Temperature control ( Is control of your process temperature important ? )
Many types of steam plant need to be fitted with some form of temperature control. In any process, product quality is often dependent upon accurate temperature which depends on it's proper control. From an energy saving point of view, the ideal temperature is obviously the lowest, which can be accepted for any given application.
In order to lower the temperature of the contents of the tank, the rate at which heat transfer takes place from the coil must be reduced. The simplest way of doing this is to reduce the temperature of the steam in the coil. Clearly, this will lower the difference in temperature between the steam and the product being heated and reduce the rate of heat transfer, as desired. We know from the steam tables that any reduction in the pressure of saturated steam is accompanied by a drop in temperature. For this reason, a suitable means of controlling steam pressure is the natural solution to the problem of controlling the rate of heat transfer in a coil heated tank.
Temperature control can be achieved by manually throttling the steam valve and manipulating steam flow, in the same way that a gas tap is used to regulate the supply of heat on a domestic cooker. Unfortunately, such an arrangement may call for frequent manual adjustment if the heat requirements of the equipment in question are liable to fluctuate significantly. More accurate control can be obtained by the installation of a pressure reducing valve but the need for manual adjustment still remains. The ideal answer is to fit one of the Automatic Self Actuating Temperature Control System .