Fluidised Bed: Difference between revisions

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==Types of Fluidised Bed==

The three types of [[Fluidised Bed]] [[Incineration|incinerators]] are used for waste [[Incineration|incineration]] according to gas speeds and the design of the nozzle plate/~~grate~~ surface. These are: stationary/or bubbling fluidised bed, rotating fluidised bed and circulating fluidised bed.

The three types of [[Fluidised Bed]] [[Incineration|incinerators]] are used for waste [[Incineration|incineration]] according to gas speeds and the design of the nozzle plate/bed surface. These are: stationary/or bubbling fluidised bed, rotating fluidised bed and circulating fluidised bed.

===Stationary/Bubbling Fluidised Bed===

The stationary/bubbling [[Fluidised Bed]] [[Incineration|incinerator]] consists of a cylindrical or rectangular lined [[Incineration|incineration]] chamber (nozzle bed~~/grate~~ surface) and a start-up burner. Preheated air flows up through a distribution plate and fluidises the bed material. Depending on the application, various bed materials (silica sand, basalt, mullite etc) and bed particle sizes (approximately 0.5-3mm) can be used. The [[Waste|waste]] can be loaded via the head, on the sides with belt-charging machines, or directly injected into the [[Fluidised Bed]]. In the bed, the [[Waste|waste]] is mixed with hot bed material/sand, dried and partially [[Incineration|incinerated]]. The remaining fractions (volatile and fine particles) are [[Incineration|incinerated]] above the [[Fluidised Bed]] in the freeboard/secondary [[Incineration|incineration]] chamber. The remaining ash is removed with the [[Flue Gas|flue gas]] at the head of the furnace<ref name="ref2" />.

The stationary/bubbling [[Fluidised Bed]] [[Incineration|incinerator]] consists of a cylindrical or rectangular lined [[Incineration|incineration]] chamber, a nozzle plate/bed surface and a start-up burner. Preheated air flows up through a distribution plate and fluidises the bed material. Depending on the application, various bed materials (silica sand, basalt, mullite etc) and bed particle sizes (approximately 0.5-3mm) can be used. The [[Waste|waste]] can be loaded via the head, on the sides with belt-charging machines, or directly injected into the [[Fluidised Bed]]. In the bed, the [[Waste|waste]] is mixed with hot bed material/sand, dried and partially [[Incineration|incinerated]]. The remaining fractions (volatile and fine particles) are [[Incineration|incinerated]] above the [[Fluidised Bed]] in the freeboard/secondary [[Incineration|incineration]] chamber. The remaining ash is removed with the [[Flue Gas|flue gas]] at the head of the furnace<ref name="ref2" />.

Stationary/bubbling [[Fluidised Bed]] [[Incineration|incinerators]] are used in the treatment of [[Sewage Sludge|sewage sludge]], other industrial sludges such as petrochemical and chemical industry sludges and [[Waste|wastes]] from the wastewater treatment process (e.g., swim scum, screenings, and extracted fats). Plants receiving partially dried sludge require less additional fuels than plants receiving raw sludges. In addition, coal and [[Plastic|plastic]] solid [[Waste|waste]] can be processed<ref name="ref1" />.

@@ Line 13: / Line 13: @@
 ==Types of Fluidised Bed==
-The three types of [[Fluidised Bed]] [[Incineration|incinerators]] are used for waste [[Incineration|incineration]] according to gas speeds and the design of the nozzle plate/grate surface. These are: stationary/or bubbling fluidised bed, rotating fluidised bed and circulating fluidised bed.
+The three types of [[Fluidised Bed]] [[Incineration|incinerators]] are used for waste [[Incineration|incineration]] according to gas speeds and the design of the nozzle plate/bed surface. These are: stationary/or bubbling fluidised bed, rotating fluidised bed and circulating fluidised bed.
 ===Stationary/Bubbling Fluidised Bed===
 [[File:Main components of a stationary or bubbling fluidised bed.png|350px|right|Main components of a stationary/bubbling fluidised bed. All rights reserved.]]
-The stationary/bubbling [[Fluidised Bed]] [[Incineration|incinerator]] consists of a cylindrical or rectangular lined [[Incineration|incineration]] chamber (nozzle bed/grate surface) and a start-up burner. Preheated air flows up through a distribution plate and fluidises the bed material. Depending on the application, various bed materials (silica sand, basalt, mullite etc) and bed particle sizes (approximately 0.5-3mm) can be used. The [[Waste|waste]] can be loaded via the head, on the sides with belt-charging machines, or directly injected into the [[Fluidised Bed]]. In the bed, the [[Waste|waste]] is mixed with hot bed material/sand, dried and partially [[Incineration|incinerated]]. The remaining fractions (volatile and fine particles) are [[Incineration|incinerated]] above the [[Fluidised Bed]] in the freeboard/secondary [[Incineration|incineration]] chamber. The remaining ash is removed with the [[Flue Gas|flue gas]] at the head of the furnace<ref name="ref2" />.
+The stationary/bubbling [[Fluidised Bed]] [[Incineration|incinerator]] consists of a cylindrical or rectangular lined [[Incineration|incineration]] chamber, a nozzle plate/bed surface and a start-up burner. Preheated air flows up through a distribution plate and fluidises the bed material. Depending on the application, various bed materials (silica sand, basalt, mullite etc) and bed particle sizes (approximately 0.5-3mm) can be used. The [[Waste|waste]] can be loaded via the head, on the sides with belt-charging machines, or directly injected into the [[Fluidised Bed]]. In the bed, the [[Waste|waste]] is mixed with hot bed material/sand, dried and partially [[Incineration|incinerated]]. The remaining fractions (volatile and fine particles) are [[Incineration|incinerated]] above the [[Fluidised Bed]] in the freeboard/secondary [[Incineration|incineration]] chamber. The remaining ash is removed with the [[Flue Gas|flue gas]] at the head of the furnace<ref name="ref2" />.
 Stationary/bubbling [[Fluidised Bed]] [[Incineration|incinerators]] are used in the treatment of [[Sewage Sludge|sewage sludge]], other industrial sludges such as petrochemical and chemical industry sludges and [[Waste|wastes]] from the wastewater treatment process (e.g., swim scum, screenings, and extracted fats). Plants receiving partially dried sludge require less additional fuels than plants receiving raw sludges. In addition, coal and [[Plastic|plastic]] solid [[Waste|waste]] can be processed<ref name="ref1" />.