CN210343536U - Medium-pressure exhaust gas low-pressure side introducing system based on two-stage turbocharger - Google Patents
Medium-pressure exhaust gas low-pressure side introducing system based on two-stage turbocharger Download PDFInfo
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- CN210343536U CN210343536U CN201920628624.6U CN201920628624U CN210343536U CN 210343536 U CN210343536 U CN 210343536U CN 201920628624 U CN201920628624 U CN 201920628624U CN 210343536 U CN210343536 U CN 210343536U
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Abstract
The utility model discloses a middling pressure waste gas low pressure side induction system based on two-stage turbo charger, including the engine, high-pressure stage turbo charger and low-pressure stage turbo charger, inlet manifold and exhaust manifold are connected to the engine, high-pressure stage turbo charger includes high-pressure stage exhaust turbine and high-pressure stage compressor, low-pressure stage turbo charger includes low-pressure stage exhaust turbine and low-pressure stage compressor, inlet manifold connects the air inlet pipeline, exhaust manifold connects the exhaust pipe, the air inlet pipeline sets up the check valve, low-pressure stage compressor, high-pressure stage compressor and air inlet intercooler, the exhaust pipe sets up high-pressure stage exhaust turbine, low-pressure stage exhaust turbine, aftertreatment ware and back pressure valve; and an intermediate-pressure EGR pipeline is connected between the outlet of the high-pressure stage exhaust gas turbine and the inlet of the low-pressure stage compressor, and an EGR cooler, an EGR valve and a particulate matter trap are arranged on the intermediate-pressure EGR pipeline. The utility model discloses can not only enlarge the introduction scope of EGR rate, can also improve the efficiency of engine, reduce and discharge.
Description
Technical Field
The utility model belongs to the technical field of the clean burning of diesel engine, more specifically say so, relate to a middling pressure waste gas low pressure side induction system based on two-stage turbo charger.
Background
Modern emission regulations are becoming more stringent and reducing exhaust emissions from engines is a necessary trend in the future, with emission control of NOx and particulate matter being most stringent. When the engine works, NOx is easily generated in a high-temperature oxygen-rich area when fuel in a cylinder burns, and in order to reduce NOx emission, the oxygen concentration in the cylinder and the maximum combustion temperature are controlled. Technologies that can effectively reduce NOx emissions from engines currently include Exhaust Gas Recirculation (EGR), Selective Catalytic Reduction (SCR) aftertreatment, and water-blended combustion. The EGR technology is characterized in that a part of exhaust gas discharged by an engine is introduced into an air inlet pipe, mixed with fresh air and then enters an air cylinder to participate in combustion again, so that the effects of reducing the combustion temperature and the oxygen concentration are achieved, and the NOx emission of the engine is further reduced.
The current EGR technology is mainly classified into a high pressure EGR technology and a low pressure EGR technology. The high-pressure EGR technology is that gas is taken from the front end of a turbine of a supercharger of an engine, enters an air inlet pipe of the engine after passing through an EGR cooler and an EGR valve, is mixed with fresh air and then enters an engine cylinder; the low-pressure EGR technology is that gas is taken from a post-processing device of supercharger turbine exhaust, enters the front end of a low-pressure stage compressor after passing through an EGR cooler and an EGR valve to be mixed with fresh air, and enters an engine cylinder after being pressurized. These two EGR techniques use different methods of exhaust gas introduction, with their inherent advantages and disadvantages and operating conditions in a range suitable for operation: for high-pressure EGR, a loop is short, the transient response speed is high, but the supercharged intake pressure is higher than the exhaust pressure before the vortex when the load is high, and EGR is difficult to introduce by simply opening an EGR valve, so that the high-pressure EGR is suitable for being used under a low-load working condition, and meanwhile, the energy of exhaust gas entering a turbine is reduced by taking gas before the vortex, and the operation efficiency of a turbocharger is influenced; compared with high-pressure EGR, low-pressure EGR gas taking after the vortex has smaller required preswirl pressure at high speed and high load, smaller pumping loss of an engine, and easy introduction of exhaust gas to generate larger EGR rate.
In summary, in order to meet increasingly strict legislative requirements, it is necessary to solve the problems of difficult arrangement of the existing low-pressure EGR system and difficult introduction of exhaust gas under a large load of the high-pressure EGR system.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming not enough among the prior art, providing a middling pressure waste gas low pressure side induction system based on two-stage turbo charger, not only can enlarge the introduction scope of EGR rate, still compromise the requirement of engine to EGR under the different loads, improve the efficiency of engine, reduce and discharge.
The purpose of the utility model is realized through the following technical scheme.
The utility model discloses middling pressure waste gas low pressure side induction system based on two-stage turbo charger, including engine, high-pressure stage turbo charger and low-pressure stage turbo charger, the engine is connected with air intake manifold and exhaust manifold, high-pressure stage turbo charger includes coaxial pivoted high-pressure stage exhaust turbine and high-pressure stage compressor, low-pressure stage turbo charger includes coaxial pivoted low-pressure stage exhaust turbine and low-pressure stage compressor, air intake manifold is connected with the air inlet pipeline, exhaust manifold is connected with the exhaust pipe, check valve, low-pressure stage compressor, high-pressure stage compressor and the intercooler that admits air set gradually along the direction of admitting air on the air intake pipeline, high-pressure stage exhaust turbine, low-pressure stage exhaust turbine, aftertreatment ware and back pressure valve set gradually along the direction of exhausting on the exhaust pipe;
a middle-pressure EGR pipeline is connected between the outlet of the high-pressure stage exhaust gas turbine and the inlet of the low-pressure stage compressor, an EGR cooler, an EGR valve and a particulate matter trap are arranged on the middle-pressure EGR pipeline, and the EGR valve is arranged between the EGR cooler and the particulate matter trap; the outlet of the EGR cooler is connected with the inlet pipeline of the low-pressure stage compressor, and the inlet of the EGR cooler is connected with the EGR valve; the inlet of the particulate matter catcher is connected with the outlet pipeline of the high-pressure-stage exhaust turbine, and the outlet of the particulate matter catcher is connected with the EGR valve.
The inlet end of the medium-pressure EGR pipeline is communicated with the outlet (or inlet) of the high-pressure stage exhaust turbine, and the outlet end of the medium-pressure EGR pipeline is communicated with the inlet pipeline of the low-pressure stage compressor.
The EGR valve is an electric control valve, and the opening degree of the EGR valve is adjusted by detecting the operation condition of the engine through the ECU so as to obtain different EGR rates.
The medium-pressure waste gas is led out from the outlet pipeline of the high-pressure stage waste gas turbine (or the inlet pipeline of the low-pressure stage waste gas turbine), flows into the inlet pipeline of the low-pressure stage compressor after passing through a particulate matter trap, an EGR valve and an EGR cooler, is mixed with fresh air and enters the engine after being supercharged and cooled by the two-stage compressor, and the high EGR rate is realized.
Compared with the prior art, the utility model discloses a beneficial effect that technical scheme brought is:
(1) compared with the traditional high-pressure EGR system, the utility model discloses waste gas is got from the export of high-pressure stage exhaust gas turbine, is the middling pressure waste gas after high-pressure stage exhaust gas turbine absorbs partial energy, and the temperature reduces to some extent, has improved the reliability of pipeline, has avoided simultaneously getting gas before the whirlpool and has brought more energy loss, has guaranteed that high-pressure stage turbine operates regional at the high efficiency, obtains better oil consumption level.
(2) Even if the engine runs under a large load, the pressure of the exhaust gas at the outlet of the high-pressure stage turbine is still higher than the pressure at the inlet of the low-pressure stage compressor (namely the atmospheric pressure, and the pressure at the position is low pressure on an air inlet pipeline of the engine), so that the reliable introduction of the exhaust gas can be ensured under the large load, a larger EGR rate is realized, and the defect that the EGR cannot be introduced due to the high inlet pressure of a high-pressure EGR system under the large load working condition is overcome.
(3) Compare with traditional low pressure EGR system, the utility model discloses take out middling pressure waste gas at the outlet pipeline of high-pressure stage turbine, the whole car of pipeline is arranged conveniently, does not have the whole car pipeline that low pressure EGR system got behind the after-treatment device and leads to and arranges the shortcoming of difficulty.
(4) The utility model discloses applied the particulate matter trap on the middling pressure EGR pipeline, purified the waste gas that gets into in the EGR system, reduced the pollution to the EGR system, turbocharging system and engine, improved the reliability of the whole operation of engine.
Drawings
Fig. 1 is a schematic diagram of a medium-pressure exhaust gas low-pressure side introducing system based on a two-stage turbocharger.
Reference numerals: 1, an air inlet manifold, 2 engines, 3 air inlet intercoolers, 4 high-pressure stage turbochargers, 5 low-pressure stage turbochargers, 6 one-way valves, 7EGR coolers, 8 backpressure valves, 9 post-processors, 10EGR valves, 11 particulate matter traps, 12 medium-pressure EGR pipelines and 13 exhaust manifolds;
h.turbo high pressure stage exhaust gas turbine, h.comp high pressure stage compressor, l.turbo low pressure stage exhaust gas turbine, l.comp low pressure stage compressor.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, detailed descriptions of embodiments of the present invention are provided below with reference to the accompanying drawings, so that the above and other objects, features and advantages of the present invention will be more clear. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention. The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the utility model discloses middling pressure waste gas low pressure side induction system based on two-stage turbo charger, including engine 2, high-pressure stage turbo charger 4 and low-pressure stage turbo charger 5, engine 2 is connected with inlet manifold 1 and exhaust manifold 13, inlet manifold 1 is connected with the air inlet pipeline, exhaust manifold 13 is connected with the exhaust pipe. High-pressure stage turbocharger 4 includes coaxial pivoted high-pressure stage exhaust gas turbine H.turb and high-pressure stage compressor H.Comp, low-pressure stage turbocharger 5 includes coaxial pivoted low-pressure stage exhaust gas turbine L.turb and low-pressure stage compressor L.Comp, and the turbine all sets up on the exhaust pipe way behind engine 2's exhaust manifold 13, and the compressor all sets up on the intake pipe way before engine 2's intake manifold 1.
The air inlet pipeline is sequentially provided with a one-way valve 6, a low-pressure stage compressor L.Comp, a high-pressure stage compressor H.Comp and an air inlet intercooler 3 along the air inlet direction. And the exhaust pipeline is sequentially provided with a high-pressure stage exhaust gas turbine H.Turb, a low-pressure stage exhaust gas turbine L.Turb, an aftertreatment device 9 and a backpressure valve 8 along the exhaust direction.
A medium-pressure EGR pipeline 12 is connected between the outlet of the high-pressure stage exhaust gas turbine and the inlet of the low-pressure stage compressor, and an EGR cooler 7, an EGR valve 10 and a particulate matter trap 11 are arranged on the medium-pressure EGR pipeline 12 to form a medium-pressure EGR system. The inlet end of the medium-pressure EGR pipeline 12 is communicated with the outlet (or inlet) of the high-pressure stage exhaust turbine, and the outlet end is communicated with the inlet pipeline of the low-pressure stage compressor. The outlet of the EGR cooler 7 is connected with the inlet pipeline of the low-pressure compressor, and the inlet of the EGR cooler is connected with the EGR valve 10, so that the middle-pressure waste gas is cooled, and the proper charge density is ensured. The EGR valve 10 is arranged between the EGR cooler 7 and the particulate matter trap 11, two ends of the EGR valve are connected with an inlet of the EGR cooler 7 and an outlet of the particulate matter trap 11, different EGR rates can be obtained according to the opening degree of the working condition adjusting valve of the engine 2, and therefore clean combustion is achieved. The particulate matter catcher 11 is positioned in front of an inlet of the low-pressure stage compressor, an inlet of the particulate matter catcher is connected with an outlet (or an inlet) of the high-pressure stage exhaust turbine through a pipeline, and an outlet of the particulate matter catcher is connected with the EGR valve, so that particulate matters in the exhaust gas can be purified, and the particulate matters can be prevented from influencing the operation of the compressor.
The check valve 6 is arranged on an inlet pipeline of the low-pressure stage compressor and is positioned at the upstream of an outlet of the medium-pressure EGR pipeline 12, so that air flow is ensured to flow to the compressor, and medium-pressure waste gas is prevented from flowing to the atmosphere through an air inlet pipeline. The EGR valve 10 is an electrically controlled valve, and the opening degree of the EGR valve can be adjusted by the ECU through detecting the operation condition of the engine 2 to obtain different EGR rates.
The utility model discloses middling pressure waste gas low pressure side induction system based on two-stage turbo charger, more specifically say so, a draw forth partly middling pressure waste gas in the pipeline from high-pressure level exhaust gas turbine export (or low-pressure level exhaust gas turbine import), through particulate matter trap 11, behind EGR valve 10 and EGR cooler 7, flow in low-pressure level compressor import (this department's pressure is the low pressure on the engine intake pipe way) pipeline, mix the back with fresh air together get into engine 2 after two-stage compressor pressure boost cooling, easily arrange and realize great EGR rate and the middling pressure waste gas low pressure side induction system of very fast transient response speed easily.
The working principle and the working process of the medium-pressure EGR system are as follows:
when the engine 2 needs EGR, the EGR valve 10 is opened, and due to the existence of pressure difference, exhaust gas flows into the medium-pressure EGR pipeline 12 from the outlet pipeline of the high-pressure stage exhaust turbine, is purified and cooled by the particulate matter catcher 11, the EGR valve 10 and the EGR cooler 7, enters the inlet pipeline of the low-pressure stage compressor, is mixed with fresh air, is pressurized and cooled by the two-stage compressor, and then enters the engine 2, so that the medium-pressure EGR is introduced into the low-pressure side of the air inlet pipeline. The ECU adjusts the opening degree of the EGR valve 10 by detecting the operation condition of the engine 2, and controls the flow rate of the exhaust gas entering the engine 2 in real time, so that different EGR rates are obtained, a larger EGR rate can be achieved even under a large load, and the requirements of high-load and low-load EGR are met. Since no exhaust gas is introduced from the exhaust gas aftertreatment, there is no difficulty in the layout of the entire vehicle. The utility model discloses in, because waste gas will pass through high-low pressure two-stage compressor, so particulate matter content can not be too high in the waste gas, otherwise damage the compressor easily, so set up particulate matter trap 11 in this middling pressure EGR system loop, particulate matter in the effectual filtration waste gas has both guaranteed the reliable operation of compressor, has reduced the pollution of waste gas to engine 2 and EGR system pipeline again.
Although the present invention has been described with reference to the accompanying drawings, the present invention is not limited to the above specific functions and operations, and the above specific embodiments are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention, which is within the protection scope of the present invention.
Claims (4)
1. The utility model provides a middling pressure waste gas low pressure side induction system based on two-stage turbo charger, includes engine (2), high-pressure stage turbo charger (4) and low-pressure stage turbo charger (5), engine (2) are connected with inlet manifold (1) and exhaust manifold (13), high-pressure stage turbo charger (4) are including coaxial pivoted high-pressure stage exhaust gas turbine and high-pressure stage compressor, low-pressure stage turbo charger (5) are including coaxial pivoted low-pressure stage exhaust gas turbine and low-pressure stage compressor, inlet manifold (1) is connected with the air inlet pipeline, exhaust manifold (13) are connected with the exhaust pipe, its characterized in that, check valve (6), low-pressure stage compressor, high-pressure stage compressor and intake intercooler (3) set gradually along the direction of admitting air on the air inlet pipeline, set gradually high-pressure stage exhaust gas turbine on the exhaust pipe along the direction, A low pressure stage exhaust turbine, an aftertreatment (9) and a backpressure valve (8);
an intermediate-pressure EGR pipeline (12) is connected between the outlet of the high-pressure stage exhaust gas turbine and the inlet of the low-pressure stage compressor, an EGR cooler (7), an EGR valve (10) and a particulate matter trap (11) are arranged on the intermediate-pressure EGR pipeline (12), and the EGR valve (10) is arranged between the EGR cooler (7) and the particulate matter trap (11); the outlet of the EGR cooler (7) is connected with the inlet pipeline of the low-pressure compressor, and the inlet of the EGR cooler is connected with the EGR valve (10); the inlet of the particulate matter catcher (11) is connected with the outlet pipeline of the high-pressure-stage exhaust turbine, and the outlet of the particulate matter catcher is connected with the EGR valve (10).
2. The two-stage turbocharger based medium pressure exhaust gas low pressure side induction system according to claim 1, wherein the inlet end of the medium pressure EGR line (12) is in communication with the high pressure stage exhaust gas turbine outlet or the low pressure stage exhaust gas turbine inlet line, and the outlet end is in communication with the low pressure stage compressor inlet line.
3. The two-stage turbocharger based medium pressure exhaust gas low pressure side induction system according to claim 1, characterized in that the EGR valve (10) is an electrically controlled valve, the opening of which is adjusted by the ECU by detecting the operating condition of the engine to obtain different EGR rates.
4. The two-stage turbocharger-based medium-pressure exhaust gas low-pressure side introduction system according to claim 1, characterized in that medium-pressure exhaust gas is led out from an outlet of the high-pressure stage exhaust gas turbine or an inlet pipeline of the low-pressure stage exhaust gas turbine, flows into an inlet pipeline of the low-pressure stage compressor after passing through the particulate matter trap (11), the EGR valve (10) and the EGR cooler (7), is mixed with fresh air and enters the engine (2) after being supercharged and cooled by the two-stage compressor.
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| CN201920628624.6U CN210343536U (en) | 2019-05-05 | 2019-05-05 | Medium-pressure exhaust gas low-pressure side introducing system based on two-stage turbocharger |
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| CN201920628624.6U CN210343536U (en) | 2019-05-05 | 2019-05-05 | Medium-pressure exhaust gas low-pressure side introducing system based on two-stage turbocharger |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110118141A (en) * | 2019-05-05 | 2019-08-13 | 天津大学 | A kind of middle pressure exhaust gas low-pressure side introducing system based on two-stage turbocharger |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110118141A (en) * | 2019-05-05 | 2019-08-13 | 天津大学 | A kind of middle pressure exhaust gas low-pressure side introducing system based on two-stage turbocharger |
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