电加热式出料罩在CTD气流烘丝机中的应用

摘要

During tobacco drying, cut tobacco tends to buildup on the sidewall of the discharging hood in Comas Tower Dryer(CTD)and steam tend to condense on the sidewall and fall into tobacco, wet tobacco and wet tobacco balls may occur, therefore the sidewall was modified with electric heating after analyzing the temperature difference between the sidewall and the humid air. The sidewall was heated by electric heating elements. The relationship between the temperature of sidewall and the amount of tobacco buildup was determined via experiments, the heating temperature of sidewall was set at 80 ℃, and the power of heating elements was calculated according to thermodynamic formula. The results showed that the tobacco buildup reduced from 5.6 kg per batch to zero, and wet tobacco was avoided. The temperature and moisture content of cut tobacco were stable, the sensory quality of cut tobacco did not change obviously. With timely and sensitive temperature feedback, the temperature of the sidewall was controlled accurately, and the processing quality of cut tobacco was promoted effectively.%为解决CTD（Comas Tower Dryer）气流式烘丝干燥机在使用过程中存在出料罩侧壁粘料、结露滴漏并诱发湿团烟丝等问题，通过分析出料罩侧壁与烟丝潮气之间的温差关系，对烘丝机出料罩的侧壁进行了电加热改造。采用电加热元件作为热源，对侧板进行加热；通过试验得出加热温度与侧壁粘料量的关系，确定侧壁加热温度为80℃；利用热力学公式计算得出电加热元件功率。结果表明，电加热式出料罩能够解决烘丝机出料罩侧壁粘料、结露及湿团烟丝掉落等问题，粘料量由平均5.6 kg/批次减少到0，消除了湿团烟丝掉落现象；烟丝温度和含水率稳定，感官品质未发生明显改变；采用电加热元件加热侧板方式，控制准确，温度反馈及时灵敏，有效提高了烟丝工艺品质。