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发明公开
CN1985068A 用于对地下地层进行加热的具有导热流体的温度受限加热器 无效 - 撤回

用于对地下地层进行加热的具有导热流体的温度受限加热器
摘要：
本发明提供一种系统，这种系统包括：加热器，该加热器包括一个或多个电导体。加热器被构造成在把电流施加到加热器期间产生热输出。加热器包括铁磁材料。一管道至少部分地环绕着加热器。流体被定位在加热器和管道之间的空间中。在标准温度和压力(STP)(0℃和101.325kPa)下，所述的流体比空气具有较高的热导率。所述的系统被构造成：(a)当随时间变化的电流被施加到加热器时，在选定温度以下，提供第一热输出，(b)当随时间变化的电流被施加到加热器时，在选定温度以上或接近于该选定温度，提供第二热输出。
摘要（英）：

The invention provides a system that includes a heater comprising one or more electrical conductors. The heater is configured to generate a heat output during application of electrical current to the heater. The heater comprises a ferromagnetic material. A conduit at least partially surrounds the heater. A fluid is located in a space between the heater and the conduit. The fluid has a higher thermal conductivity than air at standard temperature and pressure (STP) (0 DEG C and 101.325 kPa). The system is configured to provide (a) a first heat output below a selected temperature when time-varying electrical current is applied to the heater, and (b) a second heat output near or above the selected temperature when time-varying electrical current is applied to the heater.

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