| 摘要 |
In a solid fuel boiler where lighting and combustion take place in the bottom of a fire 1 the combustible gas in the combustion gas is burned in a second combustion zone composed of a central portion 8 and of a trough-shaped wall 10 surrounding the central portion. The trough-shaped wall separating the combustion gas from an air current which, via an opening 11 in the boiler's case, is sucked into and then along the lower side of the wall against the flow of the combustion gas and through holes 12 in the wall. Thus, the air is heated which gives an efficient combustion of combustible gas. The fire can be surrounded with heating plates 2 in order to increase its temperature so that tar and other impurities deposited on the wall can be burned. One or more of the plates may be mounted in an oblique position in order to prevent pieces of fuel from being encrusted thereon. <IMAGE> |
