An optimal control system and method for steam inlet throttling of steam turbines to meet peak shaving requirements

Abstract

The invention discloses a steam turbine inlet throttling optimization control system and method for meeting peak regulation requirements. Peak shaving, single low-pressure cylinder inlet throttling peak shaving, and medium-pressure cylinder and low-pressure cylinder inlet steam throttling and peak shaving at the same time; select the throttling condition with the largest profit value among the three throttling and peak-shaving modes as the optimal throttling condition Control conditions. The invention is also applicable to the peak regulation demand of the cogeneration unit in the non-heating period. When the boiler load is given, according to the relationship curve between the opening of the inlet steam regulating valve of the medium pressure cylinder and the exhaust steam pressure of the high pressure cylinder, and the relationship curve between the opening degree of the inlet steam regulating valve of the low pressure cylinder and the exhaust steam pressure of the medium pressure cylinder, the different regulating valves are calculated. The relationship between the power output of the coal-fired power unit and the standard coal consumption under the opening degree, taking the maximization of the profit value of electricity sales, peak shaving revenue and coal consumption cost as the objective function, to carry out the steam inlet throttle control of the medium pressure cylinder and the low pressure cylinder Search for the best.

Description

technical field [0001] The invention belongs to the technical field of peak shaving of a pure condensing coal power unit, and relates to a steam turbine inlet throttling optimization control system and method that meets the demand of peak shaving. Background technique [0002] At present, primary energy has a single structure with rich coal, lean oil and little gas, and coal still accounts for a relatively high proportion of primary energy consumption, reaching 57.7%. The energy structure has problems such as severe energy security situation, great pressure on carbon emission reduction, unreasonable energy consumption structure, prominent ecological and environmental problems, and low energy utilization efficiency. Cleanliness is one of the important directions of energy transformation. It is necessary to vigorously develop offshore wind power, develop nuclear power safely and efficiently, actively develop large-scale hydropower in the basin, and promote clean, efficient and...

AI Technical Summary

Problems solved by technology

However, most of the existing coal-fired flexible peak-shaving retrofit technologies are suitable for cogeneration units. During the non-heating period of pure condensing units or cogeneration units, only boiler low-load safe and stable combustion retrofit technology is suitable for deep peak shaving. The available technology is single, and the depth of peak regulation still does not meet the requirements of power grid dispatching, which reduces the profitability of coal-fired power units and seriously restricts the large-scale development of new energy

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