Transcritical carbon dioxide power cycle and absorption heat pump combined heat and power cogeneration system for high temperature flue gas waste heat recovery

Abstract

The invention discloses a CO2 power cycle and absorption heat pump combined heat and power cogeneration system for high temperature flue gas waste heat recovery. The CO2 power cycle and absorption heat pump combined heat and power cogeneration system realizes combined heat and power cogeneration by integrating high and low temperature power cycle and absorption heat pump cycle. The power cycle uses CO2 as the working medium, the endothermic process is located at the supercritical pressure, the exothermic process to a cold source is located at the subcritical pressure, and a transcritical cycleform is achieved. The high-temperature power cycle uses high-temperature flue gas as a heat source, and the low-temperature power cycle absorbs heat from dead steam of the high-temperature power cycle. An absorption heat pump system uses low-temperature power cycle high-temperature dead steam as a driving heat source and a low-temperature dead steam as a low temperature heat source, the waste heat resources are fully used as far as possible, and the COP of the absorption heat pump cycle is increased. The CO2 power cycle and absorption heat pump combined heat and power cogeneration system improves the heat exchange matching between the circulation and the variable temperature heat source, effectively utilizes the recycled dead steam heat, realizes the cascade utilization of different tasteresidual heat energy, and improves the overall energy utilization efficiency of the system.

Description

technical field [0001] The invention relates to the energy-saving technical field of power machinery and heat pumps for waste heat utilization, in particular to a transcritical CO 2 Combined heat and power system combined with power cycle and absorption heat pump. Background technique [0002] Use appropriate technology to effectively recover and utilize high temperature (>500 °C) produced in industrial production o C) Flue gas waste heat can achieve good economic and social benefits. According to the principle of energy cascade utilization, power recovery and heat utilization can be carried out in sequence for the waste heat of medium and high-grade flue gas. The current waste heat power recovery technologies mainly include the traditional water Rankine cycle, organic working medium cycle and Karina cycle. The organic working medium cycle and the Karina cycle are suitable for waste heat recovery at low and medium temperatures. Under high temperature conditions, there...

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Problems solved by technology

[0005] The object of the invention is to provide a transcritical CO 2 Combined heat and power cogeneration system combined with power cycle and absorption heat pump can solve the problem of conventional CO generation under variable temperature heat source 2 The power cycle has problems such as insufficient utilization of heat sources and low overall system efficiency. Improve the heat exchange matching between the cycle and the variable temperature heat source, effectively use the sensible heat of the power cycle heat release process, and further improve the overall thermal energy utilization efficiency of the system.

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