초록 ▼

A fluidized bed combustion system for burning fuel particles, such as coal. The system includes a housing defining a first combustion region. An endless, flexible, perforate belt is shiftably mounted in the housing for supporting coal particles of relatively large size. A blower below the belt creat

A fluidized bed combustion system for burning fuel particles, such as coal. The system includes a housing defining a first combustion region. An endless, flexible, perforate belt is shiftably mounted in the housing for supporting coal particles of relatively large size. A blower below the belt creates fluidized air which entrains smaller coal particles in a fluidized bed above the larger coal particles. The combustion gases arising due to combustion of the coal particles passes through a secondary combustion region in which coal fines are burned. The combustion gases continue upwardly through a scrubber in which limestone particles are entrained in the combustion gases to strip sulfides therefrom. The limestone particles are regenerated by a cyclone separator while the combustion gases travel through a passage containing boilers or other heat exchangers, whereby the heat from the combustion gases is transferred to fluids in the boilers.

대표청구항 ▼

A fluidized bed combustion system comprising: means defining a primary combustion region; a movable, perforate support in said combustion region for supporting fuel particles; first fuel feed means adjacent to said defining means for feeding relatively large fuel particles toward and onto the suppor

A fluidized bed combustion system comprising: means defining a primary combustion region; a movable, perforate support in said combustion region for supporting fuel particles; first fuel feed means adjacent to said defining means for feeding relatively large fuel particles toward and onto the support; second fuel feed means spaced above the first fuel feed means for feeding relatively small fuel particles toward said support; means below the support for creating a flow of air upwardly through the support and into a zone above the support, whereby some of the fuel particles will be fluidized to present a fluidized bed within the combustion region; means above the primary combustion region for forming a secondary combustion region whereby fuel fines directed upwardly with the combustion gases from the primary combustion region can be burned; means at a location spaced above the secondary combustion region for scrubbing the combustion gases therefrom to remove the sulfur content, said scrubbing means including means for directing sorbent particles into the path of travel of the combustion gases flowing from said secondary combustion region; and means downstream of the scrubbing means for placing the combustion gases in heat exchange relationship to a fluid.