A GENERATION OF ELECTRIC POWER BY TURBO-EXPANSOR AND ELECTRIC CHARGING SYSTEM FOR ELECTRIC CAR USING WASTE PRESSURE IN CITY GAS PRESSURE EQUIPMENT

摘要

PURPOSE: Power generation by a turbo-expanding unit and an electricity charging system for an electric car and a plug-in hybrid car, using a waste pressure in city gas pressure equipment are provided so that the electricity is generated using the pressure difference of city gas when the pressure of the city gas is decreased in a turbo-expanding unit and thus the generated electricity is used as the electricity for charging an electric car or plug-in hybrid car. CONSTITUTION: An electricity charging system for an electric car and a plug-in hybrid car comprises a heat exchanger, a turbo expanding unit, a control system, a generator and a charging station. The heat exchanger is formed as a gas burner in order to be able to supplement the heat of city gas lost when the fixed pressure of the city gas is decreased. The turbo expanding unit lowers the pressure of the gas heated from the heat exchanger to a pressure of 3kPa~0.3MPa in a turbine. The turbo expanding unit and a reduction valve(13) are installed in parallel. The control system determines the allowable flow rate of the turbo expanding unit by the pressure difference of the gas. The control system comprises a gas control valve, which determines the inflow of the gas using the turbo expanding unit and a conventional reduction valve. The generator generates the electricity using the pressure difference of the city gas when the pressure of the city gas is reduced in the turbo expanding unit. The charging station receives the electricity generated by the generator and provides the electricity to an electric car and a plug-in hybrid car.