Method for controlling bed temperature of fixed bed hydrogenation reactor

Abstract

The invention discloses a method for controlling the bed temperature of a fixed bed hydrogenation reactor to solve the problems of multiple cycle logistics in current fixed bed hydrogenation systems and big radial bed temperature variations of the reactor. The method comprises the following steps: hydrocarbon raw materials and hydrogen undergo hydrogenation reaction in the reactor; cold oil and recycle hydrogen are mixed and then injected among the beds of the reactor so as to control the catalyst bed temperature in the reactor; the volume flow ratio of the mixed cold oil and recycle hydrogen is 0.1-0.2. With the method of the invention adopted, the cycle logistics in the reaction system are less, the catalyst bed temperature is effectively controlled, the radial bed temperature variations of the reactor are small, the conversion ratio of the hydrogenation reaction and the product quality are not affected and simultaneously the invention and energy consumption of the device are reduced, etc.

Description

technical field [0001] The invention belongs to a method for controlling the temperature of a reactor in the field of petrochemical industry. Specifically, the invention relates to a method for controlling the bed temperature of a fixed-bed hydrogenation reactor. Background technique [0002] Since the hydrogenation reaction is an exothermic reaction, there is a temperature rise in the catalyst bed. In order to effectively control the reaction temperature, the catalyst in the fixed-bed hydrogenation reactor is usually divided into multiple beds, and cold hydrogen is injected between the beds to reduce the temperature of the catalyst bed. layer temperature. However, the specific heat of hydrogen is small, which requires the injection of a large amount of hydrogen to meet the demand. The cold hydrogen needs to be provided by the circulating hydrogen compressor in the device, which requires the circulating hydrogen compressor to provide this part of cold hydrogen in addition t...

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Problems solved by technology

Its disadvantages are: the use of hydrogenated raw oil as cold oil cannot ensure that the cold oil is completely vaporized in the reactor, so the amount of cold oil used is large (10-30% of the raw oil); in addition, since the cold oil is added in the middle of the reactor, This part of the cold oil hydrogenation reaction is incomplete, which will affect the conversion rate of the reaction and product quality; the problem of large radial temperature difference of the hydrogenation reactor bed due to the change of the injection amount of the cold oil still exists

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