CN108979806B - SCR catalytic converter and box thereof - Google Patents

SCR catalytic converter and box thereof Download PDF

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Publication number
CN108979806B
CN108979806B CN201811130599.5A CN201811130599A CN108979806B CN 108979806 B CN108979806 B CN 108979806B CN 201811130599 A CN201811130599 A CN 201811130599A CN 108979806 B CN108979806 B CN 108979806B
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CN
China
Prior art keywords
box
shell
tail gas
housing
catalytic converter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201811130599.5A
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Chinese (zh)
Other versions
CN108979806A (en
Inventor
刘刚
翟浩
赵甲运
李建东
尹东东
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weichai Power Co Ltd
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Weichai Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Weichai Power Co Ltd filed Critical Weichai Power Co Ltd
Priority to CN201811130599.5A priority Critical patent/CN108979806B/en
Publication of CN108979806A publication Critical patent/CN108979806A/en
Application granted granted Critical
Publication of CN108979806B publication Critical patent/CN108979806B/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The invention provides an SCR catalytic converter and a box body thereof, wherein the box body comprises an inner box (1) and an outer box, a box shell of the outer box comprises an inner shell (21) and an outer shell (22), a first accommodating cavity is formed on the inner surface of the inner shell (21), a tail gas cavity is formed between the outer surface of the inner shell (21) and the inner surface of the outer shell (22), and an exhaust pipe (221) communicated with the tail gas cavity is arranged at the top of the outer shell (22); the inner box (1) is located in the first accommodating cavity, the inner box (1) is provided with a second accommodating cavity for installing a catalyst carrier assembly, the position, close to the top, of the inner box (1) is provided with an air inlet pipe (11) extending outwards to penetrate through the outer box, and the bottom of the inner box (1) is provided with an air outlet pipe extending downwards and communicated with the tail gas cavity. The box body provided by the invention can enable the SCR catalytic converter to achieve the effect of raising the exhaust temperature in a more energy-saving and efficient mode, so that the oxidation-reduction reaction of exhaust aftertreatment is carried out in a better environment, and the emission level is favorably raised.

Description

SCR catalytic converter and box thereof
Technical Field
The invention relates to the technical field of diesel engines, in particular to an SCR catalytic converter and a box body thereof.
Background
Regulations concerning emissions from automobiles are now becoming more stringent and there is a continuing need for post-treatment of automobile emissions. SCR catalytic reduction technology is an important technical route for reducing NOx emissions from diesel engines and meeting national IV and above emission regulations, and SCR catalytic converters are also becoming the most widely used automobile exhaust treatment devices.
The SCR catalytic converter needs to react most fully at the exhaust temperature to a certain extent, but the exhaust temperature is not ideal according to the current general actual operation conditions of the vehicle, and especially in urban and suburban operation conditions, the exhaust temperature cannot reach the optimal temperature of SCR conversion efficiency.
In order to raise the temperature to reach or approach the optimal temperature of the SCR conversion efficiency, two modes are respectively that a layer of heat insulation material is wrapped outside the SCR box and an electric heating device is arranged on the SCR catalytic converter, however, the temperature raising effect is not great by adopting the heat insulation material mode, and the temperature can not be controlled; the electronic heating mode is adopted, a heating device and a control system are additionally arranged, so that the installation cost and the later maintenance cost are increased, the electric quantity of an automobile is consumed during heating, and the energy consumption is also brought.
In summary, how to more energy-saving and high-efficiency raise the exhaust temperature to reach or approach the optimal temperature of the SCR conversion efficiency becomes a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of this, the present invention provides an SCR catalytic converter and a case thereof, by which the SCR catalytic converter can achieve the effect of raising the exhaust temperature in a more energy-saving and efficient manner, so that the oxidation-reduction reaction of exhaust aftertreatment is performed in a better environment, which is beneficial to raising the emission level.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the box body of the SCR catalytic converter comprises an inner box and an outer box, wherein a box shell of the outer box comprises an inner shell and an outer shell, a first accommodating cavity is formed on the inner surface of the inner shell, a tail gas cavity is formed between the outer surface of the inner shell and the inner surface of the outer shell, and an exhaust pipe communicated with the tail gas cavity is arranged at the top of the outer shell;
the inner box is located in the first accommodating cavity, the inner box is provided with a second accommodating cavity for installing a catalyst carrier assembly, an air inlet pipe which extends outwards to penetrate out of the outer box is arranged at a position, close to the top, of the inner box, and an air outlet pipe which extends downwards and is communicated with the tail gas cavity is arranged at the bottom of the inner box.
Preferably, in the above case, a distance between an outer surface of the inner case and an inner surface of the outer case is 20mm to 50mm.
Preferably, in the above-mentioned case, the housing has a bypass pipe that communicates the tail gas chamber with the outside atmosphere, and a relief valve is provided on the bypass pipe.
Preferably, in the above-mentioned case, the inlet of the bypass pipe is located at a position where the bottom of the housing is opposite to the outlet pipe.
Preferably, in the above-mentioned case, the safety valve is an electromagnetic valve, an air pressure sensor is disposed on the exhaust pipe, and the pressure sensor is electrically connected with the safety valve.
Preferably, in the above-mentioned case, a temperature sensor is provided on the housing, and the temperature sensor is electrically connected to the safety valve.
Preferably, in the above case, the inner case and the outer case are both rectangular parallelepiped.
Preferably, in the above case, the temperature sensor includes a first temperature sensor located at a top surface of the housing and a second temperature sensor located at a side surface of the housing.
Preferably, in the above-mentioned case, a drain pipe communicating with the off-gas chamber is provided at a bottom of the housing.
An SCR catalytic converter comprising a housing as disclosed in any one of the above.
According to the technical scheme, in the case body for the SCR catalytic converter, the inner case for containing the catalyst carrier assembly is positioned in the inner case of the outer case, the tail gas cavity is formed between the inner case and the outer case of the outer case, the position, close to the top, of the inner case is provided with the air inlet pipe extending outwards to extend out of the outer case, the bottom of the inner case is provided with the air outlet pipe extending downwards and communicated with the tail gas cavity, and meanwhile, the top of the outer case is provided with the air outlet pipe communicated with the tail gas cavity, so that the tail gas of the engine enters the inner case from the air inlet pipe firstly, enters the tail gas cavity from the air outlet pipe after catalytic reduction is completed, then flows through the tail gas cavity from bottom to top and reaches the air outlet pipe at the top of the outer case, and finally is discharged from the air outlet pipe.
Because the inner box is arranged in the inner shell of the outer box, and the tail gas cavity is formed by the inner shell and the outer shell of the outer box, the tail gas cavity is protected on the outer side of the inner box, and the tail gas is filled in the tail gas cavity to form a closed gas wall. Therefore, after the box body provided by the invention is adopted, the SCR catalytic converter can be used for reutilizing the tail gas exhausted by the engine, so that the effect of improving the exhaust temperature is achieved in a more energy-saving and efficient mode, the oxidation-reduction reaction favorable for exhaust aftertreatment is carried out in a better environment, and a better emission level is obtained.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a cross-sectional view of a housing for an SCR catalytic converter provided by an embodiment of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
fig. 3 is a schematic view of an external appearance of a case for an SCR catalytic converter according to an embodiment of the present invention.
Marked in the figure as:
1. an inner box; 11. an air inlet pipe; 21. an inner case; 22. a housing; 221. an exhaust pipe; 222. a bypass pipe; 223. a drain pipe; 31. a first temperature sensor; 32. and a second temperature sensor.
Detailed Description
For ease of understanding, the present invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 to 3, fig. 1 is a cross-sectional view of a case for an SCR catalytic converter according to an embodiment of the present invention, fig. 2 is a cross-sectional view A-A of fig. 1, and fig. 3 is an external schematic view of a case for an SCR catalytic converter according to an embodiment of the present invention.
The box body for the SCR catalytic converter provided by the embodiment of the invention comprises an inner box 1 and an outer box, wherein a box shell of the outer box comprises an inner shell 21 and an outer shell 22, a first accommodating cavity is formed on the inner surface of the inner shell 21, a tail gas cavity is formed between the outer surface of the inner shell 21 and the inner surface of the outer shell 22, and an exhaust pipe 221 communicated with the tail gas cavity is arranged at the top of the outer shell 22; the inner box 1 is located in the first accommodating cavity, the inner box 1 is provided with a second accommodating cavity for installing a catalyst carrier assembly, an air inlet pipe 11 which extends outwards and penetrates out of the outer box is arranged at a position, close to the top, of the inner box 1, and an air outlet pipe (not marked in the figure) which extends downwards and is communicated with the tail gas cavity is arranged at the bottom of the inner box 1.
When the exhaust gas catalytic reduction device is used, the tail gas of the engine firstly enters the inner box 1 through the air inlet pipe 11, then enters the tail gas cavity through the air outlet pipe after catalytic reduction is finished, then flows through the tail gas cavity from bottom to top to reach the exhaust pipe 221 at the top of the outer box, and finally is discharged from the exhaust pipe 221.
Because the inner box 1 is positioned in the inner shell 21 of the outer box, and the tail gas cavity is formed by the inner shell 21 and the outer shell 22 of the outer box, the tail gas cavity is protected on the outer side of the inner box 1, and the tail gas is filled in the tail gas cavity to form a closed gas wall. Therefore, after the box body provided by the invention is adopted, the SCR catalytic converter can be used for reutilizing the tail gas exhausted by the engine, so that the effect of improving the exhaust temperature is achieved in a more energy-saving and efficient mode, the oxidation-reduction reaction favorable for exhaust aftertreatment is carried out in a better environment, and a better emission level is obtained.
In a specific practical application, the distance between the outer surface of the inner shell 21 and the inner surface of the outer shell 22 may be 20mm to 50mm.
In order to improve safety, a bypass pipe 222 for connecting the exhaust chamber with the outside atmosphere may be provided on the housing 22, and a safety valve may be provided on the bypass pipe 222, so that when the exhaust pressure is too high, the exhaust gas may be directly discharged to the atmosphere through the bypass pipe. As shown in FIG. 1, the inlet of the bypass tube 222 is generally disposed at a position opposite the outlet tube at the bottom of the housing 22.
In a specific practical application, the safety valve may be a solenoid valve, and the air pressure sensor is disposed on the exhaust pipe 221 and electrically connected with the safety valve.
When the safety valve adopts an electromagnetic valve, a temperature sensor electrically connected with the safety valve can be further arranged on the shell 22, so that when the exhaust temperature is detected to exceed a set value, the safety valve can be controlled to be opened, and the exhaust temperature is prevented from being too high.
Both the inner case 1 and the outer case may have a rectangular parallelepiped shape, as shown in fig. 1 and 3, and in this embodiment, the temperature sensor includes a first temperature sensor 31 located at the top surface of the housing 22 and a second temperature sensor 32 located at the side surface of the housing 22, which is advantageous in improving accuracy of temperature control.
As shown in fig. 1 and 2, in order to periodically discharge the accumulated water gradually formed in the tail gas chamber, a drain pipe 223 communicating with the tail gas chamber may be provided at the bottom of the housing 22, and a drain valve may be provided at the drain pipe 223.
The invention also provides an SCR catalytic converter, which comprises the box body disclosed in the embodiment. The case disclosed in the above embodiment has the above technical effects, so the SCR catalytic converter having the case also has the above technical effects, and will not be described herein again.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to the embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The box body of the SCR catalytic converter is characterized by comprising an inner box (1) and an outer box, wherein a box shell of the outer box comprises an inner shell (21) and an outer shell (22), a first accommodating cavity is formed on the inner surface of the inner shell (21), a tail gas cavity is formed between the outer surface of the inner shell (21) and the inner surface of the outer shell (22), and an exhaust pipe (221) communicated with the tail gas cavity is arranged at the top of the outer shell (22);
the inner box (1) is located in the first accommodating cavity, the inner box (1) is provided with a second accommodating cavity for installing a catalyst carrier assembly, an air inlet pipe (11) extending outwards to penetrate out of the outer box is arranged at a position, close to the top, of the inner box (1), and an air outlet pipe extending downwards and communicated with the tail gas cavity is arranged at the bottom of the inner box (1).
2. A tank according to claim 1, characterized in that the distance between the outer surface of the inner shell (21) and the inner surface of the outer shell (22) is 20-50 mm.
3. The tank according to claim 1, characterized in that the housing (22) has a bypass pipe (222) communicating the tail gas chamber with the outside atmosphere, the bypass pipe (222) being provided with a safety valve.
4. A tank according to claim 3, characterized in that the inlet of the bypass pipe (222) is located at a position opposite the outlet pipe at the bottom of the casing (22).
5. The tank according to claim 4, characterized in that the safety valve is a solenoid valve, and that the exhaust pipe (221) is provided with a gas pressure sensor, which is electrically connected to the safety valve.
6. The tank according to claim 5, characterized in that a temperature sensor is provided on the housing (22), said temperature sensor being electrically connected to the safety valve.
7. The tank according to claim 6, characterized in that the inner tank (1) and the outer tank are both cuboid.
8. The cabinet according to claim 7, wherein the temperature sensor comprises a first temperature sensor (31) located at the top surface of the housing (22) and a second temperature sensor (32) located at the side surface of the housing (22).
9. The tank according to any one of claims 1 to 8, characterized in that the bottom of the housing (22) has a drain (223) communicating with the off-gas chamber.
10. An SCR catalytic converter comprising a housing according to any one of claims 1 to 9.
CN201811130599.5A 2018-09-27 2018-09-27 SCR catalytic converter and box thereof Active CN108979806B (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN201811130599.5A CN108979806B (en) 2018-09-27 2018-09-27 SCR catalytic converter and box thereof

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CN108979806B true CN108979806B (en) 2024-01-16

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CN209067318U (en) * 2018-09-27 2019-07-05 潍柴动力股份有限公司 A kind of SCR catalytic converter and its cabinet

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