초록 ▼

Some power plants may produce both power and process steam as output products and may be referred to as cogeneration power plants. This type of power plant may include at least one extraction type steam turbine in order to conveniently output process steam. Sometimes the available power plant steam

Some power plants may produce both power and process steam as output products and may be referred to as cogeneration power plants. This type of power plant may include at least one extraction type steam turbine in order to conveniently output process steam. Sometimes the available power plant steam supply is insufficient to satisfy both load demand and process steam requirements whereupon it may be desirable to prefer load demand over process steam requirements. The present invention is a control system for electronically implementing that preference.

대표청구항 ▼

A method for controlling the operation of an extraction steam turbine in accordance with a minimum inlet steam pressure; said extraction steam turbine including inlet valve means and extraction valve means; and, said method comprising the steps of: positioning said inlet valve means and said extract

A method for controlling the operation of an extraction steam turbine in accordance with a minimum inlet steam pressure; said extraction steam turbine including inlet valve means and extraction valve means; and, said method comprising the steps of: positioning said inlet valve means and said extraction valve means in accordance with speed and extraction pressure error signals whenever the inlet steam pressure exceeds the minimum inlet steam pressure; positioning said inlet valve means in accordance with an inlet pressure signal whenever the inlet steam pressure falls below the minimum inlet steam pressure; and, positioning said extraction valve means in accordance with an inlet pressure signal and a speed signal whenever the inlet steam pressure falls below the minimum inlet steam pressure.