FIELD: heating.
SUBSTANCE: when natural gas is prepared for burning in boiler, temperature of natural gas at the outlet of expansion engine is provided by control of gas expansion extent so that it is below dew point temperature of heavy carbohydrate fractions - gas condensate. Gas is sent through separator for separation of gas condensate. At least part of natural gas without heavy fractions is sent through heat exchanger for cooling of natural gas burning products in boiler down to the temperature below dew point of water vapours, which are produced in process of natural gas burning, with preparation of water condensate. System for preparation of natural gas for supply to consumer contains at least one expansion engine and electric generator connected to its shaft, at least one gas separator, which is connected with its inlet to at least one outlet of gas from expansion engine, and also at least one gas heat exchanger, which is connected with its inlet to the outlet of at least one gas separator. Outlet of expansion engine is connected to the inlet of reservoir, volume of which is selected based on conditions of gas condensate discharge, and reservoir gas outlet is connected with inlet of gas separator. Outlets of reservoir and gas separator by liquid are connected with reservoir for collection of gas condensate, which is installed at the lower level, and outlet of separator by gas is connected to gas heat exchanger for cooling of burning products and with inlet of chill removal unit, which is connected to refrigerator, and outlets of gas heat exchanger and unit of chill removal by gas are connected to units of boiler gas collection units.
EFFECT: increase of chill use efficiency.
10 cl, 2 dwg
