Regeneration thermal runaway detection system for catalytic diesel particulate filter

Abstract

The utility model discloses a regeneration thermal runaway detection system for a catalytic diesel particulate filter, which relates to the technical field of diesel exhaust particulate treatment research and comprises a temperature imaging mechanism and a data acquisition unit. The infrared thermal imaging thermodetector can measure the temperature of the inlet channel area of the particle trap through the transparent glass sheet and convert the temperature into a visual thermal image; the data collector is used for being electrically connected with the infrared thermal imaging thermodetector so as to receive a thermal image transmitted by the infrared thermal imaging thermodetector and can conduct data analysis on temperature distribution on the thermal image so as to judge whether the local temperature of an inlet channel area of the particle trap exceeds the temperature enabling a carrier of the particle trap to be damaged or not. The device is convenient to use, can timely find the high-temperature condition of thermal runaway caused by possible overhigh local temperature, and effectively prevents the particle trap carrier from being damaged.

Description

TECHNICAL FIELD

[0001] The utility model relates to diesel engine tail gas particulate matter treatment research technical field, especially to a kind of catalytic diesel particulate filter regeneration thermal runaway detection system. BACKGROUND

[0002] Diesel engine is favored by people due to its high reliability, high thermal efficiency, strong power and good fuel economy.Catalytic diesel particulate filter (CDPF) is an important device for controlling diesel particulate emissions, and its particulate filtration efficiency can usually reach more than 95%.When particulate matter is deposited too much, the particulate filter needs to be regenerated to remove the particulate matter, to reduce the exhaust back pressure of the diesel engine and ensure the normal operation of the engine.

[0003] CDPF needs electric heating or fuel injection strategy to increase the inlet temperature of CDPF, and is coated with a catalyst to assist the regeneration of particulate matter.However, this can cause the local temperature of the CDPF inlet passage to be too high, causing damage to the CDPF carrier and reducing its performance, which will cause environmental pollution.

[0004] In the prior art, a Chinese patent with authorization announcement number CN107956543B detects the working performance of diesel particulate filter (DPF) by installing temperature and pressure difference sensors at the inlet and outlet of diesel particulate filter (DPF).This method cannot accurately display the internal temperature of diesel particulate filter (DPF), cannot detect the change of local temperature in the passage of diesel particulate filter (DPF), and the accuracy of estimating the change of particulate matter in diesel particulate filter (DPF) by pressure difference sensor is low.

[0005] Therefore, it is necessary to design a catalytic diesel particulate filter regeneration thermal runaway detection system to monitor the change of regeneration temperature of the particulate filter in real time and avoid the occurrence of local temperature too high in the particulate filter. UTILITY MODEL CONTENT

[0006] The utility model aims to provide a kind of catalytic diesel particulate filter regeneration thermal runaway detection system to solve the problems existing in the prior art, simple structure, convenient to use, can find high temperature condition that possibly local temperature is too high and leads to thermal runaway in time, effectively prevent the damage of particulate filter carrier.

[0007] To achieve the above-mentioned purpose, the utility model provides the following scheme:

[0008] The utility model provides a kind of catalytic diesel particulate filter regeneration thermal runaway detection system, including diesel engine, particulate trap and diesel engine control system, the diesel engine with the diesel engine control system electric connection, the diesel engine is communicated with the inlet channel of the particulate trap by intake elbow;Its characterized in that: including: temperature imaging mechanism and data collector, the temperature imaging mechanism includes infrared thermal imaging temperature detector and transparent glass sheet, the arc outer convex surface of the intake elbow is equipped with window, the transparent glass sheet is sealed installation in the window of the intake elbow, the infrared acquisition end of the infrared thermal imaging temperature detector is measured and converted into visual thermal image to the temperature of the inlet channel area of the particulate trap by the transparent glass sheet, the data collector is used to with the image output end electric signal connection of the infrared thermal imaging temperature detector to receive the thermal image transmitted by the infrared thermal imaging temperature detector and show the temperature distribution of the inlet channel area of the particulate trap.

[0009] Preferably, the window is arranged along the tangent of the arc outer convex surface of the intake elbow.

[0010] Preferably, the axis of the infrared acquisition end of the infrared thermal imaging temperature detector is arranged in line with the axis of the inlet channel of the particulate trap, and the infrared acquisition end of the infrared thermal imaging temperature detector is arranged at an angle of 45 degrees to the transparent glass sheet through the center of the transparent glass sheet.

[0011] Preferably, the transparent glass sheet is inlaid and fixedly connected to the inner wall of the window.

[0012] Preferably, the online particulate analysis mechanism further includes a particle size and concentration monitor, a first collection pipeline and a second collection pipeline. The particle size and concentration monitor is connected to the inlet channel of the particulate trap through the first collection pipeline to measure the particle size and concentration of particulate matter at the inlet channel of the particulate trap, and is connected to the outlet channel of the particulate trap through the second collection pipeline to measure the particle size and concentration of particulate matter at the outlet channel of the particulate trap.

[0013] Preferably, the online particulate analysis mechanism further includes a first flow control valve and a second flow control valve. The first flow control valve is arranged in the first collection pipeline, and the second flow control valve is arranged in the second collection pipeline.

[0014] Preferably, the online particulate analysis mechanism further includes a first heat preservation member and a second heat preservation member. The first heat preservation member is arranged in the first collection pipeline, and the second heat preservation member is arranged in the second collection pipeline.

[0015] Preferably, the first heat preservation member is a first heat preservation belt, the first heat preservation belt is wrapped around the periphery of the first collecting pipeline, the second heat preservation member is a second heat preservation belt, and the second heat preservation belt is wrapped around the periphery of the second collecting pipeline.

[0016] The utility model discloses relative to prior art has obtained following technical effect:

[0017] 1. The utility model provides a catalytic diesel particulate filter regeneration thermal runaway detection system, through the cooperation of temperature imaging mechanism and data collector, can real -time monitoring the temperature of particle trap import passage area, in time discovers the high temperature condition of possible local temperature too high leads to thermal runaway, effectively prevents the carrier damage of particle trap,

[0018] 2. Set up online particle analysis mechanism auxiliary judgment particle trap's working state, and online particle analysis mechanism is through the measurement and analysis of import passage and export passage particulate matter particle size and concentration, combines temperature measurement result, judges more accurately whether the thermal runaway phenomenon occurs. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will briefly introduce the drawing needed in the embodiment, obviously, the drawing in the following description only is some embodiments of the utility model, for ordinary skilled person in the art, under the premise of not paying creative labor, still can obtain other drawings according to these drawings.

[0020] Figure 1 The structure schematic diagram of catalytic diesel particulate filter regeneration thermal runaway detection system provided by the utility model is used.

[0021] In the drawing: 1, temperature imaging mechanism;11, infrared thermal imaging temperature measuring instrument;12, transparent glass sheet;21, first collecting pipeline;22, second collecting pipeline;23, online particle analyzer;24, first flow control valve;25, second flow control valve;26, first heat preservation member;27, second heat preservation member;3, data collector;41, diesel engine;42, diesel engine control system;43, intake elbow;44, particle trap. DETAILED DESCRIPTION

[0022] The technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model, obviously, the described embodiment only is a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by ordinary skilled person in the art without making creative labor belong to the range of protection of the utility model.

[0023] The utility model discloses a catalytic diesel particulate filter 44 regeneration thermal runaway detection system, including diesel engine 41, particulate trap 44 and diesel engine control system 42, diesel engine 41 is connected with diesel engine control system 42 electricity, and diesel engine 41 is connected with the import passage of particulate trap 44 through intake elbow pipe 43, its characterized in that: including: temperature imaging mechanism 1 and data collector 3, temperature imaging mechanism 1 includes infrared thermal imaging temperature detector 11 and transparent glass sheet 12, the arc outer convex surface of intake elbow pipe 43 is equipped with window, and transparent glass sheet 12 is sealedly installed at the window of intake elbow pipe 43, and the infrared collection end of infrared thermal imaging temperature detector 11 passes through transparent glass sheet 12 and measures the temperature of the import passage area of particulate trap 44 and converts into visual heat image, and data collector 3 is used for with infrared thermal imaging temperature detector 11's image output end electric signal connection to receive the heat image of infrared thermal imaging temperature detector 11 transmission and show the temperature distribution of the import passage area of particulate trap 44, through the cooperation of temperature imaging mechanism 1 and data collector 3, can form the visual heat image of the import passage area of particulate trap 44, can real-time monitoring the temperature of the import passage area of particulate trap 44, and through visual heat image can intuitively understand temperature distribution and discover the high temperature condition that possibly leads to thermal runaway in time, effectively prevent the carrier damage of particulate trap 44.

[0024] In order to make the above-mentioned purpose, features and advantages of the utility model more apparent and easy to understand, the utility model will be further explained in detail below in combination with the drawings and specific embodiments.

[0025] Embodiment one

[0026] The utility model provides a catalytic diesel particulate filter 44 regeneration thermal runaway detection system, including diesel engine 41, particulate trap 44 and diesel engine control system 42, diesel engine 41 is connected with diesel engine control system 42 electricity, and diesel engine 41 is connected with the import passage of particulate trap 44 through intake elbow pipe 43, its characterized in that: including: temperature imaging mechanism 1 and data collector 3, temperature imaging mechanism 1 includes infrared thermal imaging temperature detector 11 and transparent glass sheet 12, the arc outer convex surface of intake elbow pipe 43 is equipped with window, and transparent glass sheet 12 is sealedly installed at the window of intake elbow pipe 43, and the infrared collection end of infrared thermal imaging temperature detector 11 passes through transparent glass sheet 12 and measures the temperature of the import passage area of particulate trap 44 and converts into visual heat image, and data collector 3 is used for with infrared thermal imaging temperature detector 11's image output end electric signal connection to receive the heat image of infrared thermal imaging temperature detector 11 transmission and show the temperature distribution of the import passage area of particulate trap 44, through the cooperation of temperature imaging mechanism 1 and data collector 3, can form the visual heat image of the import passage area of particulate trap 44, can real-time monitoring the temperature of the import passage area of particulate trap 44, and through visual heat image can intuitively understand temperature distribution and discover the high temperature condition that possibly leads to thermal runaway in time, effectively prevent the carrier damage of particulate trap 44.

[0027] In a preferred embodiment of the present embodiment, the window is arranged along the tangent of the arc outer convex surface of the intake elbow pipe 43, making the installation of the transparent glass sheet 12 more reasonable and reducing the interference with the airflow in the intake elbow pipe 43, while also providing a better observation angle for the infrared thermal imaging temperature detector 11.

[0028] In a preferred scheme of the embodiment, the axis of the infrared collection end of the infrared thermal imaging thermometer 11 is arranged in line with the axis of the inlet channel of the particulate trap 44, and the infrared collection end of the infrared thermal imaging thermometer 11 is arranged through the center of the transparent glass sheet 12 at an angle of 45 degrees with the transparent glass sheet 12. The in-line arrangement and the specific angle ensure that the thermometer can accurately aim at the key area of the inlet channel of the particulate trap 44, improve the accuracy of temperature measurement, and avoid temperature errors caused by deviation of the measurement angle.

[0029] In a preferred scheme of the embodiment, the transparent glass sheet 12 is inlaid and sealedly fixedly connected to the inner wall of the window. The inlaid and sealedly fixedly connected arrangement ensures the sealing of the gas inlet elbow 43, prevents gas leakage, and ensures the stability of the transparent glass sheet 12, so that the infrared thermal imaging thermometer 11 can stably measure the temperature for a long time.

[0030] In a preferred scheme of the embodiment, the temperature measurement range of the infrared thermal imaging thermometer 11 is 0-1500℃, and the resolution of the thermal image converted by the infrared thermal imaging thermometer 11 into a visual image is 640x512. The wide temperature measurement range can adapt to the temperature changes of the inlet channel area of the particulate trap 44 under different working conditions, and the high-resolution thermal image helps to more clearly observe the temperature distribution, which provides strong support for accurately judging the thermal runaway.

[0031] In a preferred scheme of the embodiment, the catalytic diesel particulate trap 44 regeneration thermal runaway detection system further comprises an online particle analysis mechanism. The online particle analysis mechanism comprises a particle size and concentration monitor, a first collection pipeline 21 and a second collection pipeline 22. The particle size and concentration monitor is connected to the inlet channel of the particulate trap 44 through the first collection pipeline 21 to measure the particle size and concentration of the particulate matter at the inlet channel of the particulate trap 44, and is connected to the outlet channel of the particulate trap 44 through the second collection pipeline 22 to measure the particle size and concentration of the particulate matter at the outlet channel of the particulate trap 44. The first collection pipeline 21 and the second collection pipeline 22 have a pipe diameter of 1.5 cm and are respectively connected to the inlet and outlet of the catalytic diesel particulate trap 44 at a distance of 5 cm. The collection pipelines arranged at the inlet and outlet channels enable the online particle analyzer 23 to accurately measure the particle size and concentration of the particulate matter at the inlet and outlet, which provides more comprehensive data support for judging the thermal runaway.

[0032] In a preferred scheme of the embodiment, the online particle analysis mechanism further comprises a first flow control valve 24 and a second flow control valve 25, the first flow control valve 24 is arranged in the first collection pipeline 21 and can control the flow of the first collection pipeline 21 to be no more than 5 L / min, the second flow control valve 25 is arranged in the second collection pipeline 22 and can control the flow of the second collection pipeline 22 to be no more than 5 L / min, the arrangement of the flow control valve can control the flow of the collection pipeline, ensure that the online particle analyzer 23 measures in a suitable flow range, and improve the accuracy and stability of the measurement.

[0033] In a preferred scheme of the embodiment, the online particle analysis mechanism further comprises a first heat preservation member 26 and a second heat preservation member 27, the first heat preservation member 26 is arranged in the first collection pipeline 21, the heat preservation range of the first heat preservation member 26 is 0-100℃, the second heat preservation member 27 is arranged in the second collection pipeline 22, the heat preservation range of the second heat preservation member 27 is 0-100℃, the arrangement of the heat preservation member can prevent the temperature of the gas in the collection pipeline from changing too much, ensure that the online particle analyzer 23 measures in a relatively stable temperature environment, and improve the reliability of the measurement result.

[0034] In a preferred scheme of the embodiment, the first heat preservation member is a first heat preservation belt, the first heat preservation belt is wrapped around the periphery of the first collection pipeline, the second heat preservation member is a second heat preservation belt, and the second heat preservation belt is wrapped around the periphery of the second collection pipeline, the use of the heat preservation belt to wrap the collection pipeline throughout can effectively reduce the heat loss of the gas in the collection pipeline, ensure that the online particle analysis mechanism measures in a relatively stable temperature environment, and improve the accuracy and stability of the measurement result. At the same time, the use of the heat preservation belt facilitates installation and disassembly, and is convenient for maintenance and replacement.

[0035] In a preferred scheme of the embodiment, the particle size measurement range of the online particle analyzer 23 is 10-300 nm, and the concentration measurement range is 1E3-3E8 N / cm3, which can meet the measurement requirements of the particulate matter in the inlet and outlet channels of the particle trap 44, and provide accurate particulate matter parameters for judging thermal runaway.

[0036] In a preferred scheme of the embodiment, the data collector 3 is a data collection computer.

[0037] Embodiment two

[0038] The utility model provides a kind of catalytic diesel engine, including, diesel engine 41, diesel engine control system 42, particulate trap 44, intake elbow 43 and as embodiment one catalytic diesel engine particulate trap regeneration thermal runaway detection system, intake elbow 43 is 90 degree elbow, the transparent glass side sealing inlay of catalytic diesel engine particulate trap regeneration thermal runaway detection system is with the outside of 90 degree elbow elbowing, intake elbow 43 is used to connect diesel engine 41 and particulate trap 44, diesel engine 41 is electrically connected with diesel engine control system 42, diesel engine control system 42 controls the working condition condition of diesel engine 41 in the regeneration of particulate trap 44, catalytic diesel engine particulate trap regeneration thermal runaway detection system is integrated into catalytic diesel engine, can monitor the thermal runaway condition of particulate trap 44 in regeneration process in real time, guarantee the normal operation of diesel engine and the service life of particulate trap 44. The design of 90 degree elbow and the installation position of transparent glass sheet 12 facilitate temperature measurement by infrared thermal imaging temperature measuring instrument 11, diesel engine control system 42 can accurately control diesel engine to be in suitable working condition, improve the reliability and stability of entire system.

[0039] Example three

[0040] The specific implementation steps of the catalytic diesel engine particulate trap regeneration thermal runaway detection system provided by the utility model are as follows:

[0041] Before starting engine, open infrared thermal imaging temperature measuring instrument 11 and online particle analyzer 23, adjust first flow control valve 24 and second flow control valve 25 to make the flow of first collection pipeline 21 and second collection pipeline 22 less than 5L / min, and set the temperature of first heat preservation piece 26 and second heat preservation piece 27 to 100 DEG C. Start diesel engine 41, control diesel engine to reach catalytic diesel engine particulate trap regeneration condition through diesel engine control system 42, and finally detect the temperature of diesel engine particulate trap inlet passage area, the change of import and export particulate matter particle size and concentration through data acquisition computer.

[0042] The principle and implementation mode of the utility model are described by applying specific examples in the utility model, and the above embodiment is only used to help understand the method and core idea of the utility model; meanwhile, for general skilled person in the art, according to the idea of the utility model, there will be changes in specific implementation mode and application range. In conclusion, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A catalytic converter-type diesel engine particulate filter regeneration thermal runaway detection system, comprising a diesel engine (41), a particulate filter (44), and a diesel engine control system (42), wherein the diesel engine (41) is electrically connected to the diesel engine control system (42), and the diesel engine (41) is connected to the inlet channel of the particulate filter (44) via an intake bend (43); characterized in that: include: A temperature imaging mechanism (1) includes an infrared thermal imaging thermometer (11) and a transparent glass plate (12). The inlet bend (43) has a window on its arc-shaped convex surface. The transparent glass plate (12) is sealed and installed at the window of the inlet bend (43). The infrared acquisition end of the infrared thermal imaging thermometer (11) measures the temperature of the inlet channel area of ​​the particle trap through the transparent glass plate (12) and converts it into a visualized thermal image. The data acquisition unit (3) is used to connect to the image output terminal of the infrared thermal imaging thermometer (11) to receive the thermal image transmitted by the infrared thermal imaging thermometer (11) and display the temperature distribution in the inlet channel area of ​​the particle trap.

2. The catalytic converter particulate filter regeneration thermal runaway detection system according to claim 1, characterized in that: The window is arranged along the tangent of the arc-shaped convex surface parallel to the intake bend (43).

3. The catalytic converter particulate filter regeneration thermal runaway detection system according to claim 2, characterized in that: The centerline of the infrared acquisition end of the infrared thermal imaging thermometer (11) is collinear with the centerline of the inlet channel of the particle trap (44), and the infrared acquisition end of the infrared thermal imaging thermometer (11) passes through the center of the transparent glass plate (12) and is set at a 45-degree angle with the transparent glass plate (12).

4. The catalytic converter particulate filter regeneration thermal runaway detection system according to claim 2, characterized in that: The transparent glass sheet (12) is inlaid, sealed, and fixedly connected to the inner wall of the window.

5. The catalytic converter particulate filter regeneration thermal runaway detection system according to any one of claims 1 to 4, characterized in that: It also includes an online particle analysis unit, which includes a particle size and concentration monitor (23), a first collection pipe (21), and a second collection pipe (22). The particle size and concentration monitor (23) is connected to the inlet channel of the particle trap through the first collection pipe (21) to measure the particle size and concentration at the inlet channel of the particle trap. It is connected to the outlet channel of the particle trap through the second collection pipe (22) to measure the particle size and concentration at the outlet channel of the particle trap.

6. The catalytic converter particulate filter regeneration thermal runaway detection system according to claim 5, characterized in that: The online particle analysis unit also includes a first flow control valve (24) and a second flow control valve (25), wherein the first flow control valve (24) is disposed in the first collection pipe (21) and the second flow control valve (25).

7. The catalytic converter particulate filter regeneration thermal runaway detection system according to claim 6, characterized in that: The online particle analysis unit also includes a first insulation component (26) and a second insulation component (27), wherein the first insulation component (26) is disposed on the first collection pipe (21) and the second insulation component (27) is disposed on the second collection pipe (22).

8. The catalytic converter particulate filter regeneration thermal runaway detection system according to claim 7, characterized in that: The first insulation component (26) is a first insulation strip, which wraps around the periphery of the first collection pipe (21) along its entire length. The second insulation component (27) is a second insulation strip, which wraps around the periphery of the second collection pipe (22) along its entire length.

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