Evaluation device and method for heat exchange efficiency of supercritical carbon dioxide in geothermal system

Abstract

The invention discloses an evaluation device and method for the heat exchange efficiency of supercritical carbon dioxide in a geothermal system. The evaluation device comprises a carbon dioxide storage tank, a heating device and a constant high temperature and high pressure device; the carbon dioxide storage tank is sequentially connected with the heating device, a constant speed and constant pressure pump, the constant high temperature and high pressure device and a waste gas recycling tank, a pressure sensor, a temperature sensor and a flowmeter are arranged between the constant speed and constant pressure device and the constant high temperature and high pressure device, and a pressure sensor, a temperature sensor and a flowmeter are arranged between the constant high temperature and high pressure device and the waste gas recycling tank; and the device further comprises a computer system, and the pressure sensors, the temperature sensors and the flowmeters are all connected with thecomputer system. The device has the advantages of being high in automation degree and control precision, achieves synchronous data acquisition and data analysis and can evaluate the heat exchange efficiency of supercritical carbon dioxide in real time.

Description

technical field [0001] The invention relates to the field of thermal energy conversion, in particular to a heat exchange efficiency evaluation device and method for supercritical carbon dioxide in a geothermal system. Background technique [0002] As a clean and renewable energy, geothermal energy has abundant reserves and broad application prospects. Enhanced geothermal system (EGS) is an artificial geothermal system that creates an artificial heat storage and exploits geothermal energy in hot dry rock mass with high temperature but no water or no permeability through hydraulic fracturing and other methods. At present, water is mostly used as the working medium at home and abroad, and geothermal resources are exploited from the geothermal system by means of one injection and one extraction (cold water is injected into the water injection well, and hot water or steam is extracted from the production well). In 2000, DW Brown proposed the Enhanced Geothermal System (EGS) to u...

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Problems solved by technology

[0004] At present, there are few experimental devices for research on the heat transfer efficiency of supercritical carbon dioxide in enhanced geothermal systems, and the degree of automation is low, with large experimental errors and insufficient precision.

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