Method and system for replenishing circulating cooling water of blast furnace water station

Abstract

The application provides a blast furnace water station circulating cooling water replenishing method and system. The blast furnace water station circulating cooling water replenishing method comprises the following steps: acquiring the liquid level of the clean circulating water pool in real time; if the liquid level is lower than the first liquid level threshold and higher than or equal to the second liquid level threshold, the float ball valve on the reclaimed water replenishing pipeline is automatically opened under the action of gravity, and the reclaimed water is used for replenishing; if the liquid level is lower than the second liquid level threshold and higher than or equal to the third liquid level threshold, the float ball valve on the fresh water replenishing pipeline is automatically opened under the action of gravity, and the fresh water is used for replenishing. In the application, the whole replenishing control process is completely completed by the mechanical components such as the float ball valve under the action of buoyancy, without any electric control elements, so that the replenishing paralysis hidden danger caused by the electric control failure is avoided, the safety and reliability of the blast furnace cooling water system are improved, the efficient utilization of water resources is realized, and the operation cost is reduced.

Description

Technical Field

[0001] This application relates to the field of water treatment technology, and in particular to a method and system for replenishing circulating cooling water in blast furnace water stations. Background Technology

[0002] The circulating cooling water system of a blast furnace water station plays a crucial role in providing indirect cooling for the blast furnace body, hot blast stove, and other equipment. Because the blast furnace smelting process operates under extreme conditions of high temperature and high pressure, the continuity and safety of the circulating cooling water system directly affect the production safety of the blast furnace. Traditional water replenishment processes rely entirely on fresh industrial water (hereinafter referred to as fresh water), which not only consumes a large amount of precious water resources but also incurs high operating costs. To achieve energy conservation and emission reduction goals, the industry has begun to explore using recycled water to replace fresh water in replenishing the system.

[0003] However, the volume and quality of reclaimed water fluctuate significantly, with its salinity, hardness, and chloride ion concentration typically much higher than that of fresh water, making it highly susceptible to scaling, corrosion, and microbial growth in cooling systems. Furthermore, the supply of reclaimed water is greatly affected by the operating conditions of upstream wastewater treatment plants, resulting in significant uncertainty. Achieving a reliable and economical switch between reclaimed and fresh water without relying on complex electrical control systems is a current technical challenge.

[0004] A related technology discloses a water replenishment system. This system uses a float, connecting rod, limit switch, relay, and solenoid valve to form an electrical control circuit, enabling automatic water replenishment by opening the valve at the lower limit of the water tank level and automatic valve closing at the upper limit. While this system achieves automatic water replenishment, its control logic relies on electrical components such as limit switches and relays. Under the harsh conditions of high temperature, high humidity, and strong electromagnetic interference at the blast furnace site, the electrical control system is susceptible to water replenishment failure due to power outages, signal transmission interruptions, or component jamming. A malfunction could potentially lead to a safety accident involving dry burning of the blast furnace due to water shortage, indicating insufficient safety and reliability.

[0005] Another related technology discloses a stepped automatic water replenishment method, which uses an electric water replenishment valve and a float device. Priority is set through a control system to achieve stepped utilization of multiple water sources. This scheme emphasizes the economic efficiency of water source selection, but the implementation of its water replenishment logic still highly depends on the control system and electric actuators. In the event of a power outage or control unit failure, the electric valve will be unable to perform any action, causing the entire water replenishment system to fail and compromising the continuity of blast furnace cooling. Summary of the Invention

[0006] This application provides a method and system for replenishing circulating cooling water in a blast furnace water station to solve the above-mentioned technical problems.

[0007] To achieve the above objectives, the technical solution of this application is as follows: This application provides a method for replenishing circulating cooling water in a blast furnace water station. The method is based on a blast furnace water station circulating cooling water replenishment system, which includes a clean circulating water tank and a recycled water replenishment pipeline and a fresh water replenishment pipeline connected in parallel to the tank. Both the recycled water replenishment pipeline and the fresh water replenishment pipeline are equipped with float valves. The recycled water replenishment pipeline and the fresh water replenishment pipeline are used to transport recycled water and fresh water, respectively. The liquid level trigger thresholds of the float valves located on the recycled water replenishment pipeline and the fresh water replenishment pipeline correspond to a first liquid level threshold and a second liquid level threshold of the clean circulating water tank, respectively, where the second liquid level threshold is less than the first liquid level threshold. The method for replenishing circulating cooling water in the blast furnace water station includes the following steps: The liquid level of the circulating water tank is acquired in real time; If the liquid level in the clean circulating water tank is lower than the first liquid level threshold and higher than or equal to the second liquid level threshold, the float valve located on the recycled water replenishment pipeline will automatically open under the action of gravity to replenish water using recycled water. If the liquid level in the clean circulation water tank is lower than the second liquid level threshold but higher than or equal to the third liquid level threshold, the float valve located on the new water supply pipeline will automatically open under the action of gravity to replenish the water with new water. The third liquid level threshold is lower than the second liquid level threshold.

[0008] In one embodiment of this application, the method for replenishing circulating cooling water in the blast furnace water station further includes the following steps: If the liquid level in the circulating water tank is higher than or equal to the first liquid level threshold, both float valves will automatically close under buoyancy to stop water replenishment.

[0009] In one embodiment of this application, the difference between the first liquid level threshold and the second liquid level threshold is 0.3m-0.5m.

[0010] In one embodiment of this application, before the recycled water is added to the clean circulating water pool, the method for replenishing the circulating cooling water of the blast furnace water station further includes the following steps: Monitor the conductivity and / or hardness and / or chloride ion concentration and / or pH value and / or turbidity of the recycled water; If the conductivity and / or hardness and / or chloride ion concentration and / or pH value and / or turbidity are not within the corresponding preset range, an agent is added to the recycled water to control the conductivity and / or hardness and / or chloride ion concentration and / or pH value and / or turbidity of the recycled water within the corresponding preset range.

[0011] In one embodiment of this application, the method for replenishing circulating cooling water in the blast furnace water station further includes the following steps: Monitor the conductivity and / or hardness and / or chloride ion concentration and / or pH value and / or turbidity of the circulating cooling water in the clean loop water tank; If the conductivity and / or hardness and / or chloride ion concentration and / or pH value and / or turbidity are not within the corresponding preset range, a chemical agent is added to the clean circulation tank. The chemical agent includes corrosion and scale inhibitors, dispersants, copper corrosion inhibitors, and oxidizing bactericides.

[0012] In one embodiment of this application, the method for replenishing circulating cooling water in the blast furnace water station further includes the following steps: Based on water quality monitoring data and the preset range of corresponding evaluation indicators, the qualified status of the corresponding evaluation indicators is determined, and the qualified status includes qualified and unqualified. The pass rate of circulating cooling water quality is determined based on the pass status of all evaluation indicators and the total number of evaluation indicators.

[0013] In one embodiment of this application, determining the pass rate of circulating cooling water quality includes the following steps: Based on the qualified status of all evaluation indicators, determine the total number of evaluation indicators that are qualified. The circulating cooling water quality pass rate is determined based on the total number of evaluation indicators that are qualified and the total number of evaluation indicators.

[0014] In one embodiment of this application, the clean circulating water tank is connected to a circulating water outlet pipe and a circulating water inlet pipe. The circulating water outlet pipe is connected to a bypass pipe, which is connected to the circulating water inlet pipe. A filter is provided on the bypass pipe. The method for replenishing circulating cooling water in the blast furnace water station further includes the following steps: The circulating cooling water in the clean loop water tank is drawn out through the bypass pipe as bypass water, and after being purified by the filter, the bypass water flows back to the clean loop water tank through the circulating water inlet pipe.

[0015] This application also provides a blast furnace water station circulating cooling water makeup system, the blast furnace water station circulating cooling water makeup system comprising: The circulating water tank is equipped with a level gauge. A recycled water replenishment pipeline is connected to the clean circulating water tank for transporting recycled water; The fresh water supply pipeline is connected in parallel with the recycled water supply pipeline to the clean circulation water tank for transporting fresh water; Both the recycled water supply pipeline and the fresh water supply pipeline are equipped with float valves, each float valve comprising a float. The liquid level trigger thresholds of the float valves on the recycled water supply pipeline and the fresh water supply pipeline correspond to the first liquid level threshold and the second liquid level threshold of the clean circulation water tank, respectively, where the second liquid level threshold is less than the first liquid level threshold. If the liquid level of the clean circulation water tank is lower than the first liquid level threshold but higher than or equal to the second liquid level threshold, the float valve on the recycled water supply pipeline automatically opens under gravity to replenish the water using recycled water. If the liquid level of the clean circulation water tank is lower than the second liquid level threshold but higher than or equal to the third liquid level threshold, the float valve on the fresh water supply pipeline automatically opens under gravity to replenish the water using fresh water, where the third liquid level threshold is less than the second liquid level threshold.

[0016] In one embodiment of this application, the clean circulating water tank is connected to a circulating water outlet pipe and a circulating water inlet pipe, the circulating water outlet pipe is connected to a bypass pipe, the bypass pipe is connected to the circulating water inlet pipe, and a filter is provided on the bypass pipe.

[0017] The beneficial effects of this application are: This application constructs a purely mechanical, self-reliant water replenishment control system that does not rely on electronic control components or manual intervention. The system utilizes float valves installed on both the recycled water replenishment pipeline and the fresh water replenishment pipeline. The liquid level trigger thresholds of these float valves correspond to the first and second liquid level thresholds of the clean circulating water tank, respectively. The second liquid level threshold is lower than the first liquid level threshold, thus achieving a redundant water replenishment strategy of "recycled water priority, fresh water emergency." When the liquid level in the clean circulating water tank drops below the first liquid level threshold (i.e., the high liquid level threshold) but above or equal to the second liquid level threshold (i.e., the intermediate liquid level threshold), the float valve on the recycled water replenishment pipeline automatically opens under gravity, prioritizing the replenishment of recycled water and maximizing the utilization of reclaimed water resources. Only when the amount of recycled water is insufficient, causing the liquid level in the circulating water tank to fall below the second liquid level threshold (i.e., the intermediate liquid level threshold) but above or equal to the third liquid level threshold (i.e., the low liquid level threshold), will the float valve located on the fresh water supply pipeline automatically open under gravity, introducing fresh water for emergency replenishment and ensuring replenishment safety. The entire control process is completed autonomously by mechanical components such as the float valve under buoyancy, without any electrical control components. This avoids the potential for replenishment paralysis due to electrical control failures such as power outages or signal transmission interruptions, improving the safety and reliability of the blast furnace cooling water system, while simultaneously achieving efficient water resource utilization and reduced operating costs. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0019] In the attached diagram: Figure 1 A schematic diagram of the structure of a blast furnace water station circulating cooling water makeup system provided as an exemplary embodiment of this application; Figure 2 for Figure 1 A schematic diagram of the structure of a floating ball valve.

[0020] The attached figures are labeled as follows: Clean circulation water tank 1, first liquid level line 11, second liquid level line 12, third liquid level line 13; Float valve 2, main valve body 21, auxiliary water pipe 22, float handle 23, float 24, water level controller 25; Filter 3; 4 water quality monitoring agencies; Drug dispensing facility 5. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] It should be noted that all directional indicators (such as up, down, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0023] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] Furthermore, the use of terms such as "first," "second," and "third" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0025] Please see Figure 1 , Figure 1 This is a schematic diagram of a blast furnace water station circulating cooling water makeup system provided as an exemplary embodiment of this application. The blast furnace water station circulating cooling water makeup system includes a clean circulating water tank 1, a recycled water makeup pipeline, and a fresh water makeup pipeline. Both the recycled water makeup pipeline and the fresh water makeup pipeline are equipped with float valves 2.

[0026] Please continue reading Figure 1 The clean circulating water tank 1 serves as a storage tank for the blast furnace water station's circulating cooling water makeup system, used to store circulating cooling water. The volume of the clean circulating water tank 1 is greater than 2000 m³. 3The circulating water tank 1 is equipped with a level signal feedback control system (not shown). This system includes a level gauge and is existing technology, so it will not be described in detail here. From top to bottom, the circulating water tank 1 is sequentially equipped with a first level line 11, a second level line 12, and a third level line 13. The first level line 11 corresponds to a first level threshold (i.e., a high level alarm value), the second level line 12 corresponds to a second level threshold (i.e., an intermediate level alarm value), and the third level line 13 corresponds to a third level threshold (i.e., a low level alarm value). Clearly, the third level threshold is less than the second level threshold, and the second level threshold is less than the first level threshold. For example, the first level line 11 is 3.4m, and the first level threshold corresponding to this level line is the level trigger threshold of the float valve 2 located on the recycled water supply pipeline. The second liquid level line 12 is 3.0m, and the corresponding second liquid level threshold is the liquid level trigger threshold of the float valve 2 located on the new water supply pipeline. The third liquid level line 13 is 2.0m. The clean circulation water tank 1 is equipped with a water quality monitoring mechanism 4 and a chemical dosing mechanism 5. The water quality monitoring mechanism 4 is used to monitor the conductivity and / or hardness and / or chloride ion concentration and / or pH value and / or turbidity of the circulating cooling water in the clean circulation water tank 1. The water quality monitoring mechanism 4 can use water quality sensors, such as multi-parameter water quality sensors, such as conductivity sensors, hardness sensors, chloride ion sensors, pH sensors, and turbidity sensors. Multi-parameter water quality sensors, conductivity sensors, hardness sensors, chloride ion sensors, pH sensors, and turbidity sensors are existing technologies and will not be described in detail here. Alternatively, water hardness, chloride ion concentration, pH value, and turbidity can be detected manually. For example, water hardness and chloride ion concentration can be detected by titration, pH value can be detected by a pH meter, and turbidity can be detected by spectrometry. The dosing mechanism 5 is used to adjust the circulating cooling water according to monitoring results, controlling the conductivity and / or hardness and / or chloride ion concentration and / or pH value and / or turbidity of the circulating cooling water within corresponding preset ranges. The chemicals include one or more of the following: corrosion and scale inhibitors, copper corrosion inhibitors, dispersants, and oxidizing bactericides. The dosing mechanism 5 includes a variable frequency metering pump, which can adjust the dosage of the chemicals. Dosing mechanisms with variable frequency metering pumps (e.g., dosing devices) are existing technology and will not be described further here. The clean circulating water tank 1 is connected to a circulating water outlet pipe and a circulating water inlet pipe, with the circulating water outlet pipe connected to the circulating water inlet pipe. The circulating water outlet pipe is connected to a bypass pipe, which is connected to the circulating water inlet pipe. A filter 3 is installed on the bypass pipe. The circulating cooling water drawn from the circulating water outlet pipe serves as bypass water. The filter 3 is used to purify the bypass water, removing suspended solids, colloids, and other impurities through physical interception and other processes. Filter 3 can be a quartz sand filter, which is existing technology and will not be described in detail here.After being purified by filter 3, the bypass water can flow back to the clean circulating water tank 1 through the circulating water inlet pipe, which can effectively ensure the water quality of the circulating cooling water.

[0027] Please continue reading Figure 1 and Figure 2The recycled water supply pipeline is used to transport reclaimed water from the wastewater deep treatment station, and its outlet is connected to the clean circulating water tank 1. A float valve 2 is installed on the recycled water supply pipeline, and the liquid level trigger threshold of the float valve 2 corresponds to the first liquid level threshold of the clean circulating water tank 1. The fresh water supply pipeline is used to transport fresh water, and its outlet is connected to the clean circulating water tank 1 in parallel with the outlet of the recycled water supply pipeline. A float valve 2 is installed on the fresh water supply pipeline, and the liquid level trigger threshold of the float valve 2 corresponds to the second liquid level threshold of the clean circulating water tank 1. The float valve 2 includes a main valve body 21, an auxiliary water pipe 22, a float handle 23, a float 24, and a water level controller 25. The main valve body 21 is installed on the supply pipeline and is opened and closed by the pressure of the medium itself and the differential pressure between the upper and lower chambers of the main valve body. The auxiliary water pipe 22 is used to connect the upper chamber of the main valve body to the water level controller 25 to transmit and release control pressure. The first end of the auxiliary water pipe 22 is connected to the upper cavity of the main valve body 21, and the second end of the auxiliary water pipe 22 is connected to the water level controller 25. The float handle 23 acts as a lever mechanism connecting the float 24 and the water level controller 25, transmitting the buoyancy displacement of the float 24 as the liquid level rises and falls to the trigger end of the water level controller 25. The float 24 is a hollow sealed sphere that rises and falls with the liquid level fluctuations in the circulating water tank 1, providing physical driving force. The water level controller 25 controls the opening and closing of the auxiliary water pipe 22 by the rise and fall of the float 24, thereby using the hydraulic differential pressure to drive the diaphragm of the main valve body 21 to open and close the valve. The opening and closing of the valve core inside the water level controller 25 is controlled by the float 24 through the lever linkage of the float handle 23. When the liquid level in the circulating water tank 1 drops, the float 24 sinks, driving the valve core inside the water level controller 25 to open through the float handle 23, opening the auxiliary water pipe 22, and releasing the pressure in the upper cavity of the main valve body 21 through the auxiliary water pipe 22. At this time, a pressure difference is formed between the upper and lower chambers of the main valve body 21. The valve disc of the main valve body 21 is pushed up under the pressure of the water inlet in the pipeline, and water replenishment begins. When the liquid level rises, the float 24 floats up, and through the float handle 23, it drives the valve core inside the water level controller 25 to close, the auxiliary water pipe 22 is cut off, the pressure in the upper chamber of the main valve body 21 gradually accumulates and tends to be balanced with the water inlet pressure in the pipeline, and the valve disc of the main valve body 21 slowly and smoothly falls back to close under the action of differential pressure, stopping water replenishment. The height of the liquid level contact point of the float 24 of the float valve 2 located on the recycled water supply pipeline is higher than the height of the liquid level contact point of the float 24 of the float valve 2 located on the fresh water supply pipeline. Furthermore, the height difference of the liquid level contact points between the two floats 24 is equal to the difference between the first liquid level threshold and the second liquid level threshold. In other words, the height difference of the liquid level contact points between the floats 24 of the float valve 2 located on the recycled water supply pipeline and the float 24 of the float valve 2 located on the fresh water supply pipeline is equal to the difference between their corresponding liquid level trigger thresholds.For example, the difference between the first liquid level threshold and the second liquid level threshold is 0.3m-0.5m. For instance, the height of the first liquid level line 11 corresponding to the liquid level trigger threshold of the float valve 2 located on the recycled water supply pipeline is 3.4m, and the height of the second liquid level line 12 corresponding to the liquid level trigger threshold of the float valve 2 located on the fresh water supply pipeline is 3.0m. Clearly, the height difference between the liquid level lines corresponding to the liquid level trigger thresholds of the two float valves 2 is 0.4m. The float valve 2 located on the recycled water supply pipeline is configured to automatically open under gravity when the liquid level in the clean circulating water tank 1 is lower than the first liquid level threshold but higher than or equal to the second liquid level threshold, using recycled water for replenishment. The float valve 2 located on the fresh water supply pipeline is configured to automatically open under gravity when the liquid level in the tank is lower than the second liquid level threshold but higher than or equal to the third liquid level threshold, using fresh water for replenishment. Furthermore, both the float valve 2 on the recycled water replenishment pipeline and the float valve 2 on the fresh water replenishment pipeline are configured to automatically close under buoyancy when the liquid level in the clean circulating water tank 1 rises to above or equal to the first liquid level. That is, in this embodiment, the outlets of the recycled water replenishment pipeline and the fresh water replenishment pipeline are connected to the clean circulating water tank 1 in parallel, operating independently. Maintenance or failure of either pipeline does not affect the replenishment capacity of the other pipeline, forming a dual-source redundancy structure. A water quality monitoring mechanism 4 and a chemical dosing mechanism 5 are also installed on the recycled water replenishment pipeline. The water quality monitoring mechanism 4 is used to monitor the conductivity and / or hardness and / or chloride ion concentration and / or pH value and / or turbidity of the recycled water. The water quality monitoring mechanism 4 can employ a water quality sensor, such as a conductivity sensor, which is existing technology and will not be described further here. Water hardness, chloride ion concentration, pH value, and turbidity can be manually tested. For example, water hardness and chloride ion concentration can be tested by titration, pH value by a pH meter, and turbidity by spectrometry. The dosing mechanism 5 is used to adjust the reclaimed water according to the test results, so that its pH value, conductivity, hardness, turbidity, and chloride ion concentration are controlled within corresponding preset ranges. This is achieved by adding one or more agents such as corrosion and scale inhibitors, copper corrosion inhibitors, dispersants, and oxidizing bactericides to control the conductivity and / or hardness and / or chloride ion concentration and / or pH value and / or turbidity of the reclaimed water within the corresponding preset ranges. The dosing mechanism 5 includes a variable frequency metering pump, which can adjust the dosage of the agent. Dosing mechanisms with variable frequency metering pumps (e.g., dosing devices) are existing technology and will not be described further here.

[0028] The principle of this embodiment is as follows: By installing float valves 2 on both the recycled water replenishment pipeline and the fresh water replenishment pipeline, and with the liquid level trigger thresholds of the float valves 2 on the recycled water replenishment pipeline and the fresh water replenishment pipeline corresponding to the first liquid level threshold and the second liquid level threshold of the clean circulation water tank, respectively, the second liquid level threshold is lower than the first liquid level threshold, thus realizing a redundant water replenishment strategy of "recycled water priority, fresh water emergency". When the liquid level of the clean circulation water tank 1 drops below the first liquid level threshold but above or equal to the second liquid level threshold, the float valve 2 on the recycled water replenishment pipeline automatically opens under the action of gravity, prioritizing the replenishment of recycled water and maximizing the utilization of reclaimed water resources. Only when the amount of recycled water is insufficient, causing the liquid level of the clean circulation water tank 1 to drop below the second liquid level threshold but above or equal to the third liquid level threshold, the float valve 2 on the fresh water replenishment pipeline automatically opens under the action of gravity, introducing fresh water for emergency replenishment, ensuring water replenishment safety. The entire control process is completed automatically by mechanical components such as float valve 2 under the action of buoyancy, without the need for any electrical control components. This avoids the potential for water replenishment paralysis caused by electrical control failures such as power outages and signal transmission interruptions, improves the safety and reliability of the blast furnace cooling water system, and achieves efficient utilization of water resources and reduction of operating costs.

[0029] Another embodiment of this application provides a method for replenishing circulating cooling water in a blast furnace water station based on the above system, including the following steps: The liquid level of the clean circulating water tank 1 is obtained in real time through the liquid level signal feedback control system; When the liquid level in the clean circulating water tank 1 drops due to consumption and falls below the first liquid level line 11 (e.g., 3.4m) but is higher than or equal to the second liquid level line 12 (e.g., 3.0m), the float 24 of the float valve 2 located on the recycled water replenishment pipeline drops with the liquid level and drives the valve to open automatically under the action of gravity, thus starting the recycled water replenishment. Under most operating conditions, the amount of recycled water replenishment is sufficient to make up for the system consumption. The liquid level of the clean circulating water tank 1 fluctuates within the range between the first liquid level line 11 and the second liquid level line 12. At this time, only the recycled water replenishment pipeline participates in water replenishment, while the fresh water replenishment pipeline remains closed. If, under specific operating conditions, the amount of recycled water replenishment is insufficient or there is no recycled water, such as a decrease in the reclaimed water production of the wastewater deep treatment station, insufficient pressure in the recycled water pipeline network, or maintenance of the recycled water pipeline, the liquid level in the clean circulation tank 1 will continue to drop. When the liquid level in the clean circulation tank 1 further drops to below the second liquid level line 12 (e.g., 3.0m) but above or equal to the third liquid level line 13 (2.0m), the float valve 2 located on the fresh water replenishment pipeline will automatically open under gravity, initiating emergency fresh water replenishment. At this time, the system forms a dual-replenishment mode of "recycled water plus fresh water," making up the water shortage and ensuring that the liquid level in the clean circulation tank 1 is always above or equal to the third liquid level line 13.

[0030] When the replenishment water volume exceeds the consumption volume, the liquid level in the clean circulation tank 1 begins to rise. When the liquid level in the clean circulation tank 1 rises to above or equal to the first liquid level line 11 (e.g., 3.4m), the floats 24 of both the float valve 2 on the recycled water replenishment pipeline and the float valve 2 on the fresh water replenishment pipeline rise with the liquid level, and both valves automatically close under the action of buoyancy, stopping the replenishment of water. Subsequently, as the system continues to consume water, when the liquid level falls below the first liquid level line 11 again, the float valve 2 on the recycled water replenishment pipeline reopens, and the cycle repeats, thereby achieving automatic maintenance of the liquid level in the clean circulation tank 1. For example, the circulation flow rate of the clean circulation tank 1 is 700m³. 3 / h-800m 3 / h.

[0031] During this process, the conductivity, hardness, chloride ion concentration, and pH value of the reclaimed water are monitored by water quality monitoring agency 4, and the reclaimed water is adjusted according to the monitoring results. For example, the water quality indicators of the reclaimed water are controlled within the following preset ranges: pH value 7.5 ± 0.2, conductivity less than or equal to 1300 μs / cm, hardness less than or equal to 250 mg / L; turbidity less than or equal to 10.0 NTU; chloride ion concentration less than or equal to 200 mg / L. In specific operations, the appropriate methods can be flexibly selected based on the monitoring results. For example, if the pH value of the reclaimed water deviates from the preset range, it can be adjusted by adding acidic or alkaline agents; if the hardness or conductivity is too high, it can be homogenized and diluted by mixing with other low-concentration water sources; if the turbidity is too high, it can be treated by pre-filtration or other methods. The above adjustment methods can be used individually or in combination, as long as the various water quality indicators of the reclaimed water are controlled within the corresponding preset ranges.

[0032] During system operation, the water quality monitoring agency 4 monitors various water quality indicators of the circulating cooling water in the clean loop water tank 1 daily. Based on the daily water quality monitoring data, the dosage and timing of the compound agent composed of corrosion and scale inhibitor, dispersant, copper corrosion inhibitor, and oxidizing bactericide are adjusted in real time. When the water quality monitoring data shows that a certain indicator is close to the threshold, the dosage rate of the corresponding agent is adjusted. For example, the corrosion and scale inhibitor and dispersant are continuously injected into the clean loop system through metering pumps throughout the day, with the corrosion and scale inhibitor flow rate at 24 g / min and the dispersant flow rate at 14 g / min-20 g / min; the copper corrosion inhibitor is directly injected into the clean loop tank at a rate of 2000 g / week; the oxidizing bactericide is added three times a day at different times: 15:00-16:30, 22:00-23:30, and 04:00-05:30, with a flow rate of 780 g / min and automatic dosing. A portion of the circulating cooling water is drawn out as bypass water through the circulating outlet pipe of the clean circulating water tank 1. The bypass water is purified by filter 3. For example, the bypass water volume is controlled at 100m³. 3 / h. When the bypass water flows through filter 3, suspended solids, colloids, and other impurities in the bypass water are intercepted. The clean water obtained after treatment flows back to the clean circulating water tank 1 through the circulating water inlet pipe and mixes with the original circulating cooling water in the tank. Through continuous bypass treatment, the impurity content can be gradually reduced, and the hardness and concentration ratio of the circulating cooling water in the entire clean circulating water tank 1 can be stably controlled within the corresponding preset ranges. For example, the hardness of the circulating cooling water is stably controlled within the range of 180mg / L-220mg / L, for example, 200mg / L; and the concentration ratio of the circulating cooling water is controlled within the range of 2.8 times-3.2 times, for example, 3.0 times.

[0033] Within each preset cycle, based on the water quality monitoring data of the circulating cooling water and the preset range of the corresponding evaluation indicators, the qualification status of the corresponding evaluation indicators is determined. The qualification status includes qualified and unqualified. Specifically, if the evaluation indicator is within the preset range of the corresponding evaluation indicator, the qualification status of the evaluation indicator is qualified; if the evaluation indicator is not within the preset range of the corresponding evaluation indicator, the qualification status of the evaluation indicator is unqualified. The pass rate of circulating cooling water quality is determined based on the pass status of the evaluation indicators and the total number of evaluation indicators. Specifically, the total number of evaluation indicators with a pass status can be determined based on the pass status of all evaluation indicators. The circulating cooling water quality pass rate is determined based on the total number of evaluation indicators that are qualified and the total number of evaluation indicators. Specifically, the quotient obtained by dividing the total number of evaluation indicators that are qualified by the total number of evaluation indicators and multiplying it by 100% is the circulating cooling water quality pass rate.

[0034] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. A method for replenishing circulating cooling water in a blast furnace water station, characterized in that, The blast furnace water station circulating cooling water replenishment method is based on the blast furnace water station circulating cooling water replenishment system. The blast furnace water station circulating cooling water replenishment system includes a clean circulating water tank and a reclaimed water replenishment pipeline and a fresh water replenishment pipeline connected in parallel to the clean circulating water tank. Both the reclaimed water replenishment pipeline and the fresh water replenishment pipeline are equipped with float valves. The reclaimed water replenishment pipeline and the fresh water replenishment pipeline are used to transport reclaimed water and fresh water, respectively. The liquid level trigger thresholds of the float valves located on the reclaimed water replenishment pipeline and the fresh water replenishment pipeline correspond to the first liquid level threshold and the second liquid level threshold of the clean circulating water tank, respectively, where the second liquid level threshold is less than the first liquid level threshold. The method for replenishing circulating cooling water in the blast furnace water station includes the following steps: The liquid level of the circulating water tank is acquired in real time; If the liquid level in the clean circulating water tank is lower than the first liquid level threshold and higher than or equal to the second liquid level threshold, the float valve located on the recycled water replenishment pipeline will automatically open under the action of gravity to replenish water using recycled water. If the liquid level in the clean circulation water tank is lower than the second liquid level threshold but higher than or equal to the third liquid level threshold, the float valve located on the new water supply pipeline will automatically open under the action of gravity to replenish the water with new water. The third liquid level threshold is lower than the second liquid level threshold.

2. The method for replenishing circulating cooling water in a blast furnace water station as described in claim 1, characterized in that, The method for replenishing circulating cooling water in the blast furnace water station also includes the following steps: If the liquid level in the circulating water tank is higher than or equal to the first liquid level threshold, both float valves will automatically close under buoyancy, stopping water replenishment.

3. The method for replenishing circulating cooling water in a blast furnace water station as described in claim 1, characterized in that, The difference between the first liquid level threshold and the second liquid level threshold is 0.3m-0.5m.

4. The method for replenishing circulating cooling water in a blast furnace water station as described in claim 1, characterized in that, Before the recycled water is added to the clean circulating water tank, the following steps are also included: Monitor the conductivity and / or hardness and / or chloride ion concentration and / or pH value and / or turbidity of the recycled water; If the conductivity and / or hardness and / or chloride ion concentration and / or pH value and / or turbidity are not within the corresponding preset range, an agent is added to the recycled water to control the conductivity and / or hardness and / or chloride ion concentration and / or pH value and / or turbidity of the recycled water within the corresponding preset range.

5. The method for replenishing circulating cooling water in a blast furnace water station as described in claim 4, characterized in that, The method for replenishing circulating cooling water in the blast furnace water station also includes the following steps: Monitor the conductivity and / or hardness and / or chloride ion concentration and / or pH value and / or turbidity of the circulating cooling water in the clean loop water tank; If the conductivity and / or hardness and / or chloride ion concentration and / or pH value and / or turbidity are not within the corresponding preset range, a chemical agent is added to the clean circulation tank. The chemical agent includes corrosion and scale inhibitors, dispersants, copper corrosion inhibitors, and oxidizing bactericides.

6. The method for replenishing circulating cooling water in a blast furnace water station as described in claim 5, characterized in that, The method for replenishing circulating cooling water in the blast furnace water station also includes the following steps: Based on water quality monitoring data and the preset range of corresponding evaluation indicators, the qualified status of the corresponding evaluation indicators is determined, and the qualified status includes qualified and unqualified. The pass rate of circulating cooling water quality is determined based on the pass status of all evaluation indicators and the total number of evaluation indicators.

7. The method for replenishing circulating cooling water in a blast furnace water station as described in claim 1, characterized in that, Determining the pass rate of circulating cooling water quality includes the following steps: Based on the qualified status of all evaluation indicators, determine the total number of evaluation indicators that are qualified. The circulating cooling water quality pass rate is determined based on the total number of evaluation indicators that are qualified and the total number of evaluation indicators.

8. The method for replenishing circulating cooling water in a blast furnace water station as described in claim 1, characterized in that, The clean circulating water tank is connected to a circulating water outlet pipe and a circulating water inlet pipe. The circulating water outlet pipe is connected to a bypass pipe, which is connected to the circulating water inlet pipe. A filter is installed on the bypass pipe. The method for replenishing the circulating cooling water of the blast furnace water station also includes the following steps: The circulating cooling water in the clean loop water tank is drawn out through the bypass pipe as bypass water, and after being purified by the filter, the bypass water flows back to the clean loop water tank through the circulating water inlet pipe.

9. A blast furnace water station circulating cooling water makeup system, characterized in that, The blast furnace water station circulating cooling water makeup system includes: The circulating water tank is equipped with a level gauge. A recycled water replenishment pipeline is connected to the clean circulating water tank for transporting recycled water; The fresh water supply pipeline is connected in parallel with the recycled water supply pipeline to the clean circulation water tank for transporting fresh water; Both the recycled water replenishment pipeline and the fresh water replenishment pipeline are equipped with float valves. The liquid level trigger thresholds of the float valves on the recycled water replenishment pipeline and the fresh water replenishment pipeline correspond to the first liquid level threshold and the second liquid level threshold of the clean circulation water tank, respectively, where the second liquid level threshold is less than the first liquid level threshold. If the liquid level of the clean circulation water tank is lower than the first liquid level threshold but higher than or equal to the second liquid level threshold, the float valve on the recycled water replenishment pipeline automatically opens under gravity to replenish the water using recycled water. If the liquid level of the clean circulation water tank is lower than the second liquid level threshold but higher than or equal to the third liquid level threshold, the float valve on the fresh water replenishment pipeline automatically opens under gravity to replenish the water using fresh water, where the third liquid level threshold is less than the second liquid level threshold.

10. The blast furnace water station circulating cooling water makeup system as described in claim 9, characterized in that, The clean water tank is connected to a circulating water outlet pipe and a circulating water inlet pipe. The circulating water outlet pipe is connected to a bypass pipe, which is connected to the circulating water inlet pipe. A filter is installed on the bypass pipe.

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