China's tobacco industry drying equipment mainly imported from abroad
The tobacco airflow drying equipment used in the tobacco industry in China is mainly imported and digested and absorbed from abroad, and some improvements have been made to the equipment during its use. In 2002, the "SH9 type wire on-line high-speed expansion system" jointly developed by Changzhou Zhisi Machinery Manufacturing Co., Ltd. and Hefei Cigarette Factory adopts a tube tower structure and pulsed air flow transmission, which greatly increases the heat transfer coefficient during the drying process. The midstream is fully in contact with the cut tobacco, which effectively reduces the clumping of the tobacco due to the uneven moisture content. In addition, Li Wei and others modified the vertical drying pipe of the HXD airflow drying system manufactured by Dickinson-Legg Company to an arc-shaped flow path with a large radius and a horizontal drying pipeline with an elliptical cross-section, and improved the proportion of hot air distribution. The moisture content of the dried export tobacco is more even, and shreds are reduced.
Air drying equipment
With the deepening of research on tobacco drying equipment and technology, people are considering how to obtain better sensory quality while using air drying equipment to improve the drying effect and physical characteristics of tobacco. For the use of higher air temperature drying flue gas when the flavor volatile, resulting in loss of aroma and smoke problems, Uematsu Hong Hai, etc. in the downstream position of the drying pipe inlet to the high temperature air flow spray a certain amount of steam or water to In this way, the heat transmitted by the air flow to the cut tobacco is controlled so that the tobacco can retain its original aroma while rapidly expanding. Lowering the airflow speed at the end of the drying of the tobacco stream can also avoid the loss of aroma due to overheating of the tobacco shreds. Huang Jia throws out that when superheated steam is used to dry the shredded tobacco at a high temperature, the dried air at the dry base of the cut tobacco is reduced to 15.0% to 16.5% of its diameter. The temperature of the drying air is low and the air has a certain moisture content. To reduce, to avoid too much loss of tobacco aroma, but also can reduce the burnt smell.
At present, the air-flow drying equipment used in the domestic tobacco industry mainly consists of the HXD high-temperature airflow type tobacco dryer of Diekinson-Legg, UK, with a production capacity of 4800-10000 kg/h; HDT superheated steam dryer of Germany HAUNI, with a maximum production capacity of 10000 kg/ h; domestic self-developed SH9 tobacco high-speed expansion dryer and digestion and absorption of the SH963 tobacco drying equipment. HXD is currently used in many domestic tobacco companies. The system is mainly composed of a combustion furnace, a heat exchanger, a feed system, an air-flow expansion drying tube and a cyclone separator. The working air temperature control range is 260-480°C, and the process air velocity can be About 60m/s, the moisture content of the tobacco can be controlled through the process parameters such as temperature, simulation load flow rate, spray volume control, and steam injection quantity, to ensure the product quality is uniform and stable.
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Air dryers are mainly composed of drying pipes, cyclone separators and fans (see fluid transport machinery). The wet material is continuously added to the lower part of the drying tube through the feeder, and is dispersed by the high-speed hot air flow. During the gas-solid flow, the heat transfer and the mass transfer are performed, so that the material can be dried. The dried solid material enters the cyclone separator with the airflow, is collected after separation, and the exhaust gas is discharged through the fan. Since the rising speed of the material just entering the drying tube is zero, the relative velocity between the gas and the particle is the largest and the particle density is the highest, so the volume heat transfer coefficient is the highest. In the material inlet section (a height of about 1 ~ 3m), the heat transferred from the gas to the material can reach 1/2 to 3/4 of the total heat transfer. Above the inlet section, the relative velocity between the particles and the gas flow is equal to the sedimentation velocity of the particles, and the heat transfer coefficient is not large. Therefore, the inlet section is the most effective section of the entire airflow drying device .
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