保持厌氧消化温度的传热计算

Calculaton of heat transfer at keeping the temperature of anaerobic digestion

在冬季,厌氧池污水温度降至10℃乃至以下,厌氧消化难以运行,因为低温阻碍厌氧消化进行,所以需要对厌氧池污水加热。这是个不稳定传热过程。文中提供了用外置式列管换热器,以饱和水蒸汽和热水加热厌氧池循环污水至稳定消化温度的传热过程计算及其计算程序,文末还以两个典型示例详述了计算过程。

In the winter the sewage temperature of anaerobic digester will drop to 10℃ or even lower. Anaerobic digestion is difficult to run because lower temperature will impede anaerobic digestion,so it will be necessary to heat the sewage of anaerobic digester. This is an unsteady process of heat transfer. In the process the anaerobic digester sewage will be heated with the saturated steam and the hot water in the external shell-and-tube heat exchanger until a steady digestion temperature is attained. This paper provides the calculation process and its programs of heat transfer. Also, two typical examples are provided to better demonstrate in detail the calculation processes in the latter of this paper.