阅读说明：本技术 一种主机空冷器冷却水的废热回收方法 (Waste heat recovery method for cooling water of air cooler of main engine ) 是由 钱强 段斌 于 2020-12-02 设计创作，主要内容包括：本发明公开了一种主机空冷器冷却水的废热回收方法,该方法在大型集装箱船正常航行时,可以利用从主机空冷器中流出的温度较高的冷却淡水中的热能来持续不断的加热备用发电机组的缸套水,不仅能够有效利用主机空冷器排出的冷却水中的废热能量,也能减少发电机预热系统中加热电能的使用,达到船舶节能的目的,同时也可以减少引入的海水来冷却从主机空冷器中流出的温度高的冷却淡水。(The invention discloses a waste heat recovery method of cooling water of a main engine air cooler, which can continuously heat cylinder sleeve water of a standby generator set by utilizing heat energy in cooling fresh water with higher temperature flowing out of the main engine air cooler when a large container ship sails normally, not only can effectively utilize waste heat energy in the cooling water discharged by the main engine air cooler, but also can reduce the use of heating electric energy in a generator preheating system to achieve the aim of saving energy of the ship, and simultaneously can reduce the introduced seawater to cool the cooling fresh water with high temperature flowing out of the main engine air cooler.)

1. A waste heat recovery method of cooling water of a main engine air cooler is characterized by comprising the following steps:

s1, installing a waste heat recovery system on the container ship;

the waste heat recovery system comprises a cooling water circulation pipeline for cooling water in the host air cooler and a cylinder sleeve water circulation pipeline for heating cylinder sleeve water in the generator set, and the cooling water circulation pipeline and the cylinder sleeve water circulation pipeline exchange heat through the waste heat recovery device;

s2, when the container ship normally operates, the main engine normally operates, cooling water with higher temperature in the main engine air cooler flows into the waste heat recovery device from the cooling water outlet, meanwhile, cylinder liner water with lower temperature in the standby generator set flows into the waste heat recovery device from the cylinder liner water outlet, and the cooling water with higher temperature exchanges heat with the cylinder liner water with lower temperature;

the heated cylinder sleeve water flows back to the generator set through a pre-heater on a cylinder sleeve water circulation pipeline, and the cooling water after primary cooling flows back to a main machine air cooler after being cooled again through a central cooler and a low-temperature cooling pump on a cooling water circulation pipeline;

and S3, when the main engine stops running, the cylinder sleeve water with lower temperature in the standby generator set directly flows into the standby generator set after being heated by the preheater on the cylinder sleeve water circulation pipeline.

2. The method of claim 1, wherein the cooling water circulation line includes a first cooling water pipe connected to the cooling water outlet of the main air cooler and the waste heat recovery device, a second cooling water pipe connected to the waste heat recovery device and the central cooler, a third cooling water pipe connected to the central cooler and the low temperature cooling pump, and a fourth cooling water pipe connected to the low temperature cooling pump and the cooling water inlet of the main air cooler.

3. The method of claim 2, wherein the first and second cooling water pipes are each provided with a control valve.

4. The waste heat recovery method of the cooling water of the main air cooler according to claim 1, wherein the cylinder liner water circulation pipeline comprises a first cylinder liner water pipe connected with a cylinder liner water outlet of the generator set and the waste heat recovery device, a second cylinder liner water pipe connected with the waste heat recovery device and the pre-heater, and a third cylinder liner water pipe connected with a cylinder liner water inlet of the pre-heater and the generator set, and a fourth cylinder liner water pipe is connected in parallel between the first cylinder liner water pipe and the second cylinder liner water pipe;

and control valves are arranged on the first cylinder sleeve water pipe, the second cylinder sleeve water pipe and the fourth cylinder sleeve water pipe.

5. The method for recovering the waste heat of the cooling water of the main air cooler as recited in claim 1, 2 or 4, wherein the waste heat recovery device comprises a shell and a coil, the coil is disposed in the shell, a water inlet end and a water outlet end of the coil respectively extend out from the top of the shell, a water inlet valve port and a water outlet valve port are disposed on two sides of the shell, and the cooling water in the main air cooler enters an inner cavity of the shell from the water inlet valve port and exchanges heat with cylinder liner water in the coil.

6. The method for recovering the waste heat of the cooling water of the main air cooler as recited in claim 5, wherein the housing comprises a hollow cylinder, a top plate fixed to a top of the cylinder, and a bottom plate fixed to a bottom of the cylinder, and the top plate is provided with circular holes for allowing the water inlet end and the water outlet end of the coil to pass through.

7. The method of claim 5, wherein the coil is of helical configuration.

Technical Field

The invention relates to the technical field of ship construction, in particular to a waste heat recovery method for cooling water of a main engine air cooler.

Background

Large container ships have a large cargo capacity and a high speed, and therefore have a large main engine power compared with other types of ships. When the main engine operates, a large amount of air is consumed, the air (scavenging air) is compressed by the supercharger and then is sent to the air cooler, and the air cooler is cooled by low-temperature fresh water and then is sent to the air cylinder to participate in combustion.

The fresh cooling water for cooling the scavenging air has a large amount of heat to be taken away, so that the flow rate of the fresh cooling water is large, and the water temperature is high when the fresh cooling water flows out of the air cooler, particularly the temperature of the fresh cooling water flowing out of the air cooler of the WinGD type main machine exceeds 60 ℃, and the fresh cooling water returns to the central cooler for reuse after flowing out of the air cooler. The heat energy contained in this portion of the chilled fresh water, in addition to not being utilized, requires a certain amount of seawater for cooling.

Meanwhile, a large container ship is generally provided with 4-6 generator sets, and in the normal navigation process, the generator sets serving as standby generator sets need to keep continuous cylinder liner water preheating so as to be immediately put into use when needed. Therefore, the cylinder liner water preheater of the generator set needs continuously heated cylinder liner water to ensure the safety of the ship.

At present, cooling fresh water for cooling scavenging air flows out of an air cooler, enters a central cooler for cooling, and is pressurized by a low-temperature fresh water pump and then is used for cooling a main machine again. In this way, not only is the heat energy in the low-temperature water not utilized, but also a certain amount of seawater is consumed to cool the cooling fresh water. Meanwhile, for the standby generator set, the cylinder liner water preheater usually heats the cylinder liner water by using the electric heater, so as to heat the cylinder liner, and the cylinder liner of the standby generator set also needs to consume a large amount of electric energy, so that a large amount of resource waste is caused.

Disclosure of Invention

In view of the above, the present invention provides a method for recovering waste heat from cooling water of a main engine air cooler, which uses heat energy in cooling fresh water with a relatively high temperature flowing out from the main engine air cooler to continuously heat cylinder liner water of a standby generator set when a large container ship is in normal navigation, so as to reduce the use of heating electric energy in a generator preheating system, achieve the purpose of saving energy for the ship, and reduce the introduced seawater to cool the cooling fresh water with a high temperature flowing out from the main engine air cooler.

A waste heat recovery method of cooling water of a main engine air cooler specifically comprises the following steps:

s1, installing a waste heat recovery system on the container ship;

the waste heat recovery system comprises a cooling water circulation pipeline for cooling water in the host air cooler and a cylinder sleeve water circulation pipeline for heating cylinder sleeve water in the generator set, and the cooling water circulation pipeline and the cylinder sleeve water circulation pipeline exchange heat through the waste heat recovery device;

s2, when the container ship normally operates, the main engine normally operates, cooling water with higher temperature in the main engine air cooler flows into the waste heat recovery device from the cooling water outlet, meanwhile, cylinder liner water with lower temperature in the standby generator set flows into the waste heat recovery device from the cylinder liner water outlet, and the cooling water with higher temperature exchanges heat with the cylinder liner water with lower temperature;

the heated cylinder sleeve water flows back to the generator set through a pre-heater on a cylinder sleeve water circulation pipeline, and the cooling water after primary cooling flows back to a main machine air cooler after being cooled again through a central cooler and a low-temperature cooling pump on a cooling water circulation pipeline;

and S3, when the main engine stops running, the cylinder sleeve water with lower temperature in the standby generator set directly flows into the standby generator set after being heated by the preheater on the cylinder sleeve water circulation pipeline.

Preferably, the cooling water circulation line includes a first cooling water pipe connected to the cooling water outlet of the main unit air cooler and the waste heat recovery device, a second cooling water pipe connected to the waste heat recovery device and the central cooler, a third cooling water pipe connected to the central cooler and the low temperature cooling pump, and a fourth cooling water pipe connected to the low temperature cooling pump and the cooling water inlet of the main unit air cooler,

preferably, the first cooling water pipe and the second cooling water pipe are both provided with control valves.

Preferably, the cylinder sleeve water circulation pipeline comprises a first cylinder sleeve water pipe connected with a cylinder sleeve water outlet of the generator set and the waste heat recovery device, a second cylinder sleeve water pipe connected with the waste heat recovery device and the pre-heater, and a third cylinder sleeve water pipe connected with the pre-heater and a cylinder sleeve water inlet of the generator set, and a fourth cylinder sleeve water pipe is connected in parallel between the first cylinder sleeve water pipe and the second cylinder sleeve water pipe;

and control valves are arranged on the first cylinder sleeve water pipe, the second cylinder sleeve water pipe and the fourth cylinder sleeve water pipe.

Preferably, the waste heat recovery device comprises a shell and a coil pipe, the coil pipe is arranged in the shell, a water inlet end and a water outlet end of the coil pipe extend out of the top of the shell respectively, a water inlet valve port and a water outlet valve port are arranged on two sides of the shell, and cooling water in the main air cooler enters an inner cavity of the shell from the water inlet valve port and exchanges heat with cylinder liner water in the coil pipe.

Preferably, the shell comprises a hollow cylinder, a top plate fixed at the top of the cylinder and a bottom plate fixed at the bottom of the cylinder, and the top plate is provided with round holes for the water inlet end and the water outlet end of the coil pipe to pass through.

Preferably, the coil is of helical construction.

The invention has the beneficial effects that:

1. when a large container ship sails normally, the system for recycling the waste heat of the cooling water of the main air cooler can continuously heat the cylinder sleeve water of the standby generator set by using the heat energy in the cooling fresh water with higher temperature flowing out of the main air cooler, thereby not only effectively utilizing the waste heat energy in the cooling water discharged by the main air cooler, but also reducing the use of heating electric energy in the generator preheating system to achieve the aim of saving energy of the ship, and simultaneously reducing the introduced seawater to cool the cooling fresh water with high temperature flowing out of the main air cooler.

2. In the cooling water circulation pipeline of the air cooler of the main engine of the large container ship, the waste heat recovery device is arranged on the cooling water outlet pipeline of the air cooler, and the waste heat energy in the cooling water of the main engine air cooler is reasonably utilized by the waste heat recovery device, so that the energy-saving device has high practical value for ship energy conservation.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of a host air cooler cooling water waste heat recovery system.

Fig. 2 is a schematic structural view of the exhaust heat recovery apparatus.

The reference numerals in the figures have the meaning:

the system comprises a main machine air cooler 1, a generator set 2, a preheater 3, a cooling water outlet 4, a cooling water inlet 5, a waste heat recovery device 6, a central cooler 7, a low-temperature cooling pump 8, a first cooling water pipe 9, a second cooling water pipe 10, a third cooling water pipe 11, a fourth cooling water pipe 12, a cylinder liner water outlet 13, a cylinder liner water inlet 14, a first cylinder liner water pipe 15, a second cylinder liner water pipe 16, a third cylinder liner water pipe 17, a fourth cylinder liner water pipe 18, a shell 19, a coil pipe 20, a water inlet valve port 21 and a water outlet valve port 22.

Detailed Description

For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.

It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The present application is described in further detail below with reference to specific embodiments and with reference to the attached drawings.

In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless specified or indicated otherwise; the terms "connected" and "fixed" are used in a broad sense, for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

When the large container ship is in normal navigation, low-temperature cooling water needs to be introduced into the main air cooler 1 to reduce the temperature of scavenging air in the air cooler. When the low-temperature cooling water absorbs the heat in the scavenging air and cools the scavenging air, the cooling water with higher temperature (usually the cooling water with temperature over 60 ℃) is discharged from the air cooler. The cooling water with higher temperature enters the central cooler for cooling, and then is pressurized by the low-temperature cooling fresh water pump and sent into the air cooler for recycling.

Meanwhile, when the ship normally sails, the standby generator set 2 on the container ship needs to be kept in a standby state all the time, so that the standby generator set 2 needs to be continuously heated by using cylinder liner water. When the standby generator set 2 is preheated, the electric heater in the preheater 3 is usually used for heating cylinder liner water, and then the heated cylinder liner water is sent to the standby generator set 2 to heat the cylinder liner of the diesel engine.

The waste heat recovery method of the cooling water of the main air cooler is designed in order to fully utilize the waste heat in the cooling water of the main air cooler and reduce the electric energy consumed by the pre-heater, because the cooling water discharged from the main air cooler 1 contains a large amount of heat, and the pre-heating of the standby generator set 2 just needs the heat to heat the cylinder liner water of the main air cooler.

The waste heat recovery method of the cooling water of the main engine air cooler is a waste heat recovery system arranged on a container ship, and the system can continuously heat the cylinder liner water of the standby generator set 2 by utilizing the heat energy in the cooling fresh water with higher temperature flowing out from the main engine air cooler 1 when the large container ship normally sails, so that the use of the heating electric energy in the generator preheating system is reduced, the aim of saving energy of the ship is fulfilled, and the introduced seawater can be reduced to cool the cooling fresh water with high temperature flowing out from the main engine air cooler.

Specifically, the waste heat recovery system includes a cooling water circulation line for cooling the cooling water in the main unit air cooler 1 and a liner water circulation line for heating the liner water in the generator set 2.

The cooling water in the main air cooler 1 flows back to the main air cooler 1 from a cooling water inlet 5 through a waste heat recovery device 6, a central cooler 7 and a low-temperature cooling pump 8 on a cooling water circulation pipeline from a cooling water outlet 4 of the main air cooler 1.

The cooling water circulation pipeline comprises a first cooling water pipe 9 connected with the cooling water outlet 4 of the main air cooler and the waste heat recovery device 6, a second cooling water pipe 10 connected with the waste heat recovery device 6 and the central cooler 7, a third cooling water pipe 11 connected with the central cooler 7 and the low-temperature cooling pump 8, and a fourth cooling water pipe 12 connected with the low-temperature cooling pump 8 and the cooling water inlet 5 of the main air cooler.

Control valves are mounted on the first cooling water pipe 9 and the second cooling water pipe 10.

The cylinder liner water in the generator set 2 flows back to the generator set 2 from a cylinder liner water outlet 13 of the generator set through the waste heat recovery device 6 and the pre-heater 3 on the cylinder liner water circulation pipeline, or the cylinder liner water in the generator set 2 directly flows back to the generator set 2 after being heated by the pre-heater 3.

The cylinder sleeve water circulation pipeline comprises a first cylinder sleeve water pipe 15 connected with a cylinder sleeve water outlet 13 of the generator set and the waste heat recovery device 6, a second cylinder sleeve water pipe 16 connected with the waste heat recovery device 6 and the pre-heater 3, and a third cylinder sleeve water pipe 17 connected with the pre-heater 3 and a cylinder sleeve water inlet 14 of the generator set, wherein a fourth cylinder sleeve water pipe 18 is connected in parallel between the first cylinder sleeve water pipe 15 and the second cylinder sleeve water pipe 16;

and control valves are respectively arranged on the first cylinder sleeve water pipe 15, the second cylinder sleeve water pipe 16 and the fourth cylinder sleeve water pipe 18.

The waste heat recovery device 6 comprises a shell 19 and a coil pipe 20, the coil pipe 20 is arranged in the shell 19, a water inlet end and a water outlet end of the coil pipe 20 extend out of the top of the shell 19 respectively, a first cylinder sleeve water pipe 15 is connected to the water inlet end of the coil pipe 20, a second cylinder sleeve water pipe 16 is connected to the water outlet end of the coil pipe 20, and cylinder sleeve water in the standby generator set 2 is conveyed into the coil pipe 20 from the first cylinder sleeve water pipe 15.

And a water inlet valve port 21 and a water outlet valve port 22 are arranged on two sides of the shell 19, the first cooling water pipe 9 is connected to the water inlet valve port 21, and the second cooling water pipe 10 is connected to the water outlet valve port 22. The cooling water in the main machine air cooler 1 enters the inner cavity of the shell from the water inlet valve port 21 and exchanges heat with the cylinder liner water in the coil pipe 20. In this embodiment, the coil 20 has a spiral structure.

The shell 19 comprises a hollow cylinder, a top plate fixed at the top of the cylinder and a bottom plate fixed at the bottom of the cylinder, wherein the top plate is provided with round holes for the water inlet end and the water outlet end of the coil pipe to pass through.

For ease of manufacture and installation in use, in this embodiment, the top and bottom plates are designed as circular plates of equal size, and the top, bottom and cylindrical bodies together define a housing having a cylindrical interior in which the coil 20 is disposed with its water inlet and outlet ends extending from the top of the housing 19, respectively.

The invention discloses a waste heat recovery method of cooling water of a host air cooler, which comprises the following steps:

s1, installing an exhaust heat recovery system on the container ship.

S2, when the ship sails normally, the main engine operates normally, the control valve k1 on the first cooling water pipe 9, the control valve k2 on the second cooling water pipe 10, the control valve k3 on the first cylinder sleeve water pipe 9 and the control valve k4 on the second cylinder sleeve water pipe 16 are opened, cooling water with higher temperature flowing out of the cooling water outlet of the main engine air cooler 1 is sent into the shell inner cavity of the waste heat recovery device 6 from the first cooling water pipe 9, and meanwhile, cylinder sleeve water with lower temperature in the standby generator set 2 flows into the coil 20 of the waste heat recovery device 6 from the cylinder sleeve water outlet through the first cylinder sleeve water pipe 15.

The cooling water with higher temperature in the inner cavity of the shell of the waste heat recovery device 6 exchanges heat with the liner water with lower temperature in the coil 20 thereof. The heated cylinder jacket water flows from the second cylinder jacket water pipe 16 into the preheater 3 and then into the standby generator set 2. The primarily cooled cooling water flows from the second cooling water pipe 10 into the central cooler 7 and the low-temperature cooling pump 8 to be cooled again, and then flows back to the main unit air cooler 1.

And S3, when the main engine stops running, the cooling water with higher temperature flowing out of the main engine air cooler 1 cannot heat the cylinder sleeve water in the standby generator set 2. At this time, the control valve k3 on the first cylinder jacket water pipe 15 and the control valve k4 on the second cylinder jacket water pipe 16 are closed, the control valve k5 on the fourth cylinder jacket water pipe 18 is opened, and the cylinder jacket water with a lower temperature in the standby generator set 2 flows into the pre-heater 3 from the cylinder jacket water outlet through the first cylinder jacket water pipe 15, the fourth cylinder jacket water pipe 18 and the second cylinder jacket water pipe 16, is heated by the pre-heater 3, and then enters the standby generator set 2.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.