Comprehensive calculation method for energy-saving effect after steam turbine steam seal modification

Abstract

The invention discloses a comprehensive calculation method for an energy-saving effect after a steam turbine steam seal modification. In detail, the comprehensive calculation method includes the steps that pressure, temperature, flow and electric power test points are arranged on a steam turbine set thermal system; fed water flows, main steam flows, cold reheat steam flows and reheat steam flows are calculated; steam leakage amount of high pressure cylinder and intermediate pressure cylinder balance disc shaft seals of a set is calculated; the steam leakage amount of the high pressure cylinder and intermediate pressure cylinder shaft seals, the steam inlet amount of a low pressure cylinder shaft seal, pressure of the low pressure cylinder shaft seal and temperature rise of condensation water passing through a shaft seal heater are measured; the test heat rate of the set and a heat rate after a parameter modification are calculated; all parameters of a steam turbine are compared with design values prior to the steam shaft modification, so that the energy-saving effect of the steam turbine steam seal modification is evaluated. Through thermal performance testing performed on the steam turbine, the parameters of the thermal system are tested, and the evaluation and analyzing method for the energy-saving effect after the steam turbine steam seal modification are provided. The method is simple and reasonable, and the calculated result is more accurate.

Description

technical field [0001] The invention relates to the field of steam turbines, in particular to a comprehensive calculation method for the energy-saving effect of steam turbine seal reformation. Background technique [0002] The most commonly used steam seal for modern steam turbines is still the comb structure. In recent years, with the development of technology, many new types of steam seals have been introduced from abroad. The typical ones are: honeycomb steam seal, brush type steam seal, adjustable Gas seal, contact type gas seal, side gear gas seal, etc. Although these steam seals have different structural forms, the designer's guiding ideology is to increase the number of teeth, reduce the gap, and increase the resistance to improve the sealing effect and reduce the loss caused by steam leakage. The new type of steam seal is currently widely used in steam turbines. The steam seal of the flow part and the steam seal of the shaft end are being upgraded. [0003] Steam t...

AI Technical Summary

Problems solved by technology

Due to the different models of the unit, the influence of steam leakage from the steam seal and shaft seal on the performance indicators of the unit is not the same. Sometimes, the improvement of the cylinder efficiency and heat consumption rate is not obvious after the steam seal of the steam turbine is modified, and the flow part of the unit is also included. Overhaul effects such as descaling, system internal and external leakage control, etc. Therefore, it is impossible to conduct a comprehensive analysis of the effect of steam turbine seal transformation by only using the improvement of cylinder efficiency and heat consumption rate

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