278 results about "Oxygen analyzer" patented technology

The present invention relates to methods and systems for controlling a combustion reaction and the products thereof. One embodiment includes a combustion control system having an oxygenation stream substantially comprising oxygen and CO₂ and having an oxygen to CO₂ ratio, then mixing the oxygenation stream with a combustion fuel stream and combusting in a combustor to generate a combustion products stream having a temperature and a composition detected by a temperature sensor and an oxygen analyzer, respectively, the data from which are used to control the flow and composition of the oxygenation and combustion fuel streams. The system may also include a gas turbine with an expander and having a load and a load controller in a feedback arrangement.

The invention relates to pre-alloying powder for a diamond tool and a manufacturing method thereof. The pre-alloying powder adopts Fe phase or Cu phase as the main phase. The pre-alloying powder is characterized in that: trace B strengthens crystal boundary and refines crystal particles; Ni, Co and Me (at least one of Mn, Cr, Si, Ti, V, W and Mo is selected) are adopted as strengthening elements; and Sn, P and C further adjusts an alloy structure. The pre-alloying powder is prepared by the high-pressure water atomization powdering technology. The manufacturing method is characterized in that: alloy liquid is smashed by high-pressure water which is preferential for many times, the meso-position diameter D50 of the powder measured by a laser particle-size meter is within 7 to 18mum, and the preference is within 7 to 13mum; the full oxygen content measured by a full oxygen analyzer is smaller than or equal to 0.35% (mass), and the preference is smaller than or equal to 0.25% (mass).

A method of calibrating a metabolic analyzer incorporating an oxygen analyzer and a NDIR carbon dioxide analyzer in the field that does not require the use of gas cylinders containing gases of known concentration is described. In calibrating the CO₂ detector, at the time of factory setup, the detector output for a gas of a known concentration is measured and stored in the memory of the metabolic analyzer's microprocessor, as is the detector output voltage when the IR source is dimmed by a known percentage. Subsequently, in the field, CO₂ levels in ambient air and cell pressure are measured at two different flow rates through the sample chamber and the IR source is again dimmed by the same percentage as had been used at the time of factory setup. Based upon the resulting readings, both the zeroing and span adjustment factors can be computed.

A flammability tester for samples in the milligram range. A tube with a lower pyrolyzing region, or pyrolyzer, contains a sample that is heated to thermally degrade in the absence of oxygen, or pyrolyzed, to produce fuel gases. An inert gas carries the fuel gases to an upper combustion region, or combustor, where oxygen is measured into the gas flow containing the inert gas and fuel gases. Combustion of the fuel gases occurs at a temperature where the reaction time for almost all of the fuel gases is at or below 10 seconds. Under these conditions, the combustor volume need for complete combustion is small, permitting the fuel gases to be oxidized as they are liberated and travel from the pyrolyzer into the combustor in what is essentially sequential flow. Complete combustion in such a small volume produces a large decrease in the oxygen content of the gases emerging from the combustor, allowing the use of a simple inexpensive oxygen analyzer to measure the oxygen content of the gases emerging from the combustor. Oxygen depletion can be used to determine flammability parameters of the sample. The tester can be fitted with a thermometer to measure the combustion temperature of the pyrolyzed sample. The tester may also be configured to use a carbon dioxide analyzer to measure additional flammability parameters. The tester may also be combined with a separate thermogravimetric analyzer to yield further flammability parameters where the mass loss rate of the pyrolyzing sample is needed.

The invention relates to the field of semiconductor production devices and discloses a low-oxygen control system comprising a nitrogen gas conveying device, a circulating fan and a treatment chamber which are connected in sequence, wherein the outside of the treatment chamber is also connected with a circulating pipe and an oxygen analyzer; the other inlet of the oxygen analyzer is connected with the nitrogen gas conveying device; and the circulating fan is also provided with an air ventilating valve. The low-oxygen control system can control the oxygen concentration of a relative space (microenvironment), thereby effectively controlling the natural oxygen condition of a chip.

The invention provides a method for evaluating and testing the ignition tendency of a cigarette. The method is characterized in that an ignited cigarette is put into a glass device, an air pump is started and is used for pumping out smoke gas generated by burning from the glass device, a filter is used for filtering out moisture and particulate matters in the smoke gas, the smoke gas is pumped into an oxygen analysis through a flow meter and the air pump, the real-time oxygen concentration in a cigarette burning process is analyzed, oxygen concentration values are input to a computer and are analyzed and treated, and the amount of thermal release of the cigarette is worked out by calculating the oxygen consumption after the cigarette is ignited, so that the ignition tendency of the cigarette is represented. Compared with a conventional method based on ISO12863 'Cigarette Ignition Tendency Evaluation Method Standards', the method has the advantages that the relative good theory support is supplied, the possibility that the cigarette ignites other matters can be reflected fundamentally, the testing efficiency is relatively high, and the operation is relatively simple and convenient; test results can be directly counted by high-efficiency computer software and are convenient to store and analyze; the consumption of filter paper and consumable materials in the testing process is reduced, and the testing cost is greatly saved.

A system for performing respirometry in the field that has the following: a) a sample inlet; b) a filter connected to the sample inlet and to a mass flow meter, to prevent the entry of particulate matter; c) a pump connected to the mass flow meter; d) a plurality of analyzers connected to the pump to maintain flow through the analyzers, the plurality of analyzers comprising at least i) an oxygen analyzer; ii) a carbon dioxide analyzer; iii) a barometric pressure measurement means, plumbed either to ambient pressure, pressure within the flow system, or to both; iv) a water vapor analyzer to measure relative humidity (RH) in the sampled air; and v) a temperature sensor near the water vapor analyzer; e) a data acquisition system that translates into digital form data from the plurality of analyzers; f) a data management system that incorporates data from the analyzers and performs calculations to at least determine percentages of oxygen and carbon dioxide corrected for water vapor pressure; g) a control system integrated into the apparatus to provide user control over at least some of the calculations; and h) a display for readouts of the plurality of analyzers and results of the calculations.

The invention discloses a testing device for imitating shot impact on a fuel tank of an airplane. The testing device comprises a pair of base sliding blocks, the fuel tank, a flame propagation observation box and a hollow box, wherein the pair of base sliding blocks is fixed on the lower surface of the fuel tank parallelly; a pressure bearing plate is arranged on a pressure relief opening in a top plate of a fuel tank body; the top plate of the fuel tank body is provided with an air/oxygen analyzer, a vacuum pump, an oil filling opening temperature/pressure measuring instrument, a fuel tank fan and an air/nitrogen filling opening; an oil outlet is formed in the middle of a bottom plate of the fuel tank; the flame propagation observation box is arranged on one side of the fuel tank; an incidence plate is arranged in the middle of the front side of the fuel tank; an impact plate is fixed on a fixed frame and is superposed with the incidence plate; an outgoing plate is arranged in the middle of the back surface of the fuel tank; and the hollow box of which the inner part is filled with soil is positioned on the back surface of the fuel tank. By the testing device, propagation conditions and state change of flame in fuel tanks of airplanes of different types after a nitrogen inerting technology is utilized can be imitated; and the testing device has the characteristics of simple structure and high universality.

The invention discloses a remote monitoring and controlling system for an industrial grade photo bioreactor. The remote monitoring and controlling system comprises detecting and analyzing terminals: a temperature sensor, an on-line pH analyzer, an on-line dissolved oxygen analyzer, an on-line carbon dioxide analyzer and the like and a remote controlling platform, and the detecting and analyzing terminals are communicated with the remote controlling platform via communication network. The detecting and analyzing terminals of the remote monitoring and controlling system are arranged in the industrial grade photo bioreactor. By communication between the detecting and analyzing terminals and the remote controlling platform, when the culture environment is changed, the remote controlling platform regulates various physicochemical indexes remotely, thus realizing bidirectional interaction between the photo bioreactor and the remote controlling platform.

The invention discloses a modular case body manufactured by a metal laser additive. The modular case body comprises a rigid case body and a flexible case body, wherein a reserved hole is formed in one case wall of the rigid case body; the case opening of the flexible case body hermitically communicates with the rigid case body through the reserved hole; a sealing isolation plate is arranged on a position, on the outer side of the reserved hole, on the rigid case body; an extraction opening and an inflation opening are formed in the case wall of the rigid case body; laser additive manufacturing equipment is mounted in the rigid case body; the extraction opening is externally connected with a vacuum pump; a first valve is additionally arranged on a gas path between the extraction opening and the vacuum pump; the inflation opening is externally connected with an inert gas source; a second valve is additionally arranged on a gas path between the inflation opening and the inert gas source; the rigid case body is externally connected with an inert gas self-circulating purification system which comprises an oxygen analyzer, a fan, a deaerator, a dust collector and a cooler; the gas inlet end of the fan hermitically communicates with the inside of the rigid case body through the oxygen analyzer; the gas outlet end of the fan hermitically communicates with the inside of the rigid case body through the deaerator, the dust collector and the cooler.

The present invention discloses a tobacco combustion heat measurement apparatus, which comprises a gas supply device, a combustion device, a filtration device and an analysis device, wherein the combustion device comprises an annular heating furnace and a controller, one quartz pipe end arranged inside the annular heating furnace is a heating end, the other end is a non-heating end, the end is provided with a sealing member, a quartz boat is arranged in the quartz pipe and is pushed by a step motor to move at a uniform speed, the sealing member is provided with two through holes for a gas supply pipeline channel and a step motor transmission channel, the filtration device comprises a high temperature resistance filter directly connected with the gas outlet end of the annular heating furnace, and a second-stage filter communicated with the analysis device, the two stages of the filters are connected through a cooling pipeline, the filtration device is used for filtering particle phase substances and water in the combustion product so as to avoid influence on the analysis device, and the analysis device comprises an oxygen analyser communicated with the second-stage filter through a pipeline. According to the present invention, the accurate measurement of the combustion heat of the tobacco under the stable poor-oxygen combustion state is achieved.

The invention relates to a denitrification process of waste water. The denitrification process comprises the following steps: online monitoring is performed on pH value of the waste water in an aerobic pool by a pH meter in the pool, and the pH value is controlled at the range of 7.4-8.3; and the online monitoring is performed on dissolved oxygen concentration of the waste water in the pool by an online dissolved oxygen analyzer in the aerobic pool, and then rotating speed of a blower is adjusted by a frequency converter so as to adjust aeration rate, thus controlling the dissolved oxygen concentration at 0.5mg/L-1mg/L. The denitrification process has the following advantages: saving energy: oxygen supply can be lowered by about 25% in the nitrification process, thus reducing energy consumption; reducing external carbon source: 40% of organic carbon source can be reduced in the denitrification process; and being capable of reducing excess sludge production amount: 24%-33% of the sludge to be produced can be reduced in the short-cut nitrification process and 50% of the sludge to be produced can be reduced in the denitrification process.

The invention discloses a gas online detection device in a protective gas heat treatment furnace, comprising a sampling port, a gas analysis and control part, an alarm device, a nitrogen gas supply device, a hydrogen gas supply device and a flow control device, wherein the sampling port comprises a first sampling port positioned at a preheat channel area, a second sampling port positioned at a heating chamber area, a third sampling port positioned at a jet flow cooling area and a fourth sampling port positioned at a cooling channel area; the gas analysis and control part comprises a hydrogen gas analyzer, an oxygen gas analyzer for analyzing oxygen gas content, a water analyzer for analyzing water content and a control unit; the control unit acquires analysis data of the hydrogen gas analyzer, the oxygen gas analyzer and the water analyzer and compares the data with preset values; and the nitrogen gas supply device and the hydrogen gas supply device are controlled by the control unit. The gas online detection device disclosed by the invention has a plurality of sampling points, meanwhile, online detection and analysis are carried out on multiple elements, corresponding measures are made according to a corresponding analysis result to ensure high stability of the protective gas in the furnace, and the production safety and the processing quality of workpieces are improved.

An oxygen-enriched combustion experiment evaluation device comprises a heating furnace and a chimney; the bottom of the heating furnace is provided with an air inlet pipe; the air inlet pipe is connected to an oxygen-enriching pipeline and an air pipeline; an oxygen analysis probe, which is connected to an oxygen analyzer, is arranged on the air inlet pipe; the heating furnace is connected to a fuel pipeline, the fuel pipeline is connected to a fuel supply device, a first flow meter and a flow speed regulator are arranged on the fuel pipeline; a flame temperature detector with a flame temperature detection probe and a heat calculating device are arranged on the heating furnace; and a flue gas analysis probe, which is connected to a flue gas analyzer, is arranged in the chimney. The air and oxygen is mixed in the air inlet pipe, the oxygen analyzer can detect the oxygen content; the fuel burns in the mixed gas, the flame temperature can be conveniently measured by the flame temperature detector, the flue gas components and contents can be detected by the flue gas analysis probe, and finally the heat generated by the combustion can be measured by the heat calculating device.

The invention relates to a device and method for determining breathing heat produced by a livestock. The device for determining the breathing heat of a livestock open type mask is characterized by comprising components of a breathing mask, an exchanger, a pressure difference determining instrument, a data collecting instrument and the like, wherein the breathing mask is provided with an air inspiration pipeline and an air expiration pipeline, and the air inspiration pipeline and the air expiration pipeline are the same pipeline. The invention also provides a method for determining the breathing heat produced by the livestock. According to the device and the method, provided by the invention, the humiture and the pressure difference of the pipeline can be monitored in real time due to the adoption of the open type breathing mask, the breathing oxygen consumption of the livestock can be directly analyzed by adopting a precise oxygen analyzer, and data can be recorded and analyzed in real time as the data collecting instrument is directly connected with a computer. The oxygen consumption of the livestock per heartbeat can be calculated by combining the determination of the heart rate of the livestock according to a principle that the oxygen consumption per heartbeat of the livestock in normal grazing or barn feeding is stable and the determination of the oxygen consumption of the livestock in short time and the heart rate, and the heat production quantity of the livestock can be then calculated according to heart rate monitoring data of the livestock in 24 hours.