초록 ▼

A gas and steam turbine plant includes a steam turbine having a water-steam loop. A waste heat boiler which is connected downstream of a gas turbine includes a high-pressure preheater connected in the water-steam loop, a high-pressure heater connected downstream of the high-pressure preheater, a low

A gas and steam turbine plant includes a steam turbine having a water-steam loop. A waste heat boiler which is connected downstream of a gas turbine includes a high-pressure preheater connected in the water-steam loop, a high-pressure heater connected downstream of the high-pressure preheater, a low-pressure heater connected upstream of the high-pressure preheater, and an evaporator of a medium-pressure heater. A coal gasification plant is connected upstream of the gas turbine. An outflow line leads into the coal gasification plant and is connected to the water-steam loop downstream of the high-pressure preheater, as seen in water flow direction. A water-steam drum communicates with the outflow line and is connected to the evaporator. A method for operating the plant includes generating steam for the steam turbine with working fluid expanded in the gas turbine. A partial quantity of preheated water at high pressure is drawn from the water-steam loop of the steam turbine and cools coal gas, when coal gas is used as fuel for the gas turbine. The drawn partial quantity is expanded and steam being formed in the process is superheated at medium pressure, both in partial-load operation and when natural gas is used as fuel for the gas turbine. Water remaining in the expansion is evaporated at medium pressure.

대표청구항 ▼

A method for operating a gas and steam turbine plant having a gas turbine and a steam turbine with a water-steam loop, whereby the gas turbine is selectively fueled with coal gas or natural gas, which comprises: generating steam for the steam turbine with working fluid expanded in the gas turbine; d

A method for operating a gas and steam turbine plant having a gas turbine and a steam turbine with a water-steam loop, whereby the gas turbine is selectively fueled with coal gas or natural gas, which comprises: generating steam for the steam turbine with working fluid expanded in the gas turbine; drawing a partial quantity of preheated water at high pressure from the water-steam loop of the steam turbine; when coal gas is used as fuel for the gas turbine, cooling the coal gas with the partial quantity for forming steam for the steam turbine; when natural gas is used as fuel for the gas turbine, expanding the drawn partial quantity and forming medium pressure steam, and superheating the medium pressure steam at medium pressure for forming superheated steam; recycling the superheated steam to the water-steam loop of the steam turbine; and evaporating water remaining in the expanding step at medium pressure for forming additional steam at medium pressure.