CN201207913Y

CN201207913Y - Tobacco pneumatic conveying dryer

Info

Publication number: CN201207913Y
Application number: CNU2008201478720U
Authority: CN
Inventors: 席年生; 林玉红; 孔臻; 张大波; 邓国栋; 姚光明; 常慧英
Original assignee: Zhengzhou Tobacco Research Institute of CNTC
Current assignee: Zhengzhou Tobacco Research Institute of CNTC
Priority date: 2008-07-08
Filing date: 2008-07-08
Publication date: 2009-03-18
Anticipated expiration: 2018-07-08

Abstract

The utility model relates to air current tobacco drying equipment which comprises a drying pipe provided with rectangular circular structure and positioned on a rack in a vertical manner, heat exchangers (7) arranged among right vertical pipes (8) forming the drying pipe, steam inlets (6) formed on a pipeline above the heat exchangers in sequence, a blower (4) communicated with the pipe cavity, blanking machines (2) arranged on upper transverse pipes (9) forming the drying pipe, and cut tobacco inlets (1) formed at the bent positions of a left vertical pipe (10) forming the drying pipe and lower transverse pipes (11) of the drying pipe. The air current tobacco drying equipment is characterized in that the left vertical pipe (10) forming the drying pipe is composed of three pipes with change of diameters which turns large from small and then turns small from large. By using the air current tobacco drying equipment, the contact area between the air current and the material, the contact times and the contact time can be obviously increased, the heat transfer efficiency and the mass transfer efficiency are enhanced, and both the energy consumption and the processing quality are obviously improved.

Description

A kind of tobacco pneumatic conveying dryer

Technical field

The utility model relates to the process technology that grows tobacco, and relates to a kind of tobacco pneumatic conveying dryer specifically.

Background technology

At present, the pneumatic drying of cut tobacco technology is extensively used at tobacco business, from the process principle analysis, to dry object Ye Sier speech, the HDT method of the HXD pneumatic conveying drying and the low humidity high temperature of high humidity low temperature is arranged.These two kinds of forms all are in the identical drying tube of sectional area, utilize acceleration and movement at the uniform velocity between material and the air-flow to carry out heat and mass, according to the pneumatic conveying drying principle analysis, when adopting this type of pneumatic conveying drying, only be higher, at remaining 2/3rds constant speed motor segments at a bit of thermal efficiency of accelerated motion, heat exchanger effectiveness is extremely low, so directly cause whole dry run heat exchanger effectiveness on the low side, outlet material moisture is inhomogeneous simultaneously, and the moisture standards deviation surpasses ± 0.17%.

Summary of the invention

The purpose of this utility model provides a kind of tobacco pneumatic conveying dryer at existing weak point in the above-mentioned prior art just.This equipment mainly utilizes the highest principle of the air-flow impulse drying thermal efficiency, with drying tube by the isometrical dryer section (promptly utilizing the version of Venturi tube) that changes little, large and small three sections different tube diameters into, pass through reasonable computation, guaranteeing under the prerequisite that material evenly passes through, realize the variable motion of the acceleration-deceleration-acceleration between material and the air-flow, because the multistage speed that forms between material and the air-flow is poor, reaches the impulse drying between two sections.

The purpose of this utility model can realize by following technique measures:

Tobacco pneumatic conveying dryer of the present utility model comprises the drying tube that is placed in the square loop configuration on the frame in the mode of vertical setting, be arranged on heat exchanger between the right side standpipe of forming drying tube, be successively set on steam inlet on the pipeline of heat exchanger top and the blower fan that is connected with tube chamber, and be arranged on the feeder between the upper lateral tube of forming drying tube and be arranged on the left side standpipe of forming drying tube and the leaf silk import of forming the lower transverse tubule bending place of drying tube; Wherein, the left side standpipe of described composition drying tube partly be by its caliber change from small to big, from large to small three sections reducer pipes constitute again.

The left side standpipe of forming drying tube described in the utility model partly is to be made of three sections reducer pipes that are provided with in the coaxial line mode, and the caliber that wherein is positioned at interlude is greater than upper and lower section caliber, and described upper and lower section caliber is for waiting gauge structure.

The utility model also can adopt following technique measures to realize: the left side standpipe of promptly described composition drying tube is partly for being similar to the bending three standpipe structures of S shape, and be positioned at the gauge structures such as standpipe Duan Wei of both sides, the caliber of middle standpipe section is greater than the caliber of the standpipe section of both sides between the standpipe section of both sides; The caliber that wherein is positioned at the standpipe section of both sides and middle standpipe section adapter section adopts respectively by little gradually big and by big gradually little reducer pipe structure.More specifically say, in the caliber of the standpipe section in middle standpipe section left side and the adapter section between the middle standpipe section little gradually big reducer pipe structure of serving as reasons; Middle standpipe section and the caliber of the adapter section between the standpipe section on its right side gradually little reducer pipe structure greatly of serving as reasons.

The beneficial effects of the utility model are as follows:

The utility model can make between air-flow and the material contact area, number of times and time obviously improve, heat and mass efficient improves, under identical starting and ending moisture content, dewater, the work wind-warm syndrome can reduce by 10-20 ℃, the moisture content of outlet standard deviation is controlled at ± 0.17% in, no matter be energy resource consumption or crudy all be improved significantly.

Description of drawings

Fig. 1 is the structural representation of prior art tobacco pneumatic conveying dryer.

Fig. 2 is the structural representation of first kind of embodiment of the utility model.

Fig. 3 is the structural representation of second kind of embodiment of the utility model.

Sequence number among Fig. 1,2,3: 1, leaf silk import, 2, feeder, 3, the outlet of leaf silk, 4, blower fan, 5, the humidity discharging mouth, 6, steam inlet, 7, heat exchanger, 8 right side standpipes, 9 upper lateral tubes, 10 left side standpipes, 10-1 standpipe section, standpipe section in the middle of the 10-2,10-3 standpipe section, Φ is a diameter, H is a height.

The specific embodiment

The utility model is further described below with reference to embodiment (accompanying drawing):

Embodiment 1

As shown in Figure 2, the tobacco pneumatic conveying dryer of present embodiment comprises the drying tube that is placed in the square loop configuration on the frame in the mode of vertical setting, be arranged on 8 of right side standpipes forming drying tube heat exchanger 7, be successively set on steam inlet 6 on the pipeline of heat exchanger top and the blower fan 4 that is connected with tube chamber, and be arranged on the feeder 2 of 9 of upper lateral tubes forming drying tube and be arranged on the leaf silk import 1 of the left side standpipe 10 of forming drying tube and drying tube lower transverse tubule 11 bending places; Wherein, left side standpipe 10 parts of forming drying tube be by its caliber change from small to big, from large to small three sections reducer pipes constitute again; Specifically, left side standpipe 10 parts of described composition drying tube are to be made of three sections reducer pipes that are provided with in the coaxial line mode, and wherein, the caliber that is positioned at interlude is greater than upper and lower section caliber, and described upper and lower section caliber is for waiting gauge structure.

Its operation principle is as follows: the leaf silk is the vertical reducing drying tube of H2 through pipe tobacco import 1 entry altitude, successively entry altitude be the dry I section of H2-1, highly for the dry II section of H2-2, highly be the dry III section of H2-3.The height of H2 is 15M, and dry I section height H 2-1 accounts for 1/3rd of whole drying tube height H 2; Dry III section accounts for 1/3rd of whole drying tube height H 2.Φ 2, Φ 4 adopts identical caliber, is 0.6-0.7m, and Φ 3 is 0.735-0.8575m by being calculated as 1.225 times Φ 2.Enter dry I section air velocity generally about 30m/s, enter dry II section, because it is big that caliber becomes, air velocity will enter dry III section for about 20m/s, and caliber diminishes, become Φ 4 by Φ 3, air velocity rises to again about 30m/s, arrives fast this change from fast to slow again by air-flow velocity, realizes the impulse drying to drying tube internal lobe silk.Leaf silk is after drying discharged through the leaf silk outlet 3 of feeder 2.

Embodiment 2

As shown in Figure 3, the difference of present embodiment and embodiment 1 is: left side standpipe 10 parts of described composition drying tube are the bending three standpipe structures (reducing drying tube) that are similar to S shape, and the standpipe section 10-1, the 10-3 that are positioned at both sides such as are at gauge structure, between the standpipe section of both sides in the middle of the caliber of standpipe section 10-2 greater than the standpipe section 10-1 of both sides, the caliber of 10-3; Wherein, the caliber of edge-on pipeline section 10-1 and the middle standpipe section 10-2 adapter section little gradually big reducer pipe structure of serving as reasons, the caliber of middle standpipe section 10-2 and the edge-on pipeline section 10-3 adapter section big gradually little reducer pipe structure of serving as reasons.

Its operation principle is as follows: the leaf silk enters S type reducing drying tube through tobacco import 1, and entry altitude is the standpipe section 10-3 of H3, middle standpipe section 10-2, highly is the standpipe section 10-1 of H4 successively; Wherein the height of H3 is 4-5m, and H4 highly is 6-7m, and Φ 5, Φ 7 calibers are identical, are 0.6-0.7m, and Φ 6 is 0.735-0.8575m by being calculated as 1.225 times Φ 5.Enter standpipe section 10-3 air velocity generally about 30m/s, the air velocity of standpipe section 10-2 becomes Φ 6 because caliber becomes big by Φ 5 in the middle of entering,, air velocity will become about 20m/s; The air velocity that enters standpipe section 10-1 becomes Φ 7 because caliber diminishes by Φ 6, and air velocity rises to again about 30m/s, arrives fast this change from fast to slow again by air-flow velocity, realizes the impulse drying to drying tube internal lobe silk.Leaf silk is after drying discharged through the leaf silk outlet 3 of feeder 2.

Claims

1, a kind of tobacco pneumatic conveying dryer, it comprises the drying tube that is placed in the square loop configuration on the frame in the mode of vertical setting, be arranged on the heat exchanger (7) between the right side standpipe (8) of forming drying tube, be successively set on steam inlet (6) on the pipeline of heat exchanger top and the blower fan (4) that is connected with tube chamber, and be arranged on feeder (2) between the upper lateral tube (9) of forming drying tube, with the leaf silk import (1) of the left side standpipe (10) that is arranged on the composition drying tube with drying tube lower transverse tubule (11) bending place, it is characterized in that: left side standpipe (10) part of described composition drying tube is to be changed from small to big by its caliber, three sections reducer pipes from large to small constitute again.

2, tobacco pneumatic conveying dryer according to claim 1, it is characterized in that: left side standpipe (10) part of described composition drying tube is to be made of three sections reducer pipes that are provided with in the coaxial line mode, the caliber that wherein is positioned at interlude is greater than upper and lower section caliber, and described upper and lower section caliber is for waiting gauge structure.

3, tobacco pneumatic conveying dryer according to claim 1, it is characterized in that: left side standpipe (10) part of described composition drying tube is for being similar to the bending three standpipe structures of S shape, and the standpipe section (10-1), (10-3) that are positioned at both sides for etc. gauge structure, the caliber of the middle standpipe section (10-2) between the standpipe section of both sides is greater than the standpipe section (10-1) of both sides, the caliber of (10-3).