Classification control energy-saving method for steel coils for electrolytic cleaning

Abstract

The invention relates to a steel coil classification control energy-saving method for electrolytic cleaning, which comprises the following steps: step 1, recording production completion information of a transition coil in a process control system, step 2, setting calculation to judge and identify types, step 3, transmitting the identified types to basic automation in an electric text mode, and step 4, carrying out classification control on the identified types. And 4, the electrolytic rectifier carries out cleaning control switching. According to the scheme, the original production process is modified, the production record of the transition coil is reserved, control signals are transmitted by expanding control messages, the control signals of an electrolytic rectifier are added in a matched mode, and finally the steel coil classification control energy-saving method for electrolytic cleaning is completely achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to a control energy-saving method, in particular to a steel coil classification control energy-saving method for electrolytic cleaning, and belongs to the technical field of automatic production control of continuous annealing unit. BACKGROUND

[0002] Modern high-speed, continuous cold continuous rolling and annealing production line generally arranges cleaning process at the entrance of the unit, especially a section of electrolytic cleaning tank, which is used for cleaning the iron powder and grease on the surface of the strip steel, and is an indispensable production process.

[0003] Due to the continuous production characteristics of the continuous annealing production line, a large number of transition coils are often switched to realize the switching of different material specifications of the strip steel during the production process, which is also a necessary process production system. These transition coils are repeatedly used, and after the first cleaning, the surface iron powder and grease have been removed, and the subsequent multiple cleanings are meaningless, resulting in waste of electric energy. According to preliminary statistics, the unit uses about 1069 return coils per year, and the total power consumption of the cleaning section reaches 288,000 degrees. Therefore, the present application discloses an electrolytic cleaning steel coil classification control energy-saving technology, which aims to automatically record the production frequency of the steel coil and intelligently identify the type of the steel coil, and automatically open and close the flag to the electrolytic rectifier control system, and finally realize the automatic control of the electrolytic cleaning of different types.

[0004] After the novelty search, the invention patent "Electrolytic cleaning device and control method of electrolytic cleaning device" (CN201510801059.5) relates to an electrolytic cleaning device and a control method of the electrolytic cleaning device, which can preferentially inhibit the increase of the conveying resistance of the strip steel or preferentially remove the dirt of the strip steel according to the conveying state of the strip steel. The electrolytic cleaning device for cleaning the continuously conveyed strip steel has a vertical tank, a liquid amount adjusting unit and a control device. The vertical tank stores electrolyte for soaking the strip steel and contains an electrode plate for electrolyzing the electrolyte. The liquid amount adjusting unit adjusts the amount of electrolyte in the vertical tank by discharging the electrolyte outside the vertical tank and supplying the electrolyte to the electrolyte in the vertical tank. The control device reduces the amount of electrolyte in the vertical tank when the conveying resistance of the strip steel in the electrolyte increases, thereby lowering the liquid level of the electrolyte. In addition, the control device increases the amount of electrolyte in the vertical tank when the conveying resistance of the strip steel decreases, thereby raising the liquid level. The present application is completely different from the above-mentioned similar patent. SUMMARY

[0005] This invention addresses the problems in existing technologies, such as the lack of means to know the number of steel coil productions, the inability to intelligently identify coil types, and the inability to complete the transmission of primary and secondary control signals. Based on the principle that the return coil number remains unchanged, the production traces of the return coil are preserved in the process control system. Type recognition is added to the setting calculation stage, and the type is transmitted to the basic automation level through primary and secondary extended communication interfaces. Finally, the electrolytic rectifier realizes the automatic cleaning control function based on the type.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: an energy-saving method for classifying and controlling steel coils during electrolytic cleaning, characterized in that the method includes the following steps:

[0007] Step 1: Record the production completion information of the transition roll in the process control system.

[0008] Step 2: Set up calculations to perform type identification and recognition.

[0009] Step 3: The identified type is transmitted to the basic automation system via message.

[0010] Step 4: The electrolytic rectifier is switched to cleaning control.

[0011] Step 1, specifically recording the production completion information of the transition roll in the process control system, is as follows:

[0012] The L2 control system has a material table T_MU that records incoming steel coil information, including coil number, thickness, width, steel type, alloy content, and other raw data. Data in this table is periodically deleted; currently, it retains data from the last six months. If a coil from the last six months is being produced again, and the same coil number is found in the table, no new record is created; only the incoming material information corresponding to that coil number is updated.

[0013] To record whether a transitional coil is a duplicate production, after the steel coils produced on the production line are exported, they are identified according to their type. If it is a transitional coil, the number of records for that coil in the T_MU table is counted, and the latest coil number is appended with a suffix in the format "coil number_R**", where ** represents the number of productions, i.e., count+1.

[0014] Step 2: Set up the calculation for type identification, as follows:

[0015] The vast majority of production control data on-site comes from the secondary control system. When a steel coil moves onto the uncoiler, the primary system requests data from the secondary system. The request message number for uncoiler No. 1 is 2104, and the request message number for uncoiler No. 2 is 2105. This operation can also be manually triggered via the screen. After receiving the request, the secondary system triggers the setting calculation module STM. Based on the basic information of the incoming material, it uses a model to calculate control parameters, including tension, rolling force, elongation, etc. After completing these tasks, the steel coil type is determined according to the requirements of this invention. The method is to look up the information of the current coil in the T_MU table, lock the coil number suffix after finding it, determine the production frequency of the coil based on the suffix, and set the cleaning flag according to the frequency.

[0016] The steel coil is a formal coil and needs to be cleaned; the cleaning flag should be set to 1.

[0017] The steel coil is a transitional coil and is being used for the first time. It needs to be cleaned, so the cleaning flag should be set to 1.

[0018] The steel coil is a transitional coil, used more than once, and does not require cleaning; the cleaning flag should be set to 0.

[0019] The judgment result is saved to the Emodulus field of the setting table T_SET_DATA.

[0020] Step 3 involves transmitting the identified type of data to the basic automation system via electronic message, as detailed below.

[0021] To pass type information to basic automation, the existing setpoint interface needs to be extended. A suitable interface point needs to be found in the existing communication loop, and both sides need to communicate the message number, message content, field types, length, etc. After defining these parameters, a message assistant tool is used to generate header files and source files for manipulating the fields, which are then ported to the server. The organized message content undergoes high-low byte conversion to conform to machine-readable ASCII codes. The following are descriptions of some fields:

[0022]

[0023]

[0024] In step 4, the electrolytic rectifier undergoes a cleaning control switch, as detailed below.

[0025] Based on the existing remote start-up program logic of the cleaning section, an identification flag for the return coil information of the rectifier cabinet in the cleaning section is added to achieve automatic start-stop function. When the steel coil is detected to enter the channel electrolytic rectification, the basic automation control layer converts the auxiliary information into a control signal based on the return coil signal transmitted in step 3 and sends it to the electrolytic rectifier cabinet in the cleaning section. The rectifier cabinet control command is triggered by a pulse. When the control signal is on the rising edge, the electrolytic rectification start command is triggered, and when the control signal is on the falling edge, the electrolytic rectification stop command is triggered. At the same time, a control screen is added to manually select the start and stop signals of the rectifier cabinet. After manually selecting rectification to stop, the control signal (RectifierNotUseForCoilType) is locked to False. The field electrolytic rectification control cabinet will not receive this control signal and must be clicked to start before it can continue to be automatically put into use.

[0026] Compared to existing technologies, this invention has the following advantages: This technical solution, starting from the perspective of truly saving energy and reducing consumption for enterprises, breaks away from the control concepts inherited for over a decade. It uncovers the process characteristic that transition coils can be cleaned without cleaning in the cleaning section. By modifying the original production process, the production records of the transition coils are preserved, and by expanding the control messages, the control signals are successfully transmitted. Combined with the addition of control signals for the electrolytic rectifier, a complete energy-saving method for the classification control of steel coils during electrolytic cleaning is ultimately realized. According to statistics, a total of 1069 return coils were used in 2023, with an average length of 6000 meters per coil, a total unit operating time of 996.3 hours, and a power of 90KW per electrolytic rectifier, with a total of 4 sets of equipment. The application of this invention avoids this part of the electricity consumption; calculated at an electricity price of 0.8 yuan, it can save nearly 300,000 yuan annually. Attached Figure Description

[0027] Figure 1 Diagram showing the reception and transmission of electrolysis signals.

[0028] Figure 2 Flowchart of start-up and shutdown control for electrolytic rectifier Detailed Implementation

[0029] To enhance understanding of the present invention, the embodiments will be described in detail below with reference to the accompanying drawings.

[0030] Figure 1 This is a newly added electrical diagram for receiving and transmitting electrolysis signals. After the signals received in the secondary message are decomposed, the electrolysis control signals are converted into electrical signals by the control module corresponding to RectifierNotUseForCoilType and the electrolysis rectifier.

[0031] Figure 2This is a flowchart of the electrolytic rectifier start-stop control process in this invention. After receiving the data request from the primary stage, the secondary stage starts the calculation of the set value. After obtaining the set data values, it enters the cleaning flag judgment logic involved in this patent. After obtaining the cleaning control signal, it sends it to the primary stage, converts it into a control signal, and finally realizes the automatic control of cleaning.

[0032] Example: This invention has been applied to the continuous annealing unit of Meigang Steel with excellent results, effectively reducing power consumption. The control process is described step by step below:

[0033] Example: Incoming material roll number: 34126642700, Incoming material type: Transition roll

[0034] Step 1: Record the production completion information of the transition roll in the process control system;

[0035] After export production is completed, the steel coil type is first looked up in the T_PDI_PH table of the original incoming material data. The steel coil type is found to be 1, which is the transition coil.

[0036] The search results are:

[0037]

[0038] Next, we searched for the record corresponding to this roll number in the material list T_MU and found that it had been produced 14 times, and this was the 15th production run.

[0039]

[0040] Therefore, the first record is modified by adding the suffix "volume number_R15" to become "34126642700_R15".

[0041] Step 2: Set up calculations to determine and identify the type;

[0042] As shown in step 1, the steel coil is a transitional coil with a usage count > 1 and does not require cleaning. The cleaning flag Emodulus is set to 0. The following image shows the partial screen of the control settings for the steel coil to be used on-site.

[0043]

[0044] Step 3: The identified type is transmitted to the basic automation system via electronic message;

[0045] Communication between the two parties uses a static connection and the TCP / IP protocol. The data sent is composed of a file stream and needs to be converted from high to low bytes. The following figure shows the log record printed by the program after the transmission:

[0046]

[0047] Step 4: Switch the cleaning control for the electrolytic rectifier.

[0048] When a steel coil is detected entering the channel electrolytic rectification, the basic automation control layer will convert the return coil cleaning flag 0 from the secondary transmission in step 3 into a control signal value of 0, and find that the signal RectifierNotUseForCoilType in the manual control screen is True, confirming that the field electrolytic rectification control cabinet receives the control signal. Therefore, the control signal is a falling edge, triggering the electrolytic rectification shutdown command, and the coil will not be cleaned on site.

[0049] It should be noted that the above embodiments are not intended to limit the scope of protection of the present invention. Equivalent transformations or substitutions made based on the above technical solutions all fall within the scope of protection of the claims of the present invention.

Claims

1. A method for energy saving in the classification control of electrolytically cleaned steel coils, characterized in that, The method comprises the following steps: Step 1: recording production completion information of a transition coil in a process control system, Step 2: setting calculation to perform type judgment identification, Step 3: transmitting the identified type to basic automation in an electric text mode, Step 4: performing cleaning control switching of an electrolytic rectifier.

2. The method of claim 1, wherein the method is characterized by: The step 1: recording production completion information of a transition coil in a process control system is specifically as follows: There is a material table number T_MU in the L2 control system, which records incoming material information of a coil, including coil number, thickness, width, steel grade, and alloy content original data. The data in the table is periodically deleted. At present, the data within half a year is defined to be retained. If a transition coil is produced again within half a year, the incoming material information of the coil number is updated after the same coil number is found in the table, and the transition coil is not newly recorded. In order to record whether the transition coil is repeatedly produced, the coil produced on line is exported after production is completed. According to the type, the record count of the coil in the T_MU table is counted, and a suffix is added to the latest coil number. The format is "coil number_R**", wherein ** represents the production frequency, that is, count+1.

3. The method of claim 1, wherein the method is characterized by: Step 2: setting calculation to perform type judgment identification is specifically as follows: The production control data on site is mostly derived from the secondary control system. When the coil moves to the uncoiler, the primary control system requests data from the secondary control system. The secondary control system calculates control parameters including tension, rolling force, and elongation rate according to the basic information of the incoming material. After the calculation is completed, the information of the current coil is found from the T_MU table. After the coil number suffix is locked, the production frequency of the coil is judged according to the suffix, and the cleaning flag is set according to the frequency: The coil is a formal coil, and cleaning is required. The cleaning flag is set to 1. The coil is a transition coil and is used for the first time, and cleaning is required. The cleaning flag is set to 1. The coil is a transition coil and is used more than once, and cleaning is not required. The cleaning flag is set to 0. The judgment result is saved to the Emodulus field of the setting table T_SET_DATA.

4. The electrolytic cleaning coil sorting control energy saving method of claim 1, wherein, Step 3: transmitting the identified type to basic automation in an electric text mode is specifically as follows: In order to transmit the type to basic automation, the original setting value interface needs to be expanded. In the original communication return line, a suitable interface point is found. The electric text number, electric text content, field type, and length are communicated. After the definition is completed, the electric text helper tool is used to form a header file and a source file for operating the field, and is transplanted into the server. The high and low byte conversion of the organized electric text content is performed to conform to the ASCII code recognizable by the machine.

5. The electrolytic cleaning coil sorting control energy saving method of claim 1, wherein, Step 4 The electrolytic rectifier is cleaned and controlled to switch, and the specific method is as follows: in the program logic of the existing remote start cleaning section, a cleaning section rectifier cabinet identification return coil information flag is added to realize the automatic start-stop function; when it is detected that the steel coil enters the channel electrolytic rectifier, the basic automation control layer converts the auxiliary information into a control signal according to the return coil signal transferred in step 3, and sends it to the electrolytic rectifier cabinet of the cleaning section; the rectifier cabinet control command is triggered as a pulse, when the control signal is rising, the electrolytic rectifier opening command is triggered, and when the control signal is falling, the electrolytic rectifier closing command is triggered; at the same time, a new control screen is added, which can manually select the start-stop signal of the rectifier cabinet; after the rectifier is manually selected to stop, the control signal (RectifierNotUseForCoilType) is locked as False, and the field electrolytic rectifier control cabinet will not receive this control signal; after clicking on, the automatic use can continue.

Images