A wet cooling unit with combined cycle peak regulation and frequency regulation and its operation method

Abstract

The invention discloses a wet cooling unit with combined cycle peak regulation and frequency regulation and an operation method thereof. Connected to the water supply outlet of the wet cooling unit, the steam exhaust port of the combined cycle power generation system and the steam exhaust port of the wet cooling unit are connected to the steam condensing device of the wet cooling unit. It can reduce the fluctuation frequency of the steam inlet valve of the wet cooling unit, and improve the safety and economy of the unit operation; through the combination of the combined cycle CCS‑BF and the wet cooling unit CCS‑TF, the adjustment mode of the wet cooling unit can effectively alleviate the economic operation and the wet cooling unit. The contradiction between peak regulation and frequency regulation capabilities improves the regulation efficiency and regulation safety of wet cooling units in the future high-frequency and wide-load application scenarios, and has huge energy-saving potential.

Description

technical field [0001] The invention belongs to the field of power station boilers and steam turbine systems, in particular to a wet cooling unit with 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 respectively. Generally, the steam turbine adjusts the speed and load of the unit, and the boiler adjusts the main steam pressure. Observe the boiler and the steam turbine from the control point of view, the boiler is an object with a larger time constant and a slower change, while the steam turbine is an object with a smaller time constant and a faster change. With the continuous increase of unit capacity, the increase of power grid capacity and the increase of power grid frequency and peak regulation requirements, conventional control systems are difficult to meet the requirements of thermal power units to respond quickly to ...

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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