Heat recovery steam generator and methods of coupling same to combined cycle power plant
A technology of steam generator and combined cycle, applied in the field of heat recovery steam generator and connecting it to combined cycle power plant, which can solve the problem of total efficiency of combined cycle power plant
Inactive Publication Date: 2013-04-24
GENERAL ELECTRIC CO
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Problems solved by technology
[0004] Although a heat recovery steam generator efficiently extracts heat energy from the exhaust gas of a gas turbine in order to generate steam to drive one or more steam turbines, a variety of heat exchange component arrangements and ways of connecting to other components of a combined cycle power plant Does not bring combined cycle power plants to maximum possible overall efficiency
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[0013] Figure 1 depicts a typical prior art heat recovery steam generator 100 connected to components of a combined cycle power plant. As shown, the gas turbine 20 includes a compressor section 22 , a combustor section 24 , and a turbine section 26 . All or a portion of the exhaust gas from turbine section 26 is routed to inlet 101 of heat recovery steam generator 100 .
[0014] The combined cycle power plant also includes a high pressure steam turbine 30 that receives steam from the heat recovery steam generator 100 at an inlet 32 . Exhaust steam from the high pressure steam turbine 30 exits the high pressure steam turbine 30 at an outlet 34 and the steam is sent back to the heat recovery steam generator 100 . Some combined cycle power plants also include low and / or intermediate pressure steam turbines 40 . The inlet 43 of the low / medium pressure steam turbine 40 also receives steam from the heat recovery steam generator 100 . The output of the low / medium pressure steam ...
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A heat recovery steam generator uses heat energy extracted from the exhaust gas of a gas turbine to produce steam. The steam is provided to steam turbines of a combined cycle power plant. Intermediate pressure steam generated by an intermediate pressure evaporator is routed to first and second intermediate pressure superheaters. Also, steam exhausted from a high pressure steam turbine of a combined cycle power plant is reheated by first and second reheaters within the heat recovery steam generator. The steam output by the intermediate pressure superheaters is provided to an interstage admission port of an intermediate pressure steam turbine, and steam output by the first and second reheaters is provided as the main input steam for the intermediate pressure steam turbine of the combined cycle power plant.
Description
Background technique [0001] Combined cycle power plants in the power generation industry use one or more gas turbines and one or more steam turbines to drive one or more generators to generate electricity. The exhaust of the gas turbine is used as a heat source to generate steam that drives one or more steam turbines. One or more heat recovery steam generators extract thermal energy from the gas turbine exhaust and generate steam for the steam turbine. [0002] A typical heat recovery steam generator includes an inlet for receiving exhaust gas from the gas turbine, and an outlet exhausting the gas received from the gas turbine after extracting thermal energy from the exhaust gas. Located between the inlet and the outlet is a flow path in which a plurality of heat exchanger devices are positioned. The heat exchanger arrangement extracts heat from the exhaust gas of the gas turbine as it flows from the inlet to the outlet. [0003] Multiple heat exchanger devices within a hea...
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IPC IPC(8): F22B1/18F22B31/08
CPCY02E20/16F01K7/18F01K23/14F01K23/106F01K7/22Y10T29/49826Y10T29/49229
Inventor H.拉贾K.蒙德拉J.斯霍尔斯V.姆
Owner GENERAL ELECTRIC CO