Combined cycle power plant
A combined cycle and power plant technology, applied in the direction of combined combustion mitigation, machine/engine, steam engine device, etc., can solve the problems of high exhaust temperature, difficult to control, limit the maximum use of energy in exhaust gas, etc., achieve high efficiency and easy control , the effect of reducing equipment requirements
Inactive Publication Date: 2018-09-04
NEM能量有限公司
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Problems solved by technology
The problem with this prior art arrangement is that heating the ORC fluid through two heaters in series and using the exhaust gas from the heater at the upper temperature level will result in high exhaust temperatures that are higher than those leaving the first ORC fluid heater ORC fluid temperature
This limits the maximum use of energy in the exhaust
This design is not easy to control because the operation of the two heat sources is related to each other when the evaporating temperature varies with pressure, especially at part load
Method used
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Embodiment Construction
[0023] Such as figure 1 The illustrated combined cycle power plant having a gas turbine cycle 20 and an organic Rankine cycle 10 is well known. Here, a multi-shaft gas turbine with three compressor stages 21 , 22 and 23 compresses the air for the combustor 25 in three steps before the compressed air is mixed with fuel and ignited. The exhaust gases are then expanded in four turbine stages 24, 24', 24" and 24"'. The generator G2 is connected to the power turbine 24''. To avoid that the energy of the exhaust gases from the last turbine stage would be emitted into the atmosphere, a Rankine cycle was added, or in this example an organic Rankine cycle 10. Organic Rankine The cycle 10 comprises a turbine 11 fed by fluid heated in an exhaust gas heat exchanger 12. Furthermore, a pump 13 and a condenser 15 are arranged within the organic Rankine cycle 10. Finally, the turbine 11 drives a first generator G1.
[0024] figure 2 A schematic view of a prior art combined cycle power pla...
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The present invention relates to a combined cycle power plant according to claim 1, comprising an Rankine cycle (10) with a turbine (11), an exhaust gas heat exchanger (12), a pump (13), a condenser (15) and a first generator (G1) driven by the turbine (11); a multi shaft gas turbine cycle (20) with at least two compressor stages (21, 22, 23), a combustor (25), at least one turbine stage (24, 24 ', 24'', 24''') and a second generator (G2) driven by the at least one turbine stage (24, 24 ', 24'', 24'''); wherein in a compressing air path between two compressor stages (21, 22, 23) an intercooler(27, 28) is arranged such that a temperature of the compressed air for the combustor (25) is decreased. The cold side path from the intercooler (27, 28) is connected in parallel to the exhaust gas exchanger (12) of the Rankine cycle (10), such that the waste heat from the intercooler (27, 28) is feeding the Rankine cycle in addition to the exhaust gas heat from the exhaust gas heat exchanger (12).
Description
technical field [0001] The invention relates to a combined cycle power plant according to claim 1 . Background technique [0002] Simple cycle gas turbine power plants have relatively low efficiency and high exhaust gas temperatures (400 to 600°C). Consequently, a significant portion of the fuel energy is dumped and not converted into the desired form of electrical energy. Therefore, simple cycle gas turbine power plants are less suitable for baseload generation. But the high temperature of the exhaust gas allows the use of heat recovery techniques in order to increase the efficiency of the overall plant. figure 1 An example for such a combined cycle power plant is shown in , where the gas turbine cycle is combined with a bottom Rankine cycle or in particular an Organic Rankine cycle (ORC). [0003] The most commonly used in combined cycle power plants is the bottom Rankine cycle used to recover energy from exhaust gases. Such Rankine cycles are generally based on water ...
Claims
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IPC IPC(8): F01K23/10F01K25/08F01K7/32
CPCF01K7/32F01K23/10F01K23/101F01K25/08Y02E20/16F05D2220/72
Inventor G·埃尔萨科特
Owner NEM能量有限公司