Electrothermic type diesel engine exhaust gas grain catcher

Abstract

The invention provides an electrothermic type diesel engine exhaust gas grain catcher, which comprises a conductive central tube, corrugated sheet filter elements, hold-down strips, flat plate filter elements, insulating coatings, a conductive metal strip, an outer ring insulating layer and a metal shell. The flat plate filter elements with the same width are superposed on a lower layer of the corrugated sheet filter elements to form a filter element, the head end of the filter element is flat and level, and is superposed and welded with a bus of the conductive central tube; the tail end of the filter element is closely welded together with the conductive metal strip; two hold-down strips coated with the insulating coatings are welded on straight edges of two ends of the corrugated sheet filter elements respectively; the filter element is wound into a cylindrical filter element by taking the conductive central tube as an axis, and outer layer of the filter element is bound up with the outer ring insulating layer and then is placed in the metal shell; and the height of the hold-down strips is the same as that of the wave crests of the corrugated sheet filter elements. The electrothermic type diesel engine exhaust gas grain catcher integrates the functions of filtering and heating, and has the characteristics of high filtration rate, low exhaust back pressure, direct and overall energization and heating, small power consumption, short regeneration time and simple and reliable control.

Description

technical field [0001] The invention relates to the technical field of post-treatment of engine exhaust gas, in particular to a metal fiber filter mat wall-flow diesel engine exhaust particle collector which can be heated by electricity and has an active regeneration function. Background technique [0002] At present, diesel engines widely used in automobiles, construction machinery, agricultural machinery, train traction locomotives and ships emit a large amount of particulate matter during work, which not only causes serious harm to human health, but also causes serious pollution to the environment. To this end, the industry has invested a lot of manpower and material resources to research various ways of engine particulate matter after-treatment technologies and products, which have made a huge contribution to the improvement of engine emission levels. Summarize the existing engine particulate matter post-treatment technologies and products, which can be divided into two ...

AI Technical Summary

Problems solved by technology

[0004] 1) The wall-flow ceramic filter has high filtration efficiency and good high temperature resistance, but has poor air permeability, large fluid pressure drop, poor mechanical vibration resistance, and poor thermal shock resistance. It is easy to block when working without regeneration conditions. Once the channel is blocked , the exhaust back pressure is very high, which affects the continuous operation of the engine and requires manual offline cleaning

[0005] 2) The wall-flow metal fiber filter has high filtration efficiency, good air permeability, small fluid pressure drop, strong resistance to mechanical vibration, and good thermal shock resistance, but poor high temperature resistance, and it will block when working without regeneration conditions. Once the hole is blocked, the exhaust back pressure is very high, which will affect the continuous operation of the engine and require manual off-line cleaning or high-temperature controlled regeneration

[0006] 3) Other types of metal fiber filters, such as bag, tube or pleated filters, have high filtration efficiency, good air permeability, small fluid pressure drop, strong resistance to mechanical vibration, and good thermal shock resistance, but Poor high temperature resistance, although it is not easy to clog when working without regeneration conditions, but too thick carbon deposits will also cause high exhaust back pressure, which will affect the continued operation of the engine

This type of filter has obvious advantages in preventing filter clogging, but there are also shortcomings, such as low filtration efficiency, and the emission of particulate matter after the general engine is installed has improved, but it cannot meet the requirements of high standard emission levels

It has the characteristics of good filtration performance and low power consumption, but the regeneration time is longer and the control is more complicated

In addition, the series / parallel structure of the metal fiber filter felt folding filter and the overall energized heating regeneration technology have the advantages of short unit regeneration time, but the filter area per unit volume is small, the system volume is large, the number of filter units is large, and the regeneration load ratio high

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