Shigehisa Sugita

Analysis of control characteristics using fuel cell plant simulator

To estimate the operational characteristics of duel cell power plants, the authors developed a dynamic simulator and analyzed the operating characteristics. In the simulations, attention is given to the pressure difference between the cathode and anode of the fuel cell and the system base pressure. The former is important for safe operation of the fuel cell and the latter is important for safe operation of the reformer. For load following and shut-down modes of the 1 MW plant studied, calculation results were compared with actual test results and agree fairly well. >

A Method for Analyzing Sensitivity of Recoverable Heat in a Heat Recovery Steam Generator.

We propose a method for analyzing the sensitivity of recoverable heat in a multi-pressure heat recovery steam generator. In order to calculate how much steam is supplied to the steam turbine, equations of heat balance are derived from the quantities of steam which are generated in the heat recovery steam generator and recoverable heat such as that of gas turbine exhaust or from other heat sources. A matrix which represents the relationship between the quantities of steam and the recoverable heat is obtained from the equations of heat balance. The performances of the bottomming cycle can be analyzed by comparing the elements of the matrix. This method is applied to bottomming cycles of a three-pressure heat recovery steam generator which have various types of recoverable heats.