268 results about "Lifting gas" patented technology

Various embodiments of the invention relate generally to systems for providing active vertical control of an airship. More particularly, at least one embodiment of the invention relates to a system for actively controlling the aerostatic lift of an airship by manipulating the ratio of air to lifting gas contained within the airship, and thus the overall mass of the airship. This manipulation is accomplished by actively compressing and/or decompressing the lifting gas or internal air, with the resulting pressure differential borne primarily by the hull and/or an internal pressure tank depending upon the configuration.

A balloon having a balloon envelope formed with a plurality of adjacent envelope gores sealed together at their respective edges to form an edge seam between each of the adjacent envelope gores, a tape comprised of fibers applied to a centerline of each of the envelope gores, wherein the envelope gores are constructed such that the edge seam between each of the adjacent envelope gores is longer than the centerline of each of the envelope gores, and wherein a load caused by pressurized lifting gas within the balloon envelope is carried primarily by the fiber tapes on the centerlines of the envelope gores, rather than the edge seams between the adjacent envelope gores.

A method for optimizing the production of a petroleum well is provided. The petroleum well includes a borehole, a piping structure (24) positioned within the borehole, and a tubing string (26) positioned within the borehole for conveying a production fluid. Production of the well is optimized by determining a flow rate of the production fluid within the tubing string (26) and determining a lift-gas injection rate for the gas being injected into the tubing string. The flow rate and injection rate data is communicated along the piping structure of the well to a selected location (44), where the data is collected and analyzed. After analysis of the data, an optimum operating point (152) for the well can be determined

This invention relates to the field of buoyant aircraft and operation thereof, in particular, airships with improved stability. The present invention is directed to non-rigid, non-spherical airships having an envelop contained within the airship and at least one further envelop contained therein for holding a volume of lifting gas.

Apparatus and method for a continuous replenishing of the lift gas and maintaining the proper pressure and lift of a tethered medium altitude aerostat utilizing a novel feed tube running the entire length of the tether. A first end of the feed tube is connected to the aerostat while a second end is connected through a novel slip ring means to a pressure controlled helium ballast chamber and scrubber on the ground to maintain pressure and lift by a reversible compressing pump. A plurality of pressure and temperature sensors and tension gauges strategically placed inside and around the airship continuously monitor the temperature and pressure changes in the aerostat. A data retrieval and communication unit mounted on the aerostat collects measurement data from the pressure, temperature and tension sensors which is relayed to the ground station and the data is used to regulate lifting gas pressure inside the aerostat.

An apparatus and associated method for launching and recovering a lighter-than-air aircraft are provided. The aircraft includes an envelope that is substantially filled before launch with a lift gas and a second gas. The lift gas and second gas are substantially separated in the envelope by a boundary layer of mixed gas, formed by the lift and second gases. The aircraft is supported by one or more masts as the lift gas is injected to achieve the required buoyancy for launch. The aircraft is then released and rises, for example, in an inclined orientation. As the aircraft climbs, the lift gas expands in the envelope, and the second gas is vented therefrom. During horizontal descent, air can be pumped into the envelope to maintain the envelope in a substantially filled configuration. The air and lift gas can be mixed to avoid sloshing and pooling.

High-altitude balloons and apparatuses for filling such high-altitude balloons are provided. As an example, an apparatus for filling a high-altitude balloon includes a tube extending through envelope material of the balloon is provided. The apparatus also includes a flange connected to a first end of the tube. The flange is connected to an interior surface of the balloon. A fitting is connected to a second end of the tube. The fitting is configured for attachment with an apparatus for filling the balloon with lift gas. In addition, methods of filing high-altitude balloons with lift gas and methods of manufacturing balloons are also provided.

The invention discloses a constant-pressure automatic compensation system of an aluminum alloy hub deburring machine, wherein a processing platform, an upper hair brush plate, a lower hair brush plate, an upper lifting gas cylinder and a lower lifting gas cylinder are arranged on a machine frame in a positioning way; the upper lifting gas cylinder and the lower lifting gas cylinder are respectively used for driving the upper hair brush plate and the lower hair brush plate to act; proportional control valves are connected between the gas inlets of the upper lifting gas cylinder and the lower lifting gas cylinder and a gas source respectively; a pair of pressure sensors are also arranged between the gas inlets of the upper lifting gas cylinder and the lower lifting gas cylinder and the gas source; the pressure sensors are respectively used for sensing gas pressure signals at the gas inlets of the upper lifting gas cylinder and the lower lifting gas cylinder, and transmitting the gas pressure signals to a controller; the controller implements analysis and calculation on the gas pressure signals and controls the flow rate of gas flowing out from the two proportion control valves, so that the condition that the upper hair brush plate and the lower hair brush act by the constant-pressure push of the upper lifting gas cylinder and the lower lifting gas cylinder can be guaranteed; therefore, not only the problem that not all burs are removed due to insufficient pressure of the upper hair brush plate and the lower hair brush plate, but also the problems that due to overlarge pressure of the upper hair brush plate and the lower hair brush plate, a hub is scrapped, and the service lives of the upper hair brush plate and the lower hair brush plate are shortened can be prevented.

A low-cost RH molten steel nitrogen increasing process belongs to the technical field of steelmaking. The process route of "converter-ladle furnace refining-RH refining-continuous casting" is used for smelting; converter tapping adopts deoxidation alloying, and vanadium-iron alloy is added to match vanadium according to the target value of the steel type during the tapping process, and the molten steel temperature is raised according to the normal process in the ladle furnace , alloy fine-tuning and deep desulfurization treatment, after the molten steel is hoisted to the RH furnace, the lifting gas of the RH furnace is set to nitrogen, the flow rate is controlled according to 800-1200NL/min, and the vacuum treatment time is 8-10min. Blowing operation, to reach the level of nitrogen content in steel at 80-120ppm. The advantage is that it can partially replace the vanadium-nitrogen alloy and reduce the cost of the alloy; ensure the stability of the nitrogen content and reduce the performance fluctuation of the steel plate caused by the composition fluctuation; the RH refining stage uses nitrogen instead of argon to realize the dual functions of process and composition control, further reducing the steelmaking process cost.

A device for maneuvering cylinders having first and second semi-circular lifting members hingedly connected to one another by first and second hinge members. The lifting members are urged toward one another and the cylinder to frictionally secure the lifting members against the cylinder for maneuvering of the cylinder. First and second free ends of the first lifting member are maintained in a spaced apart relationship relative to first and second free ends of the second lifting member corresponding to a desired gap distance, and the first and second hinge members of each lifting member each define a hinge point located a desired hinge distance vertically spaced from free edges of each of the lifting members, such that the ratio of the gap distance to the hinge distance is at least about 1.25.

A system allowing for the active management of aerostatic lift in buoyant and semi-buoyant aerial vehicles comprised of a high tensile-strength outer pressure cell of a given volume and an inner compression cell of only slightly smaller dimensions. The inner compression cell is filled with a lifting gas, such as helium or hydrogen, to some fractional volume of its maximum, allowing for expansion of the lifting gas at different operational altitudes. When a reduction in aerostatic lift is desired, external air is compressed through the use of air handling means, and introduced into the outer pressure cell through a directional valve that prevents the pressurized air from leaving the pressure cell. When increased aerostatic lift is once again desired, the valve system may release all or a part of the pressurized air in the pressure cell, allowing the lifting gas to expand thereby displacing a greater volume of air and increasing lift.

Fresh catalyst particles are added to a slurry hydrocarbon synthesis reactor and their activity increased by contact with hydrogen in-situ in the slurry in a catalyst activity increasing means, while the reactor is producing hydrocarbons. The means may be a simple, vertically oriented and hollow tube, open at the top and bottom, into which slurry and a hydrogen treat gas are passed. The treat gas acts as a lift gas which provides slurry circulation into and out of the means and back into the slurry body, while increasing the activity of the catalyst particles. During the activity increase of the fresh catalyst, partially and reversibly activated catalyst particles are rejuvenated. The activity increasing means may be inside the reactor and at least partially immersed in the slurry or external of the reactor, or both.

The invention discloses a hydrotreating method of product circulation. One part of circulation of a hydrotreated liquid phase product is mixed with a raw material into a liquid phase material, and the liquid phase material enters the upper part of a reactor. The hydrotreating method of product circulation is characterized in that the upper part of the reactor is provided with at least one air-lift tray of which the lower part is introduced with hydrogen; the hydrogen and the liquid phase material contact on the air-lift tray for the air lift of hydrogen sulfide and ammonia in the liquid phase material; meanwhile, hydrogen is further dissolved in the liquid phase material; the air-lift liquid phase material enters a catalyst bed on the lower part of the reactor for hydrotreating reaction; and air-lift gas containing hydrogen sulfide and ammonia is discharged from the top of the reactor. The reactor adopted by the invention simultaneously has the action of catalytic hydrotreating reaction and the action on causing products H2S, NH3 and the like to be discharged out of a reaction system by air lift, thus greatly improving hydrotreating reaction efficiency and enhancing technology flexibility and raw material adaptability.

A lighter-than-air ship using hydrogen or other gas as a lift gas with at least one hydrogen fuel cell aboard. The fuel cell can draw hydrogen fuel from the lift gas reservoir to produce electricity both for the ship's use and optionally for propulsion. The waste product of the fuel cell is water which can be used for the needs of a crew on the ship. The hydrogen lift gas chamber, which can be compartmentalized for lift control, can be surrounded by a safety jacket filled with an inert gas and contain optional hydrogen and/or oxygen sensors.

The invention belongs to the technical field of steelmaking, and particularly relates to a dynamic control method for refining ultra-low carbon steel through RH CO2 spraying. The dynamic control method is suitable for a 30-300 t RH ladle refining process. In the RH refining process, O2 and CO2 are adopted as top-blowing gases, Ar and CO2 are used as lifting gases; molten steel components in the refining process are predicted based on material conservation according to RH refining in-station molten steel component data, refining process furnace gas component data and vacuum equipment working conditions; the top blowing and lifting gas flow is dynamically adjusted according to requirements of target components of refined molten steel stage by stage; on the basis of strengthening the stirringeffect of the RH refining process, the nitrogen content in the molten steel is further reduced, and the quality of molten steel is improved; and meanwhile, excessive oxidation of the molten steel inthe RH decarbonization process is avoided, the consumption of a deoxidized alloy is reduced, and on the basis of reducing the consumption of Ar, the production cost is further reduced, and the refining period is shortened. As a result, the alloy consumption is reduced by 3%-8%, the RH refining period is shortened by 1-2 minutes, the denitrification amount is increased by (3-10)*10<-6>, and the quality of the molten steel is improved.

The invention discloses an RH refining desulphurization process of non-oriented electrical steel, belonging to the technical field of steel making. The process comprises the following steps: setting the lift gas flowrate to 1200 NL/min after the entering of the RH, and enhancing the lift gas flowrate to 1600 NL/min 3 minutes later; blowing oxygen to perform the forced decarburization when the vacuum degree is reduced to 2.0 mba, and when the oxygen blowing is finished and the vacuum degree is lower than 2.0 mba, performing the natural decarburization for 20 minutes; adding the aluminum for deoxidation when the vacuum decarburization is finished; and performing the silicon alloying by using the low carbon ferrosilicon, and adding the desulfurizing agent into the vacuum chamber in two timesthrough the RH alloy bin. The circulation time of the test furnace batch is from 10 minutes to 15 minutes. The process provided by the invention has the advantages that the RH device needs no reconstruction, and the operation is simple. The average RH desulphurization degree is 36.7%, and the desulphurization effect is better. The contents of the FeO and the MnO of the ladle slag have significantinfluence on the desulphurization effect, and the enhancing of the alkalinity of the ladle slag can increase the RH desulphurization efficiency as well as reduce the corrosion of the RH device.

Fresh catalyst particles are added to a slurry hydrocarbon synthesis reactor and their activity increased by contact with hydrogen in-situ in the slurry in a catalyst activity increasing means, while the reactor is producing hydrocarbons. The means may be a simple, vertically oriented and hollow tube, open at the top and bottom, into which slurry and a hydrogen treat gas are passed. The treat gas acts as a lift gas which provides slurry circulation into and out of the means and back into the slurry body, while increasing the activity of the catalyst particles. During the activity increase of the fresh catalyst, partially and reversibly activated catalyst particles are rejuvenated. The activity increasing means may be inside the reactor and at least partially immersed in the slurry or external of the reactor, or both.