CN112253341B - Marine diesel engine EGR cooling water system and control method of cooling water flow - Google Patents
Marine diesel engine EGR cooling water system and control method of cooling water flow Download PDFInfo
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- CN112253341B CN112253341B CN202010957589.XA CN202010957589A CN112253341B CN 112253341 B CN112253341 B CN 112253341B CN 202010957589 A CN202010957589 A CN 202010957589A CN 112253341 B CN112253341 B CN 112253341B
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- air cooler
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/23—Layout, e.g. schematics
- F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
An EGR cooling water system of a marine diesel engine comprises a cooling water return pipe, a cooling water inlet pipe, a scavenging air cooler, an EGR air cooler, a scavenging air cooler return control valve, two dynamic flow control valves, a scavenging air cooler inlet control valve, an EGR air cooler return control valve and an EGR air cooler inlet control valve; the cooling water return pipe is connected with the scavenging air cooler and the EGR air cooler through dynamic flow control valves respectively; when the cooling water enters the EGR cooling water system of the marine diesel engine during operation, the scavenging air and the recirculated exhaust gas are cooled respectively, and the two dynamic flow control valves dynamically control the return flow of the cooling water after heat exchange respectively, so that the balance of the cooling water flow of the scavenging air cooler and the EGR air cooler is achieved. The invention achieves the optimized cooling effect, improves the heat exchange efficiency of the air cooler and ensures the stable operation of the diesel engine.
Description
Technical Field
The invention relates to a cooling water system of a diesel engine, in particular to an EGR cooling water system of a marine diesel engine and a control method of cooling water flow of the EGR cooling water system, and belongs to the technical field of diesel engines.
Background
At present, due to the continuous improvement of emission requirements, the emission of nitrogen oxides can be effectively reduced by adopting an EGR (exhaust gas recirculation) system for the marine low-speed diesel engine. However, when the EGR system is configured, besides the conventional scavenging air cooler of the diesel engine, a set of EGR air cooler needs to be added correspondingly. Because the sizes of the scavenging air cooler and the EGR air cooler are different and the water demand of the scavenging air cooler and the EGR air cooler is different, a structure of the existing cooling water system is to add a throttling orifice plate in two air cooler cooling water systems. When configuring the orifice plate, it is necessary to match a correct orifice plate aperture, which requires calculations that take into account detailed component information, such as specific piping arrangements, valves, and specific data from the air cooler manufacturer, which is time consuming and laborious, and often difficult to obtain a correct flow distribution due to the difficulty in obtaining accurate information about this.
Disclosure of Invention
The invention aims to provide an EGR cooling water system of a marine diesel engine and a cooling water flow control method thereof, which solve the problem of distribution control of the EGR cooling water flow of the marine low-speed diesel engine, achieve the effects of optimizing the cooling effect, improving the heat exchange efficiency of an air cooler and ensuring the stable operation of the diesel engine.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a marine diesel engine EGR cooling water system which characterized in that: the EGR cooling water system comprises a cooling water return pipe, a cooling water inlet pipe, a scavenging air cooler, an EGR air cooler, a scavenging air cooler return water control valve, two dynamic flow control valves, a scavenging air cooler water inlet control valve, an EGR air cooler return water control valve and an EGR air cooler water inlet control valve;
the cooling water inlet pipe is a cooling water inlet conveying pipeline, the cooling water return pipe is a cooling water return conveying pipeline, the dynamic flow control valve is a cooling water flow dynamic control component, the scavenging air cooler is a scavenging air cooling component, the scavenging air cooler is connected with the cooling water inlet pipe through the scavenging air cooler inlet control valve, and is connected with the cooling water return pipe sequentially through the dynamic flow control valve and the scavenging air cooler return control valve;
when the air cooler runs, cooling water enters the EGR cooling water system of the marine diesel engine to respectively cool scavenging air and recirculated exhaust gas, and the two dynamic flow control valves respectively dynamically control the return flow of the cooling water after heat exchange to achieve the balance of the flow of the cooling water of the scavenging air cooler and the EGR air cooler, so that the heat exchange efficiency of the air cooler and the stable running of the diesel engine are ensured.
As a further improvement, the dynamic flow control valve comprises a shell and a plurality of throttling units, wherein the shell is provided with a water inlet and a water outlet, and the throttling units are accommodated in an inner cavity of the shell in a same-direction arrangement manner;
the throttling unit comprises an embedded throttling hole, a cylinder body and a spring, the cylinder body is arranged at a position, close to the water outlet, of the shell, the cylinder body is cylindrical and provided with a central hole, a spigot is arranged at the periphery of the central hole, the embedded throttling hole is a cylindrical piece with an opening at the bottom, a plurality of throttling holes are arranged on the peripheral wall, a plurality of right-angle thrust pieces are arranged at the bottom, the embedded throttling hole penetrates through the central hole of the cylinder body from the inside and can only do one-way movement of retracting into an inner cavity of the cylinder body, the spring is arranged in the inner cavity of the embedded throttling hole, and the spring pushes the embedded throttling hole outwards until the right-angle thrust pieces hook the spigot at the periphery of the central hole to position the embedded throttling hole;
the embedded throttling hole is subject to the pressure of the cooling water entering the dynamic flow control valve, overcomes the thrust of the spring and makes left and right telescopic movement in the cylinder body, thereby changing the number and the size of the throttling holes for passing through the cooling water and the area of the throttling section of the cooling water, further changing the flow and the pressure of the cooling water passing through the dynamic flow control valve and playing a role in throttling.
The other technical scheme of the invention is as follows:
a control method for the EGR cooling water flow of a marine diesel engine realized by adopting the cooling water system is characterized by comprising the following steps: when the marine diesel engine runs, the scavenging air cooler water inlet control valve and the EGR air cooler water inlet control valve are opened, meanwhile, the EGR air cooler water return control valve and the scavenging air cooler water return control valve are opened, cooling water enters the scavenging air cooler and the EGR air cooler from the cooling water inlet pipe respectively, and scavenging air and recirculating exhaust gas are cooled respectively; cooling water after heat exchange enters the dynamic flow control valve from the scavenging air cooler, when the return water flow is large, the cooling water pushes the embedded throttling hole to press into the barrel against the thrust of the spring, so that the number of the throttling holes passing through the cooling water on the embedded throttling hole is reduced, the throttling cross-sectional area is reduced, the pressure in the scavenging air cooler is increased, the flow of the cooling water entering the scavenging air cooler is reduced, and more cooling water in the cooling water inlet pipe is forced to enter the EGR air cooler through the EGR air cooler water inlet control valve; when the return water flow is small, the embedded throttling hole extends out of the barrel more by means of the elasticity of the spring, so that the number of the throttling holes passing through the cooling water on the embedded throttling hole is increased, the throttling cross-sectional area is enlarged, the pressure in the scavenging air cooler is reduced at the moment, more cooling water is enabled to be distributed into the scavenging air cooler through the EGR air cooler water inlet control valve, and the flow of the cooling water entering the scavenging air cooler is increased; similarly, the dynamic flow control valve connected with the EGR air cooler works according to the process, and the process is repeated and circulated; therefore, the two dynamic flow control valves are matched with each other to dynamically control the cooling water flow of the scavenging air cooler and the cooling water flow of the EGR air cooler and achieve balance, the best cooling effect is achieved, and the heat exchange efficiency of the air cooler and the stable operation of the diesel engine are guaranteed.
Compared with the traditional air cooler cooling water system, the invention has the beneficial effects that:
1) the system runs stably-when the diesel engine runs, the flow of cooling water of the scavenging air cooler and the EGR air cooler can be reasonably distributed, so that the aim of stabilizing the flow of the cooling water in real time is fulfilled, and the stable running of the diesel engine is ensured.
2) The cooling effect is good, the flow of cooling water of the air coolers can be dynamically adjusted to be consistent with the preset requirement, the cooling effect is good, and the heat exchange efficiency of the two air coolers is ensured.
3) The invention has wide application range, can be adopted for low-speed diesel engines for ships with EGR systems, and has wide application range.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Fig. 2 is a schematic structural diagram of a dynamic flow control valve.
Fig. 3 is a sectional view a-a of fig. 2.
Fig. 4 is a schematic view of a cartridge.
FIG. 5 is a schematic view of a nested orifice.
In the figure, 1 is a cooling water return pipe, 2 is a cooling water inlet pipe, 3 is a scavenging air cooler, 4 is an EGR air cooler, 5 is a scavenging air cooler return water control valve, 6 is a dynamic flow control valve, 7 is a scavenging air cooler inlet water control valve, 8 is an EGR air cooler return water control valve, 9 is an EGR air cooler inlet water control valve, 61 is a shell, 62 is an embedded throttling hole, 63 is a cylinder, 64 is a spring, 621 is a right-angle thrust piece, 631 is a central hole.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided for clear understanding of the structure and operation of the present invention, and is not intended to limit the scope of the present invention.
Referring to fig. 1, the EGR cooling water system of the marine diesel engine includes a cooling water return pipe 1, a cooling water inlet pipe 2, a scavenging air cooler 3, an EGR air cooler 4, a scavenging air cooler return water control valve 5, two dynamic flow control valves 6, a scavenging air cooler inlet water control valve 7, an EGR air cooler return water control valve 8, and an EGR air cooler inlet water control valve 9.
The scavenging air cooler 3 is a scavenging air cooling component and is connected with the cooling water inlet pipe 2 through the scavenging air cooler water inlet control valve 7; and the cooling water return pipe 1 is connected with the scavenging air cooler return water control valve 5 through the dynamic flow control valve 6 in sequence.
The EGR air cooler 4 is an EGR system air cooling component and is connected with the cooling water inlet pipe 2 through the EGR air cooler water inlet control valve 9; and the EGR air cooler return water control valve 8 is connected with the cooling water return pipe 1 sequentially through the dynamic flow control valve 6.
And the cooling water inlet pipe 2 is a cooling water inlet conveying pipeline and is directly connected with the scavenging air cooler inlet control valve 7 and the EGR air cooler inlet control valve 9 respectively.
And the cooling water return pipe 1 is a cooling water return conveying pipeline and is directly connected with the scavenging air cooler return water control valve 5 and the EGR air cooler return water control valve 8 respectively.
And the scavenging air cooler water inlet control valve 7 and the EGR air cooler water inlet control valve 9 are cooling water switch valve elements and are respectively and directly connected with the cooling water inlet pipe 2.
And the scavenging air cooler return water control valve 5 and the EGR air cooler return water control valve 8 are cooling water switch valve elements and are respectively and directly connected with the cooling water return pipe 1.
The dynamic flow control valve 6 is a cooling water flow dynamic control component, is a balancing device for dynamically balancing the cooling water flow of the scavenging air cooler 3 and the EGR air cooler 4, has the function of ensuring the balance of the cooling water flow of the scavenging air cooler 3 and the EGR air cooler 4, and is respectively connected between the scavenging air cooler 3 and the scavenging air cooler return water control valve 5 and between the EGR air cooler 4 and the EGR air cooler return water control valve 8.
Referring to fig. 2 and fig. 3, the dynamic flow control valve 6 includes a housing 11 and a plurality of throttling units, and the housing 11 is an outer housing portion of the dynamic flow control valve 6 and is provided with a water inlet and a water outlet. The throttle unit includes a built-in throttle hole 12, a cylinder 13, and a spring 14. The cylinder 13 is disposed at a position close to the water outlet of the housing 11, referring to fig. 4, the cylinder 13 is cylindrical, and has a central hole 631, and a stop is disposed around the central hole 631. The insertion orifice 12 is a cylindrical member with an open bottom, and referring to fig. 5, the bottom is provided with a plurality of right-angle thrust pieces 621, and the peripheral wall of the cylinder is provided with a plurality of circular orifices and single-side contracted special-shaped orifices; the insertion orifice 12 penetrates into the central hole 631 of the cylinder 13 from the inside, and the right-angle thrust piece 621 hooks the spigot of the central hole 631 to position the insertion orifice 12 in the inner cavity of the cylinder 13, wherein the insertion orifice 12 can only perform one-way movement of retracting into the inner cavity of the cylinder 13. The spring 14, which is a member that provides the dynamic flow control valve 6 with a working spring potential, is disposed in the inner cavity of the insertion orifice 12, and the spring 14 pushes the insertion orifice 12 outward until the right-angle thrust piece 621 hooks the spigot of the center hole 631 to position the insertion orifice 12. The throttling units are uniformly accommodated in the inner cavity of the shell 11 in the same-direction arrangement, the embedded throttling hole 12 is close to the water inlet of the shell 11, and the cylinder 13 is close to the water outlet.
The embedded throttle hole 12 embedded in the cylinder body 13 and the cylinder body 13 are members for adjusting pressure by changing the number and size of the throttle holes, and the components adjust the area of the throttle section through telescopic matching, thereby playing a throttling role and achieving the purpose of throttling. The insertion orifice 12 is subjected to the pressure of the cooling water entering the dynamic flow control valve 6, and can extend and contract left and right in the cylinder 13 against the urging force of the spring 14, thereby changing the number and size of orifices through which the cooling water passes, that is, changing the area of the throttling cross section of the cooling water, and thus achieving the purpose of changing the flow rate and pressure of the cooling water passing through the dynamic flow control valve 6, and performing the throttling function.
Referring to fig. 1, the principle of the flow control of the EGR cooling water of the marine low-speed diesel engine is that cooling water enters a scavenging air cooler 3 and an EGR air cooler 4 through a cooling water inlet pipe 2, and a scavenging air cooler water inlet control valve 7 and an EGR air cooler water inlet control valve 9 control the entry of the cooling water. The cooling water cools the scavenging air in the scavenging air cooler 3 and the recirculating exhaust gases in the EGR air cooler 4. The cooling water after heat exchange in the scavenging air cooler 3 enters the dynamic flow control valve 6, and the flow control is adjusted by changing the number and the aperture of the throttling holes of the dynamic flow control valve 6. After the scavenging air cooler return water control valve 5 is opened, when the return water flow is large, cooling water pushes the embedded throttling hole 12 in the dynamic flow control valve 6 to be pressed into the cylinder 13, so that the number of circular throttling hole holes passing through the cooling water on the embedded throttling hole 12 is reduced, the cross section of the special-shaped throttling hole is reduced, the pressure in the scavenging air cooler 3 is increased, the flow of the cooling water entering the scavenging air cooler 3 is reduced, and more cooling water in the cooling water inlet pipe 2 is forced to enter the EGR air cooler 4 through the EGR air cooler inlet control valve 9; when the return water flow is low, the embedded throttling hole 12 extends out of the cylinder 13 more by means of the elasticity of the spring 14, so that the number of circular throttling hole holes passing through cooling water on the embedded throttling hole 12 is increased and the section of the special-shaped throttling hole is enlarged, the pressure in the scavenging air cooler 3 is reduced at the moment, more cooling water is enabled to be distributed into the scavenging air cooler 3 by the EGR air cooler 4, the flow of the cooling water entering the scavenging air cooler 3 is increased, and the return water flow is increased. Similarly, the dynamic flow control valve 6 connected to the EGR air cooler 4 operates according to the above process, and the two dynamic flow control valves 6 are fitted to each other, thereby achieving the best cooling effect. The operation of the whole system is completed by the reciprocating circulation.
The specific working process of the invention is as follows:
when the diesel engine runs, cooling water enters from the cooling water inlet pipe 2 marine diesel engine EGR cooling water system, the scavenging air cooler water inlet control valve 7 and the EGR air cooler water inlet control valve 9 are opened, the cooling water enters the scavenging air cooler 3 and the EGR air cooler 4 respectively, the air cooling effect is exerted, the EGR air cooler water return control valve 8 and the scavenging air cooler water return control valve 5 are opened, the cooling water after heat exchange in the scavenging air cooler 3 and the EGR air cooler 4 is dynamically controlled by the two dynamic flow control valves 6 respectively, and the flow balance of two different air coolers is achieved. The whole system work is finished in a reciprocating mode.
The above description is only a preferred embodiment of the present invention, and it should be noted that various equivalent modifications, changes and adaptations made by those skilled in the art according to the present application shall be considered to be the scope of the present invention.
Claims (2)
1. The utility model provides a marine diesel engine EGR cooling water system which characterized in that: the EGR cooling water system comprises a cooling water return pipe, a cooling water inlet pipe, a scavenging air cooler, an EGR air cooler, a scavenging air cooler return water control valve, two dynamic flow control valves, a scavenging air cooler water inlet control valve, an EGR air cooler return water control valve and an EGR air cooler water inlet control valve;
the cooling water inlet pipe is a cooling water inlet conveying pipeline, the cooling water return pipe is a cooling water return conveying pipeline, the dynamic flow control valve is a cooling water flow dynamic control component, the scavenging air cooler is a scavenging air cooling component, the scavenging air cooler is connected with the cooling water inlet pipe through the scavenging air cooler inlet control valve, and is connected with the cooling water return pipe sequentially through the dynamic flow control valve and the scavenging air cooler return control valve;
the dynamic flow control valve comprises a shell and a plurality of throttling units, wherein the shell is provided with a water inlet and a water outlet, and the throttling units are accommodated in an inner cavity of the shell in a same-direction arrangement manner;
the throttling unit comprises an embedded throttling hole, a cylinder body and a spring, the cylinder body is arranged at a position, close to the water outlet, of the shell, the cylinder body is cylindrical and provided with a central hole, a spigot is arranged at the periphery of the central hole, the embedded throttling hole is a cylindrical piece with an opening at the bottom, a plurality of throttling holes are arranged on the peripheral wall, a plurality of right-angle thrust pieces are arranged at the bottom, the embedded throttling hole penetrates through the central hole of the cylinder body from the inside and can only do one-way movement of retracting into an inner cavity of the cylinder body, the spring is arranged in the inner cavity of the embedded throttling hole, and the spring pushes the embedded throttling hole outwards until the right-angle thrust pieces hook the spigot at the periphery of the central hole to position the embedded throttling hole;
the embedded throttling hole is subject to the pressure of cooling water entering the dynamic flow control valve, overcomes the thrust of the spring and makes left and right telescopic movement in the cylinder body, so that the number and the size of the throttling holes for passing through the cooling water and the area of the throttling section of the cooling water are changed, the flow and the pressure of the cooling water passing through the dynamic flow control valve are changed, and the throttling function is realized;
when the air cooler runs, cooling water enters the EGR cooling water system of the marine diesel engine to respectively cool scavenging air and recirculated exhaust gas, and the two dynamic flow control valves respectively dynamically control the return flow of the cooling water after heat exchange to achieve the balance of the flow of the cooling water of the scavenging air cooler and the EGR air cooler, so that the heat exchange efficiency of the air cooler and the stable running of the diesel engine are ensured.
2. A method for controlling the flow rate of EGR cooling water of a marine diesel engine by using the cooling water system of claim 1, wherein the method comprises the steps of: when the marine diesel engine runs, the scavenging air cooler water inlet control valve and the EGR air cooler water inlet control valve are opened, meanwhile, the EGR air cooler water return control valve and the scavenging air cooler water return control valve are opened, cooling water enters the scavenging air cooler and the EGR air cooler from the cooling water inlet pipe respectively, and scavenging air and recirculating exhaust gas are cooled respectively; cooling water after heat exchange enters the dynamic flow control valve from the scavenging air cooler, when the return water flow is large, the cooling water pushes the embedded throttling hole to press into the barrel against the thrust of the spring, so that the number of the throttling holes passing through the cooling water on the embedded throttling hole is reduced, the throttling cross-sectional area is reduced, the pressure in the scavenging air cooler is increased, the flow of the cooling water entering the scavenging air cooler is reduced, and more cooling water in the cooling water inlet pipe is forced to enter the EGR air cooler through the EGR air cooler water inlet control valve; when the return water flow is small, the embedded throttling hole extends out of the barrel more by means of the elasticity of the spring, so that the number of the throttling holes passing through the cooling water on the embedded throttling hole is increased, the throttling cross-sectional area is enlarged, the pressure in the scavenging air cooler is reduced at the moment, more cooling water is enabled to be distributed into the scavenging air cooler through the EGR air cooler water inlet control valve, and the flow of the cooling water entering the scavenging air cooler is increased; similarly, the dynamic flow control valve connected with the EGR air cooler works according to the process, and the process is repeated and circulated; therefore, the two dynamic flow control valves are matched with each other to dynamically control the cooling water flow of the scavenging air cooler and the cooling water flow of the EGR air cooler and achieve balance, the best cooling effect is achieved, and the heat exchange efficiency of the air cooler and the stable operation of the diesel engine are guaranteed.
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| CN202010957589.XA CN112253341B (en) | 2020-09-14 | 2020-09-14 | Marine diesel engine EGR cooling water system and control method of cooling water flow |
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| CN202010957589.XA CN112253341B (en) | 2020-09-14 | 2020-09-14 | Marine diesel engine EGR cooling water system and control method of cooling water flow |
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| CN112253341B true CN112253341B (en) | 2022-03-29 |
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| CN101813197A (en) * | 2009-02-25 | 2010-08-25 | 西门子（中国）有限公司 | Flow control valve |
| EP2518300A1 (en) * | 2011-04-06 | 2012-10-31 | Pierburg GmbH | Waste gas recovery cooling module |
| CN103119280A (en) * | 2010-07-22 | 2013-05-22 | 威斯卡特工业有限公司 | Exhaust heat recovery system with bypass |
| CN103697719A (en) * | 2013-12-30 | 2014-04-02 | 国核华清（北京）核电技术研发中心有限公司 | Parallel multi-branch cooling water distribution and adjustment system |
| CN206419126U (en) * | 2016-09-09 | 2017-08-18 | 现代自动车株式会社 | The cooler for recycled exhaust gas of water cooling |
| CN110546365A (en) * | 2017-04-06 | 2019-12-06 | 通用全球采购有限责任公司 | Method and system for a multi-stage exhaust gas cooler |
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2020
- 2020-09-14 CN CN202010957589.XA patent/CN112253341B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1137335A (en) * | 1997-07-17 | 1999-02-12 | Denso Corp | Flow control valve |
| CN101813197A (en) * | 2009-02-25 | 2010-08-25 | 西门子（中国）有限公司 | Flow control valve |
| CN103119280A (en) * | 2010-07-22 | 2013-05-22 | 威斯卡特工业有限公司 | Exhaust heat recovery system with bypass |
| EP2518300A1 (en) * | 2011-04-06 | 2012-10-31 | Pierburg GmbH | Waste gas recovery cooling module |
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