A Method of Improving Steam Turbine Exhaust Parameters

Abstract

The invention provides a method for improving steam exhaust parameters of a turbine. The method includes the steps that according to user requirements, concrete numerical values which the steam exhaust parameters need to reach are determined; according to the determined steam exhaust parameters, low-pressure stage sets of the turbine are reduced; a brand new through-flow design is performed on remaining low-pressure stage sets, and protective measures are added for the remaining low-pressure stage sets; a cooling device with controllable steam exhaust temperature is designed for a low-pressure cylinder, a bearing structure on a low-pressure rotor is designed again, if a base cylinder type bearing pedestal is adopted for the bearing structure, the installation height of the low-pressure rotor is calculated again, and if a floor type bearing pedestal is adopted, the gap between the low-pressure rotor and a radial-direction steam seal is designed into the mode that the gap is gradually increased from the middle dividing face to the upper portion and the lower portion; if the steam exhaust parameters from the high-pressure cylinder to the low-pressure cylinder can not be achieved, an intermediate pressure cylinder of the turbine supplies directly, and no steam enters the lower-pressure cylinder any more. Operation efficiency and heat supply efficiency of the turbine after improving the steam exhaust parameters are improved, and meanwhile safety is improved.

Description

technical field [0001] The invention relates to the technical field of modification of exhaust parameters of large and medium-sized steam turbines, in particular to a method for improving exhaust parameters of steam turbines. Background technique [0002] A turbogenerator set is an energy conversion device that converts thermal energy into mechanical energy and then into electrical energy. It is one of the key power equipment in power station construction. The high-temperature and high-pressure steam produced by the boiler converts heat energy and pressure potential energy through the steam turbine, and becomes the mechanical energy of the steam turbine, which drives the output shaft of the steam turbine rotor to do work. The mechanical energy is transmitted to the generator through the output shaft of the steam turbine rotor, thereby converting the mechanical energy into Electric energy, therefore, the steam turbine as the source motor is often referred to as the "source of...

AI Technical Summary

Problems solved by technology

However, the steam extraction transformation of pure condensing steam turbines has a limited increase in the steam extraction volume, and there is also a problem that the steam flow of the steam turbine after steam extraction does not match the downstream flow of the steam turbine, resulting in a significant decrease in efficiency.

With the continuous increase of steam extraction after steam extraction transformation, it will also pose a certain threat to the safe operation of steam turbines

Images