JPH08177712A - Carbon dioxide thermal power generation system - Google Patents

Abstract

PURPOSE: To carry out power generation with good efficiency while using external thermal power which is obtained by utilizing abundant geothermal energy by gasifying carbon dioxide insted of water by the geothermal energy, and supplying gasified gas to a thermal engine so as to carry out power generation. CONSTITUTION: A heat exchange pipe for circulating geothermal energy water which is out from a high temperature water tank 2 is provided in the evaporating tank 1 for carbon dioxide liquid, the carbon dioxide liquid is heated and gasified by geothermal energy water, and then gasified gas is led in the high temperature water tank 2. The geothermal energy water is supplied from a taking-in port 9 into the high temperature warer tank 2, gasified gas which is led into the water tank 2 is supplied to a heated boiler, fuel which is supplied from a fuel supplying port 10 is burnt, and then the gasified gas is heated. High temperature gas is supplied to a turbine 4 for work and a power generator 5 is driven. Gas after finishing work is refluxed to the evaporation tank 1 through a pump 6, a cooler 7, and a feed liquid pump 8.

Description

DETAILED DESCRIPTION OF THE INVENTION In the present invention, unlike the thermal power generation method using water, carbon dioxide is vaporized by geothermal heat instead of water and supplied to a heat engine to generate electric power, and heating by thermal power is usually used. . Also, general waste heat can be used. Since carbon dioxide has a larger atomic weight than water, it is advantageous in a heat engine having a speed such as turpin as an element, and it has a critical temperature of 31 ° C. and can be easily heated and vaporized by geothermal heat. As a result, the main source of energy required for power generation will be provided by heating to vaporized things, but if geothermal temperature is particularly high, heating is usually performed by thermal power. In this power generation system, the reduction of the back pressure of the turpin and the liquefaction reuse by compression cooling of carbon dioxide gas are performed integrally, but the heat associated with the liquefaction is not reused and is discarded by the cooler. Therefore, the back pressure of the turpin is determined by the required exhaust treatment energy. Carbon dioxide does not change even at high temperatures, has no corrosive properties, is stable, and can be obtained at low cost. According to this method, efficient power generation can be performed by using external heat power that can utilize abundant geothermal heat.

[Brief description of drawings]

FIG. 1 is a schematic diagram of this system. In FIG. 1, 1 is an evaporation tank for a carbon dioxide solution, which is vaporized by geothermal heat and is sent to a geothermal high temperature water tank 2. 3 is a boiler which is heated by thermal power and is supplied to the turpin of 4 to obtain electric power with a generator of 5. 6 is a pump for lowering the back pressure of the turpin, which is also used for compression. The liquid cooled and liquefied by the cooler of 7 is press-fitted into the evaporation tank 1 by the liquid feed pump of 8. Reference numeral 9 is an inlet for geothermal hot water, and 10 is an outlet after heating. 11 is a fuel supply port for high temperature heating.

Claims (1)

[Claims] 1. A method of heating carbon dioxide and supplying it to a heat engine to generate electricity.