Auxiliary boiler water treatment device for reverse osmosis ship

Abstract

The invention discloses a reverse osmosis marine auxiliary boiler water treatment device, which comprises a reverse osmosis membrane group, an ultrafiltration membrane group, a water condensation cabinet, a high-pressure pump, a laminated filter, a flushing water pump and a backwashing water tank, the reverse osmosis membrane group and the ultrafiltration membrane group are used for treating tap water, the water condensation cabinet is used for collecting and storing condensed water discharged by a boiler, and the high-pressure pump is used for filtering the condensed water. The high-pressure pump is used for providing conveying power, and the laminated filter is used for filtering impurities in water. By arranging the reverse osmosis membrane set, the ultrafiltration membrane set, the water condensation cabinet, the high-pressure pump, the laminated filter, the flushing water pump and the backwashing water tank, the effect of treating water of the auxiliary boiler is achieved, through cooperation of the reverse osmosis membrane set, the ultrafiltration membrane set and the laminated filter, not only can condensate water be treated, but also tap water can be treated, and the water quality is improved. Therefore, high-quality fresh water can be produced, the requirement for safe operation of the boiler can be met, the defects caused by chemical dosing treatment can be avoided, and convenience is brought to water treatment work of the auxiliary boiler.

Description

Technical Field

[0001] The invention relates to the field of marine auxiliary boiler water treatment devices, in particular to a reverse osmosis marine auxiliary boiler water treatment device. Background Art

[0002] Ships consume a lot of steam every day. Auxiliary boilers are devices that provide steam for ships. They are mainly used to recycle the heat energy discharged by ship fuel or diesel engines to generate hot water or steam for heating the fuel system and lubricating oil system, as well as the living needs of crew members and passengers. The feed water of the auxiliary boiler mainly comes from the boiler water tank, enters the hot water well through the feed water pump, and is then transported to the boiler by the boiler feed water pump. In order to ensure the safe operation of the boiler and prevent problems such as boiler scaling, corrosion and steam-water co-boiling, it is necessary to treat the boiler water with drugs to control the hardness, alkalinity and salinity of the water to ensure the safe and economical operation of the boiler. In the operation of modern ships, auxiliary boilers, as an important part of the marine thermal energy system, are responsible for providing steam and hot water for ships. Auxiliary boilers are not only used to provide heating for the fuel system and lubricating oil system, but also provide hot water for crew members and passengers. In order to ensure the safe and stable operation of the boiler and avoid problems such as boiler scaling, corrosion, and low thermal efficiency caused by water quality problems, the feed water of the auxiliary boiler needs to undergo strict water quality treatment.

[0003] In actual operation, although the dosing water treatment method can control the operating indicators of water, the work of dosing treatment is relatively cumbersome, and the cost of the medicine is high. The water treatment agent also needs to be diluted with fresh water, which not only wastes the ship's fresh water resources, but also the agent bottle will cause pollution to the surrounding area, thus bringing inconvenience to the auxiliary boiler water treatment work. Summary of the invention

[0004] The purpose of the present invention is to provide a reverse osmosis marine auxiliary boiler water treatment device, which has the advantages of meeting the requirements for safe operation of the boiler and avoiding the disadvantages of drug administration, and solves the problems that the drug administration work is cumbersome and the cost of the drugs is high, and the water treatment chemicals also need to be diluted with fresh water, which not only wastes the fresh water resources of the ship, but also the chemicals bottles will cause pollution to the surrounding areas, thereby bringing inconvenience to the auxiliary boiler water treatment work.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a reverse osmosis marine auxiliary boiler water treatment device, comprising a reverse osmosis membrane group, an ultrafiltration membrane group, a condensate tank, a high-pressure pump, a laminated filter, a flushing water pump and a backwashing water tank, wherein the reverse osmosis membrane group and the ultrafiltration membrane group are used to treat tap water, the condensate tank is used to collect and store condensate discharged from the boiler, the high-pressure pump is used to provide conveying power, the laminated filter is used to filter impurities in the water, the flushing water pump and the backwashing water tank are used for backwashing, and the reverse osmosis membrane group, the ultrafiltration membrane group, the condensate tank, the high-pressure pump, the laminated filter, the flushing water pump and the backwashing water tank are all connected by pipelines, the water outlet of the ultrafiltration membrane group is connected to the water inlet of the reverse osmosis membrane group, the water outlet of the ultrafiltration membrane group is also connected to the hot water well pipeline, the pure water outlet of the reverse osmosis membrane group is connected to the hot water well pipeline, the water outlet of the laminated filter is connected to the inlet of the high-pressure pump, and the water outlet of the high-pressure pump is connected to the water inlet of the ultrafiltration membrane group.

[0006] Preferably, the inlet of the laminated filter is provided with a three-way solenoid valve, the outlet of the condensate tank is connected to the three-way solenoid valve, and the other end of the three-way solenoid valve is connected to a tap water inlet, the tap water inlet is used to provide water, and the other end of the tap water inlet is connected to the boiler water tank.

[0007] Preferably, the inlet of the condensate tank is connected to a condensate inlet, the other end of the condensate inlet is connected to a boiler condensate return pipe, and the condensate inlet is used to collect condensate.

[0008] Preferably, the concentrate outlet of the reverse osmosis membrane group is connected to an external water discharge outlet, and the external water discharge outlet is used to discharge the concentrate and backwash water.

[0009] Preferably, the pure water outlet of the reverse osmosis membrane group is connected to a pure water delivery pipe, and the other end of the pure water delivery pipe is connected to a hot water well pipeline.

[0010] Preferably, the surface of the backwash water tank is connected to a dosing port, and the dosing port is used to add a water treatment agent. The inner cavity of the backwash water tank can collect pure water and tap water.

[0011] Preferably, the reverse osmosis membrane group adopts CPA2-4040 reverse osmosis composite membrane, with a siltation index SDl15<5 and a turbidity<1.5NTU.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The present invention achieves the effect of treating auxiliary boiler water by arranging a reverse osmosis membrane group, an ultrafiltration membrane group, a condensate tank, a high-pressure pump, a laminated filter, a flushing water pump and a backwashing water tank. Through the cooperation of the reverse osmosis membrane group, the ultrafiltration membrane group and the laminated filter, not only the condensate but also the tap water can be treated, so that high-quality fresh water can be produced, which can meet the requirements for safe operation of the boiler and avoid the disadvantages brought by the dosing treatment, thus bringing convenience to the work of auxiliary boiler water treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the water treatment system flow of the present invention;

[0015] Figure 2 It is a schematic diagram of the water treatment process of the present invention;

[0016] Figure 3 It is a schematic diagram of the water system structure of the present invention.

[0017] In the figure: 1. Reverse osmosis membrane group; 2. Ultrafiltration membrane group; 3. Condensate tank; 4. High-pressure pump; 5. Laminated filter; 6. Flushing water pump; 7. Backwashing water tank; 8. Tap water inlet; 9. Dosing port; 10. External water outlet; 11. Pure water delivery pipe; 12. Condensate inlet. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] The reverse osmosis membrane group 1, ultrafiltration membrane group 2, condensate tank 3, high-pressure pump 4, laminated filter 5, flushing water pump 6, backwashing water tank 7, tap water inlet 8, dosing port 9, external water outlet 10, pure water delivery pipe 11 and condensate inlet 12 of the present invention are all universal standard parts or parts known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or through conventional experimental methods.

[0020] Example 1

[0021] like Figure 1-3As shown in the figure, it is the first embodiment of the present invention, which provides a reverse osmosis marine auxiliary boiler water treatment device, including a reverse osmosis membrane group 1, an ultrafiltration membrane group 2, a condensate tank 3, a high-pressure pump 4, a laminated filter 5, a flushing water pump 6 and a backwashing water tank 7. The reverse osmosis membrane group 1 and the ultrafiltration membrane group 2 are used to treat tap water, the condensate tank 3 is used to collect and store condensate discharged from the boiler, the high-pressure pump 4 is used to provide transmission power, the laminated filter 5 is used to filter impurities in the water, and the flushing water pump 6 and the backwashing water tank 7 are used to For backwashing, the reverse osmosis membrane group 1, the ultrafiltration membrane group 2, the condensate tank 3, the high-pressure pump 4, the laminated filter 5, the flushing water pump 6 and the backwashing water tank 7 are all connected by pipelines. The water outlet of the ultrafiltration membrane group 2 is connected with the water inlet of the reverse osmosis membrane group 1, and the water outlet of the ultrafiltration membrane group 2 is also connected with the hot water well pipeline. The pure water outlet of the reverse osmosis membrane group 1 is connected with the hot water well pipeline, the water outlet of the laminated filter 5 is connected with the inlet of the high-pressure pump 4, and the water outlet of the high-pressure pump 4 is connected with the water inlet of the ultrafiltration membrane group 2.

[0022] like Figure 1-3 As shown, the water entering the water treatment device is divided into two paths, one path is the collected condensate water, and the other path is the boiler water tank tap water. The water supply is switched by the electromagnetic three-way valve. The treated water is first pre-treated by the laminated filter 5. The laminated filter 5 can also be a security filter. The laminated filter 5 can filter the impurity particles in the water to prevent the particles from damaging the membranes of the reverse osmosis membrane group 1 and the ultrafiltration membrane group 2. The water filtered by the laminated filter 5 is transported to the ultrafiltration membrane group 2 by the high-pressure pump 4 for pre-treatment. The condensate water can be directly connected to the hot water inlet pipeline for use after being filtered by the laminated filter 5 and the ultrafiltration membrane group 2. Since the main pollutants in the condensate are oil molecules, they can be removed by the ultrafiltration membrane. The tap water needs to be filtered again by the reverse osmosis membrane group 1. The concentrated water generated after the filtration of the reverse osmosis membrane group 1 is discharged overboard, and the pure water is connected to the hot water inlet pipeline for use. Part of the pure water is also discharged to the inner cavity of the backwashing water tank 7. After mixing with the cleaning water treatment agent, the reverse osmosis membrane group 1 and the ultrafiltration membrane group 2 are backwashed by the flushing water pump 6.

[0023] The stacked filter is mainly used for preliminary filtration of particles and impurities in the water to prevent larger particles from damaging the subsequent membrane components (reverse osmosis membrane group and ultrafiltration membrane group). This pretreatment can effectively remove impurities such as suspended solids, sediment, rust, etc. in the water, protect the subsequent processing units, extend the service life of the membrane components, and improve the stability and processing efficiency of the system. The ultrafiltration membrane group is mainly used to further remove pollutants such as macromolecular organic matter, suspended matter, and oil molecules in the water. The ultrafiltration membrane can efficiently filter macromolecular pollutants (such as oil molecules and suspended matter) in the water, so that the condensate can be effectively purified through this membrane. The main pollutant in the condensate is oil. After being treated with the ultrafiltration membrane, the oil can be removed so that the water can reach the standard for direct use. For condensate with poor water quality, the water quality can be greatly improved by treating it with the ultrafiltration membrane.

[0024] Reverse osmosis membranes are mainly used to deeply purify water, remove pollutants such as dissolved salts, bacteria, viruses, etc. in water, and provide high-purity water. Reverse osmosis membranes can effectively remove dissolved salts (such as sodium, calcium, magnesium ions), dissolved organic matter, bacteria, viruses and other tiny impurities in water, and the resulting pure water can be directly used in hot water pipes. Especially for tap water, reverse osmosis membranes can improve the purity of water and meet higher requirements for application scenarios. High-pressure pumps are used to provide the required high water pressure to push water through the ultrafiltration membrane group and reverse osmosis membrane group to ensure the normal operation of the water treatment system. The high-pressure pump ensures that water can pass through the membrane system with sufficient pressure, thereby improving the separation efficiency of the membrane and the water treatment capacity.

[0025] The concentrated water generated during the filtration process of the reverse osmosis membrane group needs to be discharged to avoid water pollution or waste of resources. The concentrated water can be discharged overboard to ensure the continuous operation of the system, avoid the accumulation of concentrated water, and ensure the quality of the treated water. In addition, by discharging concentrated water, the concentrated water is prevented from having adverse effects on the internal environment of the system. The backwash water tank is used to store backwash water and cleaning water treatment agents. The membrane group is backwashed regularly to remove pollutants on the membrane surface and restore the membrane flux. Regular backwashing can remove dirt on the membrane surface and prevent the membrane pores from being blocked, thereby maintaining the efficient operation of the membrane and extending its service life. By mixing the cleaning water treatment agent, oil stains and other difficult-to-remove pollutants on the membrane surface can also be effectively removed.

[0026] According to the water quality and requirements of different water sources, the system can automatically switch to use condensate water or tap water for treatment. This design improves the flexibility and adaptability of the system, and can select the appropriate water source for treatment according to the specific situation. For example, condensate water mainly contains oil molecules, which can be effectively purified by ultrafiltration membrane, while tap water needs to be processed more finely by reverse osmosis membrane. The automatic switching system can improve the overall efficiency and ensure that the water quality meets the use requirements.

[0027] This embodiment removes larger particles through a laminated filter, reducing the burden on subsequent membrane treatment units, thereby improving the system's processing efficiency and saving energy and costs. The device adopts a multi-stage treatment process (laminated filtration, ultrafiltration membrane, reverse osmosis membrane), which can provide different levels of purification according to the water quality characteristics of different water sources to ensure that the water quality meets the use requirements. Through the backwashing and cleaning functions, the system can maintain long-term stable operation, reduce the pollution of the membrane group, and increase its service life. It can automatically switch the water supply path according to the different water sources (condensate or tap water), ensure the system's adaptability to different water qualities, and ensure efficient water treatment.

[0028] Example 2

[0029] Reference Figure 1-3 , which is the second embodiment of the present invention, and this embodiment is based on the previous embodiment.

[0030] In this embodiment, a three-way solenoid valve is provided at the inlet of the laminated filter 5, the outlet of the condensate tank 3 is connected to the three-way solenoid valve, and the other end of the three-way solenoid valve is connected to a tap water inlet 8, which is used to provide water, and the other end of the tap water inlet 8 is connected to the boiler water tank.

[0031] The inlet of the condensate tank 3 is connected to a condensate inlet 12 , and the other end of the condensate inlet 12 is connected to a boiler condensate return pipe. The condensate inlet 12 is used to collect condensate.

[0032] The concentrated water outlet of the reverse osmosis membrane group 1 is connected to an external water outlet 10, and the external water outlet 10 is used to discharge concentrated water and backwash water.

[0033] The pure water outlet of the reverse osmosis membrane group 1 is connected to a pure water delivery pipe 11, and the other end of the pure water delivery pipe 11 is connected to a hot water well pipeline.

[0034] The surface of the backwash water tank 7 is connected with a dosing port 9, which is used to add water treatment agents. The inner cavity of the backwash water tank 7 can collect pure water and tap water.

[0035] The reverse osmosis membrane group 1 adopts CPA2-4040 reverse osmosis composite membrane, with a siltation index SDl15<5 and a turbidity<1.5NTU.

[0036] like Figure 1-3As shown, the inner cavity of the condensate tank 3 is also provided with a liquid level sensor. When the liquid level is close to the high value, the tap water is cut off by the electromagnetic three-way valve, so that the water treatment device can process and use the condensate. When the water level drops to the low liquid level, the tap water circuit is opened, the condensate circuit is disconnected, and the water treatment device processes the water in the boiler water tank. Since the main pollutants in the condensate are oil molecules, they can be removed by the ultrafiltration membrane, and are directly connected to the hot water inlet pipeline for use after being filtered by the stacked filter 5 and the ultrafiltration membrane group 2. Backwash water can be prepared through the backwash water tank 7 and the dosing port 9, and the water treatment device is backwashed by the flushing water pump 6 to keep the treatment efficiency of the water treatment device.

[0037] When in use, the water entering the water treatment device is divided into two paths, one path is the collected condensate water, and the other path is the boiler water tank tap water. The water supply is switched by the electromagnetic three-way valve. The treated water is first pre-treated by the laminated filter 5. The laminated filter 5 can also be a security filter. The laminated filter 5 can filter the impurity particles in the water to prevent the particles from damaging the membranes of the reverse osmosis membrane group 1 and the ultrafiltration membrane group 2. The water filtered by the laminated filter 5 is transported to the ultrafiltration membrane group 2 by the high-pressure pump 4 for pre-treatment. The condensate water can be directly connected to the hot water inlet pipeline for use after being filtered by the laminated filter 5 and the ultrafiltration membrane group 2. Since the main pollutants in the condensate are oil molecules, they can be removed by the ultrafiltration membrane. The tap water needs to be filtered again by the reverse osmosis membrane group 1. The concentrated water generated after the filtration of the reverse osmosis membrane group 1 is discharged overboard, and the pure water is connected to the hot water inlet pipeline for use. Part of the pure water is also discharged to the inner cavity of the backwashing water tank 7. After mixing with the cleaning water treatment agent, the reverse osmosis membrane group 1 and the ultrafiltration membrane group 2 are backwashed by the flushing water pump 6.

[0038] This embodiment can improve the efficiency of water treatment. By combining reverse osmosis (RO) membrane, ultrafiltration (UF) membrane and laminated filter (security filter can also be used), multi-stage water treatment is achieved, which can effectively remove impurities, oil molecules, particulate matter and dissolved salts in water, ensuring that the output water quality meets the standards required for marine boilers. Hierarchical filtration and membrane technology (ultrafiltration and reverse osmosis membrane) can remove different types of pollutants. For example, ultrafiltration membrane can effectively remove oil, fine particles, and colloidal substances; reverse osmosis membrane can remove dissolved salts, heavy metals and other dissolved substances in water, providing high-purity water. Through such multi-stage filtration, water quality can be significantly improved, boiler scaling, corrosion and other problems can be reduced, and the service life of the boiler can be extended.

[0039] It can optimize resource utilization and water recycling. By collecting and processing the condensate (i.e. condensed water) discharged from the boiler, it can recycle water resources and reduce dependence on external water sources. After being treated by the ultrafiltration membrane, the condensate can be directly put into the hot water pipeline for use, reducing the amount of make-up water required for the boiler, thereby improving the utilization rate of water resources, especially during the navigation of the ship, which helps to save water resources and reduce operating costs. It can realize automatic and intelligent water level control. Through the linkage of the liquid level sensor and the electromagnetic three-way valve, it can realize automatic adjustment of the water level and switching of the water supply source, ensuring that the water treatment system is always in an efficient operating state. The introduction of the liquid level sensor can monitor the water level of the condensate tank in real time, ensuring that when the condensate is sufficient, it automatically switches to condensate water supply, reducing the use of tap water; when the condensate is insufficient, the system automatically switches to tap water supply, avoiding human operation errors and energy waste, and improving the automation and reliability of the system.

[0040] It has the backwashing function of the membrane assembly. By setting up a backwashing water tank and a backwashing water pump, the reverse osmosis membrane group and the ultrafiltration membrane group are backwashed regularly to maintain the cleanliness and treatment efficiency of the membrane. The backwashing function can effectively remove dirt and sediment on the membrane surface, avoid membrane pollution and blockage, thereby extending the service life of the membrane, reducing the replacement frequency and maintenance cost. At the same time, the cleaning agent used in the backwashing process can effectively remove pollutants on the membrane and maintain the long-term stable operation of the system. It can ensure water quality and improve the stability of long-term operation. Through the setting of the dosing port in the backwashing water tank, water treatment agents can be regularly added to the backwashing water tank to ensure the effect of cleaning water. By regularly using water treatment agents, the cleaning effect during the backwashing process can be improved, especially in the case of poor water quality, by effectively removing oil stains, minerals, etc. on the membrane surface, the stability and long-term operation efficiency of water treatment can be further improved.

[0041] With the advantages of strong adaptability and switching between multiple water sources, the water treatment device can automatically switch according to different water source conditions (condensate, tap water) to adapt to different water quality inputs. Through the three-way solenoid valve and water source switching mechanism, it can flexibly respond to different water source types and water quality conditions, ensuring that the water treatment system can work efficiently and stably in a variety of environments. It is an energy-saving and environmentally friendly design that reduces energy consumption and environmental pollution through efficient water treatment methods and energy recovery (such as condensate recycling, reuse of backwash water, etc.). Through efficient water treatment and membrane recovery strategies, the system not only reduces the demand for external water sources, but also achieves the goals of environmental protection and energy saving by reducing wastewater discharge and saving energy.

[0042] The water treatment device of the present invention has a strong water quality treatment capacity and can automatically switch according to the conditions of different water sources to ensure stable and efficient supply of required water quality. By optimizing water recycling, automatic control, backwash protection and water treatment efficiency, the device not only improves the operating efficiency of ship boilers, but also reduces resource consumption and operating costs, and has strong economy, environmental protection and long-term stability.

[0043] The standard parts used in this application document can all be purchased from the market and can be customized according to the description in the specification and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art. The control method is automatic control through a controller. The control circuit of the controller can be implemented through simple programming by technicians in this field, which is common knowledge in the field. This application is mainly used to protect mechanical devices, so this application no longer explains the control method and circuit connection in detail.

[0044] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A reverse osmosis marine auxiliary boiler water treatment device, comprising a reverse osmosis membrane group (1), an ultrafiltration membrane group (2), a condensate tank (3), a high-pressure pump (4), a laminated filter (5), a flushing water pump (6) and a backwashing water tank (7), characterized in that: The reverse osmosis membrane group (1) and the ultrafiltration membrane group (2) are used to process tap water, the condensate tank (3) is used to collect and store condensate discharged from the boiler, the high-pressure pump (4) is used to provide conveying power, the laminated filter (5) is used to filter impurities in the water, the flushing water pump (6) and the backwashing water tank (7) are used to perform backwashing, and the reverse osmosis membrane group (1), the ultrafiltration membrane group (2), the condensate tank (3), the high-pressure pump (4), the laminated filter (5), the flushing water pump (6) and the backwashing water tank (7) are all connected by pipelines, the water outlet of the ultrafiltration membrane group (2) is connected to the water inlet of the reverse osmosis membrane group (1), the water outlet of the ultrafiltration membrane group (2) is also connected to the hot water well pipeline, the pure water outlet of the reverse osmosis membrane group (1) is connected to the hot water well pipeline, the water outlet of the laminated filter (5) is connected to the inlet of the high-pressure pump (4), and the water outlet of the high-pressure pump (4) is connected to the water inlet of the ultrafiltration membrane group (2).

2. A reverse osmosis marine auxiliary boiler water treatment device according to claim 1, characterized in that: The inlet of the laminated filter (5) is provided with a three-way solenoid valve, the outlet of the condensate tank (3) is connected to the three-way solenoid valve, and the other end of the three-way solenoid valve is connected to a tap water inlet (8), the tap water inlet (8) is used to provide water, and the other end of the tap water inlet (8) is connected to the boiler water tank.

3. A reverse osmosis marine auxiliary boiler water treatment device according to claim 1, characterized in that: The inlet of the condensate tank (3) is connected to a condensate inlet (12), the other end of the condensate inlet (12) is connected to a boiler condensate return pipe, and the condensate inlet (12) is used to collect condensate.

4. A reverse osmosis marine auxiliary boiler water treatment device according to claim 1, characterized in that: The concentrated water outlet of the reverse osmosis membrane group (1) is connected to an external water discharge outlet (10), and the external water discharge outlet (10) is used to discharge concentrated water and backwash water.

5. A reverse osmosis marine auxiliary boiler water treatment device according to claim 1, characterized in that: The pure water outlet of the reverse osmosis membrane group (1) is connected to a pure water delivery pipe (11), and the other end of the pure water delivery pipe (11) is connected to a hot water well pipeline.

6. A reverse osmosis marine auxiliary boiler water treatment device according to claim 1, characterized in that: The surface of the backwash water tank (7) is connected to a dosing port (9), and the dosing port (9) is used to add a water treatment agent. The inner cavity of the backwash water tank (7) can collect pure water and tap water.

7. A reverse osmosis marine auxiliary boiler water treatment device according to claim 1, characterized in that: The reverse osmosis membrane group (1) adopts CPA2-4040 reverse osmosis composite membrane, with a siltation index SD115<5 and a turbidity<1.5NTU.

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