Pressure adjustment method of combined cycle waste heat boiler for gas turbine deterioration

Abstract

The invention discloses a pressure adjustment method for a combined cycle heat recovery boiler with a deteriorated gas turbine. The method comprises steps as follows: 1), a gas turbine model provided with an IGV (inlet guide vane) for adjustment and used for a specific unit is established according to a universal characteristic curve of a gas turbine in combination with a regression analysis method; 2), a heat recovery boiler model is established on the basis of a convection heat transfer empirical formula and an energy conservation principle; 3), the unit is controlled to operate according to the corresponding relation between the turbine exhaust gas temperature of the gas turbine and the opening of the IGV and in reference of the practical control principle of the gas turbine unit; 4), when a part of the gas turbine is deteriorated, the opening of the IGV is required to be readjusted to reach designated power, the exhaust parameter of the gas turbine is changed, then the operation performance of the heat recovery boiler is changed, at the time, operation pressure of the heat recovery boiler is optimized, the heat recovery boiler and the gas turbine can adapt to new work conditions and have higher power, new sliding pressure is acquired when the IGV has a new opening or combined cycle power is reached. The operation pressure of the heat recovery boiler can be optimized, and the operation efficiency is improved.

Description

technical field [0001] The invention relates to the field of gas turbines, in particular to a method for adjusting the pressure of a combined cycle waste heat boiler aiming at the deterioration of the gas turbine. Background technique [0002] In 2003, my country introduced a batch of F-class heavy-duty gas turbine combined cycle units by using the market-for-technology bundling bidding method. With the increase of power plant operation time, the deterioration of gas turbine components is inevitable. During the use of gas turbine components, due to the slight deformation, wear, corrosion and aging of the components themselves, the original performance will gradually decline, which is called the deterioration of gas turbine components. The most intuitive manifestation is the decline in component efficiency under the same external conditions. The turbine blades of the gas turbine in the combined cycle unit work in a harsh environment of high temperature and high pressure. Unle...

AI Technical Summary

Problems solved by technology

These parameter changes will affect the operating performance of the waste heat boiler, so that the original design operating parameters (such as steam pressure at all levels) may not be the optimal value. Therefore, it is necessary to optimize the operating pressure of the waste heat boiler so that the combined cycle can High-efficiency operation of the unit

Images