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Method and device for the combustion of pulverised coal

Patent:

Abstract

Until now, high combustion space loadings in pulverised coal firing were only obtained with melting combustion, where the ash is fluid. The disadvantage of this is that part of the heating surface is covered by liquid slack, and this type of combustion cannot operate in 'on-off operation', as the slack solidifies when the boiler is switched off. According to the invention, however, pulverised coal, which is reluctant to react, can be burnt at high combustion space loadings of over 2000 Mcal/cu. metre. hour. atm. with dry ash extraction, so that its use is possible for the combustion in central heating plants in detached houses and blocks of flats, with 'on-off operation'. For this purpose, the pulverised coal is heated under excess pressure in an atmosphere with a maximum of 10% of oxygen with a speed of heating of 1000/sup 0/C/sec up to 100 to 150/sup 0/C above its ignition temperature, and can be blown into the combustion air. Tangentially to the flame jet, a cold gas flow is guided so that burning particles thrown out at the sides are cooled below the ash melting temperature, before they reach the walls. The burning flame jet is accelerated, by using the excess  More>>
Authors:
Publication Date:
Jan 13, 1977
Product Type:
Patent
Report Number:
DE 2527618; A
Reference Number:
ERA-04-017839; EDB-79-029483
Subject:
01 COAL, LIGNITE, AND PEAT; COAL FINES; COMBUSTION; COMBUSTION CHAMBERS; OPERATION; BURNERS; FUEL-AIR RATIO; CHEMICAL REACTIONS; OXIDATION; THERMOCHEMICAL PROCESSES; 014000* - Coal, Lignite, & Peat- Combustion
OSTI ID:
6769390
Country of Origin:
Germany
Language:
German
Submitting Site:
DE
Size:
Pages: 37
Announcement Date:

Patent:

Citation Formats

Schoppe, F. Method and device for the combustion of pulverised coal. Germany: N. p., 1977. Web.
Schoppe, F. Method and device for the combustion of pulverised coal. Germany.
Schoppe, F. 1977. "Method and device for the combustion of pulverised coal." Germany.
@misc{etde_6769390,
title = {Method and device for the combustion of pulverised coal}
author = {Schoppe, F}
abstractNote = {Until now, high combustion space loadings in pulverised coal firing were only obtained with melting combustion, where the ash is fluid. The disadvantage of this is that part of the heating surface is covered by liquid slack, and this type of combustion cannot operate in 'on-off operation', as the slack solidifies when the boiler is switched off. According to the invention, however, pulverised coal, which is reluctant to react, can be burnt at high combustion space loadings of over 2000 Mcal/cu. metre. hour. atm. with dry ash extraction, so that its use is possible for the combustion in central heating plants in detached houses and blocks of flats, with 'on-off operation'. For this purpose, the pulverised coal is heated under excess pressure in an atmosphere with a maximum of 10% of oxygen with a speed of heating of 1000/sup 0/C/sec up to 100 to 150/sup 0/C above its ignition temperature, and can be blown into the combustion air. Tangentially to the flame jet, a cold gas flow is guided so that burning particles thrown out at the sides are cooled below the ash melting temperature, before they reach the walls. The burning flame jet is accelerated, by using the excess pressure, via an injector, into a zone at less than the ash melting temperature, so that dry ash extraction is guaranteed.}
place = {Germany}
year = {1977}
month = {Jan}
}