Self-coupling cold source heat pump circulating device of low-temperature exhaust heat power generating system in low temperature exhaust steam condensation process

Abstract

The invention relates to the technical field of low-temperature exhaust heat power generation at low temperature, in particular to a self-coupling cold source heat pump circulating device of a low-temperature exhaust heat power generating system in the low temperature exhaust steam condensation process. The self-coupling cold source heat pump circulating device comprises a conventional low-temperature exhaust heat power generating heat circulation system, a heat pump type condenser which is arranged parallel with a water-cooled condenser is arranged at an exhaust steam outlet of a lower pressure cylinder of a steam turbine; a gaseous state working medium outlet of the heat pump type condenser is divided into three paths which respectively pass through a heat pump system compressor, wherein a first path passes through a heat pump condensed water heater, a second path passes through a heat pump deoxidized heater and a third path passes through a heat pump water feeding heater and then returns to a liquid state working medium input of the heat pump type condenser; the heat pump water feeding heater is arranged between a condensing water pump and a deaerator; the heat pump deoxidized heater is arranged on the deaerator; and the heat pump water feeding heater is arranged at a water feeding inlet of a water feeding pump and an exhaust heat boiler. The invention substantially improves the exhaust heat utilization efficiency of the low-temperature exhaust heat power generating system and enables the system to produce more power energy under the condition that exhaust heat sources are the same.

Description

Technical field: [0001] The invention relates to a device for improving the thermal cycle efficiency of low-temperature waste heat power generation, in particular to a self-coupling cold source heat pump cycle device for low-temperature waste heat power generation system exhaust steam condensation process for the purpose of reducing cold source loss and improving thermal cycle efficiency. Background technique: [0002] At present, the known low-temperature waste heat power generation thermodynamic cycle device adopts the Rankine cycle method, and its process is described as: the working medium absorbs the low-temperature waste heat of the flue gas in the waste heat boiler and raises the temperature at a constant pressure to form two low-pressure and high-pressure systems with different working capabilities. Steam; high-pressure steam enters the main steam port of the steam turbine to perform constant entropy work, and converts the heat energy carried by the steam into the mec...

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Problems solved by technology

Therefore, the latent heat of vaporization released by the condensation of exhaust steam is released into the ambient atmosphere through the cooling water, forming the heat sink loss in the Rankine cycle

[0004] As we all know, the purpose of the thermal cycle of the working medium for power generation is to convert the waste heat into electric energy. The biggest problem of the known low-temperature waste heat power generation system is that the thermal cycle efficiency is very low, generally between 22% and 25%, and the ineffective loss of the thermal cycle process is as high as 75%-78%, of which the loss of cold source released by the circulating cooling water into the ambient atmosphere is as high as 55%-65%. It can be seen that the loss of cold source in the thermodynamic cycle is the biggest constraint factor leading to the low efficiency of the Rankine cycle. Reducing the cold source loss in the thermodynamic cycle is the most effective way to improve the thermodynamic cycle efficiency of the low-temperature waste heat power generation system

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