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US 6,649,910 B2Granted
Analytical apparatus
AssigneeHitachi, Ltd.
InventorMinoru Sakairi
Life of this patent
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Abstract
For measuring dioxins and organic nitro compounds with high sensitivity while reducing complexity, efficiently ionize a sample using negative corona discharge; then, make use of a mass spectrometer to measure negatively charged ions produced.
Claims5
An incinerator system comprising:
- an incinerator having a smoke path;
- a monitor unit for continuously monitoring exhaust gas components in said smoke path;
- a gas sampling unit for sampling the exhaust gas components from said smoke path and for carrying the exhaust gas components to said monitor unit with a constant flow rate by using a sampling nozzle disposed in said smoke path, a valve, a filter and a pump;
- and
- a combustion control unit to control combustion condition of said incinerator by the measurement results by said monitor unit;
- wherein said monitor unit includes:
- a gas inlet pipe for introducing the exhaust gas components;
- a corona discharge chamber having a needle electrode;
- a gas feed pump for introducing the exhaust gas components to said corona discharge chamber;
- a corona discharge power supply for supplying a negative voltage to said needle electrode;
- a surplus gas exhaust port for releasing surplus gases residing within said corona discharge chamber;
- a mass spectrometer for mass-analyzing ions created by corona discharge;
- and
- means for adjusting a pressure in said corona discharge chamber to a desired level.
11 more elements
Dependencies are inferred from the claim text.