CN201087180Y

CN201087180Y - Fixed bed reactor group for producing benzoic anhydride by ortho-xylene with yearly capacity of 50 thousand ton

Info

Publication number: CN201087180Y
Application number: CNU2007200317996U
Authority: CN
Inventors: 邰向阳; 赵仕哲; 郭新峰
Original assignee: Xian Aerospace Huawei Chemical and Biologic Engineering Co Ltd
Current assignee: Xian Aerospace Huawei Chemical and Biologic Engineering Co Ltd
Priority date: 2007-05-15
Filing date: 2007-05-15
Publication date: 2008-07-16
Anticipated expiration: 2017-05-15

Abstract

The utility model relates to a chemical reacting device unit with annual output of 50,000 tons for benzene production taking oxylene as the raw material. The prior reacting device unit with annual output of 20,000 tons has the following problems that: firstly, the productivity of a single set of the device is limited and can not meet the requirements of the market development; secondly, the energy consumption of the unitary output is great when the device is used, the effective utilization factor is low, and the operating cost of the equipment is high; thirdly, a fused salt pump is adopted to perform heat shifting, the heat quantity is centralized and can not be shifted out easily; fourthly, the reaction surplus heat is rather little, and can not be fully utilized. In order to solve the problems, the reacting device of the utility model adopts a double-pump cycling technology, a circular track perforating design, and a radial hole expanding technology of a baffle plate, and the flowing type of the heat exchanging medium at the inner part adopts the cross flowing accompanied with slight paralleled flowing, ensuring the heat shifting of the reacting device to be more uniform; the heat exchanging medium can uniformly enter into and exit the reacting device from the upper and the lower circular tracks; the operating cost is saved; the axial and radial temperature difference at the inner part of the reacting device is effectively controlled; and the productivity of the device and the heat exchanging efficiency of the system are enhanced.

Description

Produce the fixed-bed reactor group of 50,000 tons o-Xylol production phthalic anhydride per year

Technical field:

It is that raw material carries out the chemical reactor group that phthalic anhydride is produced that the utility model relates to a kind of o-Xylol that adopts, and its yearly capacity is 50,000 tons of phthalic anhydrides.

Technical background:

In the prior art, be that raw material carries out the device that phthalic anhydride is produced with the o-Xylol, the separate unit throughput maximum of its device all at 20,000 tons/year, its molten salt circulating pump that moves hot usefulness all is to adopt one to carry out.There is following problem in 20,000 tons of/year set of reactors: 1, Zhuan Zhi separate unit throughput is limited, can't satisfy the demand of market development; 2, device uses time unit's output energy consumption big, and effective rate of utilization is low, equipment running cost height; 3, move heat with a pump for liquid salts, heat is concentrated, and is difficult to shift out; 4, residual heat of reaction can't make full use of very little.

Summary of the invention:

The purpose of this utility model is to overcome the defective that exists in the prior art, provide a kind of rational in infrastructure, move heat evenly, the o-Xylol of 50,000 tons of low annual outputs of energy consumption produces the fixed-bed reactor of phthalic anhydride.

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

A kind of o-Xylol of producing 50000 tons per year is produced the fixed-bed reactor of phthalic anhydride, comprise upper cover bobbin carriage 1, upper tubesheet 2, housing 4, reaction tubes 5, lower tubesheet 8, lower cover bobbin carriage 9 constitute reactor body, and adopt pump to circulate, described housing 4 is provided with cocircuit 3 and following circuit 7, two cover recycle pump 10 and fused salt water coolers 11 are set respectively between cocircuit 3 and following circuit 7, have the hole that size equates on the housing 4 in described upper and lower circuit, be provided with outside the hole and cover the cover plate 16 that flux does not wait; Described reaction tubes 5 specifications are Φ 30 * 2.5 * 3700mm, and reaction tubes 5 quantity are 20000, housing 4 diameter 6300mm.。

The rule of arranging in the hole 17 of covering orifice plate is for to be reduced successively to the two side holes height by inlet mouth on the housing in the described cocircuit; The rule of arranging in the hole 17 of covering orifice plate is for to be increased successively to the two side holes height by the air outlet on the housing in the described circuit down.

Upper, middle and lower portion in the described housing 4 is equipped with traverse baffle 6, and the pore size on this traverse baffle 6 does not wait.

Vaporizer 12 is housed before the described reactor inlet, is connected with electric heater 13, vapor superheater 14, variable valve and equilibrium valve 15 on the reactor fused salt circuit.

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

1, reactor of the present utility model adopts the double pump circulating technology, make reactor to move heat more even;

2, reactor of the present utility model has adopted circuit perforate design, make heat transferring medium can be uniformly from the upper and lower circuit reactor of coming in and going out;

3, reactor of the present utility model has reduced kinetic energy consumption, has saved running cost;

4, reactor of the present utility model adopts radially counter-boring techniques of traverse baffle, has effectively controlled the axial and radial temperature difference of inside reactor;

5, to adopt the liquid form of inner heat transferring medium be that cross-flow has a small amount of parallel-flow concurrently to reactor of the present utility model, improved the heat exchanger effectiveness of system;

6, reactor of the present utility model has improved the throughput of device.

Description of drawings:

Fig. 1 is that 50,000 tons of/year o-Xylols of the utility model are produced the structural representation of phthalic anhydride reactor group;

Fig. 2 is that 50,000 tons of/year o-Xylols are produced hot media flow schematic diagram in the following circuit of phthalic anhydride reactors;

Fig. 3 is that 50,000 tons of/year o-Xylols are produced hot media flow schematic diagram in the cocircuit of phthalic anhydride reactors;

Fig. 4 is that 50,000 tons of/year o-Xylols are produced fused salt cross-flow passes synoptic diagram in the phthalic anhydride reactor;

Fig. 5 is that 50,000 tons of/year o-Xylols are produced fused salt parallel-flow flow schematic diagram in the phthalic anhydride reactor;

Fig. 6 is that 50,000 tons of/year o-Xylols are produced circuit orifice plate deployed configuration synoptic diagram under the phthalic anhydride reactor;

Fig. 7 is that 50,000 tons of/year o-Xylols are produced phthalic anhydride reactor cocircuit orifice plate deployed configuration synoptic diagram.

Embodiment:

Structure referring to 1 couple of the utility model embodiment of accompanying drawing is further elaborated:

This calandria type fixed bed reactor comprises that upper cover bobbin carriage 1, upper tubesheet 2, housing 4, reaction tubes 5, lower tubesheet 8, lower cover bobbin carriage 9 constitute reactor body, housing 4 is provided with cocircuit 3 and following circuit 7, two cover recycle pump 11 and fused salt water coolers 12 are set respectively between cocircuit 3 and following circuit 7, have the hole that size does not wait on the housing 4 in described upper and lower circuit, decide the degree of uniformity of the heat transferring medium of inflow reactor by the size in design hole; Upper, middle and lower portion in the housing 4 is equipped with traverse baffle 6, on this traverse baffle 6 aperture is set.

Adopt the double pump circulating technology referring to Fig. 1 reactor of the present utility model, the import and export of two groups of fused salts are set on circuit, have measure-alike hole on reactor shell 4, the percentage of open area that covers hole outer cover plate 16 by design decides the degree of uniformity of the heat transferring medium of inflow reactor; During use, unstripped gas enters reaction tubes 5 in the reactor from vaporizer 15 through the top of reactor, and the beds by in managing reacts; Reaction process is emitted heat, and reaction heat reaches fused salt by reaction tubes, by circulation reaction heat is shifted out reactor by fused salt; Fused salt is squeezed into down circuit 7 by propeller pump 11, through the perforate equivalent on the reactor, radially enter between reaction tubes, takes away reaction heat, flows into cocircuit 3 again.Through the control of equilibrium valve, variable valve 13, behind supersalt water cooler 12, flow into circuit 7 down again from the cocircuit 3.Fused salt is axial cross-flow and has a small amount of parallel-flow concurrently and flow in reactor.Vapor superheater is connected on cocircuit 3 and the following circuit 7, and fused salt produces steam, takes heat away through heat exchange.Electric heater is connected on cocircuit 3 and the following circuit 7, uses when device drives to heat up or stop insulation.

Referring to Fig. 2, Fig. 3, Fig. 6, shown in Figure 7, fused salt enters the following circuit of reactor from pump, has measure-alike hole on the housing of circuit internal reaction device down, covers the percentage of open area difference of hole outer cover plate 16, fused salt flows between reactor tube by this hole equivalent radial, referring to circuit orifice plate deployed configuration synoptic diagram under Fig. 6.Have measure-alike hole on the housing of cocircuit internal reaction device, cover the percentage of open area difference of hole outer cover plate 16, fused salt flows to the reactor cocircuit by this hole equivalent radial, referring to Fig. 7 cocircuit orifice plate deployed configuration synoptic diagram.

Referring to shown in Figure 4, fused salt is behind following circuit inflow reactor, in the middle of flowing to uniformly earlier, by behind the following traverse baffle, begin again to flow, in the middle of flowing through behind the outer of traverse baffle to the reactor wall direction, change direction and flow to the center, behind last traverse baffle, flow to reactor wall uniformly from its center.

Referring to shown in Figure 5, fused salt uniformly in the process of intermediate flow, flows to the top behind following circuit inflow reactor, pass traverse baffle after, flow to reactor wall again uniformly.

It is that cross-flow has a small amount of parallel-flow concurrently that reactor of the present utility model adopts the liquid form of inner heat transferring medium, thereby has improved the heat exchanger effectiveness of system.

Claims

1. produce the fixed-bed reactor that 50,000 tons o-Xylol is produced phthalic anhydride per year for one kind, comprise upper cover bobbin carriage (1), upper tubesheet (2), housing (4), reaction tubes (5), lower tubesheet (8), lower cover bobbin carriage (9) constitutes reactor body, and adopt pump to circulate, it is characterized in that: described housing (4) is provided with cocircuit (3) and following circuit (7), two cover recycle pump (10) and fused salt water coolers (11) are set respectively between cocircuit (3) and following circuit (7), on described, have the hole that size equates on the housing (4) in the following circuit, be provided with outside the hole and cover the orifice plate (16) that flux does not wait; Fixed-bed reactor reaction tubes (5) specification is Φ 30 * 2.5 * 3700mm, and reaction tubes (5) quantity is 20000, housing (4) diameter 6300mm.

2. the o-Xylol that annual output according to claim 1 is 50,000 tons is produced the fixed-bed reactor of phthalic anhydride, it is characterized in that: the rule of arranging in the hole (17) of covering orifice plate is for to be reduced successively to the two side holes height by inlet mouth on the housing in the described cocircuit; The rule of arranging in the hole (17) of covering orifice plate is for to be increased successively to the two side holes height by the air outlet on the housing in the described circuit down.

3. the o-Xylol that annual output according to claim 1 and 2 is 50,000 tons is produced the fixed-bed reactor of phthalic anhydride, it is characterized in that: the upper, middle and lower portion in the described housing (4) is equipped with traverse baffle (6), and the pore size on this traverse baffle (6) does not wait.

4. the o-Xylol that annual output according to claim 3 is 50,000 tons is produced the fixed-bed reactor of phthalic anhydride, it is characterized in that: vaporizer (12) is set before the described reactor inlet, is connected with electric heater (13), vapor superheater (14), variable valve and equilibrium valve (15) on the reactor fused salt circuit.