摘要:
A method of operating a fossil fuel-fired power generation system (10, 10', 10", 10'") in order to thereby optimize the operating efficiency thereof. The fossil fuel-fired power generation system (10, 10', 10", 10'"), which may or may not include an SCR (56), includes at least a fossil fuel-fired steam generator (12) having a burner region (16) wherein there is effected the combustion of fossil fuel and air such that gases of combustion are produced therefrom, a first heat transfer surface (32) located downstream of the burner region (16) of the fossil fuel-fired steam generator (12), a bypass (44,58,64) around the first heat transfer surface (32,32a), an air preheater (14) located downstream of the first heat transfer surface (32,32a), first and second flow paths from the burner region (16) of the fossil fuel-fired steam generator (12) to the air preheater (14) for the gases of combustion, a sensor (54) for sensing the temperature of the gases of combustion exiting from the air preheater (14), and when an SCR (56) is included a sensor (55) for sensing the temperature of the gases entering the SCR (56).
摘要:
There is provided a waste heat recovery system characterized by a boiler assembly including a heat recovery steam generator through which exhaust gas is flowed. The boiler assembly includes a high temperature steam tube heat exchanger, or superheater, and at a location downstream therefrom a water tube boiler. An ammonia gas injector is utilized for injecting ammonia into the exhaust gas stream which injector is located upstream of the superheater and water tube boiler. Finally, there is provided a low temperature selective catalytic reduction unit located downstream of the low temperature water tube boiler or evaporator. This arrangement simplifies retrofitting of existing heat recovery systems.
摘要:
A steam boiler which includes a rear flue containing superheaters, reheaters, economizers and the like, a plurality of gas passages, and one or more dampers for regulating the flow of gases passing through the plurality of gas passages. In this arrangement, a gas mixer is provided to evenly mix the gases at the outlets of the gas passages.
摘要:
A combined cycle plant (10) including: a gas turbine engine (12) having a compressor (14), a combustor and a gas turbine (16); a heat recovery steam generator (20) (HRSG) configured to receive exhaust from the gas turbine engine; a steam turbine (22, 24) configured to receive steam from the HRSG; a supplemental air arrangement (40) configured to generate supplemental heated air (42) when operating and to operate independent of the gas turbine engine; and a kettle boiler (26, 28) configured to use heat from the supplemental heated air to generate steam used in the steam turbine
摘要:
Provided is a method for operating a pulverized coal-fired boiler facility, wherein upgraded low-grade coal can be safely used as fuel and an existing facility needs little remodeling. The present invention relates to a method for operating a pulverized coal-fired boiler facility (100) that uses upgraded brown coal as fuel. Boiler exhaust gas taken out of an exhaust gas duct (31) is added to air from a primary air fan (10) to prepare mixed gas with an oxygen concentration of less than 12% in a volume ratio, the mixed gas is caused to separately flow to a carrier gas duct (33) that goes through a GAH (8) and a bypass carrier gas duct (34) that bypasses the GAH (8), and thereafter the mixed gas is supplied to a mill (21).
摘要:
A power-generating device using an organic Rankine cycle uses heat recovered from an exhaust gas treated in an exhaust gas treatment device, the power-generating device including a heat exchanger, an evaporator, a steam turbine, a power generator, a condenser, and a medium pump.
摘要:
A water recirculation system for a steam power plant includes a tapoff line which receives water from a downcomer, and an economizer link which receives water from the tapoff line and transports the water to an economizer.
摘要:
A method of operating a gas turbine power plant including an auxiliary power output for reducing power plant emissions. A heat recovery steam generator receives an expanded working medium from a gas turbine and removes heat from the expanded working medium to form a reduced temperature exhaust gas and to generate steam from the heat removed from the expanded working medium. A steam turbine and generator assembly operates on the steam to produce an auxiliary plant output. A selective catalytic reduction (SCR) system is provided for receiving the reduced temperature exhaust gas; and an auxiliary fan is powered by the auxiliary plant output to supply dilution air for further reducing the temperature of the exhaust gas to prior to passing the exhaust gas through the SCR system.
摘要:
Methods for removing acid gases and recovering water from flue gas. A flue gas is introduced into a water spray tower and is cooled by direct contact with a sprayed aqueous stream to condense a portion of the water vapor in the flue gas. Acid gases present in the flue gas are absorbed into the aqueous mixture, and a chemical added to the stream facilitates conversion of absorbed acid gases. The aqueous stream leaving the spray tower is next treated to remove contaminants, such as carbonates and bicarbonates, thereby producing a cleaned aqueous stream that may be split into a stream that is cooled prior to reuse in the spray tower, as well as a stream that is fed back to the boiler.
摘要:
A power plant is provided including a steam power plant and/or a combined cycle power plant. A water steam cycle of the plant includes two steam turbine arrangements; the first turbine arrangement includes steam turbines with at least two pressure levels and a second turbine arrangement having at least one back pressure turbine configured to expand steam to the supply pressure of a CO2 capture system. A method for operating the plant includes operating the first steam turbine arrangement to produce power during all steady state operating points of the steam cycle and at least a part of the second steam turbine arrangement is bypassed to the system and/or is operated to produce power and to release low-pressure steam to the system when the system is in operation. Both steam turbine arrangements are operated using all available steam to produce power when the system is not in operation.