SU74616A1 - Apparatus for reactions in the presence of a fine-grained catalyst suspended in a gas stream - Google Patents

Description

The present invention relates to contact apparatus designed for gas-phase processes in the presence of a fine-grained catalyst. Apparatuses of this type with the use of Field-Type tubes for the removal of heat from the contact zone are already known.

A feature of the proposed apparatus is that, in order to exclude heat exchange between gases passing through the Field’s external tube and gases discharged through the internal tubes into the contact zone, thermal insulation of the internal tubes is used.

The drawing shows a longitudinal section of the apparatus.

The main element of the apparatus are pipes / I 2, which are ordinary Field's tubes; the inner tubes 2 are covered with a thermal insulating layer 5. The number of pairs of such tubes depends on the performance of the apparatus and can be as large as desired.

Field tubes are mounted in a common casing.

The flow of gases going to the catalytic processing enters through the grouser 6 and enters the ring

section between insulations 5 of pipe 2 and internal walls of pipes.

Having passed the annular cross section from the bottom up, the flow enters the inside of the pipes 2 and descends from the top down. Pass pipe 2, the gas mixture is divided into two streams. One stream goes from the annular space 4, and the other through the nozzle 7 is removed from the apparatus into the heat exchanger to remove the excess heat of reaction.

The flow directed into the annular space moves in it at a rate that ensures the growth of the fine-grained catalyst on the entire height of the pipes 1. From the pipes / gas enters the separator 8, where, due to a sharp decrease in the flow rate, solid catalyst particles fall back into the m-annular space, and catalyst released from the reacted mixture is discharged through fitting 9.

Thus, the design of the apparatus allows high gas velocity at the entrance to the reaction zone (this is the main purpose of the Field tubes) without increasing the temperature of the gas stream as it passes through the inner tubes 2.

The removal of part of the gas stream through the nozzle 7 makes it possible to maintain the optimum temperature of the contact zone of the apparatus.

Subject invention

Claims (2)

1. An apparatus for reactions in the presence of a fine-grained catalyst suspended in a gas stream, made in the form of a vertical heat exchanger with Field tubes, and with the fact that, in order to completely eliminate heat exchange between gases, by external Field's tube 2, and gases discharged through the inner tubes}, the latter are covered with insulation 5. 2. The apparatus according to claim 1, wherein, in order to omit the already known method of heat removal from the contact zone by introducing a mixture of gases in an amount exceeding the amount of the mixture entering the contact space, the gas leaving the tubes / is partially directed into the contact space 4, and the rest of it is discharged through fitting 7. yr; y-y  l