Efficient waste heat power generation system

Abstract

The invention discloses an efficient waste heat power generation system which comprises a combustion system, a tail gas treatment device, a power generation system and a cooling system. The combustionsystem comprises a preheater, a first-stage combustion furnace, a second-stage combustion furnace and a heat exchange furnace. A gas inlet of the preheater is connected with a gas outlet of a boiler.A gas outlet of the preheater is connected with a gas inlet of the first-stage combustion furnace. A gas outlet of the first-stage combustion furnace is connected with a gas inlet of the second-stagecombustion furnace. A gas outlet of the second-stage combustion furnace is connected with a gas inlet of the heat exchange furnace. A gas outlet of the heat exchange furnace is connected with a gas inlet of the tail gas treatment device. The power generation system comprises an economizer, a steam pocket, an evaporator, a superheater, a steam turbine and an expansion generator connected with thesteam turbine. A gas inlet of the economizer is connected with a gas outlet of the tail gas treatment device. A gas outlet of the economizer is connected with a gas inlet of the steam pocket. A gas outlet of the steam pocket is connected with a gas inlet of the evaporator. A gas outlet of the evaporator is connected with a gas inlet of the superheater. A gas outlet of the superheater is connectedwith a gas inlet of the steam turbine. A gas outlet of the steam turbine is connected with the cooling system.

Description

technical field [0001] The invention relates to a high-efficiency waste heat power generation system. Background technique [0002] Flue gas waste heat resource loss is the most important waste heat resource loss, accounting for 60% to 70% of boiler waste heat resource loss. How to effectively recover and utilize the waste heat of flue gas is of great significance. In the existing technology, there is a scheme of using the technology of "waste heat boiler + steam turbine" to recover and utilize the waste heat of flue gas. However, this kind of scheme is to recover the waste heat of high-temperature flue gas For the transformation of power generation technology, there is still no effective waste heat recovery and utilization method for flue gas with a flue gas temperature lower than 300C, or with a small amount of flue gas and less waste heat. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a high-efficiency wast...

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Problems solved by technology

How to effectively recover and utilize the waste heat of flue gas is of great significance. In the existing technology, there is a scheme of using the technology of "waste heat boiler + steam turbine" to recover and utilize the waste heat of flue gas. However, this kind of scheme is to recover the waste heat of high-temperature flue gas For the transformation of power generation technology, there is still no effective waste heat recovery and utilization method for flue gas with a flue gas temperature lower than 300C, or with a small amount of flue gas and less waste heat

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