629 results about "Methane gas" patented technology

The invention discloses a ppb-grade methane gas online detection method, equipment, a medium and a product, and relates to the field of data processing. The method comprises the following steps: acquiring an infrared absorption spectrum signal, and obtaining original spectrum data; performing multi-scale noise separation and baseline correction on the original spectral data to obtain de-noised effective spectral features, and extracting methane specific absorption peaks from the de-noised effective spectral features; comparing the methane specific absorption peak with the interference gas spectral line through a multi-spectral line weight matching algorithm to obtain methane characteristic intensity; carrying out self-adaptive calibration on the methane characteristic intensity according to the drift compensation model to obtain calibrated characteristic intensity; obtaining a ppb-level methane concentration value through a concentration inversion model; and inputting the sorted concentration time sequence data into an anomaly detection model to detect a methane leakage event. By designing signal processing and algorithm analysis, the dependence on equipment hardware performance is reduced, and the use cost of ppb-level methane gas detection is reduced.

The invention belongs to the technical field of oil-gas field development, and particularly relates to a method for testing the content of adsorbed gas in a coal bed gas diffusion process. The problem that the desorption degree of coal bed gas cannot be clearly known at present is solved. According to the technical scheme, high-temperature and high-pressure isothermal adsorption experiments under the condition of different gas proportions are carried out, methane adsorption-desorption capacity of mixed gas of different proportions under different partial pressures is determined, gas diffusion experiments are carried out to evaluate gas migration capacity in the diffusion process and methane gas partial pressure distribution in a sample, and different experiment results are synthesized to determine the methane gas content of the sample. The desorbed gas content in the coal bed gas diffusion process can be calculated; according to the new method, the proportion of the methane desorption gas amount in the coal bed gas development process can be calculated, and the desorption degree of the adsorbed gas of the coal bed reservoir is evaluated.

The invention discloses a method for preparing methylaluminoxane by directly hydrolyzing trimethyl aluminum and a reaction device, and belongs to the technical field of chemical products. Comprising the following steps: introducing low-temperature methane gas containing gas-phase water into a trimethylaluminum organic solution, carrying out hydrolysis reaction under the dual effects of ultrasonic vibration and mechanical stirring and mixing, and filtering to remove solid substances after the reaction is completed, so as to obtain a methylaluminoxane solution. According to the method for preparing methylaluminoxane through direct hydrolysis of trimethyl aluminum, the hydrolysis quality of methylaluminoxane can be guaranteed, generation of gels such as aluminum hydroxide is effectively controlled, and the product yield is greatly increased; and the byproduct methane is high in purity, can be recycled and is free of environmental pollution and energy waste, so that the production cost is remarkably reduced.

The invention discloses a methane laser sensor device which comprises a laser device, the laser device comprises a laser emitting unit and a sealing cap, a closed cavity is formed between the laser emitting unit and the sealing cap, and the closed cavity is filled with methane gas with preset concentration; laser emitted by the laser emitting unit is emitted after passing through methane gas in the closed chamber; the first photoelectric sensor receives laser emitted by the laser and outputs a first electric signal; the control module acquires a first electric signal output by the first photoelectric sensor; according to the first electric signal, the position offset of the methane absorption peak in a laser wave band emitted by the laser is determined or the range of driving current output to the laser is increased, and then the position offset of the methane absorption peak is calculated; driving current output to the laser is adjusted according to the position offset, so that the methane absorption peak is located in the central wave band of laser emitted by the laser. The detection failure of the laser methane sensor is avoided, and the detection precision of the laser methane sensor is improved.

The invention discloses a system and a method for measuring the release flux of methane in a water body, and belongs to the technical field of measurement of the release flux of methane gas in the water body. When the diffusion flux is measured, the box body is placed on the liquid level of the water body in a floating manner, and the partition plate is arranged below the first opening of the box body at the interval of the first preset distance, so that methane gas released in the form of bubbles in the water body below the partition plate can be prevented from entering the accommodating cavity, and the interference of bubble release on the measurement result can be reduced; the determination accuracy of the diffusion flux is improved. When the bubble flux is measured, the cover body covers the sediment at the bottom of the water body below the box body, and the methane gas released by the sediment is collected by the gas collection container below the liquid level, so that the probability that bubbles are dissolved in the water body in the floating process can be reduced, and the measurement accuracy of the bubble flux is improved.

A continuous monitoring method for methane emission of a mine return airway is characterized in that a methane concentration detection method is realized by combining DAS with a WMS technology, the WMS technology has good linearity when the concentration is low, when the absorbance is close to an absorbance threshold value A0, a nonlinear effect begins to appear, and the gas concentration cannot be accurately inverted, at the moment, the DAS technology shows good linearity, and the WMS technology shows high linearity when the gas concentration cannot be accurately inverted. And the detection range can be greatly improved. Therefore, the concentration detection of the methane gas in the whole range can be realized by combining the DAS with the WMS technology, and by setting a proper absorbance threshold value A0, when the absorbance of the detected gas to be detected is lower than the set threshold value, the WMS technology is adopted to ensure the measurement accuracy of the detection system under the low-concentration condition; when the absorbance of the detected to-be-detected gas is higher than a set threshold value, the DAS technology is adopted for detection, so that the nonlinear problem caused by adopting the WMS technology is avoided. The method has high sensitivity to the detected change of the volume concentration of the methane, and the change of the volume concentration of the methane can be detected in time.

The invention belongs to the technical field of diamond preparation, and discloses a high-speed preparation method of a thick diamond film, which comprises the following steps of: uniformly spreading diamond particles on a substrate by using absolute ethyl alcohol, placing the substrate on a sample table in an MPCVD (Micro-Pressure Chemical Vapor Deposition) system, and introducing hydrogen, slowly heating the interior of the MPCVD system to a preset cleaning temperature so as to perform plasma cleaning on the surface of the substrate, and growing the substrate on the basis of the growth hydrogen flow, the methane gas flow, the growth power, the growth temperature and the growth air pressure through a segmented growth method, promoting the growth of nano-scale diamonds in gaps of the diamond particles on the surface of the substrate to connect the diamond particles to obtain a compact and uniform rough thick diamond film, and polishing the rough thick diamond film to obtain a thick diamond film with a smooth surface; the thick diamond film is grown on the substrate on which a layer of diamond particles are paved by using hydrogen and methane gas through a segmented growth method, so that the high-speed preparation efficiency of the thick diamond film is improved.

The invention discloses a metal-doped modified zeolite molecular sieve adsorbent as well as a preparation method and application thereof. The metal-doped modified zeolite molecular sieve adsorbent comprises a carrier and an active metal component loaded on the carrier, the carrier is a mordenite molecular sieve; the active metal components comprise at least two of Ca, Mg, Ti, Fe, Ni, Co, Cu, Zn, Na and Ag; in the adsorbent, the loading capacity of the active metal component is 0.1%-15%. The adsorbent provided by the invention has good separation performance on CH4 / CO2, CH4 / N2, CO2 / N2 and CH4 / CO2 / N2 mixed gas separation systems, has the advantages of simple synthesis method, strong hydrothermal stability, high selectivity and the like, and can meet the requirements of CH4 purification in unconventional natural gas such as landfill gas, sewage treatment methane gas, agricultural and breeding biogas, coal bed gas, shale gas and shallow biogas, and the like. And the requirements of high-concentration natural gas denitrification, CO2 capture and other scenes can be met.

An experimental apparatus for planar interfacial shear of a hydrate-bearing sediment includes a planar interfacial shear box, a torsional and axial loading device, a nitrogen gas source, a methane gas source, a pressure-volume controller, a water bath device, a back pressure valve, a gas-water separator, a gas flowmeter, and a data acquisition system. The planar interfacial shear box includes an upper pressing plate, an upper adapter, an upper thermal insulation plate, a ram adapter, a lower ram, an upper base, a lower base, a lower thermal insulation plate, a lower adapter, and a lower pressing plate that are coaxially connected in sequence from top to bottom. The experimental apparatus offers a simple specimen preparation method, enabling in-situ formation of a hydrate-bearing sediment in the shear box. The experimental apparatus ensures uniform stress distribution during shearing, and can acquire the interfacial shear mechanical characteristic between the hydrate-bearing sediment and a structure.

A raw material mixed gas supply line 13 is connected to a gas inlet of the first gas separation membrane unit 11. The non-permeated gas discharge port 11b of the first gas separation membrane unit 11 and the gas inlet of the second gas separation membrane unit 12 are connected by a first non-permeated gas discharge line 14. A second non-permeated gas recovery line 15 is connected to the second non-permeated gas discharge port 12b of the second gas separation membrane unit 12. The first permeated gas discharge port 11c of the first gas separation membrane unit 11 and the second permeated gas discharge port 12c of the second gas separation membrane unit 12 are connected to the raw material mixed gas supply line 13 by a first permeated gas recycle line 16 and a second permeated gas recycle line 17, respectively. The line 16 includes a permeated gas discharge line 18 for at least partially discharging the permeated gas of the first gas separation membrane unit to the outside of the system.

The invention discloses a preparation method of GaN / diamond with low interface thermal resistance, and aims to solve the bottleneck problems of interface failure, high interface thermal resistance and the like caused by growth of diamond on a GaN substrate. The preparation method of the GaN / diamond with low interface thermal resistance comprises the following steps of: 1, ultrasonically cleaning a GaN substrate; 2, carrying out reverse sputtering cleaning on the GaN substrate; 3, sputtering and depositing a Si3N4 transition layer on the GaN substrate; 4, ultrasonic cleaning; 5, spin-coating the nano-diamond suspension liquid on the GaN substrate; 6, introducing hydrogen, oxygen and methane gas, and depositing a diamond layer in stages; 7, depositing a diamond layer at a first stage under low pressure; and 8, depositing a diamond layer at a second stage under high pressure. The GaN / diamond material with low interface thermal resistance is prepared through a multi-temperature gradient low-temperature growth process in combination with collaborative optimization of air pressure and time, and gradient heat flow control is combined with stress buffering of the Si3N4 transition layer, so that the integrity of the Si3N4 film is ensured.

The invention discloses a porous carbon preparation method and a continuous fluidized bed system.The porous carbon preparation method comprises the steps that rice husks and bamboo fibers are mixed and smashed, the smashed rice husks and bamboo fibers are dried and then mixed with a composite activating agent solution to be steeped, and a pretreated material is formed; feeding the pretreated material into a first-stage fluidized bed, and carbonizing the pretreated product in a nitrogen atmosphere to obtain a carbonized product; feeding the carbonized product into a second-stage fluidized bed, introducing saturated steam and CO2 gas into the second-stage fluidized bed in stages, and activating the carbonized product to obtain an activated product; feeding the activated product into a third-stage fluidized bed, introducing methane gas into the third-stage fluidized bed in an inert gas atmosphere, and performing micropore surface modification on the activated product to obtain a modified product; and washing the modified product with a hydrochloric acid solution and deionized water in sequence, and carrying out vacuum drying to obtain a porous carbon product. According to the preparation method of the porous carbon, the micropore development efficiency is improved, and continuous production of the porous carbon with high specific surface area and high micropore proportion is realized.

The invention discloses an environment-friendly high-weather-resistance flame-retardant ABS plastic modification testing device, and relates to the technical field of flame-retardant ABS plastic modification testing, the environment-friendly high-weather-resistance flame-retardant ABS plastic modification testing device comprises a testing table and a plurality of cotton pads, one side of the testing table is fixedly connected with an igniter which is used for igniting methane gas and spraying flames to the lower end of a testing sample from a spraying opening in an inclined 45-degree mode, and the cotton pads are arranged on the testing table. A base plate is fixedly connected to one side of the test table, a methane bottle containing methane gas is fixedly connected to one side of the base plate, the output end of the methane bottle is connected with an input end pipeline of an igniter, and a push plate and a sliding plate are driven to move through stretching and retracting of a hydraulic cylinder, so that before the push plate pushes a cotton cushion, the cotton cushion is pushed by the sliding plate; when the cotton cushions are pushed by the pushing plate, the multiple cotton cushions above the pushed cotton cushion are supported, so that the phenomena that when the cotton cushions are pushed by the pushing plate, the multiple cotton cushions above apply pressure to the lowest cotton cushion, and the lowest cotton cushion twists and deforms in the pushing process are effectively prevented, and the effect of stably conveying the cotton cushions is achieved.

The invention discloses a high-precision laser methane concentration measurement method, which comprises the following steps: S1, acquiring detection values: continuously penetrating a plurality of lasers with different wavelengths through methane gas in a preset time period, and receiving through a photoelectric receiver to obtain a plurality of groups of detection values, each group of detection values corresponding to the laser with one wavelength; s2, array acquisition: sampling the detection value according to a predetermined sampling frequency, and digitizing the detection value to obtain a plurality of arrays; s3, data cleaning: removing deviating data in each array to obtain a cleaned array; s4, array screening: calculating the numerical value intensity of the cleaned array; and S5, determining the methane concentration: comparing the array with the maximum numerical value intensity with the methane concentration reference table to obtain a methane concentration value. According to the invention, measurement errors caused by interference and the like can be effectively eliminated, and the measurement precision is improved.

The invention relates to a vertical graphene heterojunction and a preparation method thereof, a photoelectric detector and a use method and application thereof, and the method comprises the steps: placing a substrate in a quartz tube, and then carrying out the vacuum pumping; introducing protective gas into the quartz tube and heating the quartz tube to a set temperature; closing the protective gas and vacuumizing again; the method comprises the following steps: firstly, introducing methane into an ethanol solution, and then introducing methane gas containing ethanol steam into a quartz tube so as to grow upright graphene on the surface of a substrate.

The invention provides a methane gas concentration real-time online monitoring and early warning device, method, system and medium, the method comprises the following steps: acquiring environmental data, the environmental data comprising a methane concentration apparent value and other sensor data; performing data conversion on the methane concentration apparent value to obtain a methane concentration true value; inputting a methane concentration true value and other sensor data into the trained prediction model for prediction to obtain a prediction result; and performing threshold judgment based on the prediction result to output an early warning signal, wherein the early warning signal comprises a first-level early warning, a second-level early warning and a third-level early warning. The real value of the methane concentration is determined through the conversion coefficient, the abnormal change of the methane concentration can be effectively sensed in advance in combination with the prediction model, the accuracy and timeliness of early warning are improved, meanwhile, the real-time online monitoring and early warning equipment has the characteristics of high protection, high sensitivity, low energy consumption and the like, and the method is suitable for large-scale municipal drainage pipeline network deployment. And municipal public safety is guaranteed.

The invention discloses a supporting force detection device for a hydraulic support, and relates to the technical field of supporting force detection devices.The supporting force detection device comprises a detection mechanism, an auxiliary mechanism is arranged on the detection mechanism, and the auxiliary mechanism comprises a storage box, a double-groove column, a set of rectangular pipes, a set of servo motors and a porous plug; a rotating rod movably penetrates through the surface of each belt plate support, the outer surface of each rotating rod is fixedly sleeved with a partition plate, a first discharging hole and a first feeding hole are formed in the inner wall of each groove of the double-groove column in advance, and a second discharging hole and a second feeding hole are formed in the inner wall of each circular ring block in advance. By arranging the auxiliary mechanism, the adsorbent particles can be automatically replaced, so that workers do not need to frequently replace the adsorbent particles or forget to replace the adsorbent particles, methane gas is prevented from entering the detection device, the explosion risk is reduced, and the use efficiency of the supporting force detection device is improved.

The invention belongs to the field of coal mine gas emission detection, and particularly discloses a coal mine carbon emission accurate sensing device and method. The device comprises a wind speed sensing unit, a gas concentration sensing unit and a temperature, humidity and pressure sensing unit, and acquisition ends of the sensing units are arranged at fixed points reserved in the fan drift and are respectively used for measuring discharge wind speed, gas concentration and temperature, humidity and pressure information in the mine fan drift. The gas concentration sensing unit comprises a carbon monoxide gas concentration sensing unit, a carbon dioxide gas concentration sensing unit and a methane gas concentration sensing unit, and the carbon monoxide gas concentration sensing unit, the carbon dioxide gas concentration sensing unit and the methane gas concentration sensing unit are respectively used for measuring concentration information of gases such as carbon monoxide, carbon dioxide and methane. Furthermore, the purpose of accurately measuring the emission of various carbon gases can be achieved by matching with the concentration information of the carbon emission gases measured by various gas concentration sensing units.

According to the quantitative evaluation method for the dynamic output of the adsorbed gas and the free gas of the deep coal bed gas, the gas released by the coal bed rock core sample in the experiment process and the corresponding rock core experiment data are firstly obtained, and a basic data source fitting the actual reservoir characteristics of the deep coal bed is provided for subsequent evaluation. Then isotope value testing is conducted on the gas, a first methane carbon isotope value is obtained, and the fractionation characteristics of the methane gas in matrix holes and cracks are accurately reflected. First gas pressure and first core temperature of the coal bed gas in the matrix hole are calculated, second gas pressure and second core temperature of the coal bed gas in the fracture are obtained through calculation, and accurate characterization of the temperature and pressure field in the reservoir is achieved. Finally, the gas quantity of the adsorbed gas and the free gas of the coal bed gas is obtained through calculation by means of the gas state equation and the isothermal adsorption equation, and the accuracy of quantitative evaluation of the output of the adsorbed gas and the free gas of the coal bed gas is greatly improved through multi-source fitting of simulation experiment data and preset control equation calculation data.

To provide: a methane production device and a methane production method which, in production of methane gas by bio-methanation, enable supply of the methane gas at a proper concentration required on a use place where the methane gas is used; and a power generation system utilizing the methane production device.SOLUTION: A methane production method according to the present invention, which is for performing methane production based on bio-methanation, includes: a reaction step of performing a methanation reaction with hydrogen gas and biogas being supplied; and a control step of controlling the efficiency of the methanation reaction to obtain methane gas having any methane concentration. According to the methane production method, the methane gas can be supplied at a proper concentration adapted to a use place of the methane gas. A power generation system according to the present invention utilizes the methane gas obtained from a methane production device according to the present invention. The power generation system enables the methane production device to have a high efficiency without replacing an existing gas power generator.SELECTED DRAWING: Figure 1

The invention discloses a laser cladding high-entropy alloy carbide ceramic coating and a preparation method thereof, and belongs to the technical field of high-entropy alloy coatings. A laser cladding technology is adopted, a matrix and high-entropy alloy-phenolic resin composite powder are subjected to in-situ melting through a high-energy laser beam, firm metallurgical bonding between the coating and the matrix is achieved, elements at an interface are in gradient transition, and the shear strength exceeds 100 MPa. The single-layer deposition thickness can reach more than 500 microns and can reach the centimeter level through multi-layer accumulation, so that the coating thickness capability is remarkably improved; the prepared coating is high in compactness, the porosity is lower than 5%, and the key technical contradiction that the thickness and the compactness cannot be synergistically optimized in traditional thermal spraying is effectively solved. Besides, the in-situ carbonization reaction under the methane atmosphere is innovatively adopted, the complex high-temperature synthesis process of traditional high-entropy carbide powder is avoided, the preparation cost is greatly reduced, the preparation period is greatly shortened, and the method has the remarkable advantages of being efficient, low in cost and high in performance.

The invention belongs to the technical field of methane monitoring, and particularly relates to a methane gas concentration monitoring device which comprises a pair of mounting frames, a storage box is fixedly connected to the top ends of the mounting frames, an inflation pump is fixedly connected to the top end of the storage box, the input end of the inflation pump is communicated with the storage box, and the output end of the inflation pump is fixedly connected with a first electromagnetic valve. The output end of the first electromagnetic valve communicates with and is fixedly connected with an inflation pipe, and a positioning plate is arranged above the mounting frame. According to the methane gas concentration monitoring device, during detection, the detection head moves to be attached to the annular circumferential surfaces of the flanges, the corrugated pipe sprays out clean air through the detection head, so that air in the area between the pair of flanges is intermittently clean, and when methane gas leaks at the joint of the pipelines, the detection head is moved to be attached to the annular circumferential surfaces of the flanges. Methane gas can quickly escape to an area between the pair of flanges, and then an early warning signal is sent out; meanwhile, interference of water vapor and impurity particles in air on detection laser is avoided, the detection precision is improved, and the detection effect is ensured.

The invention belongs to the technical field of metallurgy, and relates to a complex gold concentrate multi-element comprehensive recovery method which comprises the following steps: S1, complex gold concentrate and auxiliary materials are subjected to bottom blowing smelting in an oxygen-enriched air atmosphere to obtain matte, bottom slag and flue gas; s2, copper matte and auxiliary materials are subjected to top-blowing converting in the air atmosphere, and crude copper, flue gas and converting slag are obtained; and S3, the crude copper and carbonate are refined in the air atmosphere, after refining is finished, sulfur hexafluoride gas is introduced for a reaction in the air atmosphere, methane gas is introduced for reduction in the inert atmosphere after the reaction is finished, and the copper anode plate is obtained. According to the method, arsenic, antimony and bismuth in the crude copper are removed through two-step oxidation and impurity removal, and the phenomenon that arsenic, antimony and bismuth elements in the complex gold concentrate are enriched in the copper anode plate along with smelting and refining, and consequently the copper anode plate is passivated in the subsequent electrolysis process is avoided; and the recovery method is simple in process and high in recovery rate.

Suppressing methane gas emissions from paddy rice cultivation is extremely important as a measure against global warming. The challenge here is to achieve both improved rice productivity and environmental protection. Specifically, this involves developing a device that can generate large quantities of high-concentration ultrafine bubble (UFB) water in a short time, by adding methane gas emission suppression to the UFB water. [Solution] The UFB generating apparatus of the present invention incorporates a variable-speed rotary stirring device into a UFB generation tank, and this tank is filled with sandy material. By supplying gas and water to this tank at high pressure, the sandy material layer of gas, water, and sandy material is liquefied. By rapidly rotating this liquefied layer with the rotary stirring device, the gas is confined in the pore water of the liquefied layer and then finely fragmented. Furthermore, by using sandy steel slag as the sandy material, in addition to the UFB effect, methane generation due to silica, lime, and iron oxide is suppressed and crop yields are improved.

The invention provides a wide dynamic range methane detection system based on synchronous accumulation and system reconstruction. The device is characterized by comprising a modulated laser (1), a gas absorption cell (2), a photoelectric detector (APD) (3), a variable gain trans-impedance amplifier (TIA) (4) based on a digital potentiometer, a dual-threshold voltage comparator circuit (5) and a microcontroller processing unit (6). The device can be used for large-dynamic-range real-time monitoring of the methane gas concentration, and the problem that a traditional TDLAS system is prone to saturation or limited in detection limit when the concentration span is large is effectively solved. The method can be widely applied to the fields of gas concentration detection, industrial safety control and the like.

The invention provides a blowout control method based on wellhead methane adsorption, which comprises the following steps of: compounding a methane adsorption material with other necessary drilling fluid additives to form high-density composite well killing fluid in a key stage (namely when well control dangerous conditions such as overflow or well kick occur) before blowout; and then, at the position 100-200 m below a well mouth, the composite well killing fluid is injected into a shaft through special well killing fluid injection equipment according to preset injection parameters. According to the method, slipping and rising of methane bubbles invading a shaft are effectively restrained through the high density of well killing fluid, meanwhile, methane gas in the shaft is adsorbed in real time through a methane adsorption material compounded in the well killing fluid, gas column expansion and pressure rising are effectively controlled in the early stage of gas invasion through the dual-action mechanism of density suppression and active adsorption, and the gas invasion safety is effectively improved. Therefore, blowout is prevented or development of blowout is restrained.

The invention relates to the technical field of mining robot mechanical arms, in particular to a mining positive-pressure anti-explosion cooperative mechanical arm and a gas control system and method thereof. The mining positive-pressure anti-explosion cooperative mechanical arm gas control system comprises a gas source processing unit and a gas storage unit, gas is directly taken from a mine laneway environment through a gas pump, the concentration of methane in the gas is detected in real time through a methane gas sensor in a buffer cavity, and a circulating purification and waste discharge path is formed through an electromagnetic valve set; and it is ensured that only qualified gas is stored in the gas storage cavity. The whole machine adopts the vertical layout of the air cavity, the equipment cavity and the mechanical arm body, and the structure is compact; the control method comprises the steps of gas purification, purging, positive pressure maintaining and the like, and through multi-stage pressure sensing and closed-loop control, the stable positive pressure, 50 Pa higher than the ambient atmospheric pressure, in the equipment cavity is dynamically maintained. According to the invention, gas source self-supply in an underground explosive environment of a coal mine is realized, and the device has the advantages of high load self-weight ratio, small transformation degree and reliable operation.

To provide a combustion system capable of suppressing emission of greenhouse effect gas caused by mixed combustion of combustion supporting fuel with mixed gas containing inert gas and hydrocarbon gas while suppressing atmospheric emission of hydrocarbon gas.SOLUTION: A combustion system 1 includes: a membrane separation device 3 that generates process gas Gp obtained by separating at least part of nitrogen gas Gn from mixed gas Gm by using a separation membrane; a boiler 19 capable of burning at least any of methane gas Gh, the mixed gas Gm and the process gas Gp; and a mixed gas control section 6 that controls supply of the mixed gas Gm to the membrane separation device 3. When inert gas ratio determination means 9 determines a ratio is larger than a first threshold value, the mixed gas control section 6 supplies the mixed gas Gm from a mixed gas line 2 to the membrane separation device 3.SELECTED DRAWING: Figure 1

The invention provides an anti-interference detection method and system for a methane gas sensor in a complex environment, a storage medium and a program product, and relates to the technical field of gas detection. A methane gas sensor is used for acquiring an original value of methane concentration, and a multi-wavelength spectrum analyzer is used for acquiring a mixed spectrum containing methane and interference gas information. An interference coefficient library is utilized, the interference coefficient library comprises the interference coefficient of each interference gas to the methane sensor and a standard multi-wavelength spectrum, and the interference gas with the maximum contribution can be matched and recognized according to spectral characteristics. After the concentration is determined, the interference value is obtained by multiplying the interference coefficient, the interference value is accumulated, the corresponding scaled standard multi-wavelength spectrum is subtracted from the residual spectrum to update the residual spectrum, and the interference gas influence is stripped circularly. The method does not need to depend on easily-lost filtering or adsorbing materials, the problems of cost and workload increase caused by regular replacement due to material performance reduction are avoided, meanwhile, complex environment interference gas can be effectively dealt with, and high-precision and reliable methane concentration detection is achieved.

The invention relates to the technical field of gas detection, and discloses a methane gas leakage detection method based on multi-sensor data fusion. According to the method, an absorption intensity sequence and a wavelength drift distance are obtained through a plurality of tunable semiconductor laser absorption spectrum sensors. The method comprises the following steps: constructing a dynamic characteristic association network taking sensor positions as nodes, taking sensor data as node initial states, comparing adjacent node state vectors in a cross manner along a preset path, and calculating a similarity matrix of absorption spectral line characteristics; a sensor subset with a cooperative change pattern is identified, and a background absorption component and a potential leakage signal component are separated from the sensor subset. Performing space-time alignment and integration on the leakage signal to generate a regional fusion concentration distribution diagram, further calculating the methane concentration gradient and change rate, and judging leakage when the methane concentration gradient and change rate exceed a preset threshold value. According to the method, through dynamic network analysis and cooperative signal extraction, the accuracy and anti-interference capability of leakage detection in a complex environment are improved.