323 results about "Gas uptake" patented technology

The invention discloses an infrared cavity ring-down spectroscopy trace gas detection method based on quantum cascade laser; comprising the following steps: using a tunable quantum cascade laser as alight source, and selecting measuring waveband and wavelength scan step length aiming at spectrum line characteristic of the gas to be detected; respectively measuring the cavity ring-down time of each wavelength in the cavity with absorption or without absorption by cavity ring-down technique, and calculating the gas absorption coefficient of corresponding wavelength so as to obtain a relation curve that is an absorption spectrogram of the measured gas absorption coefficient and toned laser wavelength. The spectrogram is contrasted with spectrum line characteristic of corresponding gas in HITRAN database, thereby being capable of analyzing and determining weather the measured gas contains the predetermined gas component; the absolute concentration of the gas to be measured can be calculated and obtained and the absolute concentration of the gas to be measured can be measured through scaling measurement by using absorption peak wavelength of the absorption spectrum as the best detection wavelength and the relation among the gas absorption coefficient of the wavelength, the absorption cross section and concentration. The method has high measuring sensitivity and high property of resisting interference so that the fast and exact on-line analysis and detection of multiple trace gases are easily realized.

The device comprises a laser source which emits a beam of a predetermined wavelength towards an optically transparent closed container and detectors arranged to detect the laser beam which is attenuated by the gas absorption. The detectors provide the first data of absorption representative of a first absorption spectrum of the gas including distorted absorption lines and noise. The invention implements a method of calculation aimed at receiving and elaborating said first data. The output of the operation are parameters that represent a second absorption spectrum free of noise and distortion in the absorption lines. From these parameters we are able to determine the gas pressure and concentration in the container.

A correlation filter is provided having passbands at wavelengths corresponding to the absorption spectrum of an atmospheric gas of interest. In particular, the correlation filter features narrow, non-linearly spaced passbands having center wavelengths that are correlated to the non-linearly spaced absorption lines of an atmospheric gas. A correlation filter in accordance with an embodiment of the present invention includes a compensation stack having a number of thin film layers, at least some of which have an optical thickness that is not equal to an integer multiple of one-quarter of a wavelength of an absorption line of the gas of interest. The correlation filter may be provided in association with an etalon, or may comprise a number of optical cavities. In accordance with an embodiment of the present invention, a number of absorption lines associated with an atmospheric gas may be simultaneously viewed, providing a signal indicating the presence and quantity of such gas in the atmosphere having a high signal-to-noise ratio.

The related IR gas analyzer to on-line detect gas concentration comprises: a gas transmission device, an original-path reflector, a connection control box, a standard gas scaling unit, a gas cleaning device, and a SCM. With open-loop structure, this invention can change for different gas absorption feature, runs stably and accurately, and needs a little maintenance.

A device for measuring the concentration of a gas contained in a cavity and for checking the operation of a catalytic element in an exhaust line in an automobile vehicle. A first emitter (E1) composed of an optical pumped micro-cavity and for which the emission spectrum is within the gas absorption band emits a first radiation that passes through the cavity. A second emitter emits a second radiation that passes through the cavity. A receptor measures the optical intensity (I) of the radiation that passed through the cavity.

The invention discloses a device for testing solubility of weak acid gas in an alkalinity absorption liquid, and belongs to the fields like gas absorption and separation and petrochemical industry, and the device is suitable for detesting an equilibrium solubility curve of the weak acid gas under different gas partial pressures and different temperatures. The device is composed of a gas transmission system, a reaction tank, a temperature control system, a sampling system, a gas partial pressure measuring system, a liquid sample analytic system and a gas volume measuring system, wherein the stainless steel reaction tank can increase the measurement range of the gas partial pressure, gas and liquid respectively control temperature so that the temperature is uniform and the use of a magnetic stirrer becomes possible, an intelligent instrument is utilized to carry out temperature control with high precision and pressure display, an acid hydrolysis method is adopted to analyze a liquid sample so as to obtain the solubility, the gas is utilized to blow down the liquid remained at the pipeline in the last experiment and the precision is improved, a eudiometer is adopted as a tool for measuring the gas volume, the measuring precision of the gas volume is guaranteed, the experimental result is more stable and reliable. The device provided by the invention has the advantages that the property is stable and reliable, and the device is simple and convenient.

The invention discloses a multi-angle welding machine, and relates to the technical field of welding equipment. The multi-angle welding machine comprises an equipment rack and a welding machine body.Multi-angle adjusting equipment is installed on the equipment rack, and the welding machine body is subjected to angle adjustment on an XY plane through the multi-angle adjusting equipment. The equipment rack is provided with a rotating mechanism, the rotating mechanism can clamp a welding material and rotate the material, and a gas absorption device is arranged above the multi-angle adjusting equipment. The multi-angle adjusting equipment is driven by a second motor, a screw rod and a stabilizing rod to move front and back, and the multi-angle adjusting equipment enables the welding machine body to achieve moving adjustment of 0 degree to 180 degrees on the multi-angle adjusting equipment. Through the arrangement of the rotating mechanism, the welding material can be clamped and rotated,and the welding machine body cooperates with a hydraulic telescopic rod to complete telescopic welding. Multi-angle welding can be achieved after the material is fixed and subjected to welding programming, more convenience and rapidness are achieved, and the occupied space of the equipment is small.

The invention discloses a gas absorption chamber which comprises a box and three concave mirrors with the same curvature radius. The primary concave mirror is fixed in the box, the two secondary concave mirrors are fixed on the opposite side of the primary concave mirror in the box, the spherical surface of each secondary concave mirror is opposite to that of the primary concave mirror, and the sphere centers of the two secondary concave mirror are positioned on the spherical surface of the primary concave mirror and are in bilateral symmetry relative to a main axis of the primary concave mirror. Besides, an entrance port and an exit port are arranged on one side of the box close to the primary concave mirror and are in bilateral symmetry relative to the main axis of the primary concave mirror, and a gas inlet and a gas outlet are arranged in the plane, on which the sphere centers of the three concave mirrors are located, on the box, and the main axis of the primary concave mirror is parallel to the plane of the entrance port and the exit port. Compared with the prior art, the gas absorption chamber has the advantages that the effective optical distance thereof can be increased by more than ten times as compared with that of a single-optical-distance gas chamber, and the effective optical distance of the gas absorption chamber can be also doubled as compared with that of a traditional White gas absorption chamber.

Apparatus for heat exchange in a high pressure gas storage tank wherein a heat absorbent gas media circulates within the tank and absorbs or radiates the heat resulting from compression and expansion of gas stored in the on board tank depending upon the mode of operation of the vehicle, the gas media is circulated through a heat exchange unit external to the tank whereby heat is radiated to or absorbed from an environment external to the tank, and an in situ heat exchange device installed within the tank absorbs or radiates the heat from or to the gas stored in the tank as a result of heat exchange through a unit external to the tank.

The invention relates to a detection device and a detection method of ammonia gas and sulfur dioxide gas concentration. The device consists of an ultraviolet light source, a collimate lens, a runner, a gas absorption pool, a convergent lens, an ultraviolet optical fiber, a spectrograph and a computer. By adopting the detection device and the detection method, the problem that the FFT characteristic frequency peak values of the absorption spectrum of two gases interfere with each other can be solved. The detection device and the detection method have the advantages of not needing measurement on a gas absorption cross section and being simple in calculation, high in response speed and the like, the temperature and pressure do not need to correct the absorption cross section, the cost is low, and the stability is good.

The invention discloses a photoacoustic spectrometry gas detection device based on a pulse infrared light source. The infrared light source is used as an emitting light source, pulse modulation is conducted on the light source, and concentration detection can be conducted on gas easy to absorb within the whole emission spectrum range of the infrared light source. The concentration of specific gas is detected through a filter wheel and light filters, wherein the six light filters can be installed on the filter wheel, the filter wheel is controlled by a serial port to rotate so that different light filters can be selected, and six types of gas can be detected at the same time at most. The photoacoustic effect generated after to-be-detected gas in an inner cavity of a photoacoustic pool absorbs an optical signal with the specific wavelength is converted into an electric signal through a microphone, a band-pass filter amplification circuit is input, analysis and calculation are conducted through a data collection and control module, and concentration of various types of gas is obtained. By means of the device, six types of gas including CO, CO2, CH4, C2H2, C2H4 and C2H6 can be quantitatively detected, and the device is suitable for on-site detection of gas in transformer oil.

The invention discloses an online calibrating method of an in-situ laser gas analyzer. A device comprises a laser emission unit, a signal detection unit, a laser device control module, a signal processing module, a data analysis module, a measurement pipeline and an online calibrating gas chamber. The calibrating method comprises the following steps : selectively carrying out online calibration when the concentration of gas in the measurement pipe is stable, firstly leading nitrogen into the online calibrating gas chamber; recording a gas absorption spectrum obtained by the signal detection unit at the moment by the signal processing module, then leading standard gas at special concentration into the online calibrating gas chamber, recording by the signal processing module the gas absorption spectrum obtained by the signal detection unit at the moment when the standard gas is led; subtracting by the signal processing module the gas absorption spectrum obtained at the moment when the nitrogen is led from the gas absorption spectrum obtained at the moment when the standard gas is led, and obtaining the absorption spectrum of the standard gas, so as to achieve the purpose of online calibration of the in-situ laser gas analyzer.

The embodiment of the invention provides a gas absorbent for reducing gas concentration. The gas absorbent belongs to harmful gas absorbing materials of mines. The absorbent is liquid organic ordered combination solution which is formed by mixing the following materials by weight percentage: 1-6 percent castor oil, 8-19 percent surfactant and the rest of water. The castor oil in the absorbent increases the solubility in surfactant micelle, thereby increasing the volume of the surfactant micelle and leading a whole liquid system to form the ordered organic combination; the organic ordered combination provides an organic micro-environment, the micro-environment can increase the solubility of methane, lead the methane to be wrapped in the organic micro-environment, and the gas absorbent is sprayed on the working surface of a mine to achieve the purposes of absorbing gas with excessive concentration and eliminating the safety hidden troubles which can cause explosion.

The invention discloses a device and method for detecting the acidity of sulfur hexafluoride gas, wherein the detecting device comprises a gas absorption cell and a pH sensor; the signal probe of the pH sensor is positioned in the gas absorption cell; a liquor outlet, a gas inlet and a plurality of automatic sample inlets are formed in the bottom of the gas absorption cell; a manual sample inlet and a gas outlet are formed in the top of the gas absorption cell; a pressure sensor is mounted beside the gas outlet; electromagnetic valves are respectively arranged between the liquor outlet and the gas inlet, the automatic sample inlets and the manual sample inlet, the gas outlet and the gas absorption cell. The device and method realize the quick absorption of the acidic materials in sulfur hexafluoride gas; the pH sensor is used to achieve instrumentation, so that the finish judgment with pure naked eyes in a titration process is avoided, the testing time is remarkably reduced, the accuracy of the test is significantly improved, the safe operation and supervision of aeration electrical equipment are powerfully guaranteed.

The invention relates to a calibration-free gas concentration measuring device and method. The device comprises a direct absorption spectrum device and a ring-down spectrum device, and gas chambers ofthe two devices are communicated with each other and share one laser. Emergent light of the laser is divided into two beams, one beam enters the direct absorption spectrum device, the other beam enters the ring-down spectrum measuring device; and time-sharing measurement of the two spectrum technologies is achieved through program control. According to the method, the gas concentration is obtained by directly fitting the transmission light intensity, and calibration-free measurement of the direct absorption spectrum is realized. And cavity ring-down time is calculated by utilizing the gas absorption rate measured by the direct absorption spectrum and the ring-down time of gas absorption contained in the ring-down spectrum measurement, so that the calibration-free measurement of the ring-down spectrum is realized. Measurement results are intelligently selected according to the measurement accuracy and ranges of the two spectrums, the measurement accuracy is about 10-20 ppm when the concentration is high and is smaller than 1 ppm when the concentration is low; calibration is not needed in the measurement process; and the device and method have the advantages of being high in measurement speed, easy to operate and the like.

The invention discloses a method and an apparatus for rapid determination of water body sediments AVS and SEM. The apparatus comprises a nitrogen cylinder (1), gas-washing bottles (2), reaction bottles (6) and gas absorption bottles (11). A gas-washing bottle (2), a reaction bottle (6) and a gas absorption bottle (11) that are successively installed in series by a pipeline form a branch; a plurality of branches in parallel connection are connected to the nitrogen cylinder; a gas flowmeter (2) is arranged in front of each gas-washing bottle (2) in each branch, and a gas flowmeter (2) is arranged after the nitrogen cylinder in a main road; the reaction bottles are sealed by rubber plug (9) coated with glass cement, and the rubber plug are provided with acid inlet apparatuses. According to the method, hydrogen sulfide gas generated from the reaction is extracted by high purity nitrogen and absorbed by a lye; and the parallel connection accelerates a measure speed; and links of sample introduction, reaction and absorption are reinforced to increase speed and accuracy. On the premise of measure precision guarantee, the AVS determination method of the invention can as shortens time effectively and achieves good effects.

The invention discloses a detection device for the nitrogen oxide content of a gas, which is used for detecting the concentration of nitrogen oxides contained in the gas. The detection device comprises a treater, a program-controlled current source, a laser, a gas absorption pool, a detector and a signal conditioner. By applying the detection device disclosed by the invention, a high-temperature conversion process is not needed, thus reducing power consumption and energy consumption; and moreover, because the content of the nitrogen oxides in the gas is directly measured, the influence of the existence of other substances on a content detection for the to-be-detected gas is avoided, so that the detection result is more accurate. Furthermore, because a ZrO2 sensor does not need to be used, the problem of poisoning of the ZrO2 sensor due to the compounds of P, S and Si, such as H2S is avoided. Meanwhile, because a ZrO2 sensor technology is a technology monopolized by foreign companies, and the ZrO2 sensor does not need to be used in the detection device disclosed by the invention, the existing technical barrier is broken.

In the embodiments described in the specification, a spark-ignited internal combustion engine has an exhaust line containing an oxide gas absorber for absorbing NOx and SOx and desorbing NOx and SOx at elevated temperatures. The support member for the oxide gas absorber is a metal foil or a thin walled ceramic support to permit rapid heating and is coated with a layer of a gas absorbing material at least 50 microns thick to permit longer intervals between regeneration, thereby providing effective storage of oxide gases even with fuel consumption-optimized engines.

The invention discloses an absorption cell for gas detection. The absorption cell comprises an optical fiber collimation module, a focusing module and a cavity located between the optical fiber collimation module and the focusing module, wherein the optical fiber collimation module comprises an optical fiber collimator, a precise dimming structure and an optical fiber collimation module fixing end; the focusing module comprises a focusing lens and a focusing module fixing end, and the optical axis of the focusing lens coincides with the central axis of a cavity air chamber and the optical axis of the optical fiber collimation module; two ends of the cavity are connected with the optical fiber collimation module fixing end and the focusing module fixing end in a sealed manner, the hollow part of the cavity is the air chamber for accommodating to-be-detected gas, and the lateral side of the air chamber is provided with a gas inlet and a gas outlet, and the top of the gas chamber is provided with threaded holes used for mounting at least one sensor for detecting parameters such as the temperature and the pressure of the gas chamber. The gas absorption cell is small in size, short in optical path, simple in structure, convenient to mount, debug and maintain, applicable to the detection of ppm-level dissolved gas in transformer oil, and the like.

A kitchen oil fume purification method. The oil fume is fully washed by the degreasing and cleaning liquid in the cleaning tower, and then sent to the electric dust removal tower to remove dust and purify harmful gases, and then the activated carbon absorption tower absorbs the irritating gas to purify the oil fume. . The invention comprehensively utilizes chemical and physical principles to purify kitchen oil fumes, has a simple structure, can be used continuously, does not require frequent maintenance, and has a long service life. The cleaning liquid in the circulating water liquid medicine pool can be replaced regularly, and the purification effect is good.

The invention provides a coal spontaneous combustion multicomponent index gas laser spectrum dynamic monitoring device with high sensitivity, good selectivity, stability and high reliability. The monitoring device comprises a coal spontaneous combustion multi-beam tube gas production and intelligent control unit, a coal spontaneous combustion multi-component index gas laser spectrum optical path and detection unit, and an explosion-proof housing. The coal spontaneous combustion multi-component index gas laser spectrum optical path and detection unit for gas suction and sampling feeds gas into three gas absorption tanks orderly connected. The coal spontaneous combustion multi-component index gas laser spectrum optical path and detection unit comprises an O2 gas laser spectroscopy system, a near infrared wavelength other gas laser spectroscopy system and a C2H6 gas laser spectroscopy system. The spectroscopy systems transmit acquired data into a multi-path data acquisition card for signal processing and storage. The concentration measurement result is displayed by an industrial personal computer. The device is mainly used for coal spontaneous combustion multicomponent index gas laser spectrum dynamic monitoring.

The invention discloses a device and a method for measuring the mean concentration of gas in open space. The device comprises a semiconductor laser, a semiconductor laser controller, an optical fiber coupler, an erbium-doped optical fiber amplifier, a photoelectric detector, an optical transceiving antenna, a single-mode optical fiber and a data processing unit. According to the method, a cavity ring-down technology is used to measure the cavity ring-down time of a laser at a wavelength of an absorption spectrum peak of to-be-measured gas and a laser at a wavelength out of the absorption spectrum range respectively, the absorption coefficient of the gas is obtained through calculation, and then the absolute concentration of the gas is solved through calculation according to the relation of the gas absorption coefficient, the absorption section and the concentration; meanwhile, a detection distance calculated through measurement of the time interval of ring-down pulse; the mean concentration of the gas is obtained through calculation on the basis of the known integrated concentration of the gas in the open space and detection distance. The method has the characteristics of high measurement sensitivity and high anti-interference capacity.