Study of the insulation effect of freezing apparatuses

• 作 者: JingWu Huang JianPing Wang Hen
• 机 构: Shandong Fengyuan Coal Industry & Electric Power Co. Ltd.,China Coal Research Institute
• 出 处: 寒旱区科学（英文版）
• 发表日期: 2004年期
• 关键词: freezing pipe insulation effect polyurethane energy conservation
• 基金项目: This work was supported by National S&T Support Program

In-situ tests and numerical manipulations were conducted for comparison of superior/inferior quality of casing-tube-vacuumized insulation and polyurethane insulation of freezing apparatuses in relation to non-uniform cold distribution in the multi-coil freezing layout and the contradiction between large-coil diameter layout of the freezing holes and stability of the headframe base.Tests show that:( 1 ) under current technology,vacuumized insulation is of short duration due to lack of appropriate applied vacuum; (2)after the freezing pipe is insulated with polyurethane,the temperature gradient is less than no insulation,and the temperature difference between insulated and non-insulated apparatuses is stable as the freezing period increases.Finally,it is pointed out that polyurethane insulation is quite efficient in present technical freezing construction.