Power generation and refrigeration combined system

Abstract

The invention discloses a power generation and refrigeration combined system. A generator absorbs a low-grade heat source. An inlet of a turbine assembly is connected with a steam outlet of the generator. A power generator is driven by mechanical energy output by the turbine assembly to operate to generate electric energy and supply the electric energy to electric energy users. An outlet of the turbine assembly is connected with a steam inlet of an absorber. A solution outlet of the absorber is connected with an inlet of a pump, and an outlet of the pump is connected with a solution inlet of the generator. A solution outlet of the generator is connected with an inlet of a first throttle valve. An outlet of the first throttle valve is connected with an inlet of a separator. A steam outlet of the separator is connected with a hot side working medium inlet of a condenser. A hot side working medium outlet of the condenser is connected with an inlet of a second throttle valve. An outlet of the second throttle valve is connected with a refrigerant inlet of an evaporator, and a refrigerant outlet of the evaporator is connected with the steam inlet of the absorber to cool cold energy user fluid. A solution outlet of the separator is connected with an inlet of a third throttle valve, and an outlet of the third throttle valve is connected with a solution inlet of the absorber. The system provides the refrigerating capacity and ensures the generating capacity.

Description

technical field [0001] The invention relates to the technical field of power generation refrigeration equipment, in particular to a combined power generation and refrigeration system. Background technique [0002] In today's energy structure, there are a lot of low-grade waste heat that has not been fully utilized, such as: solar energy, geothermal energy, ocean energy, waste heat in industrial production and waste heat in the operation of thermal power equipment, etc. The waste of these low-grade waste heat further exacerbates environmental pollution and energy crisis. Therefore, it is necessary to adopt an advanced and efficient waste heat recovery system to make full use of this part of low-grade waste heat, thereby reducing the consumption of non-renewable energy, optimizing the energy consumption structure, reducing environmental pollution, and achieving the goal of energy saving and emission reduction. [0003] At present, the low-grade waste heat recovery and utiliza...

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Problems solved by technology

[0003] At present, the low-grade waste heat recovery and utilization methods that are widely used include single working fluid such as water vapor, carbon dioxide or organic working fluid. This cycle system is due to the phase change of the working fluid in the process of heat absorption by the heat source and heat release by the heat sink. The temperature remains constant, the temperature difference between the corresponding working fluid and the heat source and heat sink is large, and the irreversible loss is large

[0004] In the Kalina cycle using the mixture of ammonia as the working medium, the concentration of the mixture working medium changes during the process of heat absorption by the heat source and heat release by the heat sink, so that the temperature changes accordingly, and the temperature difference between the mixture working medium and the heat source and heat sink Smaller, showing better heat transfer matching characteristics, thereby improving heat transfer performance and reducing irreversible losses, but the working ability of ammonia water is not as good as lithium bromide aqueous solution, and the Kalina cycle cannot provide cold energy

[0005] The Goswami cycle also uses a mixture of ammonia water as the circulating working medium. In the cycle, the superheated ammonia gas expands in the turbine to do work, and the expanded and cooled ammonia gas enters the heat exchanger to absorb heat and refrigerate to provide cold energy. The Goswami cycle By adopting the sensible heat cooling of the exhaust gas of the turbine, the sensible heat of the gas is very small compared to the latent heat of phase change, so the cooling capacity of the system is poor

[0006] Some combined absorption power and refrigeration systems based on ammonia water, some of which divide the working fluid generated by the generator into two parts, one part is used for expansion in the turbine, and the other part is used for cooling through the condenser, throttle valve and evaporator To achieve refrigeration, this system uses the working fluid originally used for work as refrigeration, which significantly reduces the working capacity of the system

[0007] There are also some systems that pass the working fluid after the expansion work of the turbine into the condenser, throttle valve and evaporator in order to realize the combined cooling and power supply. It should be noted that the working fluid after the expansion work is cooled by normal temperature Water is cooled to a saturated liquid, its saturation pressure is affected by the ambient temperature, and the corresponding turbine back pressure increases significantly, thereby reducing the output work of the system; in addition, the evaporation temperature of the evaporator determines the saturation pressure of the refrigerant, which affects the absorber Compared with the single absorption power cycle, the absorber pressure of this combined cooling and power generation system is significantly reduced, so that the mass fraction of the working medium in the mixed fluid flowing out of the absorber at the same temperature decreases, and the corresponding occurrence The working medium separated from the device is reduced, thereby reducing the working capacity of the system

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