Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Fluidized bed
Patent
1995-12-15
1997-12-23
Kim, Christopher
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
Fluidized bed
422109, 422198, 422200, 16510416, F27B 1514
Patent
active
057004323
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a fluidized-bed reactor suitable for supporting exothermic gas-phase reaction and capable of easily controlling the reaction temperature, as well as a temperature-controlling method for the fluidized-bed reactor. More particularly, the present invention relates to a fluidized-bed reactor used for carrying out an exothermic gas-phase reaction, for example, an oxidative reaction of a hydrocarbon compound by a large-scaled fluidized-bed reactor in an industrial scale, as well as a method of controlling the reaction temperature for a fluidized-bed.
BACKGROUND OF THE INVENTION
Reaction temperature in a fluidized-bed reactor of an industrial scale has generally been controlled by disposing a heat removing pipe in a fluidized-bed and flowing water through the pipe for recovering reaction heat as steam (refer to U.S. Pat. No. 3,156,538). Further, it has also been attempted to dispose heat-removing pipes separately in an upper portion and a lower portion of the fluidized-bed so as to control the temperature in the upper portion and the lower portion of the fluidized-bed separately (refer to U.S. Pat. No. 3,080,382). Further, in addition to the indirect heat removal by coolants, there has also been known a method of finely controlling the temperature of a fluidized-bed by adjusting the temperature of a reaction material supplied to a reactor, or a method of finely controlling the temperature of a fluidized-bed by increasing or decreasing the amount of generated heat by adjusting the feeding rate of the reaction material.
Generally, reaction performance and catalyst life of a catalyst used in a fluidized-bed reactor are often influenced greatly depending on working conditions. Also, it is necessary to keep the fluidized-bed in a satisfactory fluidizing condition. It is known that the fluidizing condition is greatly influenced by the gas-flowing rate and the particle size of the catalyst. Accordingly, it is preferable that the composition and the feeding rate of the reaction material are kept constant as much as possible.
However, even if the composition, the temperature and the feeding rate of the reaction material are controlled constant, the temperature of the fluidized-bed changes inevitably. Particularly, in a large-scale fluidized-bed reactor for industrial use having a diameter of not less than 0.5 m, it is extremely difficult to control the reaction temperature rapidly and accurately. Therefore, the reaction temperature rises excessively to degradate the catalyst, or in an extreme case, even detrimentally affects safe operation.
That is, even if the temperature fluctuation at the inside of the fluidized-bed is reduced by maintaining the factors which may be considered to give influence on the temperature of the fluidized-bed such as feed temperature, moisture, composition and feeding rate of the reaction material, as constant as possible, the temperature of the fluidized-bed still changes inevitably. Accordingly, for the catalyst to attain the highest reaction performance, it is indispensable to positively control and maintain the temperature of the fluidized-bed to an optimum temperature.
An object of the present invention is to provide a fluidized-bed reactor capable of rapidly corresponding with even a minute temperature change of the fluidized-bed, as well as a method of controlling the reaction temperature of the fluidized-bed reactor rapidly and accurately.
DISCLOSURE OF THE INVENTION
In accordance with a first aspect of the present invention, there is provided a fluidized-bed reactor capable of easily maintaining the temperature of the fluidized-bed to an optimum temperature, wherein a plurality of heat-removing pipes and at least one temperature detection section are disposed in a fluidized-bed forming portion. The heat-removing pipes are connected with coolant-feeding pipes and coolant-draining pipes at the outside of the reactor, and at least one of the heat-removing pipes comprises a heat-removing pipe supplied with coolants at a station
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patent: 5380497 (1995-01-01), Ivanov et al.
Supplementary European Search Report dated Jun. 4, 1996.
Process Heat Transfer By Donald Q. Kern, McGraw-Hill Book Company, Inc., New York, 1950, Chapters 3, 6, 7, 8, 19 and 20.
Hui Chi Wai
Tanaka Minoru
Kim Christopher
Mitsubishi Chemical Corporation
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