Variable frequency control fresh water supply system for offshore platform

Abstract

The utility model discloses an offshore platform variable frequency control fresh water supply system, including fresh water cabin, bottom plate, the outer wall of bottom plate one side is installed with three fresh water pumps through bolt, and three fresh water pump water inlet is installed with the water inlet pipeline through flange, three fresh water pump water outlet is installed with water supply pipeline no.

Description

Technical Field

[0001] This utility model relates to the field of freshwater supply technology for offshore platforms, specifically to a frequency conversion control freshwater supply system for offshore platforms. Background Technology

[0002] To ensure the water needs of personnel on offshore platforms for production and daily life, all offshore platforms are equipped with freshwater supply systems. In addition to providing drinking water for personnel, these systems also supply freshwater for equipment cooling, laboratories, work areas, eyewash stations, fire protection systems, chemical injection systems, and equipment and facility flushing. Typically, cold water for domestic use on offshore platforms is supplied by pressurized water tanks; hot water is generally supplied by electric heating tube tanks. The freshwater pumps and hot water circulation pumps in these systems are generally controlled by industrial frequency.

[0003] For example, a hot water supply system for a living quarters on an offshore platform, with application number CN202320485321.X and authorization announcement date of 20230915, includes a pressure tank. The output pipe of the pressure tank is divided into a supply water pipe and a cold water pipe via a T-junction. The supply water pipe is further divided into an A1 supply water pipe and a B1 supply water pipe via a T-junction. Both the A1 and B1 supply water pipes are interconnected with the hot water pipe. This utility model includes an A1 supply water pipe, a C1 pressure control valve, and a hot water circulation pump. During peak water usage, the internal pressure drops due to the reduced return water volume in the return pipeline. When the pressure drops to the preset value of the C1 pressure control valve, the C1 pressure control valve opens, replenishing fresh water to the hot water circulation pump through the A1 supply water pipe. This ensures stable pressure in the hot water circulation system and solves the problem of insufficient hot water volume and pressure during peak water usage periods, which prevents high-rise residents from using hot water smoothly.

[0004] The aforementioned freshwater supply systems, as well as those in the existing technology, have large footprints, high investment costs, high failure rates, large pipeline impact loads, low levels of intelligence, low efficiency, and low energy-saving effects. Therefore, there is an urgent need to design a frequency conversion control freshwater supply system for offshore platforms to solve these problems. Utility Model Content

[0005] The purpose of this invention is to provide a frequency conversion control freshwater supply system for offshore platforms to address the aforementioned shortcomings in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A frequency conversion controlled freshwater supply system for an offshore platform includes a freshwater tank and a bottom plate. Three freshwater pumps are bolted to one side of the outer wall of the bottom plate, and inlet pipes are connected to the inlets of the three pumps via flanges. A first water supply pipe is connected to the outlets of the three pumps via flanges, with one end of the inlet pipe extending into the freshwater tank. A freshwater tank is bolted to one side of the outer wall of the bottom plate, with one end of the first water supply pipe extending into the freshwater tank. A second water supply pipe is connected to one side of the outer wall of the freshwater tank via flanges. A production water module, a first filter, and a second filter are bolted to one side of the outer wall of the bottom plate. The three ends of the second water supply pipe extend to the freshwater tank, the first filter, and the second filter, respectively. A third water supply pipe is connected between the first and second filters via flanges. A fourth water supply pipe is connected between the first and second filters via flanges. The bottom plate... Two sterilizers are bolted to the outer side wall. The two ends of the water supply pipe four extend into the two sterilizers respectively. A water supply pipe five is installed between the two sterilizers via a flange. A domestic water module and a hot water tank are bolted to the outer side wall of the base plate. The two ends of the water supply pipe five are connected to the domestic water module and the hot water tank respectively. A water supply pipe six is ​​bolted to the outer side wall of the hot water tank. Two circulation pumps are bolted to the outer side wall of the base plate. Two water supply pipes seven are installed between the inlets of the two circulation pumps and the hot water tank. A water supply pipe eight is installed at the outlets of the two circulation pumps via flanges. Two electromagnetic heating furnaces are bolted to the outer side wall of the base plate. The two ends of the water supply pipe eight are connected to the two electromagnetic heating furnaces respectively. A water supply pipe is installed at the outlets of the two electromagnetic heating furnaces via flanges.

[0008] Furthermore, a housing is bolted to one side of the top of the base plate, and an integrated frequency converter control box is bolted to the same side of the top of the base plate. The integrated frequency converter control box is connected to the freshwater pump, water supply pipeline one, and freshwater tank via wires. The integrated frequency converter control box includes frequency converters, PLC controllers, and control panels for the freshwater pump and freshwater tank; dechlorination control units for filters one, two, two, and three; an online residual chlorine monitor and residual chlorine sensor; a disinfection control unit for the sterilizer and five-function water supply pipeline; frequency converters, PLC controllers, and control panels for the hot water tank and circulating pump; and a control panel, frequency converter, and two frequency converters for the electromagnetic heating furnace and water supply pipeline.

[0009] Furthermore, the freshwater tank is equipped with a pressure sensor and a flow monitor. The inlet pipe, three freshwater pumps, water delivery pipe, and freshwater tank, together with the corresponding frequency converter, PLC controller, control panel, pressure sensor, and flow monitor, constitute a freshwater pressure system.

[0010] Furthermore, the filters I and II are equipped with backwashing mechanisms and sewage discharge mechanisms. The filters I, II, water supply pipeline II, and water supply pipeline III, together with the backwashing mechanism, sewage discharge mechanism, dechlorination control unit, online residual chlorine monitor, and residual chlorine sensor, can constitute a dechlorination filtration system.

[0011] Furthermore, the sterilizer is equipped with an ultraviolet sensor and an electronic flow switch. The sterilizer, together with the corresponding disinfection control unit, ultraviolet sensor, and electronic flow switch, can form an ultraviolet disinfection system.

[0012] Furthermore, the hot water tank is equipped with a float level switch, a temperature sensor, and a thermometer. The hot water tank, water supply pipeline seven, circulation pump, and water supply pipeline eight, together with the corresponding float level switch, temperature sensor, thermometer, frequency converter, PLC controller, and control panel, can form a hot water storage and circulation system.

[0013] Furthermore, the electromagnetic heating furnace, water supply pipeline, and corresponding control panel, frequency converter, and two frequency converters can constitute an electromagnetic heating and water supply system.

[0014] In the above technical solution, the variable frequency control freshwater supply system for offshore platforms provided by this utility model has the following beneficial effects:

[0015] (1) This utility model adopts full-process automated control to realize constant pressure water supply, water purification and hot water circulation of the system. The key equipment is used in one and on standby, and automatically switches when there is a fault to ensure uninterrupted water supply. It adopts intelligent monitoring and early warning to reduce manual maintenance costs. It adopts frequency conversion technology to save energy and reduce consumption, and extend the equipment life.

[0016] (2) This utility model solves the problems of low efficiency, high energy consumption and difficult maintenance of traditional systems by using frequency conversion control, modular integration and intelligent monitoring technology, and significantly improves the reliability, economy and safety of freshwater supply on offshore platforms.

[0017] (3) The water supply pipelines of this utility model are designed in stages from one to eight, combined with variable frequency soft start technology to avoid water hammer effect, extend the service life of pipelines and equipment, and the dual redundancy configuration of sterilizer, circulating pump, electromagnetic heating furnace, etc. can ensure continuous operation of the system when a single equipment fails, thus reducing the failure rate. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a frequency conversion control freshwater supply system for offshore platforms according to this utility model.

[0020] Figure 2 This is a schematic diagram of the base plate and integrated frequency converter control box structure provided for an embodiment of a frequency converter-controlled freshwater supply system for offshore platforms according to this utility model.

[0021] Figure 3 This is a control flowchart provided for an embodiment of a frequency conversion control freshwater supply system for an offshore platform according to the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Freshwater tank; 2. Base plate; 3. Shell; 4. Integrated frequency converter control box; 5. Inlet water pipeline; 6. Freshwater pump; 7. Water supply pipeline one; 8. Freshwater tank; 9. Water supply pipeline two; 10. Production water module; 11. Filter one; 12. Filter two; 13. Water supply pipeline three; 14. Water supply pipeline four; 15. Sterilizer; 16. Water supply pipeline five; 17. Domestic water module; 18. Hot water tank; 19. Water supply pipeline six; 20. Water supply pipeline seven; 21. Circulation pump; 22. Water supply pipeline eight; 23. Electromagnetic heating furnace; 24. Water supply pipeline. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0025] like Figure 1-3As shown in the figure, an embodiment of the present invention provides a frequency conversion control freshwater supply system for an offshore platform, comprising a freshwater tank 1 and a bottom plate 2. Three freshwater pumps 6 are bolted to one side of the outer wall of the bottom plate 2, and the inlets of the three freshwater pumps 6 are connected to inlet pipes 5 via flanges. The outlets of the three freshwater pumps 6 are connected to a first water supply pipe 7 via flanges. One end of the inlet pipe 5 extends into the interior of the freshwater tank 1. A freshwater tank 8 is bolted to one side of the outer wall of the bottom plate 2, and one end of the first water supply pipe 7 extends into the interior of the freshwater tank 8. A second water supply pipe 9 is connected to one side of the outer wall of the freshwater tank 8 via flanges. A production water module 10, a first filter 11, and a second filter 12 are bolted to one side of the outer wall of the bottom plate 2. The three ends of the second water supply pipe 9 extend to the freshwater tank 8, the first filter 11, and the second filter 12, respectively. A third water supply pipe 13 is connected between the first filter 11 and the second filter 12 via flanges. A fourth water supply pipe 14 is connected between the first filter 11 and the second filter 12 via flanges. Two sterilizers 15 are bolted to one side of the outer wall of the base plate 2. The two ends of the water supply pipe 14 extend into the two sterilizers 15 respectively. A water supply pipe 16 is installed between the two sterilizers 15 through a flange. A domestic water module 17 and a hot water tank 18 are bolted to one side of the outer wall of the base plate 2. The two ends of the water supply pipe 16 are connected to the domestic water module 17 and the hot water tank 18 respectively. A water supply pipe 19 is bolted to one side of the outer wall of the hot water tank 18. Two circulation pumps 21 are bolted to one side of the outer wall of the base plate 2. Two water supply pipes 20 are installed between the inlet of the two circulation pumps 21 and the hot water tank 18. A water supply pipe 22 is installed between the outlet of the two circulation pumps 21 through a flange. Two electromagnetic heaters 23 are bolted to one side of the outer wall of the base plate 2. The two ends of the water supply pipe 22 are connected to the two electromagnetic heaters 23 respectively. A water supply pipe 24 is installed between the outlet of the two electromagnetic heaters 23 through a flange.

[0026] Specifically, in this embodiment, the system includes a freshwater tank 1 and a bottom plate 2. Three freshwater pumps 6 are bolted to the outer wall of one side of the bottom plate 2. All three pumps 6 are centrifugal pumps, forming a freshwater pump group 6. The inlets of the three pumps 6 are connected to inlet pipes 5 via flanges, and the outlets are connected to water supply pipes 7 via flanges. One end of the inlet pipes 5 extends into the freshwater tank 1. A freshwater tank 8, which serves as a buffer tank, is bolted to the outer wall of one side of the bottom plate 2. The buffer tank is responsible for... The system is responsible for storing and buffering the freshwater supplied by freshwater pump 6. A safety valve is installed at the top to prevent damage from system overpressure; a drain valve is installed at the bottom for automatic drainage. One end of water supply pipeline 7 extends into the interior of freshwater tank 8. Water supply pipeline 9 is installed on one side of the outer wall of freshwater tank 8 via a flange. Production water module 10, filter 11, and filter 12 are bolted to one side of the outer wall of the base plate 2. The three ends of water supply pipeline 9 extend to freshwater tank 8, filter 11, and filter 12, respectively. The second filter (12), filter one (11), and filter two (12) are made of stainless steel and have multiple layers of activated carbon filter media installed inside to adsorb chlorine molecules and other impurities in the water. The control unit uses time control to control the chlorination removal filter to discharge, switch, and backwash, thereby achieving regular discharge, switching, and backwashing of the chlorination removal filter to ensure the chlorination removal and filtration effect of the device. The residual chlorine detector monitors and displays the residual chlorine content in the water in real time. When the chlorine content in the water exceeds the standard, the detector will sound an alarm. Water supply pipe three (13) is installed between filter one (11) and filter two (12) through a flange, and water supply pipe four (14) is installed between filter one (11) and filter two (12) through a flange. Two sterilizers (15) are bolted to the outer wall of one side of the base plate 2. The sterilizer 15 is equipped with an ultraviolet lamp group, a reflector, a quartz sleeve, and a water flow channel. The electronic flow switch is installed on the water inlet pipe of the ultraviolet sterilizer by external thread connection. The electrical interface of the flow switch is connected to the controller. When the electronic flow switch detects that the water flow in the pipeline has reached the preset value, the controller will automatically control the ultraviolet sterilizer to work, which is used to kill various microorganisms in the water; when the electronic flow switch detects that the water flow in the pipeline has not reached the preset value, the controller will automatically control the ultraviolet sterilizer to stop working. The ultraviolet sensor is installed in the ultraviolet sterilizer with external threads, which monitors the irradiation intensity of the ultraviolet lamp group in real time, converts the light intensity signal into an electrical signal, and transmits it to the control system.When the ultraviolet sterilizer malfunctions, such as lamp damage, sensor failure, or control system abnormality, the system will immediately issue an alarm signal. The two ends of the water supply pipe 14 extend into the two sterilizers 15 respectively. A water supply pipe 16 is installed between the two sterilizers 15 via a flange. A domestic water module 17 and a hot water tank 18 are bolted to one side of the outer wall of the base plate 2. The hot water tank 18 is made of stainless steel and has an external insulation layer to maintain the temperature of the hot water inside. A safety valve is installed at the top to prevent damage from system overpressure, and a drain valve is installed at the bottom for automatic drainage. An internal flange-type magnetic float level switch is also installed. The electrical interface is connected to the PLC controller of the hot water circulation device and the frequency converter control unit of the electromagnetic heating device. When the liquid level in the hot water tank 18 is too low, the PLC controller of the hot water circulation device and the frequency converter control unit of the electromagnetic heating device respectively instruct the hot water circulation pump 21 and the electromagnetic heating furnace 23 to stop running to prevent equipment damage. At the same time, a buzzer alarm is sounded to remind the staff to troubleshoot the fault. When the liquid level in the hot water tank 18 reaches a high level, the PLC controller of the fresh water pressure system connected to the liquid level monitoring system will automatically control the fresh water pump 6 to stop running and sound an alarm. The two ends of the water supply pipeline 16 are respectively connected to the domestic water module 17 and the hot water tank 18. 8 are connected together. A water supply pipe 19 is bolted to one side of the outer wall of the hot water tank 18. Two circulation pumps 21 are bolted to one side of the outer wall of the base plate 2. The operation and stop of the circulation pumps 21 are controlled by a frequency converter control unit. The frequency converter control unit compares the hot water temperature signal monitored by the temperature sensor with the system's set target temperature, and uses a PID algorithm to instruct the frequency converter to change the output frequency, adjusting the speed of the hot water circulation pump 21 motor to increase or decrease the flow rate of hot water from the circulation pump 21 into the electromagnetic heater 23, ensuring a constant hot water temperature. Two water supply pipes 20 are installed between the inlets of the two circulation pumps 21 and the hot water tank 18. Two circulating pumps 21 have water supply pipes 22 installed at their outlets via flanges. Two electromagnetic heaters 23 are bolted to the outer wall of one side of the base plate 2. The frequency converter control unit compares the temperature signal monitored by the temperature sensor with the system's set target temperature and controls the frequency converter to work through PID algorithm instructions, adjusting the power frequency and output power of the electromagnetic heaters 23 to achieve precise control of the electromagnetic heaters 23 and the hot water temperature. The drain valve is used for automatic drainage. The two ends of the water supply pipe 22 are connected to the two electromagnetic heaters 23 respectively. The outlets of the two electromagnetic heaters 23 are connected to water supply pipes 24 via flanges.

[0027] This utility model provides a frequency conversion control freshwater supply system for offshore platforms. It adopts full-process automated control to achieve constant pressure water supply, water purification, and hot water circulation. Key equipment is used in pairs with one backup, and automatic switching occurs in case of failure to ensure uninterrupted water supply. It also adopts intelligent monitoring and early warning to reduce manual maintenance costs and frequency conversion technology to save energy, reduce consumption, and extend equipment life.

[0028] In one embodiment provided by this utility model, such as Figure 2-3 As shown, a housing 3 is bolted to one side of the top outer wall of the base plate 2, and an integrated frequency converter control box 4 is bolted to the same side. The integrated frequency converter control box 4 is connected via wires to the freshwater pump 6, water supply pipeline 7, and freshwater tank 8. The integrated frequency converter control box 4 includes frequency converters for the freshwater pump 6 and freshwater tank 8, a PLC controller, and a control panel; a dechlorination control unit for filter 11, filter 212, water supply pipeline 29, and water supply pipeline 313; and an online residual chlorine monitor. The system includes a chlorine sensor, a disinfection unit (15), a disinfection control unit for water supply pipeline 5 (16), a frequency converter, a PLC controller, and a control panel for hot water tank 18 and circulating pump 21, a control panel, a frequency converter, and two frequency converters for electromagnetic heating furnace 23 and water supply pipeline 24, and a pressure sensor and flow monitor installed on freshwater tank 8. The system comprises an inlet pipeline 5, three freshwater pumps 6, a water supply pipeline 1 (7), and freshwater tank 8, along with corresponding frequency converters, PLC controllers, control panels, pressure sensors, and flow monitors. A freshwater pressure system; filters 11 and 22 are equipped with backwashing and drainage mechanisms. Filters 11 and 22, water supply pipelines 29 and 313, together with the backwashing mechanism, drainage mechanism, dechlorination control unit, online residual chlorine monitor, and residual chlorine sensor, can form a dechlorination filtration system; sterilizer 15 is equipped with an ultraviolet sensor and electronic flow switch. Sterilizer 15, together with the corresponding disinfection control unit, ultraviolet sensor, and electronic flow switch, can form an ultraviolet disinfection system; hot water tank 18 is equipped with a float level switch, temperature sensor, and thermometer. Hot water tank 18, water supply pipeline 720, circulation pump 21, water supply pipeline 822, together with the corresponding float level switch, temperature sensor, thermometer, frequency converter, PLC controller, and control panel, can form a hot water storage and circulation system; electromagnetic heater 23 and water supply pipeline 24, together with the corresponding control panel, frequency converter, and two frequency converters, can form an electromagnetic heating and water supply system.

[0029] Example 1

[0030] A frequency converter-controlled freshwater supply system for an offshore platform includes a freshwater tank 1 and a bottom plate 2. Three freshwater pumps 6, each a centrifugal pump, are bolted to the outer wall of one side of the bottom plate 2, forming a freshwater pump group 6. The inlets of the three pumps 6 are connected to inlet pipes 5 via flanges, and the outlets are connected to outlet pipes 7 via flanges. One end of the inlet pipes 5 extends into the interior of the freshwater tank 1. A freshwater tank 8, serving as a buffer tank, is bolted to the outer wall of one side of the bottom plate 2. The buffer tank stores and buffers the freshwater supplied by the freshwater pump 6. A safety valve is installed at the top to prevent damage from system overpressure. A drain valve is installed at the bottom for automatic drainage. One end of the water supply pipeline 7 extends into the freshwater tank 8. A second water supply pipeline 9 is installed on one side of the outer wall of the freshwater tank 8 via a flange. A production water module 10, filter 11, and filter 22 are bolted to one side of the outer wall of the base plate 2. The three ends of the second water supply pipeline 9 extend to the freshwater tank 8 and filter 11, respectively. Filter 11 and Filter 22 are made of stainless steel and have multiple layers of activated carbon filter media installed inside to adsorb chlorine molecules and other impurities in the water. The control unit uses time control to control the chlorination removal filter to discharge, switch and backwash, so as to realize the regular discharge, switching and backwashing of the chlorination removal filter to ensure the chlorination removal and filtration effect of the device. The residual chlorine detector monitors and displays the residual chlorine content in the water in real time. When the chlorine content in the water exceeds the standard, the detector will sound an alarm. Water supply pipe 313 is installed between Filter 11 and Filter 22 through a flange, and water supply pipe 414 is installed between Filter 11 and Filter 22 through a flange. Two sterilizers 15 are bolted to one side of the outer wall of the base plate 2. The sterilizer 15 is equipped with ultraviolet lamp group, reflector, quartz sleeve and water flow channel. The electronic flow switch is installed on the water inlet pipe of the ultraviolet sterilizer by external thread connection. The electrical interface of the flow switch is connected to the controller. When the electronic flow switch detects that the water flow in the pipeline has reached the preset value, the controller will automatically control the ultraviolet sterilizer to work, which is used to kill various microorganisms in the water; when the electronic flow switch detects that the water flow in the pipeline has not reached the preset value, the controller will automatically control the ultraviolet sterilizer to stop working. The ultraviolet sensor is installed in the ultraviolet sterilizer with external threads, which monitors the irradiation intensity of the ultraviolet lamp group in real time, converts the light intensity signal into an electrical signal, and transmits it to the control system.When the ultraviolet sterilizer malfunctions, such as lamp damage, sensor failure, or control system abnormality, the system will immediately issue an alarm signal. The two ends of the water supply pipe 14 extend into the two sterilizers 15 respectively. A water supply pipe 16 is installed between the two sterilizers 15 via a flange. A domestic water module 17 and a hot water tank 18 are bolted to one side of the outer wall of the base plate 2. The hot water tank 18 is made of stainless steel and has an external insulation layer to maintain the temperature of the hot water inside. A safety valve is installed at the top to prevent damage from system overpressure, and a drain valve is installed at the bottom for automatic drainage. An internal flange-type magnetic float level switch is also installed. The electrical interface is connected to the PLC controller of the hot water circulation device and the frequency converter control unit of the electromagnetic heating device. When the liquid level in the hot water tank 18 is too low, the PLC controller of the hot water circulation device and the frequency converter control unit of the electromagnetic heating device respectively instruct the hot water circulation pump 21 and the electromagnetic heating furnace 23 to stop running to prevent equipment damage. At the same time, a buzzer alarm is sounded to remind the staff to troubleshoot the fault. When the liquid level in the hot water tank 18 reaches a high level, the PLC controller of the fresh water pressure system connected to the liquid level monitoring system will automatically control the fresh water pump 6 to stop running and sound an alarm. The two ends of the water supply pipeline 16 are respectively connected to the domestic water module 17 and the hot water tank 18. 8 are connected together. A water supply pipe 19 is bolted to one side of the outer wall of the hot water tank 18. Two circulation pumps 21 are bolted to one side of the outer wall of the base plate 2. The operation and stop of the circulation pumps 21 are controlled by a frequency converter control unit. The frequency converter control unit compares the hot water temperature signal monitored by the temperature sensor with the system's set target temperature, and uses a PID algorithm to instruct the frequency converter to change the output frequency, adjusting the speed of the hot water circulation pump 21 motor to increase or decrease the flow rate of hot water from the circulation pump 21 into the electromagnetic heater 23, ensuring a constant hot water temperature. Two water supply pipes 20 are installed between the inlets of the two circulation pumps 21 and the hot water tank 18. Two circulating pumps 21 have water supply pipes 22 installed at their outlets via flanges. Two electromagnetic heaters 23 are bolted to the outer wall of one side of the base plate 2. The frequency converter control unit compares the temperature signal monitored by the temperature sensor with the system's set target temperature and controls the frequency converter to work through PID algorithm instructions, adjusting the power frequency and output power of the electromagnetic heaters 23 to achieve precise control of the electromagnetic heaters 23 and the hot water temperature. The drain valve is used for automatic drainage. The two ends of the water supply pipe 22 are connected to the two electromagnetic heaters 23 respectively. The outlets of the two electromagnetic heaters 23 are connected to water supply pipes 24 via flanges.

[0031] Example 2

[0032] This embodiment further defines the features of Embodiment 1. A housing 3 is bolted to one side of the top outer wall of the base plate 2, and an integrated frequency converter control box 4 is bolted to the same side. The integrated frequency converter control box 4 is connected via wires to the freshwater pump 6, water pipeline 7, and freshwater tank 8. The integrated frequency converter control box 4 includes frequency converters for the freshwater pump 6 and freshwater tank 8, a PLC controller, and a control panel. Filter 11, Filter 2, Water pipeline 2, and Water pipeline 3 are used for... The system includes a chlorine control unit, an online residual chlorine monitor and a residual chlorine sensor; a disinfection control unit for sterilizer 15 and water supply pipeline 5 16; a frequency converter, PLC controller and control panel for hot water tank 18 and circulating pump 21; a control panel, frequency converter and two frequency converters for electromagnetic heating furnace 23 and water supply pipeline 24; a pressure sensor and flow monitor are installed on freshwater tank 8; and the system includes inlet pipeline 5, three freshwater pumps 6, water supply pipeline 1 7, and freshwater tank 8, along with corresponding frequency converters, PLC controllers, control panels and pressure sensors. A flow monitoring device constitutes a freshwater pressure system; filters 11 and 12 are equipped with backwashing and sewage discharge mechanisms. Filters 11 and 12, water supply pipelines 2 and 3, together with the backwashing and sewage discharge mechanisms, dechlorination control unit, online residual chlorine monitor, and residual chlorine sensor, constitute a dechlorination filtration system; sterilizer 15 is equipped with an ultraviolet sensor and electronic flow switch. Sterilizer 15, together with the corresponding disinfection control unit, ultraviolet sensor, and electronic flow switch, constitutes an ultraviolet disinfection system; hot water tank 18 is equipped with a float level switch, temperature sensor, and thermometer. Hot water tank 18, water supply pipeline 7 20, circulation pump 21, water supply pipeline 8 22, together with the corresponding float level switch, temperature sensor, thermometer, frequency converter, PLC controller, and control panel, constitute a hot water storage and circulation system; electromagnetic heater 23 and water supply pipeline 24, together with the corresponding control panel, frequency converter, and two frequency converters, constitute an electromagnetic heating and water supply system.

[0033] Working principle: Through the above-mentioned multi-level frequency conversion control and modular collaboration, the system achieves efficient, stable, and intelligent operation of the entire process of freshwater supply, purification, heating, and circulation. The specific operation steps of this process are as follows:

[0034] 1. Freshwater pressure system

[0035] Water in freshwater tank 1 is drawn by three parallel freshwater pumps 6 through inlet pipe 5 and transported to freshwater tank 8 through water delivery pipe 7.

[0036] A pressure sensor is installed on the top of the freshwater tank 8 to monitor the water pressure inside the tank in real time and transmit the signal to the PLC controller. The controller uses a PID algorithm to adjust the inverter output of the freshwater pump 6, dynamically adjusting the pump speed to maintain a constant system pressure.

[0037] When the pressure is lower than the set value, start 1-3 pumps to boost the pressure.

[0038] Once the pressure reaches the target level, the pump will automatically switch operation to avoid wear on a single pump.

[0039] Automatic pump shutdown protection device when freshwater tank 1 is at a low level or hot water tank 18 is at a high level.

[0040] 2. Chlorine removal filtration system

[0041] Water from the outlet of freshwater tank 8 is delivered to parallel filters 11 and 12 via pipeline 29, where activated carbon filter media adsorbs chloride ions and impurities.

[0042] Online residual chlorine monitors the outlet water quality in real time:

[0043] An alarm is triggered when residual chlorine exceeds the standard.

[0044] The backwashing mechanism and sewage discharge mechanism are controlled at regular intervals via water supply lines 3.13 and 4.14, which automatically switch filters and clean dirt to ensure filtration efficiency.

[0045] 3. Ultraviolet disinfection system

[0046] The filtered water enters the parallel sterilizer 15 through water supply pipeline 4 14, where ultraviolet lamps with a wavelength of 254nm kill microorganisms.

[0047] Electronic flow switch monitors water flow:

[0048] Disinfection will be initiated when the flow rate reaches the target.

[0049] If the flow rate is insufficient or the UV intensity is abnormal, an alarm will be triggered and the backup sterilizer 15 will be switched on.

[0050] 4. Hot water storage and circulation system

[0051] After disinfection, the water enters the hot water tank 18 through the water supply pipeline 16, and is then driven by the circulation pump 21 to flow through the electromagnetic heating furnace 23 for heating.

[0052] The float level switch controls the water level; when the water level is low, the pump and heating are stopped.

[0053] The temperature sensor provides feedback on the water temperature, and the PLC controller adjusts the speed of the circulating pump 21 and the electromagnetic heating power of the water supply pipeline 7 20 and water supply pipeline 8 22 to maintain a constant temperature.

[0054] 5. Electromagnetic heating water supply system

[0055] Hot water is delivered to the living area via water supply pipeline 24, and return water is returned to the hot water tank 18 via water supply pipeline 19.

[0056] Electromagnetic heating furnace 23 adjusts its heating power via a frequency converter:

[0057] Increase power when the water temperature is lower than the set value;

[0058] Once the water temperature reaches the target level, the frequency will be reduced or the machine will be shut down to save energy.

[0059] 6. Integrated control logic

[0060] The integrated frequency converter control box 4 integrates the control units of various subsystems:

[0061] The PLC controller coordinates and manages pressure, flow, temperature, and residual chlorine parameters.

[0062] The control panel displays the operating status and supports remote monitoring and alarms;

[0063] The freshwater pump 6, circulating pump 21, sterilizer 15, and electromagnetic heating furnace 23 feature a dual redundancy design to ensure seamless switching in case of failure.

[0064] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A frequency conversion controlled freshwater supply system for an offshore platform, comprising a freshwater tank (1) and a bottom plate (2), characterized in that, Three freshwater pumps (6) are bolted to one side of the outer wall of the base plate (2), and the inlets of the three freshwater pumps (6) are connected to inlet pipes (5) via flanges. The outlets of the three freshwater pumps (6) are connected to a first water supply pipe (7) via flanges. One end of the inlet pipe (5) extends into the interior of the freshwater tank (1). A freshwater tank (8) is bolted to one side of the outer wall of the base plate (2), and one end of the first water supply pipe (7) extends into the interior of the freshwater tank (8). A second water supply pipe (9) is connected to one side of the outer wall of the freshwater tank (8) via flanges. (2) A production water module (10), filter one (11) and filter two (12) are bolted to one side of the outer wall. The three ends of the water supply pipeline two (9) extend to the fresh water tank (8), filter one (11) and filter two (12) respectively. A water supply pipeline three (13) is installed between filter one (11) and filter two (12) through a flange. A water supply pipeline four (14) is installed between filter one (11) and filter two (12) through a flange. Two sterilizers are bolted to one side of the outer wall of the base plate (2). (15) The two ends of the water supply pipeline four (14) extend into the interior of the two sterilizers (15) respectively. A water supply pipeline five (16) is installed between the two sterilizers (15) through a flange. A domestic water module (17) and a hot water tank (18) are installed on one side of the outer wall of the base plate (2) by bolts. The two ends of the water supply pipeline five (16) are connected to the domestic water module (17) and the hot water tank (18) respectively. A water supply pipeline six (19) is installed on one side of the outer wall of the hot water tank (18) by bolts. The bottom plate (2) is on one side of the outer wall of the base plate (2) Two circulation pumps (21) are bolted to the outer wall, and two water supply pipes (20) are installed between the inlet of the two circulation pumps (21) and the hot water tank (18). Water supply pipes (22) are installed at the outlet of the two circulation pumps (21) through flanges. Two electromagnetic heating furnaces (23) are bolted to one side of the outer wall of the base plate (2). The two ends of the water supply pipes (22) are connected to the two electromagnetic heating furnaces (23) respectively. Water supply pipes (24) are installed at the outlet of the two electromagnetic heating furnaces (23) through flanges.

2. The frequency conversion control freshwater supply system for offshore platforms according to claim 1, characterized in that, The outer wall of the top side of the base plate (2) is bolted with a housing (3), and the outer wall of the top side of the base plate (2) is bolted with an integrated frequency converter control box (4). The integrated frequency converter control box (4) is connected to the fresh water pump (6), the first water supply pipeline (7), and the fresh water tank (8) through wires. The integrated frequency converter control box (4) includes frequency converters, PLC controllers, and control panels for the fresh water pump (6) and the fresh water tank (8), dechlorination control units, online residual chlorine monitors, and residual chlorine sensors for the first filter (11), the second filter (12), the second water supply pipeline (9), and the third water supply pipeline (13), disinfection control units for the sterilizer (15) and the fifth water supply pipeline (16), frequency converters, PLC controllers, and control panels for the hot water tank (18) and the circulating pump (21), and control panels, frequency converters, and two frequency converters for the electromagnetic heating furnace (23) and the water supply pipeline (24).

3. A frequency conversion controlled freshwater supply system for offshore platforms according to claim 2, characterized in that, The freshwater tank (8) is equipped with a pressure sensor and a flow monitor. The inlet pipe (5), three freshwater pumps (6), water supply pipe (7), and freshwater tank (8) together with the corresponding frequency converter, PLC controller, control panel, pressure sensor, and flow monitor constitute a freshwater pressure system.

4. A frequency conversion controlled freshwater supply system for offshore platforms according to claim 2, characterized in that, The filter one (11) and filter two (12) are equipped with a backwashing mechanism and a sewage discharge mechanism. The filter one (11), filter two (12), water supply pipeline two (9), and water supply pipeline three (13) together with the backwashing mechanism, sewage discharge mechanism, dechlorination control unit, online residual chlorine monitor and residual chlorine sensor can form a dechlorination filtration system.

5. A frequency conversion controlled freshwater supply system for offshore platforms according to claim 2, characterized in that, The sterilizer (15) is equipped with an ultraviolet sensor and an electronic flow switch. The sterilizer (15), together with the corresponding disinfection control unit, ultraviolet sensor and electronic flow switch, can form an ultraviolet disinfection system.

6. A frequency conversion controlled freshwater supply system for offshore platforms according to claim 2, characterized in that, The hot water tank (18) is equipped with a float level switch, a temperature sensor, and a thermometer. The hot water tank (18), water supply pipeline seven (20), circulation pump (21), and water supply pipeline eight (22), together with the corresponding float level switch, temperature sensor, thermometer, frequency converter, PLC controller, and control panel, can form a hot water storage and circulation system.

7. A frequency conversion controlled freshwater supply system for offshore platforms according to claim 2, characterized in that, The electromagnetic heating furnace (23), water supply pipeline (24), together with the corresponding control panel, frequency converter and two frequency converters, can form an electromagnetic heating and water supply system.

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