Cooling, heating and power combined supply system based on double-pressure organic Rankine cycle

Abstract

The invention discloses a cooling, heating and power combined supply system based on a double-pressure organic Rankine cycle. The cooling, heating and power combined supply system comprises a low-pressure working medium pump, a low-temperature heat regenerator, a high-pressure working medium pump, a high-temperature evaporator, a high-pressure expander, a low-pressure expander, a first condenser, a low-temperature evaporator, a high-temperature heat regenerator, a generator, a compressor, a second condenser, a throttling valve, a refrigeration evaporator and a transmission device. According to the cooling, heating and power combined supply system, the low-grade heat energy is adopted for supplying drive force, the high-pressure expander is utilized for driving the compressor in the refrigeration cycle, and the cooling capacity is provided through air cooling; the low-pressure expander is utilized for driving the generator to provide electric energy; and the high-temperature heat regenerator further absorbs the energy in a low-grade heat source, and domestic hot water is provided. According to the system, cooling, heating and power combined supply can be achieved, and the utilization efficiency of the low-grade heat energy is improved.

Description

technical field [0001] The invention relates to a cooling, heating and power cogeneration system, in particular to a system for simultaneously producing cooling, heating and power by utilizing low-temperature heat sources or industrial waste heat, and belongs to the technical field of low-temperature recovery and power. Background technique [0002] Low-grade thermal energy generally refers to low-temperature heat sources with a temperature lower than 230°C. There are many types of these thermal energies, including new energy sources such as solar energy and geothermal energy, and various waste (waste) heat. The amount of low-grade heat energy is extremely large, and a large amount of low-temperature waste heat is generated in the production process of steel, cement, petrochemical and other industries, including hot water, low-grade flue gas and steam, etc. These low-temperature waste heat accounts for about 50% of the total industrial waste heat . . However, low-grade the...

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Problems solved by technology

However, this system needs to consume high-grade electric energy, and discharges a large amount of condensation waste heat to the environment during the condensation process, which not only causes energy waste, but also causes serious heat island effect to surrounding areas

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