Marine synergy type steam jet refrigeration system

Abstract

The invention discloses a marine synergistic steam jet refrigeration system, which comprises a seawater desalination module, a medium circulation module and a steam jet module, and is characterized in that the seawater desalination module is used for converting sucked seawater into fresh water; the medium circulation module comprises a medium circulation shell, a water sprayer and a medium circulation loop, the medium circulation shell is provided with a buffer cavity and a heat exchange cavity which are not communicated with each other, the buffer cavity is communicated with the outlet end of the seawater desalination module and used for sucking converted fresh water, the water sprayer is communicated with the buffer cavity and the heat exchange cavity, and the heat exchange cavity is communicated with the medium circulation loop. And the medium circulation loop is used for spraying the fresh water in the buffer cavity into the heat exchange cavity and comprises a refrigeration part and a heat exchange part which are communicated with each other. The system has the beneficial effects that the main ejector and the auxiliary ejector are matched with each other, the main ejector can continuously extract steam from the heat exchange cavity, the gasification heat absorption speed of fresh water in the heat exchange cavity is guaranteed, the working efficiency of the refrigerating system is improved, and the refrigerating performance of the refrigerating system is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration systems, and particularly to a marine enhanced steam jet refrigeration system. Background Art

[0002] In modern ship operations, the refrigeration system is one of the key devices to ensure the normal operation of the ship and the living comfort of the crew. Multiple areas on the ship, such as the engine control room, crew living quarters, cargo refrigerated holds, etc., have specific requirements for refrigeration. Among them, the engine control room, as the core cabin for remote control of ship power equipment, monitoring of operation parameters, recording of fault alarms, and communication between the engine room and the bridge, the stable control of its environmental temperature is particularly important. Since the engine control room is usually located on the second deck of the engine room and is affected by factors such as high-temperature heat radiation during diesel engine operation and equipment heat dissipation, the engine room temperature can reach 41°C - 45°C during navigation. In such a high-temperature environment, not only will the work efficiency of the on-duty crew be reduced, but it may also affect the reliable operation of the electrical equipment in the engine control room. Therefore, an effective refrigeration system must be equipped for cooling.

[0003] From an energy perspective, ships consume a huge amount of energy, and most ships use fuel as the main energy source. Although two-stroke diesel engines with relatively high thermal efficiency are commonly used in ships currently, with a thermal efficiency of 48% - 51%, nearly half of the fuel energy is still converted into waste heat. Taking the diesel engine heat balance diagram in the data statistics of a certain ship as an example, the output work only accounts for 49.3% of the fuel energy, while the heat carried away by exhaust gas, supercharged air, and cylinder jacket cooling water respectively accounts for 25.5%, 16.5%, and 5.6% of the fuel energy. Among them, the exhaust gas waste heat temperature can reach about 300°C, containing a large amount of available thermal energy and having a high recovery value. If these waste heats can be effectively utilized in the refrigeration system, it can not only reduce the ship's dependence on external energy, but also improve the comprehensive energy utilization rate and reduce the operating cost.

[0004] Currently, the commonly used refrigeration system in the engine control room is a water-cooled independent air conditioner. This air conditioner is different from a household split air conditioner in structure. It integrates a compressor, an evaporator, a condenser, a throttling component, etc. and is installed inside the engine control room. In the actual use process, its disadvantages gradually emerge. First, it will generate relatively large noise during operation, interfering with the normal work and communication of the crew. Being in such an environment for a long time may also cause damage to the crew's hearing. Second, due to the small space and high environmental temperature in the engine control room, the maintenance work of this air conditioner becomes more difficult. It is inconvenient for maintenance personnel to operate, and the equipment has poor heat dissipation, further affecting its operation stability and service life. In addition, a conventional water-cooled independent air conditioner generally uses electric drive, unable to utilize a large amount of low-grade energy existing on the ship, such as diesel engine waste heat, resulting in energy waste and there is also a risk of refrigerant leakage.

[0005] The existing steam jet refrigeration system (such as a marine steam jet refrigeration system disclosed in the patent application No. 202010910785.1) is a refrigeration method that can utilize low-grade heat energy and has certain application prospects on ships. However, the entrainment efficiency of the steam ejector is still relatively low. Since the entrainment efficiency of the steam ejector directly affects the gasification heat absorption rate of the refrigerant water in the first heat exchanger, and thus determines the refrigeration performance of the refrigeration system. When the entrainment efficiency of the steam ejector is low, the gasification heat absorption rate of the refrigerant water in the first heat exchanger will decrease, resulting in a reduction in the working efficiency of the refrigeration system and poor refrigeration performance of the refrigeration system. Summary of the Invention

[0006] The purpose of the present invention is to overcome the above technical deficiencies and propose a marine enhanced steam jet refrigeration system to solve the technical problems in the prior art that the entrainment efficiency of the steam ejector is relatively low, resulting in a reduction in the working efficiency of the refrigeration system and poor refrigeration performance of the refrigeration system.

[0007] To achieve the above technical objectives, the technical solution of the present invention provides a marine enhanced steam jet refrigeration system, including: A seawater desalination module for converting the inhaled seawater into fresh water; A medium circulation module, which includes a medium circulation housing, a water sprayer, and a medium circulation loop. The medium circulation housing has a buffer chamber and a heat exchange chamber that are not connected to each other. The buffer chamber is connected to the outlet end of the seawater desalination module and is used to inhale the converted fresh water. The water sprayer connects the buffer chamber and the heat exchange chamber and is used to spray the fresh water in the buffer chamber into the heat exchange chamber. The medium circulation loop includes a refrigeration part and a heat exchange part that are connected to each other. The heat exchange part is arranged in the heat exchange chamber; A steam jet module, which includes a main ejector and a sub-ejector. The main ejector is used to extract the steam in the heat exchange chamber, and the sub-ejector is used to extract the steam in the buffer chamber.

[0008] Further, the seawater desalination module includes a seawater desalination unit, a fresh water storage tank, and a concentrated brine discharge unit. The seawater desalination unit is used to convert the inhaled seawater into fresh water and concentrated brine. The salt content of the concentrated brine is greater than that of seawater, and the salt content of seawater is greater than that of fresh water. The inlet end of the fresh water storage tank is connected to the first fresh water outlet end of the seawater desalination unit and is used to store fresh water. The buffer chamber is connected to the second fresh water outlet end of the seawater desalination unit and is used to inhale the converted fresh water. The inlet end of the concentrated brine discharge unit is connected to the concentrated brine outlet end of the seawater desalination unit and is used to discharge the concentrated brine.

[0009] Further, the seawater desalination unit includes a seawater desalination housing, a condenser, a heater, a seawater suction pump, a fresh water discharge pump, a salinometer, a first three-way valve, and a second three-way valve. The seawater desalination housing has a first condensation chamber and a second condensation chamber that are not connected to each other. The seawater desalination housing also has a heating chamber, and the heating chamber is communicated with the second condensation chamber. The condenser has a first part and a second part that are communicated with each other. The first part is located in the first condensation chamber, and the second part is located in the second condensation chamber. The second part is communicated with the heating chamber via a pipeline. The heater is located in the heating chamber, and it is used to heat the seawater in the heating chamber and vaporize the seawater. The outlet end of the seawater suction pump is communicated with the first part via a pipeline, and it is used to pump seawater into the heating chamber. The inlet end of the fresh water discharge pump is communicated with the fresh water outlet end of the second condensation chamber, and it is used to pump out the fresh water in the second condensation chamber. The inlet end of the salinometer is communicated with the outlet end of the fresh water discharge pump, and it is used to monitor the salinity of the fresh water. The inlet end of the first three-way valve is communicated with the outlet end of the salinometer. The first outlet end of the first three-way valve is communicated with the heating chamber via a pipeline. The inlet end of the second three-way valve is communicated with the second outlet end of the first three-way valve via a pipeline. The first outlet end of the second three-way valve is communicated with the inlet end of the fresh water storage tank via a pipeline. The second outlet end of the second three-way valve is communicated with the buffer chamber via a pipeline.

[0010] Further, the heater is of a coil structure. The inlet end of the heater is communicated with the outlet end of the diesel engine cylinder liner, and the outlet end of the heater is communicated with the inlet end of the diesel engine cylinder liner.

[0011] Further, the concentrated brine discharge unit includes a second valve, a third valve, a concentrated brine discharge pump, a fourth valve, and a fifth valve. The inlet end of the second valve is communicated with the concentrated brine outlet end of the condenser via a pipeline. The inlet end of the third valve is communicated with the concentrated brine outlet end of the second condensation chamber via a pipeline. The first inlet end of the concentrated brine discharge pump is communicated with the outlet end of the second valve via a pipeline. The second inlet end of the concentrated brine discharge pump is communicated with the outlet end of the third valve via a pipeline, and it is used to pump out the concentrated brine in the condenser and the second condensation chamber. The inlet end of the fourth valve is communicated with the outlet end of the concentrated brine discharge pump via a pipeline. The inlet end of the fifth valve is communicated with the outlet end of the fourth valve via a pipeline.

[0012] Further, the medium circulation loop further includes a medium circulation pump. The inlet end of the medium circulation pump is communicated with the outlet end of the heat exchange part via a pipeline. The outlet end of the medium circulation pump is communicated with the inlet end of the refrigeration part via a pipeline, and it is used to drive the medium to circulate in the medium circulation loop.

[0013] Further, the inlet end of the main ejector is communicated with the heat exchange chamber via a pipeline, and the outlet end of the main ejector is communicated with the first condensation chamber via a pipeline, which is used to drive steam to move from the heat exchange chamber to the first condensation chamber. The inlet end of the auxiliary ejector is communicated with the buffer chamber via a pipeline, and the outlet end of the auxiliary ejector is communicated with the first condensation chamber via a pipeline, which is used to drive steam to move from the buffer chamber to the first condensation chamber.

[0014] Further, the medium circulation module further includes a plurality of baffles, and each of the baffles is staggeredly arranged in the buffer chamber from bottom to top to form an S-shaped channel for steam to move upward in the buffer chamber. The inlet end of the water sprayer is communicated with the bottom of the buffer chamber, the second outlet end of the second three-way valve is communicated with the bottom of the buffer chamber via a pipeline, and the inlet end of the auxiliary ejector is communicated with the top of the buffer chamber.

[0015] Further, the steam injection module further includes an exhaust gas boiler, and the exhaust gas boiler is used to generate high-pressure superheated steam from the waste heat of diesel engine exhaust gas via the superheater inside it. The high-pressure superheated steam moves to the main ejector and the auxiliary ejector via pipelines respectively to drive the main ejector and the auxiliary ejector respectively.

[0016] Further, the steam injection module further includes a first jacket, a second jacket, a hot well, a condensate discharge pump and a boiler feed pump. The first jacket is coated on the pipeline where the inlet end of the main ejector is communicated with the heat exchange chamber, and a first cooling chamber is formed between the first jacket and the outer side wall of the corresponding pipeline. The second jacket is coated on the pipeline where the inlet end of the auxiliary ejector is communicated with the buffer chamber, and a second cooling chamber is formed between the second jacket and the outer side wall of the corresponding pipeline. Fresh water is stored in the hot well, and the inlet end of the hot well is communicated with the first cooling chamber and the second cooling chamber via pipelines respectively. The inlet end of the condensate discharge pump is communicated with the condensate outlet end of the first condensation chamber. The first outlet end of the condensate discharge pump is communicated with the inlet end of the first cooling chamber via a pipeline, which is used to pump the condensate in the first condensation chamber to the first cooling chamber. The second outlet end of the condensate discharge pump is communicated with the inlet end of the second cooling chamber via a pipeline, which is used to pump the condensate in the first condensation chamber to the second cooling chamber. The inlet end of the boiler feed pump is communicated with the outlet end of the hot well, and the outlet end of the boiler feed pump is communicated with the inlet end of the exhaust gas boiler, which is used to pump the fresh water in the hot well to the exhaust gas boiler.

[0017] Compared with the prior art, the beneficial effects of the present invention include: during use, the refrigeration part is arranged in the centralized control room. The seawater desalination module can suck in seawater and convert the sucked seawater into fresh water. The liquid medium in the refrigeration part absorbs the heat in the centralized control room and then turns into a gas. The gaseous medium enters the heat exchange part. Since the main ejector can extract the steam in the heat exchange cavity, the heat exchange cavity is in a low-pressure state. The water sprayer sprays the fresh water in the buffer cavity into the heat exchange cavity. The fresh water vaporizes and absorbs heat under low pressure in the heat exchange cavity, which can reduce the temperature of the medium and liquefy the gaseous medium. The liquefied medium flows back to the refrigeration part again to achieve cyclic refrigeration. Since the auxiliary ejector can extract the steam in the buffer cavity, the buffer cavity is near a vacuum state. The fresh water generated by the seawater desalination module is continuously sucked into the buffer cavity, ensuring that the main ejector can continuously extract the steam from the heat exchange cavity. In this marine enhanced steam jet refrigeration system, the main ejector and the auxiliary ejector cooperate with each other. The main ejector can continuously extract the steam from the heat exchange cavity, ensuring the vaporization and heat absorption speed of the fresh water in the heat exchange cavity, improving the working efficiency of the refrigeration system, and ensuring the refrigeration performance of the refrigeration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of a marine enhanced steam jet refrigeration system provided by the present invention; Figure 2 is a schematic structural diagram of the seawater desalination module provided by the present invention; Figure 3 is a schematic structural diagram of the medium circulation module provided by the present invention; Figure 4 is a schematic diagram of the refrigeration cycle principle provided by the present invention; In the figure: 100 - seawater desalination module, 110 - seawater desalination unit, 111 - seawater desalination housing, 1111 - second condensation chamber, 1112 - first condensation chamber, 1113 - heating chamber, 112 - condenser, 1121 - first part, 1122 - second part, 113 - heater, 114 - seawater suction pump, 115 - fresh water discharge pump, 116 - salinometer, 117 - first three-way valve, 118 - second three-way valve, 119 - first valve, 120 - fresh water storage tank, 130 - brine discharge unit, 131 - second valve, 132 - third valve, 133 - brine discharge pump, 134 - fourth valve, 135 - fifth valve, 200 - medium circulation module, 210 - medium circulation housing, 211 - buffer chamber, 212 - heat exchange chamber, 220 - sprinkler, 230 - medium circulation loop, 231 - refrigeration part, 232 - heat exchange part, 233 - medium circulation pump, 234 - sixth valve, 235 - seventh valve, 236 - eighth valve, 237 - expansion tank, 240 - baffle, 300 - steam injection module, 310 - main ejector, 320 - auxiliary ejector, 330 - exhaust gas boiler, 340 - first jacket, 350 - second jacket, 360 - hot well, 370 - condensate discharge pump, 380 - boiler feed pump, 390 - pressure regulating valve. Detailed implementation manners

[0019] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] The present invention provides a marine enhanced steam injection refrigeration system, the structure of which is as Figure 1 - Figure 3As shown in the figure, it includes a seawater desalination module 100, a medium circulation module 200 and a steam injection module 300. The seawater desalination module 100 is used to convert the inhaled seawater into fresh water. The medium circulation module 200 includes a medium circulation housing 210, a water sprayer 220 and a medium circulation loop 230. The medium circulation housing 210 has a buffer chamber 211 and a heat exchange chamber 212 that are not connected to each other. The buffer chamber 211 is connected to the outlet end of the seawater desalination module 100 and is used to inhale the converted fresh water. The water sprayer 220 connects the buffer chamber 211 and the heat exchange chamber 212 and is used to spray the fresh water in the buffer chamber 211 into the heat exchange chamber 212. The medium circulation loop 230 includes a refrigeration part 231 and a heat exchange part 232 that are connected to each other. The heat exchange part 232 is arranged in the heat exchange chamber 212. The steam injection module 300 includes a main injector 310 and a sub-injector 320. The main injector 310 is used to extract the steam in the heat exchange chamber 212, and the sub-injector 320 is used to extract the steam in the buffer chamber 211.

[0021] During use, the refrigeration part 231 is arranged in the centralized control room, and the heat exchange part 232 is arranged in the heat exchange chamber 212. The seawater desalination module 100 can inhale seawater and convert the inhaled seawater into fresh water. The medium in the medium circulation loop 230 reaches the refrigeration part 231. The liquid medium in the refrigeration part 231 absorbs the heat in the centralized control room and then turns into a gas. The gaseous medium enters the heat exchange part 232. Since the main injector 310 can extract the steam in the heat exchange chamber 212, the heat exchange chamber 212 is in a low-pressure state. The water sprayer 220 sprays the fresh water in the buffer chamber 211 into the heat exchange chamber 212. The fresh water vaporizes and absorbs heat under low pressure in the heat exchange chamber 212, which can reduce the temperature of the medium and liquefy the gaseous medium. The liquefied medium flows back to the refrigeration part 231 again to achieve cycle refrigeration. Since the sub-injector 320 can extract the steam in the buffer chamber 211, the buffer chamber 211 is close to a vacuum state. The fresh water generated by the seawater desalination module 100 is continuously inhaled into the buffer chamber 211, ensuring that the main injector 310 can continuously extract the steam from the heat exchange chamber 212. In this marine enhanced steam jet refrigeration system, the main injector 310 and the sub-injector 320 cooperate with each other. The main injector 310 can continuously extract the steam from the heat exchange chamber 212, ensuring the vaporization and heat absorption speed of the fresh water in the heat exchange chamber 212, improving the working efficiency of the refrigeration system, and ensuring the refrigeration performance of the refrigeration system.

[0022] As a preferred embodiment, please refer to Figure 1 and Figure 2, the seawater desalination module 100 includes a seawater desalination unit 110, a fresh water storage tank 120 and a brine discharge unit 130. The seawater desalination unit 110 is configured to convert the inhaled seawater into fresh water and brine. The salt content of the brine is greater than that of the seawater, and the salt content of the seawater is greater than that of the fresh water. The inlet end of the fresh water storage tank 120 is communicated with the first fresh water outlet end of the seawater desalination unit 110 for storing fresh water. The buffer chamber 211 is communicated with the second fresh water outlet end of the seawater desalination unit 110 for inhaling the converted fresh water. The inlet end of the brine discharge unit 130 is communicated with the brine outlet end of the seawater desalination unit 110 for discharging brine. When the cooling capacity requirement of the refrigeration unit 231 is not high, the excess fresh water generated by the seawater desalination unit 110 is stored in the fresh water storage tank 120 and can be used as domestic water. The brine discharge unit 130 can pump out the brine in the seawater desalination unit 110 to ensure the continuous and stable operation of the seawater desalination unit 110.

[0023] As a preferred embodiment, please refer to Figure 1 and Figure 2, the seawater desalination unit 110 includes a seawater desalination housing 111, a condenser 112, a heater 113, a seawater suction pump 114, a fresh water discharge pump 115, a salinometer 116, a first three-way valve 117 and a second three-way valve 118. The seawater desalination housing 111 has a first condensation chamber 1111 and a second condensation chamber 1112 that are not connected to each other. The seawater desalination housing 111 also has a heating chamber 1113, and the heating chamber 1113 is communicated with the second condensation chamber 1112. The condenser 112 has a first part 1121 and a second part 1122 that are communicated with each other. The first part 1121 is located in the first condensation chamber 1111, and the second part 1122 is located in the second condensation chamber 1112. The second part 1122 is communicated with the heating chamber 1113 via a pipeline. The heater 113 is located in the heating chamber 1113, and it is used to heat the seawater in the heating chamber 1113 and vaporize the seawater. The outlet end of the seawater suction pump 114 is communicated with the first part 1121 via a pipeline, and it is used to pump seawater into the heating chamber 1113. The inlet end of the fresh water discharge pump 115 is communicated with the fresh water outlet end of the second condensation chamber 1112, and it is used to pump out the fresh water in the second condensation chamber 1112. The inlet end of the salinometer 116 is communicated with the outlet end of the fresh water discharge pump 115, and it is used to monitor the salt content of the fresh water. The inlet end of the first three-way valve 117 is communicated with the outlet end of the salinometer 116. The first outlet end of the first three-way valve 117 is communicated with the heating chamber 1113 via a pipeline. The inlet end of the second three-way valve 118 is communicated with the second outlet end of the first three-way valve 117 via a pipeline. The first outlet end of the second three-way valve 118 is communicated with the inlet end of the fresh water storage tank 120 via a pipeline. The second outlet end of the second three-way valve 118 is communicated with the buffer chamber 211 via a pipeline. When fresh water needs to be produced, the seawater suction pump 114 is started. The seawater suction pump 114 can pump seawater into the heating chamber 1113. The heater 113 can heat the seawater in the heating chamber 1113 and vaporize the seawater. The steam enters the second condensation chamber 1112 and exchanges heat with the seawater in the second part 1122, and the steam is condensed into condensed water. The fresh water discharge pump 115 pumps out the water in the second condensation chamber 1112. During the process that the water passes through the salinometer 116, the salinometer 116 detects its salt content. If the salt content is lower than the preset value, it is fresh water. The fresh water continues to pass through the first three-way valve 117 and the second three-way valve 118 and then enters the buffer chamber 211. If the salt content is higher than the preset value, it is salt water. The salt water flows back into the heating chamber 1113 after passing through the first three-way valve 117 and is heated and condensed again, so as to avoid problems such as scaling and corrosion in the buffer chamber 211 and the heat exchange chamber 212 caused by water with a high salt content entering the buffer chamber 211 and the heat exchange chamber 212.

[0024] As a preferred embodiment, please refer to Figure 2 , the partition between the second condensation chamber 1112 and the first condensation chamber 1111 is used for heat insulation.

[0025] As a preferred embodiment, please refer to Figure 2 , the condenser 112 is an S-shaped tube structure. A part of the pipe fittings of the condenser 112 form the first part 1121, and another part of the pipe fittings of the condenser 112 form the second part 1122, so that the seawater flowing in the first part 1121 can exchange heat with the heated and vaporized steam, causing the steam to condense and liquefy. The relatively low temperature characteristic of seawater is directly utilized to condense and liquefy the steam, reducing energy consumption.

[0026] As a preferred embodiment, please refer to Figure 2 , the heater 113 is a coil structure. The inlet end of the heater 113 is communicated with the outlet end of the diesel engine cylinder liner, and the outlet end of the heater 113 is communicated with the inlet end of the diesel engine cylinder liner. The waste heat of the diesel engine cylinder liner cooling water is utilized for seawater desalination to achieve cascaded utilization of waste heat.

[0027] As a preferred embodiment, please refer to Figure 1 and Figure 2 , the seawater desalination unit 110 further includes a first valve 119. The inlet end of the first valve 119 is communicated with the second outlet end of the second three-way valve 118 via a pipeline, and the outlet end of the first valve 119 is communicated with the buffer chamber 211 via a pipeline. The on-off of the pipeline can be controlled through the first valve 119. When the salinity exceeds the standard, the supply of refrigerant water is immediately cut off.

[0028] As a preferred embodiment, please refer to Figure 2, the concentrated brine discharge unit 130 includes a second valve 131, a third valve 132, a concentrated brine discharge pump 133, a fourth valve 134 and a fifth valve 135. The inlet end of the second valve 131 is connected to the concentrated brine outlet end of the condenser 112 via a pipeline. The inlet end of the third valve 132 is connected to the concentrated brine outlet end of the second condensation chamber 1112 via a pipeline. The first inlet end of the concentrated brine discharge pump 133 is connected to the outlet end of the second valve 131 via a pipeline. The second inlet end of the concentrated brine discharge pump 133 is connected to the outlet end of the third valve 132 via a pipeline. It is used to pump out the concentrated brine in the condenser 112 and the second condensation chamber 1112. The inlet end of the fourth valve 134 is connected to the outlet end of the concentrated brine discharge pump 133 via a pipeline. When it is necessary to discharge the concentrated brine in the condenser 112 and the second condensation chamber 1112, the concentrated brine discharge pump 133 is started, and the concentrated brine discharge pump 133 will pump out the concentrated brine in the condenser 112 and the second condensation chamber 1112 to ensure that the seawater desalination unit 110 can operate continuously and stably.

[0029] As a preferred embodiment, please refer to Figure 3 , the sprinkler 220 is a booster pump.

[0030] As a preferred embodiment, the refrigeration unit 231 is a two-source air conditioner.

[0031] As a preferred embodiment, please refer to Figure 1 and Figure 3 , the medium circulation loop 230 further includes a medium circulation pump 233. The inlet end of the medium circulation pump 233 is connected to the outlet end of the heat exchange unit 232 via a pipeline. The outlet end of the medium circulation pump 233 is connected to the inlet end of the refrigeration unit 231 via a pipeline. It is used to drive the medium to circulate in the medium circulation loop 230. Through the suction action of the medium circulation pump 233, the medium can circulate in the medium circulation loop 230, thereby realizing cycle refrigeration.

[0032] As a preferred embodiment, please refer to Figure 1 and Figure 3, the medium circulation loop 230 further includes a sixth valve 234, a seventh valve 235, and an eighth valve 236. The inlet end of the sixth valve 234 is communicated with the outlet end of the heat exchange part 232 through a pipeline. The outlet end of the sixth valve 234 is communicated with the inlet end of the medium circulation pump 233 through a pipeline. The inlet end of the seventh valve 235 is communicated with the outlet end of the medium circulation pump 233 through a pipeline. The outlet end of the seventh valve 235 is communicated with the inlet end of the refrigeration part 231 through a pipeline. The inlet end of the eighth valve 236 is communicated with the outlet end of the refrigeration part 231 through a pipeline. The outlet end of the eighth valve 236 is communicated with the inlet end of the heat exchange part 232 through a pipeline. The on-off of the pipeline can be controlled by the sixth valve 234, the seventh valve 235, and the eighth valve 236.

[0033] As a preferred embodiment, please refer to Figure 1 and Figure 3 , the medium circulation loop 230 further includes an expansion tank 237. The inlet end of the expansion tank 237 is communicated with the outlet end of the sixth valve 234 through a pipeline. The expansion tank 237 is used to maintain the stable operation of the refrigeration system.

[0034] As a preferred embodiment, please refer to Figure 1 and Figure 3 , the inlet end of the main ejector 310 is communicated with the heat exchange chamber 212 through a pipeline. The outlet end of the main ejector 310 is communicated with the first condensation chamber 1111 through a pipeline. It is used to drive steam to move from the heat exchange chamber 212 to the first condensation chamber 1111. The inlet end of the auxiliary ejector 320 is communicated with the buffer chamber 211 through a pipeline. The outlet end of the auxiliary ejector 320 is communicated with the first condensation chamber 1111 through a pipeline. It is used to drive steam to move from the buffer chamber 211 to the first condensation chamber 1111. Since the utilization of secondary steam in the existing steam jet refrigeration system is still insufficient and the forms of secondary steam utilization are still few, in the steam jet refrigeration system, the secondary steam still contains a large amount of waste heat, which is directly discharged into the environment, causing energy waste. In this marine efficiency-enhanced steam jet refrigeration system, the secondary steam after being ejected by the main ejector 310 and the auxiliary ejector 320 is used to preheat the feed seawater, improving the working efficiency of the seawater desalination unit 110.

[0035] As a preferred embodiment, please refer to Figure 1 and Figure 2, the medium circulation module 200 further includes a plurality of baffles 240, and each of the baffles 240 is arranged staggeredly from bottom to top in the buffer chamber 211 to form an S-shaped channel for steam to move from bottom to top in the buffer chamber 211. The inlet end of the water sprayer 220 is communicated with the bottom of the buffer chamber 211, the second outlet end of the second three-way valve 118 is communicated with the bottom of the buffer chamber 211 via a pipeline, and the inlet end of the sub-injector 320 is communicated with the top of the buffer chamber 211. By changing the liquid flow path, the trapezoidal baffle can reduce the phenomenon of steam entraining liquid and ensure more thorough separation of liquid and steam during the flashing process.

[0036] As a preferred embodiment, please refer to Figure 1 , the steam injection module 300 further includes an exhaust gas boiler 330. The exhaust gas boiler 330 uses the superheater inside it to generate high-pressure superheated steam from the waste heat of the diesel engine exhaust gas. The high-pressure superheated steam moves to the main injector 310 and the sub-injector 320 via pipelines respectively to drive the main injector 310 and the sub-injector 320 respectively. In this marine efficiency-enhanced steam injection refrigeration system, the steam of the exhaust gas boiler 330 is used to drive the main injector 310 and the sub-injector 320 to achieve efficient utilization of waste heat and reduce power consumption. The fresh water produced by the seawater desalination unit 110 is used as the refrigerant water. The seawater desalination unit 110 is outside the centralized control room. Due to the absence of the influence of the indoor compressor, the noise in the centralized control room is reduced, and the working environment of the crew is improved.

[0037] As a preferred embodiment, please refer to Figure 1, the steam injection module 300 further includes a first jacket 340, a second jacket 350, a hot well 360, a condensate discharge pump 370, and a boiler feed pump 380. The first jacket 340 is disposed around the pipeline where the inlet end of the main ejector 310 communicates with the heat exchange chamber 212. A first cooling chamber is formed between the first jacket 340 and the outer sidewall of the corresponding pipeline. The second jacket 350 is disposed around the pipeline where the inlet end of the sub-ejector 320 communicates with the buffer chamber 211. A second cooling chamber is formed between the second jacket 350 and the outer sidewall of the corresponding pipeline. Fresh water is stored in the hot well 360. The inlet end of the hot well 360 is respectively communicated with the first cooling chamber and the second cooling chamber via pipelines. The inlet end of the condensate discharge pump 370 is communicated with the condensate outlet end of the first condensate chamber 1111. The first outlet end of the condensate discharge pump 370 is communicated with the inlet end of the first cooling chamber via a pipeline, and it is used to pump the condensate in the first condensate chamber 1111 into the first cooling chamber. The second outlet end of the condensate discharge pump 370 is communicated with the inlet end of the second cooling chamber via a pipeline, and it is used to pump the condensate in the first condensate chamber 1111 into the second cooling chamber. The inlet end of the boiler feed pump 380 is communicated with the outlet end of the hot well 360, and the outlet end of the boiler feed pump 380 is communicated with the inlet end of the exhaust gas boiler 330. It is used to pump the fresh water in the hot well 360 into the exhaust gas boiler 330. The condensate discharge pump 370 pumps the fresh water in the first condensate chamber 1111 into the first cooling chamber formed between the first jacket 340 and the outer sidewall of the corresponding pipeline and the second cooling chamber formed between the second jacket 350 and the outer sidewall of the corresponding pipeline respectively. By circulating the condensed fresh water in the jacket, the heat generated in the heat exchange chamber 212 is taken away through heat exchange, and the heat generated in the buffer chamber 211 is taken away through heat exchange, achieving efficient cooling, reducing the dependence on additional cooling equipment, reducing power consumption, improving the working environment. The boiler feed pump 380 pumps the fresh water in the hot well 360 into the exhaust gas boiler 330 to realize the recycling of fresh water.

[0038] As a preferred embodiment, please refer to Figure 1 , the steam injection module 300 further includes a pressure regulating valve 390. The inlet end of the pressure regulating valve 390 is communicated with the outlet end of the main ejector 310 via a pipeline, and the outlet end of the pressure regulating valve 390 is communicated with the first condensate chamber 1111 via a pipeline, which is used to regulate the pressure in the pipeline to ensure the normal operation of the system.

[0039] To better understand the present invention, the working principle of the technical solution of the present invention will be described in detail below in combination with Figure 1 - Figure 4 :During use, the refrigeration unit 231 is arranged in the centralized control room, and the heat exchange unit 232 is arranged in the heat exchange chamber 212. The seawater suction pump 114 can pump seawater into the heating chamber 1113. The seawater in the heating chamber 1113 can be heated by the heater 113 and vaporized. The steam enters the second condensation chamber 1112 and undergoes heat exchange with the seawater in the second part 1122. The steam is condensed into condensed water. The fresh water discharge pump 115 pumps out the water in the second condensation chamber 1112. During the process of the water passing through the salinometer 116, its salinity will be detected by the salinometer 116. If the salinity is lower than the preset value, it is fresh water, and the fresh water continues to enter the buffer chamber 211 after passing through the first three-way valve 117 and the second three-way valve 118. If the salinity is higher than the preset value, it is brine, and the brine flows back into the heating chamber 1113 after passing through the first three-way valve 117 and is heated and condensed again, avoiding problems such as scaling and corrosion in the buffer chamber 211 and the heat exchange chamber 212 caused by water with a high salt content entering the buffer chamber 211 and the heat exchange chamber 212. The medium in the medium circulation loop 230 reaches the refrigeration unit 231. The liquid medium in the refrigeration unit 231 absorbs the heat in the centralized control room and turns into a gas state. The gaseous medium enters the heat exchange unit 232. Since the main ejector 310 can extract the steam in the heat exchange chamber 212, making the heat exchange chamber 212 in a low-pressure state, the water sprayer 220 sprays the fresh water in the buffer chamber 211 into the heat exchange chamber 212. The fresh water vaporizes and absorbs heat under low pressure in the heat exchange chamber 212, which can reduce the temperature of the medium and liquefy the gaseous medium. The liquefied medium flows back to the refrigeration unit 231 again to achieve cycle refrigeration. Since the auxiliary ejector 320 can extract the steam in the buffer chamber 211, making the buffer chamber 211 near a vacuum state, the fresh water generated by the seawater desalination module 100 is continuously sucked into the buffer chamber 211, ensuring that the main ejector 310 can continuously extract steam from the heat exchange chamber 212. The main ejector 310 drives the steam to move from the heat exchange chamber 212 to the first condensation chamber 1111, and the auxiliary ejector 320 drives the steam to move from the buffer chamber 211 to the first condensation chamber 1111. The secondary steam after the injection of the main ejector 310 and the auxiliary ejector 320 is used to preheat the feed seawater, reducing the energy consumption of the seawater desalination unit 110 and saving energy. The condensed water discharge pump 370 pumps the fresh water in the first condensation chamber 1111 into the first cooling chamber formed between the first jacket 340 and the outer side wall of the corresponding pipeline and the second cooling chamber formed between the second jacket 350 and the outer side wall of the corresponding pipeline respectively. The condensed fresh water circulates in the jacket, and the heat generated in the heat exchange chamber 212 is taken away through heat exchange, and the heat generated in the buffer chamber 211 is taken away through heat exchange to achieve efficient cooling.Reduce the dependence on additional cooling equipment, lower power consumption, and improve the working environment. In this marine enhanced steam jet refrigeration system, the main ejector 310 and the auxiliary ejector 320 cooperate with each other. The main ejector 310 can continuously extract steam from the heat exchange chamber 212, ensuring the vaporization heat absorption rate of fresh water in the heat exchange chamber 212, improving the working efficiency of the refrigeration system, and ensuring the refrigeration performance of the refrigeration system.

[0040] The marine enhanced steam jet refrigeration system provided by the present invention has the following beneficial effects: (1) In this marine enhanced steam jet refrigeration system, the steam of the exhaust gas boiler 330 is used to drive the main ejector 310 and the auxiliary ejector 320, and the waste heat of the diesel engine cylinder jacket cooling water is used for seawater desalination, realizing cascaded utilization of waste heat, achieving efficient utilization of waste heat, reducing power consumption; (2) In this marine enhanced steam jet refrigeration system, the fresh water produced by the seawater desalination unit 110 is used as refrigerant water, realizing resource recycling, reducing fresh water consumption, and at the same time avoiding pollution of the ocean by chemical refrigerant water. The seawater desalination unit 110 is far from the centralized control room, reducing the noise in the centralized control room and improving the working environment of the crew; (3) In this marine enhanced steam jet refrigeration system, the secondary steam after the main ejector 310 and the auxiliary ejector 320 are ejected is used to preheat the feed seawater, reducing the energy consumption of the seawater desalination unit 110, saving energy. The condensed fresh water circulates in the jacket, and the heat generated in the heat exchange chamber 212 and the heat generated in the buffer chamber 211 are taken away through heat exchange, realizing efficient cooling, reducing the dependence on additional cooling equipment, lowering power consumption, and improving the working environment; (4) In this marine enhanced steam jet refrigeration system, the salinity meter 116 is used to detect the salinity of the water produced by the seawater desalination unit 110. If the salinity is lower than the preset value, it is fresh water, and the fresh water continues to enter the buffer chamber 211 after passing through the first three-way valve 117 and the second three-way valve 118. If the salinity is higher than the preset value, it is brine, and the brine flows back into the heating chamber 1113 after passing through the first three-way valve 117 and is reheated and condensed again, avoiding problems such as scaling and corrosion in the buffer chamber 211 and the heat exchange chamber 212 caused by water with a high salt content entering the buffer chamber 211 and the heat exchange chamber 212; (5) In this marine enhanced steam jet refrigeration system, the main ejector 310 and the auxiliary ejector 320 cooperate with each other. The main ejector 310 can continuously extract steam from the heat exchange chamber 212, ensuring the vaporization heat absorption rate of fresh water in the heat exchange chamber 212, improving the working efficiency of the refrigeration system, and ensuring the refrigeration performance of the refrigeration system.

[0041] The specific embodiments of the present invention described above do not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and deformations made according to the technical concept of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A marine enhanced steam jet refrigeration system, characterized in that, Comprising: A seawater desalination module for converting the inhaled seawater into fresh water; A medium circulation module including a medium circulation housing, a water sprayer and a medium circulation loop. The medium circulation housing has a buffer chamber and a heat exchange chamber that are not connected to each other. The buffer chamber is connected to the outlet end of the seawater desalination module and is used for inhaling the converted fresh water. The water sprayer connects the buffer chamber and the heat exchange chamber and is used for spraying the fresh water in the buffer chamber into the heat exchange chamber. The medium circulation loop includes a refrigeration part and a heat exchange part that are connected to each other. The heat exchange part is arranged in the heat exchange chamber; A steam injection module including a main injector and a sub-injector. The main injector is used for extracting the steam in the heat exchange chamber, and the sub-injector is used for extracting the steam in the buffer chamber.

2. The marine efficiency-enhanced steam jet refrigeration system according to claim 1, characterized in that, The seawater desalination module includes a seawater desalination unit, a fresh water storage tank and a concentrated brine discharge unit. The seawater desalination unit is used for converting the inhaled seawater into fresh water and concentrated brine. The salt content of the concentrated brine is greater than that of the seawater, and the salt content of the seawater is greater than that of the fresh water. The inlet end of the fresh water storage tank is connected to the first fresh water outlet end of the seawater desalination unit for storing fresh water. The buffer chamber is connected to the second fresh water outlet end of the seawater desalination unit for inhaling the converted fresh water. The inlet end of the concentrated brine discharge unit is connected to the concentrated brine outlet end of the seawater desalination unit for discharging the concentrated brine.

3. The marine efficiency-enhanced steam jet refrigeration system according to claim 2, wherein The seawater desalination unit includes a seawater desalination housing, a condenser, a heater, a seawater suction pump, a fresh water discharge pump, a salinity meter, a first three-way valve and a second three-way valve. The seawater desalination housing has a first condensation chamber and a second condensation chamber that are not connected to each other. The seawater desalination housing also has a heating chamber that is connected to the second condensation chamber. The condenser has a first part and a second part that are connected to each other. The first part is located in the first condensation chamber, and the second part is located in the second condensation chamber. The second part is connected to the heating chamber via a pipeline. The heater is located in the heating chamber and is used for heating the seawater in the heating chamber and vaporizing the seawater. The outlet end of the seawater suction pump is connected to the first part via a pipeline and is used for pumping the seawater into the heating chamber. The inlet end of the fresh water discharge pump is connected to the fresh water outlet end of the second condensation chamber and is used for pumping out the fresh water in the second condensation chamber. The inlet end of the salinity meter is connected to the outlet end of the fresh water discharge pump and is used for monitoring the salt content of the fresh water. The inlet end of the first three-way valve is connected to the outlet end of the salinity meter. The first outlet end of the first three-way valve is connected to the heating chamber via a pipeline. The inlet end of the second three-way valve is connected to the second outlet end of the first three-way valve via a pipeline. The first outlet end of the second three-way valve is connected to the inlet end of the fresh water storage tank via a pipeline. The second outlet end of the second three-way valve is connected to the buffer chamber via a pipeline.

4. The marine efficiency-enhanced steam jet refrigeration system according to claim 3, wherein, The heater is of a coil structure. The inlet end of the heater is connected to the outlet end of the diesel engine cylinder liner, and the outlet end of the heater is connected to the inlet end of the diesel engine cylinder liner.

5. The marine efficiency-enhanced steam jet refrigeration system according to claim 3, wherein, The concentrated brine discharge unit includes a second valve, a third valve, a concentrated brine discharge pump, a fourth valve and a fifth valve. The inlet end of the second valve is communicated with the concentrated brine outlet end of the condenser through a pipeline. The inlet end of the third valve is communicated with the concentrated brine outlet end of the second condensation chamber through a pipeline. The first inlet end of the concentrated brine discharge pump is communicated with the outlet end of the second valve through a pipeline. The second inlet end of the concentrated brine discharge pump is communicated with the outlet end of the third valve through a pipeline, and it is used to pump out the concentrated brine in the condenser and the second condensation chamber. The inlet end of the fourth valve is communicated with the outlet end of the concentrated brine discharge pump through a pipeline. The inlet end of the fifth valve is communicated with the outlet end of the fourth valve through a pipeline.

6. The marine efficiency-enhanced steam jet refrigeration system according to claim 1, wherein The medium circulation loop further includes a medium circulation pump. The inlet end of the medium circulation pump is communicated with the outlet end of the heat exchange part through a pipeline. The outlet end of the medium circulation pump is communicated with the inlet end of the refrigeration part through a pipeline, and it is used to drive the medium to circulate in the medium circulation loop.

7. The marine efficiency-enhanced steam jet refrigeration system according to claim 3, wherein, The inlet end of the main ejector is communicated with the heat exchange chamber through a pipeline. The outlet end of the main ejector is communicated with the first condensation chamber through a pipeline, and it is used to drive the steam to move from the heat exchange chamber to the first condensation chamber. The inlet end of the auxiliary ejector is communicated with the buffer chamber through a pipeline. The outlet end of the auxiliary ejector is communicated with the first condensation chamber through a pipeline, and it is used to drive the steam to move from the buffer chamber to the first condensation chamber.

8. The marine efficiency-enhanced steam jet refrigeration system according to claim 7, wherein, The medium circulation module further includes a plurality of baffles. Each baffle is arranged in a staggered manner from bottom to top in the buffer chamber to form an S-shaped channel for the steam to move upward in the buffer chamber. The inlet end of the water sprayer is communicated with the bottom of the buffer chamber. The second outlet end of the second three-way valve is communicated with the bottom of the buffer chamber through a pipeline. The inlet end of the auxiliary ejector is communicated with the top of the buffer chamber.

9. The marine efficiency-enhanced steam jet refrigeration system according to claim 3, wherein, The steam injection module further includes an exhaust gas boiler. The exhaust gas boiler uses the waste heat of the diesel engine exhaust gas to generate high-pressure superheated steam through its internal superheater. The high-pressure superheated steam moves to the main ejector and the auxiliary ejector respectively through pipelines to drive the main ejector and the auxiliary ejector respectively.

10. The marine efficiency-enhanced steam jet refrigeration system according to claim 9, characterized in that, The steam injection module further includes a first jacket, a second jacket, a hot well, a condensate discharge pump, and a boiler feed pump. The first jacket is wrapped around the pipeline where the inlet end of the main ejector communicates with the heat exchange chamber. A first cooling chamber is formed between the first jacket and the outer side wall of the corresponding pipeline. The second jacket is wrapped around the pipeline where the inlet end of the auxiliary ejector communicates with the buffer chamber. A second cooling chamber is formed between the second jacket and the outer side wall of the corresponding pipeline. Fresh water is stored in the hot well. The inlet end of the hot well is communicated with the first cooling chamber and the second cooling chamber respectively via pipelines. The inlet end of the condensate discharge pump is communicated with the condensate outlet end of the first condensation chamber. The first outlet end of the condensate discharge pump is communicated with the inlet end of the first cooling chamber via a pipeline, and it is used to pump the condensate in the first condensation chamber into the first cooling chamber. The second outlet end of the condensate discharge pump is communicated with the inlet end of the second cooling chamber via a pipeline, and it is used to pump the condensate in the first condensation chamber into the second cooling chamber. The inlet end of the boiler feed pump is communicated with the outlet end of the hot well. The outlet end of the boiler feed pump is communicated with the inlet end of the exhaust gas boiler, and it is used to pump the fresh water in the hot well into the exhaust gas boiler.

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