the relationship between the current pressure and the set pressure.

[0074] If the difference between the set pressure and the current pressure is greater than or equal to the differential pressure constant, control the rapid pressurization pathway to perform a rapid pressurization operation on the standby tank; and / or

[0075] If the difference between the set pressure and the current pressure is less than or equal to a negative number of the differential pressure constant, the pressure relief path is controlled to perform a pressure relief operation on the standby tank.

[0076] Among them, the preset time and pressure difference constant are constants greater than zero.

[0077] It should be noted that the preset time represents the safe time for the backup tank to perform rapid pressurization and depressurization operations. It is used to detect and assess the current pressure of the backup tank and execute appropriate actions as the remaining purging time is about to end, ensuring sufficient time for adjustment before the purging operation concludes. Those skilled in the art can set the preset time according to actual circumstances.

[0078] Specifically, the difference between the set pressure and the current pressure represents the degree of deviation between the current pressure and the set pressure in the standby tank. If the difference between the set pressure and the current pressure is greater than or equal to the differential pressure constant, it indicates that the current pressure in the standby tank is significantly lower than the set pressure, failing to meet the pressure requirements when switching to the working tank. In this case, the rapid pressurization path is opened to quickly pressurize the standby tank, bringing its current pressure to the set pressure within the remaining time. When the difference between the set pressure and the current pressure equals zero, the rapid pressurization path is closed, ending the rapid pressurization operation on the standby tank. If the difference between the set pressure and the current pressure is less than or equal to a negative number of the differential pressure constant, it indicates that the current pressure in the standby tank is significantly higher than the set pressure, potentially leading to excessive fluidization of the pulverized coal and overpressure in the equipment. In this case, the pressure relief path is opened to depressurize the standby tank, reducing the current pressure to the set pressure. When the difference between the set pressure and the current pressure equals zero, the pressure relief path is closed, ending the pressure relief operation on the standby tank.

[0079] Example 2:

[0080] This application also provides a control system for a blast furnace pulverized coal injection system, including:

[0081] The first obtaining unit is used to obtain the remaining injection time of the working tank.

[0082] The second acquisition unit is used to acquire the set pressure of the backup tank and detect the current pressure of the backup tank;

[0083] The calculation unit is used to obtain the gas flow rate based on the remaining injection time, the set pressure, and the current pressure;

[0084] The control unit is used to control the gas inflow rate to the spare tank based on the gas flow rate.

[0085] Specifically, the control system of the blast furnace pulverized coal injection system provided in this embodiment, wherein the first obtaining unit, the second obtaining unit, the calculation unit and the control unit cooperate to implement the control method of the blast furnace pulverized coal injection system as described in Embodiment 1 above, will not be repeated here.

[0086] Example 3:

[0087] This application also provides a readable storage medium on which a program or instruction is stored, and when the program or instruction is executed by a processor, it implements the steps of the control method for the blast furnace pulverized coal injection system as described in Embodiment 1 above.

[0088] The aforementioned readable storage medium may be any combination of one or more computer-readable media. A readable storage medium may be a computer-readable signal medium or a computer-readable storage medium. A readable storage medium may be, for example—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), or flash memory, optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a readable storage medium may be any tangible medium containing or storing a program that can be used by or in connection with an instruction execution system, apparatus, or device.

[0089] Example 4:

[0090] This application also provides a blast furnace pulverized coal injection system. The blast furnace pulverized coal injection system is equipped with a processor, a memory, and a program or instruction stored in the memory and executable on the processor. When the program or instruction is executed by the processor, it implements the control method of the blast furnace pulverized coal injection system as described in the above embodiments.

[0091] Specifically, in this embodiment, the blast furnace pulverized coal injection system is equipped with three injection tanks, which are arranged side by side. One injection tank serves as a storage tank for storing pulverized coal, while the other two injection tanks perform injection operations in a cyclical manner. Each injection tank operates in a cyclical alternation of charging, pressurizing, injection, and charging. When one injection tank is performing injection operations as the working tank, the other injection tank performs pressurizing operations as the backup tank. When the working tank is about to complete its injection operation, the backup tank automatically starts injection to ensure continuous pulverized coal injection into the blast furnace.

[0092] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0093] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A control method for a blast furnace pulverized coal injection system, the blast furnace pulverized coal injection system comprising a plurality of injection tanks, the plurality of injection tanks including a working tank for performing injection operations and a standby tank for performing pressurization operations, characterized in that, The control method includes: Obtain the remaining blowing time of the working tank; Obtain the set pressure of the backup tank and detect the current pressure of the backup tank; The gas flow rate is obtained based on the remaining injection time, the set pressure, and the current pressure; The gas flow rate is controlled based on the gas flow rate when the backup tank is pressurized.

2. The control method for the blast furnace pulverized coal injection system according to claim 1, characterized in that, The step of obtaining the gas flow rate based on the remaining injection time, the set pressure, and the current pressure includes: The obtained gas flow rate is calculated using the following formula: ； Where v is the gas flow rate, P is the set pressure, P1 is the current pressure, V is the spare tank volume, and t is the remaining injection time; the spare tank volume is a constant greater than zero.

3. The control method for a blast furnace pulverized coal injection system according to claim 1, wherein the blast furnace pulverized coal injection system includes a bottom fluidization passage and a conical fluidization passage for pressurizing the spare tank, characterized in that, The step of controlling the gas inflow rate of the backup tank during pressurization based on the gas flow rate includes: Based on the gas flow rate, the bottom gas flow rate and the cone gas flow rate are calculated; The gas inlet flow rate of the bottom fluidization passage is controlled to be the bottom gas flow rate; The gas inlet flow rate of the conical fluidization passage is controlled to be the conical gas flow rate; The bottom gas flow rate is obtained using the following formula: ; The formula for calculating the gas flow rate in the cone section is: ; In the formula: v f v is the bottom gas flow rate. p Let v be the gas flow rate of the cone, a and b be constants greater than zero, and a+b=100%.

4. The control method for the blast furnace pulverized coal injection system according to claim 1, characterized in that, Obtaining the remaining blowing time of the working tank includes: The current coal powder quantity and coal injection rate of the working tank are detected; The remaining injection time is calculated based on the current coal powder quantity, the coal injection rate, and the minimum coal powder quantity in the working tank. The remaining blowing time is obtained by the following calculation formula: ； Where: t2 is the remaining blowing time, W m W represents the current amount of pulverized coal. b Q is the minimum amount of pulverized coal. s The pulverized coal injection rate is defined as follows: the minimum pulverized coal quantity is a constant greater than zero.

5. The control method for a blast furnace pulverized coal injection system according to claim 1, characterized in that, Obtaining the set pressure of the backup tank includes: Obtain the coal injection rate of the working tank; The set pressure is calculated based on the coal injection volume; The set pressure is obtained by the following calculation formula: ; In the formula: P is the set pressure, X is the coal injection rate, and A is a constant greater than zero.

6. The control method for a blast furnace pulverized coal injection system according to claim 1, wherein the blast furnace pulverized coal injection system includes a top pressure replenishment passage for replenishing pressure to the spare tank, characterized in that, Also includes: When the current pressure is greater than or equal to the preset pressure, the top pressure replenishment passage is controlled to perform a top pressure replenishment operation on the spare tank; The preset pressure is obtained through the following calculation formula: ; In the formula: P m The preset pressure is B, which is a constant greater than zero.

7. The control method for a blast furnace pulverized coal injection system according to claim 1, wherein the blast furnace pulverized coal injection system includes a rapid pressurization passage for rapidly pressurizing the spare tank and a depressurization passage for depressurizing the spare tank, characterized in that, Also includes: Determine the relationship between the remaining blowing time and the preset time; If the remaining blowing time is less than or equal to the preset time, determine the relationship between the current pressure and the set pressure. If the difference between the set pressure and the current pressure is greater than or equal to the differential pressure constant, the rapid pressurization pathway is controlled to perform a rapid pressurization operation on the spare tank; and / or If the difference between the set pressure and the current pressure is less than or equal to a negative number of the differential pressure constant, the pressure relief passage is controlled to perform a pressure relief operation on the spare tank. Wherein, the preset time and the differential pressure constant are constants greater than zero.

8. A control system for a blast furnace pulverized coal injection system, characterized in that, include: The first obtaining unit is used to obtain the remaining injection time of the working tank. The second obtaining unit is used to obtain the set pressure of the backup tank and detect the current pressure of the backup tank; The calculation unit is used to obtain the gas flow rate based on the remaining injection time, the set pressure, and the current pressure; A control unit is used to control the gas inflow rate of the spare tank based on the gas flow rate.

9. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the control method as described in any one of claims 1 to 7.

10. A blast furnace pulverized coal injection system, characterized in that, The blast furnace pulverized coal injection system implements the steps of the control method as described in any one of claims 1 to 7.

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