A ship air compressor cooling water temperature control and automatic degassing system and method thereof

Abstract

The application discloses a kind of ship air compressor cooling water temperature control and automatic degassing system and method thereof, including central fresh water cooler, cooling water expansion tank, first air compressor, second air compressor, self-acting temperature control valve and cooling water degassing cylinder, the water inlet of central fresh water cooler is communicated with cooling water expansion tank by expansion tank drain pipe, the water inlet of first air compressor and second air compressor is communicated with the water outlet of self-acting temperature control valve by cooling water inlet pipe, the water outlet of central fresh water cooler is communicated with the first water inlet of self-acting temperature control valve, the water outlet of first air compressor and second air compressor is respectively communicated with the water inlet of cooling water degassing cylinder by cooling water outlet pipe, the first water outlet of cooling water degassing cylinder is communicated with the second water inlet of self-acting temperature control valve by first cooling water circulation pipe.The application has the advantages of preventing condensate from being precipitated due to excessive cooling, entering lubricating oil to cause air compressor lubricating oil emulsification, and automatically removing gas in cooling system.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, and in particular to a system and method for controlling the cooling water temperature and automatically degassing a ship air compressor. Background Technology

[0002] Large ships typically employ a central freshwater cooling system, with the central cooler outlet water temperature set at 36°C. An air compressor is connected in series after the central cooler, and a central cooling freshwater pump supplies freshwater cooled by the central cooler at a temperature of 36°C. The air compressor does not have a semi-independent cooling water circulation system.

[0003] Under normal maritime operating conditions, the aforementioned design generates significant waste heat from the internal combustion engine due to the operation of the main and auxiliary engines. This waste heat, after entering the cooling water system, is sufficient to maintain the central cooling freshwater temperature at 36°C. However, once the ship is moored, the waste heat decreases considerably after the main engine stops operating. Large ships typically have a large freshwater reserve in their central cooling water system, and the waste heat generated by a single generator is insufficient to maintain the central cooling freshwater temperature at 36°C. The cooling freshwater temperature within the system will continuously decrease. If the ship uses shore power and the generator stops operating, the cooling freshwater temperature will approach the engine room air temperature. In winter, the central cooling freshwater temperature can become very low, potentially between 0 and 10°C. This temperature is far below the 36-45°C required by the air compressor manufacturer for the cooling freshwater inlet temperature, leading to over-cooling of the air compressor. Water vapor in the compressed air condenses and enters the air compressor's lubrication system, causing the lubricating oil to emulsify and lose its lubricating effect. Summary of the Invention

[0004] The purpose of this invention is to provide a cooling water temperature control and automatic degassing system and method for marine air compressors, which prevents condensation caused by excessive cooling, avoids the failure of air compressor lubricating oil emulsification and loss of lubrication effect due to the condensed water entering the lubricating oil, and automatically removes gas from the cooling system.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A marine air compressor cooling water temperature control and automatic degassing system is characterized by comprising a central freshwater cooler 1, a cooling water expansion tank 2, a first air compressor 3, a second air compressor 4, a self-regulating temperature control valve 5, and a cooling water degassing cylinder 6. The inlet of the central freshwater cooler 1 is connected to the cooling water expansion tank 2 through an expansion tank drain pipe 7. The first air compressor 3 and the second air compressor 4 are connected in parallel. The inlets of the first air compressor 3 and the second air compressor 4 are connected to the outlet of the self-regulating temperature control valve 5 through a cooling water inlet pipe 8. The outlet of the central freshwater cooler 1 is connected to the first inlet of the self-regulating temperature control valve 5. The outlets of the first air compressor 3 and the second air compressor 4 are respectively connected to the inlet of the cooling water degassing cylinder 6 through a cooling water outlet pipe 9. The first outlet of the cooling water degassing cylinder 6 is connected to the second inlet of the self-regulating temperature control valve 5 through a first cooling water circulation pipe 10.

[0006] Preferably, a cooling water circulation pump 11 is installed between the cooling water inlet pipe 8 and the water inlets of the first air compressor 3 and the second air compressor 4.

[0007] Preferably, a thermometer 12 is installed at the outlet of the self-operated temperature control valve 5.

[0008] Preferably, the second outlet of the cooling water degassing cylinder 6 is connected to the inlet of the central freshwater cooler 1 through the second cooling water circulation pipe 13.

[0009] Preferably, a central cooling freshwater pump 14 is installed on both the second cooling water circulation pipe 13 and the expansion tank drain pipe 7.

[0010] Preferably, a pneumatic temperature control valve 15 is also provided at the outlet of the central freshwater cooler 1. The pneumatic temperature control valve 15 is also connected to the expansion tank drain pipe 7. The pneumatic temperature control valve 15 and the self-regulating temperature control valve 5 are also connected to the inlet of the external cooling device 16 through a pipe. The outlet of the external cooling device 16 is connected to the second cooling water circulation pipe 13.

[0011] Preferably, the cooling water degassing cylinder 6 is also connected to an automatic cooling water vent valve 17.

[0012] A method for controlling the cooling water temperature and automatically degassing a marine air compressor, characterized by comprising the following steps: During normal ship operation, the cooling water expansion tank 2 outputs fresh water heated by the waste heat of the internal combustion engine through the central cooling fresh water pump 14 on the expansion tank drain pipe 7. Part of the fresh water is cooled after passing through the central fresh water cooler 1. The cooled fresh water is then adjusted in proportion with the other part of the fresh water heated by the waste heat of the internal combustion engine through the pneumatic temperature control valve 15. The fresh water output temperature of the pneumatic temperature control valve 15 is controlled at about 36°C, so that the above-mentioned output fresh water can be directly fed into the first air compressor 3 and the second air compressor 4. When the ship is docked and stopped, the temperature of the fresh water in the cooling water expansion tank 2 is low. When mixed with the water cooled by the central fresh water cooler 1, the temperature cannot reach 36°C. The high-temperature fresh water discharged from the first air compressor 3 and the second air compressor 4 enters the cooling water degassing cylinder 6 through the cooling water outlet pipe 9. The gas is removed by the cooling water automatic vent valve 17. Some of the high-temperature fresh water enters the self-regulating temperature control valve 5 through the first cooling water circulation pipe 10. The self-regulating temperature control valve 5 adjusts the ratio of low-temperature water to high-temperature water entering the air compressor, thereby controlling the temperature of the fresh water entering the first air compressor 3 and the second air compressor 4. The temperature is observed by the thermometer 12 to see if it meets the requirements of the air compressor manufacturer.

[0013] In summary, the beneficial effects of this invention are: it can maintain the temperature of the cooling water system of the ship's air compressor within the temperature range required by the manufacturer under any operating conditions, especially when the ship is moored, thereby avoiding the failure of lubricating oil emulsification and loss of lubrication effect caused by the low cooling water temperature of the air compressor due to ship mooring; at the same time, it can remove gas from the cooling water to prevent gas from affecting the normal operation of the temperature control valve. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall connection structure of the present invention. Detailed Implementation

[0015] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. These embodiments do not constitute a limitation on the present invention.

[0016] like Figure 1 The system shown is a marine air compressor cooling water temperature control and automatic degassing system, including a central freshwater cooler 1, a cooling water expansion tank 2, a first air compressor 3, a second air compressor 4, a self-regulating temperature control valve 5, and a cooling water degassing cylinder 6. The inlet of the central freshwater cooler 1 is connected to the cooling water expansion tank 2 through the expansion tank drain pipe 7. The first air compressor 3 and the second air compressor 4 are connected in parallel. The inlets of the first air compressor 3 and the second air compressor 4 are connected to the outlet of the self-regulating temperature control valve 5 through the cooling water inlet pipe 8. The outlet of the central freshwater cooler 1 is connected to the first inlet of the self-regulating temperature control valve 5. The outlets of the first air compressor 3 and the second air compressor 4 are respectively connected to the inlet of the cooling water degassing cylinder 6 through the cooling water outlet pipe 9. The first outlet of the cooling water degassing cylinder 6 is connected to the second inlet of the self-regulating temperature control valve 5 through the first cooling water circulation pipe 10.

[0017] A cooling water circulation pump 11 is installed between the cooling water inlet pipe 8 and the water inlet of the first air compressor 3 and the second air compressor 4. The cooling water circulation pump 11 can introduce fresh water that meets the water temperature requirements of the air compressor into the first air compressor 3 and the second air compressor 4.

[0018] A thermometer 12 is installed at the outlet of the self-operated temperature control valve 5, which can monitor the water temperature entering the first air compressor 3 and the second air compressor 4.

[0019] The second outlet of the cooling water degassing cylinder 6 is connected to the inlet of the central freshwater cooler 1 through the second cooling water circulation pipe 13. Excess freshwater inside the cooling water degassing cylinder 6 enters the central freshwater cooler 1 for cooling through the second cooling water circulation pipe 13.

[0020] A central cooling freshwater pump 14 is installed on both the second cooling water circulation pipe 13 and the expansion tank drain pipe 7. A pneumatic temperature control valve 15 is also installed at the outlet of the central freshwater cooler 1. The pneumatic temperature control valve 15 is also connected to the expansion tank drain pipe 7. The pneumatic temperature control valve 15 and the self-regulating temperature control valve 5 are also connected to the inlet of the external cooling equipment 16 through a pipe. The outlet of the external cooling equipment 16 is connected to the second cooling water circulation pipe 13.

[0021] The cooling water degassing cylinder 6 is also connected to an automatic cooling water vent valve 17, which can remove gas from the cooling water and prevent the gas from affecting the normal operation of the temperature control valve.

[0022] A method for controlling the cooling water temperature and automatically degassing a marine air compressor includes the following steps: During normal ship operation, the cooling water expansion tank 2 outputs fresh water heated by the waste heat of the internal combustion engine through the central cooling fresh water pump 14 on the expansion tank drain pipe 7. Part of the fresh water is cooled after passing through the central fresh water cooler 1. The cooled fresh water is then adjusted in proportion with the other part of the fresh water heated by the waste heat of the internal combustion engine through the pneumatic temperature control valve 15. The fresh water output temperature of the pneumatic temperature control valve 15 is controlled at about 36°C, so that the above-mentioned output fresh water can be directly fed into the first air compressor 3 and the second air compressor 4. When the ship is docked and stopped, the temperature of the freshwater in the cooling water expansion tank 2 is low. When mixed with the water cooled by the central freshwater cooler 1, the temperature cannot reach 36°C. The high-temperature freshwater discharged from the first air compressor 3 and the second air compressor 4 enters the cooling water degassing cylinder 6 through the cooling water outlet pipe 9. The gas is removed by the cooling water automatic vent valve 17. Some of the high-temperature freshwater enters the self-regulating temperature control valve 5 through the first cooling water circulation pipe 10. The self-regulating temperature control valve 5 adjusts the ratio of low-temperature water to high-temperature water entering the air compressor to regulate the water temperature. This controls the temperature of the freshwater entering the first air compressor 3 and the second air compressor 4, preventing the air compressor lubricating oil from emulsifying. The temperature is observed by the thermometer 12 to ensure that it meets the air compressor manufacturer's requirements. This ensures that the cooling water inlet temperature of the air compressor is maintained above the manufacturer's required value when the ship is docked, thereby preventing the air compressor lubricating oil from emulsifying due to the low cooling water temperature, which would lead to a loss of lubrication.

[0023] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within the scope of its essence and protection. Such modifications or equivalent substitutions should also be considered to fall within the protection scope of the present invention.

Claims

1. A method for controlling the cooling water temperature and automatically degassing a marine air compressor, characterized in that, The system includes a central freshwater cooler (1), a cooling water expansion tank (2), a first air compressor (3), a second air compressor (4), a self-regulating temperature control valve (5), and a cooling water degassing cylinder (6). The inlet of the central freshwater cooler (1) is connected to the cooling water expansion tank (2) through the expansion tank drain pipe (7). The first air compressor (3) and the second air compressor (4) are connected in parallel, and their inlets are connected through cooling water inlet pipes. (8) The outlet of the self-regulating temperature control valve (5) is connected to the outlet of the central freshwater cooler (1), and the outlet of the central freshwater cooler (1) is connected to the first inlet of the self-regulating temperature control valve (5). The outlets of the first air compressor (3) and the second air compressor (4) are respectively connected to the inlet of the cooling water degassing cylinder (6) through the cooling water outlet pipe (9). The first outlet of the cooling water degassing cylinder (6) is connected to the second inlet of the self-regulating temperature control valve (5) through the first cooling water circulation pipe (10). A thermometer (12) is installed at the outlet of the self-operated temperature control valve (5). The second outlet of the cooling water degassing cylinder (6) is connected to the inlet of the central freshwater cooler (1) through the second cooling water circulation pipe (13); A central cooling fresh water pump (14) is installed on both the second cooling water circulation pipe (13) and the expansion tank drain pipe (7). A pneumatic temperature control valve (15) is also installed at the outlet of the central freshwater cooler (1). The pneumatic temperature control valve (15) is also connected to the expansion tank drain pipe (7). The pneumatic temperature control valve (15) and the self-operated temperature control valve (5) are also connected to the inlet of the external cooling equipment (16) through a pipe. The outlet of the external cooling equipment (16) is connected to the second cooling water circulation pipe (13). The cooling water degassing cylinder (6) is also connected to an automatic cooling water vent valve (17). The method includes the following steps: During normal ship operation, the cooling water expansion tank (2) outputs fresh water heated by the waste heat of the internal combustion engine through the central cooling fresh water pump (14) on the expansion tank drain pipe (7). Part of the fresh water is cooled after passing through the central fresh water cooler (1). The cooled fresh water is then adjusted in proportion to the other part of the fresh water heated by the waste heat of the internal combustion engine through the pneumatic temperature control valve (15). The fresh water output temperature of the pneumatic temperature control valve (15) is controlled at about 36°C, so that the above-mentioned output fresh water can be directly fed into the first air compressor (3) and the second air compressor (4). When the ship stops running in port, the temperature of the fresh water in the cooling water expansion tank (2) is low. When mixed with the water temperature after cooling by the central fresh water cooler (1), it cannot reach 36°C. The high-temperature fresh water discharged from the first air compressor (3) and the second air compressor (4) enters the cooling water degassing cylinder (6) through the cooling water outlet pipe (9). The gas is removed by the cooling water automatic vent valve (17). Some of the high-temperature fresh water enters the self-regulating temperature control valve (5) through the first cooling water circulation pipe (10). The self-regulating temperature control valve (5) adjusts the ratio of low-temperature water to high-temperature water entering the air compressor, thereby controlling the temperature of the fresh water entering the first air compressor (3) and the second air compressor (4). The temperature is observed by the thermometer (12) to see if it meets the requirements of the air compressor manufacturer.

2. The method for controlling the cooling water temperature and automatically degassing a marine air compressor according to claim 1, characterized in that: Cooling water circulation pumps (11) are installed between the cooling water inlet pipe (8) and the inlets of the first air compressor (3) and the second air compressor (4).

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