Two-stage transcritical Rankine cycle power generation system using geothermal energy

A Rankine cycle and power generation system technology, which is applied in the direction of machines/engines, steam engine devices, mechanical equipment, etc., can solve the problems of cost increase and cost increase, and achieve the effect of improving output power, easy control, and high output power

Active Publication Date: 2017-05-10
DALIAN UNIV OF TECH
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Problems solved by technology

[0004] For the relatively new two-stage evaporative Rankine cycle, although the output power and thermal efficiency have been improved, but due to the addition of heat exchangers or additional cycles, this improvement is at the cost of increased costs, so its cycle form remains to be seen. Further improvement, while increasing the cost, obtain greater output power

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  • Two-stage transcritical Rankine cycle power generation system using geothermal energy

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Embodiment

[0022] The heat source in this example adopts geothermal water with a pressure of 5 MPa and a temperature of 120°C, with a treatment capacity of 20kg / s. The temperature difference between the pinch points of the heater, the low-pressure working fluid heater and the high-pressure working fluid heater is 10°C, and the temperature difference between the pinch points of the condenser is 5°C.

[0023] Such as figure 1 Shown, concrete process step and process condition are as follows:

[0024] 1. The working medium liquid at the outlet of the condenser 10 is a saturated liquid (temperature 25°C, pressure 1.37MPa, flow rate 54.45kg / s), pressurized to supercritical pressure by the low-pressure working medium pump 1, the pressure is 3.69MPa, and the temperature is 27.44 ℃, the power consumption of the low-pressure working fluid pump 1 is 140.17KW.

[0025] 2. The working medium liquid and the geothermal water (flowing from the low-pressure working medium heater 4, the pressure is 0.5...

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Abstract

The invention discloses a two-stage transcritical Rankine cycle power generation system using geothermal energy and belongs to the field of geothermal energy power generation. The system comprises a low pressure working medium, a high pressure working medium, a preheater, a low pressure working medium heater, a high pressure working medium heater, a low pressure expander, a high pressure expander, a condenser, a separator and a mixer. The whole power generation process comprises two portions: low pressure transcritical Rankine cycle power generation and high pressure transcritical Rankine cycle power generation, so that the geothermal energy is fully utilized, the irreversible loss of the process is reduced, the exergy efficiency is greatly enhanced, the output power and thermal efficiency are further relatively high, and the system can be widely applied to the field of geothermal energy power generation.

Description

technical field [0001] The invention belongs to the field of generating electricity using geothermal energy, in particular to a two-stage transcritical Rankine cycle power generation system utilizing geothermal energy. Background technique [0002] In the case of increasingly serious energy crisis, the use of renewable energy is particularly important. If geothermal energy can be used economically and reasonably for power generation, it will greatly promote the development of geothermal resources, reduce the consumption of fossil fuels for power generation and the corresponding greenhouse gases , the emission of air pollutants, and provide important energy support for sustainable development. [0003] For the utilization of geothermal energy, the output work of the initial single-stage subcritical Rankine cycle is very low, in order to reduce There are two ways of improvement: one is to start with the working fluid, using a working fluid with excellent cycle performance or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01K27/00
CPCF01K27/00
Inventor 鲍军江张瑞祥林岩贺高红
Owner DALIAN UNIV OF TECH
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