Method of controlling the temperature of a reaction carried out in a fluidised bed reactor

Abstract

Method of controlling the temperatures of an exothermic process carried out in a suspension of solids in a reactor system formed by a wind box ( ), a vertical riser ( ), which is essentially not cooled, a particle separator ( ), at least one set of recycling channels ( ), which are not cooled, and at least one cooled set of recycling channels ( ). According to the invention, the flow of solids travelling through the recycling channel ( ), which is no cooled, as adjusted based on the temperature difference (T −T ) between the upper and lower parts of a riser ( ), which is not cooled, and the flow of solids travelling through the heat exchanger ( ) is adjusted based on the temperature (T ) of the lower part or the temperature (T ) of the upper part of the riser tube. The control of the riser temperature is thus exclusively based on the regenerative heat transfer of the solids returned from the heat exchangers. In order for the solids returning from the heat exchanger not to create too great a temperature difference in the riser tube, solids that are not cooled are also returned to the lower part of the riser chamber in accordance with the set point control of the temperature difference of the riser tube. As all the temperatures of the thermally insulated riser tube are between the temperatures of its lower and upper parts, a perfect temperature control of the reactor is achieved by means of the simple method according to the invention.