| 摘要 |
PURPOSE:To facilitate operation of a fuel reformation system by improving the control of cell operation temperature by directly detecting the temperature of cooling water flowing near the inlet of a cell stack and controlling the pressure of steam in a steam separator so as to control the influence of the variation in the heating value in the stack on the temperature of cooling water. CONSTITUTION:The heat exchanger 7 of a cooling-system controller is installed parallel to a main line of cooling water. It is controlled by separating cooling water. while cooling water separated from steam in a steam separator 1 is fed to a cell stack 2 by means of a circulation pump 6, part of the cooling water is cooled by being fed through the exchanger 7 before passing through a three-way control valve 8. The control valve 8 is operated by using a thermometer 5 to measure the temperature of cooling water flowing near the inlet of the stack 2 and then using a PI computing element 10B to compute the difference between the measure temperature and set temperature (To). A flow-ratecontrolling valve 4 is installed near the outlet of a heat exchanger 3 attached to the upper portion of the separator 1. A pressure detector 9 is used to measure the internal pressure of the separator 1 and then the difference between the measured internal pressure and set pressure (Po) is obtained to operate the valve 4, thereby improving the control of cell operation temperature. |
