Gas analysis apparatus
AssigneeHoriba, Ltd.
InventorShigeru Nakatani
Life of this patent
Estimating the term…
Abstract
In order to completely decompose remaining urea contained in exhaust gas emitted from an internal combustion engine to make it possible to accurately measure an amount of the remaining urea, as well as preventing measurement accuracy and reliability from being damaged by some cause such as the attachment of powdery urea on a sensor, a gas analysis apparatus is provided with a filter part that is provided between a sampling port and a produced substance measuring mechanism in a mixed gas sampling pipe to collect urea in a solid state or in a state of being dissolved in water in mixed gas.
Claims7
A gas analysis apparatus comprising:
- a mixed gas sampling pipe that does not provide a flow path to a selective catalytic reduction (SCR) catalyst and that, from a sampling port formed on one end side inside an exhaust gas pipe, samples mixed gas that is a mixture of exhaust gas emitted from an internal combustion engine and a misty urea aqueous solution;
- a decomposition reaction controlling mechanism that controls a decomposition reaction of urea or isocyanic acid in the mixed gas sampling pipe;
- a produced substance measuring mechanism that is provided on an other end side of the mixed gas sampling pipe downstream from the decomposition reaction controlling mechanism and measures a value related to an amount of a substance produced from the urea or the isocyanic acid in the urea aqueous solution;
- a calculation part configured to calculate an amount of the urea contained in the mixed gas, on a basis of a measured value measured by the produced substance measuring mechanism;
- and
- a filter, including fibers, that is provided between the sampling port and the produced substance measuring mechanism in the mixed gas sampling pipe to collect the urea in a solid state or in a state of being dissolved in water in the mixed gas, wherein the decomposition reaction controlling mechanism is configured to control a temperature of the filter or a voltage applied to the filter.
A gas analysis apparatus comprising:
- a mixed gas sampling pipe that that does not provide a flow path to a selective catalytic reduction (SCR) catalyst and that, from a sampling port formed on one end side inside an exhaust gas pipe, samples mixed gas that is a mixture of exhaust gas emitted from an internal combustion engine and a misty urea aqueous solution;
- a decomposition reaction controlling mechanism that controls a decomposition reaction of urea or isocyanic acid in the mixed gas sampling pipe;
- a produced substance measuring mechanism that is provided on an other end side of the mixed gas sampling pipe downstream from the decomposition reaction controlling mechanism and measures a value related to an amount of a substance produced from the urea or the isocyanic acid in the urea aqueous solution;
- a calculation part configured to calculate an amount of the isocyanic acid contained in the mixed gas, on a basis of a measured value measured by the produced substance measuring mechanism;
- and
- a filter, including fibers, that is provided between the sampling port and the produced substance measuring mechanism in the mixed gas sampling pipe to collect the urea in a solid state or in a state of being dissolved in water in the mixed gas, wherein the decomposition reaction controlling mechanism is configured to control a temperature of an inside of the mixed gas sampling pipe on the downstream side of the filter.
Dependencies are inferred from the claim text.