Seawater circulating cooling system for chemical production

Abstract

The embodiment of the specification provides a seawater circulating cooling system for chemical production. The seawater circulating cooling system for chemical production comprises a seawater taking device, a physical treatment device, a chemical treatment device, a make-up pool, a cooling tower, a circulating water pump, a heat exchange system, a chemical device cooling system and a chemical device which are connected in sequence, the physical treatment device is used for carrying out physical treatment on the seawater and separating the seawater into precipitates and seawater clear liquid; the chemical treatment device is used for electrolyzing the seawater clear liquid by using the electrolysis device to generate sodium hypochlorite and carrying out chemical treatment on the seawater clear liquid flowing to the make-up pool by using the generated sodium hypochlorite; the make-up water tank is used for storing the seawater subjected to chemical treatment and making up circulating water to the cooling tower; the cooling tower is used for cooling the circulating water conveyed by the circulating water pump; the heat exchange system is used for carrying out heat exchange on the cooling system of the chemical device by utilizing circulating water serving as cold fluid; and the chemical device cooling system is used for cooling the chemical device.

Description

Technical Field

[0001] This utility model generally relates to the field of seawater cooling technology, and in particular to a seawater circulating cooling system for chemical production. Background Technology

[0002] In the chemical production sector, due to the often high-temperature processes and prolonged continuous operation of equipment, cooling is crucial for maintaining normal equipment operation and ensuring stable product quality. This is especially true for large chemical enterprises or large chemical bases, which often have numerous production units and complex processes, resulting in a significant demand for cooling water.

[0003] Currently, freshwater resources are becoming increasingly scarce, while seawater resources are abundant. Therefore, designing seawater cooling systems to effectively cool chemical plants is of paramount importance for ensuring stable chemical production, reducing costs, and achieving sustainable development. Utility Model Content

[0004] In view of the above, embodiments of this utility model provide a seawater circulation cooling system for chemical production. Using this seawater circulation cooling system for chemical production, seawater can be treated sequentially through a seawater intake device, a physical treatment device, and a chemical treatment device. The treated seawater is then stored in a replenishment water tank, which replenishes the cooling tower with circulating water. The circulating water cooled by the cooling tower, under the action of a circulating water pump, acts as the cold fluid in the heat exchange system to cool the chemical plant. Thus, through the design of the aforementioned seawater circulation, two-stage cooling mechanism, water waste is reduced, and the normal operation of the chemical plant is ensured.

[0005] According to one aspect of the present invention, a seawater circulating cooling system for chemical production is provided, comprising: a seawater intake device, a physical treatment device, a chemical treatment device, a replenishment water tank, a cooling tower, a circulating water pump, a heat exchange system, a chemical plant cooling system, and a chemical plant, connected in sequence; the physical treatment device is used to physically treat the seawater from the seawater intake device, separating the seawater into precipitate and seawater clear liquid; the chemical treatment device is used to electrolyze the seawater clear liquid using an electrolysis device to generate sodium hypochlorite, and to use the generated sodium hypochlorite to chemically treat the seawater clear liquid flowing to the replenishment water tank; the replenishment water tank is used to store the chemically treated seawater and replenish the circulating water to the cooling tower; the cooling tower is used to cool the circulating water transported by the circulating water pump; the heat exchange system uses the circulating water as a cold fluid to exchange heat with the chemical plant cooling system; and the chemical plant cooling system is used to cool the chemical plant.

[0006] It should be understood that one or more of the above aspects include the features specifically pointed out in the following detailed description and claims. Certain illustrative features of the one or more aspects are set forth in detail in the following specification and drawings. These features merely indicate various ways in which the principles of each aspect can be implemented, and this disclosure is intended to include all such aspects and their equivalents. Attached Figure Description

[0007] A further understanding of the nature and advantages of this specification can be achieved by referring to the following figures. In the figures, similar components or features may have the same reference numerals.

[0008] Figure 1 A schematic diagram of an example of a seawater circulating cooling system for chemical production, according to an embodiment of this specification, is shown.

[0009] Figure 2 A schematic diagram of yet another example of a seawater circulating cooling system for chemical production, according to an embodiment of this specification, is shown.

[0010] Figure 3 A schematic diagram of an example of a seawater collection device according to an embodiment of this specification is shown.

[0011] Figure 4 A schematic diagram of an example of a ball-passing system according to an embodiment of this specification is shown.

[0012] Figure 5 A schematic diagram of yet another example of a seawater circulating cooling system for chemical production, according to an embodiment of this specification, is shown.

[0013] Figure 6 A schematic diagram of an example of a chemical processing apparatus according to an embodiment of this specification is shown. Detailed Implementation

[0014] The subject matter described herein will be discussed below with reference to exemplary embodiments. It should be understood that these embodiments are discussed merely to enable those skilled in the art to better understand and implement the subject matter described herein, and are not intended to limit the scope, applicability, or examples set forth in the claims. The function and arrangement of the elements discussed may be changed without departing from the scope of the embodiments described herein. Various processes or components may be omitted, substituted, or added as needed in the various examples. Furthermore, features described in some examples may be combined in other examples.

[0015] As used herein, the term "comprising" and its variations are open terms meaning "including but not limited to". The term "based on" means "at least partially based on". The terms "one embodiment" and "an embodiment" mean "at least one embodiment". The term "another embodiment" means "at least one other embodiment". The terms "first", "second", etc., may refer to different or the same objects. Other definitions, whether explicit or implicit, may be included below. Unless explicitly indicated by the context, the definition of a term shall remain consistent throughout the specification.

[0016] The seawater circulating cooling system for chemical production according to embodiments of this specification will now be described in detail with reference to the accompanying drawings.

[0017] Figure 1 A schematic diagram of an example of a seawater circulating cooling system 100 for chemical production according to an embodiment of this specification is shown.

[0018] like Figure 1 As shown, the seawater circulation cooling system 100 may include a seawater intake device 110, a physical treatment device 120, a chemical treatment device 130, a makeup water tank 140, a cooling tower 150, a circulating water pump 160, a heat exchange system 170, a chemical plant cooling system 180, and a chemical plant 190 connected in sequence. In some examples, seawater can be introduced into the physical treatment device 120 using the seawater intake device 110. In the physical treatment device 120, the seawater from the seawater intake device can be physically treated to separate the seawater into precipitates and seawater clear liquid. Subsequently, at least a portion of the seawater clear liquid from the physical treatment device 120 can be electrolyzed in the chemical treatment device 130 using an electrolysis device to generate sodium hypochlorite, and the generated sodium hypochlorite is used to chemically treat the seawater clear liquid flowing to the makeup water tank 140 to obtain chemically treated seawater. The chemically treated seawater can be stored in the makeup water tank 140. When cooling tower 150 needs replenishment of circulating water, replenishment water tank 140 can provide chemically treated seawater as new replenishment circulating water to the cooling tower. Circulating water pump 160 can be used to transport the circulating water cooled by cooling tower 150 to heat exchange system 170. In heat exchange system 170, the circulating water cooled by cooling tower 150 can act as a cold fluid to absorb at least part of the heat transferred from chemical plant cooling system 180, thereby cooling the cooling medium of chemical plant cooling system 180. Furthermore, in chemical plant cooling system 180, the cooled cooling medium can be used to cool chemical plant 190.

[0019] In some examples, the seawater intake device 110 may include a water intake pump for drawing seawater. In some examples, the water intake pump may employ a high-efficiency motor and variable frequency speed control technology, thereby reducing energy consumption.

[0020] In some examples, the physical treatment device 120 can perform physical treatments such as filtration, coagulation, and sedimentation, primarily to remove impurities such as suspended solids, colloids, and organic matter from seawater to improve water quality. In some examples, the physical treatment device 120 may include a coarse filter, a fine filter, a coagulant dosing device, and a sedimentation tank. Thus, the physically treated seawater can be separated into sediment and clarified seawater.

[0021] In some examples, the physical treatment device 120 can first use a coarse filtration device to remove larger impurities from the seawater from the seawater intake device 110. Then, a flocculant (such as FeCl3) and a coagulant aid can be added to the coarsely filtered seawater through a coagulant dosing device, causing suspended particles and colloidal impurities in the water to attract each other and agglomerate into larger flocs, which gradually settle under gravity. Next, the liquid after coagulation can flow into a sedimentation tank, where the flocs can continue to settle, ultimately achieving solid-liquid separation. The supernatant in the sedimentation tank is the seawater clarified after coarse filtration, coagulation, and sedimentation, with significantly reduced turbidity and pollution index. In some examples, the aforementioned seawater clarified liquid can also continue to enter a fine filtration device, such as a multi-media filter or a V-type filter, to further remove fine suspended particles and impurities.

[0022] In some examples, in the chemical treatment unit 130, the seawater clarified solution obtained from the physical treatment unit 120 can be electrolyzed using an electrolysis device to generate sodium hypochlorite. In some examples, the electrolysis device can employ graphite electrodes, titanium-coated electrodes, etc., thereby improving electrolysis efficiency and sodium hypochlorite production while maintaining high catalytic activity and corrosion resistance. In some examples, the sodium hypochlorite solution generated by seawater electrolysis can be added to the seawater clarified solution flowing from the physical treatment unit 120 to the makeup water tank 140. In some examples, the sodium hypochlorite solution generated by seawater electrolysis can be used in the chemical treatment process of circulating cooling water in the cooling tower 150. Thus, seawater resources can be fully utilized by using the generated sodium hypochlorite, derived from seawater, for further purification of seawater to obtain circulating water.

[0023] In some examples, the chemical treatment apparatus 130 may further treat the seawater solution with chemicals such as disinfection, sterilization, pH adjustment, and removal of organic matter and microorganisms. In some examples, the chemical treatment apparatus 130 may also include a treatment agent dispensing device, wherein the dispensed treatment agent may include, for example, various chemical agents used for disinfection, sterilization, pH adjustment, scale inhibition, removal of organic matter and / or microorganisms.

[0024] In some examples, there may be multiple treatment agent dosing devices, and these devices may be located in different positions. In some examples, the chemical treatment device 130 can determine the current dosage of various treatment agents based on the current water quality of the seawater clarifier and control the metering pumps of the corresponding treatment agent dosing devices to administer the treatment agents according to the determined dosage. In some examples, the treatment agent dosing devices may include strong oxidant dosing devices, which can be used to administer strong oxidants such as NaClO, HClO, H2O2, and Cl2. In some examples, ultraviolet lamps may be placed near the hydrogen peroxide dosing device to enhance the effect of inhibiting microbial growth and reproduction by combining H2O2 and ultraviolet light, and to avoid the formation of disinfection byproducts. In some examples, multiple treatment agent dosing devices may include sodium hypochlorite dosing devices and sulfuric acid dosing devices, thereby achieving more efficient removal of microorganisms and organic matter from seawater through combined treatment. In some examples, the treatment agent dosing devices may also include scale inhibitor and dispersant dosing devices, which can be used to inhibit the scaling of calcium ions, magnesium ions, etc. In some examples, the treatment agent dispensing device may also include an algae inhibitor dispensing device, which can be used to inhibit microbial attachment.

[0025] In some examples, the replenishment pool 140 can be used to store chemically treated seawater obtained from the chemical treatment unit 130 and to supply water to the cooling tower 150 to replenish water lost due to evaporation, drift, sewage discharge and leakage, so as to maintain the normal operation of the cooling tower 150.

[0026] In some examples, circulating water can be supplied from the makeup water tank 140 to the cooling tower 150 according to the required replenishment volume. In some examples, the frame support structure, water collection tank, and tower cylinder of the cooling tower 150 can be constructed using reinforced concrete. In some examples, the reinforced concrete material can be a high-performance concrete (HPC) formulation with added steel corrosion inhibitors to improve corrosion resistance. In some examples, the surface of the cooling tower 150 can have a high-performance anti-corrosion protective coating, thereby improving weather resistance, acid and alkali salt resistance, aging resistance, waterproofing, and corrosion resistance.

[0027] In some examples, the seawater circulating cooling system 100 may also include connecting pipes. In some examples, the connecting pipes may include underground pipes laid underground and above-ground pipes erected in pipe racks. In some examples, the underground pipes may be large-diameter (e.g., over 1 meter) high-density polyethylene (HDPE) pipes. Due to the good flexibility of HDPE pipes, they can be easily laid along the terrain of the trench, easily avoiding obstacles during installation, and are more adaptable to soil settlement in soft soil areas, thus giving HDPE pipes a significant advantage in preventing settlement. Furthermore, the flexibility of HDPE pipes allows for moderate bending, providing good resistance to uneven settlement, further enhancing their effectiveness in preventing pipe settlement. In addition, HDPE pipelines have good corrosion resistance, thereby reducing the amount of corrosion inhibitors needed. In some examples, in key areas, HDPE steel-plastic composite pipes with better overall performance can also be used as connecting pipes.

[0028] In some examples, the heat exchange system 170 connected to the circulating water pump 160 may include a primary heat exchanger, and the chemical plant cooling system 180 may include a secondary heat exchanger. The cold fluid in the primary heat exchanger may be circulating water cooled by the cooling tower 150. The hot fluid in the primary heat exchanger may be the fluid that has absorbed heat through the heat exchange process in the secondary heat exchanger, i.e., the cold fluid after heat exchange.

[0029] In these examples, the secondary heat exchanger can absorb at least a portion of the heat from the cooling medium used to cool the chemical plant 190 through a heat exchange process. The primary heat exchanger can use circulating water as a cold fluid to cool the cooling medium that has undergone heat exchange in the secondary heat exchanger; that is, the cooling medium that has undergone heat exchange in the secondary heat exchanger can serve as the hot fluid in the primary heat exchanger.

[0030] Figure 2 A schematic diagram of yet another example of a seawater circulating cooling system 200 for chemical production, according to an embodiment of this specification, is shown.

[0031] like Figure 2 As shown, the seawater circulating cooling system 200 may include, in sequence, a seawater intake device 210, a physical treatment device 220, a chemical treatment device 230, a makeup water tank 240, a cooling tower 250, a circulating water pump 260, a heat exchange system 270, a chemical plant cooling system 280, and a chemical plant 290, as well as a desalination treatment device 242 connected to the makeup water tank 240. It should be noted that detailed descriptions of the seawater intake device 210, physical treatment device 220, chemical treatment device 230, makeup water tank 240, cooling tower 250, circulating water pump 260, heat exchange system 270, chemical plant cooling system 280, and chemical plant 290 can be found in the foregoing. Figure 1 The relevant descriptions in the embodiments will not be repeated here.

[0032] In this embodiment, the primary heat exchanger can be a titanium alloy plate heat exchanger. For primary heat exchangers that are in direct contact with seawater, titanium alloy can be used to improve corrosion resistance, while also possessing the characteristics of high strength and lightweight.

[0033] In some examples, the desalination unit 242 can desalinate chemically treated seawater obtained from the replenishment water tank 240 to obtain demineralized water. The obtained demineralized water can be used as a refrigerant to cool the chemical processing unit 290. The demineralized water after heat exchange can be used as the hot fluid in the secondary heat exchanger 280 to exchange heat with the cold fluid in the secondary heat exchanger 280. The cold fluid in the secondary heat exchanger 280, after absorbing heat, can then pass through the primary heat exchanger 270 to transfer heat to the circulating water cooled by the cooling tower.

[0034] In some examples, the desalination unit 242 may employ membrane separation technology to separate demineralized water and high-concentration brine. In some examples, the desalination unit 242 may further process the separated demineralized water through steps such as water quality reduction, pH adjustment, and scale inhibitor addition. The treated demineralized water is then used as the heat transfer fluid in the secondary heat exchanger 280 to cool the chemical plant 290. In some examples, the separated high-concentration brine can also be used as a chemical feedstock, and after further processing, can be used in the chemical plant.

[0035] By using desalinated water treated by a desalination plant as a cooling medium for chemical plants, corrosion of the plants can be reduced, thereby improving cooling efficiency while protecting the plants.

[0036] Figure 3 A schematic diagram of an example of a seawater intake device 300 according to an embodiment of this specification is shown.

[0037] like Figure 3 As shown, the seawater intake device 300 may include a seawater intake head 310, an intake pipe 320, a ball-passing system 330, and a backwashing system 340.

[0038] In some examples, a high-strength first filter screen can be installed outside the seawater intake head 310, which can effectively reduce large floating objects, protect downstream equipment (such as pumps) from the impact of foreign objects, and thus reduce the burden on further seawater treatment. In some examples, the pore size of the aforementioned high-strength first filter screen is adjustable, for example, the pore size can be adjusted according to different seasons, tidal conditions, marine biological growth, and debris conditions.

[0039] In some examples, the seawater intake head 310 may also include an adjustable wave deflector disposed outside the intake to prevent debris from entering or causing damage due to wave impact. In some examples, the aforementioned adjustable wave deflector may be disposed within a high-strength first filter screen.

[0040] In some examples, the main body of the seawater intake head 310 can be made of high-strength, low-density titanium alloy. In some examples, the seawater intake head 310 can be anodized or nickel-plated to enhance surface hardness, forming a dense protective layer to further resist seawater erosion. In some examples, the surface of the seawater intake head 310 can have microscopic or nanoscale dynamic textures to simulate the irregular surface structure of certain marine organisms, such as shark skin, thereby reducing the likelihood of biofouling. In some examples, blades or water flow guide plates can be installed around the seawater intake head 310, which can reduce the stability of biofouling by changing the local water flow direction, further reducing biofouling and being environmentally friendly and pollution-free.

[0041] One end of the water intake pipe 320 can be connected to the seawater intake head 310. In some examples, the other end of the water intake pipe 320 can be connected to a water intake structure, such as an intake chamber. In some examples, a second filter screen can be installed at the port of the water intake pipe 320.

[0042] In some examples, the water intake pipe may also be equipped with spiral guide vanes, and the surface of the guide vanes is coated with a nano-ceramic coating. The nano-ceramic coating improves wear resistance and corrosion resistance, while the guide vanes improve the flow state of the water and reduce the impact of the water flow on the pipe wall, thereby reducing pipe vibration and noise. Furthermore, by correcting the wave direction, it can prevent the formation of Karman vortices, thereby reducing vortex generation and preventing vortex-induced vibration of the pipeline in the sea.

[0043] The pigging system 330 can be used to clean the water intake pipe 320. In some examples, the pigging system 330 may include a launching tube, a collecting tube, and a pig respectively installed at both ends of the water intake pipe 320. The pigging system 330 can be used to clean the accumulated dirt and impurities in the water intake pipe 320, ensuring the normal operation of the pipeline system, thereby significantly reducing the manpower and material resources required for manual cleaning of the pipeline at sea.

[0044] The backwashing system 340 can be used to rinse the first filter and / or the second filter. In some examples, the backwashing system 340 can use high-pressure gas (e.g., air at 4-7 bar) to rinse the first filter and / or the second filter to remove surface deposits. In some examples, the backwashing system 340 can use an ultrasonic generator located near the first filter and / or the second filter to emit ultrasonic waves. Utilizing the cavitation effect generated by the ultrasonic waves, a powerful cleaning force is produced through the collapse of microbubbles, thereby effectively removing dirt and impurities from the first filter and / or the second filter. This method can efficiently and environmentally clean the first filter and / or the second filter, while also disrupting biological structures, thereby effectively repelling or killing attached organisms.

[0045] In some examples, the backwashing system 340 can select between high-pressure gas or ultrasonic cleaning based on feedback from relevant sensors. For instance, if the relevant sensors indicate that the first and / or second filters are lightly or moderately dirty, or indicate a large or moderate water intake, the backwashing system 340 can choose to use high-pressure gas for cleaning. Conversely, if the relevant sensors indicate that the first and / or second filters are heavily dirty, or indicate a small water intake, the backwashing system 340 can choose to use ultrasonic cleaning. In some examples, water quality can be assessed in real time based on multiple parameters detected by relevant sensors, such as conductivity, turbidity, and biological activity, and the flushing frequency and intensity can be automatically adjusted to prevent sediment accumulation. In some examples, the relevant sensors can also monitor the activity of nearby marine life in real time. If a trend of large-scale marine life aggregation is detected, the backwashing system 340 can be triggered to clean the first and / or second filters while reducing and preventing the attachment of large amounts of organisms.

[0046] Figure 4 A schematic diagram of an example of a ball-passing system 400 according to an embodiment of this specification is shown.

[0047] like Figure 4 As shown, the pigging system 400 may include an intelligent pigging ball 410, a pigging ball receiving and dispatching device 420, a pigging control device 430, and a pigging ball storage device 440.

[0048] In this embodiment, the intelligent pipeline cleaning ball 410 can be a small, mobile robot equipped with sensors, a wireless communication module, and an actuator. The intelligent pipeline cleaning ball 410 can send information collected by the sensors to the ball control device 430 via the wireless communication module, and receive the first control command sent by the ball control device 430. Then, the actuator performs operations such as movement, detection, cleaning, and repair according to the received first control command.

[0049] In this embodiment, the pigging ball receiving and dispatching device 420 can be disposed at both ends of the water intake pipeline. In some examples, the pigging ball receiving and dispatching device 420 can be configured to perform a pigging ball receiving operation or a pigging ball dispatching operation according to a second control command sent by the pigging control device 430. In some examples, each pigging ball receiving and dispatching device 420 has the capability to perform both pigging ball receiving and dispatching operations. In some examples, the pigging ball receiving and dispatching device 420 can be further configured to send the received smart pigging ball 410 into the pigging ball receiving device 440 in response to the completion of the pigging ball receiving operation. In some examples, the pigging ball receiving and dispatching device 420 can be further configured to retrieve the smart pigging ball 410 from the pigging ball receiving device 440 and perform the pigging ball dispatching operation in response to receiving a second control command indicating a pigging ball dispatching operation.

[0050] In this embodiment, the pigging control device 430 can generate a first control command for the intelligent pigging ball 410 based on the information received from the intelligent pigging ball 410, and send the first control command to the intelligent pigging ball 410. In some examples, the pigging control device 430 can send a second control command to the pigging ball transceiver device 420, instructing the execution of a pigging ball receiving operation or a pigging ball sending operation. In some examples, the second control command instructing the pigging ball sending operation can be sent periodically, or can be triggered in response to receiving a start pigging cleaning command sent by a user terminal or central control system, or can be triggered in response to a water flow rate less than a threshold or a sludge or other debris amount greater than a threshold indicated by a sensor arranged in the pipeline. In some examples, the second control command instructing the pigging ball receiving operation can be triggered in response to the intelligent pigging ball 410 approaching another port of the water intake pipeline (meaning that the pipeline cleaning task is about to be completed).

[0051] In this embodiment, the pig collection device 440 can be configured to collect the received intelligent pig 410 that has completed its pipeline cleaning task. In some examples, the pig collection device 440 can be located near the pig receiving and dispatching device 420. In some examples, the pig collection device 440 can be integrated into the pig receiving and dispatching device 420.

[0052] The above methods provide a technical basis for the bidirectional movement and storage of pipeline cleaning pigs, making it easier to perform pipeline cleaning tasks more efficiently.

[0053] Figure 5 A schematic diagram of yet another example of a seawater circulating cooling system 500 for chemical production, according to an embodiment of this specification, is shown.

[0054] like Figure 5As shown, the seawater circulating cooling system 500 may include, in sequence, a seawater intake device 510, a physical treatment device 520, a chemical treatment device 530, a makeup water tank 540, a cooling tower 550, a circulating water pump 560, a heat exchange system 570, a chemical plant cooling system 580, and a chemical plant 590. It should be noted that detailed descriptions of the seawater intake device 510, physical treatment device 520, chemical treatment device 530, makeup water tank 540, cooling tower 550, circulating water pump 560, heat exchange system 570, chemical plant cooling system 580, and chemical plant 590 can be found in the foregoing. Figures 1-4 The relevant descriptions in the embodiments will not be repeated here.

[0055] The chemical treatment unit 530 may further include a treatment agent dosing device for the combined dosing of sulfuric acid and the generated sodium hypochlorite to chemically treat the seawater effluent flowing into the replenishment pool. By employing the combined treatment of sodium hypochlorite and sulfuric acid, the reaction between sodium hypochlorite and sulfuric acid generates hydrogen chloride (HCl) and sulfate ions (SO42-). 2- It may also contain some hydrosulfite ions (HSO4). - At the same time, sodium hypochlorite further decomposes into hypochlorous acid (HClO) and other products, which can more effectively kill bacteria, viruses and other microorganisms.

[0056] In some examples, the treatment agent dosing device can dynamically adjust the amount of sulfuric acid added and the amount of sodium hypochlorite generated based on the current water quality, thereby ensuring water quality while avoiding waste of agents or pH imbalance.

[0057] In some examples, the chemical treatment apparatus 530 may further include an electrolysis water temperature regulating device for controlling at least a portion of the circulating water flowing from the heat exchange system 570 to the cooling tower 550 to be diverted to the electrolysis apparatus when the temperature of the electrolyzed seawater meets a preset requirement. In some examples, when the temperature of the electrolyzed seawater meets the preset requirement, the water temperature regulating device may control the opening and closing of corresponding connecting valves to draw at least a portion of the circulating water flowing from the heat exchange system 570 to the cooling tower 550 to the electrolysis apparatus. In some examples, the water temperature regulating device may control the opening of corresponding connecting valves and transfer the heat of the drawn-out circulating water to the electrolyzed seawater through the heat exchange device, thereby increasing the temperature of the electrolyzed seawater. Simultaneously, it also lowers the temperature of the introduced circulating water, which is equivalent to reducing the heat load on the cooling tower to some extent. In some examples, the opening and closing of corresponding connecting valves may also be directly controlled to inject the drawn-out circulating water into the electrolysis tank, thereby increasing the temperature of the electrolyzed seawater.

[0058] In some examples, the aforementioned preset requirement may be below a preset threshold (e.g., 10°C). In some examples, the aforementioned preset requirement may be no higher than a preset threshold (e.g., 80°C). Since the electrolysis of seawater to produce sodium hypochlorite typically requires the temperature of the seawater to be electrolyzed to be no lower than a specified value (e.g., 10°C), and higher temperatures result in higher electrolysis efficiency, the above scheme can effectively utilize the heat of the circulating water flowing from the heat exchange system 570 to the cooling tower 550, improve heat utilization, reduce the heat load on the cooling tower 550, and achieve energy conservation and emission reduction.

[0059] Figure 6 A schematic diagram of an example of a chemical processing apparatus 600 according to an embodiment of this specification is shown.

[0060] like Figure 6 As shown, the chemical processing apparatus 600 may include an oxidant storage device 610, a processing agent dispensing device 620, and a hydrogen separation device 630.

[0061] The oxidant storage device 610 can be used to store sodium hypochlorite generated by the electrolysis device.

[0062] The treatment agent dosing device 620 can be used to chemically treat seawater from the physical treatment device by jointly adding sulfuric acid and the generated sodium hypochlorite.

[0063] The hydrogen separation device 630 can be used to separate hydrogen generated at the cathode of an electrolysis unit and transfer it to a target device. In some examples, hydrogen can be separated by physical methods such as pressurization and cooling or membrane separation, or by chemical methods such as using sodium sulfide solution to remove chlorine and ultimately separate hydrogen. In some examples, the separated hydrogen can be further processed to improve its purity. In some examples, the target device can be a hydrogen storage device. In some examples, the target device can be a chemical plant that uses hydrogen.

[0064] Using the above method, while obtaining sodium hypochlorite as an oxidant through the electrolysis of seawater, hydrogen gas, an important raw material in chemical production, can be generated and collected. For example, it can be used in the production of synthetic ammonia, methanol, and hydrogenation reactions in petroleum refining processes, making full use of the reaction products and saving energy.

[0065] It should be understood that Figures 1-6 All entities shown are exemplary, and any other entities may be involved in a seawater circulating cooling system for chemical production, depending on the specific application requirements.

[0066] Reference above Figures 1 to 6 An embodiment of a seawater circulating cooling system for chemical production, according to embodiments of this specification, has been described. Utilizing Figures 1-6The disclosed seawater circulation cooling system for chemical production sequentially processes seawater through a seawater intake device, a physical treatment device, and a chemical treatment device. The treated seawater is then stored in a replenishment water tank, which supplies circulating water to the cooling tower. The circulating water, cooled by the cooling tower, is then pumped by a circulating water pump to act as the cold fluid in the heat exchange system, cooling the chemical plant's cooling system. Thus, this seawater circulation, two-stage cooling mechanism reduces water waste and helps ensure the normal operation of the chemical plant.

[0067] Embodiments of this disclosure provide a seawater circulating cooling system for chemical production. The seawater circulating cooling system for chemical production may include: a seawater intake device, a physical treatment device, a chemical treatment device, a makeup water tank, a cooling tower, a circulating water pump, a heat exchange system, a chemical plant cooling system, and a chemical plant, connected in sequence; the physical treatment device is used to physically treat the seawater from the seawater intake device, separating the seawater into precipitates and seawater clear liquid; the chemical treatment device is used to electrolyze the seawater clear liquid using an electrolysis device to generate sodium hypochlorite, and to use the generated sodium hypochlorite to chemically treat the seawater clear liquid flowing to the makeup water tank; the makeup water tank is used to store the chemically treated seawater and to supply circulating water to the cooling tower; the cooling tower is used to cool the circulating water transported by the circulating water pump; the heat exchange system uses the circulating water as a cold fluid to exchange heat with the chemical plant cooling system; and the chemical plant cooling system is used to cool the chemical plant.

[0068] In one implementation, the heat exchange system connected to the circulating water pump includes a primary heat exchanger, and the chemical plant cooling system includes a secondary heat exchanger. The cold fluid in the primary heat exchanger is the circulating water, and the hot fluid in the primary heat exchanger is the fluid that has exchanged heat with the chemical plant in the secondary heat exchanger.

[0069] In one implementation, the seawater circulating cooling system further includes a desalination treatment device connected to the replenishment water pool, the primary heat exchanger includes a titanium alloy plate heat exchanger, and the hot fluid of the primary heat exchanger includes demineralized water treated by the desalination treatment device.

[0070] In one implementation, the seawater intake device includes: a seawater intake head, with a high-strength first filter screen disposed on the outside of the seawater intake head; a water intake pipe connected to the seawater intake head, with a second filter screen disposed at the port of the water intake pipe; a ball-passing system for cleaning the water intake pipe; and a backwashing system for rinsing the first filter screen and / or the second filter screen.

[0071] In one implementation, the seawater intake head further includes an adjustable wave deflector disposed outside the intake port, and a spiral guide vane is disposed inside the intake pipe, with the surface of the guide vane coated with a nano-ceramic coating.

[0072] In one implementation, the pigging system includes: an intelligent pigging ball, comprising sensors, a wireless communication module, and an actuator; the intelligent pigging ball is configured to send information collected by the sensors to a pigging control device via the wireless communication module and to receive a first control command sent by the pigging control device, and to perform corresponding operations according to the first control command via the actuator; a pigging ball transceiver device, configured to perform a pigging ball receiving operation or a pigging ball sending operation according to a second control command received from the pigging control device; the pigging control device, configured to send the first control command and / or the second control command to the intelligent pigging ball and / or the pigging ball transceiver device; and a pigging ball storage device for storing the intelligent pigging ball.

[0073] In one implementation, the pigging ball receiving and sending device is further configured to: in response to the completion of the pigging ball receiving operation, send the received smart pigging ball into the pigging ball storage device; and in response to receiving a second control command for instructing the pigging ball sending operation, retrieve the smart pigging ball from the pigging ball storage device and execute the pigging ball sending operation.

[0074] In one implementation, the chemical treatment apparatus further includes a treatment agent dispensing device for jointly dispensing sulfuric acid and the generated sodium hypochlorite to chemically treat the seawater clear liquid flowing into the replenishment pool.

[0075] In one implementation, the chemical treatment apparatus further includes an electrolytic water temperature control device for controlling at least a portion of the circulating water flowing from the heat exchange system to the cooling tower to be directed to the electrolysis apparatus when the temperature of the electrolyzed seawater solution meets a preset requirement.

[0076] In one implementation, the chemical processing apparatus includes: an oxidant storage device for storing the generated sodium hypochlorite; and a hydrogen separation device for separating the hydrogen generated at the cathode and transferring it to the target device.

[0077] The foregoing describes specific embodiments of this specification. Other embodiments are within the scope of the appended claims. Not all units in the above structural diagrams are necessary; some units may be omitted as needed. The structures described in the above embodiments can be physical or logical structures; that is, some units may be implemented by the same physical entity, or some units may be implemented by multiple physical entities, or they may be jointly implemented by certain components in multiple independent devices.

[0078] The term "exemplary" as used throughout this specification means "serving as an example, instance, or illustration" and does not imply that it is "preferred" or "advantageous" over other embodiments. Detailed descriptions are included for the purpose of providing an understanding of the described techniques. However, these techniques may be practiced without these detailed descriptions. In some instances, well-known structures and apparatuses are shown in block diagram form to avoid obscuring the concepts of the described embodiments.

[0079] The optional embodiments of the present specification have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present specification are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present specification, various simple modifications can be made to the technical solutions of the embodiments of the present specification, and these simple modifications all fall within the protection scope of the embodiments of the present specification.

[0080] The foregoing description of this specification is provided to enable any person skilled in the art to implement or use the content of this specification. Various modifications to the content of this specification will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the scope of protection of this specification. Therefore, this specification is not limited to the examples and designs described herein, but is consistent with the widest scope of the principles and novel features disclosed herein.

Claims

1. A seawater circulating cooling system for chemical production, characterized in that, include: The system consists of a seawater intake device, a physical treatment device, a chemical treatment device, a water supply tank, a cooling tower, a circulating water pump, a heat exchange system, a chemical plant cooling system, and a chemical plant, connected in sequence. The physical processing device is used to physically process the seawater from the seawater intake device, separating the seawater into precipitate and seawater clear liquid. The chemical treatment device is used to electrolyze the seawater solution to generate sodium hypochlorite using an electrolysis device, and to use the generated sodium hypochlorite to chemically treat the seawater solution flowing to the replenishment pool. The replenishment water tank is used to store chemically treated seawater and replenish circulating water to the cooling tower. The cooling tower is used to cool the circulating water delivered by the circulating water pump; The heat exchange system utilizes the circulating water, as a cold fluid, to exchange heat with the cooling system of the chemical plant; and The cooling system of the chemical plant is used to cool the chemical plant.

2. The seawater circulating cooling system as described in claim 1, characterized in that, The heat exchange system connected to the circulating water pump includes a primary heat exchanger, and the chemical plant cooling system includes a secondary heat exchanger. The hot fluid in the primary heat exchanger is the fluid that has exchanged heat with the chemical plant in the secondary heat exchanger.

3. The seawater circulating cooling system as described in claim 2, characterized in that, The seawater circulation cooling system also includes a desalination treatment device connected to the replenishment water pool. The primary heat exchanger includes a titanium alloy plate heat exchanger, and the hot fluid in the secondary heat exchanger includes demineralized water treated by the desalination device.

4. The seawater circulating cooling system as described in claim 1, characterized in that, The seawater intake device includes: A seawater intake head, wherein a high-strength first filter screen is installed on the outside of the seawater intake head; A water intake pipe is connected to the seawater intake head, and a second filter screen is provided at the port of the water intake pipe; A ball-passing system is used to clean the water intake pipe; and A backwashing system for rinsing the first filter screen and / or the second filter screen.

5. The seawater circulating cooling system as described in claim 4, characterized in that, The seawater intake head also includes an adjustable wave deflector installed outside the intake. The water intake pipe is equipped with a spiral guide vane inside, and the surface of the guide vane is coated with a nano-ceramic coating.

6. The seawater circulating cooling system as described in claim 4, characterized in that, The ball-passing system includes: The intelligent pigging ball includes sensors, a wireless communication module, and an actuator. The intelligent pigging ball is configured to send information collected by the sensors to a pigging control device via the wireless communication module and receive a first control command sent by the pigging control device, and to perform corresponding operations according to the first control command via the actuator. The pigging and dispatching device is configured to perform a pigging and dispatching operation according to a second control command sent by the pigging control device. The pig control device is configured to send the first control command and / or the second control command to the intelligent pig and / or the pig transceiver; and A pigging ball storage device is used to store the intelligent pigging ball.

7. The seawater circulating cooling system as described in claim 6, characterized in that, The pigging launcher / receiver is further configured as follows: In response to the completion of the pig receiving operation, the received smart pig is sent into the pig storage device; In response to receiving a second control command instructing the pig delivery operation, the smart pig is retrieved from the pig storage device and the pig delivery operation is executed.

8. The seawater circulation cooling system as described in any one of claims 1 to 7, characterized in that, The chemical treatment device also includes a treatment agent dosing device for jointly dosing sulfuric acid and the generated sodium hypochlorite to chemically treat the seawater clear liquid flowing into the replenishment pool.

9. The seawater circulating cooling system as described in claim 8, characterized in that, The chemical treatment device also includes an electrolytic water temperature control device, which controls at least a portion of the circulating water flowing from the heat exchange system to the cooling tower to be directed to the electrolysis device when the temperature of the electrolyzed seawater solution meets the preset requirements.

10. The seawater circulating cooling system as described in claim 9, characterized in that, The chemical processing apparatus includes: Oxidizing agent storage device for storing the generated sodium hypochlorite; and A hydrogen separation device is used to separate the hydrogen generated at the cathode and transfer it to the target equipment.

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