Vent gas circulating type spiral pipe blast drier and its drying method

Abstract

The invention relates to an exhaust gas circulating spiral pipe pneumatic dryer and a drying method thereof. A pneumatic drying pipe is made into the spiral pneumatic drying pipe, thereby leading the spiral pneumatic drying pipe to be positioned in a high temperature zone and forming the convection heat transfer in the pipe and the conduction heat transfer out of the pipe, namely the heating of the interior and the exterior of materials is simultaneously carried out, thereby being capable of improving the heat transfer rate and shortening the drying time of the materials. The exhaust gas circulation is further adopted for heating the materials and fully utilizing waste heat in the exhaust gas. The structure comprises a cylindrical container, a first-stage spiral pneumatic drying pipe, a second-stage spiral pneumatic drying pipe, a first-stage drying cyclone separator, a second-stage drying cyclone separator, a first-stage drying induced draft fan, a second-stage induced draft fan and a receiving hopper; the first-stage spiral pneumatic drying pipe and the second-stage spiral pneumatic drying pipe are arranged in the cylindrical container, a hot air inlet is formed at the bottom part of the cylindrical container, a second hot air outlet is formed at the upper part of the cylindrical container, and a first hot air outlet is formed at the lower part of the cylindrical container.

Description

technical field [0001] The invention relates to a tail gas circulation type spiral tube airflow dryer and its drying method. The airflow drying pipe is made into a spiral airflow drying pipe, so that the spiral airflow drying pipe is located in a high temperature zone, forming a convective heat transfer inside the pipe. The outside of the tube is conduction heat transfer, that is, the material is heated inside and outside at the same time, which can increase the heat transfer rate and shorten the drying time of the material; and use part of the exhaust gas circulation to heat the material to make full use of the waste heat in the exhaust gas to achieve the purpose of energy saving. Background technique [0002] The airflow dryer has been widely used in chemical, pharmaceutical, food, dyestuff, plastic and other industrial production, because the airflow dryer has many advantages: high drying strength, short drying time, large processing capacity, simple equipment, convenient ...

AI Technical Summary

Problems solved by technology

But it also has some defects: it takes up a lot of space, and if it is placed indoors, the required factory building height is very high, so most manufacturers protrude the drying pipe from the roof, which causes difficulties in installation, maintenance and cleaning. Airflow dryers are difficult to use for drying products with high hygienic requirements

Due to the high height of the drying pipe, it takes up a lot of space and the overall structure is not compact, which brings certain difficulties to installation, maintenance and cleaning, so it is difficult to be used in clean workshops

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