Pulverized coal combustion method
US5003891A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1990 |
| Grant date | Apr 2, 1991 |
| Priority date | — |
| Expiry date | Feb 26, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23K2201/10
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The known pulverized coal combustion method including the steps of separating pulverized coal mixture gas ejected from a vertical type coal grinder into thick mixture gas and thin mixture gas by a distributor, and injecting these thick and thin mixture gases, respectively, through separate burner injecting ports into a common furnace to make them burn, is improved so as to reduce both an unburnt content in the ash and a nitrogen oxide concentration in exhaust gas while maintaining an excellent ignition characteristic. The improvements reside in that an air-to-fuel ratio of the thick mixture gas is regulated to within the range of 1-2, while an air-to-fuel ratio of the thin mixture gas is regulated to within the range of 3-6, and the range of a degree of pulverization of the pulverized coal is regulated to 100 mesh residue 1.5% or less. The degree of pulverization of the pulverized coal fed to the distributor is regulated either by adjusting the rotational speed of a rotary type classifier in the grinder or by adjusting the angles formed between classifying vanes, rotating about the axis of the rotary type classifier, and the direction of rotation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.