CN219139222U

CN219139222U - EGR system and methanol engine

Info

Publication number: CN219139222U
Application number: CN202320297293.9U
Authority: CN
Inventors: 孙长春; 尚卫; 姜岩; 金海林
Original assignee: Zhejiang Geely Holding Group Co Ltd; Zhejiang Geely Remote New Energy Commercial Vehicle Group Co Ltd
Current assignee: Tianjin Alcohol Hydrogen Research And Development Co ltd; Zhejiang Geely Holding Group Co Ltd; Zhejiang Geely Remote New Energy Commercial Vehicle Group Co Ltd
Priority date: 2023-02-20
Filing date: 2023-02-20
Publication date: 2023-06-06
Anticipated expiration: 2033-02-20

Abstract

The utility model discloses an EGR system and a methanol engine, wherein the EGR system comprises an engine, a cooler, a water-vapor separation device, a water storage device, an EGR valve and an ECU (electronic control unit); one end of the cooler is communicated with an exhaust pipe of the engine, and the other end of the cooler is communicated with an exhaust gas inlet of the water-vapor separation device; one end of the EGR valve is communicated with an exhaust gas outlet of the water-vapor separation device, and the other end of the EGR valve is communicated with an air inlet pipe of the engine; the water storage device is connected between a water outlet of the water-steam separation device and an exhaust pipe of the engine; and the EGR valve is connected with the ECU electronic control module. The technical scheme of the utility model can solve the problem of condensate water treatment generated in the EGR system under the conditions of starting the heat engine and the like when the water temperature of the engine is low.

Description

EGR system and methanol engine

Technical Field

The utility model relates to the technical field of engines, in particular to an EGR system and a methanol engine.

Background

With the upgrading of emission regulations, the emission requirements for exhaust gases such as nitrogen oxides, hydrocarbons and carbon monoxide are also increasing. Since the exhaust gas contains a large amount of carbon dioxide, which cannot be combusted but absorbs heat, the combustion temperature in the cylinder is lowered, thereby reducing the amount of nitrogen oxides generated, and Exhaust Gas Recirculation (EGR) is a main method of purifying nitrogen oxides in the exhaust gas.

An important challenge of EGR systems is the problem of condensed water. Condensed water is generally formed in the engine warm-up or the like, and when the EGR valve is closed, exhaust gas is blocked in front of the EGR valve, and when the temperature of the EGR coolant is lower than the dew point of water while flowing through the EGR cooler, condensed water is formed in the EGR cooler. The condensed water has certain corrosiveness and can be corroded into the air inlet pipe through the EGR valve for a long time, so that the EGR valve is blocked or damaged on one hand, and on the other hand, the condensed water has corrosiveness to the air inlet pipe gasket and the cylinder body of the engine, and the engine tissue is extremely easy to damage, so that the service life of the engine is endangered.

Disclosure of Invention

The utility model mainly aims to provide an EGR system, which aims to solve the problem of condensate water treatment generated in the EGR system under the conditions of starting a heat engine and the like when the temperature of water of an engine is low.

To achieve the above object, the present utility model provides an EGR system comprising:

the system comprises an engine, a cooler, a water-vapor separation device, a water storage device, an EGR valve and an ECU electronic control module;

one end of the cooler is communicated with an exhaust pipe of the engine, and the other end of the cooler is communicated with an exhaust gas inlet of the water-vapor separation device;

one end of the EGR valve is communicated with an exhaust gas outlet of the water-vapor separation device, and the other end of the EGR valve is communicated with an air inlet pipe of the engine;

the water storage device is connected between a water outlet of the water-steam separation device and an exhaust pipe of the engine; and

and the EGR valve is connected with the ECU electronic control module.

Optionally, the water-vapor separation device comprises a shell and a separation baffle, a separation cavity is arranged in the shell, the waste gas inlet and the waste gas outlet are arranged on two opposite sides of the shell and are communicated with the separation cavity, and the separation baffle is arranged in the separation cavity.

Optionally, the separation baffle is provided with a plurality of, and each separation baffle is arranged at intervals along the length extension direction of the separation cavity, and is arranged in a staggered manner along the width extension direction of the separation cavity.

Optionally, the exhaust gas inlet and the exhaust gas outlet are arranged in a staggered manner along the width extension direction of the separation cavity, and the exhaust gas inlet is located below the exhaust gas outlet and is arranged opposite to the separation baffle.

Optionally, a filter screen structure is arranged on the separation baffle, and the filter screen structure is arranged in the middle of the separation baffle;

and/or the shell is convexly provided with a liquid collecting part, the liquid collecting part is communicated with the water storage device, a liquid collecting cavity is arranged in the liquid collecting part and is communicated with the separation cavity through the water outlet, and the liquid collecting cavity is positioned below the separation cavity.

Optionally, the water storage device comprises a water storage tank, and a first electromagnetic valve and a second electromagnetic valve which are connected with a water inlet and a water outlet of the water storage tank, wherein the first electromagnetic valve is communicated with a water outlet of the water-vapor separation device, and the second electromagnetic valve is communicated with an exhaust pipe of the engine;

the first electromagnetic valve and the second electromagnetic valve are connected with the ECU electronic control module.

Optionally, a liquid level sensor is arranged in the water storage tank, and the liquid level sensor is connected with the ECU electronic control module.

Optionally, a water temperature sensor is arranged on the engine, and the water temperature sensor is connected with the ECU electronic control module.

Optionally, an air filter is arranged at an air inlet of an air inlet pipe of the engine;

and/or an exhaust port of an exhaust pipe of the engine is connected with a catalyst.

The utility model also proposes a methanol engine comprising an EGR system as described above.

According to the technical scheme, the water-vapor separation device is arranged to separate water from vapor of the exhaust gas which participates in recirculation, so that moisture in the exhaust gas formed under the cooling effect after the engine is combusted is effectively filtered, the possibility that condensed water enters the air inlet pipe through the EGR valve is reduced, and the service life of an EGR system is effectively prolonged.

The condensed water is collected by the water storage device, so that on one hand, the moisture content of waste gas entering the air inlet pipe is effectively reduced, the condition that the engine is unstable due to fire caused by the fact that the condensed water enters the engine cylinder through the air inlet pipe is effectively avoided, and the service life of the engine is further prolonged; on the other hand, the problem that condensed water is frozen and blocked in the pipe under the condition of low air temperature is avoided; in addition, the water stored in the water storage device is discharged to the exhaust pipe, and the heat on the exhaust pipe is utilized to enable the water to be vaporized and spread to the catalyst for catalytic reaction, so that the possibility of environmental pollution is effectively reduced.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an embodiment of an EGR system of the present utility model;

fig. 2 is a schematic structural view of the water vapor separation device in fig. 1.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				10	Engine with a motor	24	Shell body
11	Air inlet pipe	24a	Separation chamber
				12	Exhaust pipe	25	Separating baffle
13	Water temperature sensor	26	Liquid collecting part
				14	Cooling device	30	Water storage device
15	EGR valve	31	Water storage tank
				16	Air filter	32	First electromagnetic valve
20	Water-steam separator	33	Second electromagnetic valve
				21	Exhaust gas inlet	34	Liquid level sensor
22	Exhaust gas outlet	40	ECU electric control module
				23	Water outlet

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout is meant to include three side-by-side schemes, for example, "a and/or B", including a scheme, or B scheme, or a scheme that is satisfied by both a and B. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The utility model provides an EGR system.

Referring to fig. 1 to 2, in an embodiment of the present utility model, the EGR system includes an engine 10, a cooler 14, a water vapor separation device 20, a water storage device 30, an EGR valve 15, and an ECU electronic control module 40; one end of the cooler 14 is communicated with the exhaust pipe 12 of the engine 10, and the other end is communicated with the exhaust gas inlet 21 of the water-vapor separation device 20; one end of the EGR valve 15 communicates with the exhaust gas outlet 22 of the water vapor separation device 20, and the other end communicates with the intake pipe 11 of the engine 10; the water storage device 30 is connected between the water outlet 23 of the water-vapor separation device 20 and the exhaust pipe 12 of the engine 10; the EGR valve 15 is connected with the ECU electronic control module 40, through setting up water vapor separation device 20, effectively separates the condensate water that waste gas produced under the cooling effect of cooler 14 to concentrate the collection through water storage device 30, and discharge to blast pipe 12 and evaporate, effectively reduce the condensate water and get into the possibility in the engine 10 through intake pipe 11, and then the life of extension engine 10.

The EGR system can be applied to the methanol engine 10, wherein condensed water is very easy to be generated when the water temperature of the engine 10 is lower than 65 ℃ or the engine 10 is in a low-temperature environment, so that the water vapor separating device 20 and the water storage device 30 are arranged in the EGR system, water vapor in EGR waste gas can be effectively separated and discharged out of the EGR system, and further the corrosion risk of structures such as an EGR valve 15, an engine air pipe and a gasket is reduced, so that the high-efficiency and high-reliability operation capability of the engine 10 can be obviously promoted.

The EGR valve 15 is connected with the ECU electronic control module 40 to control the opening and closing of the EGR valve 15, that is, when the engine 10 is in a low temperature environment or the water temperature is low, the engine 10 is in a heat engine, suddenly stops, or the like, by controlling the closing of the EGR valve 15, and performing gas-liquid separation by using a gas-liquid separation device between the cooler 14 and the EGR valve 15, at this time, the gas separated by the gas-liquid separation is blocked by the EGR valve 15, and moisture can be concentrated in the water storage device 30; after the heat engine of the engine 10 is heated, after the water temperature reaches the set temperature, the EGR valve 15 is controlled to be opened, at this time, gas separated from gas and liquid can enter the engine 10 through the EGR valve 15 and enter the air inlet pipe 11 to realize the recirculation of exhaust gas, and the exhaust gas continuously generated by the engine 10 can be continuously separated from gas and moisture under the action of the cooler 14 and the gas-liquid separation device, the gas enters the engine 10 to realize the recirculation of the exhaust gas, and the moisture enters the water storage device 30 to be collected in a concentrated manner, so that the condensed water generated after the exhaust gas is cooled can be effectively filtered, in other words, when the water temperature is lower and the EGR valve 15 is not opened, or when the water temperature is high, the gas-liquid separation device can better filter the moisture in the exhaust gas formed after the engine 10 is combusted under the cooling action, thereby reducing the possibility that the condensed water enters the air inlet pipe 11 connected with the engine 10 through the EGR valve 15 and effectively prolonging the service life of the EGR system.

In addition, the setting of water vapor separation device 20 and water storage device 30, when carrying out separation and collection with the steam in the waste gas, effectively avoid the blast pipe 12, between cooler 14 and the water vapor separation device 20, connecting pipe such as between water vapor separation device 20 and the EGR valve 15 remain with moisture, and then effectively solve engine 10 and idle for a long time under low temperature environment, with engine 10 do not regular work operation, after shut down, and when the EGR valve 15 is in unopened state, because of being in the intraductal comdenstion water icing problem that causes of low temperature environment.

Because the water storage device 30 is connected between the water outlet 23 of the water-vapor separation device 20 and the exhaust pipe 12 of the engine 10, on one hand, the problem that the generated condensed water is accumulated and cannot be discharged or stored can be prevented, the moisture content of the exhaust gas entering the air inlet pipe 11 is effectively reduced, and further, the conditions that the engine 10 is unstable in work and the like caused by fire of the engine 10 due to the fact that the condensed water enters the cylinder of the engine 10 through the air inlet pipe 11 are effectively avoided, and the service life of the engine 10 is prolonged; on the other hand, when the water storage device 30 reaches a certain water storage amount and the exhaust pipe 12 reaches a certain temperature, the water stored in the water storage device 30 is discharged to the exhaust pipe 12, and at this time, the heat on the exhaust pipe 12 can enable the water to evaporate and diffuse to the catalyst for catalytic reaction, so that the possibility of environmental pollution can be effectively reduced.

The water-vapor separation device 20 and the water storage device 30 are arranged at the lowest part of the EGR system, so that condensed water can conveniently flow to the water-vapor separation device 20 and the water storage device 30 due to gravity, and the efficiency of separating and discharging water vapor in the EGR waste gas out of the EGR system is improved.

According to the technical scheme, the water-vapor separation device 20 is arranged to separate water from vapor of the exhaust gas which participates in recirculation, so that moisture in the exhaust gas formed under the cooling effect after the engine 10 is combusted is effectively filtered, the possibility that condensed water enters the air inlet pipe 11 through the EGR valve 15 is reduced, and the service life of an EGR system is effectively prolonged.

By arranging the water storage device 30 to collect condensed water, on one hand, the moisture content of waste gas entering the air inlet pipe 11 is effectively reduced, so that the condition that the engine 10 is unstable due to fire caused by the fact that the condensed water enters the cylinder of the engine 10 through the air inlet pipe 11 is effectively avoided, and the service life of the engine 10 is further prolonged; on the other hand, the problem that condensed water is frozen and blocked in the pipe under the condition of low air temperature is avoided; in addition, the water stored in the water storage device 30 is discharged to the exhaust pipe 12, and the heat on the exhaust pipe 12 is utilized to vaporize and diffuse the water to the catalyst for catalytic reaction, so that the possibility of environmental pollution is effectively reduced.

Optionally, in an embodiment, the water-vapor separation device 20 includes a housing 24 and a separation baffle 25, the housing 24 is provided with a separation chamber 24a, the exhaust gas inlet 21 and the exhaust gas outlet 22 are disposed on opposite sides of the housing 24 and are communicated with the separation chamber 24a, the separation baffle 25 is disposed in the separation chamber 24a, when the exhaust gas with water vapor enters the separation chamber 24a of the housing 24 through the exhaust gas inlet 21, the exhaust gas collides with the separation baffle 25, so that moisture in the exhaust gas is separated from the gas, wherein the gas flows out from the exhaust gas outlet 22, and the moisture is discharged from the water outlet 23, thereby effectively reducing the possibility that condensed water enters the engine 10 through the air inlet pipe 11, further prolonging the service life of the engine 10, and simultaneously avoiding the problem that the condensed water in the air pipe and the housing 24 is frozen and blocked under the condition of low air temperature.

Referring to fig. 2, in an embodiment, a plurality of separation baffles 25 are disposed, each separation baffle 25 is arranged at intervals along the length extending direction of the separation chamber 24a, and is arranged in a staggered manner along the width extending direction of the separation chamber 24a, so that a serpentine exhaust gas channel can be formed in the separation chamber 24a, so that the exhaust gas continuously collides with each separation baffle 25 in the diffusion process, and moisture and gas in the exhaust gas are separated from each other, thereby effectively improving the water-vapor separation effect of the water-vapor separation device 20. Furthermore, the provision of the separation baffle 25 can effectively reduce the flow resistance of the gas.

Further, in an embodiment, the exhaust gas inlet 21 and the exhaust gas outlet 22 are arranged in a staggered manner along the width extending direction of the separation chamber 24a, the exhaust gas inlet 21 is located below the exhaust gas outlet 22 and is disposed opposite to a separation baffle 25, that is, the separation baffle 25 is located right in front of the chamber wall provided with the exhaust gas outlet 22, and blocks the flow of the exhaust gas, so that when the exhaust gas enters the separation chamber 24a through the exhaust gas inlet 21, the exhaust gas collides with the separation baffle 25 first, thereby accelerating the separation efficiency. And the exhaust outlet 22 is located above the exhaust inlet 21, so that the diffusion of the separated gas is facilitated, and the speed of the gas flowing out of the housing 24 through the exhaust outlet 22 is increased. However, in other embodiments, the exhaust gas inlet 21 and the exhaust gas outlet 22 may be disposed at the same height.

Optionally, in an embodiment, the separation baffle 25 is provided with a filter structure, which is disposed in the middle of the separation baffle 25, so as to further improve the separation effect of the separation baffle 25, and after the exhaust gas hits the filter structure, the moisture flows along the separation baffle 25 to concentrate at the water outlet 23, and the gas can pass through the filter structure and diffuse toward the exhaust gas outlet 22.

Optionally, in an embodiment, the casing 24 is convexly provided with the liquid collecting portion 26, the liquid collecting portion 26 is communicated with the water storage device 30, a liquid collecting cavity is arranged in the liquid collecting portion 26 and is communicated with the separation cavity 24a through the water outlet 23, the liquid collecting cavity is located below the separation cavity 24a, separated water is conveniently and intensively discharged into the liquid collecting cavity due to gravity, and the liquid collecting portion 26 is communicated with the water storage device 30, so that connection with the water storage device 30 can be facilitated, the separated water can be further stored into the water storage device 30, and the problems that too much water is contained in waste gas discharged from the waste gas outlet 22 and icing phenomenon occurs in the separation cavity 24a under the low temperature condition can be effectively avoided.

Specifically, as shown in fig. 1, in one embodiment, the water storage device 30 includes a water storage tank 31, and a first solenoid valve 32 and a second solenoid valve 33 connected to a water inlet and a water outlet of the water storage tank 31, the first solenoid valve 32 being in communication with the water outlet 23 of the water vapor separation device 20, the second solenoid valve 33 being in communication with the exhaust pipe 12 of the engine 10; the first electromagnetic valve 32 and the second electromagnetic valve 33 are connected with the ECU electric control module 40, and then after a certain amount of water is stored in the water storage tank 31, the first electromagnetic valve 32 is controlled to be closed through the ECU electric control module 40, a channel between the water outlet 23 of the water-vapor separation device 20 and the water inlet of the water storage tank 31 is blocked, and the second electromagnetic valve 33 is controlled to be opened through the ECU electric control module 40, so that water in the water storage tank 31 is discharged into the exhaust pipe 12, evaporation and vaporization are carried out by utilizing heat on the exhaust pipe 12, and then gas generated after vaporization is diffused into the catalyst for catalytic reaction, so that pollution to the external environment can be greatly reduced.

Specifically, in an embodiment, the water storage tank 31 is provided with a liquid level sensor 34, the liquid level sensor 34 is connected with the ECU electronic control module 40, so as to monitor the water storage amount in the water storage tank 31 in real time, when the liquid level sensor 34 detects that the water level in the water storage tank 31 reaches the set position, the ECU electronic control module 40 can send a corresponding signal instruction to the ECU electronic control module 40 through the liquid level sensor 34, so that the ECU electronic control module 40 can quickly close the first electromagnetic valve 32 and open the second electromagnetic valve 33, water in the water storage tank 31 is effectively prevented from overflowing to the water-vapor separation device 20, the possibility of icing phenomena in the water-vapor separation device 20 and the water storage tank 31 is reduced, and the moisture content of the exhaust gas diffused to the EGR valve 15 is ensured to be as low as possible.

Referring to fig. 1, in an embodiment, a water temperature sensor 13 is disposed on an engine 10, the water temperature sensor 13 is connected with an ECU electronic control module 40, so as to monitor the temperature of cooling water in the engine 10 in real time, so that when the water temperature reaches a set temperature value, for example, higher than 65 ℃, the water temperature sensor 13 can send a corresponding signal instruction to the ECU electronic control module 40, and the ECU electronic control module 40 is prompted to open an EGR valve 15, so that exhaust gas separated by the water-vapor separation device 20 flows into an intake pipe 11 through the EGR valve 15, and flows into the engine 10 to participate in combustion, thereby realizing recirculation of the exhaust gas.

Referring to fig. 1, in one embodiment, an air filter 16 is provided at an air inlet of an air inlet pipe 11 of the engine 10 to filter out dust and sand in air, so as to ensure that sufficient and clean air is introduced into a cylinder; while greatly reducing the wear of the piston groups and cylinders within engine 10.

Optionally, in an embodiment, the exhaust port of the exhaust pipe 12 of the engine 10 is connected to a catalyst, and the exhaust gas is further purified by the catalyst, so that the emission of harmful gas is reduced, and the pollution to the external environment is reduced.

The utility model also provides a methanol engine, which comprises an EGR system, and the specific structure of the EGR system refers to the embodiment, and because the methanol engine adopts all the technical schemes of all the embodiments, the methanol engine has at least all the beneficial effects brought by the technical schemes of the embodiments, and the detailed description is omitted.

The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all the equivalent structural changes made by the description of the present utility model and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims

1. An EGR system, characterized by comprising:

and the EGR valve is connected with the ECU electronic control module.

2. The EGR system of claim 1 wherein the water vapor separator includes a housing having a separation chamber therein, and a separator baffle disposed in the separation chamber, the exhaust gas inlet and the exhaust gas outlet being disposed on opposite sides of the housing and in communication with the separation chamber.

3. The EGR system of claim 2, wherein the separation baffle is provided in plurality, each of the separation baffles being arranged at intervals along a length extending direction of the separation chamber and being offset along a width extending direction of the separation chamber.

4. The EGR system of claim 3 wherein said exhaust gas inlet and said exhaust gas outlet are offset along a width extension of said separation chamber, said exhaust gas inlet being positioned below said exhaust gas outlet and opposite to one of said separation baffles.

5. The EGR system of claim 2 wherein the separator plate has a filter screen structure thereon, the filter screen structure being disposed in a middle portion of the separator plate;

6. The EGR system of claim 1, wherein the water storage means comprises a water storage tank, and first and second solenoid valves connected to a water inlet and a water outlet of the water storage tank, the first solenoid valve being in communication with a water outlet of the water-vapor separation device, the second solenoid valve being in communication with an exhaust pipe of the engine;

7. The EGR system of claim 6 wherein a liquid level sensor is disposed within the water storage tank, the liquid level sensor being coupled to the ECU electronic control module.

8. The EGR system of claim 1 wherein a water temperature sensor is provided on the engine, the water temperature sensor being connected to the ECU electronic control module.

9. The EGR system of claim 1 wherein an air inlet of an intake pipe of the engine is provided with an air filter;

10. A methanol engine comprising an EGR system as claimed in any one of claims 1 to 9.