TRT top pressure segmented control method based on change of static vane opening

Abstract

The present application relates to the technical field of energy and power engineering, and particularly relates to a TRT top pressure segmented control method based on static blade opening degree change, characterized in that, after the function of reducing the pressure of a blast furnace by a pressure reducing valve group is exited, the top pressure of the blast furnace is controlled by a TRT turbine unit, and the specific control steps are as follows: 1) blast furnace authorization, program starting; 2) top pressure deviation calculator assignment; 3) comparison of dead zone parameters, program downward execution; 4) presetting two groups of segmented control parameters; 5) first level cumulative calculator assignment; 6) second level cumulative calculator assignment; 7) setting static blade parameters; 8) control execution, static blade opening degree controller driving TRT static blade action, and completing the control of the top pressure of the blast furnace. The present application has the advantages that: the design cycle of the blast furnace TRT top pressure control program is greatly shortened, the debugging steps of engineering and technical personnel are simplified, the precious debugging time is saved, the same group of programs can be used among different blast furnace TRT units, and the transplantation of the control function becomes easy and simple.

Description

Technical Field

[0001] This invention relates to the field of energy and power engineering technology, and in particular to a TRT top pressure segmented control method based on the change of stator blade opening. Background Technology

[0002] TRT (Truck Gas Residual Pressure Generator) is a power generation device for blast furnace gas. High-temperature and high-pressure blast furnace gas performs work through a turbine, which drives a generator to produce electricity. The blast furnace top pressure is jointly controlled by the pressure reducing valve group and the TRT. When the TRT is shut down, the pressure reducing valve group performs the control function. When the TRT is running at full load, the control of the blast furnace top pressure is switched to the TRT.

[0003] PID is a conventional TRT control method for blast furnace top pressure, which can meet the top pressure control requirements of most blast furnaces. However, for large blast furnaces with strong disturbances, conventional PID control can no longer meet the requirements for top pressure fluctuations.

[0004] Currently, various unconventional PID control methods in China generally have complex algorithms, long debugging times, and low practicality and portability. Summary of the Invention

[0005] The purpose of this invention is to provide a segmented control method for TRT top pressure based on the change of stationary blade opening, which overcomes the shortcomings of the prior art and can be applied to blast furnace PID control to solve the problems of complex algorithms, long debugging time, low practicality and portability in related technologies.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A segmented control method for TRT top pressure based on the change of stationary blade opening is characterized in that, after the function of the pressure reducing valve group in controlling the blast furnace top pressure is withdrawn, the TRT turbine unit controls the blast furnace top pressure. The specific control steps are as follows: 1) Blast furnace authorization: When the TRTPLC control system receives the blast furnace main control room's signal authorizing TRT control of top pressure, the program starts; 2) Top pressure deviation calculator assignment: The preset top pressure value is subtracted from the measured top pressure value, and a signal deviation correction factor is added. The calculation result is sent to the top pressure deviation calculator; 3) Dead zone parameter comparison: The absolute value of the top pressure deviation calculator is compared with the dead zone parameter. If the difference is greater than zero, the program continues; 4) Two sets of segmented control parameters are preset: one set consists of 7 positive numbers, corresponding to 1Kpa to 7Kpa, and the other set consists of 7 negative numbers, corresponding to -1Kpa to -7Kpa; 5) The first-level accumulator is assigned a value, which is the preset segmented control parameter value and sent to the first-level accumulator; 6) The second-level accumulator is assigned a value, which is the TRT stationary blade opening value added to the first-level accumulator and the result is sent to the second-level accumulator; 7) The stationary blade parameters are set, and the minimum limit parameter of the stationary blade is preset. When the value of the second-level accumulator is greater than the value of the stationary blade, the second-level accumulator assigns the value to the stationary blade opening controller; 8) Control is executed, and the stationary blade opening controller drives the TRT stationary blade to complete the control of the blast furnace top pressure.

[0008] Preferably, the default value of the dead zone parameter is 0.1 kPa.

[0009] Preferably, when the top pressure deviation calculator value is positive, if its value is between 0 kPa and 1 kPa, the value of the preset segmented control parameter 1 kPa is sent to the first-level accumulator; if its value is between >1 kPa and 2 kPa, the value of the preset segmented control parameter 2 kPa is sent to the first-level accumulator; if its value is between >2 kPa and 3 kPa, the value of the preset segmented control parameter 3 kPa is sent to the first-level accumulator; similarly, the values ​​of 4 kPa, 5 kPa, 6 kPa, and 7 kPa are sent to the first-level accumulator.

[0010] Preferably, when the top pressure deviation calculator value is negative, if it is between 0 kPa and -1 kPa, the value of the preset segmented control parameter -1 kPa is sent to the first-level accumulator; if it is between -1 kPa and -2 kPa, the value of the preset segmented control parameter -2 kPa is sent to the first-level accumulator; if it is between -2 kPa and -3 kPa, the value of the preset segmented control parameter -3 kPa is sent to the first-level accumulator; similarly, the values ​​of -4 kPa, -5 kPa, -6 kPa, and -7 kPa are sent to the first-level accumulator.

[0011] Preferably, the segmented control parameters are preset, with the first group being 1, 2, 3, 4, 5, 6, 7; and the second group being -1, -2, -3, -4, -5, -8, -15.

[0012] Preferably, the minimum limiting parameter value of the stationary blade is 36%.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] This invention allows technicians to easily fulfill the blast furnace TRT top pressure control requirements simply by inputting segmented control parameters (1Kpa~7Kpa and -1Kpa~-7Kpa, 14 stationary blade opening change values) based on the debugging results. This significantly shortens the design cycle of the blast furnace TRT top pressure control program, simplifies the debugging steps for engineers, saves valuable debugging time, and allows the same program to be used between TRT units of different blast furnaces. It also makes the porting of control functions easier and more practical. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the control flow according to an embodiment of the present invention. Detailed Implementation

[0016] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in numerous different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0019] See Figure 1 This is a schematic diagram of the control flow of a TRT top pressure segmented control method based on the change of stationary blade opening, which is used to control the blast furnace top pressure by the TRT turbine unit after the function of the pressure reducing valve group in controlling the blast furnace top pressure is withdrawn. The specific control steps are as follows:

[0020] 1) When the TRTPLC control system receives the blast furnace top pressure control signal from the blast furnace main control room, the function of the pressure reducing valve group controlling the blast furnace top pressure is deactivated, and the TRT turbine unit controls the blast furnace top pressure instead.

[0021] 2) Subtract the measured value of the top pressure from the preset value of the top pressure, add the signal deviation correction factor, and send the calculation result to the top pressure deviation calculator;

[0022] 3) The preset dead zone parameter has a default value of 0.1 kPa. The top pressure deviation calculator takes the absolute value and compares it with the dead zone parameter. If the value is greater than zero, the program continues to execute.

[0023] 4) Two sets of segmented control parameters are preset. One set consists of 7 positive numbers, corresponding to 1 kPa to 7 kPa respectively, and the other set consists of 7 negative numbers, corresponding to -1 kPa to -7 kPa respectively. The preset values ​​for TRT of blast furnace No. 5 are 1, 2, 3, 4, 5, 6, 7 in the first set and -1, -2, -3, -4, -5, -8, -15 in the second set.

[0024] 5) When the top pressure deviation calculator value is positive and its value is between 0 kPa and 1 kPa, the value of the preset segmented control parameter 1 kPa is sent to the first-level accumulator; when its value is between 1 kPa and 2 kPa, the value of the preset segmented control parameter 2 kPa is sent to the first-level accumulator; when its value is between 2 kPa and 3 kPa, the value of the preset segmented control parameter 3 kPa is sent to the first-level accumulator; similarly, the values ​​of 4 kPa, 5 kPa, 6 kPa, and 7 kPa are sent to the first-level accumulator.

[0025] When the top pressure deviation calculator value is negative, and its value is between 0 kPa and -1 kPa, the value of the preset segmented control parameter -1 kPa is taken and sent to the first-level accumulator; when its value is between -1 kPa and -2 kPa, the value of the preset segmented control parameter -2 kPa is taken and sent to the first-level accumulator; when its value is between -2 kPa and -3 kPa, the value of the preset segmented control parameter -3 kPa is taken and sent to the first-level accumulator; similarly, the values ​​of -4 kPa, -5 kPa, -6 kPa, and -7 kPa are taken and sent to the first-level accumulator.

[0026] 6) Add the TRT stationary blade opening value to the first-level accumulator, and send the calculation result to the second-level accumulator;

[0027] 7) The minimum limit parameter of the stationary blade is preset, with a default value of 36%. When the value of the secondary accumulator is greater than this value, the secondary accumulator assigns the value to the stationary blade opening controller.

[0028] 8) The stationary blade opening controller drives the TRT stationary blade movement.

[0029] In this embodiment, the blast furnace volume is 2580 m³. 3 The designed annual output is 2.435 million tons, with a fuel ratio of 510 kg / ton and process energy consumption of 370 kg / ton. It is equipped with a TRT model GT200.WD, a dual-use dry and wet power unit with an inlet pressure of 210 kPa, an outlet pressure of 12 kPa, and a flow rate of 550,000 Nm³.3 / h, rated power 20070KW.

[0030] This invention focuses on the minimum limit of the stationary blade position and the values ​​of two sets of 14 parameters during the shifting process. For blade opening overshoot, the parameter values ​​are decreased accordingly; for stationary blade tracking lag, the parameter values ​​are increased accordingly. This process is repeated until suitable values ​​are found.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A segmented control method for TRT top pressure based on stator blade opening variation, characterized in that, When the function of the pressure reducing valve group in controlling the blast furnace top pressure is discontinued, the TRT turbine unit controls the blast furnace top pressure. The specific control steps are as follows: 1) Blast furnace authorization: When the TRT PLC control system receives the blast furnace main control room's signal authorizing TRT control of the top pressure, the program starts. 2) Assigning values ​​to the top pressure deviation calculator: Subtract the measured top pressure value from the preset top pressure value, add the signal deviation correction factor, and send the calculation result to the top pressure deviation calculator. 3) Compare the dead zone parameter, take the absolute value from the top pressure deviation calculator, compare it with the dead zone parameter, and if the difference is greater than zero, the program continues to execute; 4) Two sets of segmented control parameters are preset: one set consists of 7 positive numbers, corresponding to 1 kPa to 7 kPa, and the other set consists of 7 negative numbers, corresponding to -1 kPa to -7 kPa. 5) The first-level accumulator is assigned a value, and the preset segmented control parameter value is sent to the first-level accumulator. When the top pressure deviation calculator value is positive, if its value is between 0 kPa and 1 kPa, the preset segmented control parameter 1 kPa value is sent to the first-level accumulator; if its value is between >1 kPa and 2 kPa, the preset segmented control parameter 2 kPa value is sent to the first-level accumulator; if its value is between >2 kPa and 3 kPa, the preset segmented control parameter 3 kPa value is sent to the first-level accumulator; similarly, values ​​of 4 kPa, 5 kPa, 6 kPa, and 7 kPa are sent to the first-level accumulator. The value is fed into the first-level accumulator calculator; when the top pressure deviation calculator value is negative, if its value is between 0 kPa and -1 kPa, the value of the preset segmented control parameter -1 kPa is fed into the first-level accumulator calculator; if its value is between -1 kPa and -2 kPa, the value of the preset segmented control parameter -2 kPa is fed into the first-level accumulator calculator; if its value is between -2 kPa and -3 kPa, the value of the preset segmented control parameter -3 kPa is fed into the first-level accumulator calculator; similarly, the values ​​of -4 kPa, -5 kPa, -6 kPa, and -7 kPa are fed into the first-level accumulator calculator. 6) Assigning values ​​to the second-level accumulator: Add the TRT stationary blade opening value to the first-level accumulator, and send the calculation result to the second-level accumulator. 7) Set the stationary blade parameters, preset the minimum limit parameter of the stationary blade, and when the value of the secondary accumulator is greater than the value, the secondary accumulator assigns the value to the stationary blade opening controller; 8) Control execution: The stationary blade opening controller drives the TRT stationary blade to complete the control of the blast furnace top pressure.

2. The TRT top pressure segmented control method based on stator blade opening variation according to claim 1, characterized in that, The default value for the dead zone parameter is 0.1 kPa.

3. The TRT top pressure segmented control method based on stator blade opening variation according to claim 1, characterized in that, The segmented control parameters are preset as follows: the first group is 1, 2, 3, 4, 5, 6, 7; the second group is -1, -2, -3, -4, -5, -8, -15.

4. The TRT top pressure segmented control method based on the change of stator blade opening according to claim 1, characterized in that, The minimum limit parameter value for the stationary blade is 36%.

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