CN211924292U - Diesel engine exhaust aftertreatment system - Google Patents
Diesel engine exhaust aftertreatment system Download PDFInfo
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- CN211924292U CN211924292U CN202020514579.4U CN202020514579U CN211924292U CN 211924292 U CN211924292 U CN 211924292U CN 202020514579 U CN202020514579 U CN 202020514579U CN 211924292 U CN211924292 U CN 211924292U
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- heating device
- control unit
- metal plate
- exhaust aftertreatment
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Abstract
A diesel engine exhaust aftertreatment system includes an exhaust aftertreatment package, a power supply, a control unit, and a coil heating device. The exhaust aftertreatment package includes an exhaust inlet, an exhaust outlet, and a metal plate to be heated between the exhaust inlet and the exhaust outlet, wherein: the power supply is connected with the control unit and supplies power required by the work of the control unit; the control unit is connected with the coil heating device, and the coil heating device is arranged on the metal plate to be heated; when the metal plate to be heated needs to be heated, the control unit transmits an alternating voltage signal to the coil heating device, so that the coil heating device generates an eddy current effect on the metal plate to be heated, and the temperature of the metal plate to be heated is increased.
Description
Technical Field
The utility model relates to a diesel engine exhaust aftertreatment system belongs to diesel engine tail gas aftertreatment technical field.
Background
The diesel engine exhaust aftertreatment system is used for treating tail gas discharged by the diesel engine. With the continuous upgrade of national emission regulations, the treatment requirements on harmful substances in tail gas are higher and higher. As a typical technical route, in order to reduce the concentration of harmful substances, it is necessary to increase the amount of urea solution injected into the exhaust gas. The challenge with this route is that urea crystallization is likely to occur when the urea injection amount is increased. The person skilled in the art knows that the temperature is of crucial importance for the influence of urea crystallization, the lower the temperature the greater the risk of urea crystallization. Therefore, in order to reduce urea crystallization, the temperature needs to be increased.
At present, two technologies of heating by an electric heating wire and heating by a fuel combustion furnace exist, wherein the electric heating wire has slow heating response, inflexible laying, large occupied area and large energy consumption; fuel-fired furnace heating techniques require additional fuel consumption (e.g., diesel, etc.), additional exhaust pollutants, and are inflexible and costly to install.
Therefore, there is a need for a new type of diesel engine exhaust aftertreatment system.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a diesel engine exhaust aftertreatment system convenient to installation and cost are lower.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a diesel engine exhaust aftertreatment system comprising an exhaust aftertreatment package, a power supply, a control unit and a coil heating device, the exhaust aftertreatment package comprising an exhaust gas inlet, an exhaust gas outlet and a metal plate to be heated located between the exhaust gas inlet and the exhaust gas outlet, wherein: the power supply is connected with the control unit and supplies power required by the work of the control unit; the control unit is connected with the coil heating device, and the coil heating device is arranged on the metal plate to be heated; when the metal plate to be heated needs to be heated, the control unit transmits an alternating voltage signal to the coil heating device, so that the coil heating device generates an eddy current effect on the metal plate to be heated, and the temperature of the metal plate to be heated is increased.
As a further improved technical scheme of the utility model, the coil heating device with treat that heating metal sheet contacts.
As a further improved technical scheme of the utility model, the coil heating device with treat that the heating metal sheet contactless.
As a further improved technical scheme of the utility model, diesel engine exhaust aftertreatment system is still including connecting coil heating device with the control unit's sensor signal line, with will wait to heat the temperature feedback of metal sheet and give control unit.
As a further improved technical solution of the present invention, the exhaust aftertreatment package includes a diesel catalytic oxidizer (DOC), is located the Diesel Particulate Filter (DPF) in the lower reaches of the diesel catalytic oxidizer (DOC), is located the Selective Catalytic Reducer (SCR) in the lower reaches of the Diesel Particulate Filter (DPF) and is located the Diesel Particulate Filter (DPF) and the mixer between the Selective Catalytic Reducer (SCR).
As a further improved technical scheme of the utility model, the power is a battery or a generator.
As a further improved technical scheme of the utility model, the control unit is automobile Electronic Control Unit (ECU).
As a further improved technical solution of the present invention, the coil heating device includes a dc coil for receiving an alternating voltage signal.
Compared with the prior art, the utility model discloses a set up coil heating device and utilize the electromagnetic eddy current heating technique to realize the heating, be convenient for installation and cost are lower.
Drawings
FIG. 1 is a schematic diagram of a diesel engine exhaust aftertreatment system of the present invention.
Fig. 2 is a schematic diagram of eddy current heating.
Detailed Description
Referring to fig. 1 and 2, the present invention discloses an exhaust aftertreatment system of a diesel engine, which includes an exhaust aftertreatment package 1, a power supply 2, a control unit 3, and a coil heating device 4. The exhaust gas aftertreatment package 1 includes an exhaust gas inlet 11, an exhaust gas outlet 12, and a metal plate to be heated 13 located between the exhaust gas inlet 11 and the exhaust gas outlet 12. The metal plate 13 to be heated may be a casing of the exhaust gas aftertreatment package 1, or may be any casing that needs to be heated. The power supply 2 is connected with the control unit 3 and supplies power required by the work of the control unit 3. The control unit 3 is connected with the coil heating device 4, and the coil heating device 4 is installed on the metal plate 13 to be heated. When the metal plate 13 to be heated needs to be heated, the control unit 3 transmits an alternating voltage signal to the coil heating device 4, so that the coil heating device 4 generates an eddy current effect on the metal plate 13 to be heated, thereby increasing the temperature of the metal plate 13 to be heated. The coil heating device 4 may be in contact with the metal plate 13 to be heated, or the coil heating device 4 may be spaced apart from the metal plate 13 to be heated by a distance such that they are not in contact. By the arrangement, the installation flexibility of the coil heating device 4 is improved, and the efficiency is improved.
Specifically, in an embodiment of the present invention, the exhaust gas aftertreatment package 1 includes a diesel catalytic oxidizer (DOC), a Diesel Particulate Filter (DPF) located at a downstream of the diesel catalytic oxidizer (DOC), a selective catalytic reduction agent (SCR) located at a downstream of the Diesel Particulate Filter (DPF), and a mixer located between the Diesel Particulate Filter (DPF) and the selective catalytic reduction agent (SCR). The metal plate to be heated 13 corresponds to the mixer. Of course, in other embodiments, the metal plate 13 to be heated may be any surface of the exhaust gas aftertreatment package 1 that needs to be heated, and is not limited to a mixer portion.
In one embodiment of the present invention, the power source 2 is a vehicle-mounted power source, such as a battery or a generator. The control unit 3 is an automotive Electronic Control Unit (ECU). The power source 2 and the control unit 3 are connected by a first connection harness 51, and the control unit 3 and the coil heating device 4 are connected by a second connection harness 52. In addition, the diesel engine exhaust gas aftertreatment system further includes a sensor signal line 53 connecting the coil heating device 4 and the control unit 3 to feed back the temperature of the metal plate to be heated 13 to the control unit 3.
In one embodiment of the present invention, the coil heating device 4 includes a dc coil, such as an iron core coil, for receiving an alternating voltage signal.
When the exhaust gas after-treatment system of the diesel engine is used for purifying the exhaust gas, the local part (corresponding to the metal plate 13 to be heated) of the exhaust gas after-treatment package 1 is heated in an auxiliary manner according to the requirement, so that the exhaust gas after-treatment system of the diesel engine can purify the exhaust gas. Specifically, the coil heating device 4 is attached to the metal plate to be heated 13 of the exhaust gas aftertreatment package 1. The shape of the coil heating device 4 is not limited, and the coil heating device can be flexibly designed according to actual needs. Then, a temperature sensor connected to the sensor signal line 53 is attached just below the dc coil to monitor the temperature of the metal plate 13 to be heated in real time, so that the temperature is controlled within a desired temperature range by the control unit 3.
The utility model discloses diesel engine exhaust aftertreatment system's heating method includes following step:
s1: judging whether the metal plate 13 to be heated needs to be heated;
s2: when it is determined that heating is needed, the control unit 3 transmits an alternating voltage signal to the coil heating device 4, the coil heating device 4 generates an alternating magnetic field in a direction perpendicular to the metal plate 13 to be heated, and the alternating magnetic field generates an eddy current effect on the metal plate 13 to be heated, so that the metal plate 13 to be heated generates an eddy current and releases joule heat to increase the temperature of the metal plate 13 to be heated.
Specifically, referring to fig. 2, the control unit 3 transmits a variable frequency alternating voltage UiFor the coil heating device 4, a current I is generated in the coil heating device 41Said lineThe coil heating device 4 generates an alternating magnetic field H in a direction perpendicular to the metal plate 13 to be heated along a direct current coil in the device1(e.g., a controlled alternating magnetic field). The controlled alternating magnetic field H1An eddy current effect is generated on the metal plate 13 to be heated to generate an alternating magnetic field H1Induced magnetic field H with opposite directions2And generating an alternating current I2(i.e., eddy current), a large amount of joule heat is released (formula Q ═ I)2 2R T, wherein Q represents Joule fever, I2Representing the aforementioned alternating current, R representing resistance, and T representing time), ultimately achieving heating. The coil heating device 4 and the metal plate 13 to be heated have a height X therebetween, which is adjustable.
The heating method further comprises the following steps:
s3: the temperature of the metal plate 13 to be heated is fed back to the control unit 3.
Compared with the prior art, the utility model discloses a set up coil heating device 4 and utilize the electromagnetic eddy current heating technique to realize the heating, be convenient for installation, the cost is lower, the heating response is fast and can not additionally produce waste gas pollutant because of heating itself.
The above embodiments are only used for illustrating the present invention and not for limiting the technical solutions described in the present invention, and the understanding of the present specification should be based on the technical personnel in the technical field, and although the present specification has described the present invention in detail with reference to the above embodiments, the skilled personnel in the art should understand that the technical personnel in the technical field can still modify or substitute the present invention, and all the technical solutions and modifications thereof that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.
Claims (8)
1. A diesel engine exhaust aftertreatment system characterized by: including exhaust aftertreatment encapsulation, power, the control unit and coil heating device, exhaust aftertreatment encapsulation includes exhaust inlet, exhaust outlet and is located exhaust inlet with the exhaust outlet between wait to heat the metal sheet, wherein: the power supply is connected with the control unit and supplies power required by the work of the control unit; the control unit is connected with the coil heating device, and the coil heating device is arranged on the metal plate to be heated; when the metal plate to be heated needs to be heated, the control unit transmits an alternating voltage signal to the coil heating device, so that the coil heating device generates an eddy current effect on the metal plate to be heated, and the temperature of the metal plate to be heated is increased.
2. The diesel engine exhaust aftertreatment system of claim 1, wherein: the coil heating device is in contact with the metal plate to be heated.
3. The diesel engine exhaust aftertreatment system of claim 1, wherein: the coil heating device is not in contact with the metal plate to be heated.
4. The diesel engine exhaust aftertreatment system of claim 1, wherein: the diesel engine exhaust aftertreatment system further comprises a sensor signal wire connected with the coil heating device and the control unit, so that the temperature of the metal plate to be heated is fed back to the control unit.
5. The diesel engine exhaust aftertreatment system of claim 1, wherein: the exhaust aftertreatment package includes a diesel catalytic oxidizer DOC, a diesel particulate trap DPF located downstream of the diesel catalytic oxidizer DOC, a selective catalytic reductant SCR located downstream of the diesel particulate trap DPF, and a mixer located between the diesel particulate trap DPF and the selective catalytic reductant SCR.
6. The diesel engine exhaust aftertreatment system of claim 1, wherein: the power supply is a battery or a generator.
7. The diesel engine exhaust aftertreatment system of claim 1, wherein: the control unit is an automobile electronic control unit ECU.
8. The diesel engine exhaust aftertreatment system of claim 1, wherein: the coil heating device comprises a direct current coil for receiving an alternating voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020514579.4U CN211924292U (en) | 2020-04-10 | 2020-04-10 | Diesel engine exhaust aftertreatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020514579.4U CN211924292U (en) | 2020-04-10 | 2020-04-10 | Diesel engine exhaust aftertreatment system |
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| Publication Number | Publication Date |
|---|---|
| CN211924292U true CN211924292U (en) | 2020-11-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020514579.4U Active CN211924292U (en) | 2020-04-10 | 2020-04-10 | Diesel engine exhaust aftertreatment system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211924292U (en) |
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2020
- 2020-04-10 CN CN202020514579.4U patent/CN211924292U/en active Active
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