8 results about "Limiting oxygen concentration" patented technology

The invention discloses a combustible liquid limit oxygen concentration testing device and method, and the device comprises an electrolyte supply system which comprises a height-adjustable placement platform and a constant-pressure liquid supply module; the combustion system comprises a base and a combustion tube, a partition plate is fixedly connected to the middle position in the combustion tube, an ignition module is detachably connected to the center position of the top face of the partition plate, a lampwick tube is arranged in the ignition module, a lampwick is arranged at the top end of the lampwick tube, and rectification modules are arranged on the top face of the partition plate and the inner bottom of the combustion tube correspondingly; an experimental darkroom is mounted on the top surface of the base; a gas inlet pipe is mounted at the bottom of the combustion pipe; the gas distribution system is connected with the control system; the optical measurement and analysis system is mounted in the experimental darkroom; a waste liquid recovery module is installed at the bottom of the base. A discharge pipe is installed at the bottom of the combustion pipe. The constant-pressure liquid supply module can ensure that electrolyte with stable pressure is provided for the lampwick tube, and the accuracy and repeatability of a test result are ensured.

A method of additive manufacture is disclosed. The method may include restricting, by an enclosure, an exchange of gaseous matter between an interior of the enclosure and an exterior of the enclosure. The method may further include running multiple machines within the enclosure. Each of the machines may execute its own process of additive manufacture. While the machines are running, a gas management system may maintain gaseous oxygen within the enclosure at or below a limiting oxygen concentration for the interior.

A method of additive manufacture is disclosed. The method may include restricting, by an enclosure, an exchange of gaseous matter between an interior of the enclosure and an exterior of the enclosure. The method may further include running multiple machines within the enclosure. Each of the machines may execute its own process of additive manufacture. While the machines are running, a gas management system may maintain gaseous oxygen within the enclosure at or below a limiting oxygen concentration for the interior.

Provided is a method for oxidizing metal powder that easily controls oxidation of the metal powder. A method for oxidizing metal powder (M) housed in a container (3), wherein: the container (3) is placed in an atmosphere of an inactive gas at a first pressure higher than atmospheric pressure; and a mixed gas containing an inactive gas and oxygen is introduced into the container (3) in such a manner that the oxygen concentration in the container (3) is lower than the limit oxygen concentration of the metal powder (M), and the pressure in the container (3) is raised to a second pressure higher than the first pressure.

A device (10) for generating hydrogen from water using electrical current, comprising a plurality of electrolysis devices (11), each electrolysis device (11) having at least one water supply connection (13), at least one water discharge connection (14), and at least one hydrogen discharge connection (15), each electrolysis device (11) being connected via its at least one water supply connection (13) to a supply line (16) for water, via its at least one water discharge connection (15) to a discharge line (17) for water and oxygen, and via its at least one hydrogen discharge connection (15) to a discharge line (18) for hydrogen, comprising a housing or frame (19) in which the electrolysis devices (11) are arranged, and comprising an inert gas generating device (20) configured to generate inert gas in situ in the device (10), the inert gas generating device (20) being configured,using hydrogen to reduce the oxygen content in air to such an extent that the air serves as an inert gas and has an oxygen content that is lower than a limiting oxygen concentration of hydrogen, wherein each electrolysis device (11) and / or the hydrogen discharge line (18) and / or a device (22) arranged in the hydrogen discharge line (18) for processing the hydrogen and / or the water and oxygen discharge line (17) and / or a device (23) arranged in the water and oxygen discharge line for removing oxygen from the discharged water and / or the housing or frame (19) can be purged with inert gas generated by the inert gas generating device (20).

The present invention discloses a test device and method for the limiting oxygen concentration of combustible liquids, comprising: an electrolyte supply system, which includes an adjustable-height placement platform and a constant-pressure liquid supply module; a combustion system, which includes a base and a combustion tube. A partition is fixedly connected to the middle position inside the combustion tube, and an ignition module is detachably connected to the center position of the top surface of the partition. A wick tube is arranged inside the ignition module, and a wick is provided at the top end of the wick tube. A rectification module is respectively arranged on the top surface of the partition and the bottom inside the combustion tube. An experimental darkroom is installed on the top surface of the base; a gas distribution system, an intake pipe is installed at the bottom of the combustion tube; a control system, the gas distribution system is connected to the control system; an optical measurement and analysis system, the optical measurement and analysis system is installed inside the experimental darkroom; a waste liquid recovery module is installed at the bottom of the base, and a discharge pipe is installed at the bottom of the combustion tube. The constant-pressure liquid supply module of the present invention can ensure that the electrolyte with a stable pressure is provided for the wick tube, guaranteeing the accuracy and repeatability of the test results.

A method and system for vapor space monitoring and control, the method including monitoring a concentration of oxygen in a vapor space of a closed vessel, and halting operation of mechanical equipment in the closed vessel responsive to the concentration of oxygen being above a predetermined limit below a limiting oxygen concentration for a combustible gas within the vapor space.

The invention relates to the technical field of mixture explosion judgment, and discloses a combustible gas-nitrogen mixture explosion risk judgment method and system, and the method comprises the steps: building a hyperbolic model based on the constraint formed by the explosion lower limit and the limit oxygen concentration of explosive gas in a mixture; drawing a corresponding model curve in the rectangular coordinate system by using a function drawing program to form an explosion area classification graph; inputting the two-time mixed data into an explosion area classification map, and judging the explosion risk of the secondary mixture according to the position; if the hyperbolic model judges that explosive exists, an alarm is given out immediately; the data is transmitted to the cloud for real-time calibration; and when the explosive gas mixture data and the cloud data reach a preset similarity value, early warning is given out immediately. The system comprises a hyperbolic model construction module, an explosion attribute judgment module and an explosion early warning module. According to the invention, accurate assessment and rapid response to the explosion risk of the mixed gas are realized, and the method has important safety value.