A containerized water pretreatment BOP system for hydrogen production by water electrolysis

Abstract

This invention relates to the field of water treatment and clean energy production technology, and discloses a containerized water pretreatment BOP system for hydrogen production via water electrolysis. It includes: a container body; and, arranged within the container body, a central corridor, a water storage system, a pumping system, an auxiliary filtration system, a multi-stage water treatment system, and a piping system. A set of water treatment loops operates in a cascaded purification manner. Each water treatment loop is configured such that water stored in a starting water tank within a set of storage tanks is first passed through an inlet pump in the pumping system, then through / without passing through an auxiliary filter (serving as a safety filter) in the auxiliary filtration system, and then through one or more water treatment devices for treatment. The treated product water is then passed through / without passing through an auxiliary filter (serving as a retention filter) in the auxiliary filtration system, and finally returned to a final water storage tank within the set of storage tanks. It features high integration and optimized space layout.

Description

Technical Field

[0001] This invention relates to the field of water treatment and clean energy production technology, specifically to a containerized water pretreatment BOP system for hydrogen production by water electrolysis. Background Technology

[0002] Hydrogen energy, as a clean and efficient secondary energy source, plays a crucial role in the global energy transition. Generating "green hydrogen" through renewable energy sources (such as solar and wind power) and then using that electricity to electrolyze water is currently the core technological path to achieve large-scale, low-carbon hydrogen production. In the water electrolysis hydrogen production process, especially with advanced equipment such as proton exchange membrane electrolyzers, extremely stringent requirements are placed on the quality of the feed water. It typically requires pure water with a resistivity of over 1 MΩ·cm to ensure electrolysis efficiency and extend equipment lifespan. Therefore, a highly efficient and reliable water pretreatment BOP (Balance of Plant) system is an indispensable and critical component of the entire water electrolysis hydrogen production plant.

[0003] Currently, water treatment systems used to produce pure water for electrolysis mainly take the following forms: The first is the traditional large-scale, stationary water treatment plant. These systems are typically built within large chemical industrial parks or hydrogen production plants, with dedicated buildings constructed through civil engineering. These buildings house activated carbon filters, reverse osmosis (RO) systems, electrodeionization (EDI) systems, and mixed-bed systems, among other water treatment units. While this type of system is technologically mature and has a large processing capacity, its disadvantages are also significant: 1) It occupies a large area, has a long construction period, requires extensive on-site civil engineering, piping, and electrical installation work, resulting in high investment costs; 2) The water treatment system is stationary, cannot be moved, lacks flexibility, and is difficult to adapt to the needs of distributed, modular, and rapidly deployed hydrogen production projects, especially in remote areas or renewable energy power plants. The second type is the relatively highly integrated skid-mounted water treatment equipment. This type of system integrates some treatment units onto one or more steel structure bases, which improves integration and shortens on-site installation time to a certain extent. However, existing skid-mounted systems often have the following shortcomings: 1) To simplify design, the equipment layout often fails to fully optimize space, resulting in a still large overall system footprint, or overly compact equipment arrangement, making daily operation, consumable replacement, and maintenance extremely difficult. 2) Some skid-mounted systems, in pursuit of miniaturization, simplify or omit treatment stages (such as comprehensive auxiliary filtration equipment), leading to poor equipment adaptability. 3) Membrane fouling of reverse osmosis membranes is a core pain point in water treatment system operation, directly causing a decline in permeate quality, reduced permeate volume, increased operating pressure, and increased energy consumption. Currently, passive maintenance is achieved through periodic chemical cleaning, lacking intelligent control logic for dynamic and preventative regulation based on real-time water quality monitoring data. This fails to effectively delay membrane fouling, increasing operating costs and downtime. Furthermore, these systems are often designed for specific electrolytic water hydrogen production processes, with fixed quality requirements for the output water, making it difficult to flexibly output different qualities of finished water according to downstream application needs.

[0004] In summary, existing technologies still have significant room for improvement in providing a water pretreatment BOP system for hydrogen production via water electrolysis that can achieve high integration, optimized spatial layout, complete process flow, flexible output of finished water of different qualities, convenient maintenance, and intelligent operation capabilities. In particular, how to scientifically arrange a complete cascade purification loop—from raw water pretreatment, multi-stage reverse osmosis purification, electro-deionization refining, to final pure water production—within a standard container, and integrate efficient concentrate recovery and intelligent membrane fouling control strategies to meet the high standards, modularity, and intelligence requirements of modern water electrolysis for hydrogen production systems, remains a pressing technical problem to be solved. Summary of the Invention

[0005] The purpose of this invention is to provide a containerized water pretreatment BOP system for hydrogen production by water electrolysis, in order to solve the technical problem of how to achieve high integration, optimized spatial layout, and flexible output of finished water of different qualities according to the needs of downstream applications.

[0006] This invention provides a containerized water pretreatment BOP system for hydrogen production via water electrolysis, comprising: a container body; and the following facilities arranged within the container body: a central corridor, arranged along the centerline of the container body's length, forming left-side and right-side equipment spaces on either side of the central corridor; the floor plate of the central corridor is detachably mounted on the bottom beam of the container body, forming a lower equipment space below the floor plate and an upper equipment space above the central corridor; and a water storage system arranged within the left-side equipment space, comprising equipment arranged sequentially from the front to the rear of the left-side equipment space. A set of water storage tanks; a pumping system, located in the left-hand equipment space and following the water storage system, comprising a set of inlet pumps arranged sequentially along the length of the container; an auxiliary filtration system, located in the middle of the right-hand equipment space, comprising a set of auxiliary filters mounted on an auxiliary filtration system support; and a multi-stage water treatment system, located in the right-hand equipment space and distributed before and after the auxiliary filtration system, comprising a first water treatment system capable of producing first product water that meets the requirements for alkaline water electrolysis hydrogen production, a second water treatment system capable of producing second product water that meets the requirements for PEM water electrolysis hydrogen production, and a third water treatment system capable of producing... A third water treatment system for producing hydrogen from brine via electrolysis; a piping system comprising a lower piping network within the lower equipment space and an upper piping network within the upper equipment space. The piping system is configured such that a transfer station is formed between the pumping system and the auxiliary filtration system. The water storage system is connected via this transfer station to a packed bed filtration system, a multi-stage reverse osmosis system, and an electro-deionization filtration system, forming a water treatment loop. Most of the pipes connected to the pumping system in the piping system belong to the lower piping network. This water treatment loop operates in a cascade purification manner, where each water treatment... The circuit is configured such that water stored in a starting water tank in a set of water storage tanks is first passed through an inlet pump in the pumping system, then through / without passing through an auxiliary filter set as a security filter in the auxiliary filtration system, and then through one or more water treatment devices for treatment. The treated water is then passed through / without passing through an auxiliary filter set as a interception filter in the auxiliary filtration system, and finally returned to the ending water tank in the set of water storage tanks. In addition, the container body is provided with a first water output interface, a second water output interface, and a third water output interface.

[0007] As an optimization and / or instantiation of the aforementioned containerized water pretreatment BOP system for hydrogen production via water electrolysis, further: the multi-stage water treatment system includes a packed bed filtration system, a multi-stage reverse osmosis system, and an electro-deionization filtration system; the packed bed filtration system is arranged in the right-side equipment space and located behind the auxiliary filtration system, and includes a set of packed bed filters arranged sequentially along the length of the container; the multi-stage reverse osmosis system is arranged in the right-side equipment space and located in front of the auxiliary filtration system, and includes a set of reverse osmosis components mounted on the multi-stage reverse osmosis system support; the electro-deionization filtration system is arranged in a small available area in the left-side or right-side equipment space and includes an electro-deionization filtration system. The apparatus includes a multi-stage reverse osmosis system comprising a disc tube reverse osmosis system and a two-stage spiral wound reverse osmosis system. The disc tube reverse osmosis system is located in the right-hand equipment space, preceding the auxiliary filtration system, and includes a set of disc tube reverse osmosis modules and a disc tube reverse osmosis inlet-side high-pressure pump. The two-stage spiral wound reverse osmosis system is located in the right-hand equipment space, preceding the disc tube reverse osmosis system, and includes a first-stage spiral wound reverse osmosis membrane module and a first-stage spiral wound reverse osmosis inlet-side high-pressure pump, as well as a second-stage spiral wound reverse osmosis membrane module and a second-stage spiral wound reverse osmosis inlet-side high-pressure pump. Furthermore, the packed bed filtration system includes a pretreatment filter, a water softening filter, and a desalination mixed bed filter. Each water treatment loop includes at least... The system includes a raw water pretreatment loop, a disc tube reverse osmosis (RO) loop, a first-stage spiral wound RO loop, a second-stage spiral wound RO loop, an electro-deionization filtration loop, a desalination mixed bed RO loop, and a concentrate recovery and softening loop. The raw water pretreatment loop is configured such that water from the pretreatment tank in the storage system is pumped into a pretreatment filter via a corresponding first inlet pump in the pumping system for purification, and the permeate from the pretreatment filter is then fed into the DTRO raw water tank in the storage system. The disc tube reverse osmosis (RO) loop is configured such that water from the DTRO raw water tank is sequentially pumped through a corresponding second inlet pump in the pumping system and then through a corresponding auxiliary filtration system (which also serves as a safety filter). The first auxiliary filter of the filter and the high-pressure pump on the inlet side of the disc tube reverse osmosis are used to send water into a set of disc tube reverse osmosis modules for water purification treatment. The product water output from this set of disc tube reverse osmosis modules is then input into the first-stage RO raw water tank in the water storage system. The first-stage spiral reverse osmosis treatment loop is configured such that the water stored in the first-stage RO raw water tank is sequentially sent into a set of first-stage spiral reverse osmosis membrane modules for water purification treatment through the corresponding third inlet pump in the pumping system, the corresponding second auxiliary filter in the auxiliary filtration system (which also serves as a safety filter), and the high-pressure pump on the inlet side of the first-stage spiral reverse osmosis module. The product water output from this set of first-stage spiral reverse osmosis membrane modules is then input into the second-stage RO raw water tank in the water storage system.The two-stage spiral wound reverse osmosis (RO) treatment loop is configured such that the water stored in the two-stage RO raw water tank is sequentially fed into a set of two-stage spiral wound reverse osmosis membrane modules through the corresponding fourth inlet pump in the pumping system, the corresponding third auxiliary filter (which also serves as a safety filter) in the auxiliary filtration system, and the high-pressure pump on the inlet side of the two-stage spiral wound RO system for water purification. The permeate from this set of two-stage spiral wound RO membrane modules is then input into the EDI raw water tank in the water storage system. The electro-deionization filtration loop is configured such that the water stored in the EDI raw water tank is sequentially fed into an electro-deionization filtration device through the corresponding fifth inlet pump in the pumping system and the corresponding fourth auxiliary filter (which also serves as a safety filter) in the auxiliary filtration system for water purification. The permeate from the electro-deionization filtration device is then input into the EDI permeate tank in the water storage system. The desalination mixed bed treatment loop is configured such that the water stored in the EDI permeate tank is sequentially fed into a desalination mixed bed filter through the corresponding sixth inlet pump in the pumping system for water purification. The permeate from the desalination mixed bed filter is then input into the EDI permeate tank in the water storage system. The permeate water output from the filter is fed into the final pure water tank in the storage system via the fifth auxiliary filter in the auxiliary filtration system, which also functions as a resin retention filter. The concentrate recovery and softening circuit is configured as follows: concentrate from a single-stage spiral wound reverse osmosis membrane module is returned to the DTRO raw water tank; concentrate from a single-stage spiral wound reverse osmosis membrane module is returned to the first-stage RO raw water tank; concentrate from the electro-deionization filter is returned to the first-stage RO raw water tank; concentrate from a single disc tube reverse osmosis module is fed into the DTRO concentrate tank in the storage system; water from the DTRO concentrate tank is then pumped into the water softening filter via the corresponding seventh inlet pump in the pumping system; permeate water from the water softening filter is fed into the brine tank in the storage system via the sixth auxiliary filter in the auxiliary filtration system, which also functions as a resin retention filter. The third permeate water output port is connected to the brine tank; the second permeate water output port is connected to the final pure water tank; and the first permeate water output port is connected to the EDI permeate tank.

[0008] As an optimization and / or instantiation of the containerized water pretreatment BOP system for hydrogen production by water electrolysis described above, further: the pretreatment filter consists of a quartz sand filter and an oil removal filter connected in series; the quartz sand filter, oil removal filter, water softening filter, and desalination mixed bed filter are each an independent packed bed filter.

[0009] As an optimization and / or instantiation of the aforementioned containerized water pretreatment BOP system for hydrogen production via water electrolysis, further: a set of water treatment loops also includes a first packed bed filter regeneration loop, a second packed bed filter regeneration loop, and a multi-stage reverse osmosis system chemical cleaning loop; the first packed bed filter regeneration loop is configured to send water stored in the DTRO raw water tank in the storage system to the pretreatment filter for backwashing via the corresponding eighth inlet pump in the pumping system, and then input the backwash water output from the pretreatment filter into the wastewater tank in the storage system; the second packed bed filter regeneration loop is configured as follows... The water stored in the regeneration salt tank of the water storage system is sent to the water softening filter through the sixth inlet pump or to the desalination mixed bed filter through the seventh inlet pump for resin regeneration treatment. The regenerated liquid output from the water softening filter or the desalination mixed bed filter is then input into the wastewater tank of the water storage system. The chemical cleaning loop of the multi-stage reverse osmosis system is configured such that the water stored in the chemical cleaning tank of the water storage system is sequentially sent to each reverse osmosis component for chemical cleaning treatment through the corresponding ninth inlet pump in the pumping system and the corresponding seventh auxiliary filter in the auxiliary filtration system, which also serves as a safety filter. The chemical cleaning liquid output from each reverse osmosis component is then returned to the chemical cleaning tank.

[0010] As an optimization and / or instantiation of the aforementioned containerized water pretreatment BOP system for hydrogen production by water electrolysis, further: an electrochemical regeneration unit is coupled to the regeneration salt tank. The electrochemical regeneration unit is a bipolar membrane-based electrolysis device. The inlet of the electrochemical regeneration unit is connected to the regeneration salt tank to receive the salt solution in the regeneration salt tank. The electrochemical regeneration unit is configured to, under the action of an electric field, decompose water molecules into hydrogen ions and hydroxide ions using its internal bipolar membrane, while simultaneously separating cations and anions in the salt solution. Hydrogen ions combine with anions to generate an acidic regeneration solution in situ, and hydroxide ions combine with cations to generate an alkaline regeneration solution in situ. The salt solution in the regeneration salt tank is sent to a water softening filter for resin regeneration treatment via a sixth inlet pump. The acidic and alkaline regeneration solutions generated by the electrochemical regeneration unit are sent to a desalination mixed bed filter for resin regeneration treatment via a seventh inlet pump.

[0011] As an optimization and / or instantiation of the aforementioned containerized water pretreatment BOP system for hydrogen production by water electrolysis, further: the auxiliary filtration system also includes a pipeline mixer mounted on the auxiliary filtration system support. The pipeline mixer is connected in series with the first auxiliary filter on the disc tube reverse osmosis treatment loop and is connected to the scale inhibitor addition tank, reducing agent addition tank and hydrochloric acid addition tank in the water storage system through the chemical addition pipeline in the pipeline network system. The scale inhibitor addition tank, reducing agent addition tank, hydrochloric acid addition tank and the electro-deionization filter are all placed on a small water storage tank mounting bracket mounted above the pumping system.

[0012] As an optimization and / or instantiation of the aforementioned containerized water pretreatment BOP system for hydrogen production via water electrolysis, further: each inlet pump in the pumping system is a vertical multistage centrifugal pump, forming a set of vertical multistage centrifugal pumps; the input ends of this set of vertical multistage centrifugal pumps are respectively connected to an input pipe arranged along the width direction of the container body, and the inlet ends of each input pipe are staggered in the width direction of the container body and each has a forward-joining 90-degree elbow; the output ends of this set of vertical multistage centrifugal pumps are respectively connected to an output pipe arranged along the width direction of the container body and staggered in the height direction from the corresponding input pipe through a reversing pipe structure, and the outlet ends of each output pipe are staggered in the width direction of the container body and each has a forward-joining 90-degree elbow; each reversing pipe structure includes connecting the input pipe on the input end of the corresponding vertical multistage centrifugal pump to the corresponding vertical multistage centrifugal pump. The pump's output end is connected to a U-shaped pipe, a first L-shaped pipe is connected to the U-shaped pipe via a first tee pipe located on the U-shaped pipe near the input end of the corresponding vertical multistage centrifugal pump, and a second L-shaped pipe is connected to the U-shaped pipe via a second tee pipe located on the U-shaped pipe near the output end of the corresponding vertical multistage centrifugal pump; each U-shaped pipe is connected to the corresponding output pipe via the corresponding first L-shaped pipe and is staggered from the corresponding input pipe in the height direction; each U-shaped pipe is connected to a common vent pipe via the corresponding second L-shaped pipe; the common vent pipe is arranged horizontally along the length of the container and has a normally closed discharge port at one end; each input pipe has a first valve located between its connection point with the corresponding U-shaped pipe and the input end of the corresponding vertical multistage centrifugal pump; each U-shaped pipe has a second valve located between the corresponding first tee pipe and the corresponding input pipe; each first L-shaped pipe has a third valve; and each second L-shaped pipe has a fourth valve.

[0013] As an optimization and / or instantiation of the containerized water pretreatment BOP system for hydrogen production by water electrolysis described above, further: the chemical addition pipeline is arranged vertically, with its lower end connected to a common drain pipe, and its upper end connected to the scale inhibitor addition tank, the reducing agent addition tank, and the hydrochloric acid addition tank, respectively; and, except for the fourth valve on the second L-shaped pipe corresponding to the second inlet pump which is normally open, the other fourth valves are normally closed.

[0014] As an optimization and / or instantiation of the containerized water pretreatment BOP system for hydrogen production by water electrolysis described above, further: the disc tube reverse osmosis system is equipped with an internal circulation system with an internal circulation pump. The internal circulation system is configured such that the concentrate outlet of a set of disc tube reverse osmosis modules is split into a circulation pipeline and a discharge pipeline; the concentrate in the circulation pipeline is pressurized by the internal circulation pump and then merges with the inlet water from the outlet of the high-pressure pump on the inlet side of the disc tube reverse osmosis module, and both enter the inlet of the set of disc tube reverse osmosis modules; the concentrate in the discharge pipeline flows to the DTRO concentrate tank; and the flow ratio between the circulation pipeline and the discharge pipeline is adjustable.

[0015] As an optimization and / or instantiation of the aforementioned containerized water pretreatment BOP system for hydrogen production by water electrolysis, it further includes: a control system; a water quality sensor, installed in the disc tube reverse osmosis treatment loop to monitor the quality of the permeate water from the disc tube reverse osmosis system and connected to the control system signal; a pipeline mixer, connected in series with the first auxiliary filter on the disc tube reverse osmosis treatment loop and connected to the chemical reagent addition tank in the storage system via a chemical reagent addition pipeline in the pipeline network system; a first regulating actuator, controlled by the control system, for regulating the flow ratio in the circulation pipeline and the discharge pipeline; and a second regulating actuator, controlled by the control system, for regulating the amount of chemical reagent added to the pipeline mixer via the chemical reagent addition pipeline; wherein the control system is configured to: (a) receive real-time water quality data from the water quality sensor and compare it with a preset water quality target value; (b) when the real-time water quality data is worse than the water quality target value, adjust the first regulating actuator... (c) If, after step (b), the real-time water quality data fails to recover to the target water quality value within a preset time period, while maintaining the adjustment state of step (b), an instruction is issued to the second adjustment actuator to increase the dosage of one or more chemical agents to chemically assist in inhibiting membrane fouling until the real-time water quality data recovers to the target water quality value; (d) When the real-time water quality data recovers to the target water quality value, an instruction is issued to the second adjustment actuator to reduce the dosage of chemical agents until it recovers to the preset normal basic dosage level. Then, if the real-time water quality data can be stably maintained within the target water quality value range, an instruction is issued to the first adjustment actuator to gradually restore the ratio of the concentrate flow rate of the circulation pipeline and the discharge pipeline to the normal operating state before the execution of step (b).

[0016] Compared with existing technologies, the containerized water pretreatment BOP system for hydrogen production by water electrolysis provided by this invention has the following advantages:

[0017] First, by arranging all facilities within a single container and innovatively designing a "central corridor" as the center, with "left-side equipment space" and "right-side equipment space" on either side, and utilizing a removable base plate to create "lower equipment space" and "upper equipment space" vertically, this three-dimensional layout solves the technical pain points of limited integration and poor layout of existing skid-mounted equipment. This layout enables the containerized water pretreatment BOP system for hydrogen production via water electrolysis to achieve extremely high space utilization and integration, with complete functionality and a compact structure. The central corridor design ensures clear and convenient operation and maintenance access for all equipment, completely improving the difficulty of maintaining compact equipment. Placing most of the pipelines connected to the pumping system in the lower pipeline network keeps the central corridor and main operating interfaces clean and safe. Furthermore, the container body, as a standardized carrier, enables the entire containerized water pretreatment BOP system for hydrogen production via water electrolysis to have "plug-and-play" rapid deployment capabilities, eliminating the need for large-scale civil engineering, greatly shortening the project construction cycle, and reducing initial investment, making it particularly suitable for distributed, modular hydrogen production scenarios.

[0018] Secondly, the container body is equipped with a first water production output interface, a second water production output interface, and a third water production output interface. Specifically, the third water production output interface is connected to the brine tank, the second water production output interface is connected to the final pure water tank, and the first water production output interface is connected to the EDI water production tank. The water stored in the brine tank meets the requirements for hydrogen production via brine electrolysis, the water stored in the final pure water tank meets the requirements for hydrogen production via proton exchange membrane (PEM) electrolysis, and the water stored in the EDI water production tank meets the requirements for hydrogen production via alkaline electrolysis. Thus, the containerized water pretreatment BOP system for hydrogen production via water electrolysis of this invention can flexibly output finished water of different qualities according to downstream application needs, providing an integrated water treatment solution for hydrogen production projects employing different technological routes.

[0019] Third, by further clarifying that the multi-stage reverse osmosis system includes both disc tube reverse osmosis systems and two-stage spiral wound reverse osmosis systems, and designing a complete water treatment loop including a raw water pretreatment loop, a disc tube reverse osmosis treatment loop, a first-stage spiral wound reverse osmosis treatment loop, a second-stage spiral wound reverse osmosis treatment loop, an electro-deionization filtration loop, a desalination mixed bed treatment loop, and a concentrate recovery and softening treatment loop, the problems of incomplete process flow, poor raw water adaptability, and low water resource utilization in existing technologies are solved. The introduction of the disc tube reverse osmosis system enables the containerized water pretreatment BOP system for hydrogen production by water electrolysis in this invention to effectively treat high-salinity and high-turbidity inferior raw water, broadening its application scenarios. The design of the concentrate recovery and softening treatment loop allows for the cascaded recovery and reuse of concentrate generated by the first-stage spiral wound reverse osmosis membrane module, the second-stage spiral wound reverse osmosis membrane module, and the electro-deionization filtration device, significantly improving the system's total water recovery rate, saving water resources, and reducing operating costs.

[0020] Fourth, by specifying the pretreatment filters as a series of quartz sand filters and oil removal filters, and designing a first packed bed filter regeneration circuit, a second packed bed filter regeneration circuit, and a multi-stage reverse osmosis system chemical cleaning circuit, the containerized water pretreatment BOP system for electrolytic water hydrogen production in this invention becomes a highly self-consistent and fully maintained independent operating unit. It not only produces qualified pure water but also internally regenerates key filtration units (such as pretreatment filters, water softening filters, and desalination mixed bed filters) and chemically cleans the multi-stage reverse osmosis system, achieving autonomous maintenance throughout its entire lifecycle, reducing reliance on external auxiliary facilities, and enhancing independence and reliability.

[0021] Fifth, by adding a pipeline mixer to the auxiliary filtration system and utilizing a small storage tank mounting bracket to arrange small units such as scale inhibitor addition tanks, reducing agent addition tanks, hydrochloric acid addition tanks, and electro-deionization filters above the pumping system, the spatial layout is further optimized. This design centralizes and elevates scattered, small auxiliary equipment and chemical storage tanks, making full use of vertical space, resulting in a more regular ground space, and minimizing the dosing pipeline path, thus improving the overall compactness and layout rationality of the system.

[0022] Sixth, through meticulous design of the pumping system, employing a vertical multistage centrifugal pump equipped with a unique reversing piping structure, the maintainability and operational flexibility of the system are significantly improved. The vertical multistage centrifugal pump itself saves floor space; while the reversing piping structure, including U-shaped pipes, L-shaped pipes, and multiple valves, allows for the isolation, draining, maintenance, or replacement of any inlet pump without stopping the operation of the entire containerized water pretreatment BOP system used for electrolytic hydrogen production. This enables online maintenance of individual inlet pumps, greatly improving the system's operational reliability and availability, and reducing the risk of downtime and maintenance difficulty due to equipment failure. The design of connecting the chemical addition pipeline to the common drain pipe cleverly simplifies the piping layout, reducing the number of pipes and potential leakage points.

[0023] Seventh, by adding an internal circulation system with an internal circulation pump to the disc tube reverse osmosis system, and combining it with a control system, water quality sensors, and regulating actuators, an intelligent membrane fouling prevention and control strategy was constructed, solving the core pain point of existing technologies lacking intelligent operation and maintenance strategies. This system can monitor water quality changes in real time and adopt a tiered response measure of "physical enhancement - chemical assistance": firstly, by adjusting the flow rate ratio of the internal circulation system, it enhances the physical flushing of the membrane surface to address initial fouling with zero chemical consumption; only when physical methods are ineffective is the precise addition of chemical agents initiated. This proactive and intelligent preventative maintenance strategy can effectively delay the occurrence and development of membrane fouling, significantly extend the service life of the reverse osmosis membrane, reduce the frequency of chemical cleaning and the consumption of chemical reagents, ensure the stability of product water quality and quantity, and reduce the energy consumption and maintenance costs of long-term system operation.

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Additional aspects and advantages provided by the present invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice. Attached Figure Description

[0025] The accompanying drawings, which form part of this specification, are used to aid in understanding the invention. The contents provided in the drawings and their related descriptions in this specification can be used to explain the invention, but do not constitute an undue limitation of the invention.

[0026] Figure 1 This is an external three-dimensional view of a containerized water pretreatment BOP system for hydrogen production by water electrolysis, according to an embodiment of the present invention.

[0027] Figure 2 for Figure 1 The containerized water pretreatment BOP system for hydrogen production via water electrolysis is shown in a three-dimensional view from another perspective.

[0028] Figure 3 for Figure 1 The image shows a 3D view of a containerized water pretreatment BOP system for hydrogen production via water electrolysis, without the container itself displayed. Figure 1 (Observational angle).

[0029] Figure 4 for Figure 1 The image shows a 3D view of a containerized water pretreatment BOP system for hydrogen production via water electrolysis, without the container itself displayed. Figure 2 (Observational angle).

[0030] Figure 5 for Figure 3 The image shows a front view (orthographic projection) of a containerized water pretreatment BOP system used for hydrogen production by water electrolysis.

[0031] Figure 6 for Figure 3 The image shows a top-view orthographic projection of a containerized water pretreatment BOP system used for hydrogen production via water electrolysis.

[0032] Figure 7 for Figure 6 The diagram shows the state of a containerized water pretreatment BOP system for hydrogen production via water electrolysis, with some piping of the network system concealed.

[0033] Figure 8 for Figure 7 The diagram shows the state of the containerized water pretreatment BOP system used for hydrogen production by water electrolysis after the addition of scale inhibitor, reducing agent, and hydrochloric acid to the storage tanks.

[0034] Figure 9 for Figure 5 The diagram shows an enlarged view of a set of water storage tanks in a containerized water pretreatment BOP system used for hydrogen production by water electrolysis.

[0035] Figure 10 for Figure 8 The diagram shows an enlarged view of the pumping system in a containerized water pretreatment BOP system used for hydrogen production by water electrolysis.

[0036] Figure 11 for Figure 4 The diagram shows an enlarged view of the pumping system in a containerized water pretreatment BOP system used for hydrogen production by water electrolysis.

[0037] Figure 12 for Figure 3 The diagram shows the connection between the lower piping network and a set of water storage tanks in a containerized water pretreatment BOP system used for hydrogen production by water electrolysis.

[0038] Figure 13 for Figure 3The diagram shows the connection between the upper piping network and a set of water storage tanks in a containerized water pretreatment BOP system used for hydrogen production by water electrolysis.

[0039] Figure 14 for Figure 3 The image shows a frontal projection view (left view) of a containerized water pretreatment BOP system used for hydrogen production by water electrolysis.

[0040] Figure 15 for Figure 3 The diagram shows an enlarged view of the multi-stage reverse osmosis system in a containerized water pretreatment BOP system used for hydrogen production by water electrolysis.

[0041] Figure 16 for Figure 4 The diagram shows an enlarged view of the packed bed filtration system in a containerized water pretreatment BOP system used for hydrogen production by water electrolysis.

[0042] Figure 17 for Figure 4 The diagram shows an enlarged view of the auxiliary filtration system in a containerized water pretreatment BOP system used for hydrogen production by water electrolysis.

[0043] Figure 18 for Figure 3 The diagram shows an enlarged view of the electro-deionization filtration system in a containerized water pretreatment BOP system used for hydrogen production by water electrolysis.

[0044] Figure 19 for Figure 6 The diagram shows the state of the intermediate corridor floor plate (indicated by the yellow part) in a containerized water pretreatment BOP system for hydrogen production via water electrolysis.

[0045] Figure 20 for Figure 3 The diagram shown is a piping and instrumentation (PID) diagram of a containerized water pretreatment BOP system used for hydrogen production by water electrolysis.

[0046] Figure 21 This is a schematic diagram illustrating the principle of regenerating a water softening filter and a desalination mixed bed filter by coupling a regeneration salt tank with an electrochemical regeneration unit in a specific embodiment of the present invention.

[0047] Figure 22 for Figure 3 The image shows an actual internal photograph of a containerized water pretreatment BOP system used for hydrogen production via water electrolysis.

[0048] The diagram is labeled as follows: Container body 10, Brine tank output interface 11, Final pure water tank output interface 12, EDI permeate tank output interface 13, Intermediate corridor 20, Water storage system 30, Water storage tank 31, Final pure water tank 311, Brine tank 312, Wastewater tank 313, Regenerated brine tank 314, Pretreated raw water tank 315, EDI permeate tank 316, DTRO concentrate tank 317, DTRO raw water tank 318, Stage 1 RO raw water tank 319, Stage 2 RO raw water tank 3110, EDI raw water tank 3111, Chemical cleaning tank 3112, Scale inhibitor addition storage tank 3113, Reducing agent addition storage tank 3114, Hydrochloric acid addition storage tank 3115, Small storage tank mounting bracket 3116, Pumping system 40, Vertical multistage centrifugal pump 41, Input pipe 42, Output pipe 43. U-shaped pipe 44. First L-shaped pipe 45. Second L-shaped pipe 46. Common drain pipe connection 47. Auxiliary filtration system 50. Pipeline mixer 51. Packed bed filtration system 60. Quartz sand filter 61. Oil removal filter 62. Water softening filter 63. Desalination mixed bed filter 64. Multi-stage reverse osmosis system 70. Disc tube reverse osmosis system 71. Disc tube reverse osmosis module 711. Disc tube reverse osmosis inlet side high pressure pump 712. Internal circulation pump 713. Two-stage spiral wound reverse osmosis system 72. First stage spiral wound reverse osmosis membrane module 721. First stage spiral wound reverse osmosis inlet side high pressure pump 722. Second stage spiral wound reverse osmosis membrane module 723. Second stage spiral wound reverse osmosis inlet side high pressure pump 724. Electro-deionization filtration system 80. Piping system 90. Chemical addition pipeline 91. Control box 100. Detailed Implementation

[0049] The present invention will now be clearly and completely described in conjunction with the accompanying drawings. Those skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be particularly noted that:

[0050] The technical solutions and features provided in the various sections, including the following description, can be combined with each other without conflict. Furthermore, where possible, these technical solutions, features, and related combinations can be given specific technical subject matter and protected by relevant patents.

[0051] The embodiments of the present invention described below are generally only some embodiments and not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of patent protection.

[0052] The terms "comprising," "including," "having," and any variations thereof in this specification, the corresponding claims, and related sections are intended to cover non-exclusive inclusion. Other related terms and units can be reasonably interpreted based on the relevant content provided in this specification.

[0053] like Figures 1-20 As shown in the figure, this embodiment of the invention provides a containerized water pretreatment BOP system for hydrogen production by water electrolysis, as detailed below.

[0054] I. Overall System Structure and Spatial Layout

[0055] Please see Figure 1 and Figure 2 The containerized water pretreatment BOP system for hydrogen production via water electrolysis, as described in this embodiment of the invention, has an external form of a standard container body 10. This design endows the entire system with a high degree of integration, modularity, and mobility, enabling it to be quickly deployed as a "plug-and-play" unit at hydrogen production project sites without the need for large-scale civil engineering, thereby significantly shortening the project construction cycle and reducing initial investment. It is particularly suitable for distributed, modular hydrogen production scenarios.

[0056] It should be noted that implementing the layout of a containerized water pretreatment BOP system for hydrogen production via water electrolysis within the limited space of a standard container 10 presents significant technical challenges. The internal space of the standard container 10 is subject to strict dimensional constraints, while the water pretreatment BOP system needs to accommodate multi-stage water treatment systems, pumping systems, water storage systems, and piping systems. Not only are there numerous pieces of equipment, each with different dimensions and installation requirements, but the process flow connections between equipment, the rationality of piping routing, the provision of space for operation and maintenance, and safety requirements such as load-bearing capacity, ventilation, and heat dissipation must also be considered. How to achieve a scientific layout of all functional equipment within such a limited space, ensuring both smooth and efficient process flow and convenient operation and maintenance as well as safe and reliable system operation, is a major challenge faced by the inventors.

[0057] Please see Figures 3 to 8 and Figure 14 One of the innovations of this invention lies in its unique three-dimensional spatial layout. For example... Figure 19As shown, a central corridor 20 is provided along the centerline of the container body 10 within the system. This central corridor 20 divides the interior space of the container body 10 into a left-side equipment space and a right-side equipment space. The floor of the central corridor 20 is detachably mounted on the bottom beam of the container body 10. This design creates additional space in the vertical dimension: a lower equipment space is formed below the floor, while an upper equipment space is formed above the central corridor 20. This three-dimensional layout strategy greatly improves space utilization and ensures that all equipment has clear and convenient operation and maintenance access in a compact structure, solving the problem of difficult maintenance of compact equipment in existing technologies.

[0058] II. Main Facility Components of the System

[0059] The containerized water pretreatment BOP system for hydrogen production by water electrolysis has multiple facilities scientifically arranged within the container 10.

[0060] First is the water storage system 30. For example... Figures 3 to 9 As shown, the water storage system 30 is located in the left-hand equipment space. It comprises a set of water storage tanks 31 (all using a vertical rectangular tank structure to maximize volume), which are arranged sequentially from the front to the rear of the left-hand equipment space. According to the needs of subsequent processes, this set of water storage tanks 31 specifically includes (from left to right): final pure water tank 311, brine tank 312, wastewater tank 313, regenerated brine tank 314, pretreated raw water tank 315, EDI permeate tank 316, DTRO concentrate tank 317, DTRO raw water tank 318, stage 1 RO raw water tank 319, stage 2 RO raw water tank 3110, EDI raw water tank 3111, and chemical cleaning tank 3112. DTRO is short for "disc tube reverse osmosis," indicating a correspondence with the subsequent disc tube reverse osmosis system 71.

[0061] In addition, the water storage system 30 also includes, for example Figure 7 The scale inhibitor addition tank 3113, reducing agent addition tank 3114, and hydrochloric acid addition tank 3115 shown are collectively referred to as chemical reagent addition tanks.

[0062] These chemical dosing tanks are designed as small tanks, playing a role in "micro-volume, precise addition" within the system. Specifically, whether it's scale inhibitors to prevent membrane fouling, hydrochloric acid to adjust pH, or reducing agents to remove residual chlorine, they exist in the corresponding chemical dosing tanks in the form of high-concentration mother liquors. They only need to be injected at extremely low flow rates (e.g., a few liters per hour or even less) into the main water flow, which can reach several tons or tens of tons, via a precision metering pump (located above the pumping system 40 described below) to achieve the desired treatment effect. Therefore, small tanks are sufficient to support long-term continuous operation of the system without frequent replenishment. Using excessively large tanks not only causes potential chemical degradation and waste, but more importantly, it unnecessarily occupies valuable physical space within the space-constrained container, encroaching on the precious physical space of core treatment units such as multi-stage reverse osmosis systems.

[0063] Secondly, there is the pumping system 40. Combined with... Figure 10 and Figure 11 As shown, the pumping system 40 is arranged in the left-hand equipment space, following the water storage system 30. It comprises a set of inlet pumps arranged sequentially along the length of the container body 10. In this embodiment, each inlet pump in the pumping system 40 is a vertical multistage centrifugal pump 41 to save floor space. This pumping system 40 provides the necessary power for the water treatment loop of the entire system. Next is the packed bed filtration system 60.

[0064] Combination Figure 16 As shown, the packed bed filtration system 60 is arranged in the right-hand equipment space, located behind the auxiliary filtration system 50. It comprises a set of packed bed filters arranged sequentially along the length of the container body 10. Specifically, the packed bed filtration system 60 includes (from left to right): a pretreatment filter (consisting of a quartz sand filter 61 and an oil removal filter 62 connected in series), a water softening filter 63, and a desalination mixed bed filter 64, wherein the quartz sand filter 61, the oil removal filter 62, the water softening filter 63, and the desalination mixed bed filter 64 are each independent packed bed filters.

[0065] The containerized water pretreatment BOP system for hydrogen production via water electrolysis also includes an auxiliary filtration system 50. For example... Figure 17 As shown, the auxiliary filtration system 50 is arranged in the middle of the right-hand equipment space and includes a set of auxiliary filters (i.e., ...) mounted on the auxiliary filtration system bracket. Figure 17 (Various vertical and cylindrical filters). These filters serve as security filters or interception filters as needed in different water treatment loops. The auxiliary filtration system 50 also includes a pipe mixer 51 mounted on the same auxiliary filtration system bracket.

[0066] The multi-stage reverse osmosis system 70, which serves as the core of deep water purification, is as follows: Figure 15 As shown, it is arranged in the right-hand equipment space, located in front of the auxiliary filtration system 50. The multi-stage reverse osmosis system 70 specifically includes a disc tube reverse osmosis system 71 and a two-stage spiral wound reverse osmosis system 72. The disc tube reverse osmosis system 71 includes a set of disc tube reverse osmosis modules 711 and a disc tube reverse osmosis inlet-side high-pressure pump 712; the two-stage spiral wound reverse osmosis system 72 includes a set of first-stage spiral wound reverse osmosis membrane modules 721 and a first-stage spiral wound reverse osmosis inlet-side high-pressure pump 722, and a set of second-stage spiral wound reverse osmosis membrane modules 723 and a second-stage spiral wound reverse osmosis inlet-side high-pressure pump 724.

[0067] It should be noted that the disc tube reverse osmosis system 71 operates at very high pressure, placing high demands on the disc tube reverse osmosis inlet-side high-pressure pump 712. Therefore, the disc tube reverse osmosis inlet-side high-pressure pump 712 is positioned on the left side of the front inlet of the container body 10 (see [reference]). Figure 3 and Figure 4 As shown, this provides maximum convenience for daily inspection, regular maintenance and replacement of the disc tube reverse osmosis inlet-side high-pressure pump 712.

[0068] To obtain the high-purity water required for electrolysis, the system is equipped with an electrodeionization filtration system 80. For example... Figure 18 As shown, it includes an electro-deionization filtration unit for final purification of reverse osmosis permeate. To optimize space, the electro-deionization filtration unit, along with the aforementioned chemical dosing tank, is cleverly placed on a small tank mounting bracket 3116 mounted above the pumping system 40 (see [link to bracket]). Figure 4 The aforementioned metering pumps are also mounted on the small water storage tank mounting bracket 3116.

[0069] All of the above facilities are connected into an organic whole through a complex pipeline system. For example... Figure 12 and Figure 13 As shown, the piping system 90 includes a lower piping network located in the lower equipment space and an upper piping network located in the upper equipment space. A key design feature is that the vast majority of the piping in the piping system 90 that connects to the pumping system 40 belongs to the lower piping network. This keeps the intermediate corridor 20 and the main operating interface clean and safe, reducing the risk of tripping.

[0070] Finally, the containerized water pretreatment BOP system for hydrogen production via water electrolysis also includes a control system housed in a control box 100 located in the right-hand equipment space and behind the packed bed filtration system 60. This control system monitors the operational status of the entire containerized water pretreatment BOP system for hydrogen production via water electrolysis and executes automated control logic.

[0071] The packed bed filtration system 60, the multi-stage reverse osmosis system 70, and the electro-deionization filtration system 80 constitute a multi-stage water treatment system.

[0072] III. System's cascade water purification treatment loop and workflow

[0073] Combination Figure 20 As shown, the configuration of the pipeline system 90 forms a flexible "transfer station" connecting the pumping system 40 and the auxiliary filtration system 50. The water storage system 30 is connected to the packed bed filtration system 60, the multi-stage reverse osmosis system 70, and the electro-deionization filtration system 80 through this transfer station, forming a water treatment loop. This water treatment loop operates in a cascade purification manner, ensuring that the raw water is gradually treated into high-purity water.

[0074] The first of this set of water treatment loops is the raw water pretreatment loop. This loop is configured to pump water stored in the pretreatment raw water tank 315 of the storage system 30 into a pretreatment filter (quartz sand filter 61 and oil removal filter 62) via the corresponding first inlet pump in the pumping system 40 for water purification, removing suspended solids, grease, and other impurities. The treated water is then fed into the DTRO raw water tank 318 in the storage system 30.

[0075] Next is the disc tube reverse osmosis treatment loop. This loop is configured to sequentially pass the water stored in the DTRO raw water tank 318 through the corresponding second inlet pump in the pumping system 40, the corresponding first auxiliary filter (which also serves as a safety filter) in the auxiliary filtration system 50, and the disc tube reverse osmosis inlet-side high-pressure pump 712, ultimately sending it into a set of disc tube reverse osmosis modules 711 for water purification. This step can effectively treat low-quality raw water with high salinity and high turbidity. The product water output from the set of disc tube reverse osmosis modules 711 is input into the first-stage RO raw water tank 319 in the water storage system 30.

[0076] The water then enters the first-stage spiral wound reverse osmosis (RO) treatment loop. This loop is configured to sequentially pump the water from the first-stage RO raw water tank 319 through the corresponding third inlet pump in the pumping system 40, the corresponding second auxiliary filter (which also serves as a safety filter) in the auxiliary filtration system 50, and the first-stage spiral wound RO inlet-side high-pressure pump 722, before feeding it into a set of first-stage spiral wound RO membrane modules 721 for water purification. The product water from the set of first-stage spiral wound RO membrane modules 721 is then fed into the second-stage RO raw water tank 3110 in the water storage system 30.

[0077] Next is the two-stage spiral wound reverse osmosis treatment loop. This loop is configured to sequentially pass the water stored in the two-stage RO raw water tank 3110 through the corresponding fourth inlet pump in the pumping system 40, the corresponding third auxiliary filter (which also serves as a safety filter) in the auxiliary filtration system 50, and the high-pressure pump 724 on the inlet side of the two-stage spiral wound reverse osmosis membrane module 723 for water purification, further improving purity. The product water from the two-stage spiral wound reverse osmosis membrane module 723 is then input into the EDI raw water tank 3111 in the water storage system 30.

[0078] The fine treatment stage is completed by an electro-deionization filtration circuit. This circuit is configured to send water from the EDI raw water tank 3111 through the corresponding fifth inlet pump in the pumping system 40 and the corresponding fourth auxiliary filter in the auxiliary filtration system 50 (which also serves as a safety filter) into the electro-deionization filtration device for final deep desalination. The produced water is then input into the EDI produced water tank 316 in the water storage system 30.

[0079] As a final safeguard, a desalination mixed-bed treatment loop is used. This loop is configured to pump water from the EDI product water tank 316 into the desalination mixed-bed filter 64 via the corresponding sixth inlet pump in the pumping system 40 for water purification. The treated product water then passes through the corresponding fifth auxiliary filter in the auxiliary filtration system 50, which also functions as a resin retention filter, and finally enters the final pure water tank 311 in the water storage system 30, supplying qualified product water to the electrolyzer.

[0080] To improve water resource utilization, the system also includes a concentrate recovery and softening treatment loop. This loop is configured as follows: concentrate from a single-stage spiral wound reverse osmosis membrane module 721 is returned to the DTRO raw water tank 318; concentrate from a single-stage spiral wound reverse osmosis membrane module 723 is returned to the first-stage RO raw water tank 319; concentrate from the electro-deionization filter is returned to the first-stage RO raw water tank 319; and concentrate from a single disc tube reverse osmosis module 711 is input into the DTRO concentrate tank 317 in the water storage system 30. The water stored in the DTRO concentrate tank 317 is then pumped into the water softening filter 63 via the corresponding seventh inlet pump in the pumping system 40 for treatment. The softened permeate then passes through the corresponding sixth auxiliary filter in the auxiliary filtration system 50, which also functions as a resin retention filter, and is input into the brine tank 312 in the water storage system 30 for subsequent regeneration and other uses.

[0081] like Figure 1As shown, the container body 10 is provided with a brine tank output interface 11 (third water output interface) connected to the brine tank 312, a final pure water tank output interface 12 (second water output interface) connected to the final pure water tank 311, and an EDI water output interface 13 (first water output interface) connected to the EDI water tank 316.

[0082] IV. System's autonomous maintenance and chemical addition functions

[0083] The containerized water pretreatment BOP system for hydrogen production by water electrolysis of the present invention is a highly self-consistent unit that integrates comprehensive autonomous maintenance functions.

[0084] The self-maintenance function of the containerized water pretreatment BOP system for hydrogen production via water electrolysis is first reflected in the regeneration loop of the first packed bed filter. This regeneration loop is configured to send water from the DTRO raw water tank 318 in the water storage system 30 to the pretreatment filter via the corresponding eighth inlet pump in the pumping system 40 for backwashing, restoring its filtration performance. The backwash water is then input into the wastewater tank 313 in the water storage system 30.

[0085] The system also includes a second packed bed filter regeneration circuit. This circuit is configured to send water from the regeneration salt tank 314 in the water storage system 30 to the water softening filter 63 via a sixth inlet pump or to the desalination mixed bed filter 64 via a seventh inlet pump for resin regeneration. The regeneration waste liquid is then fed into the wastewater tank 313 in the water storage system 30.

[0086] It should be noted that the second packed bed filter regeneration circuit primarily serves the water softening filter 63. The regeneration salt tank 314 in the water storage system 30 typically stores a salt solution for hardness removal. When the resin in the water softening filter 63 becomes saturated, the sixth inlet pump is activated to pump the salt solution into the water softening filter 63 for regeneration. For the desalination mixed bed filter 64, considering the complexity and safety risks of storing and handling strong acids and alkalis on-site, its standard operating procedure is to replace it entirely after it reaches the end of its service life, rather than regenerating it on-site. However, this system is designed with flexibility: under special circumstances, if site conditions permit, operators can empty the salt solution in the regeneration salt tank 314 and temporarily replace it with a pre-mixed acid or alkali solution, and then use the seventh inlet pump to regenerate the cation and anion exchange resins in the desalination mixed bed filter 64 separately (see [link to relevant documentation]). Figure 20 (as shown), thereby extending its service life.

[0087] In an alternative embodiment, the regeneration salt tank 314 is also coupled with an electrochemical regeneration unit (ERU). In this case, the regeneration salt tank 314 only needs to store a safe, non-corrosive salt solution (e.g., sodium sulfate). Figure 21 As shown, the core of this electrochemical regeneration unit is an electrolysis device based on a bipolar membrane (BPM). Its working principle is as follows: after applying an electric field, the special bipolar membrane inside the electrochemical regeneration unit forces water molecules to decompose into hydrogen ions and hydroxide ions at its interface layer. Simultaneously, cations and anions in the salt solution pumped into the electrochemical regeneration unit from the regeneration salt tank 314 are separated under the influence of the electric field. The hydrogen ions generated by decomposition combine with anions in the salt solution to generate the acid solution required for regeneration in situ; while hydroxide ions combine with cations in the salt solution to generate the alkali solution required for regeneration in situ. During the regeneration of the desalination mixed bed filter 64, the system can use the seventh inlet pump to precisely pump the acid and alkali solutions generated by the electrochemical regeneration unit into the regeneration desalination mixed bed filter 64 step by step according to a preset program, completing fully automatic regeneration. For the regeneration of the water softening filter 63, the neutral salt solution in the regeneration salt tank 314 can still be directly pumped in through the sixth inlet pump.

[0088] The introduction of the electrochemical regeneration unit and the application scenario of this invention in the field of hydrogen production through water electrolysis have a natural and profound synergistic relationship. Hydrogen production through water electrolysis is itself an energy-intensive process, and its application site must be equipped with stable and large-capacity power infrastructure. Therefore, the core resource required for the operation of the electrochemical regeneration unit—electricity—is not an additional logistical burden in this application scenario, but rather a "local resource" that can be conveniently utilized. This cleverly replaces the external dependence on hazardous chemicals such as strong acids and strong alkalis in traditional solutions, as well as their complex transportation, storage, and management chains.

[0089] Furthermore, the multi-stage reverse osmosis system chemical cleaning circuit is also integrated within the system. The multi-stage reverse osmosis system chemical cleaning circuit is configured to sequentially send water stored in the chemical cleaning tank 3112 of the water storage system 30 through the corresponding ninth inlet pump in the pumping system 40 and the corresponding seventh auxiliary filter (which also serves as a safety filter) in the auxiliary filtration system 50 to each reverse osmosis component for chemical cleaning to remove membrane fouling. The cleaning solution is then circulated back to the chemical cleaning tank 3112.

[0090] To ensure stable system operation, the pipeline mixer 51 is connected in series with the first auxiliary filter on the disc tube reverse osmosis treatment loop. The pipeline mixer 51 is connected to the scale inhibitor tank 3113, reducing agent tank 3114, and hydrochloric acid tank 3115 in the water storage system 30 via the chemical addition pipeline 91 in the pipeline system 90. It is used to precisely add chemical agents to the feed water to adjust pH, prevent scaling, and remove oxidants, etc.

[0091] V. Refined Design of Key Components

[0092] In terms of the refined design of key components, the first step is the maintainability design of the pumping system 40. For example... Figure 10 and Figure 11 As shown, each inlet pump in the pumping system 40 is a vertical multistage centrifugal pump 41 to save floor space, and this group of vertical multistage centrifugal pumps 41 is equipped with a unique reversing pipe structure to enable online maintenance of individual pumps, which greatly improves the operational reliability and availability of the system.

[0093] The specific structure of the design is as follows: First, in terms of spatial layout, the input end of each vertical multistage centrifugal pump 41 is connected to an input pipe 42 arranged along the width direction of the container body. The output end of each vertical multistage centrifugal pump 41 is connected to an output pipe 43, also arranged along the width direction of the container body, through the following reversing pipe structure. To ensure the convenience of pipe installation and maintenance, each input pipe 42 and its corresponding output pipe 43 are staggered in the height direction. At the same time, the inlet ends of all input pipes 42 and the outlet ends of all output pipes 43 are staggered sequentially in the width direction of the container body, and each is provided with a forward-joining 90-degree elbow for easy connection to the main pipeline system at the front of the container.

[0094] Secondly, the core of achieving the "reversing" function lies in the reversing pipe structure equipped in each pump. This structure includes a U-shaped pipe 44, a first L-shaped pipe 45, and a second L-shaped pipe 46. The U-shaped pipe 44 is the key to achieving bypass, directly connecting the input pipe 42 on the side corresponding to the input end of the vertical multistage centrifugal pump 41 to the output end of the vertical multistage centrifugal pump 41. On this U-shaped pipe 44, the position near the input end of the vertical multistage centrifugal pump 41 is connected to the first L-shaped pipe 45 through a first tee pipe; while the position near the output end of the vertical multistage centrifugal pump 41 is connected to the second L-shaped pipe 46 through a second tee pipe.

[0095] Through the above connections, two critical paths are formed: 1) Bypass path: U-shaped pipe 44 is connected to the corresponding output pipe 43 via the first L-shaped pipe 45. 2) Drainage path: U-shaped pipe 44 is connected to a common drainage pipe 47 arranged horizontally along the length of the container via the second L-shaped pipe 46. One end of the common drainage pipe 47 is provided with a normally closed discharge port for centralized drainage of isolated pipelines.

[0096] To precisely control the water flow path, four valves are precisely installed on the reversing pipe structure: The first valve, located on the input pipe 42, between its connection point with the U-shaped pipe 44 and the corresponding input end of the vertical multistage centrifugal pump 41, is used to cut off the source water entering the vertical multistage centrifugal pump 41. The second valve, located on the U-shaped pipe 44, between the connection point of the first tee pipe and the input pipe 42, is used to open or close the bypass. The third valve, located on the first L-shaped pipe 45, is used to control whether the bypass water flows into the output pipe 43. The fourth valve, located on the second L-shaped pipe 46, is used to control the venting of the vertical multistage centrifugal pump 41 and related pipelines to the common vent pipe 47.

[0097] Based on this structure, when it is necessary to repair or replace a vertical multistage centrifugal pump 41, the operator can first close the first valve corresponding to the pump 41 to isolate it from the main flow. Then, the corresponding second and third valves are opened. At this point, the water flow will no longer pass through the pump 41, but will instead bypass it via the path of input pipe 42 → second valve → U-shaped pipe 44 → first L-shaped pipe 45 → third valve → output pipe 43. This achieves online bypassing of the pump 41 without stopping the entire system. After the pump 41 is isolated, opening the corresponding fourth valve allows residual water in the pump body and isolated pipe section to be discharged into the common drain pipe connection 47 through the second L-shaped pipe 46, creating conditions for safe maintenance.

[0098] Furthermore, this sophisticated design cleverly integrates the chemical dosing function. The chemical dosing pipeline 91 is vertically arranged, with its upper end connected to each chemical dosing tank, and its lower end cleverly connected to the common drain pipe 47. In this embodiment, by setting the fourth valve on the second L-shaped pipe 46 corresponding to the second inlet pump to a normally open state, while keeping the fourth valves of the other pumps normally closed, the chemical can be precisely injected into the treatment flow path of the second inlet pump via the common drain pipe 47 and the second L-shaped pipe 46 using fluid dynamics principles. This "one pipe, multiple uses" design utilizes existing pipelines to achieve the dosing function, greatly simplifying the pipeline layout and reducing additional pipelines and potential leakage points.

[0099] Another key refined design is the intelligent membrane fouling control of the disc tube reverse osmosis system 71. The disc tube reverse osmosis system 71 includes an internal circulation system with an internal circulation pump 713. The concentrate outlet of a set of disc tube reverse osmosis modules 711 is split into a circulation pipeline and a discharge pipeline. The concentrate in the circulation pipeline is pressurized by the internal circulation pump 713 and then merges with the feed water, entering the module inlet together to create a high-velocity flow that flushes the membrane surface. The control system, water quality sensors installed in the disc tube reverse osmosis treatment loop, and the first and second regulating actuators that control flow rate and reagent dosing together constitute an intelligent membrane fouling prevention and control strategy. The operational logic of this strategy is as follows: the control system receives data from water quality sensors in real time; when the water quality deteriorates below the target value, the control system instructs the first regulating actuator to reduce the flow rate in the discharge pipeline and increase the flow rate ratio in the circulation pipeline to physically enhance flushing; if the physical method is ineffective, the control system, while maintaining a high circulation flow rate, instructs the second regulating actuator to increase the dosage of chemical agents for chemical-assisted suppression; once the water quality recovers, the system gradually reduces the dosage of chemical agents and eventually restores the circulation ratio to normal. This tiered response strategy of "physical enhancement-chemical assistance" can proactively and intelligently delay membrane fouling, extend membrane life, and reduce chemical consumption and operating costs.

[0100] Based on the aforementioned collaborative control mechanism, the on-demand, precise dosing mode of chemical agents can significantly reduce the overall consumption of chemical agents. Since the system only activates chemical assistance when physical flushing is insufficient to control membrane fouling, and the dosage is dynamically adjusted based on real-time data from water quality sensors, the actual amount of chemical agents used is significantly reduced compared to traditional preventative continuous dosing or fixed-period dosing methods. This intelligent, tiered response strategy reduces agent consumption by more than 50% per unit time, thereby allowing for a corresponding reduction in the volume of the chemical agent addition storage tank, facilitating the placement of these tanks on small storage tank mounting brackets 3116.

[0101] The aforementioned containerized water pretreatment BOP system for hydrogen production via water electrolysis has the following advantages: First, by arranging all facilities within a single container 10, and innovatively designing a three-dimensional layout with a "middle corridor 20" as the center, dividing the space into "left-side equipment space" and "right-side equipment space" on both sides, and utilizing a removable base plate to create "lower equipment space" and "upper equipment space" vertically, it solves the technical pain points of limited integration and poor layout of skid-mounted equipment in existing technologies. This layout enables the containerized water pretreatment BOP system for hydrogen production via water electrolysis to achieve extremely high space utilization and integration, with complete functions and a compact structure; the design of the middle corridor 20 ensures that all equipment has clear and convenient operation and maintenance access, completely improving the problem of difficult maintenance of compact equipment; and by arranging most of the pipelines connected to the pumping system 40 in the lower pipeline network, the middle corridor 20 and the main operating interface remain clean and safe. Meanwhile, the container body 10 serves as a standardized carrier, enabling the entire containerized water pretreatment BOP system for hydrogen production via water electrolysis to be deployed quickly with a "plug and play" capability. It eliminates the need for large-scale civil engineering, greatly shortens the project construction cycle, and reduces initial investment, making it particularly suitable for distributed and modular hydrogen production scenarios.

[0102] Secondly, by further clarifying that the multi-stage reverse osmosis system 70 includes a disc tube reverse osmosis system 71 and a two-stage spiral wound reverse osmosis system 72, and designing a complete water treatment loop including a raw water pretreatment loop, a disc tube reverse osmosis treatment loop, a first-stage spiral wound reverse osmosis treatment loop, a second-stage spiral wound reverse osmosis treatment loop, an electro-deionization filtration loop, a desalination mixed bed treatment loop, and a concentrate recovery and softening treatment loop, the problems of incomplete process flow, poor raw water adaptability, and low water resource utilization rate in the prior art are solved. The introduction of the disc tube reverse osmosis system 71 enables the containerized water pretreatment BOP system for hydrogen production by water electrolysis in this invention to effectively treat poor-quality raw water with high salinity and high turbidity, thus broadening the application scenarios. The design of the concentrate recovery and softening treatment loop allows for the cascaded recovery and reuse of the concentrate generated by the first-stage spiral wound reverse osmosis membrane module 721, the second-stage spiral wound reverse osmosis membrane module 723, and the electro-deionization filtration device, significantly improving the total water recovery rate of the system, saving water resources, and reducing operating costs.

[0103] Third, by specifying the pretreatment filters as a series of quartz sand filters 61 and oil removal filters 62, and designing a first packed bed filter regeneration circuit, a second packed bed filter regeneration circuit, and a multi-stage reverse osmosis system chemical cleaning circuit, the containerized water pretreatment BOP system for electrolytic water hydrogen production in this invention becomes a highly self-consistent and fully maintained independent operating unit. It not only produces qualified pure water but also internally regenerates key filtration units (such as the pretreatment filter, water softening filter 63, and desalination mixed bed filter 64) and chemically cleans the multi-stage reverse osmosis system 70, achieving autonomous maintenance throughout its entire lifecycle, reducing reliance on external auxiliary facilities, and enhancing independence and reliability.

[0104] Fourth, by adding a pipeline mixer 51 to the auxiliary filtration system 50, and using a small water tank mounting bracket 3116 to arrange small units such as the scale inhibitor addition water tank, reducing agent addition water tank, hydrochloric acid addition water tank, and electro-deionization filtration system 80 in a three-dimensional arrangement above the pumping system 40, the spatial layout is further optimized. This design centralizes and elevates scattered, small auxiliary equipment and chemical storage tanks, making full use of vertical space, making the ground space more regular, and also minimizing the dosing pipeline path, thus improving the overall compactness and layout rationality of the system.

[0105] Fifth, through meticulous design of the pumping system 40, employing a vertical multistage centrifugal pump 41 and equipping it with a unique reversing pipe structure, the maintainability and operational flexibility of the system are significantly improved. The vertical multistage centrifugal pump 41 itself saves floor space; while the reversing pipe structure, including a U-shaped pipe 44, a first L-shaped pipe 45, a second L-shaped pipe 46, and multiple valves, allows for the isolation, draining, maintenance, or replacement of any inlet pump without stopping the operation of the entire containerized water pretreatment BOP system used for electrolytic hydrogen production. This enables online maintenance of individual inlet pumps, greatly improving the system's operational reliability and availability, and reducing the risk of downtime and maintenance difficulty due to equipment failure. The design of connecting the chemical addition pipeline 91 to the common drain pipe 47 cleverly simplifies the pipeline layout, reducing the number of pipes and potential leakage points.

[0106] Sixth, by adding an internal circulation system with an internal circulation pump 713 to the disc tube reverse osmosis system 71, and combining it with a control system, water quality sensors, and regulating actuators, an intelligent membrane fouling prevention and control strategy was constructed, solving the core pain point of existing technologies lacking intelligent operation and maintenance strategies. This system can monitor water quality changes in real time and adopt a tiered response measure of "physical enhancement - chemical assistance": firstly, by adjusting the flow rate ratio of the internal circulation system, it enhances the physical flushing of the membrane surface to address initial fouling with zero chemical consumption; only when physical methods are ineffective is the precise addition of chemical agents initiated. This proactive and intelligent preventative maintenance strategy can effectively delay the occurrence and development of membrane fouling, significantly extend the service life of the reverse osmosis membrane, reduce the frequency of chemical cleaning and the consumption of chemical reagents, ensure the stability of product water quality and quantity, and reduce the energy consumption and maintenance costs of long-term system operation.

[0107] Seventh, since the container body 10 is respectively provided with a brine tank output interface 11 connected to the brine tank 312, a final pure water tank output interface 12 connected to the final pure water tank 311, and an EDI product water tank output interface 13 connected to the EDI product water tank 316, the water stored in the brine tank 312, the water stored in the final pure water tank 311, and the water stored in the EDI product water tank 316 can be output as needed. The water stored in the brine tank 312 can meet the requirements for hydrogen production by brine electrolysis, the water stored in the final pure water tank 311 can meet the requirements for hydrogen production by proton exchange membrane electrolysis, and the water stored in the EDI product water tank 316 can meet the requirements for hydrogen production by alkaline electrolysis. In this way, the containerized water pretreatment BOP system for hydrogen production by water electrolysis of the present invention can flexibly output finished water of different qualities according to the downstream application requirements, providing an integrated water treatment solution for hydrogen production projects using different technical routes.

[0108] In summary, the containerized water pretreatment BOP system for hydrogen production via water electrolysis described above, through its innovative three-dimensional spatial layout, complete cascade purification process loop, highly self-consistent maintenance system, refined component design, and intelligent control strategy, successfully realizes a powerful, reliable, easy-to-maintain, and resource-efficient water treatment solution within a standard container 10. It perfectly solves many problems existing in current technologies and provides an ideal supporting BOP system for the water electrolysis hydrogen production industry.

[0109] The foregoing has described the relevant content of the present invention. Those skilled in the art will be able to implement the present invention based on these descriptions. All other embodiments obtained by those skilled in the art based on the foregoing content of this specification without inventive effort should fall within the scope of the present invention.

Claims

1. A containerized water pretreatment BOP system for hydrogen production by water electrolysis, characterized in that: include: A shipping container; And the following facilities arranged inside the container; The central corridor is set along the centerline of the container body and forms left and right equipment spaces on both sides of the central corridor. The bottom plate of the central corridor is detachably installed on the bottom beam of the container body. The lower equipment space is formed below the bottom plate and the upper equipment space is formed above the central corridor. The water storage system is located in the left-side equipment space and includes a set of water storage tanks arranged sequentially from the front to the rear of the left-side equipment space. The pumping system, located in the equipment space on the left and behind the water storage system, includes a set of inlet pumps arranged sequentially along the length of the container. An auxiliary filtration system, located in the middle of the right-hand equipment space, includes a set of auxiliary filters mounted on an auxiliary filtration system bracket. A multi-stage water treatment system is arranged in the right-side equipment space and distributed in front of and behind the auxiliary filtration system. It includes a first water treatment system that can produce first-stage water that meets the requirements of alkaline water electrolysis for hydrogen production, a second water treatment system that can produce second-stage water that meets the requirements of PEM water electrolysis for hydrogen production, and a third water treatment system that can produce third-stage water that meets the requirements of brine electrolysis for hydrogen production. The pipeline system includes a lower pipeline network arranged in the lower equipment space and an upper pipeline network arranged in the upper equipment space. The pipeline system is configured such that the pumping system and the auxiliary filtration system form a transfer station, and the water storage system is connected to each water treatment device in the multi-stage water treatment system through the transfer station to form a set of water treatment loops. Most of the pipelines in the pipeline system that are connected to the pumping system belong to the lower pipeline network. This set of water treatment loops operates in a cascade purification manner. Each water treatment loop is configured to first pass the water stored in the starting water tank of a set of water storage tanks through the inlet pump set in the pumping system, and then through / without passing through the auxiliary filter set as a safety filter set in the auxiliary filtration system, and then through one or more water treatment devices for treatment. Finally, the treated water is returned to the ending water tank set in the set of water storage tanks after passing through / without passing through the auxiliary filter set as a interception filter set in the auxiliary filtration system. Furthermore, the container body is equipped with a first water production output interface, a second water production output interface, and a third water production output interface; The multi-stage water treatment system includes a packed bed filtration system, a multi-stage reverse osmosis system, and an electro-deionization filtration system; the packed bed filtration system includes a set of packed bed filters arranged sequentially along the length of the container; the multi-stage reverse osmosis system includes a set of reverse osmosis components mounted on a multi-stage reverse osmosis system support; and the electro-deionization filtration system includes an electro-deionization filtration device. Furthermore, the multi-stage reverse osmosis system includes a disc tube reverse osmosis system and a two-stage spiral wound reverse osmosis system. The disc tube reverse osmosis system includes a set of disc tube reverse osmosis modules and a disc tube reverse osmosis inlet-side high-pressure pump. The two-stage spiral wound reverse osmosis system includes a set of a first-stage spiral wound reverse osmosis membrane module and a first-stage spiral wound reverse osmosis inlet-side high-pressure pump, as well as a set of a second-stage spiral wound reverse osmosis membrane module and a second-stage spiral wound reverse osmosis inlet-side high-pressure pump. The packed bed filtration system includes a pretreatment filter, a water softening filter, and a desalination mixed bed filter. A set of water treatment circuits shall include at least a raw water pretreatment circuit, a disc tube reverse osmosis treatment circuit, a first-stage spiral wound reverse osmosis treatment circuit, a second-stage spiral wound reverse osmosis treatment circuit, an electro-deionization filtration circuit, a desalination mixed bed treatment circuit, and a concentrate recovery and softening treatment circuit. The raw water pretreatment loop is configured such that the water stored in the pretreatment raw water tank in the water storage system is sent to the pretreatment filter for water purification through the corresponding first inlet pump in the pumping system, and then the product water output from the pretreatment filter is input into the DTRO raw water tank in the water storage system. The disc tube reverse osmosis treatment loop is configured such that the water stored in the DTRO raw water tank is sequentially sent to a set of disc tube reverse osmosis components for water purification treatment through the corresponding second inlet pump in the pumping system, the corresponding first auxiliary filter in the auxiliary filtration system which also serves as a safety filter, and the disc tube reverse osmosis inlet side high pressure pump. Then, the product water output from this set of disc tube reverse osmosis components is input into the first stage RO raw water tank in the water storage system. The primary spiral wound reverse osmosis treatment loop is configured such that the water stored in the primary RO raw water tank is sequentially fed into a primary spiral wound reverse osmosis membrane module through the corresponding third inlet pump in the pumping system, the corresponding second auxiliary filter in the auxiliary filtration system which serves as a security filter, and the primary spiral wound reverse osmosis inlet side high pressure pump for water purification treatment. Then, the product water output from this primary spiral wound reverse osmosis membrane module is fed into the secondary RO raw water tank in the water storage system. The two-stage spiral reverse osmosis treatment loop is configured such that the water stored in the two-stage RO raw water tank is sequentially fed into a set of two-stage spiral reverse osmosis membrane modules through the corresponding fourth inlet pump in the pumping system, the corresponding third auxiliary filter in the auxiliary filtration system which also serves as a safety filter, and the high-pressure pump on the inlet side of the two-stage spiral reverse osmosis for water purification treatment. Then, the product water output from this set of two-stage spiral reverse osmosis membrane modules is fed into the EDI raw water tank in the water storage system. The electro-deionization filtration circuit is configured such that the water stored in the EDI raw water tank is sent to the electro-deionization filtration device for water purification through the corresponding fifth inlet pump in the sequential pumping system and the corresponding fourth auxiliary filter in the auxiliary filtration system, which is used as a safety filter. Then, the product water output from the electro-deionization filtration device is input into the EDI product water tank in the water storage system. The desalination mixed bed treatment loop is configured such that the water stored in the EDI product water tank is sequentially sent to the desalination mixed bed filter for water purification treatment through the corresponding sixth inlet pump in the pumping system, and then the product water output from the desalination mixed bed filter is input into the final pure water tank in the water storage system through the corresponding fifth auxiliary filter in the auxiliary filtration system, which is used as a resin interception filter. The concentrate recovery and softening treatment loop is configured as follows: the concentrate output from a set of first-stage spiral wound reverse osmosis membrane modules is returned to the DTRO raw water tank; the concentrate output from a set of second-stage spiral wound reverse osmosis membrane modules is returned to the first-stage RO raw water tank; the concentrate output from the electro-deionization filter is returned to the first-stage RO raw water tank; the concentrate output from a set of disc tube reverse osmosis modules is input into the DTRO concentrate tank in the water storage system; the water stored in the DTRO concentrate tank is sent to the water softening filter through the corresponding seventh inlet pump in the pumping system; and the permeate output from the water softening filter is input into the brine tank in the water storage system through the corresponding sixth auxiliary filter in the auxiliary filtration system, which is used as a resin retention filter. The third water output interface is connected to the brine tank, the second water output interface is connected to the final pure water tank, and the first water output interface is connected to the EDI water tank.

2. The containerized water pretreatment BOP system for hydrogen production by water electrolysis as described in claim 1, characterized in that: The pretreatment filter consists of a quartz sand filter and an oil removal filter connected in series; the quartz sand filter, oil removal filter, water softening filter, and desalination mixed bed filter are each an independent packed bed filter.

3. The containerized water pretreatment BOP system for hydrogen production by water electrolysis as described in claim 1, characterized in that: A water treatment circuit also includes a first packed bed filter regeneration circuit, a second packed bed filter regeneration circuit, and a multi-stage reverse osmosis system chemical cleaning circuit; The first packed bed filter regeneration circuit is configured such that the water stored in the DTRO raw water tank in the water storage system is sent to the pretreatment filter for backwashing through the corresponding eighth inlet pump in the pumping system, and then the backwash water output from the pretreatment filter is input into the wastewater tank in the water storage system. The second packed bed filter regeneration circuit is configured such that the water stored in the regeneration salt tank in the water storage system is sent to the water softening filter through the sixth inlet pump or to the desalination mixed bed filter through the seventh inlet pump for resin regeneration treatment, and then the regenerated liquid output from the water softening filter or the desalination mixed bed filter is input into the wastewater tank in the water storage system. The chemical cleaning loop of the multi-stage reverse osmosis system is configured such that the water stored in the chemical cleaning tank in the water storage system is sequentially sent to each reverse osmosis component for chemical cleaning through the corresponding ninth inlet pump in the pumping system and the corresponding seventh auxiliary filter in the auxiliary filtration system, which also serves as a safety filter. Then, the chemical cleaning solution output from each reverse osmosis component is returned to the chemical cleaning tank.

4. The containerized water pretreatment BOP system for hydrogen production by water electrolysis as described in claim 3, characterized in that: A regeneration salt tank is coupled with an electrochemical regeneration unit, which is an electrolysis device based on a bipolar membrane. The inlet of the electrochemical regeneration unit is connected to the regeneration salt tank to receive the salt solution in the regeneration salt tank. The electrochemical regeneration unit is configured to decompose water molecules into hydrogen ions and hydroxide ions using an internal bipolar membrane under the action of an electric field, while separating cations and anions in the salt solution. Hydrogen ions combine with anions to generate an acidic regeneration solution in situ, and hydroxide ions combine with cations to generate an alkaline regeneration solution in situ. The salt solution in the regeneration salt tank is sent to a water softening filter for resin regeneration treatment via a sixth inlet pump. The acidic and alkaline regeneration solutions generated by the electrochemical regeneration unit are sent to a desalination mixed bed filter for resin regeneration treatment via a seventh inlet pump.

5. The containerized water pretreatment BOP system for hydrogen production by water electrolysis as described in claim 1, characterized in that: The auxiliary filtration system also includes a pipeline mixer mounted on the auxiliary filtration system support. The pipeline mixer is connected in series with the first auxiliary filter on the disc tube reverse osmosis treatment loop and is connected to the scale inhibitor addition tank, reducing agent addition tank and hydrochloric acid addition tank in the water storage system through the chemical addition pipeline in the pipeline network system. The scale inhibitor addition tank, reducing agent addition tank, hydrochloric acid addition tank and the electro-deionization filter are all placed on the small water storage tank mounting bracket mounted above the pumping system.

6. The containerized water pretreatment BOP system for hydrogen production by water electrolysis as described in claim 5, characterized in that: Each inlet pump in the pumping system is a vertical multistage centrifugal pump, thus forming a set of vertical multistage centrifugal pumps; Each of these vertical multistage centrifugal pumps has an input pipe connected to its inlet end along the width of the container. The inlet ends of each input pipe are staggered in the width of the container and each has a forward-joining 90-degree elbow. The output ends of this set of vertical multistage centrifugal pumps are connected to an output pipe that is set along the width of the container and staggered in the height direction from the corresponding input pipe through a reversing pipe structure. The outlet ends of each output pipe are staggered in the width of the container and each has a forward-connecting 90-degree elbow. Each reversing pipe structure includes a U-shaped pipe that connects the input pipe on the input end of the corresponding vertical multistage centrifugal pump to the output end of the corresponding vertical multistage centrifugal pump, a first L-shaped pipe that connects to the U-shaped pipe through a first tee pipe located on the U-shaped pipe near the input end of the corresponding vertical multistage centrifugal pump, and a second L-shaped pipe that connects to the U-shaped pipe through a second tee pipe located on the U-shaped pipe near the output end of the corresponding vertical multistage centrifugal pump; Each U-shaped pipe is connected to the corresponding output pipe through the corresponding first L-shaped pipe and is staggered from the corresponding input pipe in the height direction. Each U-shaped pipe is connected to the common vent pipe through the corresponding second L-shaped pipe. The common vent pipe is arranged horizontally along the length of the container and has a normally closed discharge port at one end. Each input pipe is equipped with a first valve between the connection point of itself and the corresponding U-shaped pipe and the input end of the corresponding vertical multistage centrifugal pump. Each U-shaped pipe is equipped with a second valve between the corresponding first tee pipe and the corresponding input pipe. Each first L-shaped pipe is equipped with a third valve, and each second L-shaped pipe is equipped with a fourth valve.

7. The containerized water pretreatment BOP system for hydrogen production by water electrolysis as described in claim 6, characterized in that: The chemical addition pipeline is arranged vertically, with its lower end connected to the common drain pipe and its upper end connected to the scale inhibitor addition tank, the reducing agent addition tank, and the hydrochloric acid addition tank, respectively. In addition, except for the fourth valve on the second L-shaped pipe corresponding to the second inlet pump which is normally open, the other fourth valves are normally closed.

8. The containerized water pretreatment BOP system for hydrogen production by water electrolysis as described in claim 1, characterized in that: The disc tube reverse osmosis system is equipped with an internal circulation system with an internal circulation pump. The internal circulation system is configured as follows: the concentrate outlet of a set of disc tube reverse osmosis modules is split into a circulation pipeline and a discharge pipeline; the concentrate in the circulation pipeline is pressurized by the internal circulation pump and then merges with the inlet water from the outlet of the high-pressure pump on the inlet side of the disc tube reverse osmosis module, and together they enter the inlet of the set of disc tube reverse osmosis modules; the concentrate in the discharge pipeline flows to the DTRO concentrate tank; and the flow ratio between the circulation pipeline and the discharge pipeline is adjustable.

9. The containerized water pretreatment BOP system for hydrogen production by water electrolysis as described in claim 8, characterized in that: Also includes: Control system; A water quality sensor is installed in the disc tube reverse osmosis treatment loop to monitor the quality of the permeate water from the disc tube reverse osmosis system and is connected to the control system signal. The pipeline mixer is connected in series with the first auxiliary filter on the disc tube reverse osmosis treatment loop and adds chemical reagents to the water storage tank through the chemical addition pipeline in the pipeline system. The first regulating actuator, controlled by the control system, is used to regulate the flow ratio in the circulation pipeline and the discharge pipeline; The second regulating actuator, controlled by the control system, is used to regulate the amount of chemical agent added to the pipeline mixer through the chemical addition pipeline; The control system is configured as follows: (a) Receive real-time water quality data from the water quality sensor and compare it with the preset water quality target value; (b) When the real-time water quality data is worse than the water quality target value, an instruction is sent to the first regulating actuator to reduce the concentrate flow rate in the discharge pipeline, thereby increasing the concentrate flow rate ratio in the circulation pipeline to physically enhance the scouring of the membrane surface. (c) If, after performing step (b), the real-time water quality data fails to recover to the target water quality value within a preset time period, while maintaining the adjustment state of step (b), an instruction is issued to the second adjustment actuator to increase the dosage of one or more chemical agents to chemically assist in inhibiting membrane fouling until the real-time water quality data recovers to the target water quality value. (d) Once the real-time water quality data recovers to the target water quality value, an instruction is sent to the second regulating actuator to reduce the dosage of chemical agents until it recovers to the preset normal basic dosage level. Then, if the real-time water quality data can be stably maintained within the target water quality value range, an instruction is sent to the first regulating actuator to gradually restore the ratio of concentrated water flow in the circulation pipeline and the discharge pipeline to the normal operating state before step (b).

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