US 2011/0252771 A1 · FLUE GAS PURIFYING DEVICE

Abstract

An object of the present invention is to provide a flue gas purifying device that can suppress leakage of ammonia and can efficiently decrease nitrogen oxides in flue gas. The object is achieved by including: an exhaust pipe that guides flue gas discharged from an internal combustion engine; a urea-water injecting unit that injects urea water into the exhaust pipe; a catalyst unit that includes a urea SCR catalyst that promotes a reaction between ammonia produced from injected urea water and nitrogen oxides and a support mechanism arranged inside of the exhaust pipe on a downstream side to a position where urea water is injected in a flow direction of the flue gas to support the urea SCR catalyst; an ammonia-concentration measuring unit that measures an ammonia concentration in flue gas at a measurement position in a region where the SCR catalyst is arranged; and an injection control unit that controls injection of urea water based on a measurement result acquired by the ammonia-concentration measuring unit.

Claims6

Dependent claims

A flue gas purifying device that reduces nitrogen oxides contained in flue gas discharged from an internal combustion engine, the device comprising:

an exhaust pipe that guides flue gas discharged from the internal combustion engine;
an ammonia supplying unit that supplies ammonia into the exhaust pipe;
a catalyst unit that includes an SCR catalyst that promotes a reaction between supplied ammonia and the nitrogen oxides and a support mechanism arranged inside of the exhaust pipe to support the SCR catalyst in the exhaust pipe, and is arranged on a downstream side to a position where the ammonia is supplied in a flow direction of the flue gas;
an ammonia-concentration measuring unit that measures an ammonia concentration in flue gas at a measurement position in a region where the catalyst unit is arranged;
and
an injection control unit that controls supply of ammonia performed by the ammonia supplying unit based on a measurement result acquired by the ammonia-concentration measuring unit.

3 more elements

A flue gas purifying device that reduces nitrogen oxides contained in flue gas discharged from an internal combustion engine, the device comprising:

an exhaust pipe that guides flue gas discharged from the internal combustion engine;
a urea-water injecting unit that injects urea water into the exhaust pipe;
a catalyst unit that includes a urea SCR catalyst that promotes a reaction between ammonia produced from injected urea water and the nitrogen oxides and a support mechanism arranged inside of the exhaust pipe to support the urea SCR catalyst in the exhaust pipe, and is arranged on a downstream side to a position where the urea water is injected in a flow direction of the flue gas;
an ammonia-concentration measuring unit that measures an ammonia concentration in flue gas at a measurement position in a region where the catalyst unit is arranged;
and
an injection control unit that controls injection of urea water performed by the urea-water injecting unit based on a measurement result acquired by the ammonia-concentration measuring unit.

3 more elements

Dependencies are inferred from the claim text.

Flue gas purifying device

Life of this patent

Flue gas purifying device

Life of this patent

Abstract

Claims6