CN218669510U - Selective catalytic reduction system and engine system - Google Patents

Selective catalytic reduction system and engine system Download PDF

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Publication number
CN218669510U
CN218669510U CN202223012200.8U CN202223012200U CN218669510U CN 218669510 U CN218669510 U CN 218669510U CN 202223012200 U CN202223012200 U CN 202223012200U CN 218669510 U CN218669510 U CN 218669510U
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outlet
selective catalytic
valve
exhaust
inlet
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CN202223012200.8U
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赵德礼
肖志刚
高建立
国丽
范宣宗
白玲
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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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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Abstract

The utility model relates to a field of engine discloses a selective catalytic reduction system and engine system, this selective catalytic reduction system, include: the heat exchanger is provided with an exhaust inlet, an exhaust outlet, a heat exchange medium inlet and a heat exchange medium outlet; the selective catalytic reducer is provided with an inlet and an outlet, and the inlet of the selective catalytic reducer is connected with the exhaust outlet pipeline; the heater is positioned between the inlet of the selective catalytic reducer and the pipeline of the exhaust outlet; the temperature sensor is arranged on one side of the inlet of the selective catalytic reduction device; the steering valve group is arranged at the outlet of the selective catalytic reducer, and when the steering valve group is in a first state, the outlet of the selective catalytic reducer is communicated with the external environment; when the steering valve group is in a second state, the outlet of the selective catalytic reducer is communicated with the heat exchange medium inlet of the heat exchanger through a medium pipeline; the outlet of the refrigerator can be selectively communicated with or disconnected from the medium pipeline.

Description

Selective catalytic reduction system and engine system
Technical Field
The utility model relates to a technical field of engine, in particular to selective catalytic reduction system and engine system.
Background
Most engines at present use a Selective Catalytic Reduction (SCR) to reduce Nitrogen Oxides (NO) in exhaust emissions X ) Pollutants, when the exhaust temperature of the engine is too low, SCR can not work normally, urea crystals and NO can be generated X The emission exceeds the standard and the like; when the exhaust temperature of the engine is too high, irreversible aging can be generated on the SCR catalyst, and the service life of the SCR is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a selective catalytic reduction system and engine system for improve SCR to engine exhaust catalytic reduction efficiency.
In order to achieve the above purpose, the utility model provides the following technical scheme:
in a first aspect, an embodiment of the present invention provides a selective catalytic reduction system for treating engine exhaust, including:
the heat exchanger is provided with an exhaust inlet, an exhaust outlet, a heat exchange medium inlet and a heat exchange medium outlet;
a selective catalytic reducer having an inlet and an outlet, the inlet of the selective catalytic reducer being connected to the exhaust outlet conduit;
a heater located between the inlet of the selective catalytic reducer and the duct of the exhaust outlet;
the temperature sensor is arranged on one side of the inlet of the selective catalytic reducer and used for acquiring the temperature of the engine exhaust;
the steering valve group is arranged at an outlet of the selective catalytic reducer and is used for controlling the outlet of the selective catalytic reducer to be selectively communicated with a heat exchange medium inlet of the heat exchanger or an external environment; when the diverter valve block is in a first state, the outlet of the selective catalytic reducer is communicated with the external environment; when the steering valve group is in a second state, the outlet of the selective catalytic reducer is communicated with the heat exchange medium inlet of the heat exchanger through a medium pipeline;
the refrigerator is used for conveying cold medium in the medium pipeline, and an outlet of the refrigerator is selectively communicated with or disconnected from the medium pipeline.
The nitrogen oxide that produces when the engine exhausts needs to be reduced through selective catalytic reduction ware to generate nitrogen gas and water, and the engine exhaust gets into the heat exchanger through the exhaust gas pipeline, and the engine exhaust flows through heater and temperature sensor, then gets into selective catalytic reduction ware, and the turn valve group sets up the exit at selective catalytic reduction ware, and when the turn valve group was in first state, the exit and the external environment intercommunication of selective catalytic reduction ware, through the turn valve group discharge to the external environment in the reduction, also be exactly discharge to the atmosphere. When the steering valve group is in the second state, the outlet of the selective catalytic reduction device is communicated with the heat exchange medium inlet of the heat exchanger through a medium pipeline, nitrogen generated after reduction of the selective catalytic reduction device enters the heat exchanger through the medium pipeline for reutilization, and engine exhaust entering the heat exchanger is subjected to heat exchange by utilizing the nitrogen, so that the heat utilization rate is improved, and more energy is saved. For example, when the engine exhaust temperature is low-temperature exhaust, the heat of nitrogen is used for heating the engine exhaust, so that the heat utilization rate is improved, and more energy is saved; when the exhaust temperature of the engine is high-temperature gas, the nitrogen is refrigerated by the refrigerator, so that the nitrogen entering the heat exchanger is used as a cold medium to refrigerate the exhaust of the engine, the heat utilization rate is improved, more energy is saved, and the bidirectional heat management of the engine is realized.
Optionally, the method further comprises: the first valve is arranged at an outlet of the refrigerator and used for controlling the connection and disconnection between the refrigerator and the medium pipeline.
Optionally, the outlet of the heat exchange medium of the heat exchanger is connected with the outlet of the selective catalytic reduction unit through an exhaust pipeline, and a second valve for controlling the on-off of the pipeline is arranged on the exhaust pipeline.
Optionally, the set of diverter valves comprises a third valve and a fourth valve;
the third valve is arranged at the outlet of the selective catalytic reducer and used for controlling the connection and disconnection between the outlet of the selective catalytic reducer and the external environment;
the fourth valve is disposed between an outlet of the selective catalytic reducer and the first valve.
Optionally, the temperature sensor is disposed between the heater and an inlet of the selective catalytic reducer.
Optionally, the temperature sensor is disposed between an exhaust outlet of the heat exchanger and the heater.
Optionally, the temperature sensor is disposed at an inlet of the selective catalytic reducer.
Optionally, the refrigerator comprises an air cooler.
Optionally, an air outlet pipe communicated with the external environment is arranged in an air outlet pipe between the heat exchange medium outlet of the heat exchanger and the outlet of the selective catalytic reducer, and a fifth valve for controlling the on-off of the pipe is arranged on the air outlet pipe.
In a second aspect, the present disclosure provides an engine system comprising the selective catalytic reduction system of the first aspect.
Drawings
Fig. 1 is a schematic structural diagram of a selective catalytic reduction system according to an embodiment of the present invention;
fig. 2 is a schematic view illustrating a first determination process of a selective catalytic reduction system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a second determination process of a selective catalytic reduction system according to an embodiment of the present invention;
fig. 4 is a schematic view illustrating a third determination process of a selective catalytic reduction system according to an embodiment of the present invention;
an icon: 1-an exhaust gas line; 2-a heat exchanger; 21-an exhaust gas inlet; 22-an exhaust outlet; 23-a heat exchange medium inlet; 24-a heat exchange medium outlet; 3-a heater; 4-a temperature sensor; 5-a selective catalytic reducer; 51-an inlet; 52-an outlet; 6-a steering valve group; 61-a third valve; 62-a fourth valve; 7-a reducing gas line; 8-an exhaust line; 9-a refrigerator; 10-a first valve; 11-a fifth valve; 12-a second valve; 13-a medium line; and 14-an air outlet pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. 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.
As shown in fig. 1, embodiments of the present invention provide a selective catalytic reduction system for treating engine exhaust, comprising:
the heat exchanger 2 is provided with an exhaust inlet 21, an exhaust outlet 22, a heat exchange medium inlet 23 and a heat exchange medium outlet 24;
the selective catalytic reducer 5, the selective catalytic reducer 5 is provided with an inlet 51 and an outlet 52, and the inlet 51 of the selective catalytic reducer 5 is connected with the exhaust outlet 22 through a pipeline;
a heater 3, the heater 3 being located between the inlet 51 of the selective catalytic reducer 5 and the duct of the exhaust gas outlet 22;
a temperature sensor 4, the temperature sensor 4 being provided at one side of the inlet 51 of the selective catalytic reduction device 5, for acquiring the temperature of the engine exhaust gas;
the steering valve group 6, the steering valve group 6 is arranged at the outlet 52 of the selective catalytic reducer 5, and the steering valve group 6 is used for controlling the outlet 52 of the selective catalytic reducer 5 to be selectively communicated with the heat exchange medium inlet 23 of the heat exchanger 2 or the external environment; when the diverter valve group 6 is in the first state, the outlet 52 of the selective catalytic reducer 5 is in communication with the outside environment; when the steering valve group 6 is in the second state, the outlet 52 of the selective catalytic reducer 5 is communicated with the heat exchange medium inlet 23 of the heat exchanger 2 through the medium pipeline 13;
the refrigerator 9 is used for conveying cold medium in the medium pipeline 13, and the outlet 52 of the refrigerator 9 is selectively communicated with or disconnected from the medium pipeline 13.
It should be noted that nitrogen oxides generated during engine exhaust are reduced by the selective catalytic reduction unit 5 to generate nitrogen gas and water, the engine exhaust enters the heat exchanger 2 through the exhaust gas pipeline 1, the engine exhaust flows through the heater 3 and the temperature sensor 4 and then enters the selective catalytic reduction unit 5, the diverter valve group 6 is disposed at the outlet 52 of the selective catalytic reduction unit 5, when the diverter valve group 6 is in the first state, the outlet 52 of the selective catalytic reduction unit 5 is communicated with the external environment, and the nitrogen oxides are discharged into the external environment, that is, discharged into the atmosphere through the diverter valve group 6 after being reduced. When the steering valve group 6 is in the second state, the outlet 52 of the selective catalytic reduction device 5 is communicated with the heat exchange medium inlet 23 of the heat exchanger 2 through the medium pipeline 13, nitrogen generated after reduction by the selective catalytic reduction device 5 enters the heat exchanger 2 through the medium pipeline 13 to be reused, and engine exhaust entering the heat exchanger 2 is subjected to heat exchange through the nitrogen, so that the heat utilization rate is improved, and more energy is saved. For example, when the engine exhaust temperature is low-temperature exhaust, the heat of nitrogen is used for heating the engine exhaust, so that the heat utilization rate is improved, and more energy is saved; when the exhaust temperature of the engine is high-temperature gas, the refrigerator 9 is used for refrigerating nitrogen, so that the nitrogen entering the heat exchanger 2 is used as a cold medium to refrigerate the exhaust gas of the engine, the heat utilization rate is improved, more energy is saved, and the bidirectional heat management of the engine is realized.
With continued reference to fig. 1, the following detailed description is provided for the specific operation of the selective catalytic reduction system provided by the embodiment of the present invention:
the temperature of the engine-out exhaust gas, which is also referred to as engine exhaust gas, which may be low or high, is not constant, where the low and high of the temperature of the engine exhaust gas refer to temperature range values of the reaction temperature in the selective catalytic reducer 5.
For example, the temperature sensor 4 is used for acquiring the temperature of the engine exhaust, when the temperature of the exhaust gas discharged by the engine is lower than T1, the engine enters the heat exchanger 2 through the exhaust gas pipeline 1, because the temperature of the exhaust gas discharged by the engine is lower than T1, the heater 3 is started to heat the exhaust gas discharged by the engine, the heated engine exhaust gas enters the selective catalytic reducer 5 to perform catalytic reduction reaction, and Nitrogen Oxides (NO) in the exhaust emission are obtained X ) Reduction of contaminants to N 2 And H 2 O, then closing the third valve 61 and opening the fourth valve 62 in the valve block 6, it being understood that the valve block 6 comprises the third valve 61 and the fourth valve 62; the third valve 61 is arranged at the outlet 52 of the selective catalytic reducer 5 and is used for controlling the connection and disconnection between the outlet 52 of the selective catalytic reducer 5 and the external environment; the fourth valve 62 is disposed between the outlet 52 of the selective catalytic reducer 5 and the first valve 10. N is a radical of 2 Enters the medium pipeline 13 for reuse, the first valve 10 is arranged at the outlet 52 of the refrigerator 9 and is used for controlling the on-off between the refrigerator 9 and the medium pipeline 13, the first valve 10 is closed, the refrigerator 9 does not work, N 2 The gas enters a heat exchange medium inlet 23 of the heat exchanger 2 along a medium pipeline 13, then flows out from a heat exchange medium outlet 24 of the heat exchanger 2 and enters the exhaust pipeline 8, a fifth valve 11 is closed, a second valve 12 is opened, and the second valve 12 is specifically arranged on the exhaust pipeline 8 and used for controlling the on-off of the exhaust pipeline 8; the exhaust pipeline 8 between the heat exchange medium outlet 24 of the heat exchanger 2 and the outlet 52 of the selective catalytic reduction device 5 is provided with an outlet pipe 14 communicated with the external environment, and the outlet pipe 14 is provided withA fifth valve 11 is arranged for controlling the on-off of the pipeline. N is a radical of hydrogen 2 Into the reducing gas line 7 and then to the outside environment.
The temperature sensor 4 is used for acquiring the exhaust temperature of the engine, when the exhaust temperature of the engine is higher than T2, the engine enters the heat exchanger 2 through the exhaust pipeline 1, because the exhaust temperature of the engine is higher than T2, the heater 3 is closed, the first valve 10 is opened, the first valve 10 is arranged at the outlet 52 of the refrigerator 9 and used for controlling the connection and disconnection between the refrigerator 9 and the medium pipeline 13, the refrigerator 9 is opened, cold air blown out by the refrigerator 9 enters from the heat exchange medium inlet 23 of the heat exchanger 2 and then flows out from the heat exchange medium outlet 24 of the heat exchanger 2 to enter the air outlet pipe 14, the exhaust gas of the engine is cooled through the cold air blown out by the refrigerator 9, the cooled exhaust gas of the engine enters the selective catalytic reducer 5 for catalytic reduction reaction, and Nitrogen Oxides (NO) in the exhaust emission are converted into nitrogen oxides X ) Reduction of contaminants to N 2 And H 2 O, then closing the third valve 61 and opening the fourth valve 62 in the valve block 6, it being understood that the valve block 6 comprises the third valve 61 and the fourth valve 62; the third valve 61 is arranged at the outlet 52 of the selective catalytic reducer 5 and is used for controlling the connection and disconnection between the outlet 52 of the selective catalytic reducer 5 and the external environment; the fourth valve 62 is disposed between the outlet 52 of the selective catalytic reducer 5 and the first valve 10. N is a radical of 2 Into the medium line 13 and opens the refrigerator 9 to N 2 Cooling is carried out, cold air blown out by the refrigerator 9 enters from a heat exchange medium inlet 23 of the heat exchanger 2 and then flows out from a heat exchange medium outlet 24 of the heat exchanger 2 to enter the air outlet pipe 14, the second valve 12 is closed, and the fifth valve 11 is opened, so that N is enabled 2 And exits the outlet pipe 14 to the external environment.
The temperature sensor 4 is used for acquiring the temperature of the exhaust gas of the engine, when the temperature of the exhaust gas discharged by the engine is between T1 and T2, the engine enters the heat exchanger 2 through the exhaust gas pipeline 1, the heater 3 and the refrigerator 9 are closed because the exhaust gas discharged by the engine is between T1 and T2, the exhaust gas discharged by the engine directly flows through the heat exchanger 2 to enter the selective catalytic reducer 5 for catalytic reduction reaction, and the exhaust gas discharged by the exhaust gas is dischargedNitrogen Oxides (NO) X ) Reduction of contaminants to N 2 And H 2 O, then the third valve 61 in the steering valve group 6 is opened and the fourth valve 62 is closed, N 2 Directly from the reducing gas line 7 to the external environment. It will be appreciated that the diverting valve group 6 comprises a third valve 61 and a fourth valve 62; the third valve 61 is arranged at the outlet 52 of the selective catalytic reducer 5 and is used for controlling the connection and disconnection between the outlet 52 of the selective catalytic reducer 5 and the external environment; the fourth valve 62 is disposed between the outlet 52 of the selective catalytic reducer 5 and the first valve 10.
The embodiment of the utility model provides an among the selective catalytic reduction system for temperature sensor 4 for acquireing engine exhaust temperature sets up all can from the engine to the optional position that gets into selective catalytic reduction ware 5, as long as can acquire the engine exhaust temperature before getting into selective catalytic reduction ware 5. For example, the temperature sensor 4 is disposed between the heater 3 and the inlet 51 of the selective catalytic reducer 5. For example, the temperature sensor 4 is provided between the exhaust gas outlet 22 of the heat exchanger 2 and the heater 3. For example, the temperature sensor 4 is provided at the inlet 51 of the selective catalytic reducer 5.
For the sake of simplicity of construction, the refrigerator 9 comprises an air cooler, i.e. an air cooling by means of which ambient air is to be used, which ambient air is directly taken from the heat exchange medium inlet 23 of the heat exchanger 2, so that the heat exchange is carried out in the heat exchanger 2.
Referring to fig. 2, a first schematic diagram of a determination process of a selective catalytic reduction system according to an embodiment of the present invention;
s201: acquiring the exhaust temperature of an engine;
s202: judging whether the exhaust temperature of the engine is less than T1, and executing S203 when the exhaust temperature of the engine is less than T1; otherwise, executing S201;
s203: turning on the heater 3;
s204: closing the first valve 10, the third valve 61 and the fifth valve 11;
s205: the refrigerator 9 is turned off;
s206: opening the fourth valve 62 and the second valve 12;
referring to fig. 3, fig. 3 is a schematic diagram of a second determination process of the selective catalytic reduction system according to an embodiment of the present invention;
s301: acquiring the exhaust temperature of an engine;
s302: judging whether the exhaust temperature of the engine is more than or equal to T1 and less than or equal to T2; when the exhaust temperature of the engine is greater than or equal to T1 and less than or equal to T2, executing S303; otherwise, executing S301;
s303: opening the third valve 61;
s304: closing the first valve 10, the second valve 12, the fourth valve 62 and the fifth valve 11;
s305: the heater 3 is turned off;
s306: the refrigerator 9 is switched off.
Referring to fig. 4, fig. 4 is a schematic diagram illustrating a third determination process of the selective catalytic reduction system according to an embodiment of the present invention;
s401: acquiring the exhaust temperature of an engine;
s402: judging whether the exhaust temperature of the engine is greater than T2; when the exhaust temperature of the engine is greater than T2, S403 is executed; otherwise, executing S401;
s403: turning on the refrigerator 9;
s404: closing the second valve 12 and the fourth valve 62;
s405: the heater 3 is turned off.
In a second aspect, embodiments of the present invention provide an engine system, including the selective catalytic reduction system of any one of the first aspects.
It will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A selective catalytic reduction system for treating engine exhaust comprising:
the heat exchanger is provided with an exhaust inlet, an exhaust outlet, a heat exchange medium inlet and a heat exchange medium outlet;
a selective catalytic reducer having an inlet and an outlet, the inlet of the selective catalytic reducer being connected to the exhaust outlet conduit;
a heater located between the inlet of the selective catalytic reducer and the duct of the exhaust outlet;
the temperature sensor is arranged on one side of the inlet of the selective catalytic reducer and used for acquiring the temperature of the engine exhaust;
the steering valve group is arranged at an outlet of the selective catalytic reducer and is used for controlling the outlet of the selective catalytic reducer to be selectively communicated with a heat exchange medium inlet of the heat exchanger or an external environment; when the diverter valve block is in a first state, the outlet of the selective catalytic reducer is communicated with the external environment; when the steering valve group is in a second state, the outlet of the selective catalytic reducer is communicated with the heat exchange medium inlet of the heat exchanger through a medium pipeline;
the refrigerator is used for conveying cold media in the medium pipeline, and an outlet of the refrigerator is selectively communicated with or disconnected from the medium pipeline.
2. The selective catalytic reduction system of claim 1, further comprising: the first valve is arranged at an outlet of the refrigerator and used for controlling the connection and disconnection between the refrigerator and the medium pipeline.
3. The SCR system of claim 2, wherein the heat exchange medium outlet of the heat exchanger is connected with the outlet of the SCR through an exhaust pipeline, and a second valve for controlling the on-off of the pipeline is arranged on the exhaust pipeline.
4. The SCR system of claim 3, wherein the set of diverter valves includes a third valve and a fourth valve;
the third valve is arranged at the outlet of the selective catalytic reducer and used for controlling the connection and disconnection between the outlet of the selective catalytic reducer and the external environment;
the fourth valve is disposed between an outlet of the selective catalytic reducer and the first valve.
5. The SCR system of claim 1, wherein the temperature sensor is disposed between the heater and an inlet of the SCR.
6. The SCR system of claim 1, wherein the temperature sensor is disposed between an exhaust outlet of the heat exchanger and the heater.
7. The SCR system of claim 1, wherein the temperature sensor is disposed at an inlet of the SCR.
8. The SCR system of claim 1, wherein the chiller comprises an air cooler.
9. The SCR system according to claim 3, wherein an outlet pipe communicating with the external environment is provided to an exhaust pipe between the outlet of the heat exchange medium of the heat exchanger and the outlet of the SCR, and a fifth valve for controlling the on/off of the pipe is provided to the outlet pipe.
10. An engine system comprising the selective catalytic reduction system of any one of claims 1-9.
CN202223012200.8U 2022-11-11 2022-11-11 Selective catalytic reduction system and engine system Active CN218669510U (en)

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Application Number Priority Date Filing Date Title
CN202223012200.8U CN218669510U (en) 2022-11-11 2022-11-11 Selective catalytic reduction system and engine system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202223012200.8U CN218669510U (en) 2022-11-11 2022-11-11 Selective catalytic reduction system and engine system

Publications (1)

Publication Number Publication Date
CN218669510U true CN218669510U (en) 2023-03-21

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Application Number Title Priority Date Filing Date
CN202223012200.8U Active CN218669510U (en) 2022-11-11 2022-11-11 Selective catalytic reduction system and engine system

Country Status (1)

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CN (1) CN218669510U (en)

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