54 results about "Hydrogen valve" patented technology

The invention provides a preparation method of ultra-high-purity aluminum, which comprises the following steps that 1, vacuum distillation is carried out on an aluminum ingot is carried out, and aluminum is taken out after cooling; 2, a glassy carbon boat or a boron nitride boat is treated with aqua regia; 3, the aluminum obtained in the step 1 is molten in a high-purity graphite crucible, and the molten aluminum is poured into the glassy carbon boat or the boron nitride boat to be cooled to obtain the aluminum ingot; 4, the aluminum ingot is corroded with an acid solution; 5, the aluminum ingot is put into a quartz tube of a zone melting furnace; 6, inert gas is introduced into the quartz tube for a period of time, a valve is closed, a hydrogen valve is opened, and hydrogen is introduced into the quartz tube; 7, a heater is turned on, and the temperature is adjusted; 8, when the heater moves to the tail of the boat, heating is stopped, the heater returns to the original point, and secondary zone melting operation is carried out; 9, after zone melting is completed, heating is stopped, the aluminum ingot is taken out, and the head and the tail of the aluminum ingot are removed; and 10, the obtained aluminum product is operated again according to the fourth step to the ninth step, and MBE-level 6.5 N ultra-high-purity aluminum can be obtained.

The invention relates to a negative pressure auto-ignition method for a hydrogen chloride synthesizing furnace. The negative pressure auto-ignition method is characterized by comprising the following steps: calling a nitrogen purging program by a computer: starting nitrogen purging, collecting nitrogen pressure data up to a set value, and starting a timer for timing till a set time; calling a nitrogen purging stopping program by the computer: turning off nitrogen purging; delaying for a certain time; calling an air controlling program by the computer: opening an air valve, and injecting air into the furnace; calling an igniting gun program by the computer: igniting by using the igniting gun, collecting temperature data and ultraviolet data detected from flame of the igniting gun till the temperature data and / or ultraviolet data reach / reaches set values / value; and calling a central flame controlling program by the computer: opening a central small flame hydrogen valve and a central small flame chlorine valve, filling quantitative hydrogen and chlorine into the furnace in proportion, delaying for a certain time, and opening a central flame hydrogen valve and a central flame chlorine valve, and further filling quantitative hydrogen and chlorine into the furnace in proportion.

The invention belongs to the hydrogen storage technology in the hydrogen energy field and particularly relates to a hydrogen-absorption low-strain metal hydride hydrogen storage tank. The hydrogen storage tank mainly comprises a tank body, a metal hydride hydrogen storage alloy bed body and an elastic buffer layer. The elastic buffer layer is arranged between the tank body and the metal hydride hydrogen storage alloy bed body. A heat exchange pipe is communicated with the interior of the metal hydride hydrogen storage alloy bed body and used for guiding heat generated in the hydrogen absorption and release processes of the metal hydride hydrogen storage alloy bed body out. A hydrogen valve is installed on an outlet of the tank body and meanwhile a hydrogen filter is welded to the outlet end of the tank body. The hydrogen-absorption low-strain metal hydride hydrogen storage tank is simple in structure and easy to obtain, the destructive effect on the tank body due to the fact that the metal hydride hydrogen storage alloy bed body expands after absorbing hydrogen can be relieved effectively, and the use safety of the hydrogen storage tank is improved.

The invention discloses a preparation method for synthesizing carbon nanotubes in quantity and with low cost. The method comprises the following steps of: plating and coating nano-grade metal catalysts such as iron, cobalt, molybdenum and the like on foamed nickel by a chemical plating process; placing the foamed nickel plated with the catalysts into a quartz boat; heating the foamed nickel plated with the catalysts by using the common horizontal resistance furnace; introducing nitrogen with flow of 200 ml / min to remove air from a quartz tube; when the temperature reaches 650 DEG C, introducing hydrogen with flow of 50 ml / min to reduce the metal catalysts for 10 minutes; when the temperature reaches 690 to 720 DEG C, introducing acetylene gas with flow of 50 to 100 ml / min, wherein the hydrogen flow can be set to be 25 to 100 ml / min; closing an acetylene valve and a hydrogen valve after the reaction is performed for 30 minutes; introducing nitrogen with the flow of 20 ml / min; when the temperature is reduced to 300 DEG C, closing a nitrogen valve; and after the hearth is cooled to room temperature, taking out the quartz boat, wherein black products are found to be generated on the foamed nickel and are the carbon nanotubes according to electron microscope and Raman spectrum detection. By the method, the preparation process is simple; energy consumption is small; cost is low; time is saved; and preparation conditions are easy to implement.