Ship cylinder sleeve water waste heat recovery system and method

Abstract

The invention discloses a ship cylinder sleeve water waste heat recovery system and method. A ship main engine provides cylinder sleeve water in a heat source module mode. The first plate heat exchanger and the second plate heat exchanger are located behind the marine main engine and sequentially connected in series to form two-stage heat exchange, the marine main engine and the first plate heat exchanger are connected through a cylinder sleeve water pipe system for heat exchange, and the first plate heat exchanger and the second plate heat exchanger are connected through a seawater pipe system for heat exchange. A water hose system is further arranged on the second plate heat exchanger; the water hose system is located at the rear-stage branch of the passage of the second plate heat exchanger and comprises double branches which are connected in parallel, and the double branches comprise a heavy cargo hold direct supply branch and an air conditioner regulation and control branch; the expansion water tank is communicated with the water hose system to implement pressurization; according to the system, waste heat of ship main engine cylinder sleeve water is recycled through two-stage heat exchange, dual-application branch energy utilization of a fishing boat heavy cargo hold and a cabin air conditioner is achieved, energy conservation and emission reduction are achieved, and the system is small in space requirement, low in cost and suitable for being popularized in small and medium-sized fishing boats.

Description

Technical Field

[0001] The present invention relates to a ship jacket water waste heat recovery system, and in particular to a ship jacket water waste heat recovery system and method. Background Art

[0002] my country has the largest number of fishing vessels in the world. Fishing operations are primarily concentrated in the cold season, and heating and hot water requirements are common among small and medium-sized fishing vessels. During operation, only a portion of the energy generated by fuel combustion in a marine diesel engine is converted into propulsion power, with over 50% dissipated as waste heat. This waste heat, generated by the jacket water, accounts for approximately 25% of the total heat generated by the diesel engine.

[0003] Utilizing waste heat from diesel engines on large ships has long been a research hotspot. Numerous methods have been proposed for waste heat recovery, including the Kenlang cycle system, turbine generators, fresh water generators, exhaust gas boilers, and waste heat refrigeration. However, research on waste heat recovery from jacket water in small and medium-sized fishing vessels is limited. Waste heat recovery systems for large ships are bulky and costly, making them difficult to implement on small and medium-sized fishing vessels, where space is limited and economical considerations are crucial.

[0004] Therefore, there is an urgent need to develop a compact and economical jacket water waste heat recovery system to meet the thermal energy needs of small and medium-sized fishing vessels for heating and cargo hold insulation. Summary of the Invention

[0005] In order to solve the deficiencies of the above technologies, the present invention provides a ship jacket water waste heat recovery system and method.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a ship jacket water waste heat recovery system and method, which is applied to small and medium-sized fishing vessels and includes: Marine main engines that provide jacket water in the form of heat source modules; The first plate heat exchanger and the second plate heat exchanger are connected in series after the main engine of the ship to form a two-stage heat exchange. The main engine of the ship and the first plate heat exchanger are connected for heat exchange via a jacket water pipe system, and the first plate heat exchanger and the second plate heat exchanger are connected for heat exchange via a seawater pipe system. The second plate heat exchanger is also provided with a soft water pipe system. The soft water pipe system is located at the back of the second plate heat exchanger and is divided into two parallel branches, including a heavy cargo hold direct supply branch and an air conditioning control branch; It also includes an expansion water tank that is connected to the soft water pipe system to implement pressurization.

[0007] Furthermore, the liner water pipe system is filled with liner water, the seawater pipe system is filled with seawater, and the soft water pipe system is filled with soft water.

[0008] Furthermore, the first plate heat exchanger is implemented in a manner of achieving heat exchange between jacket water and seawater, and the second plate heat exchanger is implemented in a manner of achieving heat exchange between seawater and soft water.

[0009] Furthermore, a first circulating water pump is provided at one end of the cylinder jacket water pipe flowing into the first plate heat exchanger, and a first valve is provided at one end of the cylinder jacket water pipe flowing into the main engine of the ship.

[0010] Furthermore, a second valve and a third valve are provided at the inflow ends of the seawater pipe system to the first plate heat exchanger and the second plate heat exchanger respectively.

[0011] Furthermore, the soft water pipe system is equipped with a fourth valve and a fifth valve at the inflow end and the outflow end of the circulation passage of the second plate heat exchanger respectively, and the soft water pipe system is also provided with a sixth valve in the circulation passage of the second plate heat exchanger.

[0012] Furthermore, the soft water pipe system is provided with an independent water inlet end, which is located before the fourth valve and the expansion water tank, and the heavy cargo hold direct supply branch and the air conditioning control branch are both located after the fifth valve.

[0013] Furthermore, the soft water in the heavy cargo hold direct supply branch flows through the heavy cargo hold of the fishing boat, and the soft water in the air-conditioning control branch flows through the heat pump and the cabin air-conditioning in turn. The soft water flowing through the heavy cargo hold direct supply branch and the air-conditioning control branch respectively merges and is pumped to the inlet end of the second plate heat exchanger through the second circulating water pump.

[0014] A method for recovering waste heat from a ship's jacket water system, comprising the following steps: S1. After running the main engine and the first circulating water pump, open the first valve to allow the jacket water to flow through the main engine to absorb heat, then be pressurized by the first circulating water pump, pass through the jacket water pipe system, enter the first heat exchanger to release heat, and then flow back to the main engine through the first valve; S2. Open the second and third valves to allow seawater to flow through the first heat exchanger to absorb heat, then enter the second heat exchanger through the third valve to release heat, and then flow back to the first heat exchanger through the second valve; S3. Close the sixth valve, open the fourth and fifth valves, and the soft water is pressurized by the expansion tank, enters the second heat exchanger through the fourth valve to absorb heat, and then outputs through the fifth valve; S4. Divert the soft water output in step S3, The first part of the soft water flows to the heavy cargo hold of the fishing boat to release heat. The second part of the soft water flows through the heat pump to be heated and then supplied to the cabin air conditioner to release heat; S5. The cooled soft water discharged from the first and second parts in step S4 is collected and returned to the soft water inlet after being pressurized by the second circulating water pump.

[0015] A ship jacket water waste heat recovery system and method utilizes two-stage heat exchange to recover waste heat from the ship's main engine jacket water, enabling dual-application branch energy utilization for the fishing vessel's heavy cargo hold and cabin air conditioning, thereby achieving energy conservation and emission reduction. The system requires little space and is low in cost, making it suitable for promotion in small and medium-sized fishing vessels. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a flow diagram of the present invention.

[0017] In the figure: 1. Expansion tank; 2. First heat exchanger; 3. Second heat exchanger; 4. Ship's main engine; 5. First circulating water pump; 6. First valve; 7. Second valve; 8. Third valve; 9. Fourth valve; 10. Fifth valve; 11. Sixth valve; 12. Fishing vessel's heavy cargo hold; 13. Heat pump; 14. Cabin air conditioner; 15. Second circulating water pump. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 1 As shown, this embodiment relates to a system and method for recovering waste heat from jacket water of a ship. The system is applied to small and medium-sized fishing vessels and includes: The main engine 4 of the ship provides the jacket water in the form of a heat source module. It can be understood that the main engine 4 of the ship uses the waste heat generated during its operation to heat its own jacket water; the first plate heat exchanger 2 and the second plate heat exchanger 3 are connected in series in sequence after the main engine 4 of the ship to form a two-stage heat exchange. It can be understood that the first plate heat exchanger 2 is used to process the first stage heat exchange, and the second plate heat exchanger 3 is used to process the second stage heat exchange; on this basis, the main engine 4 of the ship is connected to the first plate heat exchanger 2 through a jacket water pipe system for heat exchange, and the jacket water pipe system is filled with jacket water. The first plate heat exchanger The heat exchanger 2 is connected to the second plate heat exchanger 3 by a seawater pipe system for heat exchange. The seawater pipe system is filled with seawater. The second plate heat exchanger 3 is also provided with a soft water pipe system, which is filled with soft water. The soft water pipe system is located at the rear stage of the passage of the second plate heat exchanger 3 and branches into two parallel branches. The two branches include a heavy cargo hold direct supply branch and an air-conditioning control branch. It can be understood that this embodiment forms two parallel application branches in terms of heat utilization, increases heat utilization scenarios, and improves heat utilization efficiency. In addition, it also includes an expansion water tank 1 connected to the soft water pipe system for pressurization.

[0020] The first plate heat exchanger 2 is implemented in a manner of achieving heat exchange between the jacket water and seawater. After the heat exchange is achieved, the seawater becomes a heat source. Then, the second plate heat exchanger 3 is implemented in a manner of achieving heat exchange between the seawater and soft water. The heated soft water becomes a usable heat medium.

[0021] A first circulating water pump 5 is provided at the end of the jacket water pipe flowing into the first plate heat exchanger 2, and a first valve 6 is provided at the end of the jacket water pipe flowing into the ship's main engine 4; a second valve 7 and a third valve 8 are provided at the inflow ends of the seawater pipe into the first plate heat exchanger 2 and the second plate heat exchanger 3, respectively; a fourth valve 9 and a fifth valve 10 are provided at the inflow end and outflow end of the circulation passage of the second plate heat exchanger 3, respectively, and a sixth valve 11 is also provided in the circulation passage of the second plate heat exchanger 3.

[0022] In the circulation system of the soft water pipe system, the soft water pipe system is provided with an independent water inlet end, which is located in the front stage of the circulation of the fourth valve 9 and the expansion water tank 1, thereby ensuring the effective replenishment of soft water. The heavy cargo hold direct supply branch and the air-conditioning control branch are both located in the rear stage of the circulation of the fifth valve 10; it should be noted that the sixth valve 11 is in the bypass pipeline in the actual soft water circulation, and the sixth valve 11 maintains the circulation of the ship's cylinder jacket water waste heat recovery system in a short-circuit circulation manner in the bypass pipeline.

[0023] The soft water in the heavy cargo hold direct supply branch flows through the heavy cargo hold 12 of the fishing boat, and the soft water that has undergone heat exchange releases heat into the heavy cargo hold 12 of the fishing boat. In actual operation, the soft water passage can exchange heat with the air in the cabin through the built-in coil or radiator in the heavy cargo hold 12 of the fishing boat; the soft water in the air-conditioning control branch flows through the heat pump 13 and the cabin air-conditioning 14 in turn, and the heat pump 13 increases the temperature of the soft water so that it can flow to the cabin air-conditioning 14 for heating; the cooled soft water that flows through the heavy cargo hold direct supply branch and the air-conditioning control branch respectively is merged and pumped to the inlet end of the second plate heat exchanger 3 through the second circulating water pump 15.

[0024] A method for recovering waste heat from a ship's jacket water system, comprising the following steps: S1. After running the main engine 4 and the first circulating water pump 5, open the first valve 6 to allow the jacket water to flow through the main engine 4 to absorb heat, then be pressurized by the first circulating water pump 5, pass through the jacket water pipe system, enter the first heat exchanger 2 to release heat, and then flow back to the main engine 4 through the first valve 6; S2. Open the second valve 7 and the third valve 8, so that the seawater flows through the first heat exchanger 2 to absorb heat, then enters the second heat exchanger 3 through the third valve 8 to release heat, and then flows back to the first heat exchanger 2 through the second valve 7; S3. Close the sixth valve 11, open the fourth valve 9 and the fifth valve 10, the soft water is pressurized by the expansion tank 1, enters the second heat exchanger 3 through the fourth valve 9 to absorb heat, and then outputs through the fifth valve 10;

[0025] S4. Divert the soft water output in step S3, The first part of the soft water flows to the heavy cargo hold 12 of the fishing boat to release heat. The second part of the soft water flows through the heat pump 13 to be heated and then supplied to the cabin air conditioner 14 to release heat; S5. The cooled soft water discharged from the first and second parts in step S4 is collected and returned to the soft water inlet after being pressurized by the second circulating water pump 15.

[0026] The present application discloses a waste heat recovery system and method for ship cylinder jacket water, which uses two-stage heat exchange to recover waste heat from the cylinder jacket water of the ship's main engine, realizes dual-application branch energy utilization of the fishing vessel's heavy cargo hold and cabin air conditioning, and achieves energy conservation and emission reduction. The system has small space requirements and low cost, and is suitable for promotion in small and medium-sized fishing vessels.

[0027] The above embodiments are not limitations of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by technicians in this technical field within the scope of the technical solution of the present invention also fall within the scope of protection of the present invention.

Claims

1. A ship jacket water waste heat recovery system, characterized in that: Applicable to small and medium-sized fishing vessels and includes: A ship main engine (4) that provides jacket water in the form of a heat source module; A first plate heat exchanger (2) and a second plate heat exchanger (3) are sequentially connected in series after the main engine (4) of the ship to form a two-stage heat exchange. The main engine (4) of the ship and the first plate heat exchanger (2) are connected for heat exchange via a jacket water pipe system. The first plate heat exchanger (2) and the second plate heat exchanger (3) are connected for heat exchange via a seawater pipe system. The second plate heat exchanger (3) is also provided with a soft water pipe system. The soft water pipe system is located at the rear stage of the passage of the second plate heat exchanger (3) and branches into two parallel branches, the two branches including a heavy cargo hold direct supply branch and an air conditioning control branch; It also includes an expansion water tank (1) connected to the soft water pipe system for pressurization.

2. The ship jacket water waste heat recovery system according to claim 1, characterized in that: The cylinder jacket water pipe system is filled with cylinder jacket water, the seawater pipe system is filled with seawater, and the soft water pipe system is filled with soft water.

3. The ship jacket water waste heat recovery system according to claim 2, characterized in that: The first plate heat exchanger (2) is implemented in a manner to achieve heat exchange between jacket water and seawater, and the second plate heat exchanger (3) is implemented in a manner to achieve heat exchange between seawater and soft water.

4. The ship jacket water waste heat recovery system according to claim 1, characterized in that: A first circulating water pump (5) is provided at one end of the cylinder jacket water pipe flowing into the first plate heat exchanger (2), and a first valve (6) is provided at one end of the cylinder jacket water pipe flowing into the main engine (4) of the ship.

5. The ship jacket water waste heat recovery system according to claim 1, characterized in that: The inflow ends of the seawater pipe system to the first plate heat exchanger (2) and the second plate heat exchanger (3) are respectively provided with a second valve (7) and a third valve (8).

6. The ship jacket water waste heat recovery system according to claim 1, characterized in that: The soft water pipe system is equipped with a fourth valve (9) and a fifth valve (10) at the inflow end and the outflow end of the circulation passage of the second plate heat exchanger (3), respectively. The soft water pipe system is also provided with a sixth valve (11) in the circulation passage of the second plate heat exchanger (3).

7. The ship jacket water waste heat recovery system according to claim 6, characterized in that: The soft water pipe system is provided with an independent water inlet end, which is located in the flow front stage of the fourth valve (9) and the expansion water tank (1), and the heavy cargo hold direct supply branch and the air conditioning control branch are both located in the flow rear stage of the fifth valve (10).

8. The ship jacket water waste heat recovery system according to claim 2, characterized in that: The soft water in the heavy cargo hold direct supply branch flows through the heavy cargo hold (12) of the fishing vessel, and the soft water in the air conditioning control branch flows through the heat pump (13) and the cabin air conditioner (14) in sequence. The soft water flowing through the heavy cargo hold direct supply branch and the air conditioning control branch respectively merges and is pumped to the inlet end of the second plate heat exchanger (3) through the second circulating water pump (15).

9. The method of the ship jacket water waste heat recovery system according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. After operating the ship's main engine (4) and the first circulating water pump (5), the first valve (6) is opened, so that the jacket water flows through the ship's main engine (4) to absorb heat, is pressurized by the first circulating water pump (5), passes through the jacket water pipe system, enters the first heat exchanger (2) to release heat, and then flows back to the ship's main engine (4) through the first valve (6); S2. Open the second valve (7) and the third valve (8), so that the seawater flows through the first heat exchanger (2) to absorb heat, then enters the second heat exchanger (3) through the third valve (8) to release heat, and then flows back to the first heat exchanger (2) through the second valve (7); S3. Close the sixth valve (11), open the fourth valve (9) and the fifth valve (10), and the soft water is pressurized by the expansion tank (1), enters the second heat exchanger (3) through the fourth valve (9) to absorb heat, and is then output through the fifth valve (10); S4. Divert the soft water output in step S3, The first part of the soft water flows to the heavy cargo hold (12) of the fishing vessel to release heat. The second part of the soft water flows through the heat pump (13) and is heated and then supplied to the cabin air conditioner (14) to release heat; S5. The cooled soft water discharged from the first and second parts in step S4 is collected and returned to the soft water inlet after being pressurized by the second circulating water pump (15).

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