Exhaust treatment device of diesel engine

摘要

An exhaust treatment device of a diesel engine is provided in which combustible gas is burned with oxygen in exhaust, combustion heat increases a temperature of the exhaust, and heat of the exhaust can burn and remove PM accumulating in a DPF. In order to cause a heater for radiating heat at a start of generation of the combustible gas to enter a catalyst inlet portion, and fit a liquid fuel retaining member over a periphery of the heater, a guide plate is provided to a lower face of the liquid fuel retaining member so that the air-fuel mixture moving down in the liquid fuel retaining member flows along an upper face of the guide plate out to a periphery of the guide plate.

主权项

1. An exhaust treatment device of a diesel engine comprising:
a combustible gas generator,
a combustible gas generating catalyst chamber provided in the combustible gas generator,a combustible gas generating catalyst for generating combustible gas, housed in the combustible gas generating catalyst chamber and having a catalyst inlet portion at a central upper portion thereof and a catalyst outlet portion in a lower end portion thereof,a heater in the catalyst inlet portion of the combustible gas generating catalyst,a liquid fuel retaining member fitted over a periphery of the heater, anda guide plate positioned at a lower face of the liquid fuel retaining member, an air-fuel mixing chamber formed at an upper portion of the combustible gas generator, air and liquid fuel being supplied into the air-fuel mixing chamber to form an air-fuel mixture, a combustible gas release port, an exhaust passage, and a diesel particulate filter (DPF), wherein:
the air-fuel mixture is supplied from a lower end portion of the air-fuel mixing chamber to the combustible gas generating catalyst through the catalyst inlet portion, and flows down the liquid fuel retaining member and along an upper face of the guide plate to a periphery of the guide plate,the heater radiates heat to generate combustible gas from the air-fuel mixture by the combustible gas generating catalyst, the generated combustible gas flows out of the combustible gas generating catalyst through the catalyst outlet portion, and is released from the combustible gas release port into the exhaust passage on an upstream side of the DPF, andthe combustible gas is burned with oxygen in exhaust located in the exhaust passage, which creates combustion heat thereby increasing a temperature of the exhaust, and heat of the exhaust burning and removing particulate matter (PM) accumulating in the DPF.