Seawater desalination boiler water supplementing system and method thereof

Abstract

The invention belongs to the technical field of seawater desalination and boiler water replenishing, and particularly relates to a seawater desalination boiler water replenishing system and a method thereof.The seawater desalination boiler water replenishing system mainly comprises a seawater taking pump connected with a condensation pipe bundle, the condensation pipe bundle is connected with a water inlet pipeline of a heat exchanger, and a water outlet pipeline of the heat exchanger is connected with a water inlet pipeline of an evaporation chamber; a water outlet pipeline of the evaporation chamber is connected with a water inlet pipeline of the boiler; seawater is evaporated by the evaporation chamber to form fresh water which is conveyed for supplementing water to the boiler; the lower end of the evaporation chamber is further connected with a concentrated water collecting pipe, the concentrated water collecting pipe is connected with a condensation pipe bundle, unevaporated seawater is recycled and enters a seawater desalination treatment process again, seawater desalination is directly combined with a boiler water supplementing system, the complexity of independent seawater desalination is reduced, waste heat in the thermal recovery process is effectively utilized, and the heat recovery efficiency is improved. The whole technological process is simplified, the overall efficiency of the system is improved, unevaporated seawater can flow back to the condensing tube bundle again for desalination treatment, the energy utilization rate is improved, and energy waste is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of seawater desalination and boiler water replenishment, and in particular relates to a seawater desalination boiler water replenishment system and a method thereof. Background Art

[0002] The recoverable reserves and production of conventional oil fields in Bohai Sea are decreasing year by year, but its super-heavy oil reserves are huge and have never been used. In order to make up for the decline in crude oil production, super-heavy oil thermal recovery has become the main measure and development direction for offshore oil and gas field development. The steam injection system is the core of thermal recovery. The gas injection system mainly includes the boiler feed water treatment system and the steam injection boiler. The water quality standard of the steam injection boiler inlet water is high, requiring oil-free, zero hardness and low-salinity feed water. Unqualified inlet water quality will cause boiler scaling and coil corrosion, increase maintenance work and even cause safety accidents. Therefore, a reliable boiler water treatment system plays a vital role in thermal recovery and is the key to the safe, continuous and stable operation of the steam injection system.

[0003] Traditional desalination and boiler water replenishment systems often involve multiple independent processing units, such as separate desalination devices, water storage units, and delivery pumps. The connection and coordination between these units requires a lot of manpower and material resources, which makes the entire process complicated and the management cost high. Early desalination technologies, especially thermal desalination (such as multi-stage flash evaporation) and membrane desalination (such as reverse osmosis), may increase energy consumption and increase water production costs due to low efficiency when treating high-salinity seawater or large-scale industrial applications. During continuous operation, due to incomplete pretreatment, improper maintenance of desalination units, or untimely water quality monitoring, the TDS (total dissolved solids) content of the output fresh water is prone to fluctuations, affecting the safety and efficiency of boiler operation, and even causing boiler scaling, corrosion and other problems. Therefore, in previous systems, the functions of each part are relatively independent, lacking effective integration and automated control, making it difficult to flexibly respond to changes in production demand, and unable to efficiently utilize thermal energy and water resources.

[0004] The "double membrane method" with ultrafiltration and reverse osmosis as the core is mature and is the mainstream process in this field and is widely used. However, this technology also has problems such as high oil content in this type of water, strict pretreatment requirements, easy fouling of the membrane, and high operating costs. Summary of the invention

[0005] The present invention provides a seawater desalination boiler water replenishment system and method thereof, so as to solve the technical problems existing in the prior art of complex seawater desalination and boiler water replenishment process, low fresh water production efficiency and unstable desalinated water quality.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: A seawater desalination boiler water replenishment system is characterized in that it includes a seawater desalination module and a boiler water replenishment module. The seawater desalination module includes a seawater condenser. The water inlet pipe of the seawater condenser is connected to a seawater water intake pump. The water outlet pipe of the seawater condenser is connected to a heat exchanger. The water outlet pipe of the heat exchanger is connected to the water inlet pipe of an evaporation chamber. A plurality of condenser tube bundles are connected to the seawater condenser. The condenser tube bundles are arranged in the evaporation chamber. Each condenser tube bundle corresponds to an evaporation chamber. A demister and a fresh water chamber are arranged in the evaporation chamber. The fresh water chamber is located directly below the condenser tube bundle. Fresh water generated in the evaporation chamber is collected in the fresh water chamber. The fresh water chamber is connected to the boiler water replenishment module to continuously replenish water for the boiler.

[0007] The evaporation chamber is connected to a vacuum system.

[0008] The lower ends of the evaporation chambers are connected to each other through a concentrated water collecting pipe, and the concentrated water collecting pipe is connected to a concentrated water recovery pipe and a concentrated water discharge pipe.

[0009] A salt concentration monitor is provided on the concentrate collection pipe, and the salt concentration monitor is connected to a control module. The control module receives in real time the seawater salt content data in the concentrate collection pipe monitored by the salt concentration monitor, and controls the unsalted seawater to flow to the concentrate recovery pipe or the concentrate discharge pipe according to the seawater salt content data.

[0010] A concentrate discharge valve is provided on the concentrate discharge pipe, and the concentrate discharge valve is connected to a control module. The control module controls the opening and closing of the concentrate discharge valve according to the seawater salinity data in the concentrate collection pipe.

[0011] The concentrate recovery pipe is connected to the seawater condensation pipe. A concentrate reflux valve and a concentrate reflux pump are provided on the concentrate recovery pipe. Both the concentrate reflux valve and the concentrate reflux pump are connected to the control module. The control module controls the opening and closing of the concentrate reflux valve and the start and stop of the concentrate reflux pump according to the seawater salinity data in the concentrate collection pipe.

[0012] The boiler water supply module includes a fresh water tank, the water inlet pipe of the fresh water tank is connected to the water outlet pipe of the fresh water chamber in the seawater desalination module, the water outlet pipe of the fresh water tank is connected to the boiler water supply pipe, the boiler water supply pipe is provided with a boiler water supply pump, the boiler water supply pump is connected to the control module, and the control module controls the start and stop of the boiler water supply pump according to the boiler load or whether maintenance is required.

[0013] The outlet pipe of the fresh water chamber is connected to the fresh water tank through a fresh water collecting pipe. A fresh water collecting pump is arranged on the fresh water collecting pipe. The fresh water collecting pump is connected to a control module. The control module controls the start and stop of the fresh water collecting pump and the seawater intake pump according to the liquid level data of the fresh water tank.

[0014] A fresh water tank level gauge is provided on the fresh water tank, and the fresh water tank level gauge is connected to the control module, and the control module receives the liquid level data of the fresh water tank monitored by the fresh water tank level gauge in real time.

[0015] A seawater desalination boiler water replenishment method, a seawater intake pump transports seawater to a heat exchanger through a seawater condenser tube, the seawater is heated by the heat exchanger and then transported to an evaporation chamber, the seawater evaporates in the evaporation chamber to generate seawater vapor, the seawater vapor passes through a demister to form fresh water vapor, the fresh water vapor condenses on the surface of a condenser tube bundle to form fresh water, the fresh water falls into the fresh water chamber, and the fresh water in the fresh water chamber is transported to a boiler water replenishment module to replenish the boiler.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention discloses a seawater desalination boiler water replenishment system, which directly combines seawater desalination with the boiler water replenishment system, not only reduces the complexity of independent seawater desalination, reduces the complexity of the boiler water replenishment process, but also improves the overall water production efficiency of the system. Through the integrated design, multiple links of seawater intake, evaporation, condensation and boiler water replenishment are integrated into a continuous process. Compared with the traditional separate seawater desalination and boiler water replenishment system, the operation steps are significantly simplified, and the energy loss and maintenance cost that may be caused by the intermediate links are reduced. After the seawater is absorbed, it is first cooled by the condensation tube bundle and then enters the heat exchanger for heating, which will accelerate the heat exchange efficiency of the heat exchanger and thus improve the fresh water production efficiency. The demister design in the evaporation chamber can effectively remove salt and other impurities in the seawater vapor, improve the stability of the desalinated water quality, provide a purer and more stable water source for the boiler, and reduce the equipment corrosion and maintenance cost caused by water quality problems. The fresh water directly produced by the evaporation chamber is used for boiler water replenishment, which avoids the water quality fluctuations that may be caused by multiple conversions in the traditional process, reduces the intermediate links, improves the overall efficiency of the system, and also ensures the continuity and stability of the fresh water supply.

[0017] Furthermore, the evaporation chamber in the system design is combined with the demister to treat grease and other suspended matter in seawater to a certain extent. The evaporation process itself helps to separate water and insoluble substances, including grease, while the demister can further remove tiny droplets in the steam, indirectly helping to reduce the grease content entering the subsequent links, reducing the dependence and pressure on the precision filtration membrane, and reducing the strict requirements for pretreatment.

[0018] Furthermore, the application of connecting the evaporation chamber to the vacuum system creates a low-pressure environment that is conducive to seawater evaporation, reduces the temperature required for seawater evaporation, improves the efficiency of seawater desalination, and also enhances the adaptability and operational reliability of the entire system, especially when dealing with high-salinity seawater.

[0019] Furthermore, the unevaporated seawater from multiple evaporation chambers is collected through a concentrate collection pipe, and the seawater is then processed into concentrate water or discharged, thereby achieving effective management and reuse of concentrate water. The recycled seawater is re-desalinated, which effectively improves the quality of fresh water. This not only improves the recycling rate of water resources, but also reduces environmental emission pressure.

[0020] Furthermore, the salt concentration monitoring and control system is integrated to monitor the salt content of the concentrate in real time and adjust the flow direction of the unevaporated seawater accordingly, ensuring the stability and quality of the fresh water produced by the system, avoiding the backflow of high-salinity water into the desalination process, and optimizing the desalination efficiency.

[0021] Furthermore, the concentrate discharge valve is integrated with the control module to realize automatic control of the discharge of unevaporated seawater. The discharge valve is automatically controlled based on the salt content data, which effectively manages the concentrate discharge and avoids unnecessary waste of resources, while also maintaining the normal working pressure of the system.

[0022] Furthermore, the setting of the concentrated water recovery pipe realizes the recycling mechanism for evaporated seawater. The insufficiently desalinated seawater flows back to the condenser for further treatment, which significantly improves the utilization efficiency of seawater, reduces the cost of fresh water production, and improves the economy of the entire system.

[0023] Furthermore, the concentrate reflux pump is integrated with the valve and control module, and is adjusted in real time according to the salinity of seawater in the concentrate collection pipe, thereby achieving effective recycling of unevaporated seawater. This not only avoids the negative impact of salt accumulation on the system, but also improves the recovery rate of fresh water resources, helps to maintain the stability of desalinated water quality, and reduces the burden on the environment. It further optimizes the concentrate treatment process, accurately controls the reflux volume and the working state of the reflux pump, and ensures the flexibility and efficiency of the system operation.

[0024] Furthermore, the boiler water supply pump is linked to the boiler status through the control module, and can automatically adjust the water supply frequency and water volume according to the actual needs of the boiler, avoiding excessive or insufficient water supply, ensuring the safety and efficiency of boiler operation, while optimizing energy consumption and reducing unnecessary waste of resources.

[0025] Furthermore, through the cooperation of the fresh water collection pump and the control module, the automatic start and stop of fresh water delivery to the fresh water tank can be achieved according to the real-time liquid level of the fresh water tank, which effectively prevents the fresh water tank from overflowing or the pump from idling, reduces manual intervention, improves the system's degree of automation, simplifies the operating process, and also ensures the rational collection and storage of fresh water resources.

[0026] Furthermore, the introduction of the fresh water tank level meter enables the system to monitor the storage status of the fresh water tank more accurately. Combined with the intelligent judgment of the control module, a more accurate control strategy for the fresh water collection pump is implemented, ensuring the effective management and utilization of fresh water resources, and further improving the stability and efficiency of the system operation.

[0027] Furthermore, the integrated application of the control module automatically adjusts the start and stop of pumps (such as fresh water collection pumps, boiler feed water pumps, and concentrate return pumps) and the opening and closing of valves (such as concentrate discharge valves) based on multiple data such as the fresh water tank level, boiler status, and concentrate salt concentration, thereby realizing automated management of the system, greatly reducing labor costs, optimizing the utilization efficiency of water resources, and reducing waste.

[0028] Furthermore, by precisely controlling the opening of the concentrate discharge valve and based on data feedback from the salt concentration monitor, it is ensured that concentrate is discharged only when necessary, thus reducing the impact on the marine environment and embodying the concept of environmental protection.

[0029] Furthermore, the present invention discloses a desalination boiler water replenishment method, which forms a coherent process by integrating the steps of seawater transportation, heating, evaporation, condensation and fresh water transportation to the boiler. Compared with the traditional decentralized treatment, it greatly simplifies the process flow of seawater desalination and boiler water replenishment, reduces the intermediate links, and reduces the system complexity and maintenance costs. The seawater is directly heated by a heat exchanger to accelerate the evaporation of seawater to form fresh water vapor. This process reduces energy loss and improves the utilization rate of thermal energy, so that the efficiency of fresh water preparation is significantly improved. The steam generated in the evaporation chamber passes through the demister to remove impurities, and then condenses into fresh water on the surface of the condenser tube bundle. This process helps to remove salt and other suspended matter in the water and improve the stability of the fresh water production quality.

[0030] Furthermore, the system uses the natural physical process of evaporation and condensation to desalinate seawater, rather than relying on technologies such as reverse osmosis membranes. This significantly reduces the use of membrane components, thereby avoiding the problem of membrane contamination and clogging, reducing the frequency and cost of membrane cleaning and replacement, and reducing long-term operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a flow chart of the desalination boiler water supply system; Figure 2 Schematic diagram of the control module of the desalination boiler water supply system.

[0032] Labels: 1. Seawater intake pump; 2. Heat exchanger; 3. Evaporation chamber; 4. Defogger; 5. Condensation tube bundle; 6. Fresh water chamber; 7. Fresh water collecting pipe; 8. Concentrated water collecting pipe; 9. Concentrated water discharge valve; 10. Concentrated water reflux valve; 11. Concentrated water reflux pump; 12. Fresh water tank; 13. Fresh water tank level gauge; 14. Boiler feed water pump; 15. Salt concentration monitor; 16. Fresh water collecting valve; 17. Vacuum system; 18. Control module; 19. Seawater condenser; 20. Concentrated water recovery pipe; 21. Concentrated water discharge pipe. DETAILED DESCRIPTION

[0033] In order to further understand the content of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it.

[0034] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0035] See also Figure 1 and Figure 2The seawater desalination boiler water supply system includes a seawater condenser 19, the water inlet pipe of the seawater condenser 19 is connected to the seawater water pump 1, the water outlet pipe of the seawater condenser 19 is connected to the water inlet pipe of the heat exchanger 2, the water outlet pipe of the heat exchanger 2 is connected to the water inlet pipe of the evaporation chamber 3, and the seawater condenser 19 is connected to a plurality of condenser tube bundles 5, which are arranged in the evaporation chamber 3, each condenser tube bundle 5 corresponds to an evaporation chamber 3, each evaporation chamber 3 is connected to the vacuum system 17, and the evaporation chamber 3 includes a demister 4 and a fresh water chamber 6, the fresh water chamber 6 is located directly below the condensation tube bundle 5 at the top of the evaporation chamber 3, the seawater vapor evaporated from the seawater in the evaporation chamber 3 is adsorbed and purified by the demister 4 to form fresh water vapor, the fresh water vapor is then condensed through the condensation tube bundle 5 to form fresh water, the condensed fresh water directly falls into the fresh water chamber 6 below, the outlet pipe at the lower end of the fresh water chamber 6 is connected to the fresh water collecting pipe 7, the fresh water collecting pipe 7 is connected to the water inlet pipe of the fresh water tank 12, the fresh water generated in the fresh water chamber 6 is transported to the fresh water tank 12 through the fresh water collecting pipe 7, and the fresh water The outlet pipe of the fresh water tank 12 is connected with the water supply pipe of the boiler, and the water supply pipe of the boiler is provided with a boiler water supply pump 14. The fresh water in the fresh water tank 12 is transported to the boiler through the boiler water supply pump 14 to replenish the boiler water. The number of evaporation chambers 3 is determined comprehensively according to specific needs. When multiple evaporation chambers 3 are required, the multiple evaporation chambers 3 are connected through the concentrated water collection pipe 8 at the bottom of the evaporation chamber 3. The concentrated water collection pipe 8 at the lower end of the evaporation chamber 3 is connected with a concentrated water recovery pipe 20 and a concentrated water discharge pipe 21. The concentrated water recovery pipe 20 is connected to the seawater condensation pipe 21. The inlet pipe of the pipe 19 is connected, and the concentrated water recovery pipe 20 is provided with a concentrated water return valve 10 and a concentrated water return pump 11. The unsalted seawater in the concentrated water collection pipe 8 can enter the seawater condensation pipe 19 again through the concentrated water return valve 10 and the concentrated water return pump 11 and then be desalinated again; the unsalted seawater in the concentrated water collection pipe 8 is transported to the concentrated water discharge pipe 21 through the concentrated water discharge valve 9 and then discharged into the sea; the fresh water collection pipe 7 is provided with a fresh water collection valve 16, and the concentrated water collection pipe 8 is provided with a salt concentration monitor 15, such as Figure 2 As shown, the salt concentration monitor 15 and the fresh water tank level meter 13 send the real-time monitored salt concentration data and the fresh water tank level data to the control module 18. The control module 18 controls the opening and closing of the concentrated water discharge valve 9 or the concentrated water return valve 10, the opening and closing of the fresh water collection valve 16, and the start and stop of the concentrated water return pump 11 according to the received data. At the same time, the control module 18 also controls the start and stop of the boiler feed water pump 14 according to the load and maintenance status of the boiler.

[0036] This embodiment provides a seawater desalination boiler water replenishment system and method thereof, and the specific implementation steps are as follows: The seawater intake pump 1 draws seawater from the sea. The seawater first passes through the condensation tube bundle 5 on the seawater condensation tube 19 for preliminary cooling. The cooled seawater enters the heat exchanger 2 through the condensation tube bundle 5 for heat exchange. The heat exchanger 2 uses the heat of the boiler tail flue to perform heat exchange with the cooled seawater, so that the seawater is heated, avoiding waste of resources and effectively achieving the effect of energy saving and consumption reduction. The seawater is heated by the heat exchanger 2 and then transported to the evaporation chamber 3. The evaporation chamber 3 is connected to a vacuum system 17. The vacuum system 17 extracts air or other gases inside the evaporation chamber 3 through mechanical or physical means (such as a vacuum pump), thereby greatly reducing the air pressure inside the evaporation chamber 3 to make it lower than the external atmospheric pressure, so that a negative pressure environment is formed inside the evaporation chamber 3. At this time, the pressure in the evaporation chamber 3 is lower than the saturated vapor pressure corresponding to the seawater. Therefore, the temperature of the heated seawater transported to the evaporation chamber 3 is higher than the boiling point temperature under the negative pressure condition in the evaporation chamber 3. The seawater will boil rapidly after entering the evaporation chamber 3, and the seawater boils and vaporizes to generate seawater vapor. The generated seawater vapor rises in the evaporation chamber 3 and passes through the demister 4 in the evaporation chamber 3 to remove the salt substances dissolved in the steam to form fresh water vapor. The desalinated fresh water vapor continues to float to the top of the evaporation chamber 3, and the steam covers the surface of the condensation tube bundle 5. The steam condenses on the surface of the condensation tube bundle 5 to generate fresh water, and the fresh water falls from the surface of the condensation tube bundle 5 into the fresh water chamber 6 directly below the condensation tube bundle 5; the outlet pipe of the fresh water chamber 6 is connected to the fresh water tank 12 through the fresh water collecting pipe 7, and the fresh water desalinated in the evaporation chamber 3 is transported to the fresh water tank 12 through the fresh water collecting pipe 7, and the fresh water tank 12 continuously replenishes water for the boiler.

[0037] During the process of seawater vaporization in the evaporation chamber 3, the temperature of the seawater at the bottom of the evaporation chamber 3 that has not yet been desalinated will gradually decrease. Therefore, while the seawater in the upper part of the evaporation chamber 3 is evaporating, the seawater in the lower part of the evaporation chamber 3 that has not been desalinated is transported to the next-stage evaporation chamber 3 through the concentrated water collection pipe 8 under the evaporation chamber 3. The pressure in the next-stage evaporation chamber 3 is lower than the pressure in the previous-stage evaporation chamber 3. The undesalinated seawater flows into the next-stage evaporation chamber 3 with lower pressure and continues to vaporize to form seawater vapor. While the seawater in the upper part of the next-stage evaporation chamber 3 is evaporating, the seawater in the lower part of the evaporation chamber 3 that has not yet been desalinated enters the next-stage evaporation chamber 3 through the concentrated water collection pipe 8 at the same time. In this way, the process is repeated through multiple stages of evaporation chambers 3. Evaporation, desalination and condensation can continuously generate desalinated water, and the multi-stage evaporation chamber 3 operates simultaneously, which effectively speeds up the water production efficiency of generating fresh water from seawater; the number n of the evaporation chamber 3 is comprehensively determined after calculation based on the steam temperature and the concentrated water recovery rate. After the seawater is desalinated by the multi-stage evaporation chamber 3, there is still undesalinated seawater in the last stage of the evaporation chamber 3. The undesalinated seawater is transported to the concentrated water discharge pipe 21 through the concentrated water collection pipe 8 under the last stage of the evaporation chamber 3, and discharged into the sea through the concentrated water discharge valve 9 on the concentrated water discharge pipe 21, or re-enters the condensation tube bundle 5 through the concentrated water collection pipe 8 through the concentrated water reflux valve 10 and the concentrated water reflux pump 11 on the concentrated water recovery pipe 20, and the seawater desalination process is carried out again.

[0038] The concentrated water collection pipe 8 is provided with a salt concentration monitor 15, which is connected to a control module 18. The control module 18 is provided with a threshold value of the salt content of seawater recovery. The salt concentration monitor 15 monitors the salt content of the unsalted seawater flowing into the concentrated water collection pipe 8 in real time. The salt concentration monitor 15 sends the real-time monitored salt content data of the unsalted seawater to the control module 18. After receiving the data, the control module 18 determines whether the unsalted seawater needs to be recovered and desalinated again. The control module 18 is also connected to the concentrated water discharge valve 9, the concentrated water return valve 10 and the concentrated water return pump 11. If the seawater salt content data is less than the seawater salt content threshold, the control module 18 controls the brine reflux valve 10 and the brine reflux pump 11 to open, at which time the brine discharge valve 9 is closed, and the seawater with a salt content less than the seawater salt content threshold is transported to the brine recovery pipe 20, re-enters the seawater condensation pipe 19 through the brine recovery pipe 20, and enters the seawater desalination process after being cooled by the condensation tube bundle 5 again; if the salt content data of the unsalted seawater is greater than or equal to the seawater salt content threshold, the control module 18 controls the brine discharge valve 9 to open, the brine reflux valve 10 and the brine reflux pump 11 to close, and the unsalted seawater with a salt content greater than or equal to the seawater salt content threshold is transported to the brine discharge pipe 21 through the brine discharge valve 9, and is discharged into the sea through the brine discharge pipe 21.

[0039] Preferably, a fresh water collecting valve 16 is provided on the outlet pipe of the fresh water collecting pipe 7, a fresh water tank level gauge 13 is provided on the fresh water tank 12, the fresh water tank level gauge 13 is connected to the control module 18, the fresh water tank level gauge 13 monitors the fresh water level data in the fresh water tank 12 in real time, and sends the fresh water level data to the control module 18, the control module 18 is provided with a fresh water level threshold of the fresh water tank 12, the control module 18 receives the fresh water level data and controls the fresh water production; the control module 18 is also connected to the fresh water collecting valve 16 and the seawater intake pump 1, if the fresh water If the water level data is greater than or equal to the fresh water level threshold, the control module 18 controls the seawater intake pump 1 to stop absorbing seawater. At the same time, the control module 18 controls the fresh water collecting valve 16 to close to ensure that the fresh water generated in the fresh water chamber 6 will not continue to be input into the fresh water tank 12; if the fresh water level data is less than the fresh water level threshold, the seawater intake pump 1 normally transports the seawater through the condensing tube bundle 5 to the heat exchanger 2 for the fresh water treatment process, and the fresh water collecting valve 16 is also opened, and the fresh water is transported to the fresh water tank 12 through the fresh water collecting pipe 7, and the fresh water tank 12 replenishes the boiler with water.

[0040] Further preferably, a boiler feed water pump 14 is provided on the feed water pipeline of the boiler, and the boiler feed water pump 14 is connected to the control module 18, and the control module 18 controls the start and stop of the boiler feed water pump 14 according to the boiler situation; if the boiler load decreases, the feed water amount needs to be reduced accordingly. At this time, the control module 18 controls to reduce the opening of the boiler feed water pump 14 to reduce the feed water amount; if the boiler needs to be overhauled, the control module 18 controls the boiler feed water pump 14 to stop, and the fresh water tank 12 stops supplying water to the boiler; if the fresh water tank 12 stops supplying water, the fresh water level in the fresh water tank 12 will gradually increase. When the fresh water level in the fresh water tank 12 is greater than or equal to the fresh water level threshold in the fresh water tank 12, the control module 18 controls the fresh water collection valve 16 to close, and controls the seawater intake pump 1 to stop, thereby controlling the system to stop water production.

[0041] Further preferably, if the boiler load increases, the boiler water replenishment amount needs to be increased accordingly. At this time, the control module 18 controls the seawater intake pump 1 and the concentrated water return pump 11 to increase the power, speed up their working efficiency and thus increase the water pumping volume. At the same time, the control module 18 also controls the fresh water collection valve 16 to increase its valve opening, increase the fresh water delivery volume from the fresh water collection pipe 7 to the fresh water tank 12, so as to increase the boiler water replenishment efficiency.

[0042] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A seawater desalination boiler water replenishment system, characterized in that: The invention comprises a seawater desalination module and a boiler water supply module. The seawater desalination module comprises a seawater condenser (19). The water inlet pipe of the seawater condenser (19) is connected to a seawater water intake pump (1). The water outlet pipe of the seawater condenser (19) is connected to a heat exchanger (2). The water outlet pipe of the heat exchanger (2) is connected to the water inlet pipe of an evaporation chamber (3). The seawater condenser (19) is connected to a plurality of condenser tube bundles (5). The condenser tube bundles (5) are arranged in the evaporation chamber (3). Each condenser tube bundle (5) corresponds to an evaporation chamber (3). A demister (4) and a fresh water chamber (6) are arranged in the evaporation chamber (3). The fresh water chamber (6) is located directly below the condenser tube bundle (5). Fresh water generated in the evaporation chamber (3) is collected in the fresh water chamber (6). The fresh water chamber (6) is connected to the boiler water supply module for supplying water to the boiler.

2. A seawater desalination boiler water replenishment system according to claim 1, characterized in that: The evaporation chamber (3) is connected to a vacuum extraction system (17).

3. A seawater desalination boiler water replenishment system according to claim 1, characterized in that: The lower ends of the plurality of evaporation chambers (3) are interconnected via a concentrated water collection pipe (8), and the concentrated water collection pipe (8) is connected to a concentrated water recovery pipe (20) and a concentrated water discharge pipe (21).

4. A seawater desalination boiler water replenishment system according to claim 3, characterized in that: A salt concentration monitor (15) is provided on the concentrated water collection pipe (8), and the salt concentration monitor (15) is connected to a control module (18). The control module (18) receives in real time data on the salt content of seawater in the concentrated water collection pipe (8) monitored by the salt concentration monitor (15), and controls the unsalted seawater to flow to the concentrated water recovery pipe (20) or the concentrated water discharge pipe (21) according to the seawater salt content data.

5. A seawater desalination boiler water replenishment system according to claim 4, characterized in that: A concentrated water discharge valve (9) is provided on the concentrated water discharge pipe (21), and the concentrated water discharge valve (9) is connected to a control module (18). The control module (18) controls the opening and closing of the concentrated water discharge valve (9) according to the salt content data of seawater in the concentrated water collection pipe (8).

6. A seawater desalination boiler water replenishment system according to claim 4, characterized in that: The concentrated water recovery pipe (20) is connected to the seawater condensation pipe (19). A concentrated water return valve (10) and a concentrated water return pump (11) are provided on the concentrated water recovery pipe (20). The concentrated water return valve (10) and the concentrated water return pump (11) are both connected to a control module (18). The control module (18) controls the opening and closing of the concentrated water return valve (10) and the starting and stopping of the concentrated water return pump (11) according to the seawater salt content data in the concentrated water collection pipe (8).

7. A seawater desalination boiler water replenishment system according to claim 1, characterized in that: The boiler water supply module comprises a fresh water tank (12), a water inlet pipe of the fresh water tank (12) is connected to a water outlet pipe of a fresh water chamber (6) in a seawater desalination module, the water outlet pipe of the fresh water tank (12) is connected to a water supply pipe of a boiler, a boiler water supply pipe is provided with a boiler water supply pump (14), the boiler water supply pump (14) is connected to a control module (18), and the control module (18) controls the start and stop of the boiler water supply pump (14) according to the boiler load or whether maintenance is required.

8. A seawater desalination boiler water replenishment system according to claim 7, characterized in that: The water outlet pipe of the fresh water chamber (6) is connected to the fresh water tank (12) via a fresh water collecting pipe (7). A fresh water collecting pump (16) is provided on the fresh water collecting pipe (7). The fresh water collecting pump (16) is connected to a control module (18). The control module controls the start and stop of the fresh water collecting pump (16) and the seawater intake pump (1) according to liquid level data of the fresh water tank (12).

9. A seawater desalination boiler water replenishment system according to claim 8, characterized in that: A fresh water tank liquid level gauge (13) is provided on the fresh water tank (12). The fresh water tank liquid level gauge (13) is connected to a control module (18). The control module (18) receives liquid level data of the fresh water tank (12) monitored by the fresh water tank liquid level gauge (13) in real time.

10. A method for replenishing water for a seawater desalination boiler, characterized in that: A seawater desalination boiler water replenishment system according to any one of claims 1 to 8, wherein the seawater desalination boiler water replenishment method is as follows: a seawater intake pump (1) transports seawater to a heat exchanger (2) through a seawater condenser (19); the seawater is heated by the heat exchanger (2) and then transported to an evaporation chamber (3); the seawater evaporates in the evaporation chamber (3) to generate seawater vapor; the seawater vapor passes through a demister (4) to form fresh water vapor; the fresh water vapor condenses on the surface of a condenser tube bundle (5) to form fresh water; the fresh water falls into a fresh water chamber (6); and the fresh water in the fresh water chamber (6) is transported to a boiler water replenishment module to replenish the boiler.

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