Abstract A device for feeding fluidized gas into a fluidized-bed vessel, particularly useful in the charring of coal at elevated temperatures, which comprises a series of relatively large pipes disposed near the bottom of the vessel, each affixed to the vessel at only one point to permit ready expansion and contraction, and having a plurality of holes therein to pass fluidizing gas into the vessel, a second smaller pipe in each of the large pipes through most of its length and open at the inner end, one pipe of each pair being connected to a source of fluidizing gas, and the other being connected through a valve to the outside. On start-up, or when finely-divided combustibles begin to accumulate in the large pipes during operation, the valves may be opened so that the fluidizing gas pressure blows out the particulate material, to minimize the occurrence of fires in the pipes with consequent damage.
In a fluidizing grid which supplies gas for fluidizing solids in a fluidizing vessel, which grid consists of a series of fluidizing-gas feed pipes distributed to substantially cover the cross section of the vessel near its lower end, each feed pipe being attached to the vessel to permit ready expansion and contraction, and also attached to a source of fluidizing gas, being closed at its inner end, and having at least one series of feed holes drilled therein, whereby the fluidizing gas is uniformly fed over the bottom of the fluidizing vessel, the improvement which permits in-process cleaning in which each feed pipe contains therein a second smaller pipe open at its inner end, one of the pipes being connected at its outer end of the source of fluidizing gas and the other pipe being connected at its outer end to the atmosphere through a valve, whereby on opening of the valve during operating the fluidizing gas will sweep solid matter out of the feed pipe through the valve.
Claim 2
Dependent Claim
169 words
In a fluidizing grid which supplies gas for fluidizing solids in a fluidizing vessel, which grid consists of a series of fluidizing-gas feed pipes distributed to substantially cover the cross section of the vessel near its lower end, each feed pipe being attached to the vessel to permit ready expansion and contraction, and also attached to a source of fluidizing gas, being closed at its inner end, and having at least one series of feed holes drilled therein, whereby the fluidizing gas is uniformly fed over the bottom of the fluidizing vessel, the improvement which permits in-process cleaning in which each feed pipe contains therein a second smaller pipe open at its inner end, one of the pipes being connected at its outer end of the source of fluidizing gas and the other pipe being connected at its outer end to the atmosphere through a valve, whereby on opening of the valve during operating the fluidizing gas will sweep solid matter out of the feed pipe through the valve.
Claim 3
Dependent Claim
29 words
The device of claim 1, in which the feed pipe is connected directly to the fluidizing-gas source, and the smaller pipe is connected to the atmosphere through a valve.
Claim 4
Dependent Claim
29 words
The device of claim 1, in which the feed pipe is connected to the atmosphere through a valve, and the smaller pipe is connected directly to the fluidizing-gas source.