CN201008786Y

CN201008786Y - Fixed bed reactor for producing by benzene method capable of producing 20,000 tons per year

Info

Publication number: CN201008786Y
Application number: CNU2006201359262U
Authority: CN
Inventors: 胡靖文; 邰向阳; 董秋季; 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: 2006-10-11
Filing date: 2006-10-11
Publication date: 2008-01-23
Anticipated expiration: 2016-10-11

Abstract

The utility model relates to a chemical reactor group which produces maleic anhydride with benzene as raw material. The annual maleic anhydride production capacity of the utility model is 20,000 tons. In the prior art, the largest annual production capacity of a single maleic anhydride production unit using benzene as raw material is 10,000 tons; with one salt-melting circulating pump for transiting heat, the heat is centralized and difficult to transit outside; as a result, the prior maleic anhydride production unit using benzene as raw material consumes much energy to yield one unit of output, so the effective utilization rate is low and the operation cost is high. According to the structure of the utility model, a pump is arranged on the main body to circulate heat; an upper loop road and a lower loop road are provided on a shell body; two sets of circulation pumps and salt-melting cooler are respectively provided between the upper loop road and the lower loop road, thus the reactor can transite heat more uniformly; the kinetic energy use is reduced and the running cost is saved.

Description

Produce the fixed bed reactors of 20,000 tons benzene method production cis-butenedioic anhydride per year

Technical field:

It is that raw material carries out the chemical reactor group that cis-butenedioic anhydride is produced that the utility model relates to a kind of benzene that adopts, and its yearly productive capacity is 20,000 tons of cis-butenedioic anhydrides.

Technical background:

In the prior art, be that raw material carries out the device that cis-butenedioic anhydride is produced with benzene, the separate unit production capacity maximum of its device all at 10,000 tons/year, its molten salt circulating pump that moves hot usefulness all is to adopt one to carry out.There is following problem in 10,000 tons of/year set of reactors: 1, Zhuan Zhi separate unit production capacity 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 operating 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 benzene method of 20,000 tons of low annual outputs of energy consumption produces the fixed bed reactors of cis-butenedioic anhydride.

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

A kind of benzene method of producing 20000 tons per year is produced the fixed bed reactors of cis-butenedioic anhydride, comprise upper cover bobbin carriage 1, upper perforated plate 2, housing 4, reaction tube 5, lower perforated plate 8, low head 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 circulating pump 10 and fused salt 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.

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 air inlet 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 gas outlet on the housing in the described circuit down.

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

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

Described reaction tube 5 specifications are Φ 25 * 2.5 * 3700mm, and reaction tube 5 quantity are 24000, housing 4 diameter 5700mm.

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 operating cost;

4, reactor of the present utility model adopts radially counter-boring techniques of deflection plate, 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 concurrent 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 production capacity of device.

Description of drawings:

Fig. 1 is the structural representation of 20,000 tons of/year benzene method maleic anhydride set of reactors of the utility model;

Fig. 2 is a hot media flow schematic diagram in the following circuit of 20,000 tons of/year benzene method maleic anhydride reactors;

Fig. 3 is a hot media flow schematic diagram in the cocircuit of 20,000 tons of/year benzene method maleic anhydride reactors;

Fig. 4 is a fused salt cross-flow passes schematic diagram in 20,000 tons of/year benzene method maleic anhydride reactors;

Fig. 5 is a fused salt concurrent flow flow schematic diagram in 20,000 tons of/year benzene method maleic anhydride reactors;

Fig. 6 is a circuit orifice plate deployed configuration schematic diagram under 20,000 tons of/year benzene method maleic anhydride reactors;

Fig. 7 is 20,000 tons of/year benzene method maleic anhydride reactor cocircuit orifice plate deployed configuration schematic diagrames.

The specific 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 perforated plate 2, housing 4, reaction tube 5, lower perforated plate 8, low head bobbin carriage 9 constitute reactor body, housing 4 is provided with cocircuit 3 and following circuit 7, two cover circulating pump 11 and fused salt 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 uniformity coefficient 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 deflection plate 6, on this deflection plate 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 percent opening that covers hole outer cover plate 16 by design decides the uniformity coefficient of the heat transferring medium of inflow reactor; During use, unstripped gas enters reaction tube 5 in the reactor from vaporizer 15 through the top of reactor, and the beds by in managing reacts; Course of reaction is emitted heat, and reaction heat reaches fused salt by reaction tube, by circulation reaction heat is shifted out reactor by fused salt; Fused salt is squeezed into down circuit 7 by axial-flow pump 11, through the perforate equivalent on the reactor, radially enter between reaction tube, takes away reaction heat, flows into cocircuit 3 again.Through the control of balanced valve, control valve 13, behind supersalt cooler 12, flow into circuit 7 down again from the cocircuit 3.Fused salt is axial cross-flow and has a small amount of concurrent flow concurrently and flow in reactor.Steam 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 percent opening difference of hole outer cover plate 16, fused salt is by this hole equivalent flowing between reactor tube radially, referring to circuit orifice plate deployed configuration schematic diagram under Fig. 6.On the housing of cocircuit internal reaction device, have measure-alike hole, cover the percent opening difference of hole outer cover plate 16, fused salt by this hole equivalent radially flow to the reactor cocircuit, referring to Fig. 7 cocircuit orifice plate deployed configuration schematic 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 deflection plate, begin again to flow, in the middle of flowing through behind the outer of deflection plate to the reactor wall direction, change direction and flow to the center, behind last deflection plate, 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 deflection plate after, flow to reactor wall again uniformly.

It is that cross-flow has a small amount of concurrent 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 reactors that 20,000 tons benzene method is produced cis-butenedioic anhydride per year for one kind, comprise upper cover bobbin carriage (1), upper perforated plate (2), housing (4), reaction tube (5), lower perforated plate (8), low head 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 circulating pump (10) and fused salt 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.

2. the benzene method that annual output according to claim 1 is 20,000 tons is produced the fixed bed reactors of cis-butenedioic 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 air inlet 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 gas outlet on the housing in the described circuit down.

3. the benzene method that annual output according to claim 1 and 2 is 20,000 tons is produced the fixed bed reactors of cis-butenedioic anhydride, it is characterized in that: the upper, middle and lower portion in the described housing (4) is equipped with deflection plate (6), and the pore size on this deflection plate (6) does not wait.

4. the benzene method that annual output according to claim 3 is 20,000 tons is produced the fixed bed reactors of cis-butenedioic anhydride, it is characterized in that: vaporizer (12) is set before the described reactor inlet, is connected with electric heater (13), steam superheater (14), control valve and balanced valve (15) on the reactor fused salt circuit.

5. the benzene method that annual output according to claim 4 is 20,000 tons is produced the fixed bed reactors of cis-butenedioic anhydride, and it is characterized in that: described reaction tube (5) specification is Φ 25 * 2.5 * 3700mm, and reaction tube (5) quantity is 24000, housing (4) diameter 5700mm.