Simple calculation method for variable working condition performance of steam extraction heat supply type gas-steam combined cycle unit

Abstract

The invention discloses a simple calculation method for variable working condition performance of a steam extraction heat supply type gas-steam combined cycle unit. The method comprises. The method comprises the following steps: building a gas cycle variable working condition model of the combined cycle unit, and calculating gas parameters under variable working conditions according to the gas cycle variable working condition model; correcting gas parameters under variable working conditions; and calculating variable working condition output parameters of the combined cycle unit. According tothe invention, a data and mechanism combined modeling mode is adopted; a component characteristic equation derived from experimental rules and theories is used as a basis; fitting the key parameters and the key coefficients of the equation by utilizing past data of the unit; the application range of the model is widened; the problems that a gas compressor and a gas turbine in gas circulation are difficult to model due to the fact that manufacturers keep performance data secret, and the modeling process of a waste heat boiler is complex are effectively solved. Simple calculation of the variableworking condition performance of the gas-steam combined cycle unit considering universality and high precision is achieved, and an effective means is provided for variable working condition characteristic analysis of the combined cycle unit.

Description

technical field [0001] The invention belongs to the technical field of thermal power engineering, and in particular relates to a simple calculation method for the variable working condition performance of a steam extraction and heat supply type gas-steam combined cycle unit. Background technique [0002] In recent years, as the Chinese government pays more and more attention to environmental issues and energy issues and the environmental pressure continues to increase, the development of clean energy power generation technology has become the main research direction of academia and the power industry. The gas-steam combined cycle unit fueled by natural gas is an energy conversion device with high energy utilization efficiency, low environmental cost, flexible operation, reliable technology, and diversified combinations. It has multiple social and economic benefits and is well received at home and abroad. received widespread attention. [0003] Due to the needs of power grid...

AI Technical Summary

Problems solved by technology

However, the thermodynamic calculation of the gas-steam combined cycle unit for steam extraction and heating is often limited by many factors. First, it is difficult to obtain the performance characteristic curves of the compressor and gas turbine; There are too many data, the amount of calculation is large, and it is often difficult to promote, and the model that relies entirely on data is usually only applicable to specific units; third, the conventional calculation method of variable working conditions does not consider the influence of steam extraction and heat supply, which makes the combined cycle unit work variable. The calculation method of the situation is difficult, complicated and incomplete

Images