| 摘要 |
PURPOSE:To permit to regulate the temperature of liquid at the side of the heat transfer tube of an evaporating section in a predetermined value in spite of the condition of the side of heat source by a method wherein the temperature of liquid, which has effected heat exchange in the heat transfer tube of a condensing section, is detected and is compared with an objective value to output a control signal and change the liquid level of the heat transfer tube of the evaporating section. CONSTITUTION:The temperature of process gas 6, being preheated in the heat transfer tube 3 of a condensing section, is detected by a temperature detector 11 and is compared with an objective value by a temperature regulating meter 12. When the temperature of the process gas 6 has become higher than the objective value, a signal to reduce the temperature is provided to a hydraulic device 24 from the temperature regulating meter 12. According to this operation, a hydraulic pressure, given from the hydraulic device 24 to a hydraulic driving unit 23, is reduced and the level of a medium reserving tank 22 is lowered by descending the hydraulic driving unit 23. When the level of the tank 22 is lowered, the medium in the heat transfer tube 4 of the evaporating section moves into the reserving tank 22 by a head difference and the level of the liquid in the heat transfer tube 4 of the evaporating section is lowered, therefore, the amount of medium, contributing to the transfer of heat, is reduced and a heat transfer area is reduced. On the other hand, in case the temperature of the process gas is reduced to a value lower than the objective value, the hydraulic device 24 is imparted with a control signal in a contrary manner. |
