LPG heating back blowing regenerative diesel engine particulate trap device

Abstract

The application provides an LPG heating back blowing regenerative diesel engine soot (particulate) trap system suitable for city buses. The system is composed of two parts, a soot trap part and a soot heating regenerating part. The filter element of the trap device is made by coiling high density wire mesh; a bypass system is designed, when blocking occurs accidentally, a bypass valve automatically opens, and tail gas is directly discharged via a bypass pipe. After travelling of a bus for the day is ended, liquefied petroleum gas (LPG) is utilized as the heating source to be mixed and combusted with the air blown in by an air blower and then flow into the trap device; the temperature of the fuel gas blown back into the soot trap device is as high as 800 DEG C, and the soot trapped on the filter element is ignited quickly. When the overall temperature of the filter element reaches a certain set value, an electronic control unit is used for controlling and increasing the air flow of a secondary air blower to provide an oxygen-rich environment to boost quicker combustion and regeneration, at the moment, the LPG heating source is automatically cut off, and regeneration can be continued by just blowing in secondary air, thus saving energy.

Description

1. Technical field [0001] This application proposes a set of tail gas purification device (DPF) suitable for urban buses, which can efficiently and quickly capture PM (soot) in diesel engine exhaust and can quickly regenerate it for recycling. The device is not affected by the sulfur content of diesel oil and is suitable for the fuel quality of diesel oil in my country. The trapping device uses high-density wire mesh as the main body of the filter element, which improves the toughness and trapping rate of the device. Combined with an LPG back-blowing heating device, the internal temperature of the captured filter element can quickly reach 800°C, so that the captured PM can be burned rapidly and regeneration can be realized. 2. Technical Background [0002] With the development and progress of society, vehicles have become an indispensable means of transportation in people's daily life, especially since the 1990s, diesel engines have played an increasingly important role in ...

AI Technical Summary

Problems solved by technology

Since the sulfur content of diesel in developed countries such as the United States and Japan is very low, most of them use wall-flow DPF and catalyst coating to reduce the combustion temperature of PM to achieve continuous regeneration. Except for a few big cities such as Beijing, Shanghai, Guangzhou, etc., the excessive sulfur content of diesel supplied by most other cities and regions has been bothering and restricting the real implementation of my country's national IH emission regulations, and this situation is said to be in December 2009 Difficult to change before the end of the month

[0004] The search shows that the various bag-type smoke eliminators reported in China and the diesel particulate filter (DPF, Diesel Particulate Filter) with ceramic filter elements have various congenital deficiencies, and the domestic market has not yet seen products that have been put into production.

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