DEVICE FOR GAS SAMPLING IN HIGH-ENTHALPY PLANTS OF SHORT-TERM ACTION AND METHOD OF MEASURING FLOW GAS RATE WITH USE OF SAID DEVICE

摘要

FIELD: gas industry.;SUBSTANCE: invention relates to a technique of investigation of properties and composition of working gas in high-enthalpy plants of short-term action. Device for sampling gas in high-enthalpy plants of short-term action includes tightly connected sampler with sharpened front edge and expanding inner channel. Device also includes a pyro-valve, piston valve arranged in housing, a unit for connection of control of high-voltage wires for blasting powder charge and bypass opening in cylinder for gas collection and storage. Cylinder for collection of samples is equipped with a piston, and in channel of sampler there is a heat-conducting insert with a developed area of inner surfaces. Unit for connection of control of high-voltage wires for blasting powder charge is installed in wind shadow pyrotechnic valve and is additionally equipped with two-electrode system, and housing is provided with a drain hole to release pressure of powder gases. Method for determining gas flow rate with use of said device comprises evacuation of gas dynamic path and device cavities to a pressure of 10^-2 mmHg and through bypass port of sampler filled with a gas cylinder for sampling. Piston of cylinder is locked in far right position, and then sealed with overflow hole. Gas filled cylinder is allowed to cool to room temperature T_b, cylinder pressure is measured using a pressure gauge or pressure sensor. Knowing value of cylinder volume V and bypass opening pressure p_b in cylinder cavity, time t_b = t_b2 - t_b1 stay in open position opening bypass, determined by mass of gas (G_b)_e, released to tank in a time t_b (G_b)_e=Vp_b/(RT_b), where R - specific gas constant, t_b1, t_b2 - start and end of cylinder filling, calculate estimated value of mass that must sag in bottle for a time t_b.;EFFECT: invention provides high reliability of gas sample, preservation of cylinder, and also provides possibility of simultaneous measurement of gas flow rate.;3 cl, 1 dwg