一、设计方案的选择由于电加热具有易于控制、效率高、清洁卫生等一系列优点,故在工业上已日趋广泛使用。目前,在我国的许多化工厂、制药厂(例如醋酸裂介等)普遍采用调压器调压、变压器降压的方法进行电短路加热。而加热炉的热惯量较大,有滞后特性,因此用调压器、 First, the choice of design options As the electric heating with easy control, high efficiency, clean and health and a series of advantages, it has become increasingly widely used in industry. At present, many chemical plants in China, pharmaceutical plants (such as acetic acid cracking, etc.) commonly used regulator voltage regulator, transformer step-down method of electric short-circuit heating. The heating furnace thermal inertia larger, there are hysteresis characteristics, so the regulator,