CN2305244Y

CN2305244Y - Fluidized bed with high effective bubble breaking member

Info

Publication number: CN2305244Y
Application number: CN 97224187
Authority: CN
Inventors: 刘文国; 沈秋钟; 申亚江; 武三喜; 刘景立; 于祥生; 吕国民
Original assignee: Shijiazhuang City Chemical Plant No2
Current assignee: Shijiazhuang City Chemical Plant No2
Priority date: 1997-08-15
Filing date: 1997-08-15
Publication date: 1999-01-27
Anticipated expiration: 2007-08-15

Abstract

The utility model relates to a fluidized bed with a high effective bubble breaking member. The lower part of a casing is provided with a gas inlet, a gas distributing plate and a feeding device, the upper side of the distributing plate is solid granular catalyst and is provided with a multi-layer horizontal baffle plate member, the upper part of the casing is provided with a gas solid separator and a gas product outlet, and a thick phase zone is suspended with a plurality of chains passing through the multi-layer horizontal baffle plate. The utility model has the advantages of small member space, easy construction, high gas solid contacting effect, good fluidizing quality and high production capacity, effectively reduces the diameters of bubbles and is suitable for distributing wide granularity, and because the fluidized bed with high effective bubble breaking member is additionally provided with a multi-rotation horizontal guiding rotating net, the utility model has better breaking effect.

Description

Fluid bed with efficiency crushing bubble member

The utility model relates to the used device technique field of use physico-chemical process under fluid and the solid particle situation.

In the bed inside of fluid bed, most of solid particle is in the emulsification mutually, and emulsification is the intensive gas-solid mixture of a kind of solid phase mutually.Experiment is pointed out, even the critical fluidizing gas velocity of gas speed ratio is much bigger, the gas speed in emulsification mutually is also substantially near critical fludization velocity.Therefore, surpass the excess gas of critical gas velocity, almost all rise by bed with bubble form.The change of bed expansion ratio is the result that bubble diameter changes.Therefore, setting has broken and limits the member that bubble becomes big function in bed, and control and minimizing bubble diameter can realize improving gas-solid contact effect, improve the purpose of fluidization quality.In the fluid bed of China's naphthalene oxidation system phthalic anhydride, often adopt the control of nanubrium formula member and horizontal baffle member and reduce bubble.But nanubrium formula member spacing is subjected to the engineering construction condition restriction, can not be too little, and therefore, effectively bubble diameter is bigger between member, and increases with the static height of bed and operating gas velocity.So adopt this member, fluidized bed layer height and operating gas velocity are all lower, therefore, the device capability raising is restricted.Horizontal baffle is that air pocket is divided into the bar shaped bubble, and the bubble diameter after the recovery is still bigger, and the bubble crushing effect is also undesirable.

The purpose of this utility model provides a kind of fluid bed with efficiency crushing bubble member, it adopts and hangs chain member replacement vertical tube, thereby make member spacing little, easily construction, can effectively reduce effective bubble diameter, improve gas-solid contact effect, improve fluidization quality, help improving production capacity and product yield, applied range.Revolve netted deflector apron as horizontal baffle being changed into level, effect is better more.

The utility model is achieved in that a kind of fluid bed with efficiency crushing bubble member, it is characterized in that being provided with gas access and gas distribution grid in the bottom of reactor shell, feed arrangement, on distribution grid, be the solid granulates catalyst, and be provided with multilayer horizontal baffle member that top is provided with gas-solid separator and gaseous product outlet, separator is provided with down dipleg, at the solid space of concentrated phase area multilayer horizontal baffle member, pass the chain cylindrical void on the horizontal baffle member, be hung with many chains.

Be preferably in down bottom, dipleg exit concentrated phase reaction zone, be hung with many chains,, also be hung with many chains at following top, dipleg exit concentrated phase reaction zone.The chain stripe pitch is littler, and cutting is clashed into the bubble crushing effect better, and the chain stripe pitch is 50mm-200mm.

For bubble is further reduced, also horizontal baffle can be improved, the employing level is revolved guiding more and revolved net, and it is configured to: baffle plate is for constituting the little shutter assembly of 2 above pivots, and each little shutter is provided with the many piece transverse slats vertical with guide vane.Preferably the grid of shutter guide vane and transverse slat composition is of a size of 10mm-50mm.

Revolve the net collocation better for making chain and level revolve guiding, effect is better, can be equipped with a chain in the junction of per two little shutter adjacents and 4 little shutters more.

The utility model has the advantages that: owing to adopt the equal part structure of chain, the chain stripe pitch is little, and easily construction easily with the bubble cutting, simultaneously, because chain has the effect of radially wobbling at work, more helps bubble crushing, is difficult for making bubble to grow up.The bump bubble crushing, the coalescence trend of growing up when bubble rises is effectively suppressed.Thereby can improve gas-solid contact effect, improve fluidization quality, improve the yield of purpose product.It is less influenced by bed height and gas speed, helps improving production capacity, is suitable for wide size distribution, applied range.Owing to revolve the effect that guiding is revolved net more, make air pocket easily be become numerous isometrical minute bubbles, and produce spiral rising thrust by branch, more help the performance of chain swinging bump fragmentation.When particularly the bed granularity is tending towards refinement, still can adopt higher operating gas velocity.Can be used for naphthalene oxidation system phthalic anhydride fluid bed and other fluid beds.

Be further described below in conjunction with embodiment and accompanying drawing, but not as to qualification of the present utility model.

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is that level is revolved the structural representation that guiding is revolved net more.

Fig. 3 is partial enlarged drawing that revolves among Fig. 2.

Fig. 4 is the A-A profile among Fig. 3.

Among Fig. 1,1 is air intake, 2 is gas distribution grid, 3 is the material gasification spray gun, and chain vertical member 4 revolves the space that chain cylindrical void on the net 5 is suspended on reaction zone by revolving guiding more, and 6 is the concentrated phase area waste heat boiler, 7 be gas-solid separator 9, following dipleg, 8 are dilute phase reaction waste heat boiler, and 10 is housing, and 11 is pressure regulator.Primary cyclone is two inlets, to reduce wear, increases the service life.

Among Fig. 3,12 is the chain vertical member, and 13 is heat exchanger tube.

Among Fig. 4,14 is little louver board, and 15 for dentation supports transverse slat, can form many sub-boxes, is difficult for thermal deformation, and effectively cuts apart bubble.The blade guide plate is horizontal by 30-60 °, and 45 ° preferable.

With this device naphthalene oxidation system phthalic anhydride, catalyst average diameter 150 μ m, wherein＜53 μ m accounts for 3.6%, adopt chain vertical member and level to revolve to lead more revolve net after, catalyst average diameter 96 μ m, wherein＜53 μ m accounts for 19.86%.The phthalic anhydride recovery rate improves, and has improved economic benefit, and effect is preferable.

Claims

1, a kind of fluid bed with efficiency crushing bubble member, it is characterized in that being provided with gas access and gas distribution grid in the bottom of reactor shell, feed arrangement, on distribution grid, be the solid granulates catalyst, and be provided with multilayer horizontal baffle member that top is provided with gas-solid separator and gaseous product outlet, separator is provided with down dipleg, at the solid space of concentrated phase area multilayer horizontal baffle member, pass the chain cylindrical void on the horizontal baffle member, be hung with many chains.

2, fluid bed according to claim 1 is characterized in that being hung with many chains at following bottom, dipleg exit concentrated phase reaction zone, at following top, dipleg exit concentrated phase reaction zone, also is hung with many chains.

3, fluid bed according to claim 2 is characterized in that the chain stripe pitch is 50-200mm.

4, according to claim 1,2 or 3 described fluid beds, it is characterized in that the horizontal baffle member is that level is revolved guiding more and revolved net, it is configured to: baffle plate is for constituting the little shutter assembly of 2 above pivots, and each little shutter is provided with the many piece transverse slats vertical with guide vane.

5, fluid bed according to claim 4 is characterized in that transverse slat is the dentation transverse slat.

6, fluid bed according to claim 5 is characterized in that every two adjacent little shutter guide vanes are orthogonal.

7, fluid bed according to claim 6 is characterized in that the grid that guide vane and transverse slat are formed on the little shutter is of a size of 10-50mm.

8, fluid bed according to claim 7 is characterized in that the junction of each little shutter adjacent and 4 little shutters is equipped with a chain.