Combined cycle peak and frequency regulation direct air cooling unit and operation method thereof

Abstract

The invention discloses a combined cycle peak and frequency regulation direct air cooling unit and an operation method thereof. The combined cycle peak and frequency regulation direct air cooling unit comprises a direct air cooling unit and a combined cycle system, wherein a water feeding inlet of the combined cycle system is connected with a water feeding outlet of a direct air cooling condensing steam turbine unit; power outputs of the direct air cooling unit and the combined cycle system are connected with a power grid; and the adjustment means and capacity of the direct air cooling unit are increased, the fluctuation frequency of a steam admission adjusting valve of the steam turbine of the direct air cooling unit is reduced, and the operation safety and economical efficiency of the direct air cooling unit are improved. In a combined cycle system, a boiler following coordination control mode CCS-BF is adopted, the combined cycle system is small in size, small in inertia, fast in load response, relatively small in front pressure fluctuation and relatively small in energy loss; and through an adjusting mode of combining the combined cycle CCS-BF and the direct air cooling unit CCS-TF, the contradiction between economic operation and peak and frequency regulation capacity of the direct air cooling unit is effectively relieved, and the regulation efficiency and the regulation safety of the direct air cooling unit in a future high-frequency sub-wide load application scene are improved.

Description

technical field [0001] The invention belongs to the field of power plant boiler and steam turbine systems, and in particular relates to a direct air-cooling unit for combined cycle peak regulation and frequency regulation and an operating 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 ...

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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 due to the large inertia and delay of the boiler, the operating stability of the unit is relatively poor, which is reflected in the large main steam pressure. The faster the unit responds to the load demand, the greater the fluctuation

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