CN113201610B - Control method and system for blast furnace top pressure - Google Patents
Control method and system for blast furnace top pressure Download PDFInfo
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- CN113201610B CN113201610B CN202110428222.3A CN202110428222A CN113201610B CN 113201610 B CN113201610 B CN 113201610B CN 202110428222 A CN202110428222 A CN 202110428222A CN 113201610 B CN113201610 B CN 113201610B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/006—Automatically controlling the process
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/24—Test rods or other checking devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention provides a control method and a system for blast furnace top pressure, wherein the method comprises the following steps: receiving a first top pressure and a second top pressure by using a main frame of a pressure reducing valve bank; receiving a third top pressure and a fourth top pressure by using the differential pressure power generation main frame; determining a first target top pressure from the first top pressure and the second top pressure based on a control strategy for the main frame of the pressure reducing valve group, and sending the first target top pressure to the main frame of the differential pressure power generation; determining a second target top pressure from a third top pressure and a fourth top pressure based on a control strategy aiming at the differential pressure power generation main frame, and sending the second target top pressure to the pressure reduction valve group main frame; determining a target top pressure participating in pressure regulation based on the first target top pressure and the second target top pressure; therefore, the two signal isolators can output four paths of top pressure signals, and signal output redundancy is realized; two paths of top pressure signals output by each signal isolator respectively enter different IO racks, input redundancy of the signals is achieved, effective top pressure signals are guaranteed to be collected, and stability of furnace conditions is guaranteed.
Description
Technical Field
The invention belongs to the technical field of automatic control of metallurgy, and particularly relates to a control method and a control system for the top pressure of a blast furnace.
Background
Along with the construction of large-scale iron-making blast furnaces, the automation degree is continuously improved, the important parameter of the blast furnace top pressure plays a decisive role in the blast furnace condition, and whether the blast furnace condition is stable or not directly influences the yield and quality of molten iron, so the control of the furnace top pressure is particularly important.
In the related art, the furnace top pressure cannot be effectively adjusted due to the failure of mechanical equipment participating in the adjustment of the furnace top pressure, and further, the furnace condition is unstable.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a control method and a control system for the furnace top pressure of a blast furnace, which are used for solving the technical problem that the furnace condition is unstable due to the fact that the furnace top pressure cannot be effectively controlled due to the failure of mechanical equipment when the furnace top pressure is controlled in the prior art.
The invention provides a control method of blast furnace top pressure, which comprises the following steps:
receiving a first top pressure sent by a first input/output (IO) rack of the pressure reducing valve bank and a second top pressure sent by a second IO rack of the pressure reducing valve bank by using a main rack of the pressure reducing valve bank; the first top pressure is output by a first signal isolator, the input end of the first signal isolator is connected with a first pressure sensor, the second top pressure is output by a second signal isolator, and the input end of the second signal isolator is connected with a second pressure sensor;
receiving a third top pressure sent by a first differential pressure generation IO frame and a fourth top pressure sent by a second differential pressure generation IO frame by using a differential pressure generation main frame; the third top pressure is output by the first signal isolator, the input end of the first signal isolator is connected with the first pressure sensor, the fourth top pressure is output by the second signal isolator, and the input end of the second signal isolator is connected with the second pressure sensor;
determining a first target top pressure from the first top pressure and the second top pressure based on a preset control strategy for the main frame of the pressure reducing valve group, and sending the first target top pressure to the main frame of the differential pressure power generation;
determining a second target top pressure from the third top pressure and the fourth top pressure based on a preset control strategy and sending the second target top pressure to the pressure-reducing valve group main frame aiming at the differential pressure power generation main frame;
and determining the target top pressure participating in pressure regulation based on the first target top pressure and the second target top pressure.
Optionally, the determining a first target top pressure from the first top pressure and the second top pressure based on a preset control strategy includes:
judging whether the first top pressure and the second top pressure meet a preset target pressure threshold value or not;
if the first top pressure is determined to meet the target pressure threshold and the second top pressure is determined not to meet the target pressure threshold, determining the first top pressure as the first target top pressure;
and if the first top pressure is determined not to meet the target pressure threshold and the second top pressure meets the target pressure threshold, determining the second top pressure as the first target top pressure.
Optionally, if it is determined that both the first pressing force and the second pressing force satisfy the preset target pressure threshold, the method further includes:
determining a first pressure difference value of the first top pressure and the second top pressure;
and judging whether the first pressure difference value meets a preset pressure range, and if the first pressure difference value meets the preset pressure range, taking the average value of the first top pressure and the second top pressure as the first target top pressure.
Optionally, the method further includes:
and if the first pressure difference value is determined not to meet the preset pressure range, taking the larger top pressure value of the first top pressure and the second top pressure as the first target top pressure.
Optionally, the method further includes:
and monitoring whether the main frame of the pressure reducing valve bank fails, and if the main frame of the pressure reducing valve bank fails, switching the main frame of the pressure reducing valve bank to a slave frame of the pressure reducing valve bank.
Optionally, the method further includes:
and monitoring whether the differential pressure power generation main frame breaks down or not, and if the differential pressure power generation main frame breaks down, switching the differential pressure power generation main frame to a differential pressure power generation slave frame.
The invention also provides a blast furnace top pressure control system, comprising:
the pressure reducing valve bank main frame is used for receiving first top pressure sent by a first IO (input/output) frame of the pressure reducing valve bank and second top pressure sent by a second IO frame of the pressure reducing valve bank; determining a first target top pressure from the first top pressure and the second top pressure based on a preset control strategy, and sending the first target top pressure to the differential pressure power generation main frame; the first top pressure is output by a first signal isolator, the input end of the first signal isolator is connected with a first pressure sensor, the second top pressure is output by a second signal isolator, and the input end of the second signal isolator is connected with a second pressure sensor;
the differential pressure power generation main frame is used for receiving third top pressure sent by a first differential pressure power generation IO frame and fourth top pressure sent by a second differential pressure power generation IO frame; determining a second target top pressure from the third top pressure and the fourth top pressure based on a preset control strategy, and sending the second target top pressure to the main frame of the pressure reducing valve group; the third top pressure is output by the first signal isolator, the input end of the first signal isolator is connected with the first pressure sensor, the fourth top pressure is output by the second signal isolator, and the input end of the second signal isolator is connected with the second pressure sensor;
the pressure reducing valve group main frame or the differential pressure power generation main frame is also used for: and determining the target top pressure participating in pressure regulation based on the first target top pressure and the second target top pressure.
Optionally, the pressure reducing valve group main frame is specifically configured to:
judging whether the first top pressure and the second top pressure meet a preset target pressure threshold value or not;
if the first top pressure is determined to meet the target pressure threshold and the second top pressure is determined not to meet the target pressure threshold, determining the first top pressure as the first target top pressure;
and if the first top pressure is determined not to meet the target pressure threshold and the second top pressure meets the target pressure threshold, determining the second top pressure as the first target top pressure.
Optionally, if it is determined that both the first top pressure and the second top pressure meet a preset target pressure threshold, the main frame of the pressure reducing valve group is further configured to:
determining a first pressure difference value of the first top pressure and the second top pressure;
and judging whether the first pressure difference value meets a preset pressure range, and if the first pressure difference value meets the preset pressure range, taking the average value of the first top pressure and the second top pressure as the first target top pressure.
Optionally, the pressure relief valve block main frame is further configured to:
and if the first pressure difference value is determined not to meet the preset pressure range, taking the larger top pressure value of the first top pressure and the second top pressure as the first target top pressure.
The embodiment of the invention provides a method and a system for controlling the top pressure of a blast furnace, wherein the method comprises the following steps: receiving a first top pressure sent by a first IO frame of the pressure reducing valve bank and a second top pressure sent by a second IO frame of the pressure reducing valve bank by using a main frame of the pressure reducing valve bank; the first top pressure is output by a first signal isolator, the input end of the first signal isolator is connected with a first pressure sensor, the second top pressure is output by a second signal isolator, and the input end of the second signal isolator is connected with a second pressure sensor; receiving a third top pressure sent by a first differential pressure generation IO frame and a fourth top pressure sent by a second differential pressure generation IO frame by using a differential pressure generation main frame; the third top pressure is output by the first signal isolator, the input end of the first signal isolator is connected with the first pressure sensor, the fourth top pressure is output by the second signal isolator, and the input end of the second signal isolator is connected with the second pressure sensor; determining a first target top pressure from the first top pressure and the second top pressure based on a preset control strategy for the main frame of the pressure reducing valve bank, and sending the first target top pressure to the main frame of the differential pressure power generation; determining a second target top pressure from the third top pressure and the fourth top pressure based on a preset control strategy and sending the second target top pressure to the pressure-reducing valve group main frame aiming at the differential pressure power generation main frame; determining a target top pressure participating in pressure regulation based on the first target top pressure and the second target top pressure; therefore, instrument redundancy is realized by utilizing the two pressure sensors, four paths of jacking signals can be simultaneously output by the two signal isolators in a one-in two-out mode, signal output redundancy is realized, and the reliability of jacking signal output is ensured; two paths of top pressure signals output by each signal isolator respectively enter different IO racks (a pressure reducing valve group IO rack and a differential pressure generation IO rack), so that input redundancy of the signals is realized; therefore, even if one path of equipment fails in the actual production process, the collection of effective top pressure signals can be ensured due to the fact that corresponding redundant equipment exists in each equipment. Thereby effectively participating in the adjustment of the pressure of the furnace top and ensuring the stable furnace condition.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic view of the overall structure of a blast furnace top pressure control system provided in an embodiment of the present invention;
fig. 2 is a schematic flow chart of a blast furnace top pressure control method provided by an embodiment of the invention.
Detailed Description
The technical problem that furnace conditions are unstable due to the fact that furnace top pressure cannot be effectively controlled when mechanical equipment fails when furnace top pressure control is conducted in the prior art is solved; the embodiment of the invention provides a method and a system for controlling the top pressure of a blast furnace.
In order to better understand the technical solutions, the technical solutions of the embodiments of the present specification are described in detail below with reference to the drawings and specific embodiments, and it should be understood that the specific features of the embodiments and embodiments of the present specification are detailed descriptions of the technical solutions of the embodiments of the present specification, and are not limitations of the technical solutions of the present specification, and the technical features of the embodiments and embodiments of the present specification may be combined with each other without conflict.
In order to better understand the technical solution of the embodiment of the present invention, a control system of the top pressure of the blast furnace is described, as shown in fig. 1, the system includes: the system comprises a first pressure transmitter 101, a second pressure transmitter 102, a pressure reducing valve group main frame 103, a pressure reducing valve group auxiliary frame 104, a differential pressure power generation main frame 105, a differential pressure power generation auxiliary frame 106, a first signal isolator 107, a second signal isolator 108, a pressure reducing valve group first IO frame 109, a pressure reducing valve group second IO frame 110, a differential pressure power generation first IO frame 111 and a differential pressure power generation second IO frame 112.
To provide power to the first signal isolator 107 and the second signal isolator 108, with continued reference to fig. 1, the system further comprises: a first UPS power supply 113, a second UPS power supply 114, a first DC stabilized power supply 115, a second DC stabilized power supply 116, and a power redundancy module 117; wherein the content of the first and second substances,
a first UPS power source 113 and a second UPS power source 114; the first direct-current stabilized power supply 115 and the second direct-current stabilized power supply 116 realize power supply redundancy, and when one path of power supply equipment fails, the other path of power supply equipment can be used, so that the continuity of power supply is ensured, and the reliability of power supply is improved.
Specifically, the first UPS power source 113 is connected to a first dc regulated power source 115 through a no-load a1, the second UPS power source 114 is connected to a second dc regulated power source 116, and the first dc regulated power source 115 and the second dc regulated power source 116 convert ac 220V into dc 24V; the output ends of the first dc regulated power supply 115 and the second dc regulated power supply 116 are connected to the input end of the power redundancy module 117 through the air switch a 2; the output terminal of the power redundancy module 117 supplies power to the first signal isolator 101 and the second signal isolator 102 through the corresponding terminal row A3 and the dummy switch a 4.
The types and specifications of the first pressure transmitter 101 and the second pressure transmitter 102 are completely the same, so that instrument redundancy is realized, the reliability of top pressure signal acquisition is improved, and when one pressure transmitter fails, the top pressure acquired by the other pressure transmitter can be used.
The first pressure transmitter 101 is connected to a first signal isolator 107 and the second pressure transmitter 102 is connected to a second signal isolator 108; the first signal isolator 107 and the second signal isolator 108 are both devices with one signal input and two signal outputs, so that the output redundancy of the top pressure signal is realized, and the reliability of the signal output is improved.
Specifically, the first pressure transmitter 101 inputs a signal to the first signal isolator 107, and then the first signal isolator 107 outputs a first top pressure B11 and a third top pressure B12; the second pressure transmitter 102 inputs a signal to the second signal isolator 108, and then the second signal isolator 108 outputs the second pressing force C11 and the fourth pressing force C12.
With reference to fig. 1, the first top pressure B11 is input to the first input/output IO frame 109 of the pressure reducing valve set, and the third top pressure B12 is input to the first IO frame 111 of the differential pressure power generation; the second top pressure C11 is input to the first pressure reducing valve group input/output IO frame 110, and the fourth top pressure C12 is input to the differential pressure generation second IO frame 111. Therefore, the input redundancy of the top pressure signal is realized, and the reliability of signal input is further ensured.
Here, the pressure reducing valve block first input/output IO frame 109 and the second pressure reducing valve block first input/output IO frame 110 have the same structure, and each include: the system comprises a power supply module, a C network module and an analog quantity input module; the power module is used for supplying power to the pressure reducing valve group input/output IO frame, the AI module of the first input/output IO frame 109 of the pressure reducing valve group is used for receiving the first top pressure, and the AI module of the second pressure reducing valve group input/output IO frame 110 is used for receiving the second top pressure.
The pressure reducing valve group main frame 103 and the pressure reducing valve group auxiliary frame 104 have the same structure, and both comprise: the system comprises a power supply module, a first controller, a network C module, a network E module and a redundancy module; wherein the content of the first and second substances,
the power supply module is used for supplying power to the pressure reducing valve group main frame 103 and the pressure reducing valve group auxiliary frame 104;
the first controller is used for determining a first target top pressure from the first top pressure and the second top pressure based on a preset control strategy;
the C-network module of each pressure reducing valve group rack is used for realizing the mutual communication among the pressure reducing valve group main rack 103, the pressure reducing valve group slave rack 104, the pressure reducing valve group first input/output IO rack 109 and the second pressure reducing valve group input/output IO rack 110; the pressure reducing valve block main frame 103 can receive the first pressing pressure B11 sent by the pressure reducing valve block first input and output IO frame 109 and the second pressing pressure C11 sent by the pressure reducing valve block second IO frame 110.
The E network module is connected with an external switch and used for sending the top pressure data to an industrial personal computer of the ring network to realize monitoring, configuration and the like of the top pressure data. The E-network module of the pressure reducing valve group main frame 103 is connected to the first exchanger 118, and the E-network module of the pressure reducing valve group slave frame 104 is connected to the second exchanger 119.
The redundancy between the pressure reducing valve group main frame 103 and the pressure reducing valve group slave frame 104 can be realized by the redundancy modules of the pressure reducing valve group main frame 103 and the pressure reducing valve group slave frame 104, the redundancy modules of the pressure reducing valve group slave frame 104 can monitor whether the pressure reducing valve group main frame 103 fails, if so, the pressure reducing valve group slave frame 104 is switched to work, and the furnace condition can be effectively adjusted.
It should be noted that the pressure reducing valve group main frame 103 and the pressure reducing valve group slave frame 104 may also detect whether the controller itself and the other side have a fault, and if the controller has a fault, the other side frame may obtain a fault message. Such as: when the redundant module or the controller of the pressure reducing valve group main frame 103 detects that the pressure reducing valve group main frame 103 has a fault, the pressure reducing valve group automatically acquires the fault message of the controller of the pressure reducing valve group main frame 103 from the controller of the frame 104, and after receiving the fault message from the controller of the frame 104, the pressure reducing valve group can be automatically switched to work to take over the pressure reducing valve group main frame 103 for working, so that the pressure of the furnace top can be effectively adjusted.
In the embodiment of the present invention, the differential pressure power generation first IO frame 111 and the differential pressure power generation second IO frame 112 have the same structure, and both include: the system comprises a power supply module, a C network module and an analog quantity input module; the power supply module is used for supplying power to the corresponding differential pressure power generation IO frame, and the AI module of the differential pressure power generation first IO frame 111 is used for receiving third top pressure; the AI module of the differential pressure power generation second IO frame 112 is configured to receive the fourth top pressure.
The differential pressure power generation main frame 105 and the differential pressure power generation slave frame 106 have the same structure, and both include: the system comprises a power supply module, a second controller, a network C module, a network E module and a redundancy module;
the power supply module is used for supplying power to the differential pressure power generation main frame 105 and the differential pressure power generation auxiliary frame 106;
the second controller is used for determining a second target top pressure from the third top pressure and the fourth top pressure based on a preset control strategy;
the C-network module of each differential pressure generator frame is used for realizing the mutual communication among the differential pressure generation first IO frame 111, the differential pressure generation second IO frame 112, the differential pressure generation main frame 105 and the differential pressure generation slave frame 106; therefore, the differential pressure power generation main frame 105 can receive the third top pressure transmitted by the differential pressure power generation first IO frame 111 and the fourth top pressure transmitted by the differential pressure power generation second IO frame 112.
The E-network module of the differential pressure power generation main frame 105 is connected with the third exchanger 120, and the E-network module of the differential pressure power generation slave frame 106 is connected with the fourth exchanger 121, so that corresponding top pressure data can be sent to an industrial personal computer of a ring network, and monitoring, configuration and the like of the top pressure data are realized.
The redundancy between the differential pressure power generation main frame 105 and the differential pressure power generation auxiliary frame 106 can be realized by the redundancy modules of the differential pressure power generation main frame 105 and the differential pressure power generation auxiliary frame 106, the redundancy modules of the differential pressure power generation auxiliary frame 106 can monitor whether the differential pressure power generation main frame 105 fails, if the differential pressure power generation main frame 105 fails, the differential pressure power generation auxiliary frame 106 is switched to work, and the furnace condition can be effectively adjusted.
It should be noted that the controllers of the differential pressure power generation master frame 105 and the differential pressure power generation slave frame 106 may detect whether or not the own and the counterpart frames are out of order, and if so, may send a failure message to the counterpart generator frame. For example, if the controller of the differential pressure power generation main frame 105 detects that the controller of the differential pressure power generation slave frame 106 has a fault, the controller of the differential pressure power generation slave frame 106 automatically acquires a fault message of the controller of the differential pressure power generation main frame 105, and when the differential pressure power generation slave frame 106 receives the fault message, the controller of the differential pressure power generation slave frame is switched to enter a working state to take over the differential pressure power generation slave frame 106, so that the pressure of the furnace top can be effectively adjusted.
Further, the first switch 118, the second switch 119, the third switch 120, and the fourth switch 121 are connected to the main switch 122 through optical fibers, so as to implement interaction of top pressure data.
Here, the system of this embodiment further includes switches 123 of other posts, such as a hot blast stove, a dry dedusting system, and the like (not listed here), and these switches can send the real-time data collected by the corresponding posts to the ring network, so that the workers can check, analyze, and control the real-time data, thereby implementing data interaction.
In order to improve the reliability of the control system, the industrial personal computers in the embodiment of the present invention are also redundant, that is, the embodiment includes a master industrial personal computer 124 and a slave industrial personal computer 125, the master switch 122 is respectively connected to the master industrial personal computer 124 and the slave industrial personal computer 125 through an ethernet, and an operator can perform operations such as data monitoring, instruction sending, and the like on a human-computer interface of each industrial personal computer.
Based on the same inventive concept as the previous embodiment, the embodiment of the present invention further provides a method for controlling the top pressure of the blast furnace, as shown in fig. 2, the method includes the following steps:
s210, receiving a first top pressure sent by a first input/output (IO) rack of the pressure reducing valve bank and a second top pressure sent by a second IO rack of the pressure reducing valve bank by using a main rack of the pressure reducing valve bank; the first top pressure is output by a first signal isolator, the input end of the first signal isolator is connected with a first pressure sensor, the second top pressure is output by a second signal isolator, and the input end of the second signal isolator is connected with a second pressure sensor;
s211, receiving third top pressure sent by a first differential pressure generation IO frame and fourth top pressure sent by a second differential pressure generation IO frame by using a differential pressure generation main frame; the third top pressure is output by the first signal isolator, the input end of the first signal isolator is connected with the first pressure sensor, the fourth top pressure is output by the second signal isolator, and the input end of the second signal isolator is connected with the second pressure sensor;
s212, determining a first target top pressure from the first top pressure and the second top pressure based on a preset control strategy for the main frame of the pressure reducing valve bank, and sending the first target top pressure to the main frame of the differential pressure power generation;
s214, determining a second target top pressure from the third top pressure and the fourth top pressure based on a preset control strategy for the differential pressure power generation main frame, and sending the second target top pressure to the pressure reduction valve group main frame;
and S215, taking the first target top pressure or the second target top pressure as a target top pressure participating in pressure regulation.
Specifically, as described above, the pressure reducing valve bank main frame may receive the first top pressure sent by the first input/output IO frame of the pressure reducing valve bank and the second top pressure sent by the second IO frame of the pressure reducing valve bank, and then a first target top pressure participating in the adjustment of the furnace top pressure needs to be selected from the first top pressure and the second top pressure, and then the first target top pressure is determined from the first top pressure and the second top pressure based on a preset control strategy, including:
judging whether the first top pressure and the second top pressure meet a preset target pressure threshold value or not;
if the first top pressure is determined to meet the target pressure threshold value and the second top pressure is determined not to meet the target pressure threshold value, determining the first top pressure as the first target top pressure;
and if the first top pressure is determined not to meet the target pressure threshold and the second top pressure meets the target pressure threshold, determining the second top pressure as the first target top pressure.
In the embodiment of the present invention, the determining whether the first pressing force and the second pressing force satisfy a preset target pressure threshold includes:
acquiring a first difference value between the first top pressure and a target pressure threshold value and a second difference value between the second top pressure and the target pressure threshold value;
if the absolute value of the first difference is determined to be within the preset pressure range, determining that the first top pressure meets a target pressure threshold; if the absolute value of the first difference is determined not to be within the preset pressure range, determining that the first top pressure does not meet the target pressure threshold;
if the absolute value of the second difference value is determined to be within the preset pressure range, determining that the second top pressure meets the target pressure threshold; and if the absolute value of the second difference is determined not to be within the preset pressure range, determining that the second top pressure does not meet the target pressure threshold.
The first top pressure and the second top pressure are actual pressures of the blast furnace in operation.
For example, if the first pressing pressure is, for example, 262Kpa, the target pressure threshold and the pressure range is 5 to 8Kpa, and if the first pressing pressure is 263Kpa, the absolute value of the first difference is 1Kpa, it is determined that the first pressing pressure satisfies the target pressure threshold. The target pressure threshold may be determined according to an actual process, and is not limited herein.
Optionally, if it is determined that both the first pressing force and the second pressing force meet the preset target pressure threshold, the method further includes:
determining a first pressure difference value of the first top pressure and the second top pressure;
and judging whether the first pressure difference value meets a preset pressure range, and if the first pressure difference value meets the preset pressure range, taking the average value of the first top pressure and the second top pressure as a first target top pressure.
And if the first pressure difference value does not meet the preset pressure range, taking the larger top pressure value of the first top pressure and the second top pressure as the first target top pressure. That is, if the first top pressure is greater than the second top pressure, the first top pressure is used as the first target top pressure, and if the first top pressure is less than the second top pressure, the second top pressure is used as the first target top pressure.
It should be noted that the pressure reducing valve group main frame and the differential pressure generating main frame work simultaneously, that is, when the pressure reducing valve group main frame determines the first target top pressure, the differential pressure generating main frame determines the second target top pressure based on the third top pressure and the fourth top pressure at the same time.
Similarly, the differential pressure power generation main frame determines a second target top pressure based on the third top pressure and the fourth top pressure, and the method comprises the following steps:
judging whether the third top pressure and the fourth top pressure meet a preset target pressure threshold value or not;
if the third top pressure is determined to meet the target pressure threshold and the fourth top pressure is determined not to meet the target pressure threshold, determining the third top pressure as a second target top pressure;
and if the third top pressure is determined not to meet the target pressure threshold and the fourth top pressure meets the target pressure threshold, determining the fourth top pressure as the second target top pressure.
In the embodiment of the present invention, the determining whether the third pressing force and the fourth pressing force satisfy the preset target pressure threshold includes:
acquiring a third difference value between the third top pressure and a target pressure threshold value and a fourth difference value between the fourth top pressure and the target pressure threshold value;
if the absolute value of the third difference value is determined to be within the preset pressure range, determining that the first top pressure meets the target pressure threshold; if the absolute value of the third difference is determined not to be within the preset pressure range, determining that the first top pressure does not meet the target pressure threshold;
if the absolute value of the fourth difference is determined to be within the preset pressure range, determining that the second top pressure meets the target pressure threshold; and if the absolute value of the fourth difference is determined not to be within the preset pressure range, determining that the second top pressure does not meet the target pressure threshold.
And the third top pressure and the fourth top pressure are actual pressures in the operation of the blast furnace.
For example, if the target pressure threshold is 262Kpa and the pressure range is 5-8 Kpa, and if the first top pressure is 265Kpa and the absolute value of the first difference is 3Kpa, it is determined that the third top pressure satisfies the target pressure threshold.
Optionally, if it is determined that both the third pressing force and the fourth pressing force meet the preset target pressure threshold, the method further includes:
determining a second pressure difference value of the third top pressure and the fourth top pressure;
and judging whether the second pressure difference value meets a preset pressure range, and if the second pressure difference value meets the preset pressure range, taking the average value of the third top pressure and the fourth top pressure as a second target top pressure.
And if the second pressure difference value does not meet the preset pressure range, taking the larger top pressure value in the third top pressure and the fourth top pressure as the second target top pressure. That is, if the third top pressure is greater than the fourth top pressure, the third top pressure is used as the second target top pressure, and if the third top pressure is less than the fourth top pressure, the fourth top pressure is used as the second target top pressure.
Further, the pressure reducing valve bank main frame is communicated with the differential pressure generating main frame in real time, the pressure reducing valve bank main frame can send the determined first target top pressure to the differential pressure generating main frame, and the differential pressure generating main frame can send the determined second target top pressure to the pressure reducing valve bank main frame.
In the embodiment of the invention, if the first top pressure, the second top pressure, the third top pressure and the fourth top pressure all meet the preset target pressure threshold, and the first pressure difference value and the second pressure difference value meet the preset pressure range, the condition of the blast furnace is stable at the moment, the numerical values of the first pressure sensor and the second pressure sensor are normal, the signal channel has no fault, and the accurate and stable control of the furnace top pressure is considered, so that the average pressure value is adopted to participate in the automatic control of the furnace top pressure, and the control accuracy is improved.
If the first pressure difference value and the second pressure difference value do not meet the preset pressure range, the condition of the blast furnace is unstable at the moment, and therefore the automatic control of the top pressure of the furnace is involved by the top pressure value with larger pressure, and the control precision is improved.
And after the first target top pressure and the second target top pressure are determined, determining the target top pressure participating in pressure regulation based on the first target top pressure and the second target top pressure.
Specifically, after the first target top pressure and the second target top pressure are determined, the pressure reducing valve bank main frame sends the first target top pressure to the main industrial personal computer, and the differential pressure power generation main frame sends the second target top pressure to the main industrial personal computer and displays the second target top pressure on a human-computer interface. At the moment, the working personnel can select the target top pressure participating in pressure regulation from the first target top pressure and the second target top pressure; if the main industrial personal computer receives the first target top pressure as the target top pressure to participate in pressure adjustment, the main frame of the pressure reducing valve bank takes the first target top pressure as the target top pressure to participate in pressure adjustment.
In addition, if the main frame of the pressure reducing valve bank detects that the first top pressure and the second top pressure do not meet the target pressure threshold, that is, the signal channels corresponding to the first top pressure and the second top pressure have faults, the main frame of the pressure reducing valve bank takes the second target top pressure as the target top pressure participating in the adjustment of the furnace top pressure.
Similarly, if the differential pressure power generation main frame detects that the third top pressure and the fourth top pressure do not meet the target pressure threshold, that is, the signal channels corresponding to the third top pressure and the fourth top pressure have faults, the differential pressure power generation main frame takes the first target top pressure as the target top pressure participating in the adjustment of the furnace top pressure.
If the first top pressure, the second top pressure, the third top pressure and the fourth top pressure do not meet the target pressure threshold value, namely the signal channels corresponding to the first top pressure, the second top pressure, the third top pressure and the fourth top pressure all have faults, the human-computer interface of the main industrial personal computer receives prompt information of 'equipment fault, and halt is recommended'.
Further, the method further comprises:
monitoring whether the pressure reducing valve bank main frame fails or not by utilizing a redundant module and a controller of the pressure reducing valve bank main frame or the pressure reducing valve bank slave frame, and automatically and undisturbed switching the pressure reducing valve bank main frame to the pressure reducing valve bank slave frame if the pressure reducing valve bank main frame fails.
Monitoring whether the differential pressure power generation main frame breaks down or not by using a redundant module and a controller of the differential pressure power generation slave frame, and automatically switching the differential pressure power generation main frame to the differential pressure power generation slave frame without disturbance if the differential pressure power generation controller breaks down.
Therefore, the embodiment of the invention improves the stability of the furnace top pressure signal by redundantly arranging the pressure sensor, the signal isolator, the pressure reducing valve group frame and the differential pressure generator frame, and can ensure that an effective top pressure signal is acquired even if one path of equipment fails in the actual production process because each equipment has corresponding redundant equipment, thereby effectively participating in the regulation of the furnace top pressure and ensuring the stability of the furnace condition.
The method and the system for controlling the top pressure of the blast furnace provided by the embodiment of the invention have the following beneficial effects that:
the embodiment of the invention provides a method and a system for controlling the top pressure of a blast furnace, wherein the method comprises the following steps: receiving a first top pressure sent by a first IO frame of the pressure reducing valve bank and a second top pressure sent by a second IO frame of the pressure reducing valve bank by using a main frame of the pressure reducing valve bank; the first top pressure is output by a first signal isolator, the input end of the first signal isolator is connected with a first pressure sensor, the second top pressure is output by a second signal isolator, and the input end of the second signal isolator is connected with a second pressure sensor; receiving a third top pressure sent by a first differential pressure generation IO frame and a fourth top pressure sent by a second differential pressure generation IO frame by using a differential pressure generation main frame; the third top pressure is output by the first signal isolator, the input end of the first signal isolator is connected with the first pressure sensor, the fourth top pressure is output by the second signal isolator, and the input end of the second signal isolator is connected with the second pressure sensor; determining a first target top pressure from the first top pressure and the second top pressure based on a preset control strategy for the main frame of the pressure reducing valve bank, and sending the first target top pressure to the main frame of the differential pressure power generation; determining a second target top pressure from the third top pressure and the fourth top pressure based on a preset control strategy and sending the second target top pressure to the pressure-reducing valve group main frame aiming at the differential pressure power generation main frame; determining a target top pressure participating in pressure regulation based on the first target top pressure and the second target top pressure; therefore, instrument redundancy is realized by utilizing the two pressure sensors, four paths of jacking signals can be simultaneously output by the two signal isolators in a one-in two-out mode, signal output redundancy is realized, and the reliability of jacking signal output is ensured; two paths of top pressure signals output by each signal isolator respectively enter different IO racks (a pressure reducing valve group IO rack and a differential pressure generation IO rack), so that input redundancy of the signals is realized; therefore, even if one path of equipment fails in the actual production process, the equipment can acquire effective top pressure signals due to the fact that corresponding redundant equipment exists in each equipment, and can further effectively participate in furnace top pressure regulation and ensure stable furnace conditions.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (4)
1. A method of controlling blast furnace top pressure, the method comprising:
receiving a first top pressure sent by a first input/output (IO) rack of the pressure reducing valve group and a second top pressure sent by a second IO rack of the pressure reducing valve group by using a main rack of the pressure reducing valve group; the first top pressure is output by a first signal isolator, the input end of the first signal isolator is connected with a first pressure sensor, the second top pressure is output by a second signal isolator, and the input end of the second signal isolator is connected with a second pressure sensor;
receiving a third top pressure sent by a first differential pressure generation IO frame and a fourth top pressure sent by a second differential pressure generation IO frame by using a differential pressure generation main frame; the third top pressure is output by the first signal isolator, the input end of the first signal isolator is connected with the first pressure sensor, the fourth top pressure is output by the second signal isolator, and the input end of the second signal isolator is connected with the second pressure sensor;
determining a first target top pressure from the first top pressure and the second top pressure based on a preset control strategy for the main frame of the pressure reducing valve bank, and sending the first target top pressure to the main frame of the differential pressure power generation;
determining a second target top pressure from the third top pressure and the fourth top pressure based on a preset control strategy and sending the second target top pressure to the pressure-reducing valve group main frame aiming at the differential pressure power generation main frame;
determining a target top pressure participating in pressure regulation based on the first target top pressure and the second target top pressure;
the determining of the first target top pressure from the first top pressure and the second top pressure based on the preset control strategy comprises the following steps:
judging whether the first top pressure and the second top pressure meet a preset target pressure threshold value or not;
if the first top pressure is determined to meet the target pressure threshold and the second top pressure is determined not to meet the target pressure threshold, determining the first top pressure as the first target top pressure;
if the first top pressure is determined not to meet the target pressure threshold and the second top pressure meets the target pressure threshold, determining the second top pressure as the first target top pressure;
if it is determined that the first pressing force and the second pressing force both meet the preset target pressure threshold, the method further comprises the following steps:
determining a first pressure difference value of the first top pressure and the second top pressure;
judging whether the first pressure difference value meets a preset pressure range or not, and if the first pressure difference value meets the preset pressure range, taking the average value of the first top pressure and the second top pressure as the first target top pressure;
if the first pressure difference value is determined not to meet the preset pressure range, taking the larger top pressure value of the first top pressure and the second top pressure as the first target top pressure;
and if the first top pressure and the second top pressure are determined to not meet the target pressure threshold value, taking the second target top pressure as the target top pressure participating in the adjustment of the furnace top pressure.
2. The method of claim 1, wherein the method further comprises:
and monitoring whether the main frame of the pressure reducing valve bank fails, and if the main frame of the pressure reducing valve bank fails, switching the main frame of the pressure reducing valve bank to a slave frame of the pressure reducing valve bank.
3. The method of claim 1, wherein the method further comprises:
and monitoring whether the differential pressure power generation main frame breaks down or not, and if the differential pressure power generation main frame breaks down, switching the differential pressure power generation main frame to a differential pressure power generation slave frame.
4. A blast furnace top pressure control system, comprising:
the pressure reducing valve bank main frame is used for receiving first top pressure sent by a first IO (input/output) frame of the pressure reducing valve bank and second top pressure sent by a second IO frame of the pressure reducing valve bank; determining a first target top pressure from the first top pressure and the second top pressure based on a preset control strategy, and sending the first target top pressure to the differential pressure power generation main frame; the first top pressure is output by a first signal isolator, the input end of the first signal isolator is connected with a first pressure sensor, the second top pressure is output by a second signal isolator, and the input end of the second signal isolator is connected with a second pressure sensor;
the differential pressure power generation main frame is used for receiving third top pressure sent by a first differential pressure power generation IO frame and fourth top pressure sent by a second differential pressure power generation IO frame; determining a second target top pressure from the third top pressure and the fourth top pressure based on a preset control strategy, and sending the second target top pressure to the main frame of the pressure reducing valve group; the third top pressure is output by the first signal isolator, the input end of the first signal isolator is connected with the first pressure sensor, the fourth top pressure is output by the second signal isolator, and the input end of the second signal isolator is connected with the second pressure sensor;
the pressure reducing valve group main frame or the differential pressure power generation main frame is also used for: determining a target top pressure participating in pressure regulation based on the first target top pressure and the second target top pressure;
the pressure reducing valve bank main frame is specifically used for:
judging whether the first top pressure and the second top pressure meet a preset target pressure threshold value or not;
if the first top pressure is determined to meet the target pressure threshold and the second top pressure is determined not to meet the target pressure threshold, determining the first top pressure as the first target top pressure;
if the first top pressure is determined not to meet the target pressure threshold and the second top pressure meets the target pressure threshold, determining the second top pressure as the first target top pressure;
if it is determined that the first top pressure and the second top pressure both meet a preset target pressure threshold, the main frame of the pressure reducing valve bank is further configured to:
determining a first pressure difference value of the first top pressure and the second top pressure;
judging whether the first pressure difference value meets a preset pressure range or not, and if the first pressure difference value meets the preset pressure range, taking the average value of the first top pressure and the second top pressure as the first target top pressure;
if the first pressure difference value is determined not to meet the preset pressure range, taking the larger top pressure value of the first top pressure and the second top pressure as the first target top pressure;
and if the first top pressure and the second top pressure are determined not to meet the target pressure threshold value, taking the second target top pressure as the target top pressure participating in the adjustment of the furnace top pressure.
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