A blast furnace TRT residual pressure power generation program control method and system

Abstract

The present invention relates to the field of power generation control technology, and discloses a blast furnace TRT residual pressure power generation program control method and system, comprising: opening the blast furnace top material flow valve to distribute the blast furnace, locking the top pressure regulator of the blast furnace TRT system when the distribution reaches a first time period; obtaining the gas volume of the blast furnace when the distribution reaches the first time period, comparing the gas volume with a gas volume threshold, and closing the stator blade opening to a preset angle according to the comparison result; delaying the blast furnace TRT system, unlocking the top pressure regulator when the delay reaches a second time period, and controlling the stator blade opening via the top pressure regulator. The present invention uses feedforward control and an auxiliary program to preemptively intervene in the stator blades by staged overriding PID without affecting the original PID control of the system, thereby improving the power generation of the TRT, and continuously and automatically correcting the intervention angle through feedback control, making the intervention angle more precise.

Description

Technical Field

[0001] The present invention relates to the technical field of power generation control, and in particular to a program-controlled method and system for TRT residual pressure power generation in a large blast furnace. Background Art

[0002] The TRT system is a secondary energy recovery device that utilizes the pressure and thermal energy of coal gas generated during blast furnace smelting. This high-pressure, high-temperature blast furnace gas is converted into electricity by passing it through a residual pressure turbine generator system, which then generates work in a turbine expander. The recovered electricity accounts for approximately 30-40% of the electricity used in blast furnace production. During TRT operation, the clean coal gas, after bag dust removal and metered flow, flows through the TRT inlet butterfly valve, inlet gate valve, and quick-close valve, entering the dry axial flow turbine for expansion and driving its rotation to perform useful work. The gas exiting the turbine passes through the outlet water-sealed butterfly valve and is then piped out. TRT operation and control are achieved by adjusting the TRT stator blade opening using the output of the furnace top pressure regulator (PID) to achieve stable furnace top pressure control.

[0003] Although the existing TRT system does not consume fuel and can replace the pressure reducing valve group in the blast furnace system to regulate and stabilize the furnace top pressure, the blast furnace top pressure will also decrease due to the decrease in gas volume, and the adjustment of the stator blades has a lag, which causes the actual value of the top pressure to deviate downward. This is reflected in the existence of a downward peak in the active power, resulting in a reduction in the active power of the TRT and affecting the power generation of the TRT turbine. The existing TRT system cannot solve this problem. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a large-scale blast furnace TRT residual pressure power generation enhanced program control method and system, through the optimized TRT stator feedforward auxiliary control technology provided by the present invention, the fluctuation peak of active power is reduced and the lower peak is actually shortened, thereby improving the power generation of TRT.

[0005] In a first aspect, an embodiment of the present invention provides a program-controlled method for generating power from TRT residual pressure in a blast furnace, comprising:

[0006] Open the top material flow valve of the blast furnace to distribute the material to the blast furnace. When the material distribution reaches the first time, lock the top pressure regulator of the blast furnace TRT system;

[0007] obtaining in real time the gas volume of the blast furnace burden distribution when the first duration is reached, comparing the gas volume with a gas volume threshold, and closing the stator blade opening to a preset angle according to the comparison result;

[0008] The blast furnace TRT system is subjected to delay control. When the delay reaches a second time length, the furnace top pressure regulator is unlocked, and the stator blade opening is controlled by the furnace top pressure regulator.

[0009] Furthermore, the method further comprises:

[0010] During the blast furnace charging process, the furnace top pressure of the blast furnace is obtained in real time, and the furnace top pressure fluctuation value is obtained by subtracting the furnace top pressure from the top pressure control value;

[0011] After the blast furnace burden is distributed, the furnace top pressure fluctuation value is compared with the fluctuation threshold value, and according to the comparison result, the preset angle is corrected to obtain a corrected preset angle.

[0012] Furthermore, the step of comparing the furnace top pressure fluctuation value with a fluctuation threshold and performing angle correction on the preset angle according to the comparison result includes:

[0013] Comparing the furnace top pressure fluctuation value with a first fluctuation threshold; if the value is greater than the first fluctuation threshold, subtracting the first angle threshold from the preset angle; if the value is less than the first fluctuation threshold, comparing the furnace top pressure fluctuation value with a second fluctuation threshold;

[0014] If it is greater than the second fluctuation threshold, subtracting the second angle threshold from the preset angle; if it is less than the second fluctuation threshold, comparing the furnace top pressure fluctuation value with the third fluctuation threshold;

[0015] If it is greater than the third fluctuation threshold, subtracting the third angle threshold from the preset angle; if it is less than the third fluctuation threshold, comparing the furnace top pressure fluctuation value with the fourth fluctuation threshold;

[0016] If the value is less than the fourth fluctuation threshold, the furnace top pressure fluctuation value is compared with the fifth fluctuation threshold; if the value is greater than the fifth fluctuation threshold, the third angle threshold is added to the preset angle; if the value is less than the fifth fluctuation threshold, the furnace top pressure fluctuation value is compared with the sixth fluctuation threshold;

[0017] If it is greater than the sixth fluctuation threshold, the second angle threshold is added to the preset angle; if it is less than the sixth fluctuation threshold, the first angle threshold is added to the preset angle.

[0018] Furthermore, the corrected preset angle takes effect when the blast furnace performs the next blast furnace charging.

[0019] Furthermore, the step of comparing the gas volume with a gas volume threshold and closing the stator blade opening to a preset angle according to the comparison result includes:

[0020] Comparing the gas volume with a first gas volume threshold; if the gas volume is equal to the first gas volume threshold, closing the stator blade opening by a first preset angle; if the gas volume is less than the first gas volume threshold, comparing the gas volume with a second gas volume threshold;

[0021] If the gas volume is equal to the second gas volume threshold, the stator blade opening is closed by a second preset angle; if the gas volume is less than the second gas volume threshold, the gas volume is compared with a third gas volume threshold;

[0022] If it is equal to the third gas volume threshold, the stator blade opening is closed to a third preset angle.

[0023] In a second aspect, an embodiment of the present invention provides a blast furnace TRT residual pressure power generation program control system, comprising:

[0024] A feedforward control module is used to open the top material flow valve of the blast furnace to distribute the material to the blast furnace, and when the distribution reaches a first time, lock the top pressure regulator of the blast furnace TRT system;

[0025] The auxiliary program control module is used to obtain in real time the amount of gas for blast furnace distribution when the first time period is reached, compare the gas amount with the gas amount threshold, and close the stator opening to a preset angle according to the comparison result; perform delay control on the blast furnace TRT system, and when the delay reaches the second time period, unlock the furnace top pressure regulator and control the stator opening through the furnace top pressure regulator.

[0026] Furthermore, the system further comprises:

[0027] The feedback control module is used to obtain the furnace top pressure of the blast furnace in real time during the blast furnace charging process, subtract the furnace top pressure from the top pressure control value, and obtain the furnace top pressure fluctuation value; after the blast furnace charging is completed, the furnace top pressure fluctuation value is compared with the fluctuation threshold value, and according to the comparison result, the preset angle is corrected to obtain the corrected preset angle.

[0028] Furthermore, the feedback control module includes:

[0029] a first correction module, configured to compare the furnace top pressure fluctuation value with a first fluctuation threshold value; if the value is greater than the first fluctuation threshold value, subtract the first angle threshold value from the preset angle; and if the value is less than the first fluctuation threshold value, compare the furnace top pressure fluctuation value with a second fluctuation threshold value;

[0030] a second correction module, configured to subtract the second angle threshold from the preset angle if the angle is greater than the second fluctuation threshold, and compare the furnace top pressure fluctuation value with a third fluctuation threshold if the angle is less than the second fluctuation threshold;

[0031] a third correction module, configured to, if the angle is greater than the third fluctuation threshold, subtract the third angle threshold from the preset angle; and, if the angle is less than the third fluctuation threshold, compare the furnace top pressure fluctuation value with a fourth fluctuation threshold;

[0032] a fourth correction module, configured to compare the furnace top pressure fluctuation value with a fifth fluctuation threshold value if the value is less than the fourth fluctuation threshold value; add the third angle threshold value to the preset angle if the value is greater than the fifth fluctuation threshold value; and compare the furnace top pressure fluctuation value with a sixth fluctuation threshold value if the value is less than the fifth fluctuation threshold value;

[0033] The fifth correction module is configured to add the second angle threshold to the preset angle if the angle is greater than the sixth fluctuation threshold, and to add the first angle threshold to the preset angle if the angle is less than the sixth fluctuation threshold.

[0034] Furthermore, the auxiliary program control module also includes:

[0035] a first auxiliary module, configured to compare the gas volume with a first gas volume threshold, and if the gas volume is equal to the first gas volume threshold, close the stator blade opening by a first preset angle; and if the gas volume is less than the first gas volume threshold, compare the gas volume with a second gas volume threshold;

[0036] a second auxiliary module, configured to close the stator blade opening by a second preset angle if the gas volume is equal to the second gas volume threshold, and compare the gas volume with a third gas volume threshold if the gas volume is less than the second gas volume threshold;

[0037] The third auxiliary module is configured to close the stator blade opening to a third preset angle if the gas volume is equal to a third gas volume threshold.

[0038] The present invention provides a blast furnace TRT residual pressure power generation program control method and system. Compared with the existing technology, the present invention reduces the lower peak of active power fluctuation and actually shortens the lower peak by optimizing the TRT stator blade feedforward auxiliary control technology, thereby improving the power generation of the TRT. By adding feedback control to automatically correct the out-of-tolerance program control points, the auxiliary program has a more reasonable impact on the top pressure and power generation, thereby further improving the intelligence level of the control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 1. It is a flow chart of a program-controlled method for generating power from TRT residual pressure of a blast furnace provided by an embodiment of the present invention;

[0040] Figure 2 1 is a schematic diagram of the existing process control flow of the blast furnace TRT system in an embodiment of the present invention;

[0041] Figure 3Schematic diagram of data trend of blast furnace TRT system in an embodiment of the present invention;

[0042] Figure 4 Schematic diagram of active power trend of blast furnace TRT system in an embodiment of the present invention;

[0043] Figure 5 It is a structural schematic diagram of the blast furnace TRT residual pressure power generation program control system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0045] See also Figure 1 The first embodiment of the present invention provides a program-controlled method for generating electricity from TRT residual pressure in a blast furnace, comprising steps S10 to S30:

[0046] Step S10: Open the top material flow valve of the blast furnace to distribute the material to the blast furnace. When the distribution reaches a first time, lock the top pressure regulator of the blast furnace TRT system.

[0047] For the current process control flow of the blast furnace TRT system, please refer to Figure 2 When TRT is running, the clean coal gas after bag dust removal is measured and flows through the TRT inlet butterfly valve, inlet plug valve and quick shut-off valve in sequence, enters the dry axial flow turbine to expand and drive it to rotate to do useful work. The coal gas coming out of the turbine passes through the outlet water seal butterfly valve and is sent out through the pipeline.

[0048] In terms of TRT operation control, the stationary blade opening of TRT is adjusted through the output of the furnace top pressure regulator (PID) to achieve the purpose of stabilizing the furnace top pressure control. In abnormal situations, the pressure reducing valve group is adjusted for adjustment. Under normal circumstances, the pressure regulating valve group is in a fully closed state.

[0049] See also Figure 3The data trend chart for the blast furnace TRT system shown in the figure shows that the fluctuations in TRT active power are synchronized with the opening and closing fluctuations of the stator blades. As the stator blades gradually close from open to closed, the TRT active power also decreases. Further analysis shows that the trend in the stator blade opening is also synchronized with the fluctuations in gas flow. As the gas flow decreases, the stator blade opening also decreases. Observation and analysis of gas flow fluctuations indicate that the cause of gas flow fluctuations is temporary suppression of gas flow during blast furnace charging, particularly ore, due to the small ore size and poor permeability. This reduction in gas flow also causes a decrease in blast furnace top pressure. Due to the lag in stator blade adjustment, the actual top pressure deviates downward, which is reflected in the active power as a downward peak. This reduces TRT active power and affects the power generation of the TRT turbine.

[0050] At present, in the existing technology, there is also a method for adjusting the stator opening based on the relationship between the stator opening and the gas volume, but the existing method of adjusting the stator opening still uses PID to adjust the frequency, number or speed of the stator movement. Its essence is to smooth the fluctuation of the power curve by continuously adjusting the stator opening, but it cannot solve the low peak and valley problems of gas and power generation. The present invention, on the basis of not affecting the original PID control, intervenes in the stator in advance by adding an auxiliary program, thereby adjusting the stator more accurately and improving the power generation of TRT, which is an improvement to the process.

[0051] The present invention reduces the peak value of active power fluctuation and shortens the peak value by optimizing the stator feedforward auxiliary control technology of TRT. Figure 4 As shown in the shaded part, the power generation of TRT under the same working conditions is improved.

[0052] When the blast furnace's top material flow valve opens for blast furnace charge distribution, the program-controlled method of the present invention begins executing a feedforward control operation. Specifically, after a certain delay after the top material flow valve opens, an auxiliary program start command is issued, locking the currently running top pressure regulator PID. This means the auxiliary program is now activated to override the PID control of the stator blades. The reason for delaying the command for a certain period of time is that the timing of the impact on gas flow varies depending on the weight of the blast furnace stone and the distribution gear position. Based on the commonly used charge weights and distribution conditions in China, the points that affect gas flow are all within a 5-second range. Therefore, the delay time can be set to a range of 1 to 5 seconds. It should be noted that the specific numerical values ​​in the embodiments of the present invention are merely used to illustrate the control process of the present method, and are not intended to be specific limitations. These numerical values ​​need to be adjusted based on actual conditions such as different charge materials and distribution gear positions, and will not be repeated here.

[0053] Step S20: obtaining in real time the gas volume of the blast furnace burden distribution when the first time period is reached, comparing the gas volume with a gas volume threshold, and closing the stator blade opening to a preset angle according to the comparison result.

[0054] After the PID is locked, the embodiment of the present invention uses an auxiliary program to override the PID to adjust the stator blades, and then adjusts the stator blade opening based on the comparison between the real-time gas volume and the gas threshold. The specific steps are as follows:

[0055] Step S201: Compare the gas volume with a first gas volume threshold. If the gas volume is equal to the first gas volume threshold, close the stator blade opening by a first preset angle. If the gas volume is less than the first gas volume threshold, compare the gas volume with a second gas volume threshold.

[0056] Step S202: If the gas volume is equal to the second gas volume threshold, the stator blade opening is closed to a second preset angle; if the gas volume is less than the second gas volume threshold, the gas volume is compared with a third gas volume threshold;

[0057] Step S203: If the gas volume is equal to the third gas volume threshold, the stator blade opening is closed to a third preset angle.

[0058] In this embodiment, three gears are set for the auxiliary control. Of course, more gears can be set according to specific circumstances. Here, only three gears are used for illustration. For example, the gas flow rate of a blast furnace TRT system is between 6000 and 8000 under normal working conditions. After a period of loading, the gas flow rate during unloading is between 3000 and 5000. In this case, we can set the gas volume thresholds of the three gears to 5000, 4000 and 3000 respectively, and set the preset angles accordingly. The blast furnace gas flow is then monitored. When the gas flow normally drops to the first gas flow threshold of 5000, or is about to reach 5000, the auxiliary program preemptively intervenes to correct the stator blade opening, closing it by a first preset angle of 1°. Gas flow monitoring continues thereafter. When the gas flow drops to the second gas flow threshold, the stator blade opening is closed by a second preset angle, and when the gas flow drops to the third gas flow threshold, the stator blade opening is closed by a third preset angle. In practice, due to differences in blast furnaces, material distribution, and processes, the gears and preset angles set for the auxiliary control vary. Under actual operating conditions, multiple field tests and fine-tuning are required to determine the optimal gear and preset angle settings. The preemptive intervention on the stator blades provided by the present invention can effectively reduce and shorten the lower peak of active power fluctuations, thereby increasing TRT power generation.

[0059] Step S30, performing delay control on the blast furnace TRT system, when the delay reaches a second time length, unlocking the furnace top pressure regulator, and controlling the stator blade opening through the furnace top pressure regulator.

[0060] The present invention uses an auxiliary program to control the rapid drop in furnace top pressure caused by gas flow suppression during the blast furnace charging process. This advance adjustment of the stator blades compensates for the shortcomings of existing PID control. After the process is completed, after a delay of a certain length, such as 5 to 10 seconds, to allow the system to stabilize, the PID lock is released, and the stator blades continue to be controlled by the furnace top pressure regulator PID until the charging of the furnace top is completed. In other words, the present invention provides more precise adjustment of the stator blades based on PID control.

[0061] Furthermore, in order to make the auxiliary program more reasonable in adjusting the stator blades, the present invention also provides a feedback control to automatically correct the out-of-tolerance program control points. The specific steps are as follows:

[0062] Step S40: During the blast furnace charging process, the top pressure of the blast furnace is obtained in real time, and the top pressure control value is subtracted from the top pressure control value to obtain a top pressure fluctuation value;

[0063] Step S50: After the blast furnace burden is distributed, the furnace top pressure fluctuation value is compared with the fluctuation threshold value, and according to the comparison result, the preset angle is corrected to obtain a corrected preset angle.

[0064] The feedback control of the present invention does not interfere with the auxiliary program during the distribution process, but only obtains the furnace top pressure during the distribution process, and then compares the furnace top pressure with the preset furnace top control value to obtain the furnace top pressure fluctuation value. Then, based on the comparison of the furnace top pressure fluctuation value and the fluctuation threshold, the preset angle of the static blade opening closure in the auxiliary program is corrected. Similar to the gas gear setting in the above steps, due to the different actual conditions of different blast furnaces, the classification of the deviation control of the feedback control is also different. The common one can be divided into three levels of deviation. Of course, according to different top pressure management requirements, it can also be divided into five or more levels. Here, only three levels of deviation control are used as an example. The specific steps are as follows:

[0065] Step S501: Compare the furnace top pressure fluctuation value with a first fluctuation threshold value. If the value is greater than the first fluctuation threshold value, subtract the first angle threshold value from the preset angle. If the value is less than the first fluctuation threshold value, compare the furnace top pressure fluctuation value with a second fluctuation threshold value.

[0066] Step S502: if the value is greater than the second fluctuation threshold, subtract the second angle threshold from the preset angle; if the value is less than the second fluctuation threshold, compare the furnace top pressure fluctuation value with a third fluctuation threshold;

[0067] Step S503: if the value is greater than the third fluctuation threshold, subtract the third angle threshold from the preset angle; if the value is less than the third fluctuation threshold, compare the furnace top pressure fluctuation value with a fourth fluctuation threshold;

[0068] Step S504: If the value is less than the fourth fluctuation threshold, the furnace top pressure fluctuation value is compared with the fifth fluctuation threshold; if the value is greater than the fifth fluctuation threshold, the third angle threshold is added to the preset angle; if the value is less than the fifth fluctuation threshold, the furnace top pressure fluctuation value is compared with the sixth fluctuation threshold;

[0069] Step S505: If the angle is greater than the sixth fluctuation threshold, the second angle threshold is added to the preset angle; if the angle is less than the sixth fluctuation threshold, the first angle threshold is added to the preset angle.

[0070] If we divide it into three levels of control, and since the top pressure fluctuation value is generally within a certain positive and negative range, the fluctuation value range can be divided into:

[0071] ①Furnace top pressure fluctuation value>first fluctuation threshold

[0072] Assume that the fluctuation value between the top pressure and the control value in a blast furnace is generally between ±3 kPa. Here we can assume that the first fluctuation threshold is 3 kPa, and X represents the fluctuation value of the furnace top pressure. Then in case ①, that is, when X>3, the feedback control will reduce the preset angle value by the first angle threshold, such as reducing the angle of the stator blade opening by 3°. That is, if the preset angle of the stator blade opening is 4° in the auxiliary program, it will be adjusted to 1°.

[0073] ② The second fluctuation threshold value is less than the furnace top pressure fluctuation value and the first fluctuation threshold value.

[0074] Similarly, assuming that the second fluctuation threshold is 2 KPa and the second angle threshold is 2°, when 2<X<3, the feedback control will reduce the preset angle value by the second angle threshold.

[0075] ③The third fluctuation threshold value is less than the furnace top pressure fluctuation value and less than the second fluctuation threshold value.

[0076] Assuming that the third fluctuation threshold is 1 KPa and the third angle threshold is 1°, when 1<X<2, the feedback control will reduce the preset angle value by the third angle threshold.

[0077] ④The fourth fluctuation threshold value is less than the furnace top pressure fluctuation value and less than the third fluctuation threshold value.

[0078] Assuming that the fourth fluctuation threshold is -1 KPa, when -1<X<1, it means that the top pressure fluctuation is small, that is, the previous auxiliary program adjusts the stator blade accurately, so the preset angle is not adjusted in this case.

[0079] ⑤ The fifth fluctuation threshold value is less than the furnace top pressure fluctuation value and less than the fourth fluctuation threshold value.

[0080] Assuming that the fifth fluctuation threshold is -2Kpa, when -2<X<-1, the feedback control will add the preset angle value to the third angle threshold. That is to say, when the top pressure is greater than the control value, the closing angle of the stator blade opening will be reduced, and when the top pressure is less than the control value and the fluctuation value is negative, the closing angle of the stator blade opening will be increased.

[0081] ⑥ The sixth fluctuation threshold value is less than the furnace top pressure fluctuation value and less than the fifth fluctuation threshold value.

[0082] Similarly, assuming the sixth fluctuation threshold is -3 KPa, when -3<X<-2, the feedback control will add the second angle threshold to the preset angle value.

[0083] ⑦Furnace top pressure fluctuation value < sixth fluctuation threshold

[0084] When X<-3, it indicates that the fluctuation of the top pressure is large, and therefore the preset angle needs to be added to the first angle threshold.

[0085] Thus, the feedback control of the present invention effectively verifies and classifies the impact of the auxiliary program on top pressure, and corrects the stator angle of the auxiliary program. This automatic correction function further enhances the intelligent level of the control system. It should be noted that the numerical settings for the auxiliary program and the feedback control need to be matched to the actual conditions of the blast furnace. The above examples are merely illustrative of the entire control process, and do not limit the numerical values, gears, or classifications.

[0086] An embodiment of the present invention provides a program-controlled method for blast furnace TRT residual pressure power generation. Compared with the traditional method in which the hysteresis of PID adjustment of the stator blades causes the reduction of TRT active power, which affects the power generation of the TRT turbine, the present invention uses feedforward control and auxiliary programs to intervene in the stator blades in advance by periodically covering PID without affecting the original PID control of the system, thereby reducing and shortening the peak of active power fluctuations, improving the power generation of TRT, and continuously and automatically correcting the intervention angle through feedback control. When the intervention angle is more precise, the intelligence level of the control system is also improved.

[0087] See also Figure 5 Based on the same inventive concept, the second embodiment of the present invention provides a blast furnace TRT residual pressure power generation program control system, comprising:

[0088] The feedforward control module 10 is configured to open the top material flow valve of the blast furnace to distribute the material to the blast furnace, and lock the top pressure regulator of the blast furnace TRT system when the material distribution reaches a first time length;

[0089] The auxiliary program control module 20 is used to obtain in real time the amount of gas for blast furnace distribution when the first time period is reached, compare the gas amount with the gas amount threshold, and close the stator opening to a preset angle according to the comparison result; perform delay control on the blast furnace TRT system, and when the delay reaches the second time period, unlock the furnace top pressure regulator and control the stator opening through the furnace top pressure regulator.

[0090] Furthermore, the auxiliary program control module 20 further includes:

[0091] A first auxiliary module 201 is configured to compare the gas volume with a first gas volume threshold value, and if the gas volume is equal to the first gas volume threshold value, close the stator blade opening to a first preset angle; if the gas volume is less than the first gas volume threshold value, compare the gas volume with a second gas volume threshold value;

[0092] A second auxiliary module 202 is configured to close the stator blade opening by a second preset angle if the gas volume is equal to the second gas volume threshold, and compare the gas volume with a third gas volume threshold if the gas volume is less than the second gas volume threshold;

[0093] The third auxiliary module 203 is configured to close the stator blade opening to a third preset angle if the gas volume is equal to a third gas volume threshold.

[0094] Furthermore, the system also includes:

[0095] The feedback control module 30 is used to obtain the furnace top pressure of the blast furnace in real time during the blast furnace charging process, subtract the furnace top pressure from the top pressure control value, and obtain the furnace top pressure fluctuation value; after the blast furnace charging is completed, the furnace top pressure fluctuation value is compared with the fluctuation threshold value, and according to the comparison result, the preset angle is corrected to obtain the corrected preset angle.

[0096] The feedback control module 30 further includes:

[0097] A first correction module 301 is configured to compare the furnace top pressure fluctuation value with a first fluctuation threshold value. If the value is greater than the first fluctuation threshold value, the first angle threshold value is subtracted from the preset angle. If the value is less than the first fluctuation threshold value, the furnace top pressure fluctuation value is compared with a second fluctuation threshold value.

[0098] A second correction module 302 is configured to subtract the second angle threshold from the preset angle if the angle is greater than the second fluctuation threshold, and compare the furnace top pressure fluctuation value with a third fluctuation threshold if the angle is less than the second fluctuation threshold;

[0099] A third correction module 303 is configured to subtract the third angle threshold from the preset angle if the angle is greater than the third fluctuation threshold, and compare the furnace top pressure fluctuation value with a fourth fluctuation threshold if the angle is less than the third fluctuation threshold;

[0100] a fourth correction module 304 configured to compare the furnace top pressure fluctuation value with a fifth fluctuation threshold value if the value is less than the fourth fluctuation threshold value; add the third angle threshold value to the preset angle if the value is greater than the fifth fluctuation threshold value; and compare the furnace top pressure fluctuation value with a sixth fluctuation threshold value if the value is less than the fifth fluctuation threshold value;

[0101] The fifth correction module 305 is configured to add the second angle threshold to the preset angle if the angle is greater than the sixth fluctuation threshold, and to add the first angle threshold to the preset angle if the angle is less than the sixth fluctuation threshold.

[0102] The technical features and technical effects of a blast furnace TRT residual pressure power generation program control system proposed in an embodiment of the present invention are the same as those of the method proposed in an embodiment of the present invention and will not be described in detail here. Each module in the above-mentioned blast furnace TRT residual pressure power generation program control system can be implemented in whole or in part through software, hardware, or a combination thereof. Each of the above-mentioned modules can be embedded in or independent of the processor in the computer device in hardware form, or can be stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to the above modules.

[0103] In summary, embodiments of the present invention provide a programmable control method and system for blast furnace TRT residual pressure power generation. The programmable control method opens the blast furnace's top material flow valve to distribute the blast furnace. When the distribution reaches a first duration, the top pressure regulator of the blast furnace TRT system is locked. The gas volume of the blast furnace distribution when the first duration is reached is obtained in real time, the gas volume is compared with a gas volume threshold, and the stator blade opening is closed to a preset angle according to the comparison result. The blast furnace TRT system is subjected to delay control. When the delay reaches a second duration, the top pressure regulator is unlocked and the stator blade opening is controlled by the top pressure regulator. The present invention uses feedforward control and auxiliary programs to preemptively intervene in the stator blades by periodically overriding the PID control without affecting the system's original PID control, thereby reducing and shortening the peak under active power fluctuations and increasing the TRT power generation. The intervention angle is continuously and automatically corrected through feedback control, making the intervention angle more precise and improving the system's intelligence level.

[0104] Each embodiment in this specification is described in a progressive manner, and the same or similar parts of each embodiment can be directly referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. It should be noted that the various technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the various technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] The above-described embodiments merely represent several preferred implementations of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art could make several improvements and substitutions without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be based on the scope of protection of the claims.

Claims

1. A blast furnace TRT residual pressure power generation program control method, characterized in that: Applied to blast furnace TRT system, including: Open the top material flow valve of the blast furnace to distribute the material to the blast furnace. When the material distribution reaches the first time, lock the top pressure regulator of the blast furnace TRT system; obtaining in real time the gas volume of the blast furnace burden distribution when the first duration is reached, comparing the gas volume with a gas volume threshold, and closing the stator blade opening to a preset angle according to the comparison result; performing delay control on the blast furnace TRT system, and when the delay reaches a second time length, unlocking the furnace top pressure regulator, and controlling the stator blade opening by the furnace top pressure regulator; During the blast furnace charging process, the furnace top pressure of the blast furnace is obtained in real time, and the furnace top pressure fluctuation value is obtained by subtracting the furnace top pressure from the top pressure control value; After the blast furnace burden is distributed, the furnace top pressure fluctuation value is compared with the fluctuation threshold value, and according to the comparison result, the preset angle is corrected to obtain a corrected preset angle.

2. The blast furnace TRT residual pressure power generation program control method according to claim 1, characterized in that: The step of comparing the furnace top pressure fluctuation value with a fluctuation threshold and performing angle correction on the preset angle according to the comparison result includes: Comparing the furnace top pressure fluctuation value with a first fluctuation threshold; if the value is greater than the first fluctuation threshold, subtracting the first angle threshold from the preset angle; if the value is less than the first fluctuation threshold, comparing the furnace top pressure fluctuation value with a second fluctuation threshold; If it is greater than the second fluctuation threshold, subtracting the second angle threshold from the preset angle; if it is less than the second fluctuation threshold, comparing the furnace top pressure fluctuation value with the third fluctuation threshold; If it is greater than the third fluctuation threshold, subtracting the third angle threshold from the preset angle; if it is less than the third fluctuation threshold, comparing the furnace top pressure fluctuation value with the fourth fluctuation threshold; If the value is less than the fourth fluctuation threshold, the furnace top pressure fluctuation value is compared with the fifth fluctuation threshold; if the value is greater than the fifth fluctuation threshold, the third angle threshold is added to the preset angle; if the value is less than the fifth fluctuation threshold, the furnace top pressure fluctuation value is compared with the sixth fluctuation threshold; If it is greater than the sixth fluctuation threshold, the second angle threshold is added to the preset angle; if it is less than the sixth fluctuation threshold, the first angle threshold is added to the preset angle.

3. The blast furnace TRT residual pressure power generation program control method according to claim 1, characterized in that: The corrected preset angle takes effect when the blast furnace performs the next blast furnace charging.

4. The blast furnace TRT residual pressure power generation program control method according to claim 1, characterized in that: The step of comparing the gas volume with the gas volume threshold and closing the stator blade opening to a preset angle according to the comparison result includes: Comparing the gas volume with a first gas volume threshold; if the gas volume is equal to the first gas volume threshold, closing the stator blade opening by a first preset angle; if the gas volume is less than the first gas volume threshold, comparing the gas volume with a second gas volume threshold; If the gas volume is equal to the second gas volume threshold, the stator blade opening is closed by a second preset angle; if the gas volume is less than the second gas volume threshold, the gas volume is compared with a third gas volume threshold; If it is equal to the third gas volume threshold, the stator blade opening is closed to a third preset angle.

5. A blast furnace TRT residual pressure power generation program control system, characterized in that: Applied to blast furnace TRT system, including: A feedforward control module is used to open the top material flow valve of the blast furnace to distribute the material to the blast furnace, and when the distribution reaches a first time, lock the top pressure regulator of the blast furnace TRT system; an auxiliary program control module, configured to obtain in real time the amount of gas used for blast furnace distribution when the first time period is reached, compare the amount of gas with a gas threshold, and close the stator blade opening to a preset angle based on the comparison result; perform delay control on the blast furnace TRT system, unlock the furnace top pressure regulator when the delay reaches a second time period, and control the stator blade opening via the furnace top pressure regulator; The feedback control module is used to obtain the furnace top pressure of the blast furnace in real time during the blast furnace charging process, subtract the furnace top pressure from the top pressure control value, and obtain the furnace top pressure fluctuation value; after the blast furnace charging is completed, the furnace top pressure fluctuation value is compared with the fluctuation threshold value, and according to the comparison result, the preset angle is corrected to obtain the corrected preset angle.

6. The blast furnace TRT residual pressure power generation program control system according to claim 5, characterized in that: The feedback control module includes: a first correction module, configured to compare the furnace top pressure fluctuation value with a first fluctuation threshold value; if the value is greater than the first fluctuation threshold value, subtract the first angle threshold value from the preset angle; and if the value is less than the first fluctuation threshold value, compare the furnace top pressure fluctuation value with a second fluctuation threshold value; a second correction module, configured to subtract the second angle threshold from the preset angle if the angle is greater than the second fluctuation threshold, and compare the furnace top pressure fluctuation value with a third fluctuation threshold if the angle is less than the second fluctuation threshold; a third correction module, configured to, if the angle is greater than the third fluctuation threshold, subtract the third angle threshold from the preset angle; and, if the angle is less than the third fluctuation threshold, compare the furnace top pressure fluctuation value with a fourth fluctuation threshold; a fourth correction module, configured to compare the furnace top pressure fluctuation value with a fifth fluctuation threshold value if the value is less than the fourth fluctuation threshold value; add the third angle threshold value to the preset angle if the value is greater than the fifth fluctuation threshold value; and compare the furnace top pressure fluctuation value with a sixth fluctuation threshold value if the value is less than the fifth fluctuation threshold value; The fifth correction module is configured to add the second angle threshold to the preset angle if the angle is greater than the sixth fluctuation threshold, and to add the first angle threshold to the preset angle if the angle is less than the sixth fluctuation threshold.

7. The blast furnace TRT residual pressure power generation program control system according to claim 5, characterized in that: The auxiliary program control module also includes: a first auxiliary module, configured to compare the gas volume with a first gas volume threshold, and if the gas volume is equal to the first gas volume threshold, close the stator blade opening by a first preset angle; and if the gas volume is less than the first gas volume threshold, compare the gas volume with a second gas volume threshold; a second auxiliary module, configured to close the stator blade opening by a second preset angle if the gas volume is equal to the second gas volume threshold, and compare the gas volume with a third gas volume threshold if the gas volume is less than the second gas volume threshold; The third auxiliary module is configured to close the stator blade opening to a third preset angle if the gas volume is equal to a third gas volume threshold.

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