Comprehensive Calculation Method for Energy-saving Effect of Steam Turbine Seal Reformation

Abstract

The invention discloses a comprehensive calculation method for the energy-saving effect of steam turbine steam seal reformation. The specific steps are: arranging test points for pressure, temperature, flow and electric power in the thermal system of the steam turbine unit; calculating feed water flow, main steam flow, cold reheat steam Flow rate and reheat steam flow; 4: steam leakage of high and medium pressure cylinder balance plate shaft seal of computer group; measure high and medium pressure cylinder shaft seal leakage, low pressure cylinder shaft seal inlet steam, low pressure shaft seal pressure, Condensed water temperature rise of shaft seal heater; computer group test heat consumption rate, heat consumption rate after parameter correction; compare steam turbine parameters with design values ​​before steam seal renovation, and evaluate energy saving effect of steam turbine steam seal renovation. This method tests the parameters of the thermal system through the thermal performance test of the steam turbine, and provides the energy-saving effect evaluation and analysis method after the steam seal modification of the steam turbine. The method is simple and reasonable, and the calculated results are 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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