Fluidized-bed reactor and insert for said fluidized-bed reactor

Abstract

The invention relates to a fluidized-bed reactor having a higher power density and to an exchangeable insert for said fluidized-bed reactor, which insert makes the higher power density possible. The supply and pre-heating of the fluidizing agent, especially air, to the fluidized bed is combined with the cooling of the reactor vessel wall owing to the preferably exchangeable insert in the fluidized-bed reactor. The ''cold'' fluidizing agent is guided in at least one flow channel in the metal jacket surrounding the fluidized bed and is preheated and said channel and is then injected into the fluidized bed in an appropriate location. The reactor vessel wall is cooled by pre-heating the fluidizing agent.; The desired and required values for cooling the reactor vessel and the desired pre-heating of the fluidizing agent can be adjusted by suitably selecting the parameters 'length' and 'volume' of the flow channels in the insert and the flow rate of the fluidizing agent in the flow channels. The insert is used for supplying the fluidizing agent and for cooling the reactor vessel, thereby eliminating the need for a separate cooling device for the reactor vessel and for lining the reactor vessel with refractory clay. The reactor vessel according to the invention is compact, has a high power density and small thermal masses.

Description

technical field [0001] The invention relates to a fluidized bed reactor. According to claim 1, the fluidized bed reactor comprises an insert surrounding the fluidized bed for supplying a fluidizing agent and cooling down the reactor vessel. According to claim 20, the invention also relates to the insert. Background technique [0002] When using a reactor including a fluidized bed and carrying out chemical reactions therein, extremely high temperatures of up to around 900° C. are generated. This is especially the case in combustion chambers with fluidized bed combustion systems, and in fluidized beds in which combustion gases are produced by indirect thermal (allotherme) steam gasification of carbonaceous feedstocks. In order to make the reactor vessel difficult to resist such high temperatures for a relatively long time, the inner wall of the combustion chamber must be lined with refractory materials, especially refractory clay. In this way, the thermal mass of the combus...

AI Technical Summary

Problems solved by technology

The airflow around the insert is not properly directed to cool the insert evenly

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