CN2774634Y

CN2774634Y - Finned tube cooling type single bed layer tube type reactor

Info

Publication number: CN2774634Y
Application number: CN 200520078309
Authority: CN
Inventors: 郭新峰; 赵仕哲
Original assignee: Xian Aerospace Huawei Chemical and Biologic Engineering Co Ltd
Current assignee: Xian Aerospace Huawei Chemical and Biologic Engineering Co Ltd
Priority date: 2005-01-31
Filing date: 2005-01-31
Publication date: 2006-04-26
Anticipated expiration: 2015-01-31

Abstract

The utility model relates to a finned tube cooling type single bed layer tubular reactor. In China, in the production techniques of producing acrolein and acrylic acid in a two-step method by taking propylene as raw materials, a two-segment reactor with a middle tube plate is adopted, but because the two reaction segments have heat media with different temperatures, the reactor has the stress problem due to the temperature difference of a tube between the sagging plate and a reactor housing body and the connection problem which normally is a hydraulic expanding connection problem of the middle tube plate and a reaction tube; because the distance between the sagging plate and a fixed tube pipe is long, the expanding connection technology is complicated; if the treatment is improper, the two reaction segments are mixed with each other to affect the normal proceed of the reaction. The reactor of the utility model is a segment of reaction bed, a finned tube cooler is arranged in a tube box under a lower tube pipe; thus, the utility model is a finned tube cooling type single bed layer tubular reactor having the advantages of reasonable structure, simple fabrication and high heat-transfer efficiency.

Description

Finned tube cooled list bed tubular reactor

One, technical field:

The utility model relates to a kind of finned tube cooled list bed tubular reactor.

Two, technical background:

Be raw material at home with the propylene, all adopt the two section reactor that sagging plate is arranged in two-step method oxidation system third rare aldehyde, the acrylic acid production technology, its reaction tube is that the many vertical pipes of placing constitute, sagging plate is divided into two reative cells with different temperatures section with reaction tube, finish from the corresponding reaction of section each chamber, but because two hot medias that conversion zone has different temperatures, there is following problem in this reactor: 1, the stress problem that causes owing to the pipe temperature difference between sagging plate and reactor shell; 2, sagging plate is connected (being generally the hydraulic pressure account connects) problem with reaction tube; Because sagging plate is longer apart from fixed tube sheet, make account connect complex process, loaded down with trivial details, to deal with improperly and cause two conversion zone hot medias to be gone here and there mutually, the influence reaction is normally carried out.

Three, summary of the invention:

The purpose of this utility model be to provide a kind of rational in infrastructure, make the finned tube cooled list bed tubular reactor simple, that heat transfer efficiency is high.

For achieving the above object, the technical solution adopted in the utility model is:

A kind of finned tube cooled list bed tubular reactor, comprise housing 1, upper perforated plate 2, lower perforated plate 3, conversion zone, heating agent EGR that a plurality of reaction tubes 4 form, its special character is: described reactor is one section reaction bed 5, and finned tube cooling device 6 is set in the bobbin carriage below lower perforated plate 3.

Above-mentioned one-part form reactor shell 1 is outer to be provided with hot media equivalent, radially enter cocircuit 7 and following circuit 8 between pipe.

Above-mentioned conversion zone heating agent EGR comprises axial-flow pump 9, the steam generator 10 that directly links to each other with upper and lower circuit.

Finned tube cooling device 6 in the above-mentioned lower tube box comprises finned tube 11, hot media delivery pump 12 and steam generator 13.

The utility model is with respect to prior art, and its advantage is as follows:

1, reactor of the present utility model is one section reaction bed, and only needing to finish propylene oxidation through one section bed is acrolein reaction;

2, the utility model does not have sagging plate, cancels a large amount of account plumber's prefaces, saves cost; Need not solve exhaust, the discharge opeing difficult problem at sagging plate place;

3, the utility model has been cancelled the swollen account joint between sagging plate and housing;

4, there is not the mutual string phenomenon that sagging plate both sides hot media produces owing to the account pipe is bad in the utility model;

5, the utility model adopts fintube cooler, improves heat-transfer effect;

Four, description of drawings:

Fig. 1 is the structural representation of existing many bed reactors;

Fig. 2 is the utility model overall structure schematic diagram;

Five, the specific embodiment:

Referring to Fig. 1, be raw material with the propylene at home, all adopt the two section reactor that sagging plate is arranged in two-step method oxidation system third rare aldehyde, the acrylic acid production technology.

Referring to Fig. 2, reactor of the present utility model is one section reaction bed 5, and one section (single bed) shell and tube reactor of its no sagging plate is finished the reaction that propylene oxidation is a methacrylaldehyde.Finned tube cooling device 6 is set in the bobbin carriage below lower perforated plate 3, and it comprises finned tube 11, hot media delivery pump 12 and steam generator 13.In order to cooling reaction back gas, to reduce the side reaction of gas.Hot media equivalent is set outside one-part form reactor shell 1, radially enters cocircuit 7 and following circuit 8 between pipe.Conversion zone heating agent EGR of the present utility model comprises axial-flow pump 9, the steam generator 10 that directly links to each other with upper and lower circuit.

During use, enter the reaction tube 4 of reactor after propylene, oxygen (air), water vapour mix, by the beds in managing, propylene oxidation generates methacrylaldehyde and a small amount of acrylic acid.This is exothermic reaction, reaction heat reaches the hot media outside the pipe outside reaction tube 4, hot media is squeezed into down circuit 8 by axial-flow pump 9, through the perforate equivalent on the reactor, entering between reaction tube radially, take away reaction heat, return axial-flow pump 9 inlets after flowing into cocircuit 7, steam generator 10 again.Hot media and reaction tube 4 can be axially parallel stream or cross-flow passes.The hot media that flows in the pipe of fintube cooler 11, medium can be fused salt, conduction oil or boiler feedwater, hot media is squeezed into finned tube 11 through pump 12 and is taken away heat, through steam generator 13 heat is moved on to outside the circulatory system.The finned tube outer wall arrives reacted gas cooled the temperature that needs.

Claims

1, a kind of finned tube cooled list bed tubular reactor, comprise housing (1), upper perforated plate (2), lower perforated plate (3), conversion zone, heating agent EGR that a plurality of reaction tubes (4) form, it is characterized in that: described reactor is one section reaction bed (5), and finned tube cooling device (6) is set in the bobbin carriage below lower perforated plate (3).

2, finned tube cooled list bed tubular reactor according to claim 1 is characterized in that: described one-part form reactor shell (1) is outer to be provided with hot media equivalent, radially enter cocircuit (7) and following circuit (8) between pipe.

3, finned tube cooled list bed tubular reactor according to claim 1 and 2, it is characterized in that: described conversion zone heating agent EGR comprises axial-flow pump (9), the steam generator (10) that directly links to each other with upper and lower circuit.

4, finned tube cooled list bed tubular reactor according to claim 3 is characterized in that: the finned tube cooling device (6) in the described lower tube box comprises finned tube (11), hot media delivery pump (12) and steam generator (13).