CN101140135B - Drying mechanism in basket centrifuge - Google Patents

Abstract

The invention discloses a drying device for a filtering centrifuge, which can implement heating and vaporization for ''non-infiltration filtrate'' in filter cake in order to remove the ''non-infiltration filtrate''; the invention comprises a base, wherein the base is movably provided with a main shaft, the main shaft is across arranged in a rotary drum and fixed with the rotary drum bottom, the top of the rotary drum is provided with a liquid-retaining plate, the base is also provided with a machine shell, the top of the machine shell is provided with a machine cover, a feeding pipe is across arranged in the liquid-retaining plate and the machine cover, and the lower side part of the machine shell is opened with a liquid discharge air outlet along the tangential direction; the upper part of the rotary drum bottom of the main shaft is provided with a plurality of impellers of a forward-bent blade, the inlet of the impeller is dead against the outlet of the feeding pipe, the side wall of the feeding pipe is provided with an air inlet pipe communicated with the feeding pipe, and the air inlet pipe is communicated with the outside through an air preheater. The drying device introduces the heated air into the impeller to pressurize in order to result in that the air passes through the filter cake layer and implements the heating and vaporization for residual liquid in the filter cake layer until the residual liquid is removed, which greatly improves the product quality.

Description

Drying device in a kind of perforated wall centrifuge

Technical field

The present invention relates to perforated wall centrifuge, refer more particularly to the drying device in the perforated wall centrifuge.

Background technology

Though centrifugal filtration all is to utilize centrifugal force that suspension material liquid is carried out process of solid-liquid separation, but in the centrifuge of various different structures, the form that exists of filter cake is not quite similar, filter cake in 3-foot, top suspension and the scraper type centrifuge is a fixed bed, filter cake in piston material pushing formula, screw unloading formula and the various vibrating centrifuge is a mobile layer, but no matter it is in the fixed bed state, still be in the filter cake of mobile layer state or different thickness, centrifugal filtration all is to carry out in the mode that generates filter cake.Many basic problems in the cake filtration are all explained and are deduced with the diafiltration opinion.Viewpoint according to the diafiltration opinion, the liquid that retains in the filter cake stratum granulosum has three kinds, be the liquid that is full of in macropore, hole and the clearance space, " capillarity liquid " and " can not percolate ", retaining liquid for preceding two kinds can remove it by strengthening centrifugal force or prolonging the drying time method from filter cake, and for " can not percolate ", because it is present in each granule interior or is present in outer surface and does not have in the thin and dark hole of direct channel, makes it can not remove by the method for centrifugal force by gravity.And drying is a kind of simple method that " can not percolate " in the filter cake can be removed.At present, normally in the course of conveying of filter cake, introduce thermal current it is carried out heat drying, for example: the link-suspended basket centrifuge of air-flow discharging, rely on blower fan the filter cake of the hot-air sent into and sucking-off to be formed the gas flow loop of a sealing, the filter cake of sucking-off carries out pneumatic conveying drying in the process of carrying, obvious this mode has significant limitation, filter cake must be in rarefaction could be by the air-flow sucking-off, in the pneumatic conveying drying process, particle collides mutually, fragmentation, impact for the quality of filter cake, and the energy consumption of whole system is big; And for example: vertical piston top discharging link-suspended basket centrifuge, in the rotary drum periphery blade is set, in revolution, produce a suction, the hot-air in the ring-type heating clamber of top is caused the rotary drum upper edge; And here contact, mix with the filter cake that piston is released, under action of centrifugal force, filter cake and Air mixing stream tangentially drain into the outer gathering-device of machine, and is the same with air-flow discharging link-suspended basket centrifuge, also is in course of conveying filter cake to be carried out pneumatic conveying drying.Generally speaking, above-mentioned drying mode complex structure, energy consumption big, bigger limitation arranged.

Summary of the invention

Technical problem to be solved by this invention is: provide a kind of can be to " can not percolate " in the filter cake thereby heating makes it to vaporize the drying device in the perforated wall centrifuge that is removed.

For solving the problems of the technologies described above, the technical solution used in the present invention is: the drying device in a kind of perforated wall centrifuge, comprise: base, be movably set with main shaft on the base, main shaft is located in the rotary drum and with at the bottom of the rotary drum and fixes, and the top of rotary drum is provided with lip ring, also be provided with casing on the base, the top of casing is provided with cover, is equipped with feed pipe in lip ring and the cover, and the casing following side is provided with the discharge opeing air outlet of tangentially offering; Be provided with impeller above at the bottom of being positioned at rotary drum on the described main shaft with a plurality of forward-curved blades, the inlet of impeller faces the outlet of feed pipe, the sidewall of feed pipe is provided with the air inlet pipe that communicates with feed pipe, and air inlet pipe communicates with the external world by air preheater.

The invention has the beneficial effects as follows: after in rotary drum, forming filter cake, with the fast together in the same way impeller that rotates of rotary drum, in rotation, constantly discharge air, form certain negative pressure in the impeller center, so the air of air inlet pipe after with the air preheater preheating introduced rotary drum continuously.Be accelerated owing to enter when the preheated air of impeller flows between blade, make the mechanical energy of centrifuge be converted to the kinetic energy of air, formation is higher than atmospheric blast, order about preheated air and pass cake layer, preheated air constantly to filter cake heat, dry, vaporization, make " can not percolate " in the filter cake constantly be removed, the filter cake liquid content that obtains like this be lower.

Description of drawings

Fig. 1 is that the present invention is applied in the structural representation in the perforated wall centrifuge;

Among the figure: 1, feed pipe, 2, impeller, 21, the cloth vent passages, 3, rotary drum, 31, rotary drum body, 32, at the bottom of the rotary drum, 4, lip ring, 5, air preheater, 6, casing, 61, cover, 7, the discharge opeing air outlet, 8, main shaft, 9, base, 10, motor, 11, doctor blade device, 12, cake layer, 13, air inlet pipe.

The specific embodiment

Below in conjunction with accompanying drawing, describe specific embodiments of the present invention in detail.

As shown in Figure 1, drying device in the perforated wall centrifuge of the present invention, comprise: base 9, be movably set with main shaft 8 by bearing and bearing block on the base 9, main shaft 8 be located in the rotary drum 3 and with 32 fix at the bottom of the rotary drum, the top of rotary drum 3 is provided with lip ring 4, also be provided with casing 6 on the base 9, the top of casing 6 is provided with cover 61, is equipped with feed pipe 1 in lip ring 4 and the cover 61, and casing 6 following sides are provided with the discharge opeing air outlet of tangentially offering 7; At the bottom of being positioned at rotary drum on the described main shaft 8 32 above be provided with impeller 2 with a plurality of forward-curved blades, it between adjacent forward-curved blade cloth vent passages 21, the inlet of impeller 2 faces and is arranged on the casing 6, is used for the outlet to the feed pipe 1 of rotary drum 3 charging air intakes, the sidewall of feed pipe 1 is provided with the air inlet pipe 13 that communicates with feed pipe 1, and air inlet pipe 13 communicates with the external world by air preheater 5.

The course of work of the present invention is: during centrifuge work, by motor 10 drive shaft 8, drive at the bottom of the rotary drum 32 and impeller 2 rotations again, suspension enters into rotary drum 3 from feed pipe 1, and be introduced into the cloth vent passages 21 of impeller 2, suspension is quickened by forward-curved blade, and in the exit of forward-curved blade acquisition maximal rate, like this, suspension spills cloth to the inwall of rotary drum body 31 time, almost the linear velocity with rotary drum 3 equates, make cloth more even, and reduced vibration, under action of centrifugal force, most of liquid phase is passed the filter opening of filter medium and rotary drum body 31, be pooled to and be positioned at the discharge opeing air outlet 7 that casing 6 downsides are tangentially offered, and from discharge opeing air outlet 7 discharge centrifuges, solid phase then is trapped in the rotary drum 3 by the filter medium of rotary drum body 31 inboards, form uniform cake layer 12; After suspension in the impeller 2 and air are discharged under action of centrifugal force, be formed centrally negative pressuren zone in the impeller 2, the air of outside is through after pre-hot heater 5 preheatings, constantly be inhaled in the impeller 2 through feed pipe 1 by air inlet pipe 13, forward-curved blade drives the hot-air that sucks and rotates together, constantly quickens, and like this, the mechanical energy of centrifuge just is converted to the kinetic energy of air, make air after process impeller 2, energy increases, forms blast; When forward-curved blade can be at less impeller outer diameter or than the slow-speed of revolution, obtain higher blast.The casing 6 of centrifuge communicates with atmosphere, and the filter opening that is provided with in the rotary drum body 31 makes the interior outside of rotary drum body 31 communicate, so just make that the inboard of rotary drum body 31 is that the outside of cake layer 12 also communicates with atmosphere, that is: the outside of cake layer 12 is atmospheric pressure, and cake layer 12 inboards are blast that impeller 2 produces, so just between cake layer 12 inside and outside both sides, form pressure reduction, order about preheated air and constantly pass cake layer 12.Viewpoint according to filter cake diafiltration opinion, remain in the cake layer 12 what is called that can not be removed by centrifugal force " can not percolate ", constantly passed preheated air heating, the vaporization of cake layer 12, from cake layer 12, removed, so just can be obtained the lower filter cake of liquid content.The preheated air that passes cake layer 12 collects in the casing, outside the tangential discharge opeing air outlet 7 discharge machines that meet gas flow situation in the machine.Reach the liquid content of expection when filter cake after, filter cake is drawn off from the centrifuge bottom by doctor blade device 11.

In sum, be provided with drying device of the present invention and do not establish additional air inducing equipment, but will suck in the rotary drum 3 through the air after the preheating by the impeller 2 of rotation, and the blast that the impeller 2 of rotation produces orders about preheated air again and passes cake layer 12, to cake layer 12 heat, dry and vaporization, thereby " can percolate " in the cake layer 12 do not removed, thereby improved the effect that dries greatly; Simultaneously also improved cloth and washing situation, made the filter cake liquid content lower.

Claims (1)

1. the drying device in the perforated wall centrifuge, comprise: base, be movably set with main shaft on the base, main shaft is located in the rotary drum and with at the bottom of the rotary drum and fixes, the top of rotary drum is provided with lip ring, also is provided with casing on the base, and the top of casing is provided with cover, be equipped with feed pipe in lip ring and the cover, the casing following side is provided with the discharge opeing air outlet of tangentially offering; It is characterized in that: be provided with impeller above at the bottom of being positioned at rotary drum on the described main shaft with a plurality of forward-curved blades, the inlet of impeller faces the outlet of feed pipe, the sidewall of feed pipe is provided with the air inlet pipe that communicates with feed pipe, and air inlet pipe communicates with the external world by air preheater.