Exhaust gas purification apparatus, and method for thawing liquid reducing agent or precursor thereof
AssigneeUd Trucks Corporation
InventorYasuyoshi Tomita
Life of this patent
Estimating the term…
Abstract
An exhaust gas purification apparatus includes: a reduction catalyst converter that reduces and purifies nitrogen oxides in exhaust gas; a tank that stores a liquid reducing agent or precursor thereof; and an injection nozzle that injects the liquid reducing agent or precursor thereof stored in the tank on an exhaust gas upstream side of the reduction catalyst converter. Some of the exhaust gas flowing through an exhaust pipe is diverted to the tank by a bypass pipe, to cause an exchange of heat between the diverted exhaust gas and the liquid reducing agent or precursor thereof stored in the tank, thereby thawing the liquid reducing agent or precursor thereof frozen in the tank.
Claims11
An exhaust gas purification apparatus comprising:
- a reduction catalyst converter configured to reduce and purify nitrogen oxides in exhaust gas;
- a tank configured to store a liquid reducing agent or precursor thereof;
- an injection nozzle configured to inject the liquid reducing agent or precursor thereof stored in the tank on an exhaust gas upstream side of the reduction catalyst converter;
- a bypass pipe configured to allow some of the exhaust gas flowing through an exhaust pipe to be diverted to the tank, to cause an exchange of heat between the diverted exhaust gas and the liquid reducing agent or precursor thereof stored in the tank;
- and
- an outside-air mixer configured to mix outside air with the exhaust gas flowing through the bypass pipe to reduce a temperature of the exhaust gas.
A method for thawing a liquid reducing agent or precursor thereof, comprising the step of heating a tank storing a liquid reducing agent or precursor thereof to be injected on an exhaust gas upstream side of a reduction catalyst converter that reduces and purifies nitrogen oxides in exhaust gas, with some of the exhaust gas flowing through an exhaust pipe diverted to the tank through a bypass pipe, so that the liquid reducing agent or precursor thereof frozen in the tank is thawed, wherein an outside air is mixed with the exhaust gas flowing through the bypass pipe to reduce a temperature of the exhaust gas.
Dependencies are inferred from the claim text.