Combined cycle peak and frequency regulation wet cooling unit and operation method thereof

Abstract

The invention discloses a combined cycle peak and frequency regulation wet cooling unit and an operation method thereof. The wet cooling unit comprises a wet cooling unit body and a combined cycle power generation system, the power output end of the wet cooling unit body and the power output end of the combined cycle power generation system are connected with a power grid, and a water supply inlet of the combined cycle power generation system is connected with a water supply outlet of the wet cooling unit body. A steam exhaust port of the combined cycle power generation system and a steam exhaust port of the wet cooling unit body are both communicated with a steam condensing device of the wet cooling unit body; the combined cycle power generation system is additionally arranged to assist peak and frequency regulation of a large machine, the regulation means and capacity of the wet cooling unit are increased, the fluctuation frequency of a steam inlet control valve of a steam turbine of the wet cooling unit is reduced, and the operation safety and economical efficiency of the unit are improved; and through the regulation mode of combining the combined cycle CCS-BF and the wet cooling unit CCS-TF, the contradiction between economic operation and peak and frequency regulation capacity of the wet cooling unit is effectively relieved, the regulation efficiency and the regulation safety of the wet cooling unit in a future high-frequency wide load application scene are improved, and huge energy-saving potential is achieved.

Description

technical field [0001] The invention belongs to the field of power plant boiler and steam turbine systems, and in particular relates to a wet-cooling unit for combined cycle peak regulation and frequency regulation and an operation method thereof. Background technique [0002] The conventional automatic control system controls the boiler and the steam turbine separately. Generally, the steam turbine adjusts the speed and load of the unit, and the boiler adjusts the main steam pressure. Looking at boilers and steam turbines from the perspective of control, boilers are objects with large time constants and slow changes, while steam turbines are objects with small time constants and fast changes. With the continuous increase of the capacity of the unit unit, the increase of the grid capacity and the improvement of the frequency regulation and peak shaving requirements of the power grid, the conventional control system is difficult to meet the requirements of the thermal power u...

AI Technical Summary

Problems solved by technology

The characteristics of the two are different. The former has a poor load response, but the unit operates stably; the latter has a fast load response, but the energy loss is too large. Due to the large inertia and delay of the boiler, the unit’s operation stability is relatively poor, which is manifested in the main steam The pressure will fluctuate greatly. The faster the unit responds to the load demand, the greater the fluctuation range and the greater the valve adjustment loss.

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