Sulfur rate control system
US5229077A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1991 |
| Grant date | Jul 20, 1993 |
| Priority date | — |
| Expiry date | Aug 16, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/129
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A system is provided for maintaining the concentration of sulfur oxides in a flue duct (60) at a predetermined value. The sulfur oxides being maintained at a concentration to substantially optimize the particulate removal performance of an electrostatic precipitator (70). The sulfur rate control system (100) injects sulfur trioxide into the flue gas in proportion to a deficiency in the content of sulfur oxides in the flue gas, with respect to the proportion to particulates being carried by the flue gas. The sulfur trioxide is formed in a catalytic converter (54) which is supplied with sulfur dioxide and oxygen from a reaction chamber (40). The formation of sulfur dioxide is controlled by metering the source of sulfur responsive to a signal provided from a ratio controller (64). Ratio controller (64) supplies an output signal proportional to the difference between a predetermined value based on the particulate flow rate measured by the flow transmitter (66) and the content of sulfur oxides of the flue gas measured by the analyzer (68). The output signal from the ratio controller (64) is coupled to a speed controller (38) having one output (37) for controlling the speed of the sulfur…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.