688 results about "Gas analyzer" patented technology

The invention discloses a traceable flue gas flow measurement system and method for a large-diameter chimney, and belongs to the field of flue gas flow measurement. The system comprises a tracer gas cylinder used for containing a tracer; the flow controller is used for controlling the output flow of the tracer agent; the tracer agent output from the flow controller is injected into the upstream position of the chimney pipeline through the tracer agent injection probe so as to be mixed with the flue gas; the tracer sampling probe is mounted at the downstream position of the chimney pipeline and is used for extracting a mixed gas sample through a gas pump; and the gas analyzer is used for analyzing the obtained gas sample and calculating the volume flow rate of the flue gas in the chimney pipeline. According to the invention, the volume flow of the flue gas in the chimney is directly calculated by monitoring the concentration change of the tracer agent in the flowing process in the pipe, so that the accuracy of flow measurement is improved, and the measurement result has traceability.

The invention discloses a multi-head gas analysis device, and relates to the technical field of infrared gas analyzers, the multi-head gas analysis device comprises a sampling joint body, and the sampling joint body comprises a sampling tube, a threaded port, a double-head connecting tube, an upper steel ball and an upper spring. In the using process, through the structural arrangement that the multiple sets of sampling connector bodies are arranged on the side end edge of the infrared gas analyzer side by side, the sampling requirements of the multiple sets of sampling tank bodies can be met, and the number of to-be-detected samples and the detection efficiency are effectively improved; the establishment of a gas passage from the sampling tank body to the sampling pipe is controlled through gas pressure, so that the to-be-detected gas samples in the sampling tank body at multiple positions can be sequentially detected, and the gas samples in the sampling cavity can be uniformly and thoroughly discharged into the infrared gas analyzer to be detected; and the to-be-detected gas sample in the sampling cavity is isolated from the introduced high-pressure gas by the piston plate, so that the detection precision of the to-be-detected gas sample can be guaranteed.

Aspects relate to a compact and low-cost gas analyzer that can be used for different types of gas analysis, such as air quality analysis. The gas analyzer can include a light source, a gas cell configured to receive a sample (e.g., a gas under test), a spectral sensor including a spectrometer and a detector, and an artificial intelligence (AI) engine. Light can enter the gas cell and interact with the sample to produce output light that may be measured by the spectral sensor. The resulting spectrum produced by the spectral sensor may be analyzed by the AI engine to produce a result. The gas analyzer further includes a self-calibration component configured to enable calibration of the sample spectrum to compensate for spectral drift of the spectral sensor.

The invention relates to the technical field of gas detection, and provides a doped gas concentration detection method and system based on a gas analyzer. The method comprises the following steps: constructing a standard spectrum database under the same pressure and temperature as a to-be-measured site; the method comprises the following steps: introducing sample gas into an optical absorption cell, carrying out wavelength scanning through a tunable diode laser in a plurality of adjacent absorption spectral line intervals containing target gas and interference gas, superposing a high-frequency sinusoidal modulation signal on a driving current, and synchronously detecting a second harmonic component of transmission laser to generate an actual measurement spectrum; fitting the actually measured spectrum with a synthetic spectrum generated on the basis of a standard spectrum database, and outputting a target gas concentration ratio as a detection result when a residual error meets a threshold value, so as to solve the technical problem that the detection precision is reduced due to spectrum overlapping caused by interference gas, and achieve the purpose that the detection precision is reduced by constructing the standard spectrum database and second harmonic spectrum fitting analysis. And the accuracy and the anti-interference capability of gas detection are improved.

The invention discloses a lime kiln monitoring system based on multi-source data dynamic fusion, which is characterized by comprising a thermal imager, an infrared sensor, a pressure sensor, a gas analyzer and an edge computing node, the edge computing node is configured with a Raspberry Pi platform and an LSTM neural network accelerator and is used for executing multi-source data preprocessing and feature compression, and the Raspberry Pi platform and the LSTM neural network accelerator are connected with the thermal imager. The system also comprises a working condition analysis system, and the working condition analysis system comprises a ring formation prediction model based on ST-GCN, a combustion optimization model based on DDPG, and an anomaly detection model based on an isolated forest and automatic encoder hybrid model. The invention aims to solve the limitation of a traditional monitoring system, realize real-time monitoring and accurate control, improve the equipment health management and predictive maintenance capability, optimize waste heat recovery and energy utilization, and enhance man-machine interaction and operation convenience.

The invention provides a gaseous pollutant Fourier transform infrared spectroscopic analysis method based on deep learning. The gaseous pollutant Fourier transform infrared spectroscopic analysis method comprises the following steps: acquiring infrared absorbance spectrums of different gases to be detected by utilizing a Fourier transform infrared gas analyzer; the method comprises the following steps of: preprocessing the collected spectral data, namely carrying out segmented denoising on the original spectral data by adopting a self-adaptive Savitzky-Golay filter, and carrying out normalization processing to balance a data range; carrying out feature extraction on the preprocessed spectral data by utilizing a one-dimensional convolution deep learning model so as to adapt to one-dimensional FTIR spectral features and realize feature extraction of multiple components of gas; mapping the extracted features to a prediction result of the to-be-detected component by applying a full connection layer of the model; and training and optimizing the model by adopting an MSE regression loss function. According to the invention, the processing capability of the gaseous pollutant spectral signal can be effectively improved, and high-precision multi-component quantitative analysis is realized.

The invention discloses a cable fault diagnosis method and system based on ablation gas of a semi-conductive resistance water buffer zone, and the method comprises the steps: extracting gas in a to-be-detected cable buffer layer through a gas collection assembly disposed outside a main insulation part of a cable body; analyzing the gas in the buffer layer of the to-be-detected cable through a cable characteristic gas analysis instrument to obtain the concentrations of hydrogen and propane in the buffer layer of the to-be-detected cable; and comparing the hydrogen concentration with the hydrogen concentration of the cable in a normal operation state, and determining the operation state of the cable to be detected according to the propane content. The problem that the detection time is interfered or missed in the prior art is solved, and whether the semi-conductive resistance water buffer strip is ablated or not can be rapidly and accurately detected and judged.

The laser gas analyzer comprises a protection box with an opening in the top, a box cover is hinged to the side wall of the protection box, a mounting plate is slidably connected to the inner wall of the protection box, an analyzer body is arranged on the upper surface of the mounting plate, a lifting assembly is mounted in the protection box, and the lifting assembly comprises a double-end screw rod, a bottom block and a supporting plate; the upper ends of the supporting plates are rotationally connected with the bottom of the mounting plate, the two bottom blocks are symmetrically arranged on two sections of threads of the double-end lead screw, the two supporting plates are arranged in a staggered mode, a driving assembly is mounted on the protection box, the protection box plays a role in protecting the analyzer body, the probability that the analyzer body is damaged due to external force collision or careless falling is reduced, and the analysis accuracy is improved. When the analyzer body needs to be used, the box cover is opened, and the driving assembly drives the double-end lead screw to rotate, so that the two bottom blocks move close to each other, the two supporting plates are driven to ascend in a crossed mode, the mounting plate moves upwards, the analyzer body is lifted out of the protection box, and protection and use of the analyzer body are facilitated.

The invention relates to the technical field of coal mine safety monitoring, in particular to a coal spontaneous combustion temperature prediction method based on an ACO-BP neural network model. The method comprises the following steps: carrying out gas collection on a space in which coal is located through gas monitoring equipment at preset time intervals to obtain gas corresponding to the coal; component and concentration analysis is conducted on the gas through a gas analyzer, a gas concentration data set is obtained, and the gas concentration data set comprises concentration data corresponding to at least one gas; and inputting the gas concentration data set into a target ACO-BP neural network model for identification processing, predicting a first temperature corresponding to the coal, and determining spontaneous combustion information of the coal according to the first temperature. According to the invention, the accuracy and convenience of coal spontaneous combustion temperature prediction can be improved.

The invention discloses a device and a method for identifying a relationship between sediment bubble state methane and water body soluble methane. The device comprises a culture box, an acrylic column fixed in the culture box, a flux box hoisted at the top in the acrylic column, a gas analyzer communicated with the flux box through a circulating pipeline and a bubble blocking structure fixedly arranged in the middle of the acrylic column, and the side wall of the acrylic column is provided with an overflow port and is connected with a peristaltic pump through the overflow port and a pipeline; the input end of the water-gas balancing device is further connected with an inert gas supply tank, and the output end of the water-gas balancing device is connected with a gas analyzer. The method realizes simple and efficient control of a methane release path in the sediment, is helpful to identify the influence of the sediment on the methane release flux of a water-gas interface, and is expected to demonstrate that the water soluble methane mainly comes from sediment bubble release and to demonstrate that the water soluble methane is mainly from the bubble release of the sediment under the condition of considering the bubble state methane release. The methane release flux of the shallow water body is far greater than the diffusion release flux.

The invention discloses a fertilizer storage monitoring system based on the Internet of Things. The fertilizer storage monitoring system comprises an environment sensing module, an equipment control module, a communication networking module, a central processing platform and a user terminal module, the environment sensing module comprises temperature and humidity sensors, a gas concentration detector, a pressure sensor and a three-dimensional space positioning device which are distributed at different positions of a storage space, the temperature and humidity sensors are deployed by adopting a honeycomb topological structure, and each temperature and humidity sensor comprises a dual-mode temperature and humidity probe and a self-calibration circuit; the gas concentration detector comprises an ammonia gas sensor, a methane sensor and a multispectral gas analyzer. When the warehousing system is monitored, the environment where the fertilizer is located can be comprehensively mastered by monitoring information such as the temperature, the humidity, the gas concentration and the pressure in the warehousing space, whether the fertilizer goes bad or is prone to going bad or not is judged, and the problems that manual judgment is not standard and not accurate are completely eradicated.

The invention discloses a defect self-detection laser welding device and belongs to the field of laser welding, a driving disc is assembled at the top of an electric rotating disc, the driving disc is fixedly connected to the top of a gas analyzer body, a pawl is hinged to the inner wall of the driving disc, and a connecting ring is rotatably connected to the outer wall of a fixing rod; and the inner wall of the connecting ring is fixedly connected with a connecting rod. The steel pipe is fixed to the top of the base, the electric rotating disc is started to drive the welding gun body and the gas analyzer body to rotate forwards and backwards, welding operation and detection work of the steel pipe can be accurately completed, after laser welding is completed, the air pump is started to inject gas into the steel pipe, and the gas analyzer rotates and analyzes gas components of the steel pipe; the pawl and the ratchet wheel are driven by the driving disc to rotate clockwise, and the two ends of the steel pipe are blocked by the hydraulic system, so that the accuracy of a gas analysis process is guaranteed, and whether defects and gas leakage exist in the steel pipe is detected.

The application provides a multi-gas control device, a use method and an application, and relates to the technical field of biological gas fermentation. The device comprises a gas supply module, the gas supply module comprises multiple groups of gas sources and connecting pipelines, each gas source is connected to an air inlet pipeline through a respective connecting pipeline, a secondary pressure reducing valve, a T-shaped filter, a mass flow meter, a stop valve, a regulating valve and a check valve are sequentially arranged on the connecting pipeline, the air inlet pipeline is connected to a liquid circulation pipeline, gas is discharged from a spraying mechanism connected to the liquid circulation pipeline, the spraying mechanism is arranged in a fermentation tank, the spraying mechanism is connected to a circulating pump through the liquid circulation pipeline, the circulating pump is connected to the bottom of the fermentation tank through a pipeline, the top of the fermentation tank is connected to a detection pipeline, and a precision filter, a vacuum pump, a drying device, a pre-analyzer and a gas analyzer are sequentially arranged on the detection pipeline. The application realizes efficient absorption and utilization of multiple gases, and simultaneously obtains high yield and high quality single-cell protein.

The invention relates to the technical field of ecological environment monitoring, in particular to a damping connecting device of an open circuit gas analyzer for a fixed-wing unmanned aerial vehicle, and the damping connecting device comprises an outer connecting ring, an inner connecting ring, a damper, an adapter and a fixed part; the adapter is mounted on the fixed part, and the mounting surface of the adapter is obliquely arranged according to a preset angle; the outer connecting ring is suspended on the mounting surface; the inner connecting ring is suspended through a plurality of shock absorbers and is detachably connected to the interior of the outer connecting ring; the multiple shock absorbers are arranged in the circumferential direction of the outer connecting ring. And an insertion hole is formed in the inner connecting ring. The whole device is fixedly connected with the cabin bottom plate of the fixed-wing unmanned aerial vehicle only through the fixing piece, so that the connecting surface between the damping connecting device and the cabin is greatly reduced, and a vibration source can be conducted to a gas analyzer only from the fixing piece; therefore, the influence of vibration sources such as aircraft jittering caused by turbulent flow in the operation and flight processes of the engine and the propeller of the unmanned aerial vehicle on the precision of data monitored by the gas analyzer is reduced.

The invention discloses an underwater in-situ gas analyzer suitable for deep sea extreme environment, which comprises a pressure-resistant cabin body, the pressure-resistant cabin body comprises a main body cabin, a front end cover and a rear end cover are respectively mounted at two ends of the main body cabin, a fixed bracket is fixedly connected in the main body cabin, and a vacuum detection cavity, a primary vacuumizing pump and a secondary vacuumizing pump are mounted on the fixed bracket. The primary vacuumizing pump and the secondary vacuumizing pump are both communicated with the vacuum detection cavity, the vacuum detection cavity is communicated with a gas component analyzer, a vacuum air pressure detection device is installed on the vacuum detection cavity, and the underwater in-situ degassing device is communicated with the vacuum detection cavity through a pipeline. And the first-stage vacuumizing pump, the second-stage vacuumizing pump, the gas component analyzer and the vacuum air pressure detection device are electrically connected with the control circuit system. The device can stably and continuously work in a deep-sea high-pressure low-temperature environment, is convenient to disassemble, assemble, transport and maintain, and can be widely applied to extreme environments such as deep-sea hydrothermal liquid, cold springs and hydrogen-rich nozzles.

The invention discloses an atomic layer deposition gas supply system for a low saturated vapor pressure precursor source, and belongs to the technical field of atomic layer deposition reaction equipment. According to the system, a mass flow controller is combined with an original gas inlet pneumatic valve, so that the gas quantity in a precursor source bottle in the deposition process is accurately controlled; the pressure in the precursor source bottle is monitored in real time through a pressure meter, so that the temperature in the deposition process is accurately controlled; in addition, specific contents of precursor source gas and auxiliary gas in source gas are monitored in real time through a gas analyzer at a source outlet, so that a system is assisted to judge whether reaction gas needs to be supplemented or not; the mass flow controller, the pressure meter and the gas analyzer are all connected with the PLC, and control of all the parts is achieved through the PLC; and gas control, pressure monitoring and component monitoring of the low saturated vapor pressure precursor source in the experiment process are realized.

The invention discloses a multi-component laser gas analyzer based on front-end pretreatment, and relates to the technical field of gas detection, the multi-component laser gas analyzer specifically comprises a portable box, a control panel is arranged in the portable box, and a laser gas analysis mechanism is mounted in the portable box and located at the bottom of the control panel; the problem of spectral signal distortion caused by a high-dust and high-humidity environment in industrial gas detection is solved through a front-end pretreatment self-adaptive technology, system downtime caused by single-path blockage is avoided through a double-pipeline redundancy design aiming at the high-dust and high-humidity environment, rapid dehumidification and cooling of a compression and condensation assembly are combined, and the detection efficiency is improved. According to the multi-component laser gas analyzer system, a laser gas analysis mechanism can stably obtain high-precision spectral signals under complex working conditions, meanwhile, multi-stage intelligent early warning and filter element health management are adopted in the system, the maintenance cost is reduced, the service life of equipment is prolonged, the integrated design of the portable box supports on-site rapid overhaul, and the detection efficiency of the whole multi-component laser gas analyzer is improved.

The invention discloses a dual-gas analysis instrument for a nuclear power station. The dual-gas analysis instrument comprises a control cabinet located in a first area and a sampling test cabinet located in a second area, the control cabinet is in signal connection with the sampling test cabinet; the sampling test cabinet comprises a sampling pipeline and a monitoring module which are communicated in sequence; the monitoring module comprises an oxygen monitoring module and a hydrogen monitoring module; wherein the monitoring module is also connected with a purging pipeline and a calibration pipeline; the sampling test cabinet is communicated with the nuclear waste gas pipeline, continuous sampling is performed from the sampling test cabinet through the sampling pipeline, and then the hydrogen and oxygen content in the to-be-detected gas is monitored through the monitoring module, so that continuous detection of the nuclear waste gas can be realized, and the monitoring risk caused by transfer of the nuclear waste gas is avoided.

A gas emission monitoring system is configured for versatile deployment across various sites, including gas extraction locations, industrial settings, and environmental monitoring areas. The system may include a support structure holding a plurality of tubings, each equipped with at least one intake port. The tubings may be interconnected through a connecting tubing that ultimately links to an analysis tubing feeding into a gas analyzer. The design ensures that the intake ports are strategically positioned at different vertical levels relative to the ground, for example, for optimized air sampling. The gas analyzer may be configured to identify multiple types of gas content in a received air mixture, which is collected from the various intake ports. Thus, the systems discussed herein may provide a comprehensive, adaptable solution for real-time gas monitoring, capable of handling a broad range of gases and environmental conditions.

The invention relates to the technical field of gas charging and distributing, in particular to a mixing device and a mixing method of a gas charging and distributing system. The invention discloses a mixing device and a mixing method of a gas charging and distributing system. The device comprises a mixing tank, a stirring device, a gas analyzer and a control system, wherein the mixing tank is a stainless steel vertical tank, the stirring device is arranged at the bottom of the mixing tank and comprises fan blades, a magnetic transmission device and a motor, the motor is installed outside the mixing tank, the magnetic transmission device and the fan blades are installed inside the mixing tank, and the magnetic transmission device is connected with the external motor and used for converting rotation of the motor into rotation of the fan blades; the gas analyzer is connected with the mixing tank through an upper group of one-way valves, a middle group of one-way valves, a lower group of one-way valves, electromagnetic valves and pipelines, and is used for monitoring the concentrations of mixed gases at the upper part, the middle part and the lower part; the gas analyzer is connected with the control system through a data acquisition link, and the control system is used for controlling the rotating speed of the stirring device according to the concentration of each mixed gas uploaded by the gas analyzer through a proportional-integral-derivative control algorithm.

Devices, systems, and methods for determining dissolved gas characteristics in an electrical transformer to monitor transformer operation. An extraction coil for contact with the transformer fluid includes a gas permeable material for receiving dissolved gas which is circulated through a gas circuit to a gas analyzer and gas cell. The extraction coil may include a number of coil loops. The gas analyzer may comprise a light source, a beam splitter, a cell detector and a reference detector.

The utility model discloses a process parameter experiment and selection device for harmless treatment of chemical waste salt, which comprises a reaction furnace, a movable reaction device, a gas inlet pipe, a gas cylinder, a gas outlet pipe, a cold trap and a gas analyzer, the movable reaction device is mounted at an opening in the lower end of the reaction furnace through a sealing flange, and comprises a sample bearing part for feeding a sample into the reaction furnace; a gas inlet pipe is arranged in the movable reaction device, and the gas cylinder is connected with a gas inlet of the gas inlet pipe and used for inputting reaction atmosphere into the reaction furnace; gas generated by the reaction of the sample in the reaction furnace is output through an upper end gas outlet pipe; the cold trap is used for cooling and filtering gas generated by reaction; and the gas analyzer is connected with the cold trap and is used for performing component analysis on the gas filtered by the cold trap. According to the utility model, technological parameters of harmless treatment can be quickly determined by using a small amount of waste salt.

The invention relates to the field of gas mixing systems, and discloses a gas mixing system based on high-pressure proportional valve control. The system comprises at least two gas branches, and each gas branch is provided with a high-pressure proportional valve communicated with a gas inlet and a one-way valve located at the downstream of the high-pressure proportional valve. The mixing unit is used for mixing the gas of each gas branch in a high-pressure state; the energy storage unit is communicated with the mixing unit and is used for temporarily storing the mixed high-pressure gas; the detection control unit comprises a gas analyzer communicated with the energy storage unit and a controller electrically connected with the gas analyzer, and the controller adjusts the opening degree of the high-pressure proportional valve in a closed-loop mode according to detection signals of the gas analyzer, so that the target component concentration of the mixed high-pressure gas is maintained within a preset range. The system can directly realize accurate proportioning and dynamic adjustment of multi-component gas on a high-pressure side, reduces lag and energy consumption of a low-pressure mixing scheme, and is suitable for high-pressure laser welding, material testing and other scenes needing quick response and high-precision proportion control.

It is preferable that a single gas analyzer be capable of handling a wide measurement range. [Solution] A first reference relationship between a wavelength of light and a reference absorbance of light by the reference gas when a reference gas is irradiated with light is determined in advance. The gas analyzer includes an acquisition unit that acquires a target relationship between a wavelength of light and a target absorbance of light by the target gas when a target gas of the same type as the reference gas is irradiated with light, and a calculation unit that calculates a concentration of the target gas based on the first reference relationship and the target relationship in a wavelength range determined according to the magnitude of the target absorbance acquired by the acquisition unit.

The invention discloses an in-situ laser gas analyzer, and relates to the technical field of gas detection, the in-situ laser gas analyzer comprises two sets of detection systems, each detection system comprises a filter assembly, a gas pump, a flowmeter and a sensor which are connected in sequence, and the gas outlet end of each filter assembly is connected with a blowback pipe; a flow dividing pipe and a calibration pipe are sequentially connected to the portion, between the air pump and the flow meter, of the air conveying pipe in the air conveying direction, the calibration pipe is connected with the air conveying pipe through a three-way valve, and the three-way valve is used for controlling the flow meter to be selectively communicated with the air pump or the calibration pipe. According to the in-situ laser gas analyzer, the gas pump is arranged between the filtering assembly and the sensor to overcome the resistance of the filtering assembly, and part of gas is guided and discharged through the flow dividing pipe, so that measurement errors caused by too large flow are avoided; in addition, the flow meter is used for detecting the gas flow entering the sensor so as to judge whether the gas flow is in a preset range or not, and the gas detection accuracy is ensured.

The invention discloses a closed-loop type mixed gas flux measurement system, and relates to the technical field of flux measurement, a gas path structure of a gas analyzer in the measurement system is designed by combining serial gas pools with a sucking pump, and a group of TDLAS sensors are arranged at a phosgene gas path of each gas pool respectively; the specifications of the phosgene paths of the gas pools and the TDLAS sensors are matched and designed according to the characteristics of various to-be-detected gases, and in the gas extraction process of the gas extraction pump, the measurement host performs concentration calculation by using data of the TDLAS sensors and then completes transmission time delay compensation with the three-dimensional ultrasonic wind, so that the concentration measurement results of the various to-be-detected gases can be obtained through calculation. Cross interference of different gases is avoided, and synchronous measurement of various to-be-measured gases can be basically realized in an error range, so that the accuracy, reliability and efficiency of flux measurement are improved, and all-day and all-weather measurement of flux can be realized.

The invention discloses an ultraviolet absorption gas analyzer, and relates to the technical field of gas analyzers. The ultraviolet absorption gas analyzer comprises an analyzer outer shell, the analyzer outer shell is connected with a first supporting seat and a second supporting seat, the first supporting seat is fixedly connected with a light source supporting seat, the light source supporting seat is provided with an ultraviolet light source generator, a rotating disc is rotatably connected between the first supporting seat and the light source supporting seat, and the rotating disc is provided with a rotating shaft. A plurality of groups of optical filter main bodies are arranged on the rotating disc, a measuring air chamber is arranged between the first supporting seat and the second supporting seat, and a light source receiver is arranged on the second supporting seat. According to the ultraviolet absorption gas analyzer, on one hand, protection is provided for the optical filter main body, the optical filter main body is isolated from the external environment, on the other hand, when the optical filter main body is replaced, the replacement of a plurality of groups of optical filter main bodies can be realized only by rotating the rotating disc, and the replacement process is convenient to operate, time-saving and labor-saving.

The utility model discloses a protection structure for a laser window lens of an in-situ laser gas analyzer, which comprises a purging guide ring, a window lens support, a window lens compression ring and a purging shielding gas interface, and is characterized in that the purging guide ring, the window lens support and the window lens compression ring are respectively arranged in a window lens sleeve; the purging shielding gas interface is mounted on the window lens sleeve, and the window lens is positioned between the window lens support and the window lens compression ring; and the purging guide ring is positioned on the outer side of the window lens. When the protection structure is installed on the in-situ laser gas analyzer, when the in-situ laser gas analyzer works, the blowing protection airflow can effectively reduce the temperature of a laser window lens and stabilize the working temperature of the laser window lens; and external dust, particles, harmful gas and the like are prevented from polluting and corroding the window lens and blowing and cleaning the window lens.

The invention provides a vehicle tail gas detection device, and relates to the technical field of tail gas detection, the vehicle tail gas detection device comprises a gas analyzer, the front end of the gas analyzer is provided with a connecting pipe, the outer side of the connecting pipe is provided with a gas inlet assembly, the gas inlet assembly comprises a storage pipe, and one end of the storage pipe is slidably inserted with an insertion pipe; compared with the prior art, the gas inlet assembly can be inserted into a tail gas pipe to receive tail gas, the tail gas is fed into a gas analyzer to be detected through communication of the gas feeding assembly and the connecting pipe, and after each detection is completed, the tail gas is fed into the gas analyzer to be detected through the gas feeding assembly. The gas inlet assembly is withdrawn to automatically clean the inner wall of the analyzer, the two gas supply assemblies are used alternately, the interior is kept clean in a cleaning mode, meanwhile, tail gas is dispersed and conveyed through a plurality of branch pipes, most of heat of the high-temperature tail gas is conveniently dissipated, and electronic elements in the analyzer are prevented from being damaged.

The invention relates to the technical field of food preservation, in particular to a food preservation system and method, and the food preservation system comprises a detection assembly, a gas transmission assembly and a plurality of preservation cavities. The fresh-keeping cavity is provided with an air inlet valve, an air outlet valve, a temperature sensor and a circulating refrigeration component; the detection assembly comprises a detection cavity provided with a detection inlet and a detection outlet, a gas extraction part communicated with the plurality of gas outlet valves and used for extracting gas to the detection inlet, and a gas analyzer mounted in the detection cavity, and the gas analyzer is used for detecting the content of oxygen, carbon dioxide and ethylene; the gas conveying assembly communicates with the multiple gas inlet valves and is used for outputting oxygen, carbon dioxide and nitrogen. By means of the fruit and vegetable cold storage fresh-keeping device, fruits and vegetables can be subjected to cold storage fresh-keeping in a partitioned mode, the gas temperature and the gas content of oxygen, carbon dioxide and ethylene in each fresh-keeping cavity are controlled in the fresh-keeping process, it is ensured that the content of the three gases is kept within a controllable range, and the fruit and vegetable cold storage fresh-keeping qualification rate and the cold chain storage economic benefit are improved.