Method for positioning superheaters in biomass burning steam generators, and steam generator
US6672259B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Apr 17, 2003 |
| Grant date | Jan 6, 2004 |
| Priority date | — |
| Expiry date | Apr 17, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E20/12
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A method for positioning superheaters (2, 3, 4, 5) in biomass burning steam generators, and a steam generator. The steam generator comprises a combustion chamber (1), a flue gas duct (6), a steam circuit (7), and the superheaters (2, 3, 4, 5) positioned for minimizing corrosion at a high temperature. The steam generator is fitted with at least two superheaters (2, 3, 4, 5), whose positioning in the flue gas duct (6) and serial arrangement in the steam circuit (7) are effected in such a way that the superheater's or superheaters' heat transfer surface has its surface temperature remaining below the melting point of KOH, 406° C. (corresponds to a steam temperature of about 350-380° C.) down to the point in the flue gas duct (6), at which the flue gases' temperature has fallen to 750° C. While the flue gases are within the range of less than 750° C., the final superheating is effected to a higher temperature without significantly increasing the contamination and corrosion hazard for superheater surfaces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.