CN210637139U

CN210637139U - Regeneration purification device of diesel engine tail gas particle catcher

Info

Publication number: CN210637139U
Application number: CN201921689227.6U
Authority: CN
Inventors: 孙威; 沈国泉
Original assignee: Zhejiang Mobile Hydraulic Power Technology Co ltd
Current assignee: Zhejiang Mobile Hydraulic Power Technology Co ltd
Priority date: 2019-10-10
Filing date: 2019-10-10
Publication date: 2020-05-29
Anticipated expiration: 2029-10-10

Abstract

The utility model provides a regeneration purification device of a diesel engine exhaust particle catcher, which comprises a shell, wherein the inlet and the outlet of the shell are respectively provided with a pressure sensor; electric heaters are arranged in the shell at intervals, a silicon carbide layer or a cordierite honeycomb ceramic layer is filled between the electric heaters, and the central axes of the electric heaters, the silicon carbide layer and the cordierite honeycomb ceramic layer are superposed; the silicon carbide layer and the cordierite honeycomb ceramic layer are respectively provided with a temperature sensor, and the temperature sensor and the electric heater are respectively connected with an external power supply and an electronic control unit through leads. The utility model has the advantages that: the structure design is reasonable, the electric heater is arranged between the porous media in the middle of the shell, so that the particles in the DPF can be uniformly heated and can be fully combusted; the temperature sensor can control the temperature of the electric heater, so that the problem of overheating or insufficient combustion during heating is avoided, and the uniform heating is further ensured.

Description

Regeneration purification device of diesel engine tail gas particle catcher

Technical Field

The utility model relates to a diesel engine tail gas administers technical field, concretely relates to diesel engine tail gas particle trap's regeneration purifier.

Background

With the development of science and technology and economy, the exhaust emission standard of diesel engines becomes more and more strict, and in order to meet the low emission requirement of diesel engines, the method mainly adopted at present is to add an Oxidation catalyst doc (diesel Oxidation catalyst) and a Particulate filter dpf (diesel Particulate filter) in the exhaust aftertreatment system of the diesel engines.

In a diesel engine post-treatment system, tail gas of a diesel engine firstly enters an oxidation catalyst, hydrocarbon and carbon monoxide in the tail gas react with residual oxygen in the tail gas to generate carbon dioxide and water, partial heat is released to promote the temperature of the tail gas to rise, then the tail gas enters a particle collector DPF, and particles in the tail gas are captured and collected in the DPF through a series of diffusion, interception, inertial collision and gravity deposition, so that low emission is realized. However, particulates trapped in the DPF can gradually clog the DPF, resulting in increased exhaust backpressure in the aftertreatment system, insufficient vehicle power, increased fuel consumption, and degraded emissions results.

In order to prevent clogging, the trapped particulate matter needs to be actively heated, and when the temperature rises to 600 ℃, the particulate matter adsorbed inside the porous medium of the DPF undergoes oxidation reaction under the action of the catalyst and burns to generate carbon dioxide and water, and simultaneously emits heat. This oxidation process is also called regeneration cleaning of the DPF.

At present, two regeneration heating methods are commonly used, one is heating by injecting oil near a tail gas inlet at the front end of the DPF for ignition, and the other is preheating tail gas entering the DPF by an electric heating method. Both heating methods use the heated exhaust gas to transfer heat to the particulates in the DPF, burning the particulates above 600 ℃. The first method has the disadvantages of complex oil injection control, inaccurate temperature control, easy overheating or insufficient combustion and the like; in the latter method, the particles to be burned cannot be directly heated by an indirect heating method, so that the heating efficiency is low, the required heating power is high, the automatic regeneration of the engine in normal work is not facilitated, and the electric heating regeneration is realized by a special external power supply.

Disclosure of Invention

The purpose of the utility model is to provide a

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:

a regeneration purification device of a diesel engine exhaust particle catcher comprises a shell, wherein an inlet and an outlet of the shell are respectively provided with a pressure sensor; electric heaters are arranged in the shell at intervals, a silicon carbide layer or a cordierite honeycomb ceramic layer is filled between the electric heaters, and the central axes of the electric heaters, the silicon carbide layer and the cordierite honeycomb ceramic layer are superposed; the silicon carbide layer and the cordierite honeycomb ceramic layer are respectively provided with a temperature sensor, and the temperature sensor and the electric heater are respectively connected with an external power supply and an electronic control unit through leads.

Further, the power of the electric heater is decreased from the inlet to the outlet.

Further, the electric heater includes a porous housing and a heating wire within the housing.

Furthermore, aluminum silicate sheets are arranged between the silicon carbide layer and the electric heater and between the cordierite honeycomb ceramic layer and the electric heater.

Compared with the prior art, the utility model, have following advantage:

the utility model relates to a regeneration purification device of a diesel engine exhaust particle catcher, which has reasonable structural design, and an electric heater is arranged between porous media in the middle of a shell, so that particles in a DPF can be uniformly heated and can be fully combusted; the temperature sensor can control the temperature of the electric heater, so that the problem of overheating or insufficient combustion during heating is avoided, and the uniform heating is further ensured.

Drawings

Fig. 1 is a schematic structural diagram of a regeneration and purification device of a diesel engine exhaust particulate filter of the present invention.

Detailed Description

Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

As shown in figure 1, the regeneration purification device of the diesel engine exhaust particle catcher comprises a shell 1, wherein a first pressure sensor 2 and a second pressure sensor 14 are respectively arranged at an inlet and an outlet of the shell 1, the pressure sensors are used for detecting the pressure in the shell 1, and the particles in the DPF generate pressure difference, and when the pressure sensors detect larger pressure difference, the blockage degree of the particles in the shell 1 is serious. The electric heaters are arranged in the shell 1 at intervals, the silicon carbide layer or the cordierite honeycomb ceramic layer is filled between the electric heaters, the central axes of the electric heaters, the silicon carbide layer and the cordierite honeycomb ceramic layer are superposed, and the silicon carbide layer and the cordierite honeycomb ceramic layer have the function of adsorbing particles as porous media. Specifically, the inner cavity of the shell 1 is cylindrical, four circular electric heaters are arranged in the middle of the shell 1, each electric heater comprises a porous circular shell and heating wires in the circular shell, a first electric heater 3, a second electric heater 4, a third electric heater 5 and a fourth electric heater 6 are arranged from the inlet to the outlet of the shell 1 respectively, a front silicon carbide layer 7 is filled between the first electric heater 3 and the second electric heater 4, a cordierite honeycomb ceramic layer 8 is filled between the second electric heater 4 and the third electric heater 5, and a rear silicon carbide layer 9 is filled between the third electric heater 5 and the fourth electric heater 6. The front silicon carbide layer 7, the cordierite honeycomb ceramic layer 8 and the rear silicon carbide layer 9 are respectively provided with a first temperature sensor 10, a second temperature sensor 11 and a third temperature sensor 12, the temperatures of the front silicon carbide layer 7, the cordierite honeycomb ceramic layer 8 and the rear silicon carbide layer 9 can be respectively detected, and the output powers of the four electric heaters are controlled according to the detected temperatures, so that the internal temperature of the DPF can be controlled in a closed loop mode. Furthermore, according to the temperature detection of the three temperature sensors, the temperature gradient change of the combustion reaction in the DPF is analyzed in detail, the heat required by the compensation of the four electric heaters is actively controlled, and the regeneration of the whole DPF is in the optimal working state. The temperature sensor and the electric heater are respectively connected with an external power supply and an electronic control unit through leads, and the outer sides of the leads are sealed by rubber sealing rings.

The power of the four electric heaters is different, and the power of the four electric heaters decreases from the inlet to the outlet of the shell 1. Since the distribution of the particulates in the DPF is more front and less rear, the particulates accumulated in the front silicon carbide layer 7 is the most, and the heat released after the combustion of these particulates can be heated by the combustion of the rear particulates.

Aluminum silicate sheets 13 can be arranged between the silicon carbide layer and the electric heater and between the cordierite honeycomb ceramic layer and the electric heater, and the aluminum silicate sheets 13 have the functions of connection and sealing.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the concept of the present invention, and these improvements and decorations should also be considered as the protection scope of the present invention.

Claims

1. The utility model provides a diesel engine exhaust particulate trap's regeneration purifier, includes the shell, its characterized in that: the inlet and the outlet of the shell are respectively provided with a pressure sensor; electric heaters are arranged in the shell at intervals, a silicon carbide layer or a cordierite honeycomb ceramic layer is filled between the electric heaters, and the central axes of the electric heaters, the silicon carbide layer and the cordierite honeycomb ceramic layer are superposed; the silicon carbide layer and the cordierite honeycomb ceramic layer are respectively provided with a temperature sensor, and the temperature sensor and the electric heater are respectively connected with an external power supply and an electronic control unit through leads.

2. The regeneration and purification device for the diesel engine exhaust particulate filter according to claim 1, wherein: the power of the electric heater is decreased from the inlet to the outlet.

3. The regeneration purification device of the diesel engine exhaust particulate trap according to claim 1 or 2, characterized in that: the electric heater includes a porous housing and a heating wire within the housing.

4. The regeneration and purification device for the diesel engine exhaust particulate filter according to claim 1, wherein: aluminum silicate sheets are arranged between the silicon carbide layer and the electric heater and between the cordierite honeycomb ceramic layer and the electric heater.