Partial tail gas circulation fluid bed drying method and equipment

A technology of fluidized bed drying and fluidized bed drying machine, which is applied in the direction of drying solid materials, drying gas arrangement, lighting and heating equipment, etc., and can solve the problems of low heat energy utilization rate, poor heat transfer effect, difficult continuous operation, etc. Reach the effect of reducing the temperature of exhaust gas, avoiding material denaturation and reducing the total amount of exhaust gas

Active Publication Date: 2014-10-22
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of poor heat transfer effect, low heat energy utilization rate and difficulty in continuous operation of the current fluidized bed drying equipment, this invention proposes a part tha

Method used

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  • Partial tail gas circulation fluid bed drying method and equipment
  • Partial tail gas circulation fluid bed drying method and equipment
  • Partial tail gas circulation fluid bed drying method and equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment 1 The method for part tail gas circulating fluidized bed drying of the present invention comprises the following steps:

[0054] 1) Material drying:

[0055] The wet material is continuously fed into the fluidized bed dryer by the screw feeder, dispersed, heated, fluidized and preliminarily dried in the first chamber, and then enters each drying chamber to continue fluidized, heated and dried, and the material is dried to a certain When the bed temperature reaches 125-135°C, it enters the cooling chamber and is cooled by the cooling gas. After the bed temperature reaches 45-55°C, the material is discharged into the block separator by the screw discharger for block separation. The qualified products are separated by the gas for separation. Transported to the bag filter for packaging and storage after separation;

[0056] The lumps separated by the lump separator are discharged from the first star discharger for reprocessing;

[0057] The dust entrained by th...

Embodiment 2

[0066] Example 2 The equipment constructed according to the method for drying part of the tail gas circulating fluidized bed according to the present invention includes a fluidized bed dryer body 02, a screw feeder 01, a first heating device, a second heating device, a cooling device, Dust removal device, the fluidized bed dryer body 02 includes an upper bed body 31, a lower bed body 37, and a distribution plate 36, and the distribution plate 36 is installed in the cavity formed by the upper bed body 31 and the lower bed body 37. Tongue-shaped punching, the opening is towards the outlet of the fluidized bed dryer; the top plate of the upper bed body 31 is provided with a first exhaust port 30 and a second exhaust port 28 communicating with the inner cavity, and the side wall is provided with an outlet connected to the inner cavity. Connected wet material inlet 34 and material outlet 22; the lower bed body 37 is provided with a first hot air inlet, a second hot air inlet and a c...

Embodiment 3

[0078] Embodiment 3 (1) with figure 1 Partial tail gas circulating fluidized bed drying process flow chart (external bagging process)

[0079] Material flow: The wet material is continuously fed into the fluidized bed dryer 02 by the screw feeder 01, dispersed by the rake 35 in the first room, fluidized by hot air, and preliminarily dried, and then enters each drying room in sequence to continue fluidization, heating, Drying, the material is dried to a certain extent, the bed temperature reaches 125-135°C and enters the cooling chamber 23 to be cooled by the cooling gas, the bed temperature reaches 45-55°C, the material is discharged into the block separator 03 by the screw discharger 04 for block Materials are separated, and the qualified products are transported to the first bag filter 06 by the gas used for separation and packaged and stored by the second star discharger 07.

[0080] The lumps separated by the lump separator 03 are discharged from the first star discharger...

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Abstract

The invention provides a partial tail gas circulation fluid bed drying method and equipment. The method comprises the following steps of (1) material drying, (2) tail gas circulating, (3) tail gas discharging, (4) material cooling and (5) lump material separating. Air is filtered, pressurized and heated to be at the needed temperature and enters a deep drying section of a fluid bed drying machine to conduct deep material drying, tail gas which is discharged from the deep drying section of the fluid bed drying machine and is high in temperature and low in moisture content is dedusted, pressurized and heated and then enters a primary drying section of the fluid bed drying machine to conduct primary drying, and the tail gas which is discharged from the primary drying section of the fluid bed drying machine and is low in temperature and high in moisture content is dedusted and then discharged into the atmosphere. The equipment constructed based on the partial tail gas circulation fluid bed drying method comprises a fluid bed drying machine body, a first heating device, a second heating device, a cooling device and a dedusting device. The partial tail gas circulation fluid bed drying method and equipment have the advantages that the heat energy of drying media is fully used, drying heat efficiency is high, consecutive operation is reliable, energy is save, and emission is reduced.

Description

technical field [0001] The invention relates to a drying method and equipment of a part tail gas circulating fluidized bed. Background technique [0002] Fluidized bed drying has a large contact surface area due to the direct contact between the gas-solid two-phase and the vigorous fluidized agitation during the drying process. It has advantages in heat transfer, mass transfer, drying strength, thermal efficiency, etc., and has been widely used in chemical industry and medicine. , Food and other industry products drying. [0003] The traditional horizontal fluidized bed drying process is that the wet material is added from one end of the fluidized bed dryer, and under the action of the hot drying medium, the material is fluidized while being dehydrated and dried, and then passes through each drying chamber to meet the drying requirements, and the product is dried from the fluidized bed The other end of the machine is discharged for packaging and storage. The drying medium ...

Claims

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Application Information

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IPC IPC(8): F26B3/08F26B21/02F26B25/00
Inventor 程榕郑燕萍孙勤杨阿三
Owner ZHEJIANG UNIV OF TECH
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