An automatic pneumatic conveying and pressure regulating method for coking dedusting ash

Abstract

The application discloses an automatic pneumatic conveying and pressure regulation method for coking dedusting ash, and relates to the field of coking dedusting ash treatment; the method adopts the mode that multiple conveying tanks work alternately, ensures that one tank is in a preparation or pressure charging state and the other tank performs conveying operation at any time, thereby guaranteeing the continuity and stability of the system. Secondly, the conveying amount of the coking dedusting ash per hour is calculated, and the corresponding tank pressure target value of each conveying tank is set based on the conveying amount, so that the whole conveying process can not only adapt to the change of production demand, but also maintain stable pressure control. Furthermore, nitrogen is used as the fluidizing medium, which not only effectively avoids the material blockage problem, but also improves the conveying efficiency and safety. In addition, a powder regulating valve and a pneumatic regulating valve and other components are arranged, the valve opening is dynamically adjusted according to the real-time conveying rate, and the accurate control of the flow and the stable maintenance of the pressure in the conveying process are ensured.

Description

Technical Field

[0001] This invention relates to the field of coking dust treatment, and more particularly to an automated pneumatic conveying and pressure control method for coking dust. Background Technology

[0002] Dry quenching dust is a waste generated in the coking industry under the requirements of environmental protection, energy conservation, and clean production. It mainly originates from the suspended solids in dry quenching flue gas collected by bag filters in dry quenching dust collection devices. After adopting the dry quenching process, some of the dust can be reused in sintering batching or power plants. Considering the similarity between dry quenching dust and pulverized coal, using it as part of the blast furnace pulverized coal injection is a feasible reuse method. However, according to the ultra-low emission requirements of steel enterprises, pneumatic conveying should be used during the transfer of dry quenching dust to reduce environmental pollution and improve work efficiency. Although existing technologies provide a method for reusing carbonaceous dust, in actual operation, data such as dust output, blast furnace pulverized coal consumption, and mill hourly pulverizing capacity change daily. How to effectively integrate these dynamic data to ensure balanced dust consumption and uniform mixing with raw coal has become an urgent problem to be solved.

[0003] To ensure the stability of blast furnace production, a method must be found to integrate these constantly changing data, enabling the efficient and stable utilization of dry quenching dust during blast furnace pulverized coal injection. This requires not only precise control of the dust addition ratio but also ensuring its uniform mixing with raw coal to produce pulverized coal with stable composition, providing solid support for stable blast furnace production. Summary of the Invention

[0004] To enable the efficient and stable utilization of dry quenching coke dust in the blast furnace pulverized coal injection process, this invention proposes an automated pneumatic conveying and pressure control method for coking dust, applied to a pressure control system. This system includes: a dust ash silo, multiple conveying tanks, an inlet valve DN100 located at the inlet of the pulverizing system, and pressure relief valves DN80 corresponding to each conveying tank, a regulating module, and a pulverizing valve module. Each conveying tank is connected to the dust ash silo via a corresponding pulverizing valve module. One end of the pressure relief valve DN80 is connected to the inlet of the corresponding conveying tank, and the other end is connected to the dust ash silo.

[0005] The regulating module includes: a pressurizing unit, a conveying valve DN65, a powder regulating valve DN65, and a pneumatic regulating valve DN40; one end of the pressurizing unit is connected to nitrogen gas, and the other end is connected to the inlet end of the conveying tank; one end of the conveying valve DN65 is connected to the outlet end of the conveying tank, and the other end is connected to one end of the powder regulating valve DN65; the other end of the powder regulating valve DN65 is connected to one end of the inlet valve DN100; the other end of the inlet valve DN100 is connected to the inlet end of the pulverizing system; one end of the pneumatic regulating valve DN40 is connected to the outlet end of the conveying tank, and the other end is connected to nitrogen gas; the method includes:

[0006] Based on the average daily processing capacity of coking dust, the target input of the blast furnace injection system per hour, and the output of the pulverizing system per hour, the hourly conveying capacity of coking dust is calculated; based on the hourly conveying capacity of coking dust, the target pressure value of each conveying tank is calculated and set, and the venting setting value and the weight threshold corresponding to the full load and empty load states of the tank are also set.

[0007] When the current conveying tank is ready to be loaded with dust, close the conveying valve DN65 and open the pressure relief valve DN80 to reduce the pressure inside the tank to the release set value; then open the powder loading valve module to allow the dust to enter the current tank; after the current tank reaches the weight threshold corresponding to the full load state, close the powder loading valve module; close the pressure relief valve DN80 and open the pneumatic regulating valve DN40 and the pressurization unit to pressurize the current tank; after the pressure reaches the tank pressure target value, close the pressurization unit and maintain the pressure.

[0008] When the pulverizing system issues a conveying request, the inlet valve DN100, conveying valve DN65, and powder regulating valve DN65 are opened to start conveying dust to the pulverizing system. If the pressure inside the tank is lower than the target tank pressure during the conveying process, the pressure is replenished through the pressurization unit, and the opening of the powder regulating valve DN65 is adjusted according to the change in conveying rate to maintain a stable conveying volume.

[0009] When the weight of the dust in the current tank equals the weight threshold corresponding to the no-load state, the loading, pressurizing and conveying process of the next conveying tank is started, and the conveying operation of the current tank is stopped. When the current tank enters the depressurization stage, the conveying valve DN65, the pneumatic regulating valve DN40 and the pressurizing unit are closed in sequence, and then the depressurization valve DN80 is opened to prepare for the next powder loading process.

[0010] Furthermore, the calculation formula used to determine the hourly coking dust conveying capacity based on the average daily processing capacity of coking dust, the hourly target input of the blast furnace injection system, and the hourly output of the pulverizing system is as follows:

[0011] Q′=k*Q CD *C mill / (24*Q unj );

[0012] Q = Q′·R;

[0013] In the formula, k represents the system margin coefficient (with a value of 1.1); Q CD Indicates the average daily processing volume over the most recent preset days; Q inj This indicates the target input per hour for the blast furnace injection system; C mill Q' represents the hourly output of the pulverizing system; Q′ represents the maximum theoretical hourly conveying capacity of coking dust; Q represents the actual hourly conveying capacity of coking dust; R represents the mass ratio of coking dust to raw coal; 24 represents 24 hours; the pulverizing system is used to convey pulverized coal to the blast furnace injection system.

[0014] Furthermore, the pressure control system also includes a pipe reducer installed between the powder regulating valve DN65 and the inlet valve DN100; wherein: the pipe between the powder regulating valve DN65 and the pipe reducer is the first pipe, and the pipe between the pipe reducer and the inlet valve DN100 is the second pipe; the diameter of the first pipe is smaller than the diameter of the second pipe;

[0015] The calculation and setting of the target tank pressure value for each conveying tank based on the hourly conveying volume of coking dust is as follows:

[0016] Convert the hourly coking dust conveying rate Q into an instantaneous conveying rate.

[0017] Based on instantaneous delivery rate Calculate the flow velocity v1 of coking dust in the first pipe and the flow velocity v2 of coking dust in the second pipe, based on the diameters of the first and second pipes.

[0018] Estimate the pipe resistance loss ΔP of the first pipe based on the flow velocity v1 of the coking dust in the first pipe, the density of the coking dust, and the physical parameters of the first pipe. loss1 ;

[0019] Estimate the pipe resistance loss ΔP of the second pipe based on the flow velocity v2 of the coking dust in the second pipe, the density of the coking dust, and the physical parameters of the second pipe. loss2 ;

[0020] The target tank pressure is calculated using the pipe resistance loss between the first and second pipes and the preset safety margin. The calculation formula is as follows:

[0021] P target =ΔP loss1 +ΔP loss2 +P margin ;

[0022] In the formula, P marginP represents the preset safety margin. target This indicates the target tank pressure value.

[0023] Furthermore, the pipe resistance loss ΔP of the first pipe loss1 The estimation formula is:

[0024] In the formula, f represents the friction factor, L1 represents the length of the first pipe, D1 represents the diameter of the first pipe, and ρ represents the density of the coking dust.

[0025] The pipe resistance loss ΔP of the second pipe loss2 The estimation formula is:

[0026] In the formula, L2 represents the length of the second pipe; D2 represents the diameter of the second pipe.

[0027] Furthermore, the pressure control system also includes a powder flow meter FL3 installed between the powder regulating valve DN65 and the inlet valve DN100, for obtaining the real-time conveying rate.

[0028] The method of adjusting the opening of the powder regulating valve according to changes in the conveying rate to maintain a stable conveying volume specifically includes:

[0029] Determine the real-time delivery rate Is it greater than the instantaneous delivery rate? If so, the opening adjustment value is calculated using the first adjustment formula, and the opening of the powder regulating valve is reduced to that opening adjustment value;

[0030] Determine the real-time delivery rate Is it less than the instantaneous delivery rate? If so, the opening adjustment value is calculated using the second adjustment formula, and the opening of the powder regulating valve is increased to that opening adjustment value.

[0031] Furthermore, the expression for the first adjustment formula is:

[0032]

[0033] The expression for the second adjustment formula is:

[0034]

[0035] In the formula, A current K represents the current opening degree of the powder control valve. P A represents the proportional control gain coefficient; valve This indicates the opening adjustment value.

[0036] Furthermore, the adjustment module also includes:

[0037] A nitrogen gas supply device located between the powder regulating valve DN65 and the inlet valve DN100 and close to the output end of the powder regulating valve DN65.

[0038] A DN25 blowing gas regulating valve is connected to nitrogen at one end and to a nitrogen replenisher at the other end.

[0039] The pressure control system also includes: a pressure measuring component BP7 installed at the output end of the nitrogen replenisher;

[0040] Pressure measuring component BP9 is installed at the inlet of the pulverizing system;

[0041] The method further includes:

[0042] During the conveying process, the real-time pressure difference between the pipeline from the nitrogen replenisher output to the pulverizing system inlet is calculated using the detection data from pressure measuring components BP7 and BP9. When the real-time pressure difference exceeds a set threshold and persists for more than a preset duration, the following operations are performed:

[0043] Close the delivery valve DN65 and fully open the purging air regulating valve DN25 to enter the purging state to clear blockages in the pipeline; trigger the HMI alarm, and if it does not automatically recover, perform an emergency stop operation to ensure system safety.

[0044] Further, the powder loading valve module includes: an upper powder loading valve DN250 and a lower powder loading valve DN250; the powder loading valve module is then opened to allow dust to enter the current tank; after the current tank reaches the weight threshold corresponding to the full load state, the powder loading valve module is closed, specifically as follows:

[0045] Upon entering the powder loading stage, the lower powder loading valve DN250 is opened first, followed by the upper powder loading valve DN250 to begin loading. When the current tank reaches the weight threshold corresponding to the full load state, the upper powder loading valve DN250 is closed first, and the lower powder loading valve DN250 is closed after a 10-second delay. Then, the pressurization stage begins.

[0046] Furthermore, the pressurization unit includes: a pressurization valve DN40 and a pressure replenishment valve DN25;

[0047] The process involves closing the pressure relief valve DN80, opening the pneumatic regulating valve DN40 and the pressurizing unit to pressurize the current tank, and then closing the pressurizing unit and maintaining the pressure once the target tank pressure is reached. Specifically:

[0048] Close the pressure relief valve DN80, and open the pneumatic regulating valve DN40 and the pressure charging valve DN40 to pressurize the current tank. After the pressure reaches the target tank pressure value, close the pressure charging valve DN40, and perform a pressure holding operation before the pulverizing system issues a conveying request.

[0049] When the tank pressure is lower than (P) target When the pressure is below -10 kPa, open the pressure-repairing valve DN25 to provide pressure; when the tank pressure is above (P... target When the pressure reaches +10kPa, close the pressure compensation valve DN25 to stop pressure compensation.

[0050] Furthermore, if the pressure inside the tank is lower than the target tank pressure during the conveying process, the pressure is replenished through a pressurization unit, specifically as follows:

[0051] When the tank pressure is 30 kPa lower than the target tank pressure value, open the pressure charging valve DN40 for rapid pressure replenishment; when the tank pressure rises back to 20 kPa lower than the target tank pressure value, close the pressure charging valve DN40, and then continue to perform fine pressure regulation and pressure replenishment through the pressure replenishment valve DN25 to maintain stable tank pressure.

[0052] Compared with the prior art, the present invention has at least the following beneficial effects:

[0053] (1) This invention provides an automated pneumatic conveying and pressure control method for coking dust. First, multiple conveying tanks are used alternately to ensure that at any given time, one tank is in a ready or pressurized state while another tank is conveying, thus ensuring the continuity and stability of the system. Second, by calculating the hourly conveying volume of coking dust, and setting the corresponding tank pressure target value for each conveying tank, as well as setting the venting set value and the weight threshold for full-load and empty-load states, the entire conveying process can adapt to changes in production needs while maintaining stable pressure control. Furthermore, using nitrogen as a fluidizing medium not only effectively avoids material blockage but also improves conveying efficiency and safety. In addition, components such as powder regulating valves and pneumatic regulating valves are set up to dynamically adjust the valve opening according to the real-time conveying rate, ensuring precise flow control and stable pressure maintenance during the conveying process. Finally, through automated depressurization, powder loading, pressurization, and conveying processes, the need for manual intervention is significantly reduced, labor intensity is lowered, and overall work efficiency and system reliability are improved.

[0054] (2) This invention achieves a smooth transition from the first pipe to the second pipe by setting a pipe reducer between the powder regulating valve DN65 and the inlet valve DN100, maintaining the flow rate while optimizing pressure loss. Specifically, this invention calculates the flow rate and corresponding resistance loss of coking dust in the two pipe sections based on their different diameters. This detailed analysis and calculation can more accurately predict the pressure requirements of the entire system and set a reasonable target tank pressure value accordingly. In this way, not only is stable material conveying under different pipe diameters ensured, but also the problem of poor conveying caused by insufficient or excessive local pressure is effectively avoided, thereby improving the overall efficiency and stability of the system, while optimizing energy management and reducing unnecessary energy consumption. This method significantly enhances the controllability and safety of the system, providing a solid guarantee for the stable operation of the blast furnace injection system.

[0055] (3) This invention achieves precise control of the coking dust conveying process by introducing a powder flow meter to monitor the conveying rate in real time and dynamically adjusting the opening of the powder regulating valve according to changes in the conveying rate. Specifically, when the system detects that the real-time conveying rate is inconsistent with the set instantaneous conveying rate, it can calculate an appropriate opening adjustment value through a first adjustment formula or a second adjustment formula, automatically adjusting the opening of the powder regulating valve to ensure stable conveying volume. This method not only maintains the consistency of material flow rate but also significantly improves the system's response speed and adjustment accuracy. In addition, through this meticulous dynamic adjustment mechanism, the instability of conveying caused by pressure fluctuations or flow rate changes can be effectively avoided, thereby optimizing the operating efficiency and stability of the entire pneumatic conveying system. Ultimately, these improvements provide a more uniform and stable coal powder composition for the blast furnace injection system, ensuring the continuity and efficiency of coking production, while also improving the system's reliability and environmental performance.

[0056] (4) This invention achieves precise control and stable maintenance of the pressure inside the coking dust conveying tank by optimizing the operation logic of the pressurizing unit. Specifically, when the pressure inside the tank is 30 kPa lower than the target pressure value, the system opens the pressurizing valve DN40 for rapid pressure replenishment; when the pressure rises back to 20 kPa lower than the target pressure value, the pressurizing valve DN40 is closed, and fine pressure adjustment and replenishment are continued through the pressure replenishment valve DN25 to ensure that the pressure inside the tank is always kept within the optimal range. In addition, the system automatically performs a pressure holding operation before the pulverizing system issues a conveying request, further ensuring the stability during the conveying process. This design not only improves the system's response speed and adjustment accuracy, but also effectively avoids conveying problems or interruptions caused by pressure fluctuations. By dynamically adjusting the opening and closing of the pressurizing valve and the pressure replenishment valve, the pressure inside the tank is kept stable, improving the reliability and efficiency of the entire system. Ultimately, these improvements ensured that coking dust could be mixed evenly and stably with raw coal, providing high-quality pulverized coal for the blast furnace injection system, supporting the continuity and efficiency of coking production, and also meeting the requirements of energy conservation, emission reduction and environmentally friendly production. Attached Figure Description

[0057] Figure 1 This is a structural diagram of the pressure control system in an embodiment of the present invention;

[0058] Figure 2 This is a structural diagram of the powder-making system in an embodiment of the present invention. Detailed Implementation

[0059] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0060] To enable the efficient and stable utilization of dry quenching ash in the blast furnace pulverized coal injection process, this invention proposes an automated pneumatic conveying and pressure control method for coking ash, applicable to, for example... Figure 1 The pressure control system shown includes: a dust collection silo, multiple conveying tanks, an inlet valve DN100 installed at the inlet of the pulverizing system, and a pressure relief valve DN80 corresponding to each conveying tank, a regulating module, and a powder loading valve module; each conveying tank is connected to the dust collection silo through a corresponding powder loading valve module; one end of the pressure relief valve DN80 is connected to the inlet of the corresponding conveying tank, and the other end is connected to the dust collection silo.

[0061] Tanker trucks transport the dry quenching coke dust to the dust collection room, where it undergoes preliminary treatment via filters installed on the dust collection pipeline. This effectively separates larger particles of impurities, ensuring the dust meets the requirements for pneumatic conveying. The filtered, qualified dust is collected by filter bags and falls into a buffer ash silo, while the remaining gas is discharged through a dust collector on the silo top. This process ensures the quality of the dust entering subsequent systems, providing a foundation for stable operation and preparing for further automated pneumatic conveying and pressure control. This not only ensures the purity of the dust but also maintains a clean and safe working environment.

[0062] The regulating module includes: a pressurizing unit, a conveying valve DN65, a powder regulating valve DN65, and a pneumatic regulating valve DN40; one end of the pressurizing unit is connected to nitrogen gas, and the other end is connected to the inlet end of the conveying tank; one end of the conveying valve DN65 is connected to the outlet end of the conveying tank, and the other end is connected to one end of the powder regulating valve DN65; the other end of the powder regulating valve DN65 is connected to one end of the inlet valve DN100; the other end of the inlet valve DN100 is connected to... Figure 2 The inlet end of the pulverizing system shown is connected; one end of the pneumatic regulating valve DN40 is connected to the outlet end of the conveying tank, and the other end is connected to nitrogen;

[0063] It should be noted that, Figure 1 The pressure control system shown includes:

[0064] 1. Two conveying tanks (Conveying Tank A and Conveying Tank B) are used for alternating operation. (A pneumatic ball valve is installed between the two conveying tanks to achieve system flexibility, safety, and efficient operation. Through valve control, each conveying tank can independently perform powder loading, pressurization, and conveying operations, ensuring that one tank performing a specific task does not affect the operation of the other, thus supporting a continuous and stable material supply. Furthermore, the valve effectively isolates the pressure between different tanks, preventing safety issues caused by pressure cross-contamination. In case of maintenance or abnormalities, a tank can be easily isolated from the system without affecting the normal operation of the overall system. This design not only improves system reliability and safety but also facilitates process management and emergency handling.)

[0065] 2. Multiple manual valves, specifically:

[0066] 2.1 Manual butterfly valve DN250 belonging to the powder filling valve module.

[0067] 2.2 A manual shut-off valve belonging to the regulating module and located between the nitrogen replenisher output and the pressure measuring component BP7. In this embodiment, all manual valves are normally open.

[0068] 2.3 The manual valve corresponding to the pressurization unit (its function is equivalent to that of the pressurization unit).

[0069] 2.4 Manual valve corresponding to pneumatic control valve DN40 (its function is equivalent to pneumatic control valve DN40).

[0070] 2.5 The manual valve corresponding to the DN25 blow-aid regulating valve (specifically an electric regulating valve) (its function is equivalent to that of the DN25 blow-aid regulating valve).

[0071] 2.6 Manual valve corresponding to fluidizing valve DN50 (its function is equivalent to that of fluidizing valve DN50).

[0072] Figure 1 In the diagram, BW1 and BW2 represent weight monitoring points, BP1 and BP2 represent pressure monitoring points, BT5 and BT6 represent temperature monitoring points, and FW1, FW2, FW6, and FW8 represent material level monitoring points; M1 and M2 represent ash hoppers.

[0073] 3. Fluidizing valve DN50 belonging to the regulating module (equipped with one manual valve):

[0074] The main function of the DN50 fluidizing valve is to inject nitrogen gas into the conveying tank to fluidize the dust, thereby ensuring smooth flow of the dust and guaranteeing the stability of the conveying process. This valve is typically in the open state under the following conditions during operation:

[0075] Pressurization stage: When the conveying tank needs to be pressurized, the fluidizing valve DN50 will open to inject gas into the tank, causing the dust particles to suspend and form a fluidized state, which facilitates subsequent conveying operations.

[0076] During the conveying process: In the actual conveying of coking dust, the fluidizing valve DN50 remains open to continuously provide auxiliary blowing air in order to maintain the fluidization of the dust and ensure that the material can pass through the pipeline smoothly and avoid blockage problems.

[0077] In this way, the DN50 fluidizing valve ensures that the dust collected in the conveying tank maintains good flowability throughout the conveying process, thereby achieving stable and efficient material transport. This design not only improves system reliability but also reduces operational interruptions caused by material accumulation or blockage.

[0078] 4. Anti-blocking valve DN40, one end of which is connected to each manual shut-off valve, and the other end is connected to nitrogen.

[0079] The DN40 anti-blocking valve is normally kept closed, primarily depressurizing via the coal feeder. However, if the depressurization path at the coal feeder is obstructed or blocked, depressurization can also be achieved from the conveying tank. This dual depressurization mechanism ensures that the system can effectively release pressure and maintain its safety and stability even in the event of blockages or other abnormal conditions. In this way, the DN40 anti-blocking valve can provide an additional depressurization path when necessary, preventing equipment damage or production interruption due to excessive pressure.

[0080] Figure 1 middle:

[0081] 1. The function of the DN80 pressure relief valve is to release the pressure inside the conveying tank into the dust collection silo after the material conveying process is completed. Since the medium discharged during the pressure relief process contains a mixture of dust and gas, the dust needs to be recycled, and the dust collection silo has this recycling function. In this way, the DN80 pressure relief valve not only safely reduces the pressure inside the conveying tank but also ensures that dust is not directly emitted into the environment, achieving material recycling under environmental protection requirements. After this process, the conveying tank can be refilled with new dust collection silo, preparing for the next round of conveying operations. This process ensures the continuity and stability of the system while also complying with environmental standards.

[0082] 2. The dual design of an upper and lower DN250 powder loading valve is primarily to meet the high-precision requirements of weighing in the conveying tank. If only a single powder loading valve is used, issues such as incomplete valve closure may occur during conveying, leading to a connection between the conveying tank and the dust collection hopper, thus affecting weighing accuracy. This dual-valve design also effectively prevents dust leakage, improving the system's reliability and stability.

[0083] 3. The primary function of the nitrogen supplementer is not to directly replenish the conveying tank, but rather to transport coking dust through an intermediate channel while introducing nitrogen from the side. This equipment utilizes the ejector effect of the fluidizing gas (nitrogen) to smoothly draw the dust out of the conveying tank, thus promoting its smooth transport. Specifically, the nitrogen supplementer injects an appropriate amount of nitrogen into the material flow, suspending and fluidizing the dust particles, ensuring stable material flow within the pipeline, reducing the risk of blockage, and improving the efficiency and reliability of the entire pneumatic conveying system. Therefore, the main function of the nitrogen supplementer is to enhance the smoothness and stability of material transport, rather than simply being a gas replenishment device.

[0084] 4. The opening of the DN25 purging air regulating valve is usually set to a fixed value to maintain normal delivery operation. However, in the event of a pipe blockage, the regulating valve will automatically open fully to provide a larger airflow for powerful purging, quickly clearing the blockage and restoring the system to normal operation. This design ensures stability and efficiency during normal operation while effectively responding to sudden blockages.

[0085] Figure 1 The serrated lines in the image represent rubber hoses.

[0086] Figure 2 The pulverizing system includes a raw coal bunker, coal feeder, riser pipe, and medium-speed mill. The pulverizing system is used to prepare the pulverized coal required by the blast furnace. Specifically:

[0087] Medium-speed mill: This is a device used to grind raw coal into fine powder. It uses the relative movement between internal grinding rollers and a grinding disc to grind the raw coal into a certain particle size. The ground coal powder is then carried out of the mill along with the hot flue gas.

[0088] Ascend pipe: Connected to the outlet of the medium-speed mill, its main function is to convey the ground pulverized coal and hot flue gas upwards to the subsequent separator or combustion chamber. The design of the ascender pipe helps to utilize the kinetic energy of the hot flue gas, enabling the pulverized coal to be smoothly transported to the next stage.

[0089] The method includes:

[0090] Based on the average daily processing capacity of coking dust, the target input of the blast furnace injection system per hour, and the output of the pulverizing system per hour, the hourly conveying capacity of coking dust is calculated; based on the hourly conveying capacity of coking dust, the target pressure value of each conveying tank is calculated and set, and the venting setting value and the weight threshold corresponding to the full load and empty load states of the tank are also set.

[0091] The method for calculating the hourly coking dust conveying capacity based on the average daily processing capacity of coking dust, the hourly target input of the blast furnace injection system, and the hourly output of the pulverizing system is as follows:

[0092] Q′=k*Q CD *C mill / (24*Q inj );

[0093] Q = Q′·R;

[0094] In the formula, k represents the system margin coefficient (with a value of 1.1); Q CD Indicates the average daily processing volume over the most recent preset days; Q inj This indicates the target input per hour for the blast furnace injection system; C millQ' represents the hourly output of the pulverizing system; Q′ represents the maximum theoretical hourly conveying capacity of coking dust; Q represents the actual hourly conveying capacity of coking dust; R represents the mass ratio of coking dust to raw coal; 24 represents 24 hours; the pulverizing system is used to convey pulverized coal to the blast furnace injection system.

[0095] The target input per hour for the blast furnace injection system refers to the amount of pulverized coal that needs to be injected into the blast furnace per hour. This is a target value set based on the blast furnace's production needs.

[0096] Pulverizing system output per hour: refers to the actual amount of pulverized coal that the pulverizing system (the system responsible for providing and processing pulverized coal) can output.

[0097] Under normal circumstances, the output of the pulverizing system should meet the needs of the blast furnace injection system; that is, the output of the pulverizing system is intended to supply the blast furnace injection system. Therefore, ideally, the hourly output of the pulverizing system should match the hourly target input of the blast furnace injection system to ensure the continuity and stability of blast furnace production.

[0098] The pressure control system also includes a pipe reducer installed between the powder regulating valve DN65 and the inlet valve DN100; wherein: the pipe between the powder regulating valve DN65 and the pipe reducer is the first pipe, and the pipe between the pipe reducer and the inlet valve DN100 is the second pipe; the diameter of the first pipe is smaller than the diameter of the second pipe;

[0099] The calculation and setting of the target tank pressure value for each conveying tank based on the hourly conveying volume of coking dust is as follows:

[0100] Convert the hourly coking dust conveying rate Q into an instantaneous conveying rate. The conversion formula is:

[0101]

[0102] Instantaneous delivery rate This refers to the system's conveying rate at a specific moment, measured in tons per hour. Although termed "instantaneous," in industrial applications it typically refers to the average rate over that time period.

[0103] Hourly conveying capacity Q: and instantaneous conveying rate They are the same, both using "tons per hour" as the unit, indicating the amount of material the system can transport in one hour.

[0104] Based on instantaneous delivery rate Given the diameters d1 and D2 of the first and second pipes, calculate the flow velocities v1 and v2 of the coking dust in the first and second pipes, respectively; the calculation formula is:

[0105] in:

[0106] in:

[0107] In the formula, A1 represents the cross-sectional area of ​​the first pipe and A2 represents the cross-sectional area of ​​the second pipe.

[0108] Estimate the pipe resistance loss ΔP of the first pipe based on the flow velocity v1 of the coking dust in the first pipe, the density of the coking dust, and the physical parameters of the first pipe. loss1 ;

[0109] Estimate the pipe resistance loss ΔP of the second pipe based on the flow velocity v2 of the coking dust in the second pipe, the density of the coking dust, and the physical parameters of the second pipe. loss2 ;

[0110] The target tank pressure is calculated using the pipe resistance loss between the first and second pipes and the preset safety margin. The calculation formula is as follows:

[0111] P target =ΔP loss1 +ΔP loss2 +P margin ;

[0112] In the formula, P margin P represents the preset safety margin. target This indicates the target tank pressure value.

[0113] The pipe resistance loss ΔP of the first pipe loss1 The estimation formula is:

[0114] In the formula, f represents the friction factor, L1 represents the length of the first pipe, D1 represents the diameter of the first pipe, and ρ represents the density of the coking dust.

[0115] The pipe resistance loss ΔP of the second pipe loss2 The estimation formula is:

[0116] In the formula, L2 represents the length of the second pipe; D2 represents the diameter of the second pipe.

[0117] This invention achieves a smooth transition from the first to the second pipeline by installing a pipe reducer between the DN65 powder regulating valve and the DN100 inlet valve, maintaining flow velocity while optimizing pressure loss. Specifically, this invention calculates the flow velocity and corresponding resistance loss of coking dust in the two pipeline sections based on their different diameters. This detailed analysis and calculation allows for a more accurate prediction of the overall system pressure requirements, enabling the setting of reasonable tank pressure target values. This approach not only ensures stable material transport under different pipe diameters but also effectively avoids transport obstructions caused by insufficient or excessive local pressure, thereby improving the overall system efficiency and stability. It also optimizes energy management and reduces unnecessary energy consumption. This method significantly enhances the system's controllability and safety, providing a solid guarantee for the stable operation of the blast furnace injection system.

[0118] When the current conveying tank is ready to be loaded with dust, close the conveying valve DN65 and open the pressure relief valve DN80 to reduce the pressure inside the tank to the release set value (atmospheric pressure level); then open the powder loading valve module to allow the dust to enter the current tank; after the current tank reaches the weight threshold corresponding to the full load state, close the powder loading valve module; close the pressure relief valve DN80 and open the pneumatic regulating valve DN40 and the pressurization unit to pressurize the current tank; after the pressure reaches the tank pressure target value, close the pressurization unit and maintain the pressure.

[0119] The DN40 pneumatic control valve is primarily used to purge pipelines before conveying, ensuring they are clean and unobstructed. It also assists in the conveying process by providing additional airflow to guarantee smooth material flow. This operational procedure ensures efficient and stable system operation, preventing blockages or other conveying problems caused by residual material. Precise control of the valve's opening and closing timing effectively improves the reliability and efficiency of the entire pneumatic conveying system. Furthermore, the DN40 pneumatic control valve is typically maintained at a specific opening to ensure a continuous supply of appropriate fluidizing gas, maintaining the fluidized state of the material and thus guaranteeing the stability and smoothness of the conveying process.

[0120] The powder loading valve module includes: an upper powder loading valve DN250 and a lower powder loading valve DN250;

[0121] The process involves subsequently opening the powder loading valve module to allow dust to enter the current tank; once the current tank reaches the weight threshold corresponding to full load, the powder loading valve module is closed, specifically as follows:

[0122] Upon entering the powder loading stage, the lower powder loading valve DN250 is opened first, followed by the upper powder loading valve DN250 to begin loading. When the current tank reaches the weight threshold corresponding to the full load state, the upper powder loading valve DN250 is closed first, and the lower powder loading valve DN250 is closed after a 10-second delay. Then, the pressurization stage begins.

[0123] The pressurization unit includes: a pressurization valve DN40 and a pressure replenishment valve DN25;

[0124] The process involves closing the pressure relief valve DN80, opening the pneumatic regulating valve DN40 and the pressurizing unit to pressurize the current tank, and then closing the pressurizing unit and maintaining the pressure once the target tank pressure is reached. Specifically:

[0125] Close the pressure relief valve DN80, and open the pneumatic regulating valve DN40 and the pressure charging valve DN40 to pressurize the current tank. After the pressure reaches the target tank pressure value, close the pressure charging valve DN40, and perform a pressure holding operation before the pulverizing system issues a conveying request.

[0126] When the tank pressure is lower than (P) target When the pressure is below -10 kPa, open the pressure-repairing valve DN25 to provide pressure; when the tank pressure is above (P... target When the pressure reaches +10kPa, close the pressure compensation valve DN25 to stop pressure compensation.

[0127] When the pulverizing system issues a conveying request, the inlet valve DN100, conveying valve DN65, and powder regulating valve DN65 are opened to start conveying dust to the pulverizing system. If the pressure inside the tank is lower than the target tank pressure during the conveying process, the pressure is replenished through the pressurization unit, and the opening of the powder regulating valve DN65 is adjusted according to the change in conveying rate to maintain a stable conveying volume.

[0128] If the pressure inside the tank is lower than the target pressure value during the conveying process, the pressure is replenished through the pressurization unit, specifically as follows:

[0129] When the tank pressure is 30 kPa lower than the target tank pressure value, open the pressure charging valve DN40 for rapid pressure replenishment; when the tank pressure rises back to 20 kPa lower than the target tank pressure value, close the pressure charging valve DN40, and then continue to perform fine pressure regulation and pressure replenishment through the pressure replenishment valve DN25 to maintain stable tank pressure.

[0130] This invention achieves precise control and stable maintenance of the pressure inside the coking dust conveying tank by optimizing the operating logic of the pressurizing unit. Specifically, when the tank pressure is 30 kPa lower than the target pressure value, the system opens the pressurizing valve DN40 for rapid pressure replenishment; when the tank pressure rises back to 20 kPa below the target pressure value, the pressurizing valve DN40 closes, and fine pressure adjustment and replenishment continue through the pressure replenishment valve DN25 to ensure that the tank pressure is always maintained within the optimal range. Furthermore, before the pulverizing system issues a conveying request, the system automatically performs a pressure-holding operation, further ensuring stability during the conveying process. This design not only improves the system's response speed and adjustment accuracy but also effectively avoids conveying disruptions or interruptions caused by pressure fluctuations. By dynamically adjusting the opening and closing of the pressurizing valve and the pressure replenishment valve, the tank pressure is continuously stabilized, improving the reliability and efficiency of the entire system. Ultimately, these improvements ensured that coking dust could be mixed evenly and stably with raw coal, providing high-quality pulverized coal for the blast furnace injection system, supporting the continuity and efficiency of coking production, and also meeting the requirements of energy conservation, emission reduction and environmentally friendly production.

[0131] The pressure control system also includes a powder flow meter FL3 installed between the powder regulating valve DN65 and the inlet valve DN100, used to obtain the real-time conveying rate.

[0132] The method of adjusting the opening of the powder regulating valve according to changes in the conveying rate to maintain a stable conveying volume specifically includes:

[0133] Determine the real-time delivery rate Is it greater than the instantaneous delivery rate? If so, the opening adjustment value is calculated using the first adjustment formula, and the opening of the powder regulating valve is reduced to that opening adjustment value;

[0134] Determine the real-time delivery rate Is it less than the instantaneous delivery rate? If so, the opening adjustment value is calculated using the second adjustment formula, and the opening of the powder regulating valve is increased to that opening adjustment value.

[0135] The expression for the first adjustment formula is:

[0136]

[0137] The expression for the second adjustment formula is:

[0138]

[0139] In the formula, A current K represents the current opening degree of the powder control valve. P A represents the proportional control gain coefficient; valveThis indicates the opening adjustment value.

[0140] This invention achieves precise control over the conveying process of coking dust by introducing a powder flow meter to monitor the conveying rate in real time and dynamically adjusting the opening of the powder regulating valve according to changes in the conveying rate. Specifically, when the system detects a discrepancy between the real-time conveying rate and the set instantaneous conveying rate, it can calculate an appropriate opening adjustment value using a first or second adjustment formula, automatically adjusting the opening of the powder regulating valve to ensure stable conveying volume. This method not only maintains the consistency of material flow rate but also significantly improves the system's response speed and adjustment accuracy. Furthermore, this meticulous dynamic adjustment mechanism effectively avoids conveying instability caused by pressure fluctuations or flow rate changes, thereby optimizing the operating efficiency and stability of the entire pneumatic conveying system. Ultimately, these improvements provide a more uniform and stable coal powder composition for the blast furnace injection system, ensuring the continuity and efficiency of coking production while enhancing the system's reliability and environmental performance.

[0141] The adjustment module further includes:

[0142] A nitrogen gas supply device located between the powder regulating valve DN65 and the inlet valve DN100 and close to the output end of the powder regulating valve DN65.

[0143] A DN25 blowing gas regulating valve is connected to nitrogen at one end and to a nitrogen replenisher at the other end.

[0144] The pressure control system also includes: a pressure measuring component BP7 installed at the output end of the nitrogen replenisher;

[0145] Pressure measuring component BP9 is installed at the inlet of the pulverizing system;

[0146] The method further includes:

[0147] During the conveying process, the real-time pressure difference between the pipeline from the nitrogen replenisher output to the pulverizing system inlet is calculated using the detection data from pressure measuring components BP7 and BP9. When the real-time pressure difference exceeds the set threshold of 0.2 MPa and persists for more than a preset duration (10 seconds), the following operations are performed:

[0148] Close the delivery valve DN65 and fully open the purging air regulating valve DN25 to enter the purging state to clear blockages in the pipeline; trigger the HMI alarm, and if it does not automatically recover, perform an emergency stop operation to ensure system safety.

[0149] When the interlock shutdown mechanism of the pulverizing system is triggered, to ensure the safety and stability of the system, all conveying valves, including but not limited to the conveying valve DN65, the fluidizing pneumatic regulating valve DN40, and the inlet valve DN100, are rapidly shut off within 0.5 seconds. This rapid response measure effectively avoids material blockage or abnormal increase in system pressure caused by sudden shutdown, thereby protecting the equipment from damage. "When the interlock shutdown mechanism of the pulverizing system is triggered" refers to the situation where the pulverizing system detects certain abnormalities or faults and automatically initiates the emergency shutdown procedure according to pre-set safety rules. The interlock shutdown mechanism is a safety measure used to quickly stop the operation of relevant equipment in the event of a situation that may endanger equipment, operator safety, or product quality, to prevent the accident from escalating or occurring.

[0150] In addition, a pipeline purging procedure must be performed before restarting the pulverizing system. This involves thoroughly cleaning the entire conveying pipeline using nitrogen or other inert gases by opening the relevant purging valves, ensuring no residual material remains inside the pipeline to prevent potential blockages and guarantee the safety and smooth operation of subsequent processes. This purging step is an indispensable part of each system restart, designed to maintain efficient system operation and ensure compliance with safe production requirements.

[0151] When the weight of the dust in the current tank equals the weight threshold corresponding to the no-load state, the loading, pressurizing and conveying process of the next conveying tank is started, and the conveying operation of the current tank is stopped. When the current tank enters the depressurization stage, the conveying valve DN65, the pneumatic regulating valve DN40 and the pressurizing unit are closed in sequence, and then the depressurization valve DN80 is opened to prepare for the next powder loading process.

[0152] The overall process of this embodiment is as follows:

[0153] Under normal operating conditions, when conveyor tank A is ready to enter the conveying process, first confirm that the conveying valve DN65 is closed and the pressure relief valve DN80 is open. Once the pressure inside the tank drops to the venting set value, sequentially open the lower powder loading valve DN250 and the upper powder loading valve DN250 to allow dust to fall from the buffer ash silo into the conveyor tank. When the tank weight reaches the weight threshold corresponding to the full load state, close the upper powder loading valve DN250 and the lower powder loading valve DN250, then close the pressure relief valve DN80, and open the fluidizing pneumatic regulating valve DN40 and the pressurizing valve DN40 to perform the pressurization operation. When the pressure inside the tank reaches the target tank pressure value, close the pressurizing valve DN40 to complete the pressurization process, and the conveyor tank enters the ready-to-convey state. When the pulverizing system issues a powder demand signal, first open the inlet valve DN100, then sequentially open the conveying valve DN65 and the powder regulating valve DN65 to begin conveying dust to the pulverizing system.

[0154] During the conveying process, if the pressure inside the tank is lower than the target pressure value, the pressurization unit will automatically activate to replenish the pressure and maintain stable tank pressure. If the conveying rate fluctuates, the powder flow rate will be controlled by adjusting the opening of the powder regulating valve DN65 to ensure a constant conveying rate. Simultaneously, conveying tank B will undergo powder loading and pressurization operations, entering a ready-to-convey state. When the weight of tank A drops to the weight threshold corresponding to the empty state, the conveying operation will switch to tank B. This involves sequentially opening the conveying valve DN65 and powder regulating valve DN65 of tank B, while simultaneously closing the conveying valve DN65, fluidizing pneumatic regulating valve DN40, and pressure replenishing valve DN25 of tank A, and opening the pressure relief valve DN80 to depressurize.

[0155] After depressurization, tank A re-enters the powder loading and pressurization process, preparing for the next cycle of conveying. This alternating operation ensures the continuity and stability of dust collection ash conveying. When the pulverizing system stops requiring powder, the conveying valve DN65, fluidizing pneumatic regulating valve DN40, and coal feeder inlet valve DN100 of the current conveying tank are closed, stopping the conveying operation. When the system detects an abnormal increase in tank pressure exceeding the set upper limit, the anti-blocking valve DN40 automatically opens to release pressure and prevent overpressure-induced malfunctions. Throughout the entire process, the powder regulating valve DN65 is generally kept at a certain opening to ensure the smoothness of the conveying process.

[0156] This invention provides an automated pneumatic conveying and pressure control method for coking dust. First, multiple conveying tanks operate alternately, ensuring that at any given time, one tank is in a ready or pressurized state while another is conveying, thus guaranteeing system continuity and stability. Second, by calculating the hourly conveying volume of coking dust and setting target tank pressure values ​​for each conveying tank accordingly, along with venting settings and weight thresholds for full-load and empty states, the entire conveying process can adapt to changes in production demands while maintaining stable pressure control. Third, using nitrogen as a fluidizing medium effectively avoids material blockage and improves conveying efficiency and safety. Furthermore, components such as powder regulating valves and pneumatic regulating valves are incorporated, dynamically adjusting valve openings based on real-time conveying rates to ensure precise flow control and stable pressure maintenance during conveying. Finally, the automated depressurization, powder loading, pressurization, and conveying processes significantly reduce the need for manual intervention, lower labor intensity, and improve overall work efficiency and system reliability.

[0157] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0158] Furthermore, in this invention, descriptions involving terms such as "first," "second," and "a" are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0159] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0160] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

Claims

1. An automated pneumatic conveying and pressure control method for coking dust, characterized in that, It is applied to a pressure control system; the system includes: a dust collection silo, multiple conveying tanks, an inlet valve installed at the inlet end of the pulverizing system, and pressure relief valves, regulating modules and powder loading valve modules corresponding to each conveying tank; each conveying tank is connected to the dust collection silo through a corresponding powder loading valve module; one end of the pressure relief valve is connected to the inlet end of the corresponding conveying tank, and the other end is connected to the dust collection silo. The regulating module includes: a pressurizing unit, a conveying valve, a powder regulating valve, and a pneumatic regulating valve; one end of the pressurizing unit is connected to nitrogen gas, and the other end is connected to the inlet end of the conveying tank; one end of the conveying valve is connected to the outlet end of the conveying tank, and the other end is connected to one end of the powder regulating valve; the other end of the powder regulating valve is connected to one end of the inlet valve; the other end of the inlet valve is connected to the inlet end of the pulverizing system; one end of the pneumatic regulating valve is connected to the outlet end of the conveying tank, and the other end is connected to nitrogen gas. The pressure control system also includes a pipe reducer installed between the powder regulating valve and the inlet valve; wherein: the pipe between the powder regulating valve and the pipe reducer is the first pipe, and the pipe between the pipe reducer and the inlet valve is the second pipe; the diameter of the first pipe is smaller than the diameter of the second pipe; The method includes: The hourly conveying capacity of coking dust is calculated based on the average daily processing capacity of coking dust, the hourly target input of the blast furnace injection system, and the hourly output of the pulverizing system. Based on the hourly conveying capacity of coking dust, the target pressure value for each conveying tank is calculated and set, along with the venting setpoint and weight thresholds corresponding to the full-load and empty-load states of the tanks. The calculation formula used to calculate the hourly conveying capacity of coking dust based on the average daily processing capacity of coking dust, the hourly target input of the blast furnace injection system, and the hourly output of the pulverizing system is as follows: ； ； In the formula, Indicates the system margin coefficient; This indicates the average daily processing volume over the most recent preset days; This indicates the target input per hour for the blast furnace injection system; This indicates the amount of powder produced by the powder-making system per hour. This represents the maximum theoretical conveying capacity of coking dust per hour; This indicates the actual hourly conveying volume of coking dust. This indicates the mass ratio of coking dust to raw coal; This indicates a 24-hour period; the pulverizing system is used to supply pulverized coal to the blast furnace injection system. The calculation and setting of the target tank pressure value for each conveying tank based on the hourly conveying volume of coking dust is as follows: The hourly conveying capacity of coking dust Converted to instantaneous delivery rate ; Based on instantaneous delivery rate Calculate the flow velocity of coking dust in the first pipe, based on the diameters of the first and second pipes. With the flow rate in the second pipe ; Based on the flow velocity of coking dust in the first pipe The density of coking dust, the physical parameters of the first pipeline, and the estimation of pipeline resistance loss of the first pipeline. ; Based on the flow velocity of coking dust in the second pipe The density of coking dust, the physical parameters of the second pipeline, and the estimation of pipeline resistance loss of the second pipeline. ; The target tank pressure is calculated using the pipe resistance loss between the first and second pipes and the preset safety margin. The calculation formula is as follows: ； In the formula, Indicates the preset safety margin. Indicates the target tank pressure value; When the current conveying tank is ready to be loaded with dust, close the conveying valve and open the pressure relief valve to reduce the pressure inside the tank to the release set value; then open the powder loading valve module to allow the dust to enter the current tank; after the current tank reaches the weight threshold corresponding to the full load state, close the powder loading valve module; close the pressure relief valve and open the pneumatic regulating valve and the pressurizing unit to pressurize the current tank; after the pressure reaches the tank pressure target value, close the pressurizing unit and maintain the pressure. When the pulverizing system issues a conveying request, the inlet valve, conveying valve, and powder regulating valve are opened to start conveying dust to the pulverizing system. If the pressure inside the tank is lower than the target tank pressure during the conveying process, the pressure is replenished through the pressurization unit, and the opening of the powder regulating valve is adjusted according to the conveying rate to maintain a stable conveying volume. When the weight of the dust in the current tank equals the weight threshold corresponding to the no-load state, the loading, pressurizing and conveying process of the next conveying tank is started, and the conveying operation of the current tank is stopped. When the current tank enters the depressurization stage, the conveying valve, pneumatic regulating valve and pressurizing unit are closed in sequence, and then the depressurization valve is opened to prepare for the next powder loading process.

2. The automated pneumatic conveying and pressure control method for coking dust as described in claim 1, characterized in that, Pipeline resistance loss of the first pipeline The estimation formula is: In the formula, Indicates the friction factor. Indicates the length of the first pipe; Indicates the diameter of the first pipe; This indicates the density of coking dust. Pipeline resistance loss of the second pipeline The estimation formula is: In the formula, Indicates the length of the second pipe; This indicates the diameter of the second pipe.

3. The automated pneumatic conveying and pressure control method for coking dust as described in claim 2, characterized in that, The pressure control system also includes a powder flow meter installed between the powder regulating valve and the inlet valve to obtain the real-time conveying rate. ; The method of adjusting the opening of the powder regulating valve according to changes in the conveying rate to maintain a stable conveying volume specifically includes: Determine the real-time delivery rate Is it greater than the instantaneous delivery rate? If so, the opening adjustment value is calculated using the first adjustment formula, and the opening of the powder regulating valve is reduced to that opening adjustment value. Determine the real-time delivery rate Is it less than the instantaneous delivery rate? If so, the opening adjustment value is calculated using the second adjustment formula, and the opening of the powder regulating valve is increased to that opening adjustment value.

4. The automated pneumatic conveying and pressure control method for coking dust as described in claim 3, characterized in that, The expression for the first adjustment formula is: ； The expression for the second adjustment formula is: ； In the formula, This indicates the current opening degree of the powder control valve. This represents the proportional control gain coefficient; This indicates the opening adjustment value.

5. The automated pneumatic conveying and pressure control method for coking dust as described in claim 4, characterized in that, The adjustment module further includes: A nitrogen gas replenisher located between the powder regulating valve and the inlet valve, and close to the output end of the powder regulating valve; The blowing gas regulating valve has nitrogen connected to one end and nitrogen replenisher connected to the other end. The pressure control system also includes: a pressure measuring component BP7 installed at the output end of the nitrogen replenisher; Pressure measuring component BP9 is installed at the inlet of the pulverizing system; The method further includes: During the conveying process, the real-time pressure difference between the pipeline from the nitrogen replenisher output to the pulverizing system inlet is calculated using the detection data from pressure measuring components BP7 and BP9. When the real-time pressure difference exceeds a set threshold and persists for more than a preset duration, the following operations are performed: Close the delivery valve and fully open the purging air regulating valve to enter the purging state to clear blockages in the pipeline; trigger the HMI alarm, and if it does not recover automatically, perform an emergency stop operation to ensure system safety.

6. The automated pneumatic conveying and pressure control method for coking dust as described in claim 1, characterized in that, The powder loading valve module includes an upper powder loading valve and a lower powder loading valve; the powder loading valve module is then opened to allow dust to enter the current tank; after the current tank reaches the weight threshold corresponding to the full load state, the powder loading valve module is closed, specifically as follows: Entering the powder loading stage, the lower powder loading valve is opened first, followed by the upper powder loading valve to start loading. When the current tank reaches the weight threshold corresponding to the full load state, the upper powder loading valve is closed first, and the lower powder loading valve is closed after a 10-second delay. Then, the pressurization stage begins.

7. The automated pneumatic conveying and pressure control method for coking dust as described in claim 1, characterized in that, The pressurization unit includes: a pressurization valve and a pressure replenishment valve; The process involves closing the pressure relief valve, opening the pneumatic regulating valve and the pressurizing unit to pressurize the current tank, and then closing the pressurizing unit and maintaining the pressure once the target tank pressure value is reached. Specifically: Close the pressure relief valve and open the pneumatic regulating valve and the pressurizing valve to pressurize the current tank. After the pressure reaches the target tank pressure value, close the pressurizing valve and perform a pressure holding operation before the pulverizing system issues a conveying request. When the tank pressure is lower than ( When the pressure is above ( ), open the pressure-repairing valve to replenish the pressure; when the tank pressure is higher than ( ), When the pressure is released, close the pressure-replenishing valve to stop pressure replenishment.

8. The automated pneumatic conveying and pressure control method for coking dust as described in claim 7, characterized in that, If the pressure inside the tank is lower than the target pressure value during the conveying process, the pressure is replenished through the pressurization unit, specifically as follows: When the tank pressure is lower than the target tank pressure value by 30 When the pressure rises, open the pressurization valve for rapid pressure replenishment; when the tank pressure rises back to 20% below the target tank pressure value... Close the pressurization valve and then continue fine pressure regulation and replenishment through the pressure replenishment valve to maintain stable pressure inside the tank.

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