CN103512313B - A kind of combined type moist material fluid bed superheat steam drying system - Google Patents

Abstract

The invention discloses a combined wet material fluidized bed superheated steam drying system. The existing drying system cannot realize the reasonable distribution of energy. In the present invention, the inlet and outlet of the casing-type screw feeder are respectively connected to the crusher and the pneumatic conveying bed, both ends of the pneumatic conveying bed are connected to the fluidized bed dryer, and the upper and lower ends of the fluidized bed dryer are respectively provided with regulating conduits and The discharge port and the two ends of the dust collector are respectively connected with the regulating duct and the sleeve type screw feeder, and the steam superheater is connected with the pneumatic conveying bed and the fluidized bed dryer through the fan. Both ends of the steam superheater are connected with a casing type screw feeder; the steam collector is arranged between the outer pipe of the screw feeder and the steam superheater. The invention can have selective drying time for materials with different particle sizes, and at the same time make full use of the condensation heat of the fluidized medium to reduce the drying cost.

Description

A combined wet material fluidized bed superheated steam drying system

technical field

The invention relates to a combined wet material fluidized bed superheated steam drying system, which belongs to the field of drying devices.

Background technique

With the development of my country's industry, a large number of industrial raw materials need to be dehydrated, and the drying devices widely used at present include fluidized bed dryers, drum dryers, rotary dryers, spray dryers, etc. The fluidized bed dryer has the advantages of large heat transfer area, intense heat transfer and rapid drying. Because the heat transfer medium and the material are not in direct contact with the indirect dryer, the drying process is safe and reliable, and it is especially suitable for materials with low ignition points.

The main problems of fluidized bed dryers widely used at present:

1. Due to the uneven size, water content and weight of the particles, small particles are easy to dry, but are easily blown by the wind, and large particles are heavy and difficult to dry. Different factors such as water content and drying speed cannot be taken into consideration in the drying process. , causing some particles to be overdried, and some to be incompletely dried, failing to achieve a reasonable distribution of energy.

2. The drying medium of the traditional fluidized bed dryer needs to be cooled outside the system, which will waste the energy of medium condensation outside the system, which is a waste of energy for the system. How to use this part of energy is the current need to consider.

Contents of the invention

The purpose of the present invention is to address the deficiencies of the prior art, to provide a combined wet material fluidized bed superheated steam drying system, so that it has selective drying time for materials with different particle sizes, and at the same time makes full use of the condensation heat of the fluidized medium, Reduce drying costs.

The technical scheme that the present invention adopts for solving its technical problem is as follows:

The invention includes a crusher, a casing type screw feeder, a pneumatic conveying bed, a fluidized bed dryer, a regulating duct, a first circulation fan, a dust collector, a steam pump, a steam superheater, a discharge port, and a second circulation Fan, third circulation fan, steam collector.

The outlet of the crusher is connected to the inner pipe of the sleeve-type screw feeder, and the outlet of the sleeve-type screw feeder is connected to the pneumatic conveying bed. The upper and lower ends of the pneumatic conveying bed are connected with the fluidized bed dryer. There is a discharge port on one side of the lower end of the fluidized bed dryer, and the upper end is connected with one end of the regulating conduit, and the length of the regulating conduit penetrating into the upper end of the fluidized bed dryer can be adjusted; The output port of the dust collector is connected with the second input port of the outer pipe of the casing screw feeder through the first circulating fan;

The steam superheater is connected to the lower end of the pneumatic conveying bed and the lower end of the fluidized bed dryer through the second circulation fan and the third circulation fan respectively, and at the same time, the steam superheater is connected to one end of the inner pipeline of the fluidized bed dryer The other end of the inner pipe is connected with the first input port of the outer pipe of the casing screw feeder.

The steam water collector is arranged between the outer pipe of the screw feeder and the steam superheater, and the two input ports of the steam water collector are respectively connected with the first output port and the second output port of the outer pipe of the casing screw feeder , one output end of the steam collector is connected with the input end of the steam superheater.

The working process of the present invention is as follows:

When in use, after the crusher crushes the material, it is conveyed into the pneumatic conveying bed by the paddle in the inner tube of the casing screw feeder, and the small particle material is brought into the fluidized bed dryer through the upper end of the pneumatic conveying bed. In the process, the large particle material overflows into the fluidized bed dryer through the lower end of the pneumatic conveying bed, and the large particle material is fluidized and dried in the fluidized bed dryer, and finally discharged from the outlet at the lower end of the fluidized bed dryer. The small particle material enters the dust collector through the regulating duct at the upper end of the fluidized bed dryer and is collected in it. At the same time, the steam in it is introduced into the outer pipe of the casing screw feeder through the first circulating fan.

The steam pump injects the superheated steam generated by the steam superheater from one end of the inner pipe of the fluidized bed dryer to maintain the temperature of the fluidized bed dryer and dry the large particle materials; the other end of the inner pipe comes out The steam also enters the outer pipe of the casing screw feeder, and the mixture of steam and water cooled in the casing screw feeder enters through the second output port of the outer pipe of the casing screw feeder. In the steam-water collector, after the steam-water collector removes part of the liquid in the mixture, the mixture of remaining steam and water is sent to the steam superheater for superheating, forming a cycle.

The small particle material and the large particle material are divided according to actual needs, and are mainly determined by the flow rate of the third circulation fan. If the material enters the fluidized bed dryer, the material is a small particle material; otherwise, the material is brought into the fluidized bed dryer through its lower end, and the material is a large particle material.

In order to facilitate the control of the fineness and drying degree of the particles coming out from the upper end of the fluidized bed dryer, the depth of the conduit inserted into the fluidized bed dryer can be adjusted.

The beneficial effects of the present invention are as follows:

In the present invention, the upper end and the lower end of the pneumatic conveying bed and the fluidized bed drier are connected, so that materials with different particle diameters can enter the fluidized bed drier from different places. At the same time, it only needs to replenish water at the initial stage of operation, and the added water can always circulate in the system without additional replenishment.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

In the figure: crusher 1, casing screw feeder 2, pneumatic conveying bed 3, fluidized bed dryer 4, regulating duct 5, first circulation fan 6, dust collector 7, steam pump 8, steam superheater 9. Discharge port 10, second circulation fan 11, third circulation fan 12, steam water collector 13.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing:

As shown in Figure 1, a combined fluidized bed superheated steam drying system for wet materials includes a crusher 1, a casing screw feeder 2, a pneumatic conveying bed 3, a fluidized bed dryer 4, and an adjusting conduit 5. First circulating fan 6, dust collector 7, steam pump 8, steam superheater 9, discharge port 10, second circulating fan 11, third circulating fan 12, steam water collector 13.

The outlet of the crusher 1 is connected to the inner pipe of the casing screw feeder 2, and the outlet of the casing screw feeder 2 is connected to the pneumatic conveying bed 3, and the upper and lower ends of the pneumatic conveying bed 3 are dried with the fluidized bed. The device 4 is connected, and one side of the lower end of the fluidized bed drier has a discharge port 10, and the upper end is connected with one end of the regulating conduit 5, and the length of the regulating conduit 5 deep into the upper end of the fluidized bed drier can be adjusted; the regulating conduit 5 The other end of the dust collector is connected to the input port of the dust collector 7, and the output port of the dust collector 7 is connected to the second input port of the outer pipe of the sleeve type screw feeder 2 through the first circulating fan 6;

The steam superheater 9 is connected to the lower end of the pneumatically conveyed bed 3 and the lower end of the fluidized bed dryer 4 through the second circulation fan 11 and the third circulation fan 12 respectively. One end of the inner pipe of the drier 4 is connected, and the other end of the inner pipe is connected with the first input port of the outer pipe of the casing screw feeder 2 .

The steam water collector 13 is arranged between the outer pipe of the screw feeder 2 and the steam superheater 9, and the two input ports of the steam water collector 13 are respectively connected with the first output port and the outer pipe of the sleeve type screw feeder 2. The second output port is connected, and one output end of the steam-water collector 13 is connected with the input end of the steam superheater 9 .

The working process of the present invention is as follows:

When in use, after the crusher 1 crushes the material, it is transported into the pneumatic conveying bed 3 by the paddles in the inner tube of the casing screw feeder 2, and the small particle material is brought into the flow through the upper end of the pneumatic conveying bed 3 In the fluidized bed dryer 4, the large particle material overflows into the fluidized bed dryer 4 through the lower end of the pneumatic conveying bed 3, and the large particle material is fluidized and dried in the fluidized bed dryer 4, and finally dried from the fluidized bed The outlet 10 at the lower end of the fluidized bed dryer 4 is discharged, and the small particle material enters the dust collector 7 through the regulating duct 5 at the upper end of the fluidized bed dryer 4 and collects the material therein, and the steam in it is introduced through the first circulating fan 6 In the outer pipeline of casing type screw feeder 2.

The steam pump 8 pumps the superheated steam generated by the steam superheater 9 from one end of the inner pipeline of the fluidized bed dryer 4 to maintain the temperature of the fluidized bed dryer 4 and the drying of large particle materials; the inner pipeline The steam from the other end of the casing also enters the outer pipe of the casing screw feeder 2, and the mixture of steam and water cooled in the casing screw feeder 2 passes through the casing screw feeder 2. The second output port of the pipeline enters the steam-water collector 13, and after the steam-water collector 13 removes part of the liquid in the mixture, the mixture of the remaining steam and water is sent to the steam superheater 9 for superheating, forming a cycle.

The small particle material and the large particle material are divided according to actual needs, mainly determined by the flow rate from the third circulation fan 12, if the superheated steam after the third circulation fan 12 can pass the material in the pneumatic conveying bed 3 through If the upper end is brought into the fluidized bed dryer 4, the material is a small particle material; otherwise, the material is brought into the fluidized bed dryer 4 through its lower end, and the material is a large particle material.

In order to control the fineness and degree of drying of the particles coming out from the upper end of the fluidized bed dryer 4, the depth of the regulating conduit 5 inserted in the fluidized bed dryer can be adjusted.

Claims (2)

1. A combined wet material fluidized bed superheated steam drying system, characterized in that it includes a crusher, a casing type screw feeder, a pneumatic conveying bed, a fluidized bed dryer, a regulating conduit, a first circulating fan, a set Dust collector, steam pump, steam superheater, second circulation fan, third circulation fan, steam water collector, the outlet of the crusher is connected to the inner pipe of the casing screw feeder, and the outlet of the casing screw feeder is connected Pneumatic conveying bed, the upper and lower ends of the pneumatic conveying bed are connected with the fluidized bed dryer, the lower end of the fluidized bed dryer has a discharge port, the upper end is connected with one end of the regulating conduit, and the regulating conduit The length of the upper end of the in-depth fluidized bed dryer can be adjusted; the other end of the adjustment conduit is connected to the input port of the dust collector, and the output port of the dust collector passes through the connection between the first circulating fan and the outer pipe of the casing screw feeder. The second input port is connected; the steam superheater is connected to the lower end of the fluidized bed dryer through the second circulation fan, and is connected to the lower end of the pneumatic conveying bed through the third circulation fan; at the same time, the steam superheater is connected to the fluidized bed dryer through the steam pump. One end of the inner pipe of the chemical bed dryer is connected, and the other end of the inner pipe is connected with the first input port of the outer pipe of the casing type screw feeder; the steam collector is arranged on the outer pipe of the screw feeder and the steam superheater In between, the two input ports of the steam water collector are respectively connected with the first output port and the second output port of the outer pipe of the casing screw feeder, and one output port of the steam water collector is connected with the input port of the steam superheater connect. 2. A combined wet material fluidized bed superheated steam drying system as claimed in claim 1, It is characterized in that the length of the adjusting conduit penetrating into the upper end of the fluidized bed drier can be adjusted, and the fineness and drying degree of the particles can be controlled by adjusting the length of the conduit penetrating into the upper end of the fluidized bed drier.