A Dual-Limit Redundancy Detection and Control Method for the Valve Position Signal of a Blast Furnace Bunker

Abstract

The present invention discloses a dual-limit redundant detection and control method for the position signal of the blast furnace bunker valve, which relates to the technical field of blast furnace burden distribution control. The method includes: obtaining the main limit detection signal and the standby limit detection signal at each position detection point of the blast furnace bunker valve; performing signal selection on the main limit detection signal and the standby limit detection signal to achieve centralized output of the position signal, including: when the detection values of the main limit detection signal and the standby limit detection signal are consistent, automatically output without redundant switching judgment; when the detection values of the main limit detection signal and the standby limit detection signal are inconsistent, the signal is output through redundant automatic selection of the output signal or manual screen control; inputting the centralized output value of the position signal into the charging and / or burden distribution control program for charging and / or burden distribution control. The method in the present invention uses dual limits to detect the same position, with higher reliability; the limit output is selected through the upper computer, and the operation is fast and simple.

Description

Technical Field

[0001] The present invention relates to the technical field of blast furnace burden distribution control, and particularly to a dual-limit redundant detection and control method for the position signal of the blast furnace bunker valve. Background Art

[0002] The raw fuels required for blast furnace smelting are transported to the furnace top through the main belt, and the charging system of one coke and one ore is implemented, and the entire production process runs fully automatically.

[0003] After the blast furnace sends a material request signal, the intermediate hopper in the ore and coke bins automatically discharges materials, and the materials are transported to the furnace top through the main belt. When the leading end of the materials reaches the "OK" point, the program automatically judges whether the charging conditions are met. If the charging conditions are not met, the main belt operation will be automatically stopped. If the conditions are met, the materials can be loaded into the bunker. Before charging, the program automatically judges whether the charging conditions are met. If the conditions are not met, the program will automatically send a "forbidden to open the lower seal" signal to stop charging. The signal detection of the bunker valve position relies on proximity switches, which causes the following problems:

[0004] (1) Frequent failures and long processing time of proximity switches: There are 18 position signals directly controlling the charging and burden distribution of the blast furnace. Due to the large vibration at the furnace top, the proximity switches often get damaged or loose, resulting in failures. The processing time for a single failure is more than 20 minutes.

[0005] (2) Interruption of blast furnace feeding or charging, resulting in low stock line in the blast furnace: The number of batches of materials per hour in the blast furnace is 9 batches (18 bunker loads). During the processing of extreme failures, it is easy to cause a low stock line in the blast furnace.

[0006] (3) High pressure and tight maintenance time for furnace top maintenance and repair: Maintenance personnel need to enter the blast furnace top to handle the failures in the first place, with high safety risks and tight operation time.

[0007] (4) Low operability at the post, prone to causing operation accidents: After extreme failures, the post personnel need to force the signals on the upper computer according to the process conditions and then perform manual operations, which is not only cumbersome but also prone to operation accidents. Summary of the Invention

[0008] In view of this, the present invention provides a dual-limit redundant detection and control method for the position signal of the blast furnace bunker valve to improve the reliability of the position signal detection of the blast furnace bunker valve and reduce the impact of failures on blast furnace production.

[0009] For this purpose, the present invention provides the following technical solutions:

[0010] The present invention provides a dual-limit redundant detection and control method for the position signal of the blast furnace bunker valve, and the method includes:

[0011] Obtain the main limit detection signal and the backup limit detection signal at each position detection point of the blast furnace bunker valve;

[0012] Send the main limit detection signal and the backup limit detection signal to the input module of the DCS system;

[0013] Perform signal selection on the main limit detection signal and the backup limit detection signal to achieve centralized output of position signals; among them, performing signal selection on the main limit detection signal and the backup limit detection signal includes: when the detection values of the main limit detection signal and the backup limit detection signal are consistent, automatically output without redundant switching judgment; when the detection values of the main limit detection signal and the backup limit detection signal are inconsistent, the output of the signal is selected through redundant automatic selection or manual screen control;

[0014] Input the centralized output value of the position signal into the charging and / or burden distribution control program for charging and / or burden distribution control.

[0015] Furthermore, the redundant automatic selection of the output signal includes: the program automatically and correctly selects the output of the main limit detection signal and the backup limit detection signal according to the process state to achieve redundant control.

[0016] Furthermore, the program automatically and correctly selects the output of the main limit detection signal and the backup limit detection signal according to the process state, including: the displacement of the oil cylinder detected by the oil cylinder magnetostrictive displacement sensor is greater than 420 mm; the corresponding oil cylinder pressure is greater than 12 MPa, then select the proximity switch with a detection value of 1 among the main limit detection signal and the backup limit detection signal for control.

[0017] Furthermore, the manual screen control for signal output includes: directly select the output of the limit signal through the selection button on the screen.

[0018] Furthermore, obtaining the main limit detection signal and the backup limit detection signal at each position detection point of the blast furnace bunker valve includes:

[0019] Install two proximity switches at each position detection point of the blast furnace bunker valve, and use the two proximity switches to detect the position signal to obtain the main limit detection signal and the backup limit detection signal.

[0020] Furthermore, the two proximity switches are horizontally arranged and fixedly installed, and at the same time, the area of the proximity body is increased so that the two detection points can be synchronously sensed.

[0021] Furthermore, sending the main limit detection signal and the backup limit detection signal to the input module of the DCS system includes:

[0022] Lay cables to transmit the main limit detection signal and the backup limit detection signal into the input module of the DCS system.

[0023] Advantages and positive effects of the present invention: A dual-limit redundancy detection and control method for the position signal of the blast furnace bunker valve provided by the present invention obtains the main limit detection signal and the backup limit detection signal at each position detection point of the blast furnace bunker valve; sends the main limit detection signal and the backup limit detection signal to the input module of the DCS system; performs signal selection on the main limit detection signal and the backup limit detection signal to achieve centralized output of the position signal; among them, performing signal selection on the main limit detection signal and the backup limit detection signal includes: when the detection values of the main limit detection signal and the backup limit detection signal are consistent, automatically output without performing redundant switching judgment; when the detection values of the main limit detection signal and the backup limit detection signal are inconsistent, the output signal is selected through redundant automatic selection or manual screen control; inputs the centralized output value of the position signal into the charging and / or feeding control program for charging and / or feeding control. This method uses dual limits to detect the same position, with higher reliability; the limit output is selected through the upper computer, and the operation is fast and simple. Using the control method of the present invention, the influence time of a single limit failure can be reduced from more than 20 minutes to within 1 minute, avoiding the interruption of blast furnace charging and feeding caused by limit signal failures, while reducing the work pressure of maintenance personnel and improving the operability of on-site personnel. Brief Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 Schematic diagram of the electrical control circuit and signal circuit of the proximity switch in the embodiment of the present invention;

[0026] Figure 2 Flowchart of a dual-limit redundancy detection and control method for the position signal of the blast furnace bunker valve in the embodiment of the present invention;

[0027] Figure 3 Schematic diagram of the redundant limit detection control logic in the embodiment of the present invention;

[0028] Figure 4 Schematic diagram of the operation screen for selecting the limit signal output in the embodiment of the present invention. Detailed Embodiments

[0029] To enable those skilled in the art to better understand the solution of the present invention, 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 a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0031] In the embodiment of the present invention, each position detection point of the blast furnace bunker valve includes two proximity switches, that is, one proximity switch is added at each position detection point. During specific installation, the first proximity switch (original proximity switch) and the second proximity switch (newly added proximity switch) are horizontally arranged and fixedly installed, and at the same time, the area of the proximity body is increased so that the two detection points can be synchronously sensed. An independent electrical control circuit and a signal circuit are designed for the newly added proximity switch, and the detection signal is transmitted into the DCS system, as Figure 1 shown. In specific implementation, cables are laid to transmit the signal into the input module of the DCS system, and the channels are defined. The original limit is defined as the "main control limit", and the newly added limit is defined as the "standby limit". By adding a standby limit switch, double-point detection is realized for each position signal of the blast furnace bunker valve.

[0032] A double-limit redundancy detection control method for the position signal of the blast furnace bunker valve in the embodiment of the present invention realizes centralized output of double-point detection by writing a redundancy control program. Specifically, through logic control blocks such as SR flip-flops, etc., to control whether to use the standby limit signal or the main control limit signal as the output; then use the centralized output value of each valve position signal to replace the original limit signal detection point to control the charging / discharging. As Figure 2 shown, the double-limit redundancy detection control method for the position signal of the blast furnace bunker valve includes the following steps:

[0033] S1. Detect the position signal using the first proximity switch and the second proximity switch to obtain the main / backup limit detection signal;

[0034] S2. Send the main / backup limit detection signal to the input module of the DCS system;

[0035] S3. Perform signal selection on the main / backup limit detection signal to achieve centralized output of the position signal;

[0036] Among them, performing signal selection on the main / backup limit detection signal is also redundant limit detection control, and there are two control methods: manually select the detection of the main / backup control limit as the control output; the program automatically and correctly selects the output of the main / backup limit according to the process status to achieve redundant control. As Figure 3 shown, taking the open position detection control of a single valve as an example, the redundant limit detection control logic includes:

[0037] The original limit detection signal is defined as "Signal 1", and the newly added backup limit detection signal is defined as "Signal 2". The automatic detection control is based on the following description:

[0038] When the detection values of "Signal 1" and "Signal 2" are the same, output automatically without making redundant switching judgments;

[0039] When the detection values of "Signal 1" and "Signal 2" are different, it is possible to select the redundant automatic selection of the output signal or the manual screen control to select the output of the signal.

[0040] Program automatic redundancy judgment: The displacement of the oil cylinder detected by the magnetostrictive displacement sensor of the oil cylinder is greater than 420 mm; the corresponding oil cylinder pressure is greater than 12 MPa, then select the proximity switch with a limit detection value of 1 in "Signal 1" and "Signal 2" for control. At this time, the control method is to select "program automatic redundancy judgment".

[0041] Screen manual control: Directly select the output of the limit signal through the selection button on the screen. At this time, the control method is selected as "screen manual control", as Figure 4 shown.

[0042] S4. Input the centralized output value of the position signal into the loading / unloading control program for loading / unloading control.

[0043] In the above-mentioned double-limit redundant detection control method for the position signal of the blast furnace bunker valve, using double limits to detect the same position has higher reliability; by selecting the limit output through the upper computer, the operation is fast and simple. Using the control method of the present invention, the influence time of a single limit failure can be reduced from more than 20 minutes to within 1 minute, avoiding the interruption of blast furnace loading and unloading caused by limit signal failures, while reducing the working pressure of maintenance personnel and improving the operability of on-site personnel.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A dual-limit redundant detection and control method for the position signal of the blast furnace bunker valve, characterized in that The method includes: Install two proximity switches at each position detection point of the blast furnace bunker valve, and use the two proximity switches to detect position signals to obtain a main limit detection signal and a standby limit detection signal; the two proximity switches are horizontally arranged and fixedly installed, and at the same time, the area of the proximity body is increased so that the two detection points can be synchronously sensed; Send the main limit detection signal and the standby limit detection signal to the input module of the DCS system; Perform signal selection on the main limit detection signal and the standby limit detection signal to achieve centralized output of position signals; among them, performing signal selection on the main limit detection signal and the standby limit detection signal includes: when the detection values of the main limit detection signal and the standby limit detection signal are the same, automatically output without redundant switching judgment; when the detection values of the main limit detection signal and the standby limit detection signal are different, the signal is output through redundant automatic selection of the output signal or manual screen control; the redundant automatic selection of the output signal includes: the displacement of the oil cylinder detected by the magnetostrictive displacement sensor of the oil cylinder is greater than 420 mm; the corresponding oil cylinder pressure is greater than 12 MPa, then select the proximity switch with a detection value of 1 among the main limit detection signal and the standby limit detection signal for control; Input the centralized output value of the position signal into the charging and / or distributing control program for charging and / or distributing control.

2. The double-limit redundancy detection and control method for the valve position signal of the blast furnace bunker according to claim 1, characterized in that The output of the signal by the manual screen control includes: directly select the output of the limit signal through the selection button on the screen.

3. A dual-limit redundant detection and control method for the position signal of a blast furnace bunker valve according to claim 2, characterized in that, Sending the main limit detection signal and the standby limit detection signal to the input module of the DCS system includes: Lay cables to transmit the main limit detection signal and the standby limit detection signal into the input module of the DCS system.

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