Tail gas purification device of diesel engine
By employing a dual-path treatment system involving a heat exchanger and an SCR catalyst layer in the diesel engine exhaust gas purification device, the problem of low efficiency of the exhaust gas purification device at high and low temperatures is solved, NOx removal efficiency is improved, diesel engine energy consumption and back pressure are reduced, and the service life of the diesel engine is extended.
Patent Information
- Application Number
- CN202520580561.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2035-03-31
AI Technical Summary
Existing diesel engine exhaust gas purification devices experience a decrease in purification efficiency under high or low temperature conditions, and lack real-time temperature regulation and dynamic monitoring, leading to catalyst activity damage or low reaction efficiency. Single-path exhaust gas treatment cannot fully utilize purification capacity, NOx removal efficiency is limited under high load conditions, and back pressure affects diesel engine performance and service life.
The system employs a diesel particulate filter and a selective catalytic reduction (SCR) system. Through a diesel engine exhaust purification device, initial temperature regulation is achieved via a heat exchanger, and the exhaust gas temperature is monitored in real time. The exhaust gas is then processed through a distributor and a selective catalyst layer in a dual-path manner, improving NOx removal efficiency and reducing back pressure.
It achieves appropriate regulation of exhaust gas temperature, improves the removal efficiency of particulate matter and nitrogen oxides, reduces the energy consumption and back pressure of diesel engines, extends the service life of diesel engines, and enhances the adaptability of the purification device.
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Figure CN223689799U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to diesel engine tail gas purification equipment technical field especially relates to a diesel engine tail gas purification device. BACKGROUND
[0002] With the wide application of diesel engines in the fields of industry, transportation and agricultural machinery, the problem of exhaust emission has attracted increasing attention. Diesel engine exhaust contains a large amount of particulate matter (PM) and nitrogen oxides (NOx) and other harmful substances. These pollutants not only cause serious pollution to the atmospheric environment, but also pose a threat to human health. In order to reduce the impact of exhaust emission on the environment, exhaust purification technology has developed rapidly. The exhaust purification device in the related technology mainly includes diesel particulate filter (DPF) and selective catalytic reduction (SCR) system, which is used to remove particulate matter and nitrogen oxides respectively. However, the exhaust gas usually does not undergo effective temperature regulation before entering the purification unit, resulting in a decrease in purification efficiency under high or low temperature conditions. High temperature may damage the catalyst activity, while low temperature may reduce the efficiency of catalytic reaction. Secondly, the existing device usually uses a single path to process exhaust gas, which is difficult to fully utilize the processing capacity of the purification unit, especially under high load conditions, the removal efficiency of NOx is limited. In addition, the existing exhaust purification device often has high back pressure during the emission process, which not only increases the energy consumption of the diesel engine, but also may affect its performance and service life. At the same time, the lack of real-time monitoring and dynamic adjustment mechanism makes it difficult for the purification device to adapt to the changes of exhaust temperature and flow, limiting the overall efficiency of the device. In view of this, it is necessary to improve the current exhaust purification device to solve the above problems.
[0003] The above information disclosed in the background section of this document only serves to understand the background of the present inventive concept, and therefore, it can contain information that does not constitute prior art. SUMMARY
[0004] The utility model discloses a diesel engine tail gas purification device to solve the tail gas purification device mainly includes diesel particulate filter (DPF) and selective catalytic reduction (SCR) system for removing particulate matter and nitrogen oxides respectively in the background art, however, tail gas usually does not pass through effective temperature regulation before entering the purification unit, leading to purification efficiency decline under high temperature or low temperature state, and high temperature can damage catalyst activity, and low temperature can reduce the efficiency of catalytic reaction. Secondly, the existing device adopts single path to process tail gas, and it is difficult to fully utilize the processing capacity of the purification unit, especially under high load working condition, the removal efficiency of NOx is limited. In addition, the existing tail gas purification device often has high back pressure during the discharging process, which not only increases the energy consumption of the diesel engine, but also can affect its performance and service life. At the same time, the lack of real-time monitoring and dynamic adjustment mechanism makes the purification device difficult to adapt to the change of tail gas temperature and flow, and limits the overall efficiency of the device.
[0005] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:
[0006] A diesel engine tail gas purification device, including diesel engine body and exhaust pipe, the diesel engine body upper end fixed connection exhaust pipe, the exhaust pipe one side fixed connection connecting pipe, the connecting pipe one side is equipped with flange, the annular pipeline passes through the fastening bolt connection connecting pipe's flange, the annular pipeline's inside is installed heat exchanger, the annular pipeline one side fixed connection tail gas processing cavity, the tail gas processing cavity's inside is installed diesel particulate filter, the tail gas processing cavity's middle installation is installed the partition, the diesel particulate filter one side is installed respectively first gas outlet and second gas outlet, first gas outlet and second gas outlet are located respectively partition's upper end and lower end.
[0007] As a preferred technical scheme, the upper end of the partition is provided with a first SCR catalyst layer, and the lower end of the partition is provided with a second SCR catalyst layer.
[0008] As a preferred technical scheme, the annular pipeline is provided with a temperature sensor inside.
[0009] As a preferred technical scheme, the tail gas processing cavity is provided with a first exhaust pipe and a second exhaust pipe on one side.
[0010] As a preferred technical scheme, the upper end of the diesel engine body is provided with a controller, and the controller is electrically connected with the temperature sensor.
[0011] The utility model discloses the beneficial effects are:
[0012] Through the device, the tail gas enters the connecting pipe from the diesel engine body through the exhaust cylinder, then realizes reliable connection with the annular pipeline through the flange and the fastening bolt, the heat exchanger inside the annular pipeline carries out preliminary temperature regulation on the tail gas, ensures that the temperature of the tail gas when entering the subsequent processing unit is in the appropriate range, thereby optimizing the purification effect, and the temperature sensor monitors the tail gas temperature in real time.
[0013] The diesel particulate filter effectively removes particulate matters in the tail gas, reduces emission pollution, the partition plate divides the tail gas into the first SCR catalyst layer and the second SCR catalyst layer for double-path processing, the removal efficiency of NOx is improved, and the double exhaust pipes enhance the smoothness of tail gas emission and reduce the influence of back pressure on the performance of the diesel engine. BRIEF DESCRIPTION OF DRAWINGS
[0014] Fig. 1 A structure diagram of the diesel engine tail gas purification device is provided in the utility model.
[0015] Fig. 2 A structure diagram of the diesel engine tail gas purification device is provided in the utility model.
[0016] In the drawing: 1, diesel engine body; 2, exhaust cylinder; 3, connecting pipe; 4, flange; 5, fastening bolt; 6, annular pipeline; 601, heat exchanger; 602, temperature sensor; 7, tail gas processing cavity; 8
[0017] Diesel particulate filter; 9, first gas outlet; 10, second gas outlet; 11, partition plate; 12, first SCR catalyst layer; 13, second SCR catalyst layer; 14, first exhaust pipe; 15, second exhaust pipe; 16, controller. DETAILED DESCRIPTION
[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.
[0019] In the description of the utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.
[0020] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an indicated number of technical features. Thus, features defined with "first", "second" or "third" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.
[0021] Referring to Figs. 1-2 A diesel engine exhaust purification device, comprising a diesel engine body 1 and an exhaust pipe 2, the upper end of the diesel engine body 1 is fixedly connected with the exhaust pipe 2, one side of the exhaust pipe 2 is fixedly connected with a connecting pipe 3, a flange 4 is installed on one side of the connecting pipe 3, a ring-shaped pipeline 6 is connected with the flange 4 of the connecting pipe 3 through a fastening bolt 5, a heat exchanger 601 is installed inside the ring-shaped pipeline 6, and a temperature sensor 602 is installed inside the ring-shaped pipeline 6.
[0022] Through the design, the exhaust gas enters the connecting pipe 3 from the diesel engine body 1 through the exhaust pipe 2, and then is reliably connected with the ring-shaped pipeline 6 through the flange 4 and the fastening bolt 5. The heat exchanger 601 inside the ring-shaped pipeline 6 performs preliminary temperature regulation on the exhaust gas, ensuring that the temperature of the exhaust gas entering the subsequent processing unit is within an appropriate range, thereby optimizing the purification effect. The temperature sensor 602 monitors the temperature of the exhaust gas in real time and transmits the data to the controller 16.
[0023] Among them, one side of the ring-shaped pipeline 6 is fixedly connected with an exhaust treatment cavity 7, a diesel particulate filter 8 is installed inside the exhaust treatment cavity 7, a partition plate 11 is installed in the middle of the exhaust treatment cavity 7, a first gas outlet 9 and a second gas outlet 10 are respectively installed on one side of the diesel particulate filter 8, the first gas outlet 9 and the second gas outlet 10 are respectively located at the upper end and the lower end of the partition plate 11, a first SCR catalyst layer 12 is installed on the upper end of the partition plate 11, a second SCR catalyst layer 13 is installed on the lower end of the partition plate 11, and a first exhaust pipe 14 and a second exhaust pipe 15 are respectively installed on one side of the exhaust treatment cavity 7.
[0024] Through the design, after the exhaust gas enters the exhaust treatment cavity 7 from the ring-shaped pipeline 6, it is first filtered by the diesel particulate filter 8 to remove particulate matter (PM). Subsequently, the filtered exhaust gas enters the upper and lower two independent areas separated by the partition plate 11 through the first gas outlet 9 and the second gas outlet 10, respectively. At the upper end of the partition plate 11, the exhaust gas undergoes a catalytic reduction reaction of nitrogen oxides (NOx) through the first SCR catalyst layer 12; at the lower end of the partition plate 11, the exhaust gas undergoes the same catalytic reduction treatment through the second SCR catalyst layer 13. Finally, the purified exhaust gas is discharged through the first exhaust pipe 14 and the second exhaust pipe 15, respectively.
[0025] The diesel particulate filter 8 effectively removes particulate matter (PM) in the exhaust gas, reducing emission pollution. The partition plate 11 divides the exhaust gas into two paths to the first SCR catalyst layer 12 and the second SCR catalyst layer 13 for double-path processing, improving the removal efficiency of NOx. The double exhaust pipe enhances the smoothness of exhaust gas emission, reducing the influence of back pressure on the performance of the diesel engine.
[0026] In other embodiments, the upper end of the diesel engine body 1 is provided with a controller 16, which is electrically connected with the temperature sensor 602.
[0027] Embodiment 1
[0028] When the diesel engine body 1 is running, the exhaust gas enters the connecting pipe 3 through the exhaust pipe 2. The exhaust gas flows into the annular pipe 6 through the connecting pipe 3, and the heat exchanger 601 adjusts the temperature of the exhaust gas. The temperature sensor 602 monitors the temperature of the exhaust gas and transmits the data to the controller 16. The controller 16 controls the heat exchanger 601 according to the temperature data to ensure that the temperature of the exhaust gas is appropriate. The adjusted exhaust gas enters the exhaust gas treatment cavity 7, and the particulate matter (PM) is removed by the diesel particulate filter 8. The filtered exhaust gas enters the upper end and lower end areas of the partition plate 11 through the first exhaust outlet 9 and the second exhaust outlet 10, respectively.
[0029] In the upper end, the exhaust gas is subjected to NOx catalytic reduction by the first SCR catalyst layer 12, and in the lower end, the exhaust gas is subjected to NOx catalytic reduction by the second SCR catalyst layer 13. The purified exhaust gas is discharged through the first exhaust pipe 14 and the second exhaust pipe 15, respectively.
[0030] In this embodiment, the exhaust gas from the diesel engine body 1 enters the connecting pipe 3 through the exhaust pipe 2, and then is reliably connected with the annular pipe 6 through the flange 4 and the fastening bolt 5. The heat exchanger 601 inside the annular pipe 6 preliminarily adjusts the temperature of the exhaust gas, ensuring that the temperature of the exhaust gas entering the subsequent processing unit is within an appropriate range, thereby optimizing the purification effect. The temperature sensor 602 monitors the temperature of the exhaust gas in real time.
[0031] The diesel particulate filter 8 effectively removes particulate matter (PM) in the exhaust gas, reducing emission pollution. The partition plate 11 divides the exhaust gas into two paths to the first SCR catalyst layer 12 and the second SCR catalyst layer 13 for double-path processing, improving the removal efficiency of NOx. The double exhaust pipe enhances the smoothness of exhaust gas emission, reducing the influence of back pressure on the performance of the diesel engine.
[0032] The above description is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can make equivalent substitutions or changes within the technical scope disclosed by the present application according to the technical scheme and concept of the present application, which should be covered within the protection scope of the present application.
Claims
1. An exhaust gas purifying apparatus for a diesel engine, comprising a diesel engine body (1) and an exhaust pipe (2), characterized by, The diesel engine body (1) is fixedly connected with an exhaust pipe (2) at the upper end, one side of the exhaust pipe (2) is fixedly connected with a connecting pipe (3), a flange (4) is mounted on one side of the connecting pipe (3), a ring-shaped pipeline (6) is connected with the flange (4) of the connecting pipe (3) through a fastening bolt (5), a heat exchanger (601) is mounted in the ring-shaped pipeline (6), an exhaust treatment cavity (7) is fixedly connected with one side of the ring-shaped pipeline (6), a diesel particulate filter (8) is mounted in the exhaust treatment cavity (7), a partition plate (11) is mounted in the middle of the exhaust treatment cavity (7), a first gas outlet (9) and a second gas outlet (10) are respectively mounted on one side of the diesel particulate filter (8), and the first gas outlet (9) and the second gas outlet (10) are respectively located at the upper end and the lower end of the partition plate (11).
2. A diesel exhaust gas purification device according to claim 1, characterized by A first SCR catalyst layer (12) is mounted on the upper end of the partition plate (11), and a second SCR catalyst layer (13) is mounted on the lower end of the partition plate (11).
3. The diesel exhaust gas purification device according to claim 1, wherein A temperature sensor (602) is mounted in the ring-shaped pipeline (6).
4. The diesel exhaust gas purification device according to claim 1, wherein A first exhaust pipe (14) and a second exhaust pipe (15) are respectively mounted on one side of the exhaust treatment cavity (7).
5. The diesel exhaust gas purification device according to claim 1, wherein A controller (16) is mounted on the upper end of the diesel engine body (1), and the controller (16) is electrically connected with the temperature sensor (602).