Online sliding pressure optimization method for turbine of thermal power plant

Abstract

The invention discloses an online sliding pressure optimization method for a turbine of a thermal power plant. The online sliding pressure optimization method for the turbine of the thermal power plant includes that changing a steam distribution mode of a valve, and confirming a reasonable high-pressure control valve overlapping degree; testing the best valve sites when two valves of the high-pressure control valve are opened and three valves of the high-pressure control valve are opened so as to confirm the best valve sites; comparing the economical efficiency between the best valve site when two valves are opened and the best valve site when three valves are opened; calculating a back pressure correction pressure difference, a main steam temperature correction pressure difference, a reheat temperature correction pressure difference, a high-pressure cylinder efficiency correction pressure difference and a reheat attemperation water correction pressure difference, using each correction pressure difference to calculate a sliding pressure optimization pressure difference, calculating to obtain the sliding pressure optimization pressure (the best pressure) according to the sliding pressure optimization pressure difference, a design value of the sliding pressure and limited conditions, and using a loss differential system to display the best pressure in real time to realize the best precise control for the valve position so as to realize the sliding pressure optimization and all-season sliding pressure quantization and visualization.

Description

Technical field [0001] The invention relates to an optimization method, in particular to an online sliding pressure optimization method for a steam turbine of a thermal power plant, belonging to the field of optimized operation methods for power generation devices. Background technique [0002] Most of the existing power generation companies are using fixed-sliding-constant sliding pressure operation, which is also the designed sliding pressure mode. It is mainly determined through the comparison test of the fixed sliding pressure heat consumption of the unit by the Electric Power Research Institute to determine the best operating upper and lower inflection point. Economic benefits, currently used by most power plants, but failed to study the layout and opening method of the unit's high-pressure regulating valve, and failed to consider the precise valve point sliding pressure. Even if the valve point is sliding pressure, the unit boundary parameter changes are not considered On t...

AI Technical Summary

Problems solved by technology

[0002] Most of the existing power generation enterprises are using constant-sliding-constant sliding pressure operation. This is also the designed sliding pressure mode. It is mainly determined by the comparison test of the constant sliding pressure heat consumption of the unit by the Electric Power Research Institute to determine the best upper and lower inflection points of operation. Economic benefits, currently adopted by most power plants, but failed to conduct research on the arrangement and opening method of the high-voltage control valve of the unit, and failed to consider the precise valve point sliding pressure. The impact on the sliding pressure curve, and the quantification and visualization of the sliding pressure in all seasons by using the differential loss system have not been realized

Since the main steam pressure and the valve position of the unit are not in one-to-one correspondence under a certain load, the relationship is affected by the condition of the unit equipment and boundary parameters, so the pressure reference function obtained under certain seasons and specific unit state conditions has a certain The timeliness of the timeliness, the optimal test pressure under a certain load, when the season changes or the state of the unit changes, the opening of the high-pressure valve will change, thus deviating from the optimal valve position

Images