Coal fired process heaters
US7644669B2 · kind B2 · utility
Inventor
Key dates
| Filing date | May 3, 2007 |
| Grant date | Jan 12, 2010 |
| Priority date | — |
| Expiry date | Dec 29, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49616
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
An embodiment of the invention consists of a process heater with a radiant section and an overhead convection section, the radiant section having a vertical cylindrical, contiguous, helical, tubular coil, having a bottom process fluid inlet and top process fluid outlet. The process fluid coil is contained in a refractory lined enclosure of square cross section and is exposed to an up flowing stream of combustion products, generated by burning coal on a continuous, traveling, chain grate stoker. The stoker is located at the base of the radiant section, receives a continuous deposit of coarse coal, with a minimum of fines, from a hopper located at one end of the stoker chain grate and discharges essentially coal free ash at the opposite end of the chain grate, thru a nozzle provided with a water seal. One or more centrifugal solids—gas separators are provided at the radiant section flue gas outlets for the purpose of removing ash particulates from the flue gas streams, before the latter enter the overhead convection section. Since the flue gas enters the convection section very nearly devoid of particulates, the convection section may be of conventional design, utilizing bare or exte…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.