Energy self-supplying type carbon dioxide cold and hot electricity co-generation system used for low-grade heat source

Abstract

The invention discloses an energy self-supplying type carbon dioxide cold and hot electricity co-generation system used for a low-grade heat source. The energy self-supplying type carbon dioxide coldand hot electricity co-generation system comprises a transcritical carbon dioxide reheat Rankine dynamic cycle system and a transcritical carbon dioxide injection refrigeration cycle system; the energy self-supplying type carbon dioxide cold and hot electricity co-generation system integrates reheat Rankine dynamic cycle and injection refrigeration cycle, adopts carbon dioxide as a single workingmedium, converts low-grade heat energy to useful work through a extraction turbine of the transcritical carbon dioxide reheat Rankine dynamic cycle system and supplies the heat energy to users by using a water heater. The transcritical carbon dioxide injection refrigeration cycle system utilizes high-pressure exhaust waste heat of the extraction turbine to drive an injector to output cold energy to the users. Through reasonable arrangement of the system, the system can output more electric energy. By adoption of a working medium pump and a low-pressure-ratio gas compressor, the energy self-supplying type carbon dioxide cold and hot electricity co-generation system reduces compression power efficiently during the system operation and improves net electric generation and conversion efficiency of the low-grade heat energy of the system.

Description

technical field [0001] The invention belongs to the technology of energy conversion and utilization, and in particular relates to an energy self-sufficient carbon dioxide combined cooling, heating and power generation system for low-grade heat sources. Background technique [0002] Facing the excessive use of traditional fossil fuels and the ensuing increasingly serious environmental pollution problems, the development and utilization of sustainable energy has become a hot research direction. Heat sources such as solar energy, geothermal energy, biomass energy, industrial low-temperature waste heat energy, and internal combustion engine exhaust heat energy are considered to be alternative energy sources that can meet the current continuously growing energy demand and reduce greenhouse gas emissions. Although the quantity of these low-grade thermal energy is large, the energy flow density is low, and the thermal energy conversion efficiency is not high during the utilization ...

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Problems solved by technology

[0006] Purpose of the invention: In view of the deficiency and low utilization efficiency of the low-taste heat source utilization system in the above-mentioned prior art, the present invention provides an energy self-sufficient carbon dioxide cogeneration system for low-taste heat sources

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