Study Of Logic-Matrix Model Of Parallel Method On Power Plant System

Energy saving is the core of energy stratagem in China. At present, power plant is not only considered as the main energy supplier but also the main resource consumer and polluter. It also emits a lot of greenhouse gas. Therefore, it has taken great attention how to improve operation economy and the equipments reliability in power plant.The economy of power plant can be estimated by heat economy, through which the situation of energy utilization and conversion of heat and power can be known. On the foundation of safe operation, calculation and analysis of heat economy in power plant is an effective way to improve operation manipulation and scientific management. The heat economic indicators are the basis of thermal power plant design, technological transformation, operational optimization and performance monitoring. Accordingly, calculation of thermal system contributes a lot to energy saving.Logic parameters have been put forward to express thermal system structure and heater types. Based on matrix theory, the matter balance and energy balance relations of heaters are derived and a currency logic-matrix model of parallel algorithm is developed. In this model, all of the power plant system characteristic parameters are included, such as heater efficiency, bypass water and steam flux. In this paper, the rules of how to fill in the matrixes are introduced.Based on this model, a currency program is designed in MATLAB. Just entering structure parameters and equipments parameters, steam expanding route can be protracted and steam extraction coefficients, economic indices of steam turbine as well as power plant thermal system can be calculated. When thermal system structure is changed or operation condition is changed, it only needs to adjust relative parameters other than intervening coefficients of matrixes. The model is validated by four designed operation conditions of 660WM steam turbine. The results show that the model is attested to be reasonable, accurate and current comparing with known data.The uses of the model in different operation conditions have been discussed in this paper, including heater terminal temperature difference, extraction steam pressure loss, without high-pressure heaters, water bypass, condenser vacuum and condenser terminal temperature difference. The results show that, the increase of heater terminal temperature difference and extraction steam pressure loss, operation without high-pressure heaters, water leaking bypass, bad condenser vacuum and increase of condenser terminal temperature difference can influence the heat economy of thermal system and increase coal consumption. It provides a direction for the optimization and reconstruction of power plant.