Wyniki wyszukiwania - BazTech

1

Off-design operation of an 900 MW-class power plant with utilization of low temperature heat of flue gases

Milewski J., Bujalski W., Wołowicz M., Futyma K., Kucowski J.

Journal of Power Technologies

|

2015

|

Vol. 95, nr 3

221--227

EN

This article presents the off-design operation of a 900 MW-class steam turbine cycle upgraded with utilization of lowtemperature waste heat taken from boiler flue gas. The low-temperature heat contributes to increasing the efficiency of power plants without introducing many complex changes to the whole system. The base for investigations was a power unit operating in off-design conditions and supplied with steam from a BB–2400 boiler. Modifications to the model were made using commercially available software and by applying the Stodola equation and the SCC method. Calculations for off-design conditions show that, after making some modifications to the system, both heat and electricity generation could be increased through the addition of a low-temperature heat exchanger.

2

Off-design analysis of MCFC hybrid system

Milewski J., Miller A.

Rynek Energii

|

2012

|

Nr 1

151--160

EN

This paper sets out the results of mathematical modeling and numerical simulations of the off-design (part-load) operation of the molten carbonate fuel cell hybrid system (MCFC-HS). The governing equations of modeling are given and an adequate simulator of the MCFC stack was made and described. The performance of the MCFC-HS with part- and over-load operation is shown, and adequate maps are given and described. The ranges of possible system operation conditions are determined.

PL

Przedstawiono wyniki modelowania matemetycznego i symulacji cyfrowej pracy układu hybrydowego: węglanowe ogniwo paliwowe – turbina wodorowa w zmienionych warunkach pracy. Przedstawiono główne założenia wykorzystane do modelowania zarówno stosu ogniw paliwowych jak i pozostałych urządzeń. Przedstawiono pracę układu zarówno przy spadku obciążenia jak i jego nieznacznym wzroście na odpowiednio spreparowanych mapach.

3

Triple-layer based control strategy for molten carbonate fuel cell - hybrid system

Milewski J., Miller A.

Chemical and Process Engineering

|

2012

|

Vol. 33, nr 3

445-461

EN

Based on mathematical modelling and numerical simulations, a control strategy for a Molten Carbonate Fuel Cell Hybrid System (MCFC-HS) is presented. Adequate maps of performances with three independent parameters are shown. The independent parameters are as follows: stack current, fuel mass flow and compressor outlet pressure. Those parameters can be controlled by external load, fuel valve and turbine-compressor shaft speed, respectively. The control system is purposed to meet many constraints: e.g. stack temperature, steam-to-carbon ratio, compressor surge limitation, etc. The aim is to achieve maximum efficiency of power generated within these constraints. Governing equations of MCFC-HS modelling are given. An operational line of the MCFC-GT system is presented which fulfils several constraints (temperature difference, cell temperature, etc.) The system is able to achieve efficiency of more than 62% even in part-load operation.