CN218325002U - Tail gas treatment device of gasoline engine test bed - Google Patents
Tail gas treatment device of gasoline engine test bed Download PDFInfo
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- CN218325002U CN218325002U CN202222795163.6U CN202222795163U CN218325002U CN 218325002 U CN218325002 U CN 218325002U CN 202222795163 U CN202222795163 U CN 202222795163U CN 218325002 U CN218325002 U CN 218325002U
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Abstract
The utility model discloses a tail gas treatment device of a gasoline engine test bed, which comprises a tail gas input pipe and a fresh air input pipe, wherein the tail gas input pipe is internally provided with an oxygen concentration detection device, one end of the tail gas input pipe is communicated with the exhaust end of an engine, the other end of the tail gas input pipe is connected with an oxidation type catalytic converter, and the oxidation type catalytic converter is connected with a tail gas discharge pipe; the fresh air input pipe is communicated with the tail gas input pipe, and an air volume adjusting device is arranged on the fresh air input pipe. The utility model discloses an oxidation type catalytic converter carries out oxidation catalysis to CO and HC to adjust new trend intake through air regulation device, for oxidation type catalytic converter provides the required oxygen of oxidation reaction, make the mist oxygen content reach the catalytic reaction requirement, the utility model discloses purifying effect to CO and HC is better, and purification efficiency is high, effectively reduces carbon monoxide and hydrocarbon's emission, is favorable to the environmental protection.
Description
Technical Field
The utility model belongs to the technical field of the engine exhaust handles, concretely relates to tail gas processing apparatus of gasoline engine test bench.
Background
Gasoline engines (Gasoline engines) are engines that convert internal energy into kinetic energy using Gasoline as a fuel. Because the gasoline has small viscosity and quick evaporation, the gasoline can be sprayed into the cylinder by a gasoline injection system, and after the gasoline is compressed to reach a certain temperature and pressure, the gasoline is ignited by a spark plug to ensure that the gas expands to do work. The gasoline engine is characterized by high rotating speed, simple structure, light weight, low cost, stable operation and convenient use and maintenance. Gasoline engines are used in large numbers in automobiles, particularly in small automobiles.
With the stricter environmental regulations, the pollution of the engine exhaust pollutants to the environment and the harm to the human health are more and more paid attention by people. Therefore, the research on the principle, method and technology of catalytic purification of engine exhaust is one of the hot and difficult subjects in the world environment field today. The engine testing bench is usually arranged in each automobile enterprise, research and development center and universities, and each performance index, parameter and various characteristic curves of the engine are measured on the engine testing bench according to a specified testing method. In the test process of the engine, the working conditions of the engine under various extreme conditions need to be tested, the engine is often in a full-load or even overload state in the test process, and a large amount of tail gas can be discharged in the test process. To prevent environmental pollution, these exhaust gases need to be treated, especially for the purification of carbon monoxide (CO) and Hydrocarbons (HC).
Chinese patent CN110160795A discloses a tail gas treatment system of a gasoline engine pedestal, which comprises a tail gas discharge test module and a header pipe; the tail exhaust test module comprises an exhaust pipeline, and a pre-catalytic three-way catalytic device, a main three-way catalytic device, a silencer, a DOC device, a decomposition pipe, an SCR device, a high-temperature fan, a high-temperature cut-off valve and a washing tower are sequentially arranged on the exhaust pipeline; a noise reduction room for reducing noise is arranged outside the high-temperature fan, and the tail end of the exhaust pipeline is communicated with the main pipe; the main pipe is sequentially provided with a metal blanket filter, a main fan and a silencer; the tail end of the main pipe is communicated with the chimney; the scheme can treat the harmful gas in the tail gas in the bench test process of the gasoline engine to the value which can be discharged under the Beijing standard; the catalytic conversion capacity is strong, and the efficiency is high; the decomposing pipe adopts a beam waist structure to accelerate the flow velocity and reduce the crystallization risk of urea; and the modularized structure is adopted, so that the maintenance is easy and the reliability is good.
Although the tail gas treatment system of the gasoline engine rack can purify two pollutants of CO and HC to a certain degree in tail gas, fresh air is not introduced into an exhaust pipeline, so that the actual purification effect of the two pollutants of CO and HC in the tail gas is poor, the purification efficiency is low, and the emission of the two pollutants of CO and HC in the tail gas exceeds the standard. Therefore, how to effectively purify two pollutants of CO and HC and reduce the tail gas pollution of a gasoline engine test bed is a series of problems which need to be solved by the technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a tail gas processing apparatus of gasoline engine test bench for solve the above-mentioned problem that exists among the prior art.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a tail gas treatment device of a gasoline engine test bed comprises a tail gas input pipe and a fresh air input pipe, wherein an oxygen concentration detection device is arranged in the tail gas input pipe, one end of the tail gas input pipe is communicated with an exhaust end of an engine, the other end of the tail gas input pipe is connected with an oxidation type catalytic converter, and the oxidation type catalytic converter is connected with a tail gas discharge pipe; the fresh air input pipe is communicated with the tail gas input pipe, and an air volume adjusting device is arranged on the fresh air input pipe.
As an optional design structure of the technical scheme, the air volume adjusting device comprises an air volume adjusting valve, the air volume adjusting valve is arranged on the fresh air input pipe, the air volume adjusting valve is connected with a controller, and the controller is connected with the oxygen concentration detection device.
As an optional design structure of the above technical solution, the exhaust gas input pipe is provided with a heating device, and the heating device is used for heating the exhaust gas in the exhaust gas input pipe.
As an optional design structure of the technical scheme, a temperature sensor is arranged in the tail gas input pipe and used for detecting the temperature of the tail gas heated by the heating device, the temperature sensor is connected with the controller, and the controller is connected with the heating device.
As an optional design structure of the technical scheme, the heating device comprises an electric heating tube, the electric heating tube is arranged in the tail gas input tube, and is connected with a control switch, and the control switch is connected with the controller.
As an optional design structure of the technical scheme, the tail gas input pipe is provided with a first hydrocarbon sensor and a first carbon monoxide sensor, and the tail gas discharge pipe is provided with a second hydrocarbon sensor and a second carbon monoxide sensor.
As an optional design structure of the technical scheme, the exhaust gas purification device further comprises a bypass pipe, wherein two ends of the bypass pipe are respectively communicated with the exhaust gas input pipe and the exhaust gas discharge pipe, and a first control valve is arranged on the bypass pipe.
As an optional design structure of the technical scheme, the tail gas input pipe is connected with the gas inlet end of the oxidation type catalytic converter through a flange, a second control valve is arranged at one end, close to the oxidation type catalytic converter, of the tail gas input pipe, the tail gas discharge pipe is connected with the exhaust end of the oxidation type catalytic converter through a flange, and a third control valve is arranged at one end, close to the oxidation type catalytic converter, of the tail gas discharge pipe.
As an optional design structure of the technical scheme, one end of the tail gas input pipe is connected with the exhaust end of the engine through a flange, and a graphite sealing gasket is arranged between the flanges of the tail gas input pipe and the engine.
As an optional design structure of the technical scheme, the tail gas discharge pipe is connected with a smoke exhaust tube.
The utility model has the advantages that:
the utility model provides a tail gas processing apparatus of gasoline engine test bench, it adopts oxidation type catalytic converter to carry out oxidation catalysis to CO and HC to adjust new trend intake through air regulation device, for oxidation type catalytic converter provides the required oxygen of oxidation reaction, make the mist oxygen content reach the catalytic reaction requirement, the utility model discloses purifying effect to CO and HC is better, and purification efficiency is high, effectively reduces carbon monoxide and hydrocarbon's emission, is favorable to the environmental protection.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
In the figure: 1-tail gas input pipe; 2-fresh air input pipe; 3-an oxygen concentration detection device; a 4-oxidation type catalytic converter; 5-tail gas discharge pipe; 6-air volume adjusting valve; 7-a heating device; 8-a temperature sensor; 9-a first hydrocarbon sensor; 10-a first carbon monoxide sensor; 11-a second hydrocarbon sensor; 12-a second carbon monoxide sensor; 13-a bypass pipe; 14-a first control valve; 15-a second control valve; 16-a third control valve; and 17-a smoke exhaust tube.
Detailed Description
Examples
As shown in fig. 1, this embodiment provides an engine test bench's tail gas processing apparatus, including tail gas input tube 1 and new trend input tube 2, be equipped with oxygen concentration detection device 3 in the tail gas input tube 1, oxygen concentration detection device 3 adopts oxygen sensor, and it is arranged in detecting oxygen concentration in the tail gas, and the inlet end of tail gas input tube 1 communicates with the exhaust end of engine, specifically, flange joint is passed through with the exhaust end of engine to the one end of tail gas input tube 1, and is provided with graphite packing pad between the flange of the two, can avoid gasoline engine tail gas to leak and get into the problem that causes indoor CO to exceed standard between the experiment.
The tail gas of the engine can enter the tailIn the gas input pipe 1, the exhaust end of the tail gas input pipe 1 is connected with an oxidation type catalytic converter 4, the oxidation type catalytic converter 4 is connected with a tail gas discharge pipe 5, the tail gas discharge pipe 5 is connected with a smoke exhaust pipe 17, and the treated tail gas is discharged through the smoke exhaust pipe 17. The Oxidation type catalytic converter 4 is called DOC (Diesel Oxidation Catalyst) for short, the air inlet end of the Oxidation type catalytic converter 4 is connected with the exhaust end of the exhaust gas input pipe 1, the exhaust end of the Oxidation type catalytic converter 4 is connected with the air inlet end of the exhaust gas discharge pipe 5, and the Oxidation type catalytic converter 4 can convert carbon monoxide (CO) and Hydrocarbon (HC) in the exhaust gas input pipe 1 into harmless water (H) through Oxidation reaction 2 0) And carbon dioxide (CO) 2 ) And is discharged through a tail gas discharge pipe 5, so that the tail gas pollution is reduced.
Fresh air input tube 2 and tail gas input tube 1 intercommunication are equipped with air regulation device on the fresh air input tube 2. The inlet end of the fresh air input pipe 2 is connected with fresh air, the exhaust end of the fresh air input pipe 2 is communicated with the tail gas input pipe 1, so that the fresh air is conveyed to the tail gas input pipe 1 to be mixed with tail gas, and the air volume adjusting device is used for adjusting the fresh air inlet volume, providing oxygen required by oxidation reaction for the oxidation type catalytic converter 4, and reducing the emission of carbon monoxide and hydrocarbon.
As an alternative, the air volume adjusting device comprises an air volume adjusting valve 6, the air volume adjusting valve 6 is arranged on the fresh air input pipe 2, and the air volume adjusting valve 6 is connected with a controller which is connected with the oxygen concentration detection device 3. The fresh air input pipe 2 is provided with a fan, the fan conveys fresh air to the fresh air input pipe 2, and the fresh air inlet volume of the fresh air input pipe 2 is adjusted by controlling the valve opening of the air volume adjusting valve 6, so that the catalytic reaction of carbon monoxide and hydrocarbon is facilitated. The oxygen concentration detection device 3 can detect the oxygen concentration in the tail gas, and when the oxygen concentration in the tail gas input pipe 1 is proper, the fan and the air quantity regulating valve 6 are kept in a closed state; when the oxygen concentration in the tail gas input pipe 1 is too low, the fan is started, and the controller provides sufficient oxygen for the oxidation type catalytic converter 4 by adjusting the valve opening of the air volume adjusting valve 6.
In order to increase the efficiency of the catalytic reaction of carbon monoxide and hydrocarbons, the exhaust gas supply line 1 is provided with a heating device 7, the heating device 7 being used to heat the exhaust gas in the exhaust gas supply line 1. Specifically, the heating device 7 comprises an electric heating tube, the electric heating tube is arranged in the tail gas input tube 1, and the electric heating tube is connected with a control switch, and the control switch is connected with the controller. The control switch can adopt a relay, and the controller controls the switch of the electric heating tube through the control switch, so that the electric heating tube heats the tail gas.
Be equipped with temperature sensor 8 in the tail gas input tube 1, temperature sensor 8 is used for detecting the temperature of tail gas after heating through heating device 7, temperature sensor 8 with the controller is connected, the controller is connected with heating device 7. The temperature sensor 8 is arranged at the air inlet end of the oxidation type catalytic converter 4, the temperature sensor 8 monitors the temperature of the air inlet end of the oxidation type catalytic converter 4, and when the temperature sensor 8 detects that the temperature of the tail gas is lower (lower than that of the oxidation type catalytic converter 4), the controller controls the electric heating tube to be opened so that the electric heating tube heats the tail gas; when the temperature sensor 8 detects that the temperature of the tail gas is higher (higher than the required value of the oxidation type catalytic converter 4), the controller controls the electric heating pipe to be closed, so that the electric heating pipe stops heating the tail gas.
In the present embodiment, the exhaust gas supply line 1 is provided with a first hydrocarbon sensor 9 and a first carbon monoxide sensor 10, and the exhaust gas discharge line 5 is provided with a second hydrocarbon sensor 11 and a second carbon monoxide sensor 12. The first hydrocarbon sensor 9 is used for monitoring the content of hydrocarbons in the tail gas input pipe 1, the first carbon monoxide sensor 10 is used for monitoring the content of carbon monoxide in the tail gas input pipe 1, the second hydrocarbon sensor 11 is used for monitoring the content of hydrocarbons in the tail gas discharge pipe 5, and the second carbon monoxide sensor 12 is used for monitoring the content of carbon monoxide in the tail gas discharge pipe 5, so that a user can conveniently know the changes of hydrocarbons and carbon monoxide.
The tail gas treatment device also comprises a bypass pipe 13, two ends of the bypass pipe 13 are respectively communicated with the tail gas input pipe 1 and the tail gas discharge pipe 5, and the bypass pipe 13 is provided with a first control valve 14. The inlet end of the tail gas input pipe 1 and the oxidation type catalytic converter 4 are connected through a flange, one end of the tail gas input pipe 1, which is close to the oxidation type catalytic converter 4, is provided with a second control valve 15, the exhaust end of the tail gas discharge pipe 5 and the oxidation type catalytic converter 4 are connected through a flange, and one end of the tail gas discharge pipe 5, which is close to the oxidation type catalytic converter 4, is provided with a third control valve 16. When the oxidation catalytic converter 4 needs to be repaired or replaced, the second control valve 15 and the third control valve 16 are closed, the first control valve 14 is opened, and the exhaust gas enters the exhaust gas discharge pipe 5 from the bypass pipe 13.
The utility model provides a tail gas processing apparatus of gasoline engine test bench, it adopts oxidation type catalytic converter 4 to carry out oxidation catalysis to CO and HC to adjust new trend intake through air regulation device, for oxidation type catalytic converter 4 provides the required oxygen of oxidation reaction, make the mist oxygen content reach the catalytic reaction requirement, the utility model discloses purifying effect to CO and HC is better, and purification efficiency is high, effectively reduces carbon monoxide and hydrocarbon's emission, is favorable to the environmental protection.
In the description of the present invention, the terms "mounting", "connecting", "fixing", etc. should be understood in a broad sense, and may be fixedly connected, detachably connected, or integrated; may be a mechanical or electrical connection; they may be directly connected or indirectly connected through an intermediate medium, or they may be connected through the inside of two elements or through the interaction relationship between two elements, and those skilled in the art will understand the specific meaning of the above terms in the present invention. Furthermore, the particular features, structures, etc. described in the examples can be included in at least one implementation and can be combined by one skilled in the art without conflicting therewith. The protection scope of the present invention is not limited to the above specific embodiments, and according to the basic technical idea of the present invention, the ordinary technical personnel in the field need not through creative work, and the conceivable embodiments all belong to the protection scope of the present invention.
Claims (10)
1. The tail gas treatment device of the gasoline engine test bed is characterized by comprising a tail gas input pipe (1) and a fresh air input pipe (2), wherein an oxygen concentration detection device (3) is arranged in the tail gas input pipe (1), one end of the tail gas input pipe (1) is communicated with an exhaust end of an engine, the other end of the tail gas input pipe (1) is connected with an oxidation type catalytic converter (4), and the oxidation type catalytic converter (4) is connected with a tail gas discharge pipe (5); the fresh air input pipe (2) is communicated with the tail gas input pipe (1), and an air volume adjusting device is arranged on the fresh air input pipe (2).
2. The tail gas treatment device of the gasoline engine test bench according to claim 1, characterized in that the air volume adjusting device comprises an air volume adjusting valve (6), the air volume adjusting valve (6) is arranged on the fresh air input pipe (2), the air volume adjusting valve (6) is connected with a controller, and the controller is connected with the oxygen concentration detection device (3).
3. The exhaust gas treatment device of a gasoline engine test stand according to claim 2, characterized in that the exhaust gas inlet pipe (1) is equipped with a heating device (7), the heating device (7) being used for heating the exhaust gas in the exhaust gas inlet pipe (1).
4. The tail gas treatment device of the gasoline engine test bench according to claim 3, characterized in that a temperature sensor (8) is arranged in the tail gas input pipe (1), the temperature sensor (8) is used for detecting the temperature of the tail gas after being heated by the heating device (7), the temperature sensor (8) is connected with the controller, and the controller is connected with the heating device (7).
5. The tail gas treatment device of the gasoline engine test bench according to claim 4, characterized in that the heating device (7) comprises an electric heating tube, the electric heating tube is arranged in the tail gas input tube (1), the electric heating tube is connected with a control switch, and the control switch is connected with the controller.
6. The exhaust gas treatment device of a gasoline engine test bench according to claim 1, characterized in that the exhaust gas inlet pipe (1) is provided with a first hydrocarbon sensor (9) and a first carbon monoxide sensor (10), and the exhaust gas outlet pipe (5) is provided with a second hydrocarbon sensor (11) and a second carbon monoxide sensor (12).
7. The tail gas treatment device of the gasoline engine test bench according to claim 1, characterized in that the device further comprises a bypass pipe (13), two ends of the bypass pipe (13) are respectively communicated with the tail gas input pipe (1) and the tail gas discharge pipe (5), and the bypass pipe (13) is provided with a first control valve (14).
8. The tail gas treatment device of the gasoline engine test bench according to claim 7, wherein the tail gas input pipe (1) is connected with the air inlet end of the oxidation type catalytic converter (4) through a flange, a second control valve (15) is arranged at one end of the tail gas input pipe (1) close to the oxidation type catalytic converter (4), the tail gas discharge pipe (5) is connected with the exhaust end of the oxidation type catalytic converter (4) through a flange, and a third control valve (16) is arranged at one end of the tail gas discharge pipe (5) close to the oxidation type catalytic converter (4).
9. The tail gas treatment device of the gasoline engine test bench according to claim 1, wherein one end of the tail gas input pipe (1) is connected with the exhaust end of the engine through a flange, and a graphite sealing gasket is arranged between the flanges of the two.
10. The tail gas treatment device of a gasoline engine test bench according to claim 1, characterized in that the tail gas discharge pipe (5) is connected with a smoke exhaust pipe (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222795163.6U CN218325002U (en) | 2022-10-21 | 2022-10-21 | Tail gas treatment device of gasoline engine test bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222795163.6U CN218325002U (en) | 2022-10-21 | 2022-10-21 | Tail gas treatment device of gasoline engine test bed |
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| Publication Number | Publication Date |
|---|---|
| CN218325002U true CN218325002U (en) | 2023-01-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222795163.6U Active CN218325002U (en) | 2022-10-21 | 2022-10-21 | Tail gas treatment device of gasoline engine test bed |
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| CN (1) | CN218325002U (en) |
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- 2022-10-21 CN CN202222795163.6U patent/CN218325002U/en active Active
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