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Pre-treating system and method for recirculating air of drying system, and drying system and method

A drying system and pretreatment technology, applied in the direction of drying, drying machine, drying gas arrangement, etc., can solve the problem of water content reduction, achieve the effect of reducing water content, reducing the number of maintenance, and high specifications

Active Publication Date: 2013-01-16
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the technical defects that chemical products are easily affected by factors such as hot air and equipment during the drying process, and then reduce the quality of dried products, the purpose of this invention is to provide a pretreatment system for the circulating air of the drying system. The cleanliness of the air treated by the pretreatment system is greatly improved, and the water content is significantly reduced, thus avoiding the influence of circulating air on the quality of dried products

Method used

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  • Pre-treating system and method for recirculating air of drying system, and drying system and method
  • Pre-treating system and method for recirculating air of drying system, and drying system and method

Examples

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Embodiment 1

[0035] Such as figure 1 As shown, the circulating air pretreatment system of the drying system of the embodiment includes a first coarse-effect filter, a second coarse-effect filter, a first dehydration device, a first medium-effect filter, a second dehydration device and Second medium efficiency filter.

[0036] Wherein, the first coarse-effect filter is a coiled filter, and the second coarse-effect filter is a plate-type coarse filter, and the filtration accuracy of both is G4. According to the filter accuracy calculation formula η=1-(1-η 1 )(1-η 2 ) It can be seen that the joint filtration accuracy can be greatly improved by using two-stage coarse-effect filters in series.

[0037] The first dehydration device is a shell and tube heat exchanger with fins, and the second dehydration device is a rotary dehumidifier. The function of the first dehydration device is freezing and dehydration, and the function of the second dehydration device is further deep dehydration. The d...

Embodiment 2

[0041] The drying system of the embodiment includes an oven and a circulation fan connected to the oven, and also includes a circulating air pretreatment system, the pretreatment system is connected to the oven through the circulation fan; wherein the pretreatment The system is the pretreatment system described in Example 1; a sealed cover is provided at the connection between the oven and the circulating fan, and the connection gap between the oven and the circulating fan is wrapped in the sealed cover. In addition, a high-efficiency filter with a filtration precision of H14 is provided between the pretreatment system and the circulation fan.

[0042] figure 2 It shows a schematic structural diagram of the connecting part of the oven and the circulating fan in the drying system of this embodiment. Referring to the diagram, it includes an oven (not shown in the figure) and a circulating fan 5 communicating with the oven. The fan of the circulating fan 5 The shaft runs throug...

Embodiment 3

[0047] The drying system described in Example 2 was used to dry polytetrafluoroethylene (PTFE) dispersion resin.

[0048] The polytetrafluoroethylene dispersion resin to be dried is placed in an oven. The fresh air is first pretreated by the pretreatment system described in Example 1, and its cleanliness is increased to grade 7, and the water content is reduced to about 5g water / kg dry air. The pretreated air is further purified by a high-efficiency filter with a filter precision of H14 before being sent to the circulating fan, and the cleanliness can reach 5, and then sent into the oven. Due to the protective effect of the sealing cover, the air entering the oven maintains the previous cleanliness (level 5). If the sealing cover is not installed at the connection between the oven and the circulating fan, the cleanliness level of the air entering the oven can only reach level 9.

[0049] It only takes 18 hours to dry the PTFE dispersion resin from a water content of 30% to a ...

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Abstract

The invention relates to a pre-treating system for recirculating air of a drying system. The pre-treating system comprises a first rough filter, a second rough filter, a first dehydration device, a first intermediate filter, a second dehydration device and a second intermediate filter which are serially connected in sequence. The invention also provides a pre-treating method using the pre-treating system, a dying system comprising the pre-treating system and a corresponding drying method. By the pre-treating system and the pre-treating method, the cleanliness of treated air can be obviously improved, the moisture content of the air is reduced, and the influence of impurities carried by the air on materials to be dried is avoided. By the drying system and the drying method, the phenomenon that outside pollutants enter a drying oven to pollute products to be dried can be effectively avoided, and the cleanliness of dried products is improved, so that the overall quality of the products is improved.

Description

technical field [0001] The invention relates to the field of drying treatment of chemical products, in particular to a pretreatment system and a pretreatment method for circulating air in a drying system, and a drying system and a drying method including the pretreatment system. Background technique [0002] The commonly used drying method for chemical products is hot air circulation drying, that is, put the chemical products to be processed into the oven and then pass in high-temperature fresh air (air). Under the action of the fresh air and the circulating fan in the oven, the moisture in the chemical products Or the solvent is evaporated quickly. Due to the large volume of the oven, in order to make the hot air evenly distributed in the oven, it is necessary to install a circulating fan, but because the temperature in the oven is very high (generally 200-300°C), the connection between the motor of the circulating fan and the oven cannot be Mechanical seals or packing sea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B21/02
Inventor 张金刚冯启凤曾本忠张劲松曹利徐勇贾如志
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD