TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: A part of the hot hydrogenated gas, under pressure is cooled at a temperature of 293-323 K. A part of the cooled hydrogenated gas is expanded at a pressure of 5.105 pa (5 bars). A part of the cooled hydrogenated gas is stored, as an intermediate, before the expanding step. The method further comprises filtering at least one part of the produced, expanded hydrogenated gas to remove at least one part of solid combustion residues. The filtering step is carried out before the expanding step, preferably before the cooling step. The method comprises producing hydrogenated gas, filtering at least one part of hydrogenated gas to remove at least one part of the solid combustion residues, cooling the part of the filtered hydrogenated gas, storing intermediate of the part of the filtered and cooled hydrogenated gas, and purifying the filtered and cooled hydrogenated gas. Preferred Components: The solid pyrotechnic charge is a pyrotechnic charge containing a pyrotechnic product containing 96 mass% of an inorganic oxidizing component and a hydrogenated reducing component consisting of inorganic hydrides, borazane and polyaminoboranes. The hydrogenated reducing component includes inorganic hydrides consisting of inorganic borohydrides, preferably alkali and alkaline earth metal borohydrides (comprising sodium borohydride, lithium borohydride and magnesium borohydride), and consists of borazane (preferred) and polyaminoboranes. The inorganic oxidizing component includes perchlorates, dinitro amides, nitrates and metal oxides, preferably ammonium perchlorate, ammonium dinitroamide, strontium nitrate and iron oxide. The pyrotechnic product contains: 40-80 mass%, preferably more than 70 mass% of hydrogenated reducing component and 20-60 mass%, preferably 25-45 mass% of inorganic oxidizing component.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The cooling unit is a serpentine-shaped heat exchanger. The expanding unit consists of flow expander and regulator. The device further comprises a tube arranged between the cooling unit and the expanding unit, and a gas filtering unit. The zeolite filter is a synthetic type A zeolite, preferably type 5 A zeolite.