A pickling line rinsing water control method

Abstract

The embodiment of the present application provides a pickling line rinsing water control method, comprising the following steps: acquiring the liquid level and the conductivity of a rinsing device and the liquid level and the conductivity of a washing tower in real time; determining the water replenishing state of the rinsing device according to the liquid level change of the rinsing device, and judging whether the water replenishing state of the rinsing device is normal water replenishing; if it is judged that the water replenishing state of the rinsing device is normal water replenishing, then determining the rinsing water replenishing flow of the rinsing device according to the liquid level and the conductivity of the washing tower and the conductivity of the rinsing device.

Description

Technical Field

[0001] This invention relates to the field of pickling and rolling strip production, and particularly to a method for controlling rinsing water in a pickling line. Background Technology

[0002] In the production process of pickled steel strip, the rinsing water is controlled only by the liquid level. This often results in high conductivity of the rinsing water, leading to incomplete cleaning of the steel strip surface. This necessitates manually increasing the water supply, resulting in resource waste. Furthermore, within the industry, achieving high-quality rinsing and minimizing energy consumption and wastewater discharge are seemingly contradictory issues.

[0003] In the process of developing this invention, the applicant discovered at least the following problems in the prior art:

[0004] How to dynamically control and adjust the rinsing water to ensure good board quality while reducing environmental pressure and avoiding resource waste. Summary of the Invention

[0005] This invention provides a method for controlling rinsing water in an acid pickling line, which solves the problem of how to dynamically control and adjust rinsing water to ensure good board quality while reducing environmental pressure and avoiding resource waste.

[0006] To achieve the above objectives, in one aspect, embodiments of the present invention provide a method for controlling rinsing water in a pickling line, comprising:

[0007] Real-time acquisition of liquid level and conductivity of the rinsing device, as well as liquid level and conductivity of the washing tower;

[0008] Based on the liquid level change of the rinsing device, determine the water replenishment status of the rinsing device, and determine whether the water replenishment status of the rinsing device is normal water replenishment;

[0009] If it is determined that the water replenishment status of the rinsing device is normal, then the water replenishment flow rate of the rinsing device is determined based on the liquid level and conductivity of the washing tower and the conductivity of the rinsing device.

[0010] The water replenishment status of the rinsing device is determined according to the liquid level of the rinsing device, and the water replenishment status of the rinsing device includes normal water replenishment and rapid water replenishment.

[0011] The above technical solution has the following beneficial effects: By comprehensively analyzing the liquid level and conductivity, the water replenishment flow of the rinsing device is automatically adjusted and controlled, which meets the requirements of fully automatic control of rinsing water. At the same time, the conductivity of the rinsing water in the rinsing device is kept stable, ensuring the quality of the plate surface. The indicators are adjusted in a timely manner, avoiding problems such as excessive discharge and exceeding standards, creating good environmental value, meeting the requirements of energy conservation and emission reduction, and also creating certain economic benefits. After the project implementation test, it was found that the amount of demineralized water used can be reduced by 3,000 tons per month, the manufacturing cost of each ton of demineralized water is 4 yuan, and the annual cost reduction is 3,000 * 3 * 12 = 144,000 yuan. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a flowchart of a method for controlling rinsing water in an acid pickling line, one of the embodiments of the present invention;

[0014] Figure 2 This is a schematic diagram of the control logic of a pickling line rinsing water control method according to one embodiment of the present invention;

[0015] Figure 3 This is a rinsing water circulation diagram of a rinsing water control system for an acid pickling line, one of the embodiments of the present invention;

[0016] The attached diagram is labeled as follows: 1-5, rinsing tank 1-rinsing tank 5; 6, condensate tank; 7, flow control valve; 8, washing tower; 9, rinsing water tank; 10, demineralized water tank. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] The inventors discovered that in existing technologies, the use of industrial water in the rinsing process of the pickling section requires manual operation when abnormal indicators occur, and control is based solely on the liquid level. This results in incomplete cleaning of the steel strip surface and necessitates manually increasing the water supply, leading to resource waste. After analyzing and considering the problem of incomplete cleaning of the steel strip surface, the inventors found that the flow rate, liquid level, and conductivity of the industrial water in the rinsing process of the pickling section are all related to the cleaning cleanliness. The inventors have implemented an automatic control mode for indicators such as flow rate, liquid level, and conductivity to improve the utilization rate of industrial water and the stability of production while ensuring good cleaning of the strip surface.

[0019] On the one hand, such as Figure 1 As shown, an embodiment of the present invention provides a method for controlling rinsing water in a pickling line, comprising:

[0020] Step S10: Real-time acquisition of the liquid level and conductivity of the rinsing device, and the liquid level and conductivity of the washing tower;

[0021] Step S11: Determine the water replenishment status of the rinsing device based on the liquid level change of the rinsing device, and determine whether the water replenishment status of the rinsing device is normal water replenishment.

[0022] Step S12: If it is determined that the water replenishment status of the rinsing device is normal, then the water replenishment flow rate of the rinsing device is determined according to the liquid level and conductivity of the washing tower and the conductivity of the rinsing device.

[0023] The water replenishment status of the rinsing device is determined according to the liquid level of the rinsing device, and the water replenishment status of the rinsing device includes normal water replenishment and rapid water replenishment.

[0024] In some embodiments, the rinsing device is used to rinse and clean the strip surface. The purpose of rinsing is to remove residual acid from the strip after pickling. Pickling aims to remove iron oxide scale adhering to the surface of the strip, and rinsing is a post-pickling process. During rinsing, the flow rate of the rinsing water needs to be controlled according to specific circumstances. The rinsing device may include one or more rinsing tanks; preferably, multiple rinsing tanks are placed sequentially so that rinsing water flows through each rinsing tank sequentially through nozzles. Preferably, the rinsing water flows in from one end of the rinsing device and out from the other end; preferably, the liquid level and conductivity of the rinsing device are detected at the rinsing water outlet. The rinsing water outlet of the rinsing device is connected to the rinsing water inlet of the washing tower, and the rinsing water flowing out of the rinsing device flows into the washing tower. When the liquid level in the rinsing unit is too low, rapid water replenishment is required to protect production. This is the rapid water replenishment state. When the liquid level in the rinsing unit is within the normal range, the rinsing water flows in and out of the rinsing unit at the normal flow rate. At this time, the water replenishment state of the rinsing unit is normal. The specific values ​​for when the liquid level in the rinsing unit is too low or within the normal range can be determined based on the volume of the rinsing unit and the production process requirements. Under normal water replenishment conditions, the water replenishment flow rate of the rinsing device is determined based on the liquid level and conductivity of the washing tower and the rinsing device. Monitoring the conductivity allows for a more accurate assessment of whether the rinsing water has a good rinsing effect. When the rinsing effect in the rinsing device is good (low conductivity), a low water replenishment flow rate is used, relatively increasing the usage time of the rinsing water in the rinsing device, thus reducing the total amount of rinsing water used while ensuring rinsing effect. When the rinsing effect in the rinsing device is poor (high conductivity), the rinsing water replenishment flow rate is increased to promptly improve the rinsing effect and ensure plate quality. Simultaneously, based on conductivity monitoring, the rinsing water flow rate can be precisely controlled, avoiding inefficient water replenishment and achieving water-saving effects. Monitoring the conductivity of the washing tower allows for further precise control of the rinsing device's water replenishment flow rate; for example, when the conductivity of the washing tower exceeds a certain threshold, the rinsing device's water replenishment flow rate can also be increased.

[0025] The embodiments of the present invention have the following technical effects: by comprehensively analyzing the liquid level and conductivity, the water replenishment flow of the rinsing device is automatically adjusted and controlled, which meets the requirements of fully automatic control of rinsing water. At the same time, the conductivity of the rinsing water in the rinsing device is kept stable, ensuring the quality of the plate surface. The indicators are adjusted in a timely manner, avoiding problems such as excessive discharge and exceeding standards, creating good environmental protection value, meeting the requirements of energy conservation and emission reduction, and also creating certain economic benefits.

[0026] Further, determining the water replenishment status of the rinsing device based on the liquid level change of the rinsing device includes:

[0027] Real-time monitoring of the relationship between the liquid level of the rinsing device and the preset first rinsing liquid level and the preset second rinsing liquid level;

[0028] If the liquid level of the rinsing device is lower than the preset first rinsing liquid level, the water replenishment state of the rinsing device is set to rapid water replenishment and maintained in rapid water replenishment state until the liquid level of the rinsing device is greater than or equal to the preset second rinsing liquid level. Then, the water replenishment state of the rinsing device is set to normal water replenishment and maintained in normal water replenishment state until the liquid level of the rinsing device is lower than the preset first rinsing liquid level. This cycle is repeated.

[0029] Wherein, the preset second rinsing liquid level is greater than the preset first rinsing liquid level.

[0030] In some embodiments, the threshold for switching to rapid water replenishment is set to a preset first rinsing liquid level, and the threshold for switching to normal water replenishment is set to a preset second rinsing liquid level, where the preset second rinsing liquid level is greater than the preset first rinsing liquid level. Instead of using only one threshold as the switching boundary between rapid and normal water replenishment, this effectively avoids frequent switching between rapid and normal water replenishment during operation. It provides a more stable operating state and ensures production safety.

[0031] Furthermore, the method also includes:

[0032] If it is determined that the water replenishment state of the rinsing device is rapid water replenishment, then the first rinsing water flow rate is used as the rinsing water replenishment flow rate to replenish the rinsing device; the first rinsing water flow rate is greater than the normal state water replenishment flow rate; the normal state water replenishment flow rate is the rinsing water replenishment flow rate when the water replenishment state of the rinsing device is normal water replenishment.

[0033] In some embodiments, when the liquid level in the rinsing device is too low, in order to protect the rinsing device and ensure the rinsing effect, it is necessary to quickly raise the liquid level to the normal range. At this time, it is necessary to quickly replenish water to the rinsing device, using a first rinsing water flow rate as the rinsing water replenishment flow rate to replenish the rinsing device. For example, in some specific production lines, the rinsing device consists of 5 rinsing tanks arranged sequentially. Rinsing water flows in from the 5th rinsing tank and flows out from the 1st rinsing tank. The liquid level and conductivity of the 1st rinsing tank can be detected. When the liquid level in the 1st rinsing tank is less than 350 mm, water is replenished to the 5th rinsing tank using a first rinsing water flow rate, preferably 24 cubic meters per hour.

[0034] The embodiments of the present invention have the following technical effects: when the liquid level in the rinsing device is abnormally low, it can effectively protect the rinsing device and ensure the rinsing effect.

[0035] Further, based on the liquid level and conductivity of the washing tower, and the conductivity of the rinsing device, the rinsing water makeup flow rate of the rinsing device is determined, including:

[0036] Determine whether the liquid level of the washing tower is within the preset normal liquid level range of the washing tower, and the relationship between the conductivity of the washing tower and the preset first conductivity of the washing tower;

[0037] If the liquid level of the washing tower is outside the preset normal liquid level range of the washing tower, or if the liquid level of the washing tower is within the preset normal liquid level range of the washing tower and the conductivity of the washing tower is less than or equal to the preset first conductivity of the washing tower, then the rinsing water replenishment flow rate of the rinsing device is adjusted in the same direction according to the increase or decrease of the conductivity of the rinsing device.

[0038] In some embodiments, the scrubbing tower removes harmful substances from acid mist through spray washing and hydrolysis reaction to ensure that emission indicators meet standards. Excessive water flow in the scrubbing tower leads to energy waste, while insufficient water flow results in non-compliance with emission standards. According to field tests, a rinsing water flow rate of ≥8 cubic meters per hour is sufficient to meet the requirements for the Liuzhou Steel 1550 pickling line. Therefore, the normal makeup water flow rate is 8 cubic meters per hour. The effectiveness of the scrubbing tower is mainly judged by its conductivity; therefore, the flow rate is adjusted based on the conductivity. When the liquid level in the scrubbing tower is outside the preset normal liquid level range, the situation of the scrubbing tower is disregarded, and the rinsing water makeup water flow rate is adjusted only based on the conductivity of the rinsing device. When the liquid level in the scrubbing tower is within the preset normal liquid level range, the conductivity of the scrubbing tower is judged. If the conductivity of the scrubbing tower is less than or equal to the preset first scrubbing tower conductivity, it is considered that the current acid mist concentration is still within the range that the scrubbing tower can handle normally, and the rinsing water makeup water flow rate can be controlled only based on the conductivity of the rinsing device itself.

[0039] The embodiments of the present invention have the following technical effects: taking into account the conductivity of the rinsing device and the washing tower, it ensures that the rinsing water in the rinsing device can still effectively clean the panel surface, while ensuring that the acid mist level entering the washing tower is still within the range that the washing tower can handle, thereby ensuring that the panel surface cleaning quality meets environmental protection requirements at the same time.

[0040] Furthermore, determining the rinsing water makeup flow rate of the rinsing device based on the liquid level and conductivity of the washing tower and the conductivity of the rinsing device also includes:

[0041] Determine whether the liquid level of the washing tower is within the preset normal liquid level range of the washing tower, and the relationship between the conductivity of the washing tower and the preset first conductivity of the washing tower;

[0042] If the liquid level of the washing tower is within the preset normal liquid level range of the washing tower and the conductivity of the washing tower is greater than the preset first conductivity of the washing tower, then the rinsing water replenishment flow rate of the rinsing device is adjusted in the same direction according to the increase or decrease of the conductivity of the washing tower.

[0043] In some embodiments, when the liquid level of the scrubbing tower is within the preset normal liquid level range of the scrubbing tower, the conductivity of the scrubbing tower is determined. If the conductivity of the scrubbing tower is greater than the preset first conductivity of the scrubbing tower, it is considered that the concentration of acid mist entering the scrubbing tower is too high, and it is necessary to reduce the concentration of acid mist entering the scrubbing tower by increasing the flow rate of the rinsing water in the rinsing device. At this time, the flow rate of the rinsing water in the rinsing device is adjusted in the same direction according to the increase or decrease of the conductivity of the scrubbing tower.

[0044] The embodiments of the present invention have the following technical effects: taking into account the conductivity of the rinsing device and the washing tower, it ensures that the rinsing water in the rinsing device can still effectively clean the panel surface, while ensuring that the acid mist level entering the washing tower is still within the range that the washing tower can handle, thereby ensuring that the panel surface cleaning quality meets environmental protection requirements at the same time.

[0045] Furthermore, the method also includes:

[0046] If the liquid level in the scrubbing tower is greater than or equal to the preset first scrubbing tower liquid level, then the scrubbing tower will start draining water, or...

[0047] If the liquid level of the scrubbing tower is lower than the preset first scrubbing tower liquid level but higher than the preset second scrubbing tower liquid level, and the conductivity of the scrubbing tower is higher than the preset third scrubbing tower conductivity, then the scrubbing tower will start draining.

[0048] If the liquid level in the scrubbing tower is lower than a preset first scrubbing tower level but higher than a preset second scrubbing tower level, and the conductivity of the scrubbing tower is lower than a preset first scrubbing tower conductivity, then the scrubbing tower stops draining, or...

[0049] If the liquid level in the washing tower is less than or equal to the preset second washing tower liquid level, the washing tower stops draining.

[0050] If the liquid level of the scrubbing tower is less than or equal to the preset third scrubbing tower liquid level, water is supplied to the scrubbing tower at the first scrubbing tower water supply flow rate until the liquid level of the scrubbing tower is greater than the preset second scrubbing tower liquid level, at which point the water supply to the scrubbing tower stops.

[0051] Wherein, the liquid level of the washing tower is defined as being less than the preset first washing tower liquid level and greater than the preset second washing tower liquid level as the preset normal liquid level range of the washing tower;

[0052] Wherein, the conductivity of the preset third washing tower is greater than that of the preset first washing tower; the liquid level of the preset first washing tower is greater than that of the preset second washing tower; and the liquid level of the preset second washing tower is greater than that of the preset third washing tower.

[0053] In some embodiments, it is necessary to ensure the production safety of the scrubbing tower. For example, if the liquid level in the scrubbing tower is too high, it is necessary to drain the water in time to avoid abnormal overflow of the scrubbing tower. During the drainage, the drainage should be stopped when the liquid level drops to a safe range. Or, if the liquid level in the scrubbing tower is too low, for example, below the preset third scrubbing tower liquid level, the drainage will be stopped if the liquid level is lower than the preset second scrubbing tower liquid level. Under normal drainage conditions, the liquid level will usually not be lower than the preset third scrubbing tower liquid level. Once this happens, it indicates that there is an abnormality in the scrubbing tower, and water needs to be replenished into the scrubbing tower quickly. At the same time, a safety inspection of the scrubbing tower should be carried out.

[0054] The embodiments of the present invention have the following technical effects: automatically adjusting the liquid level of the washing tower to ensure that the liquid level in the washing tower is within the normal working range, promptly detecting abnormally low liquid levels in the washing tower and quickly replenishing water to remedy the situation, prompting for safety inspection, and ensuring the safe operation of the washing tower.

[0055] Further, adjusting the rinsing water replenishment flow rate of the rinsing device in the same direction according to the increase or decrease of the conductivity of the rinsing device includes:

[0056] Among the preset multiple rinsing conductivity segments, the rinsing conductivity segment in which the conductivity of the rinsing device is located is determined, and the rinsing water replenishment flow rate corresponding to the rinsing conductivity segment in which the conductivity of the rinsing device is located is taken as the rinsing water replenishment flow rate of the rinsing device.

[0057] Specifically, the conductivity range of the rinsing device is pre-divided into multiple rinsing conductivity segments, which are continuous and do not overlap; a corresponding rinsing water replenishment flow rate is pre-set for each rinsing conductivity segment, and the rinsing water replenishment flow rate corresponding to the rinsing conductivity segment with a larger conductivity value is greater than or equal to the rinsing conductivity segment with a smaller conductivity value.

[0058] In some embodiments, by segmenting the conductivity range and defining a corresponding rinsing water flow rate for each segment, the rinsing water flow rate of the rinsing device can be adjusted in the same direction according to the increase or decrease of the conductivity of the rinsing device. The logic is simple and clear, making it convenient for controllers to adjust the corresponding parameters according to specific circumstances. Furthermore, the simple logic makes it easier for controllers to discover deviations between the actual operation process and the desired control logic, thereby promptly identifying problems and making quick adjustments.

[0059] Furthermore, the step of adjusting the rinsing water replenishment flow rate of the rinsing device in the same direction according to the increase or decrease of the conductivity of the rinsing device also includes:

[0060] If the rinsing conductivity segment containing the conductivity of the rinsing device is the segment with the highest conductivity value among the multiple rinsing conductivity segments, an alarm for abnormal liquid level in the rinsing device will be issued.

[0061] In some embodiments, when the conductivity of the rinsing water in the rinsing device is too high, it can no longer effectively clean the board surface. In this case, abnormal handling is required, such as suspending production or manual intervention. Automatic monitoring of conductivity and alarm can provide more timely alarm feedback and reduce the scrap rate.

[0062] Further, adjusting the rinsing water supply flow rate of the rinsing device in the same direction according to the increase or decrease of the conductivity of the washing tower includes:

[0063] Among the preset multiple conductivity segments of the washing tower, the conductivity segment of the washing tower is determined, and the rinsing water replenishment flow rate corresponding to the conductivity segment of the washing tower is used as the rinsing water replenishment flow rate of the rinsing device.

[0064] Specifically, the conductivity range of the washing tower that is greater than a preset first washing tower conductivity is pre-divided into multiple washing tower conductivity segments, and the multiple washing tower conductivity segments are continuous and do not overlap; a corresponding rinsing water replenishment flow rate is pre-set for each washing tower conductivity segment, and the rinsing water replenishment flow rate corresponding to the washing tower conductivity segment with a larger conductivity value is greater than or equal to the rinsing water replenishment flow rate corresponding to the washing tower conductivity segment with a smaller conductivity value.

[0065] In some embodiments, by segmenting the conductivity range of the washing tower and defining a corresponding rinsing water replenishment flow rate for each segment, the rinsing water replenishment flow rate of the rinsing device can be adjusted in the same direction according to the increase or decrease of the conductivity of the washing tower. The logic is simple and clear, making it convenient for controllers to adjust the corresponding parameters according to specific circumstances. Furthermore, the simple logic makes it easier for controllers to discover deviations between the actual operation process and the desired control logic, thereby promptly identifying problems and making quick adjustments.

[0066] Further, the step of using the rinse water replenishment flow rate corresponding to the rinse conductivity segment of the rinsing device as the rinse water replenishment flow rate of the rinsing device includes:

[0067] If it is determined that the conductivity of the rinsing device is less than or equal to the preset first rinsing conductivity, then the rinsing water replenishment flow rate of the rinsing device is set to the second rinsing water flow rate.

[0068] If it is determined that the conductivity of the rinsing device is greater than the preset first rinsing conductivity and less than or equal to the preset second rinsing conductivity, then the rinsing water replenishment flow rate of the rinsing device is set to the third rinsing water flow rate.

[0069] If it is determined that the conductivity of the rinsing device is greater than the preset second rinsing conductivity and less than or equal to the preset third rinsing conductivity, then the rinsing water replenishment flow rate of the rinsing device is set to the fourth rinsing water flow rate.

[0070] If it is determined that the conductivity of the rinsing device is greater than the preset third rinsing conductivity, an alarm for abnormal liquid level in the rinsing device is issued.

[0071] Wherein, the third rinsing water flow rate is greater than the second rinsing water flow rate; the fourth rinsing water flow rate is greater than the third rinsing water flow rate; the first rinsing water flow rate is greater than the third rinsing water flow rate; and the first rinsing water flow rate is the rinsing water replenishment flow rate when the rinsing device is in the rapid replenishment state.

[0072] In some embodiments, by segmenting the conductivity range and defining a corresponding rinsing water flow rate for each segment, the rinsing water flow rate of the rinsing device can be adjusted in the same direction according to the increase or decrease of the conductivity of the rinsing device. The logic is simple and clear, making it convenient for controllers to adjust the corresponding parameters according to specific circumstances. Furthermore, the simple logic makes it easier for controllers to discover deviations between the actual operation process and the desired control logic, thereby promptly identifying problems and making quick adjustments.

[0073] Furthermore, the rinsing water makeup flow rate corresponding to the conductivity segment of the washing tower is used as the rinsing water makeup flow rate of the rinsing device, including:

[0074] If it is determined that the conductivity of the washing tower is greater than the preset first washing tower conductivity and less than or equal to the preset second washing tower conductivity, then the rinsing water replenishment flow rate of the rinsing device is set to the fifth rinsing water replenishment flow rate.

[0075] If it is determined that the conductivity of the washing tower is greater than the preset second washing tower conductivity and less than or equal to the preset third washing tower conductivity, then the rinsing water replenishment flow rate of the rinsing device is set to the sixth rinsing water replenishment flow rate.

[0076] Wherein, the preset first washing tower conductivity is less than the preset second washing tower conductivity; the preset second washing tower conductivity is less than the preset third washing tower conductivity; the sixth rinsing water flow rate is greater than the fifth rinsing water flow rate; the first rinsing water flow rate is greater than the sixth rinsing water flow rate, and the first rinsing water flow rate is the rinsing water replenishment flow rate when the rinsing device is in the rapid water replenishment state.

[0077] In some embodiments, by segmenting the conductivity range of the washing tower and defining a corresponding rinsing water replenishment flow rate for each segment, the rinsing water replenishment flow rate of the rinsing device can be adjusted in the same direction according to the increase or decrease of the conductivity of the washing tower. The logic is simple and clear, making it convenient for controllers to adjust the corresponding parameters according to specific circumstances. Furthermore, the simple logic makes it easier for controllers to discover deviations between the actual operation process and the desired control logic, thereby promptly identifying problems and making quick adjustments.

[0078] The technical solutions of the present invention will be described in detail below with reference to specific application examples. For technical details not described in the implementation process, please refer to the relevant descriptions above.

[0079] Addressing the issue that existing technologies for industrial water use in the pickling and rinsing process rely on manual operation based on the rinsing tank level when abnormal indicators occur, the inventors proposed an automatic control mode for indicators such as flow rate, level, and conductivity to improve industrial water utilization and production stability. By remodeling the rinsing water control system of the 1550 pickling line, writing control programs, and optimizing the process media control of the rinsing section in the 1550 cold rolling pickling-continuous rolling mill, the inventors tested the improved system in the rinsing water process media control. The improved system meets stable production requirements, operates stably and efficiently, satisfies the requirements for fully automatic rinsing water control, and provides good surface cleaning. After use, the conductivity remains stable, and indicator adjustments are timely. No problems such as excessive emissions or exceeding standards have occurred, creating significant environmental value, meeting energy conservation and emission reduction requirements, and generating certain economic benefits. Furthermore, the modification only requires the addition of a flow control valve, resulting in low modification costs, minimal time commitment, and quick results. The 1550 pickling line can produce steel plates with a maximum width of 1550 mm and a thickness of 2.5 to 5 mm. The main materials are general grade steel (CQ), stamping steel (DQ), and deep drawing steel (DDQ). Table 1 gives the target value range of composition for general grade steel (CQ), stamping steel (DQ), and deep drawing steel (DDQ).

[0080]

[0081] Table 1. Target Composition Value Ranges for General-Purpose Steel (CQ), Stamping Steel (DQ), and Deep-Drawing Steel (DDQ)

[0082] The following is based on Figure 3 The rinsing water circulation diagram shown illustrates an embodiment of the present invention.

[0083] The rinsing water is the water in the rinsing system. Condensate becomes rinsing water after passing through the rinsing system. Demineralized water is supplied from auxiliary facilities, and condensate is heated demineralized water. The rinsing system includes five rinsing tanks, numbered 1 to 5, connected sequentially so that rinsing water can flow from rinsing tank 5 to rinsing tank 1. The rinsing water in the rinsing system comes from the condensate in condensate tank 6. The demineralized water in demineralized water tank 10 is mainly used for emergency spraying; when the production line stops abnormally, demineralized water tank 10 is activated to spray for one minute. The condensate from condensate tank 6 becomes rinsing water after entering the rinsing system. A flow control valve 7 can be installed on the condensate pipe between condensate tank 6 and the rinsing system to automatically control the flow rate of rinsing water injected into the rinsing system. The rinsing water in the rinsing system flows sequentially from rinsing tank 5 through each rinsing tank, finally reaching rinsing tank 1 before exiting the rinsing system and entering the washing tower 8. The rinsing water flowing out of the washing tower 8 flows into the rinsing water tank 9, and after flowing out of the rinsing water tank 9, it is sent to acidic water for acid regeneration treatment.

[0084] Condensate tank control: Add demineralized water when the liquid level is below 0.8m, and stop adding water when it is above 1.8m.

[0085] like Figure 2 As shown, the rinsing water control conditions are as follows:

[0086] Condition 1: The conductivity of tank #1 (rinsing tank 1) is ≤6000μS / cm (microSiemens per centimeter), and the condensate water (i.e., the condensate water entering the rinsing device, which is also the rinsing water) makeup water flow rate is 8m³ / cm. 3 / h (cubic meters per hour); 6000μS / cm < 1# tank conductivity ≤ 10000μS / cm, condensate water (i.e., the condensate water entering the rinsing device, which is also the rinsing water) makeup water flow rate 10m 3 / h (cubic meters / hour); the conductivity of tank #1 is >10000μS / cm, and the condensate water (i.e., the condensate water entering the rinsing device, which is also the rinsing water) makeup water flow rate is 12m³ / h. 3 / h. When the conductivity of tank #1 is >12000μS / cm, an alarm will be triggered, and the operator will handle the situation according to the actual circumstances.

[0087] Condition 2: The liquid level in tank #1 is ≥350mm. The flow rate is controlled according to condition 1. When the liquid level in tank #1 is <350mm, start rapid water replenishment and stop when the water level reaches 380mm.

[0088] Scrubber control conditions: When the scrubber liquid level is above 950mm, drainage is initiated; when it is below 600mm, drainage stops; when it is below 450mm, demineralized water replenishment is initiated, and demineralized water is replenished through the scrubber's dedicated demineralized water replenishment pipeline until the level reaches 600mm.

[0089] Condition 3: When the washing tower liquid level is between 600 and 950 mm and the conductivity is ≥90 mS / cm, drainage starts; when the conductivity is <70 mS / cm, drainage stops. If the washing tower conductivity is between 70 mS / cm and 80 mS / cm, the makeup water flow rate into the rinsing device is controlled at 10 m³ / h; if the washing tower conductivity is between 80 mS / cm and 90 mS / cm, the makeup water flow rate into the rinsing device is controlled at 12 m³ / h.

[0090] Rinse water tank control conditions: Drainage starts when the liquid level is ≥1.8 meters; drainage stops when the liquid level is below 0.8 meters.

[0091] Because under existing technology, rinsing water is replenished only according to the liquid level and the flow rate is constant, the improved embodiment of the present invention requires simultaneous control of liquid level, conductivity and flow rate. However, it is only necessary to add a flow regulating valve to the condensate replenishment to the rinsing water pipeline, and then control it according to the method disclosed in the embodiment of the present invention. The improvement of the original equipment system is simple and easy to implement.

[0092] When the condensate flow rate 1 is assigned a value based on the conductivity of tank #1 (rinsing tank 1), specifically, if the conductivity of tank #1 is ≤6000μm / cm, the assigned value is 8m. 3 / h; 6000μS / cm < 1# tank conductivity ≤ 10000μS / cm, assigned a value of 10m 3 / h; 1# tank conductivity >10000μS / cm, assigned a value of 12m 3 / h;

[0093] When the condensate flow rate 2 is assigned based on the washing tower liquid level, specifically, if the washing tower conductivity is 70ms / cm < 80ms / cm, the makeup water flow rate of the rinsing water flowing into the rinsing device is assigned to 10 cubic meters / hour; if the washing tower conductivity is 80ms / cm < 90ms / cm, the makeup water flow rate of the rinsing water flowing into the rinsing device is assigned to 12 cubic meters / hour.

[0094] That is, Q1 = 1# tank is assigned a value, and Q2 = washing tower is assigned a value. Under the premise of prioritizing the liquid level condition, the maximum value of Q1 and Q2 is taken.

[0095] The embodiments of this invention have the following technical advantages: Through testing in the rinsing water process medium control, stable production can be achieved with good surface cleaning results. Furthermore, the modification of the existing system only requires the addition of a flow control valve, resulting in low modification costs, minimal time commitment, and quick results.

[0096] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process may be rearranged without departing from the scope of this disclosure. The appended method claims provide elements of various steps in an exemplary order and are not intended to limit the scope to the specific order or hierarchy described.

[0097] In the above detailed description, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the invention is presented with fewer features than all of the features in a single disclosed embodiment. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, with each claim representing a separate preferred embodiment of the invention. The disclosed embodiments have been described above to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit and scope of this disclosure. Therefore, this disclosure is not limited to the embodiments given herein, but is consistent with the broadest scope of the principles and novel features disclosed in this application.

[0098] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations falling within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is used in a manner similar to the term "including." Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

[0099] Those skilled in the art will also understand that the various illustrative logical blocks, units, and steps listed in the embodiments of the present invention can be implemented by electronic hardware, computer software, or a combination of both. To clearly demonstrate the interchangeability of hardware and software, the functions of the various illustrative components, units, and steps described above have been generally described. Whether such functionality is implemented through hardware or software depends on the specific application and the overall system design requirements. Those skilled in the art can implement the described functions using various methods for each specific application, but such implementation should not be construed as exceeding the scope of protection of the embodiments of the present invention.

[0100] The various illustrative logic blocks or units described in the embodiments of this invention can be implemented or operate the described functions using a general-purpose processor, digital signal processor, application-specific integrated circuit (ASIC), field-programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. The general-purpose processor can be a microprocessor; alternatively, it can be any conventional processor, controller, microcontroller, or state machine. The processor can also be implemented using a combination of computing devices, such as a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors combined with a digital signal processor core, or any other similar configuration.

[0101] The steps of the methods or algorithms described in the embodiments of this invention can be directly embedded in hardware, a software module executed by a processor, or a combination of both. The software module can be stored in RAM, flash memory, ROM, EPROM, EEPROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium in the art. Exemplarily, the storage medium can be connected to the processor so that the processor can read information from and write information to the storage medium. Optionally, the storage medium can also be integrated into the processor. The processor and storage medium can be housed in an ASIC, which can be housed in a user terminal. Optionally, the processor and storage medium can also be housed in different components of the user terminal.

[0102] In one or more exemplary designs, the functions described in the embodiments of the present invention can be implemented in hardware, software, firmware, or any combination of these three. If implemented in software, these functions can be stored on a computer-readable medium or transmitted on a computer-readable medium in the form of one or more instructions or code. Computer-readable media include computer storage media and communication media that facilitate the transfer of computer programs from one place to another. Storage media can be any available media that can be accessed by a general-purpose or special-purpose computer. For example, such computer-readable media can include, but is not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store program code in the form of instructions or data structures and other forms that can be read by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Furthermore, any connection can be suitably defined as a computer-readable medium, for example, if the software is transmitted from a website, server or other remote resource via a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wirelessly, such as infrared, wireless and microwave, it is also included in the defined computer-readable medium. The disks and discs mentioned include compressed disks, laser discs, optical discs, DVDs, floppy disks, and Blu-ray discs. Disks typically copy data magnetically, while disks typically copy data optically using lasers. Combinations of the above can also be contained in computer-readable media.

[0103] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for controlling rinsing water in a pickling line, characterized in that, include: Real-time acquisition of liquid level and conductivity of the rinsing device, as well as liquid level and conductivity of the washing tower; Based on the liquid level change of the rinsing device, determine the water replenishment status of the rinsing device, and determine whether the water replenishment status of the rinsing device is normal water replenishment; If it is determined that the water replenishment status of the rinsing device is normal, then the water replenishment flow rate of the rinsing device is determined based on the liquid level and conductivity of the washing tower and the conductivity of the rinsing device. The water replenishment status of the rinsing device is determined according to the liquid level of the rinsing device, and the water replenishment status of the rinsing device includes normal water replenishment and rapid water replenishment. Determining the water replenishment status of the rinsing device based on the liquid level change of the rinsing device includes: Real-time monitoring of the relationship between the liquid level of the rinsing device and the preset first rinsing liquid level and the preset second rinsing liquid level; If the liquid level of the rinsing device is lower than the preset first rinsing liquid level, the water replenishment state of the rinsing device is set to rapid water replenishment and maintained in rapid water replenishment state until the liquid level of the rinsing device is greater than or equal to the preset second rinsing liquid level. Then, the water replenishment state of the rinsing device is set to normal water replenishment and maintained in normal water replenishment state until the liquid level of the rinsing device is lower than the preset first rinsing liquid level. This cycle is repeated. Wherein, the preset second rinsing liquid level is greater than the preset first rinsing liquid level; Based on the liquid level and conductivity of the washing tower, and the conductivity of the rinsing device, the rinsing water makeup flow rate of the rinsing device is determined, including: Determine whether the liquid level of the washing tower is within the preset normal liquid level range of the washing tower, and the relationship between the conductivity of the washing tower and the preset first conductivity of the washing tower; If the liquid level of the washing tower is outside the preset normal liquid level range of the washing tower, or if the liquid level of the washing tower is within the preset normal liquid level range of the washing tower and the conductivity of the washing tower is less than or equal to the preset first conductivity of the washing tower, then the rinsing water replenishment flow rate of the rinsing device is adjusted in the same direction according to the increase or decrease of the conductivity of the rinsing device.

2. The method for controlling rinsing water in a pickling line as described in claim 1, characterized in that, The method further includes: If it is determined that the water replenishment state of the rinsing device is rapid water replenishment, then the first rinsing water flow rate is used as the rinsing water replenishment flow rate to replenish the rinsing device; the first rinsing water flow rate is greater than the normal state water replenishment flow rate; the normal state water replenishment flow rate is the rinsing water replenishment flow rate when the water replenishment state of the rinsing device is normal water replenishment.

3. The method for controlling rinsing water in a pickling line as described in claim 1, characterized in that, The determination of the rinsing water makeup flow rate of the rinsing device, based on the liquid level and conductivity of the washing tower and the conductivity of the rinsing device, further includes: Determine whether the liquid level of the washing tower is within the preset normal liquid level range of the washing tower, and the relationship between the conductivity of the washing tower and the preset first conductivity of the washing tower; If the liquid level of the washing tower is within the preset normal liquid level range of the washing tower and the conductivity of the washing tower is greater than the preset first conductivity of the washing tower, then the rinsing water replenishment flow rate of the rinsing device is adjusted in the same direction according to the increase or decrease of the conductivity of the washing tower.

4. The method for controlling rinsing water in a pickling line as described in claim 1, characterized in that, The method further includes: If the liquid level in the scrubbing tower is greater than or equal to the preset first scrubbing tower liquid level, then the scrubbing tower will start draining water, or... If the liquid level of the scrubbing tower is lower than the preset first scrubbing tower liquid level but higher than the preset second scrubbing tower liquid level, and the conductivity of the scrubbing tower is higher than the preset third scrubbing tower conductivity, then the scrubbing tower will start draining. If the liquid level in the scrubbing tower is lower than a preset first scrubbing tower level but higher than a preset second scrubbing tower level, and the conductivity of the scrubbing tower is lower than a preset first scrubbing tower conductivity, then the scrubbing tower stops draining, or... If the liquid level in the washing tower is less than or equal to the preset second washing tower liquid level, the washing tower stops draining. If the liquid level of the scrubbing tower is less than or equal to the preset third scrubbing tower liquid level, water is supplied to the scrubbing tower at the first scrubbing tower water supply flow rate until the liquid level of the scrubbing tower is greater than the preset second scrubbing tower liquid level, at which point the water supply to the scrubbing tower stops. Wherein, the liquid level of the washing tower is defined as being less than the preset first washing tower liquid level and greater than the preset second washing tower liquid level as the preset normal liquid level range of the washing tower; Wherein, the conductivity of the preset third washing tower is greater than that of the preset first washing tower; the liquid level of the preset first washing tower is greater than that of the preset second washing tower; and the liquid level of the preset second washing tower is greater than that of the preset third washing tower.

5. The method for controlling rinsing water in a pickling line as described in claim 1, characterized in that, Adjusting the rinse water flow rate of the rinsing device in the same direction according to the increase or decrease of the conductivity of the rinsing device includes: Among the preset multiple rinsing conductivity segments, the rinsing conductivity segment in which the conductivity of the rinsing device is located is determined, and the rinsing water replenishment flow rate corresponding to the rinsing conductivity segment in which the conductivity of the rinsing device is located is taken as the rinsing water replenishment flow rate of the rinsing device. Specifically, the conductivity range of the rinsing device is pre-divided into multiple rinsing conductivity segments, which are continuous and do not overlap; a corresponding rinsing water replenishment flow rate is pre-set for each rinsing conductivity segment, and the rinsing water replenishment flow rate corresponding to the rinsing conductivity segment with a larger conductivity value is greater than or equal to the rinsing conductivity segment with a smaller conductivity value.

6. The method for controlling rinsing water in a pickling line as described in claim 5, characterized in that, The step of adjusting the rinsing water replenishment flow rate of the rinsing device in the same direction according to the increase or decrease of the conductivity of the rinsing device further includes: If the rinsing conductivity segment containing the conductivity of the rinsing device is the segment with the highest conductivity value among the multiple rinsing conductivity segments, an alarm for abnormal liquid level in the rinsing device will be issued.

7. The method for controlling rinsing water in a pickling line as described in claim 3, characterized in that, The step of adjusting the rinsing water supply flow rate of the rinsing device in the same direction according to the increase or decrease of the conductivity of the washing tower includes: Among the preset multiple conductivity segments of the washing tower, the conductivity segment of the washing tower is determined, and the rinsing water replenishment flow rate corresponding to the conductivity segment of the washing tower is used as the rinsing water replenishment flow rate of the rinsing device. Specifically, the conductivity range of the washing tower that is greater than a preset first washing tower conductivity is pre-divided into multiple washing tower conductivity segments, and the multiple washing tower conductivity segments are continuous and do not overlap; a corresponding rinsing water replenishment flow rate is pre-set for each washing tower conductivity segment, and the rinsing water replenishment flow rate corresponding to the washing tower conductivity segment with a larger conductivity value is greater than or equal to the rinsing water replenishment flow rate corresponding to the washing tower conductivity segment with a smaller conductivity value.

8. The method for controlling rinsing water in a pickling line as described in claim 5, characterized in that, The step of dividing the rinsing conductivity of the rinsing device into segments corresponding to the rinsing conductivity into the rinsing water replenishment flow rate, and using this as the rinsing water replenishment flow rate of the rinsing device, includes: If it is determined that the conductivity of the rinsing device is less than or equal to the preset first rinsing conductivity, then the rinsing water replenishment flow rate of the rinsing device is set to the second rinsing water flow rate. If it is determined that the conductivity of the rinsing device is greater than the preset first rinsing conductivity and less than or equal to the preset second rinsing conductivity, then the rinsing water replenishment flow rate of the rinsing device is set to the third rinsing water flow rate. If it is determined that the conductivity of the rinsing device is greater than the preset second rinsing conductivity and less than or equal to the preset third rinsing conductivity, then the rinsing water replenishment flow rate of the rinsing device is set to the fourth rinsing water flow rate. If it is determined that the conductivity of the rinsing device is greater than the preset third rinsing conductivity, an alarm for abnormal liquid level in the rinsing device is issued. Wherein, the third rinsing water flow rate is greater than the second rinsing water flow rate; the fourth rinsing water flow rate is greater than the third rinsing water flow rate; the first rinsing water flow rate is greater than the third rinsing water flow rate; and the first rinsing water flow rate is the rinsing water replenishment flow rate when the rinsing device is in the rapid replenishment state.

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