CN218439560U - Exhaust gas recycling system and engine assembly - Google Patents
Exhaust gas recycling system and engine assembly Download PDFInfo
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- CN218439560U CN218439560U CN202222991727.3U CN202222991727U CN218439560U CN 218439560 U CN218439560 U CN 218439560U CN 202222991727 U CN202222991727 U CN 202222991727U CN 218439560 U CN218439560 U CN 218439560U
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- exhaust gas
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- 238000004064 recycling Methods 0.000 title claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000002156 mixing Methods 0.000 claims abstract description 16
- 238000001914 filtration Methods 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 12
- 239000003921 oil Substances 0.000 claims description 11
- 230000002000 scavenging effect Effects 0.000 claims description 5
- 238000011010 flushing procedure Methods 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 2
- 239000000945 filler Substances 0.000 abstract description 5
- 125000004122 cyclic group Chemical group 0.000 abstract description 3
- 239000008187 granular material Substances 0.000 abstract description 2
- 238000005201 scrubbing Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 120
- 239000012528 membrane Substances 0.000 description 13
- 238000005406 washing Methods 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- 239000002912 waste gas Substances 0.000 description 7
- 239000000446 fuel Substances 0.000 description 5
- 238000011001 backwashing Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 230000005587 bubbling Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Exhaust-Gas Circulating Devices (AREA)
Abstract
The utility model relates to a low-speed engine technical field specifically discloses an exhaust gas cyclic utilization system and engine assembly, this exhaust gas cyclic utilization system includes the low-speed engine, turbo charger, the three-way valve, the exhaust emission pipeline, exhaust gas circulation pipeline, the filter, cooler and gas mixing device, engine exhaust tail gas can be through the turbine of turbo charger behind its whole exhaust emission pipelines that gets into of three-way valve control, or partly get into the exhaust emission pipeline, another part gets into the exhaust gas circulation pipeline, and pass through the filter in proper order, cooler and gas mixing device get into the compressor, then carry to the engine, through the granule in the filter flow-through gas, water and oil, and cool off the gas of flowing through the cooler, the present filler scrubbing tower of fungible, and can effectively reduce the space and occupy, be convenient for use on the ship.
Description
Technical Field
The utility model relates to a low-speed engine technical field especially relates to an exhaust gas recycling system and engine assembly.
Background
Exhaust Gas Recirculation (EGR) is a method of reducing NOx emissions when a low speed engine is operated at low loads. In gas mode, the EGR system operates by recirculating unburned fuel back into the combustion chamber. In a low pressure EGR system, the flow control device is located downstream of the turbocharger, and exhaust gas from the low speed engine is split into two paths, one path being discharged along the normal exhaust gas discharge line of the low speed engine, and the other path flowing into an Exhaust Gas Recirculation (EGR) system, the flow distribution of the two paths must be controlled according to the load of the low speed engine and the desired balance characteristics of the EGR system.
However, the exhaust gas of the low-speed engine is high in temperature and contains solid particles generated by fuel combustion and partially unburned fuel, so that the exhaust gas cannot be directly circulated into the compressor of the low-speed engine and then enters the scavenging box through the air cooler. Therefore, the exhaust gas needs to be cleaned in advance.
At present, a plurality of cooling towers in the forms of fixed packing, bubbling, empty towers and the like are used as products of exhaust gas cooling and dust removing equipment of a low-pressure EGR system of a low-speed engine, but the application field of the low-speed engine for a ship faces the problem of space limitation on the ship, particularly, the low-pressure EGR washing equipment is limited by flooding due to low pressure of treated exhaust gas, large volume flow, common packing washing towers and difficulty in reducing the volume of the equipment, and is the biggest obstacle for realizing the on-board application of the low-pressure EGR equipment.
Therefore, there is a need for an exhaust gas recycling system that meets the space requirements of a marine low speed engine.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an: the utility model provides an exhaust gas cyclic utilization system and engine assembly to solve among the prior art, cool off and remove dust for the exhaust gas of low pressure EGR system through the cooling tower, the problem that the volume is too big, is difficult to use on the ship.
In one aspect, the utility model provides an exhaust gas recycling system, this exhaust gas recycling system includes:
a low speed engine;
the turbocharger comprises a gas compressor and a turbine in transmission connection with the gas compressor, the input end of the turbine is connected with an exhaust manifold of the low-speed engine, and the output end of the gas compressor is connected with a scavenging box of the low-speed engine;
a three-way valve having a first port connected to an output end of the turbine, a second port connected to an exhaust gas discharge line for delivering gas to the outside, and a third port connected to an exhaust gas circulation line connected to an input end of the compressor, the first port being configured to be always in communication with the second port and to be selectively in communication with the third port;
the filter is arranged in the exhaust gas circulation pipeline and is used for filtering particles, water and oil in the gas flowing through;
the gas mixing device is arranged in the waste gas circulating pipeline, is positioned at the downstream of the filter along the flowing direction of gas in the waste gas circulating pipeline and is used for mixing fresh air with the gas in the waste gas circulating pipeline;
and the cooler is arranged on the waste gas circulating pipeline and is positioned between the filter and the gas mixing device.
As a preferable technical solution of the exhaust gas recycling system, the exhaust gas recycling system further includes a water separator provided in the exhaust gas circulation line, the water separator is located downstream of the cooler along a flow direction of the gas in the exhaust gas circulation line, and the water separator is configured to separate water from the gas flowing therethrough.
As a preferable mode of the exhaust gas recycling system, the exhaust gas recycling system further includes an economizer provided in the exhaust gas circulation line, the economizer being located upstream of the filter in a flow direction of the gas in the exhaust gas circulation line.
As a preferred embodiment of the exhaust gas recycling system, a backwashing device is integrated into the filter, and the backwashing device is used for washing away particles attached to the surface of the filter element of the filter.
As a preferred embodiment of the exhaust gas recirculation system, a differential pressure sensor is further integrated in the filter, and the differential pressure sensor is used for detecting a pressure difference between an input end of the filter and an output end of the filter.
As a preferred technical solution of the exhaust gas recycling system, the exhaust gas recycling system further comprises a collecting container connected to the filter, and the collecting container is used for collecting the particles, water and oil filtered out by the filter.
As a preferable embodiment of the exhaust gas recycling system, a flow rate of the gas entering the third port is not higher than 60% of a flow rate of the gas entering the first port.
As a preferred solution of the exhaust gas recycling system, the exhaust gas discharge line is used for conveying gas to the boiler.
On the other hand, the utility model provides an engine assembly, exhaust gas recycling utilizes the system in above-mentioned arbitrary scheme.
The beneficial effects of the utility model are that:
the utility model provides an exhaust gas circulation utilizes system and engine assembly, this exhaust gas circulation utilizes system pass through the filter and filter granule, water and the oil in the gas of flowing through to cool off the gas of flowing through the cooler, the current filler scrubbing tower of fungible can effectively reduce the space and occupy under the prerequisite of guaranteeing filter effect and under the prerequisite of cooling effect, is convenient for use on boats and ships.
Drawings
Fig. 1 is a schematic structural diagram of an exhaust gas recycling system according to an embodiment of the present invention.
In the figure:
1. a low speed engine; 2. a turbocharger; 21. a turbine; 22. a compressor; 3. a three-way valve; 4. an exhaust gas discharge line; 5. an exhaust gas circulation line; 6. a filter; 7. a cooler; 8. a gas mixing device; 9. a water separator; 10. a collection container; 11. an economizer.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, 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. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the prior art, a cooling tower in the forms of a fixed filler type, a bubbling type, an empty tower and the like is generally used for cooling and dedusting exhaust gas of a low-pressure EGR system of a low-speed engine, but the application field of a low-speed engine for a ship faces the problem of space limitation on the ship, and particularly, a low-pressure EGR washing device is the biggest obstacle for realizing the application of the low-pressure EGR device on the ship because the pressure of the treated exhaust gas is low, the volume flow is large, the common filler washing tower is limited by flooding, and the volume of the device is difficult to reduce. The low-speed engine generally refers to an engine with the maximum torque of about 3000 revolutions, and has large torque and strong drag force.
In view of the above, the present embodiment provides an exhaust gas recycling system to solve the above problems, which is applicable to an engine assembly adapted to be mounted on a ship.
Specifically, as shown in fig. 1, the exhaust gas recycling system includes a low-speed engine 1, a turbocharger 2, a three-way valve 3, an exhaust gas discharge line 4, an exhaust gas circulation line 5, a filter 6, a cooler 7, and a gas mixing device 8.
The three-way valve 3 has a first port, a second port and a third port, wherein the first port is configured to be always communicated with the second port and selectively communicated with the third port. Specifically, the flow rate of the gas into the third port is not higher than 60% of the flow rate of the gas into the first port. Of course, in other embodiments, the flow of the gas into the third port may be adjusted as needed. Among them, the three-way valve 3 is preferably an electrically controlled valve.
The turbocharger 2 includes a compressor 22 and a turbine 21 drivingly connected to the compressor 22. The turbine 21 is coaxial with the compressor 22 and each carries an impeller. The exhaust gas discharged by the engine can drive the impeller of the turbine 21 to rotate, and then the impeller of the compressor 22 is driven to rotate coaxially, so that the fresh air or the mixed gas of the exhaust gas discharged by part of the engine and the fresh air is compressed and then is conveyed to the engine, the air input of the engine can be increased, the full combustion reaction is ensured, and the utilization rate of the fuel is improved.
Specifically, the input end of the turbine 21 is connected with the exhaust manifold of the low-speed engine 1, the output end of the turbine 21 is connected with a first interface, a second interface is connected with the exhaust gas discharge pipeline 4, and the exhaust gas discharge pipeline 4 is used for conveying gas to the outside; the third interface is connected with a waste gas circulating pipeline 5, the waste gas circulating pipeline 5 is connected with the input end of a compressor 22, and the output end of the compressor 22 is connected with a scavenging box of the low-speed engine 1; the gas entering the scavenging box can enter the cylinder through the engine intake manifold to participate in the reaction. The exhaust gas discharged from the engine can be selectively outputted to the outside through the exhaust gas discharge line 4 by the three-way valve 3, or a part of the exhaust gas discharged from the engine is outputted to the outside through the exhaust gas discharge line 4 and the other part is sent to the exhaust gas circulation line 5.
In this embodiment, a filter 6, a cooler 7 and a gas mixing device 8 are disposed in the exhaust gas circulation line 5 and are sequentially disposed along the flow direction of the gas in the exhaust gas circulation line 5, wherein the filter 6 is used for filtering particles, water and oil in the gas flowing through, the cooler 7 is used for cooling the gas flowing through, and the gas mixing device 8 is used for mixing fresh air with the gas in the exhaust gas circulation line 5.
The waste gas recycling system provided by the embodiment filters particles, water and oil in gas flowing through the filter 6, and cools the gas flowing through the cooler 7, so that the system can replace the existing filler washing tower, effectively reduce the occupied space and is convenient to apply to a ship.
Specifically, in the present embodiment, the filter 6 may be a membrane type or honeycomb type filter element, for example, a membrane type filter element, which blocks the passage of the particulates, oil and water, but allows the gas to pass through, so that the particulates, oil and water can be blocked at the front end of the filter membrane. Compared with the common contact type washing equipment, the flow-rate-limiting type washing equipment has no limitation of flow factors, the volume of the equipment can be effectively reduced, and the filtering membrane with the proper filtering diameter can effectively filter the particulate matters reaching the level of 0.1-1 micron in the engine tail gas, so that the particulate matters are prevented from being accumulated on the impeller of the air compressor 22 and the fins of the cooler 7.
Optionally, a back-flushing device (not shown in the figures) is integrated in the filter 6, which back-flushing device is used to flush out particles adhering to the surface of the filter element of the filter 6. The back washing device comprises a nozzle positioned at the rear end of the filtering membrane, a high-pressure air source for supplying air to the nozzle, an air pipe for connecting the high-pressure air source and the nozzle, and a control valve arranged on the air pipe and used for controlling the opening or closing of the air pipe. Through spraying high-pressure gas to filtering membrane, can blow off the particulate matter that adheres to filtering membrane front end surface, avoid blockking up filtering membrane. Preferably, a differential pressure sensor (not shown in the drawings) is also integrated in the filter 6, for detecting the pressure difference between the input of the filter 6 and the output of the filter 6. By comparing the detected pressure difference with a threshold value (such as 500 pa), if the detected pressure difference exceeds the threshold value, the blockage of the filtering membrane is serious at the moment, the filtering membrane needs to be flushed, the control valve can be opened, and when the detected pressure difference is smaller than the threshold value, the filtering membrane can still normally work on the surface at the moment without backwashing.
Optionally, the exhaust gas recycling system further comprises a collecting container 10 connected to the filter 6, the collecting container 10 being used for collecting the particles, water and oil filtered by the filter 6, wherein the collecting container 10 and the filter 6 are sealed containers to prevent the gas flowing through from leaking. In this embodiment, the collection container 10 is in communication with the front end space of the filter membrane, so that particles, water and oil filtered out from the surface of the filter membrane can enter the collection container 10 for storage. Preferably, the collecting container 10 is detachably connected to the strainer 6, facilitating the cleaning of the collecting container 10 from impurities.
The cooler 7 is preferably a fin cooler 7, and the gas flowing therethrough is heat-exchanged by cooling water to lower the temperature of the gas. Specifically, the cooler 7 can reduce the temperature of the gas flowing through to 35-45 ℃, and condensed water is easily generated in the gas due to the temperature angle of the gas being lower than the dew point of the gas, and preferably, the exhaust gas recycling system further comprises a water separator 9 arranged in the exhaust gas circulation line 5, wherein the water separator 9 is located downstream of the cooler 7 and upstream of the gas mixing device 8 along the flow direction of the gas in the exhaust gas circulation line 5, and the water separator 9 is used for separating water from the gas flowing through. Wherein, water separator 9 is prior art, and its specific structure is not repeated.
Optionally, the exhaust gas recycling system further comprises an economizer 11 disposed in the exhaust gas circulation line 5, the economizer 11 being located upstream of the filter 6 in the flow direction of the gas in the exhaust gas circulation line 5. The economizer 11 can fully absorb heat energy in gas flowing through and heat cold water to provide high-temperature steam-water mixture for the ship, reduce the temperature of the gas to a certain extent and effectively improve the utilization rate of fuel. The economizer 11 is a conventional economizer, and the structure thereof is not described herein again.
Optionally, an exhaust gas discharge line 4 is used for conveying the gas to a boiler (not shown in the figures). The boiler can be heated by the heat energy in the tail gas, and the heat energy in the tail gas is fully utilized.
The embodiment also provides an engine assembly which comprises the exhaust gas recycling system.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. An exhaust gas recycling system, comprising:
a low-speed engine (1);
the turbocharger (2) comprises a compressor (22) and a turbine (21) in transmission connection with the compressor (22), the input end of the turbine (21) is connected with an exhaust manifold of the low-speed engine (1), and the output end of the compressor (22) is connected with a scavenging box of the low-speed engine (1);
a three-way valve (3), the three-way valve (3) having a first interface, a second interface and a third interface, the first interface is connected with the output end of the turbine (21), the second interface is connected with an exhaust gas discharge pipeline (4), the exhaust gas discharge pipeline (4) is used for conveying gas to the outside, the third interface is connected with an exhaust gas circulation pipeline (5), the exhaust gas circulation pipeline (5) is connected with the input end of the compressor (22), and the first interface is configured to be always communicated with the second interface and selectively communicated with the third interface;
a filter (6) disposed in the exhaust gas circulation line (5), wherein the filter (6) is used for filtering particles, water and oil in the gas flowing through;
the gas mixing device (8) is arranged in the exhaust gas circulation pipeline (5), the gas mixing device (8) is positioned at the downstream of the filter (6) along the flowing direction of the gas in the exhaust gas circulation pipeline (5), and the gas mixing device (8) is used for mixing fresh air with the gas in the exhaust gas circulation pipeline (5);
and the cooler (7) is arranged on the exhaust gas circulating pipeline (5) and is positioned between the filter (6) and the gas mixing device (8).
2. The exhaust gas recirculation system according to claim 1, characterized by further comprising a water separator (9) arranged in the exhaust gas recirculation line (5), the water separator (9) being located downstream of the cooler (7) in the flow direction of the gas in the exhaust gas recirculation line (5), the water separator (9) being configured to separate water from the gas flowing therethrough.
3. The exhaust gas recirculation system according to claim 1, characterized in that it further comprises an economizer (11) arranged in the exhaust gas recirculation line (5), the economizer (11) being located upstream of the filter (6) in the flow direction of the gas in the exhaust gas recirculation line (5).
4. The exhaust gas recirculation system according to claim 1, characterized in that a back-flushing device is integrated in the filter (6) for flushing away particles adhering to the filter element surface of the filter (6).
5. The exhaust gas recirculation system according to claim 4, characterized in that a differential pressure sensor is also integrated in the filter (6) for detecting a pressure difference between the input of the filter (6) and the output of the filter (6).
6. An exhaust gas recycling system according to claim 4, characterized in that the exhaust gas recycling system further comprises a collecting container (10) connected to the filter (6), said collecting container (10) being adapted to collect particles, water and oil filtered by the filter (6).
7. The exhaust gas recirculation system of claim 1, wherein a flow rate of gas entering the third interface is no higher than 60% of a flow rate of gas entering the first interface.
8. Exhaust gas recycling system according to claim 1, characterized in that the exhaust gas discharge line (4) is used for conveying gas to a boiler.
9. An engine assembly comprising an exhaust gas recirculation system according to any of claims 1-8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222991727.3U CN218439560U (en) | 2022-11-10 | 2022-11-10 | Exhaust gas recycling system and engine assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222991727.3U CN218439560U (en) | 2022-11-10 | 2022-11-10 | Exhaust gas recycling system and engine assembly |
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| Publication Number | Publication Date |
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| CN218439560U true CN218439560U (en) | 2023-02-03 |
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| CN202222991727.3U Active CN218439560U (en) | 2022-11-10 | 2022-11-10 | Exhaust gas recycling system and engine assembly |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115559836A (en) * | 2022-11-10 | 2023-01-03 | 中船动力研究院有限公司 | Exhaust gas recycling system and engine assembly |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115559836A (en) * | 2022-11-10 | 2023-01-03 | 中船动力研究院有限公司 | Exhaust gas recycling system and engine assembly |
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