Generating set optimization control method for correcting sliding pressure operation curve by adopting steam consumption rate

Abstract

The invention discloses a generating set optimization control method for correcting sliding pressure operation curve by adopting steam consumption rate, which comprises the detailed steps of: confirming the throttling coefficients and minimum pressure of a steam turbine under a designed working condition according to the load command of the generating set and confirming the main steam pressure set value; confirming the parameters of dynamic compensation section according to the main steam pressure response characteristics; respectively calculating the steam consumption rate of the generating set under the designed working condition and the actual working condition, working out the steam consumption rate correction coefficients, and implementing online correction on the load command of the generating set; using the corrected load command to divide the throttling coefficients of the steam turbine, then implementing calculation on the dynamic compensation procedure and minimum pressure limitation, and finally obtaining the best main steam pressure set value of the generating set under the current operation condition. The best main steam pressure set value is applied in a cooperation control system of a unit set so as to realize the best cooperation relation between the inlet steam pressure and inlet steam flow of the generating set, thus reducing the throttling loss of the steam turbine and guaranteeing the best thermoeconomic performance of the generating set.

Description

technical field [0001] The invention relates to an automatic control method, in particular to an automatic optimal control method for a large generating set. Background technique [0002] At present, more than 75% of the installed capacity of power generation equipment in my country is thermal power generation. According to statistics, raw coal for thermal power generation basically accounts for half of the total coal consumption, making it a veritable large coal consumer. With the development of the economy and the improvement of people's consumption level, the proportion of domestic electricity consumption has increased, and the peak and valley load of the power grid has become more and more serious. The load of the power grid can only be operated at full load in summer, and 3 / 4 to 1 / 2 time is at about 70% load operation, so improving the stability and economy of the unit at low load operation is an urgent problem to be solved. It is very important to meet the needs of p...

AI Technical Summary

Problems solved by technology

However, during the operation of the unit, the operating parameters often deviate from the set working conditions, such as changes in steam temperature and back pressure of the steam turbine, especially in the air-cooled units and combined heat and power units that are widely put into operation at present, the back pressure is affected by seasons, ambient temperature, Factors such as wind force, wind direction, humidity, and heating load vary greatly. Under the same power generation, the steam consumption rate of the unit varies greatly, which will cause a mismatch between the inlet steam volume of the unit and the main steam pressure. The phenomenon occurs, so that the third regulating valve or the fourth regulating valve of the steam turbine is often in a non-fully open state, which increases the throttling loss of the unit during sliding pressure operation, thereby reducing the economical efficiency of the unit

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