Thermal power generating unit loading control system and method based on continuously adjustable back pressure

Abstract

The invention belongs to the technical field of thermal power generating unit peaking, and particularly relates to a thermal power generating unit loading control system and a thermal power generating unit loading control method based on continuously adjustable back pressure. The system comprises a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a generator, a condenser, a circulation water pump, a control system, a condensate pump, a boiler, and a circulating water pump motor execution unit, and is characterized by further comprising a back pressure continuous adjustment system. The method includes the first step that a logical judgment unit in the control system judges a working situation of a unit, the second step that a back pressure protection sub-system enters an execution stage, the third step that a best back pressure sub-system enters the execution stage and the fourth step that a varying load control sub-system enters the execution stage. In terms of a wet cooling unit, by means of continuous adjustment of circulating water flow, back pressure of the unit can be changed and varying load control for the unit can be achieved to a certain extent. Therefore, the system and the method can change varying load operation characteristics and economical efficiency of the thermal power generating unit.

Description

technical field [0001] The invention belongs to the technical field of peak regulation of thermal power units, and in particular relates to a thermal power unit load control system and method based on continuously adjustable back pressure. Background technique [0002] In my country's energy structure layout, thermal power generation dominates, and there is a lack of power sources that can stabilize the random fluctuations of new energy power. With the large-scale development and utilization of wind power, solar power and other new energy power, the problems and contradictions faced by new energy power consumption have become more prominent. In order to ensure the safe, high-quality, and economical operation of the power system, the North China Power Grid has issued the "Implementation Rules for the Grid-connected Operation and Management of Power Plants in the North China Region" to assess the load and frequency tracking capabilities of grid-connected power plants. Require...

AI Technical Summary

Problems solved by technology

However, the large lag and large delay characteristics of the boiler side make it difficult for the change of the boiler side to keep up with the adjustment of the steam turbine side, and at present, the large-parameter thermal power units all use a once-through boiler, and the heat storage of the boiler side is much lower than that of the drum boiler, which is even more important. Limits the ability of thermal power units to achieve large-scale rapid load changes

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