A strip steel annealing unit water saving control system

Abstract

This invention discloses a water-saving control system for a strip annealing unit, comprising an industrial water inlet pipe, a spray return water tank, a hot water tank, a hot water circulation tank, and an alkali circulation tank. The industrial water inlet pipe is connected to the inlet of a spray cooler. The spray return water tank is connected to the spray cooler via the spray inlet pipe and the spray return water pipe, respectively. The hot water tank is connected to the water spray area of ​​the washing tank via the hot water inlet pipe and the hot water return water pipe, respectively. The hot water tank is connected to the spray inlet pipe via a first transition pipe. The hot water circulation tank is connected to the water brush area of ​​the washing tank via the hot water circulation inlet pipe and the hot water circulation return water pipe, respectively. The alkali circulation tank is connected to the alkali washing tank via the alkali circulation inlet pipe and the alkali circulation return water pipe, respectively. The alkali circulation tank is connected to the hot water circulation inlet pipe via a second transition pipe. The alkali circulation tank is connected to the original alkali inlet pipe used for conveying the original alkali solution. A washing tank baffle is installed vertically on the bottom side of the inner wall of the washing tank, and the washing tank baffle is lower than the position where the strip passes through the washing tank.

Description

Technical Field

[0001] This invention relates to the field of steel rolling technology, and in particular to a water-saving control system for strip annealing units. Background Technology

[0002] Existing continuous annealing units for cold-rolled strip steel generally consist of several parts, including a cleaning section, an annealing furnace, and a cooling section. The cleaning section includes an alkaline washing section and a water washing section. In particular, the alkaline preparation process in the alkaline washing section, the water washing process in the water washing section, and the cooling process after the annealing furnace all require a large amount of industrial water.

[0003] Currently, annealing units have numerous water-using points with varying water environments and requirements, resulting in large wastewater volumes and a lack of water conservation awareness. For example, the water spray cooler directly sprays industrial water onto the strip steel for cooling, and the heated industrial water remains uncontaminated. Alkali washing and water washing also require large amounts of industrial water for strip steel cleaning. Furthermore, to ensure water quality, the cleaning water needs to be regularly discharged and replaced. All of these factors contribute to a significant waste of industrial water.

[0004] How to coordinate several water use points and use industrial water in stages has become a new challenge under the current dual-carbon situation. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a water-saving control system for strip annealing units.

[0006] This application provides a water-saving control system for a strip steel annealing unit. The strip steel passes sequentially through an alkaline washing tank, a water washing tank, an annealing furnace, and a spray cooler in the annealing unit. The water washing tank includes a water brush area and a water spray area arranged sequentially along the strip steel's running direction. The water-saving control system includes an industrial water inlet pipe, a spray return water tank, a hot water tank, a hot water circulation tank, and an alkaline solution circulation tank. One end of the industrial water inlet pipe is connected to an industrial water source, and the other end is connected to the inlet of the spray cooler. A spray industrial water valve is installed on the industrial water inlet pipe. The spray return water tank is connected to the spray cooler via the spray inlet pipe and the spray return water pipe, respectively. A spray pump and a spray connecting valve are installed on the spray inlet pipe, with the spray pump closer to the spray return water tank than the spray connecting valve. The hot water tank is connected to the water spray area of ​​the water washing tank via a hot water inlet pipe and a hot water return water pipe, respectively. The hot water tank is connected to the spray pump and the spray connecting valve via a first transition pipe. Between the valves, a hot water pump is installed on the hot water inlet pipe, a hot water return valve is installed on the hot water return pipe, and a spray hot water valve is installed on the first transition pipe; the hot water circulation tank is connected to the water brush area of ​​the washing tank through the hot water circulation inlet pipe and the hot water circulation return pipe respectively, and a hot water circulation pump is installed on the hot water circulation inlet pipe; the alkali circulation tank is connected to the alkali washing tank through the alkali circulation inlet pipe and the alkali circulation return pipe respectively, and the alkali circulation tank is connected to the hot water circulation inlet pipe through the second transition pipe between the hot water circulation pump and the washing tank; the alkali circulation tank is connected to the original alkali inlet pipe used to transport the original alkali, and an alkali circulation pump is installed on the alkali circulation inlet pipe; a water replenishment valve is installed on the second transition pipe, and an alkali supply valve is installed on the original alkali inlet pipe; wherein, the washing tank has a washing tank baffle installed vertically on the bottom side of the inner wall, the washing tank baffle is lower than the position where the strip steel passes through the washing tank, and both the hot water tank and the alkali circulation tank are connected to a waste discharge pipe with a waste discharge valve.

[0007] In some implementations, a makeup water flow meter is installed in the second transition pipe, and an alkali flow meter is installed in the original alkali inlet pipe.

[0008] In some implementations, when it is necessary to replenish the alkali solution in the alkali solution circulation tank, the original alkali solution and water are added to the alkali solution circulation tank by opening the alkali supply valve and the water replenishment valve. The required water replenishment amount is calculated as follows: (original alkali solution concentration - target alkali solution concentration) * original alkali solution cumulative flow rate / target alkali solution concentration.

[0009] In some embodiments, the water-saving control system includes a first plate thermometer, a second plate thermometer, and a water temperature monitor; the first plate thermometer and the second plate thermometer are respectively installed on the front and rear sides of the spray cooler, and during operation, the strip steel passes through the annealing furnace, the first plate thermometer, the spray cooler, and the second plate thermometer in sequence; the spray return water pipe includes a water storage section at the end, which is directly connected to the spray return water tank so that the water storage section can be filled with water even when the spray cooler is not running, and the water temperature monitor is installed in the water storage section.

[0010] In some implementations, the water storage section is arranged horizontally.

[0011] In some implementations, the hot water return valve is periodically closed based on the hot water consumption of the hot water circulation tank, so that the liquid level in the water spray area rises periodically, and the hot water circulation tank is replenished with excess hot water through the hot water circulation return pipe.

[0012] In some implementations, when the water level in the hot water tank is too high, the drain valve on the drain pipe connected to the hot water tank is opened; when the water level in the hot water tank is too low, the spray hot water valve is opened.

[0013] In some implementations, depending on the quality of the alkali cleaning in the alkali circulation tank, waste is periodically discharged through the waste discharge valve on the waste discharge pipe connected to the alkali circulation tank to ensure the cleanliness of the alkali.

[0014] In some implementations, when the temperature measured by the first plate thermometer is lower than the temperature measured by the water temperature monitor, the spray pump, the hot water spray valve, the spray connecting valve, and the industrial water spray valve are all in the closed state.

[0015] In some implementations, when the temperature measured by the first thermometer is higher than the temperature measured by the water temperature monitor, the spray pump and spray connecting valve are opened, and the spray industrial water valve is closed to spray and cool the strip steel; when the temperature measured by the second thermometer is lower than the target temperature, the spray pump and spray connecting valve remain open, and the spray industrial water valve remains closed; when the temperature measured by the second thermometer is higher than the target temperature, the spray industrial water valve is opened, the spray connecting valve is closed, the spray hot water valve is opened, and the spray pump operates until the temperature measured by the second thermometer is lower than the target temperature; when the temperature measured by the second thermometer returns to below the target temperature, the spray pump and spray connecting valve are opened, and the spray hot water valve and spray industrial water valve are closed to spray and cool the strip steel; wherein, the target temperature is the maximum allowable temperature value of the strip steel after being cooled by the spray cooler.

[0016] The beneficial effects of this application are as follows: It provides a water-saving control system for a strip annealing unit, including an industrial water inlet pipe, a spray return water tank, a hot water tank, a hot water circulation tank, and an alkali circulation tank. Specifically, based on the outlet plate temperature of the annealing furnace, the relevant control valves of the spray cooler regulate and control the strip plate temperature at the annealing furnace outlet. Simultaneously, the hot water after heat exchange can be transported to the hot water tank via a spray pump through a first transition pipe for use in strip cleaning within the cleaning section. This solution adds a baffle in the middle of the washing tank to separate the water brushing area and the water spraying area, thus separating the water used after water brushing from the water used after water spraying, separating water of different qualities. By controlling the opening and closing of the hot water return valve in the hot water tank, the water spraying area... The liquid level rises and overflows periodically, with the cleaner water spray area replenishing the water brush area to maintain the liquid level in the hot water circulation tank. Additionally, a second transition pipe allows water from the hot water circulation tank to be used to replenish the alkali circulation tank, enabling the use of the industrial water after water washing for preparing the alkali solution for alkali washing. Overall, this solution involves only one industrial water inlet, providing water replenishment to the spray return water tank, hot water tank, hot water circulation tank, and alkali circulation tank. It also includes a raw alkali inlet pipe for replenishing the original alkali solution and two waste outlets for waste disposal when liquid impurities no longer meet usage requirements. This solution achieves multiple reuses of industrial water, ensuring the quality of strip steel cleaning and cooling effect while conserving water. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention.

[0018] Figure 1 This is a schematic diagram of a water-saving control system for a strip steel annealing unit provided in this application.

[0019] Attached diagram labels: 1-Alkali circulation tank, 1a-Alkali circulation inlet pipe, 1b-Alkali circulation return pipe, 1c-Second transition pipe, 1d-Original alkali inlet pipe, 1e-First waste discharge pipe, 11-Alkali circulation pump, 12-Alkali supply valve, 13-Alkali flow meter, 14-First waste discharge valve, 2-Hot water circulation tank, 2a-Hot water circulation inlet pipe, 2b-Hot water circulation return pipe, 21-Hot water circulation pump, 22-Make-up water valve, 23-Make-up water flow meter, 3-Hot water tank, 3a-Hot water inlet pipe, 3b-Hot water return pipe, 3c-First transition pipe, 3d-Second waste discharge pipe, 31-Hot water pump. 32-Hot water return valve, 33-Washing tank baffle, 34-Second waste discharge valve, 4-Spray return water tank, 4a-Spray inlet pipe, 4b-Spray return water pipe, 4c-Industrial water inlet pipe, 41-Spray pump, 42-Spray hot water valve, 43-Spray connecting valve, 44-Spray industrial water valve, 45-First plate thermometer, 46-Second plate thermometer, 47-Water temperature monitor, 100-Strip steel, 210-Alkali washing tank, 220-Washing tank, 221-Water brush area, 222-Water spray area, 230-First dryer, 240-Annealing furnace, 250-Spray cooler, 260-Second dryer. Detailed Implementation

[0020] Please refer to Figure 1 This application discloses a water-saving control system for a strip annealing unit, which relates to a 100-ton continuous annealing unit for cold-rolled strip steel. Please refer to... Figure 1 The strip steel 100 passes sequentially through the alkali washing tank 210, the water washing tank 220, the annealing furnace 240, and the spray cooler 250 in the annealing unit. Figure 1 The diagram also illustrates the arrangement of the first dryer 230 and the second dryer 260.

[0021] Please refer to Figure 1 The washing tank 220 includes a water brushing zone 221 and a water spraying zone 222. The water brushing zone 221 and the water spraying zone 222 are arranged sequentially along the running direction of the strip steel 100. The strip steel 100 first passes through the water brushing zone 221 and then through the water spraying zone 222. The quality of the industrial water after the strip steel 100 is brushed is worse than that after the strip steel 100 is sprayed. A washing tank baffle 33 is vertically installed on the bottom inner wall of the washing tank 220. The baffle 33 is lower than the point where the strip steel 100 passes through the washing tank 220, thus effectively dividing the washing tank 220 into the water brushing zone 221 and the water spraying zone 222. When the liquid level in the water spraying zone 222 rises, the industrial water overflows the baffle 33 and enters the water brushing zone 221.

[0022] The water-saving control system includes an industrial water inlet pipe 4c, a spray return water tank 4, a hot water tank 3, a hot water circulation tank 2, and an alkaline solution circulation tank 1.

[0023] Please refer to Figure 1One end of the industrial water inlet pipe 4c is connected to an industrial water source, and industrial water enters through the industrial water inlet pipe 4c. The other end of the industrial water inlet pipe 4c is connected to the inlet of the spray cooler 250. The industrial water inlet pipe 4c is equipped with a spray industrial water valve 44. When the spray industrial water valve 44 is in the open state, water enters the spray cooler 250 through the industrial water inlet pipe 4c. When the spray industrial water valve 44 is in the closed state, water intake stops.

[0024] Please refer to Figure 1 The spray return water tank 4 is connected to the spray cooler 250 via a spray inlet pipe 4a and a spray return water pipe 4b, respectively. Specifically, the spray inlet pipe 4a connects to the inlet of the spray cooler 250, and the spray return water pipe 4b connects to the outlet of the spray cooler 250. A spray pump 41 and a spray connecting valve 43 are installed on the spray inlet pipe 4a, with the spray pump 41 closer to the spray return water tank 4 than the spray connecting valve 43 on the spray inlet pipe 4a.

[0025] Please refer to Figure 1 The hot water tank 3 is connected to the water spray area 222 of the washing tank 220 via a hot water inlet pipe 3a and a hot water return pipe 3b. Specifically, the hot water inlet pipe 3a connects to the inlet of the water spray area 222 of the washing tank 220, and the hot water return pipe 3b connects to the outlet of the water spray area 222 of the washing tank 220. The hot water tank 3 is connected to the spray inlet pipe 4a via a first transition pipe 3c. The connection point between the first transition pipe 3c and the spray inlet pipe 4a is located between the spray pump 41 and the spray connecting valve 43. The hot water pump 31 is installed on the hot water inlet pipe 3a, the hot water return valve 32 is installed on the hot water return pipe 3b, and the spray hot water valve 42 is installed on the first transition pipe 3c.

[0026] Please refer to Figure 1 The hot water circulation tank 2 is connected to the water brush area 221 of the washing tank 220 through the hot water circulation inlet pipe 2a and the hot water circulation return pipe 2b respectively. Specifically, the hot water circulation inlet pipe 2a is connected to the inlet of the water brush area 221 of the washing tank 220, and the hot water circulation return pipe 2b is connected to the outlet of the water brush area 221 of the washing tank 220. A hot water circulation pump 21 is installed on the hot water circulation inlet pipe 2a.

[0027] Please refer to Figure 1 The alkali circulation tank 1 is connected to the alkali washing tank 210 via an alkali circulation inlet pipe 1a and an alkali circulation return water pipe 1b. Specifically, the alkali circulation inlet pipe 1a connects to the inlet of the alkali washing tank 210, and the alkali circulation return water pipe 1b connects to the outlet of the alkali washing tank 210. The alkali circulation tank 1 is connected to the hot water circulation inlet pipe 2a via a second transition pipe 1c, which connects the hot water circulation pump 21 and the washing tank 220. The alkali circulation tank 1 is connected to the raw alkali inlet pipe 1d, which is used to transport the raw alkali solution. An alkali circulation pump 11 is installed on the alkali circulation inlet pipe 1a, a water replenishment valve 22 is installed on the second transition pipe 1c, and an alkali supply valve 12 is installed on the raw alkali inlet pipe 1d.

[0028] Both the hot water tank 3 and the alkali circulation tank 1 are connected to a waste discharge pipe equipped with a waste discharge valve. Please refer to... Figure 1 The alkali circulation tank 1 is connected to the first waste discharge pipe 1e, and the first waste discharge valve 14 is installed on the first waste discharge pipe 1e. The hot water tank 3 is connected to the second waste discharge pipe 3d, and the second waste discharge valve 34 is installed on the second waste discharge pipe 3d. When the liquid impurities do not meet the usage conditions, waste is discharged by opening the waste discharge valves. This solution uses two waste discharge valves to discharge waste when the liquid impurities do not meet the usage conditions.

[0029] Based on the outlet plate temperature of the annealing furnace 240, the strip steel 100 temperature at the outlet of the spray cooler 250 is regulated and controlled by the relevant control valves. Simultaneously, the hot water after heat exchange can be transported through the first transition pipe 3c and the spray pump 41 to the hot water tank 3 for use in cleaning the strip steel 100 in the cleaning section area.

[0030] Furthermore, by adding a baffle in the middle of the water washing tank 220, the water brushing area 221 and the water spraying area 222 are separated, and water of different qualities is separated. By controlling the opening and closing of the hot water return valve 32 of the hot water tank 3, the liquid level of the water spraying area 222 is raised and overflowed in a timely manner, and the cleaner water spraying area 222 is used to replenish the water brushing area 221, thus ensuring the liquid level of the hot water circulation tank 2.

[0031] In addition, the water in the hot water circulation tank 2 can be replenished to the alkali circulation tank 1 using the second transition pipe 1c, so that the industrial water after water washing can be used for the preparation of alkali washing solution.

[0032] From an overall perspective, regarding input, this solution involves only one industrial water inlet, which replenishes the spray return water tank 4, hot water tank 3, hot water circulation tank 2, and alkali circulation tank 1. Besides the industrial water inlet, there is only one raw alkali inlet pipe 1d, used to replenish the raw alkali solution. Regarding output, there are only two discharge pipes for waste disposal when liquid impurities no longer meet usage requirements.

[0033] Thus, this solution enables the multiple reuse of industrial water, ensuring the cleaning quality and cooling effect of the strip steel while achieving water conservation.

[0034] In some implementation methods, please refer to Figure 1 The water-saving control system includes a first plate thermometer 45 and a second plate thermometer 46. The first plate thermometer 45 and the second plate thermometer 46 are respectively installed on the front and rear sides of the spray cooler 250. During operation, the strip steel 100 passes through the annealing furnace 240, the first plate thermometer 45, the spray cooler 250 and the second plate thermometer 46 in sequence.

[0035] Please refer to Figure 1The water-saving control system includes a water temperature monitor 47. The spray return water pipe 4b includes a water storage section at the end, which is directly connected to the spray return water tank 4, so that the water storage section can still be filled with water when the spray cooler 250 is not running. The water temperature monitor 47 is installed in the water storage section. When the spray cooler 250 is not running, the industrial water in the spray return water tank 4 remains in the water storage section, and the water temperature monitor 47 reflects the water temperature. When the spray cooler 250 is running, hot water returns from the spray return water pipe 4b to the spray return water tank 4, and the water temperature monitor 47 reflects the liquid level in the spray return water pipe 4b.

[0036] To achieve the functional limitations of the aforementioned water storage section, the water storage section can be as follows: Figure 1 It can be arranged horizontally along the center line or at an angle.

[0037] The target temperature mentioned below refers to the maximum permissible temperature of strip 100 after being cooled by spray cooler 250. In other words, if the temperature of strip 100 after spray cooling is below the target temperature, the cooling requirement is met. The target temperature is generally around 45℃. The following description is divided into two aspects: the temperature measured by the first plate thermometer 45 is greater than the temperature measured by the water temperature monitor 47, and the temperature measured by the first plate thermometer 45 is less than the temperature measured by the water temperature monitor 47.

[0038] When the temperature measured by the first plate thermometer 45 is greater than the temperature measured by the water temperature monitor 47, the spray pump 41 and the spray connecting valve 43 are opened, and the spray industrial water valve 44 is closed. The heat of the strip steel 100 is carried away by the return water of the water spray cooler 250, which reduces the temperature of the strip steel 100 and sprays the strip steel 100 for cooling.

[0039] When the temperature measured by the second thermometer 46 is lower than the target temperature, which is generally around 45°C, it indicates that the cooling capacity meets the standard and heat exchange can continue. Keep the spray pump 41 and the spray connecting valve 43 open, and the spray industrial water valve 44 closed.

[0040] When the temperature measured by the first thermometer 45 is higher than the temperature measured by the water temperature monitor 47, but the temperature measured by the second thermometer 46 is higher than the target temperature, it indicates that the cooling method described above does not meet the requirements. The valves are then adjusted to open the industrial water spray valve 44, close the spray connecting valve 43, open the hot water spray valve 42, and activate the spray pump 41, using industrial water at approximately 25°C for cooling. The hot water is pumped into the hot water tank 3. This further reduces the temperature of the strip steel 100 until the temperature measured by the second thermometer 46 is lower than the target temperature.

[0041] When the temperature measured by the first thermometer 45 is higher than the temperature measured by the water temperature monitor 47, and the temperature measured by the second thermometer 46 returns to below the target temperature, and the hot water spray valve 42 has been open for a sufficient period of time, it indicates that the hot water in the spray return tank 4 has been discharged. At this time, the spray pump 41 and the spray connecting valve 43 are opened, and the hot water spray valve 42 and the industrial water spray valve 44 are closed, spraying and cooling the strip steel 100, returning to the above steps.

[0042] When the temperature measured by the first plate thermometer 45 is lower than the temperature measured by the water temperature monitor 47, the situation may be that the annealing furnace 240 is not heated and the strip steel 100 is at a low temperature. At this time, it is a non-production state and heat exchange is not required. Therefore, the spray pump 41, spray hot water valve 42, spray connecting valve 43 and spray industrial water valve 44 are all in the closed state, and the spray cooling system is not put into use.

[0043] In some implementation methods, please refer to Figure 1 A water replenishment flow meter 23 is installed in the second transition pipe 1c, and an alkali flow meter 13 is installed in the original alkali inlet pipe 1d. The original alkali and water are replenished into the alkali circulation tank 1 through the flow meters.

[0044] In detail, based on the decrease in the alkali level in the alkali circulation tank 1, alkali needs to be replenished. This is done by opening the alkali supply valve 12 and the water supply valve 22 to replenish the original alkali and water to the alkali circulation tank 1. The required amount of alkali and industrial water to be replenished is measured by the water supply flow meter 23 and the alkali flow meter 13. After replenishment is completed, the alkali supply valve 12 and the water supply valve 22 are closed to ensure that the alkali level in the alkali circulation tank 1 is met.

[0045] The formula for calculating the required water replenishment is as follows: Required water replenishment = (Original alkali concentration - Target alkali concentration) * Cumulative flow rate of original alkali solution / Target alkali concentration.

[0046] Based on the hot water consumption of the hot water circulation tank 2, the hot water return valve 32 is closed periodically, the liquid level in the water spray zone 222 is raised periodically, and the hot water circulation tank 2 receives excess hot water replenishment through the hot water circulation return pipe 2b.

[0047] Based on the water level consumption of hot water tank 3 and the hot water replenishment of spray return water tank 4, when the water level of hot water tank 3 is too high, the drain valve on the drain pipe connected to hot water tank 3 is opened. When the water level of hot water tank 3 is too low, the spray hot water valve 42 is opened. This ensures that the water level of hot water tank 3 remains stable.

[0048] Based on the cleaning quality of the alkali solution in the alkali solution circulation tank 1, waste is discharged periodically through the waste discharge valve on the waste discharge pipe connected to the alkali solution circulation tank 1 to ensure the alkali solution is clean.

[0049] When the annealing furnace 240 is not heated and does not require outlet water spray cooling, both the hot water circulation tank 2 and the hot water tank 3 have their own water supply and are equipped with additional water supply pipes. When the liquid level is too low, their own water supply valves are triggered to open.

[0050] When the annealing furnace at 240°C is not heated and only the cleaning section is activated, the production line is washing coils, which is not considered normal production. This situation is rare.

[0051] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0052] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A strip steel annealing line water conservation control system characterized by, The strip steel passes sequentially through an alkaline washing tank, a water washing tank, an annealing furnace, and a spray cooler in the annealing unit. The water washing tank includes a water brush zone and a water spray zone arranged sequentially along the running direction of the strip steel. The water-saving control system includes: An industrial water inlet pipe is connected at one end to an industrial water source and at the other end to the inlet of the spray cooler. The industrial water inlet pipe is equipped with a spray industrial water valve. A spray return water tank is connected to the spray cooler via a spray inlet pipe and a spray return water pipe, respectively. A spray pump and a spray connecting valve are installed on the spray inlet pipe. The spray pump is closer to the spray return water tank on the spray inlet pipe than the spray connecting valve. A hot water tank is connected to the water spray area of ​​the washing tank through a hot water inlet pipe and a hot water return pipe respectively. The hot water tank is connected to the spray inlet pipe through a first transition pipe between the spray pump and the spray connecting valve. A hot water pump is installed on the hot water inlet pipe, a hot water return valve is installed on the hot water return pipe, and a spray hot water valve is installed on the first transition pipe. A hot water circulation tank is connected to the water brush area of ​​the washing tank through a hot water circulation inlet pipe and a hot water circulation return pipe, respectively, and a hot water circulation pump is installed in the hot water circulation inlet pipe; An alkali circulation tank is connected to the alkali washing tank via an alkali circulation inlet pipe and an alkali circulation return pipe. The alkali circulation tank is connected to the hot water circulation inlet pipe via a second transition pipe between the hot water circulation pump and the washing tank. The alkali circulation tank is connected to the raw alkali inlet pipe for conveying raw alkali. An alkali circulation pump is installed on the alkali circulation inlet pipe. A water replenishment valve is installed on the second transition pipe. An alkali supply valve is installed on the raw alkali inlet pipe. The washing tank has a vertically installed baffle on the bottom side of its inner wall. The baffle is lower than the position where the strip steel passes through the washing tank. Both the hot water tank and the alkali circulation tank are connected to a waste discharge pipe with a waste discharge valve.

2. The strip steel annealing mill water conservation control system of claim 1 wherein, A water supply flow meter is installed in the second transition pipe, and an alkali flow meter is installed in the original alkali inlet pipe.

3. The strip steel annealing train water conservation control system of claim 2, wherein, When it is necessary to replenish the alkali solution in the alkali solution circulation tank, the original alkali solution and the water replenishment valve are opened to replenish the alkali solution circulation tank. The required amount of water replenishment = (original alkali solution concentration - target alkali solution concentration) * original alkali solution cumulative flow rate / target alkali solution concentration.

4. The strip steel annealing line water conservation control system of any one of claims 1-3, wherein, The water-saving control system includes a first thermometer, a second thermometer, and a water temperature monitor; The first plate thermometer and the second plate thermometer are respectively installed on the front and rear sides of the spray cooler. During operation, the strip steel passes through the annealing furnace, the first plate thermometer, the spray cooler and the second plate thermometer in sequence. The spray return water pipe includes a water storage section at the end, which is directly connected to the spray return water tank so that the water storage section can be filled with water even when the spray cooler is not running, and the water temperature monitor is installed in the water storage section.

5. The water-saving control system for strip annealing units as described in claim 4, characterized in that, The water storage section is arranged horizontally.

6. The water-saving control system for strip annealing units as described in claim 1, characterized in that, Based on the hot water consumption of the hot water circulation tank, the hot water return valve is periodically closed to periodically raise the liquid level in the water spray area, and the hot water circulation tank is replenished with excess hot water through the hot water circulation return pipe.

7. The water-saving control system for strip annealing units as described in claim 1, characterized in that, When the liquid level in the hot water tank is too high, the drain valve on the drain pipe connected to the hot water tank is opened. When the liquid level in the hot water tank is too low, the hot water spray valve is turned on.

8. The water-saving control system for strip annealing units as described in claim 1, characterized in that, Based on the cleaning quality of the alkali solution in the alkali solution circulation tank, waste is discharged periodically through the waste discharge valve on the waste discharge pipe connected to the alkali solution circulation tank to ensure the cleanliness of the alkali solution.

9. The water conservation control system for a steel strip annealing train of claim 4 wherein, When the temperature measured by the first plate thermometer is lower than the temperature measured by the water temperature monitor, the spray pump, the spray hot water valve, the spray connecting valve, and the spray industrial water valve are all in the closed state.

10. The water conservation control system for a steel strip annealing train of claim 4 wherein, When the temperature measured by the first plate thermometer is greater than the temperature measured by the water temperature monitor, the spray pump and the spray connecting valve are opened, and the spray industrial water valve is closed to spray and cool the strip steel. When the temperature measured by the second plate thermometer is lower than the target temperature, the spray pump and the spray connecting valve are kept open, and the spray industrial water valve is kept closed. When the temperature measured by the second plate thermometer is higher than the target temperature, the industrial water valve for spraying is opened, the connecting valve for spraying is closed, the hot water valve for spraying is opened, and the spray pump is operated until the temperature measured by the second plate thermometer is lower than the target temperature. When the temperature measured by the second thermometer returns to below the target temperature, the spray pump and the spray connecting valve are opened, and the spray hot water valve and the spray industrial water valve are closed to spray and cool the strip steel. The target temperature is the maximum allowable temperature of the strip after it has been cooled by the spray cooler.

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