Thermodynamic system for combined heat recovery of power plant

Abstract

The invention discloses a thermodynamic system for combined heat recovery of a power plant. A smoke heat recovery system and a small exhaust system of turbine driven equipment are optimized for combined recovery. The technical scheme is as follows: the system comprises a fan exhaust afterheat recovery heater located on the fan side, a drainage pump and a smoke afterheat recovery device, wherein steam in a thermodynamic cycle system of the power plant is accessed into a regenerative driving steam turbine on the fan side to act; exhaust steam of the regenerative driving steam turbine enters the fan exhaust afterheat recovery heater, and the exhaust afterheat is utilized by the fan exhaust afterheat recovery heater to heat the water for heating; the drainage pump is connected with a water pipe at the outlet of the fan exhaust afterheat recovery heater or a water pipe at the inlet of the fan exhaust afterheat recovery heater for returning the water to the outlet or inlet of the fan exhaust afterheat recovery heater; and the smoke afterheat recovery device is used for receiving the water for heating at the outlet of the heater in the thermodynamic cycle system of the power plant and exchanging heat with the smoke.

Description

technical field [0001] The invention relates to an energy recovery technology, in particular to a technology for combining waste heat such as flue gas and exhaust steam of a regenerative driving steam turbine in a power plant, and recovering it to a regenerative system. Background technique [0002] Waste heat refers to the sensible heat and latent heat that have not been rationally utilized in the original design in the energy-consuming devices of industrial enterprises that have been put into operation due to the limitations of history, technology, ideas and other factors. It includes waste heat of high-temperature exhaust gas, waste heat of cooling medium, waste heat of waste steam and waste water, waste heat of high-temperature products and slag, waste heat of chemical reaction, waste heat of combustible waste gas and liquid, waste heat, etc. [0003] At present, the waste heat loss of exhaust smoke and exhaust steam of generator sets in my country is relatively large, w...

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Problems solved by technology

[0010] The purpose of the present invention is to solve the above problems. It provides a combined heat recovery thermal system of a power plant. It optimizes and recycles the flue gas heat recovery system and the small machine exhaust system of steam-driven equipment, improves the exhaust system, and solves the problem of Problems such as large pressure fluctuations in the deaerator, difficult exhaust pipe layout, heat loss, complex operation control methods, single flue gas heat recovery function, and high possibility of low-temperature corrosion have been solved.

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