A heating system for a cable-laying ship with waste heat recovery

Abstract

This utility model discloses a heating system for a cable-laying vessel with waste heat recovery, belonging to the field of cable-laying vessels. The heating system includes a diesel engine cylinder liner, a hot water boiler system, a seawater cooling system, a first heat exchanger, and a second heat exchanger. The first heat exchanger's first heat exchange circuit is connected to the diesel engine cylinder liner, its second heat exchange circuit is connected to the hot water boiler system, its third heat exchange circuit is connected to the diesel engine cylinder liner, and its fourth heat exchange circuit is connected to the seawater cooling system. This heating system for a cable-laying vessel with waste heat recovery has a waste heat recovery function and can use the recovered heat to heat the cabins or preheat the cooling water in the seawater cooling system.

Description

Technical Field

[0001] This utility model relates to the field of cable-laying vessels, and in particular to a heating system for cable-laying vessels with waste heat recovery. Background Technology

[0002] Currently, most cable-laying vessels do not have waste heat recovery systems. Cable-laying vessels often directly heat the cabins through the power generation system. The main reason why most ships do not have waste heat recovery systems is that the tonnage of the ships is limited and the utilization rate of waste heat recovery is not high. However, many submarine cable-laying vessels have a tonnage of tens of thousands of tons, and their diesel engines will generate a lot of heat. If waste heat is not recovered, it will result in huge energy waste.

[0003] Chinese patent document CN117284465A discloses a marine integrated energy system combining refrigeration, cooling, and heating, and its operation method. The system includes a refrigeration, cooling, and heating system, a comfort terminal system, an air detection and control system, and an auxiliary energy supply system. The refrigeration, cooling, and heating system includes a compression module, a throttling module, a condensation module, a refrigeration evaporation module, and an air conditioning evaporation module. The air conditioning evaporation module is used to regulate the temperature inside the cabin, and the refrigeration evaporation module is used for cooling the refrigerated compartment. The air detection and control system is connected to the comfort terminal system, and the air conditioning condensation module is connected to the air detection and control system for heat exchange. The auxiliary energy supply system includes a solar panel installed on the hull, which is connected to the hull's energy supply system. When the power supply is insufficient, the above integrated energy system directly generates electricity from a diesel engine to provide heat energy for the heating system. This process requires converting the diesel engine's heat energy into electricity and then back into heat, resulting in significant energy loss. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the technical problem to be solved by this utility model is to propose a cable-laying ship heating system with waste heat recovery, which has the function of waste heat recovery and can use the recovered heat to heat the cabins or preheat the cooling water in the seawater cooling system.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] This utility model provides a heating system for a cable-laying vessel with waste heat recovery, comprising a diesel engine cylinder liner for generating heat energy, a hot water boiler system for heating the cabins, a seawater cooling system for providing cooling water to the diesel engine cylinder liner, a first heat exchanger, and a second heat exchanger. The first heat exchanger's first heat exchange circuit is connected to the diesel engine cylinder liner, the second heat exchanger's second heat exchange circuit is connected to the hot water boiler system, the third heat exchanger's third heat exchange circuit is connected to the diesel engine cylinder liner, and the fourth heat exchanger's fourth heat exchange circuit is connected to the seawater cooling system.

[0007] A further technical solution of this utility model is that it also includes a temperature-controlled three-way valve, the inlet of which is connected to the outlet of the diesel engine cylinder liner, the first outlet of which is connected to the inlet of the first heat exchange circuit, and the second outlet of which is connected to the inlet of the third heat exchange circuit.

[0008] A further technical solution of this utility model is that it also includes a first expansion tank, the outlet of the first heat exchange circuit is connected to the water inlet of the diesel engine cylinder liner through a first return water pipe, and the first expansion tank is located on the first return water pipe.

[0009] A further technical solution of this utility model is that the hot water boiler system includes a boiler, a heating circuit, and a heating device. The outlet of the boiler is connected to the inlet of the heating device through the heating pipe of the heating circuit. The return outlet of the heating device is connected to the return pipe of the boiler through the return pipe of the heating circuit. The second heat exchange circuit is connected to the return pipe.

[0010] A further technical solution of this utility model is that the hot water boiler system further includes at least one heat medium circulation pump, the return water pipe includes a near-end return water pipe and a far-end return water pipe, the near-end return water pipe is connected to the boiler, the far-end return water pipe is connected to the heating equipment, the outlet end of the far-end return water pipe is connected to the inlet of the heat medium circulation pump, the outlet of the heat medium circulation pump is connected to the inlet of the second heat exchange circuit, and the outlet of the second heat exchange circuit is connected to the inlet end of the near-end return water pipe.

[0011] A further technical solution of this utility model is that the hot water boiler system further includes a direct return water channel, a direct temperature control valve is provided on the direct return water channel, one end of the direct return water channel is connected to the outlet end of the far-end return water pipe, and the other end of the direct return water channel is connected to the inlet end of the near-end return water pipe.

[0012] A further technical solution of this utility model is that the hot water boiler system further includes a diversion channel, the inlet of the diversion channel is connected to the inlet of the second heat exchange circuit, the outlet of the diversion channel is connected to the outlet of the second heat exchange circuit, and a diversion solenoid valve is provided on the diversion channel.

[0013] A further technical solution of this utility model is that the hot water boiler system also includes a near-end return water channel, the inlet of the near-end return water channel is connected to the heating pipe, the outlet of the near-end return water channel is connected to the inlet of the near-end return water pipe, and a near-end temperature control valve is provided on the near-end return water channel.

[0014] A further technical solution of this utility model is that the first heat exchange circuit includes a first return water pipe and a first inlet water pipe connected to the first heat exchange coil, and the second heat exchange circuit includes a second return water pipe and a second inlet water pipe connected to the second heat exchange coil. A first solenoid valve is provided on the first return water pipe and / or a second solenoid valve is provided on the first inlet water pipe and / or a third solenoid valve is provided on the second return water pipe and / or a fourth solenoid valve is provided on the second inlet water pipe.

[0015] A further technical solution of this utility model is that it also includes a second expansion tank, which is located on the remote return water pipe.

[0016] The beneficial effects of this utility model are as follows:

[0017] The heating system for a cable-laying vessel with waste heat recovery provided by this utility model is equipped with a first heat exchanger and a second heat exchanger. The first heat exchanger can exchange the heat energy of the cooling water flowing out of the diesel engine cylinder liner to the hot water boiler system, thereby heating the cabin. The second heat exchanger can exchange the heat energy of the cooling water flowing out of the diesel engine cylinder liner to the seawater cooling system, thereby preheating the cooling water. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a cable-laying vessel heating system with waste heat recovery provided in a specific implementation embodiment.

[0019] In the picture:

[0020] 1. Diesel engine cylinder liner; 3. Seawater cooling system; 4. First heat exchanger; 5. Second heat exchanger; 6. Thermostatic three-way valve; 7. First expansion tank; 21. Boiler; 23. Heating equipment; 221. Heating pipe; 24. Heat medium circulation pump; 222. Near-end return water pipe; 223. Far-end return water pipe; 25. Straight-through return water channel; 251. Straight-through thermostatic valve; 26. Diversion channel; 261. Diversion solenoid valve; 27. Near-end return water channel; 271. Near-end thermostatic valve; 411. First return water pipe; 412. First inlet water pipe; 421. Second return water pipe; 422. Second inlet water pipe; 81. First solenoid valve; 82. Second solenoid valve; 83. Third solenoid valve; 84. Fourth solenoid valve; 9. Second expansion tank. Detailed Implementation

[0021] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1As shown, the cable-laying vessel heating system with waste heat recovery provided in this embodiment includes a diesel engine cylinder liner 1 for generating heat energy, a hot water boiler system for heating the cabins, a seawater cooling system 3 for providing cooling water to the diesel engine cylinder liner 1, a first heat exchanger 4, and a second heat exchanger 5. The temperature at the inlet of the diesel engine cylinder liner 1 is a first temperature, and the temperature at the outlet of the diesel engine cylinder liner 1 is a second temperature. The heat generated by the difference between the second and first temperatures corresponds to most of the heat absorbed by the cooling water. For example, if the first temperature is 85°C and the second temperature is 95°C, it is equivalent to the cooling water heating up by 10°C after flowing through the diesel engine cylinder liner 1, and the cooling water flowing through the diesel engine cylinder liner 1 absorbing most of the heat after heating up by 10°C. Some of the heat can be exchanged between the first heat exchanger 4 and the second heat exchanger 5. The first heat exchanger 4 has a first heat exchange circuit connected to the diesel engine cylinder liner 1 and a second heat exchange circuit connected to the hot water boiler system, thereby exchanging the heat energy of the cooling water flowing out of the diesel engine cylinder liner 1 to the hot water boiler system. The second heat exchanger 5 has a third heat exchange circuit connected to the diesel engine cylinder liner 1 and a fourth heat exchange circuit connected to the seawater cooling system 3, exchanging the heat energy of the cooling water flowing out of the diesel engine cylinder liner 1 to the seawater cooling system. This can preheat the cooling water in the seawater cooling system so that the initial temperature of the cooling water is maintained at the first temperature, avoiding the temperature from being too low and affecting the normal operation of the diesel engine.

[0023] To control the water flow into the first heat exchanger 4 and the second heat exchanger 5, and to control the on / off state of the first heat exchanger 4 and the second heat exchanger 5, the heating system for the cable-laying vessel with waste heat recovery further includes a thermostatic three-way valve 6. The inlet of the thermostatic three-way valve 6 is connected to the outlet of the diesel engine cylinder liner 1, the first outlet of the thermostatic three-way valve 6 is connected to the inlet of the first heat exchange circuit, and the second outlet of the thermostatic three-way valve 6 is connected to the inlet of the third heat exchange circuit. The thermostatic three-way valve 6 can adjust the opening and closing of the first outlet and the second outlet, thereby controlling the on / off state of the first heat exchanger 4 and the second heat exchanger 5 by controlling the opening and closing, and controlling the water flow into the first heat exchanger 4 and the second heat exchanger 5 by controlling the valve body opening.

[0024] To avoid pressure overload in the first heat exchange circuit and to accommodate the thermal expansion and contraction of the cooling water, in a further embodiment, the heating system for the cable-laying vessel with waste heat recovery also includes a first expansion tank 7. The outlet of the first heat exchange circuit is connected to the inlet of the diesel engine cylinder liner 1 or the seawater cooling system 3 via the first return water pipe 411. That is, the heat exchanged can flow back to the diesel engine cylinder liner 1 for circulation, or it can mix with the cooling water in the seawater cooling system 3 and then flow back to the diesel engine cylinder liner 1 for circulation. The first expansion tank 7 is located on the first return water pipe 411. When the temperature in the first return water pipe 411 is overloaded, the first expansion tank 7 will open to absorb a portion of the cooling water, thereby preventing the cooling water from over-expanding and damaging the first heat exchange circuit and the various components related to the first heat exchange circuit. The first expansion tank 7 serves as an overload protection function.

[0025] To facilitate cabin heating, in a further embodiment, the hot water boiler system includes a boiler 21, a heating circuit, and a heating device 23. The heating device 23 can be configured as a tubular radiator, a flat radiator, etc., and this application does not limit this. The outlet of the boiler 21 is connected to the inlet of the heating device 23 through the heating pipe 221 of the heating circuit, thereby providing hot water to the heating device 23. The return outlet of the heating device 23 is connected to the return pipe of the boiler 21 through the return pipe of the heating circuit. The second heat exchange circuit is connected to the return pipe, thereby enabling the first heat exchanger 4 to preheat the water returning to the boiler 21.

[0026] To improve the water circulation power of the hot water boiler system, in a further embodiment, the hot water boiler system also includes at least one heat medium circulation pump 24. For example, in this embodiment, the hot water boiler system includes two heat medium circulation pumps 24, and flow meters and control valves are distributed at both ends of the heat medium circulation pumps 24 to control the working flow of the circulation pumps 24. The return water pipe includes a near-end return water pipe 222 and a far-end return water pipe 223, which facilitates the series connection of the first heat exchanger 4. The near-end return water pipe 222 is connected to the boiler 21, and the far-end return water pipe... 223 is connected to the heating equipment 23. The outlet of the remote return water pipe 223 is connected to the inlet of the heat medium circulation pump 24. The heat medium circulation pump 24 can pressurize the water flowing out of the remote return water pipe 223. After pressurization, it flows into the second heat exchange circuit. The outlet of the heat medium circulation pump 24 is connected to the inlet of the second heat exchange circuit. The outlet of the second heat exchange circuit is connected to the inlet of the near-end return water pipe 222. After heat exchange in the first heat exchanger 4, it usually absorbs the heat from the first heat exchanger 4 and then flows back to the boiler 21 through the near-end return water pipe 222.

[0027] The hot water boiler system also includes a direct return water channel 25, on which a direct temperature control valve 251 is installed. One end of the direct return water channel 25 is connected to the outlet of the far-end return water pipe 223, and the other end is connected to the inlet of the near-end return water pipe 222. When heat exchange from the first heat exchanger 4 is not required, the direct return water channel 25 can be opened for return water. The hot water boiler system also includes a diversion channel 26, on which the inlet is connected to the inlet of the second heat exchange circuit, and the outlet is connected to the outlet of the second heat exchange circuit. A diversion solenoid valve 261 is installed on the diversion channel 26, which can be used to adjust the opening and closing of the diversion channel 26 and the flow rate. The hot water boiler system also includes a near-end return water channel 27. The inlet of the near-end return water channel 27 is connected to the heating pipe 221, and the outlet of the near-end return water channel 27 is connected to the inlet of the near-end return water pipe 222. A near-end thermostatic valve 271 is installed on the near-end return water channel 27, and the on / off state and flow rate of the near-end return water channel 27 can be adjusted by the near-end thermostatic valve 271.

[0028] In order to control the inflow and outflow of water in the first heat exchange circuit and the second heat exchange circuit, the first heat exchange circuit includes a first return water pipe 411 and a first inlet water pipe 412 connected to the first heat exchange coil, and the second heat exchange circuit includes a second return water pipe 421 and a second inlet water pipe 422 connected to the second heat exchange coil. A first solenoid valve 81 is provided on the first return water pipe 411 and / or a second solenoid valve 82 is provided on the first inlet water pipe 412 and / or a third solenoid valve 83 is provided on the second return water pipe 421 and / or a fourth solenoid valve 84 is provided on the second inlet water pipe 422.

[0029] To prevent pressure overload in the return water pipe and to accommodate the thermal expansion and contraction of the heating water, the cable-laying vessel heating system with waste heat recovery also includes a second expansion tank 9, located on the distal return water pipe 223. The function of the second expansion tank 9 is similar to that of the first expansion tank 7; in the event of an overload, the second expansion tank 9 opens to absorb a portion of the heating water, thus preventing excessive expansion of the heating water from damaging the heating circuit and related components. The second expansion tank 9 also serves as an overload protection device.

[0030] This utility model has been described through preferred embodiments. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. This utility model is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims of this application are all within the protection scope of this utility model.

Claims

1. A heating system for a cable-laying vessel with heat recovery, characterized in that, include: Cylinder liners for diesel engines used to generate heat; Hot water boiler system for cabin heating; A seawater cooling system for supplying cooling water to the cylinder liners of the diesel engine; The first heat exchanger has a first heat exchange circuit connected to the diesel engine cylinder liner, and a second heat exchange circuit connected to the hot water boiler system. The second heat exchanger has a third heat exchange circuit connected to the diesel engine cylinder liner, and a fourth heat exchange circuit connected to the seawater cooling system.

2. The cable-laying vessel heating system with waste heat recovery according to claim 1, characterized in that: It also includes a temperature-controlled three-way valve; The inlet of the temperature-controlled three-way valve is connected to the outlet of the diesel engine cylinder liner; The first outlet of the temperature-controlled three-way valve is connected to the inlet of the first heat exchange circuit; The second outlet of the temperature-controlled three-way valve is connected to the inlet of the third heat exchange circuit.

3. The cable-laying vessel heating system with waste heat recovery according to claim 1 or 2, characterized in that: It also includes a first expansion tank; The outlet of the first heat exchange circuit is connected to the inlet of the diesel engine cylinder liner through the first return water pipe, and the first expansion tank is located on the first return water pipe.

4. The cable-laying vessel heating system with waste heat recovery according to claim 3, characterized in that: The hot water boiler system includes a boiler, a heating circuit, and heating equipment; The boiler outlet is connected to the heating equipment inlet via the heating pipe of the heating circuit, the heating equipment return outlet is connected to the boiler return pipe via the return pipe of the heating circuit, and the second heat exchange circuit is connected to the return pipe.

5. The cable-laying vessel heating system with waste heat recovery according to claim 4, characterized in that: The hot water boiler system also includes at least one heat medium circulation pump; The return water pipeline includes a near-end return water pipe and a far-end return water pipe; The near-end return water pipe is connected to the boiler, and the far-end return water pipe is connected to the heating equipment; The outlet of the remote return water pipe is connected to the inlet of the heat medium circulation pump. The outlet of the heat medium circulation pump is connected to the inlet of the second heat exchange circuit. The outlet of the second heat exchange circuit is connected to the inlet of the near-end return water pipe.

6. The cable-laying vessel heating system with waste heat recovery according to claim 5, characterized in that: The hot water boiler system also includes a direct return water channel; A direct-flow temperature control valve is installed on the direct-flow return water channel; One end of the direct return water channel is connected to the outlet end of the remote return water pipe; The other end of the direct return water channel is connected to the inlet end of the near-end return water pipe.

7. The cable-laying vessel heating system with waste heat recovery according to claim 5, characterized in that: The hot water boiler system also includes a diversion channel; The inlet of the diversion channel is connected to the inlet of the second heat exchange circuit; The outlet of the diversion channel is connected to the outlet of the second heat exchange circuit; A flow diversion solenoid valve is installed on the flow diversion channel.

8. The cable-laying vessel heating system with waste heat recovery according to claim 6, characterized in that: The hot water boiler system also includes a near-end return water channel; The inlet of the near-end return water channel is connected to the heating pipe; The outlet of the near-end return water channel is connected to the inlet of the near-end return water pipe; A near-end temperature control valve is installed on the near-end return water channel.

9. The cable-laying vessel heating system with waste heat recovery according to claim 1, characterized in that: The first heat exchange circuit includes a first return water pipe and a first inlet water pipe connected to the first heat exchange coil; The second heat exchange circuit includes a second return water pipe and a second inlet water pipe connected to the second heat exchange coil; A first solenoid valve is installed on the first return water pipe; and / or A second solenoid valve is installed on the first water inlet pipe; and / or A third solenoid valve is installed on the second return water pipe; and / or A fourth solenoid valve is installed on the second water inlet pipe.

10. The cable-laying vessel heating system with waste heat recovery according to claim 5, characterized in that: It also includes a second expansion tank; The second expansion tank is located on the distal return water pipe.

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