Gas turbine generating system using flue gas waste heat organic hydrocarbon mixture

Abstract

The invention discloses a gas turbine generating system using a flue gas waste heat organic hydrocarbon mixture (such as n-pentane, isopentane, butane and the like). The system is characterized by comprising an organic hydrocarbon mixture-flue gas heat exchanger, an organic hydrocarbon mixture turbine engine, a power generator, a steam condenser and an organic hydrocarbon mixture condensing pump, wherein a working medium of the turbine engine is the organic hydrocarbon mixture; an organic working medium discharged from the organic hydrocarbon mixture turbine engine passes through a booster pump after being condensed and cooled in the steam condenser; and the organic working medium is pumped into the heat exchanger to be heated and evaporated and then enters the turbine engine to finish a closed circulation. The heat energy of the exhaust smoke is sufficiently used to reduce heat emission for atmosphere. After the temperature of the flue gas at an entrance of a desulfurization absorption tower is reduced, the evaporated water in the absorption tower is reduced and water consumption of a desulfurization process is correspondingly saved so that the purpose of saving water can be achieved.

Description

technical field [0001] The invention relates to a power generation system, in particular to an organic hydrocarbon mixture steam turbine power generation system utilizing flue gas waste heat. Background technique [0002] Smoke exhaust loss is the most important heat loss in boiler operation. The exhaust gas temperature of many boilers in thermal power plants in my country exceeds the design value. The design value of the exhaust gas temperature of boilers burning anthracite, lean coal, and bituminous coal is usually at 120~125℃, the design value of the exhaust gas temperature of the boiler burning lignite is usually around 155℃, and the flue gas volume is very large, and the flue gas volume at the outlet fan of a single 600MW unit can usually reach (300~400)×10 4 m 3 / h. In order to reduce the loss of exhaust gas, reduce the temperature of exhaust gas, save energy, and improve the economy of power plants, there are currently cases where low-temperature economizers are used...

AI Technical Summary

Problems solved by technology

Therefore, under the same assessment conditions, the dust collector after the flue gas heat exchanger, when the volume of the electrostatic precipitator body and dust collection area do not consider the lowering of the inlet flue gas temperature, the investment of the electrostatic precipitator will be lower than that of the conventional temperature electrostatic precipitator. has increased

[0015] 2) The heat exchange pipes in the flue gas heat exchanger are easy to accumulate dust, and the maintenance cost is high

[0016] 3) Since the flue gas is not dust-collected, it is easy to cause wear to the heat exchange pipes in the flue gas heat exchanger, and the operation risk is high

The length of the flue that requires anti-corrosion treatment is long, and the flue from the outlet of the flue gas heat exchanger to the inlet of the desulfurization device needs anti-corrosion treatment similar to the clean flue of desulfurization, and the cost is high

[0018] 5) The material selection of the heat exchange tube of the flue gas heat exchanger should not only consider the corrosion caused by the flue gas operating temperature around the dew point temperature, but also consider the wear caused by the flue gas not being dust-collected. The existing domestic materials are difficult to adapt to this harsh environment

[0020] In addition to the above problems, Layout 1 cannot make use of the temperature rise of the flue gas passing through the induced draft fan, and the income is poor

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