903 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 discloses a thin mutual coal seam fracturing, gasification and carbon sequestration integrated method. The method comprises the steps of geological exploration and coal seam refined evaluation; a middle horizontal well is drilled downwards from the ground; top and bottom horizontal wells are planned and drilled in the uppermost and lower sandstone stratums of the thin mutual coal seam; a plurality of top and bottom fishbone wells are drilled obliquely downwards and upwards in the top and bottom horizontal wells; oxygen-enriched water vapor is injected into the middle horizontal well through a continuous oil pipe, the oxygen-enriched water vapor is squeezed into the reservoir under the action of high pressure, and fracturing operation is conducted; initiating an underground gasification process of the coal seam, and synchronously performing extraction operation of the coal seam gas; supercritical CO2 fracturing operation is conducted on the top horizontal well and the bottom horizontal well; injecting water-based fracturing fluid into the top horizontal well and the bottom horizontal well; gasified materials generated by coal seam combustion gasification and desorbed methane gas are extracted through the middle horizontal well, and supercritical carbon dioxide injected before is sealed for a long time. According to the method, the limitation of a traditional hydraulic fracturing technology can be solved, and the transformation effect of the reservoir can be improved.

The invention relates to a method and a system for detecting the concentration of trace methane by locking the position of an absorption peak, and belongs to the technical field of laser gas detection. Modulated laser output by a laser is divided into two paths, one path enters a reference light path, the other path firstly passes through a gas absorption cell and then enters an actual detection light path, and methane gas with known concentration is sealed in the reference light path; demodulating a modulation signal output by the actual detection light path, and calculating to obtain a trace methane gas concentration value; and demodulating the modulation signal output by the reference light path to obtain a second harmonic signal, comparing the amplitude of the second harmonic signal with the amplitude of a harmonic signal corresponding to a preset methane absorption peak to generate a wavelength shift error signal, and adjusting the driving parameter of the laser through a feedback mechanism to generate a wavelength shift error signal. The output power and wavelength drift of the laser are monitored in real time, and it is ensured that the laser wavelength is always locked within the methane absorption peak range. According to the invention, high-precision and high-stability trace methane concentration detection can be realized.

The invention belongs to the technical field of gas concentration detection, and discloses a three-dimensional tomography method and system for gas concentration space distribution detection based on an unmanned aerial vehicle, and the method comprises the steps: 1, building a space rectangular coordinate system, and converting latitude and longitude coordinates into XYZ coordinates; 2, dividing view field grids and grid numbers; 3, calculating the number of intersecting grids of the light beams and the view field and the length of intersecting line segments; 4, calculating a weight coefficient matrix and an integral concentration vector; and 5, reconstructing gas three-dimensional concentration distribution by using an SART algorithm. The system combines the unmanned aerial vehicle and the telemetry technology, realizes gas cloud scanning and three-dimensional gas cloud concentration distribution reconstruction based on the unmanned aerial vehicle, has the characteristics of non-contact measurement, high imaging speed, high precision, autonomous detection, strong environmental adaptability and the like, can monitor and predict the gas diffusion trend in real time, and has a wide application prospect. And a new solution is provided for realizing accurate traceability of methane gas leakage and reconstruction of leakage space distribution in a complex scene.

An indoor fire hazard flashover risk prediction method based on a flame form and remote sensing data comprises the following steps: using fire hazard simulation software to simulate fire hazard data, and constructing a fire hazard data set; ignition is conducted, an indoor fire flame image is obtained through a high-definition camera, and the obtained image is processed; outputting the real-time heat release rate HRR of a fire point from the processed image through a residual network Resnet model; a methane laser remote sensing detector is used for monitoring and acquiring methane gas concentration data of an indoor flue gas layer at a specific height in real time; and building a fire hazard flashover risk prediction model based on the fire source heat release rate and the methane gas concentration, and predicting the flashover risk in advance. According to the invention, accurate identification and prediction of the flashover risk of the fire in the early stage of fire development are realized, and an early warning signal is sent when the fire is about to enter the flashover stage, so that casualties and property loss caused by the fire are reduced.

The invention provides a methane concentration prediction method and system based on a neural network hybrid model, and belongs to the technical field of methane gas concentration prediction.The method comprises the steps that the methane concentration in the environment is obtained; the concentration of methane in the environment is treated, and a ring-down time factor is obtained; calculating a first methane concentration based on the ring-down time factor; integrating the first methane concentration with detection time, environment temperature and humidity to construct a first data set; constructing a neural network hybrid model for predicting the long-term methane concentration; and analyzing the first data set based on the hybrid prediction model, and predicting the long-term methane concentration. Complex spatial features and long-range time dependence in data are effectively mined through deep fusion of three network models, and the methane concentration prediction method with high precision and high reliability is provided.

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 relates to the technical field of methane cracking and hydrogen production, and discloses a metal-modified Co-Bi liquid alloy catalyst, wherein the catalyst uses Co as an active component, uses Bi low melting point metal as a solvent, and uses a third metal M as an auxiliary agent; the invention also discloses a method for preparing the catalyst, comprising: calcining a cobalt salt to generate cobalt oxide, and then forming CoO-MO X The mixture powder was finally heated under N2 and H2 atmosphere to obtain CoO‑MO X The powder is mixed with elemental Bi to obtain a cobalt-bismuth ternary liquid alloy catalyst; the present invention also discloses a method for applying the catalyst to methane cracking and hydrogen production, comprising: heating the preheating furnace to a certain temperature, introducing pure methane gas, and reacting under normal pressure, at a temperature of 500 to 700°C, with a methane space velocity of 1 to 100 mL / g·min, and after the reaction is completed, the temperature drops to room temperature in an N2 atmosphere, and the carbon product is taken out of the reaction tube after cooling. The catalyst disclosed by the present invention has the advantages of high activity, good stability, strong methane cracking ability, mild reaction conditions, simple preparation process, and long life.

The invention provides a methane recovery and purification system in intelligent cleaning equipment, which relates to the technical field of environmental protection, and is characterized in that methane-containing gas is collected from the cleaning equipment, moisture and small particles in the gas are removed to obtain preliminarily purified gas, and then methane is separated and recovered by using a separation technology to obtain purified gas. And the purified methanol is obtained through multi-stage purification treatment. According to the methane recovery technology, a time sequence of gas components, a time sequence of physical properties and a time sequence of process parameters need to be obtained, and local time sequence coding and causal context time sequence aggregation are carried out, so that a separation technology recommendation result is recommended, and operation parameters are dynamically adjusted. Therefore, subjective experience can be abandoned, gas characteristics and process requirements are monitored in real time and accurately matched, the accuracy and objectivity of separation technology selection are improved, and it is ensured that the separation process is always in the optimal state.

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 provides a method for resourceful treatment of blue-green algae and reed straws, which comprises the following steps: (1) mixing dehydrated blue-green algae, crushed reed straws and water to obtain a mixture to be fermented; (2) introducing the to-be-fermented mixed material into an acidification hydrolysis fermentation tank, adding a first bacterial liquid, introducing protective gas, and carrying out acidification hydrolysis fermentation in a closed environment to obtain a fermented mixed material; (3) when the pH value and the acetic acid volume content of the fermented mixture reach target values, releasing the closed environment, and performing solid-liquid separation to obtain biogas slurry and biogas residues; (4) introducing the biogas slurry into an anaerobic methanogenesis fermentation tank, adding a second bacterial liquid, introducing protective gas for anaerobic methanogenesis fermentation, and collecting produced methane gas; and (5) introducing the biogas residue into an aerobic fermentation tank, adding an aerobic fermentation bacterial liquid, carrying out aerobic fermentation, and collecting the produced finished product organic fertilizer. According to the method provided by the invention, efficient reutilization of the blue-green algae and the reed straws is realized, the treatment efficiency and the gas production rate are improved, and large-scale popularization and application are facilitated.

The invention relates to the technical field of comprehensive recognition and evaluation of pavement collapse risks, in particular to a comprehensive recognition and evaluation method for the risk of pavement collapse induced by methane shallow gas leakage. A fault tree and a T-S fuzzy number concept are introduced to express a logical relationship between events, a shallow gas leakage caused pavement collapse fault tree is constructed, a T-S fuzzy fault tree is adopted to evaluate the sensitivity and the importance degree of each factor, and environmental information of shallow gas leakage disasters is comprehensively counted. And an accurate risk identification index and risk assessment of shallow gas leakage are summarized.

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.

The invention discloses a source community sewage pollutant deposition-washing cooperative control method and system, and the method comprises the following steps: S1, discharging domestic sewage discharged by residents from an inspection well, and recognizing a pipeline operation mode according to a community resident drainage time period inputted by a remote control center; s2, performing different drainage control according to different time periods; s3, in the operation process of the system, monitoring and early warning the sediment height and methane gas in the sediment control pool 1 in real time; and an operator on duty of the remote control center timely and accurately performs mode switching treatment in the step S2 according to early warning signals transmitted by the ultrasonic mud level meter and the infrared gas detector, or adopts related operation and maintenance strategies for dredging treatment. According to the method and the system, the operation modes of the sediment control pool and the sewage pipeline in different drainage periods are set, so that the pollutant deposition of the pipeline of the source community is reduced and the collection efficiency of the domestic sewage pollutants is improved while the initial interception and precipitation function of the septic tank is exerted.

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 methane leakage monitoring, and discloses a method and a system for estimating methane leakage flux of an ocean station movable cold spring. The method comprises the following steps: acquiring physical states of bubbles at different depths of a station cold spring area and physicochemical properties of methane gas in the different depths of the station cold spring area, and obtaining a station cold spring plume three-dimensional static molar concentration model; calculating the molar flux of methane in a bubble state and the rising speed of bubbles to obtain the eruption rate of the seabed cold spring nozzle; and calculating the annual cold spring methane leakage flux of the station by combining the station cold spring plume three-dimensional static molar concentration model, the eruption rate and the bubble rising speed with the periodic leakage characteristics of the cold spring plume. The methane flux of the station cold spring leakage is 6.44 * 10 < 5 > mol / yr, which is greater than the previous estimation result. Previously, understanding of contribution of methane leakage of a cold spring system to climate change and carbon cycle is underestimated.

The invention discloses a room-temperature methane sensor based on a Pd-doped rGO / SnO2 nano composite material and a preparation method of the room-temperature methane sensor, and belongs to the technical field of gas sensors. The Pd-doped rGO / SnO2 nano composite material is synthesized by adopting a hydrothermal method and a liquid phase reduction method, and the Pd-doped rGO / SnO2 nano composite material is dripped and cast on an Al2O3 planar ceramic chip substrate with an Au interdigital electrode. The excellent sensing performance at the room temperature is attributed to doping of rGO and Pd, and rGO plays a role of a conductive network to promote electron transfer, and in addition, the specific surface area of the material can be increased, and methane gas adsorption can be promoted; pd can activate the dissociation of oxygen molecules, so that atomic products are diffused to the surface of metal oxide, the quantity of adsorbed oxygen is increased, the molecule-ion conversion rate is improved, and the activation energy required by sensing reaction is reduced. Therefore, the Pd-doped rGO / SnO2 nano composite material is a promising sensitive material for designing and manufacturing a room-temperature methane gas sensor.

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.

The invention discloses a transformer fault detection method and device, a transformer and a storage medium. The transformer fault detection method comprises the following steps: acquiring hydrogen gas concentration, methane gas concentration, ethylene gas concentration, ethane gas concentration and acetylene gas concentration of dissolved gas in transformer oil, and determining a target transformer fault area corresponding to the dissolved gas according to the acetylene gas concentration; and determining a decision coordinate value corresponding to the dissolved gas according to the hydrogen gas concentration, the methane gas concentration, the ethylene gas concentration, the ethane gas concentration and the acetylene gas concentration, and determining a current transformer fault of the transformer according to the decision coordinate value and the target transformer fault area. According to the method, the dissolved gas in the transformer oil is effectively identified and quantified, the method is suitable for low-cost online fault detection of the transformer, and the accuracy of fault detection and identification of the transformer is improved.

The invention discloses a shale gas reservoir free gas and adsorbed gas yield testing device and method, and belongs to the technical field of shale gas reservoir development and productivity evaluation.The shale gas reservoir free gas and adsorbed gas yield testing device is characterized in that the inlet end of a shale holder is connected with the outlet end of a booster pump through a high-pressure pipeline; the inlet end of the booster pump is respectively connected with a methane gas cylinder, a helium gas cylinder and a vacuum pump through a four-way joint; the confining pressure inlet end of the core holder is connected with a confining pressure pump through a high-pressure pipeline; the outlet end of the core holder is connected with a back-pressure valve through a high-pressure pipeline, and a pressure sensor is arranged on the pipeline between the core holder and the back-pressure valve; the outlet end of the back-pressure valve is connected with a gas flowmeter; helium / methane saturation and gas production experiments are respectively carried out based on the test device, and free gas cumulative yield and adsorption gas cumulative yield are obtained according to a relation curve drawn by test data. The method can be used for quantitatively acquiring the free gas, the adsorbed gas and the cumulative yield of the shale gas reservoir, and the accuracy of a measurement result is improved.

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 relates to an explosion impact test technology, in particular to a solid / gas two-phase explosive wave driven aircraft ground test device and method, and the solid / gas two-phase explosive wave driven aircraft ground test device comprises an anti-static floor, a gas distribution system, a test system, a solid explosive fixed initiation device and a tunnel system, the tunnel system comprises a fixed support, a tunnel, a gas circulator, a first gas exchange pipeline and a second gas exchange pipeline, the gas distribution system comprises a high-pressure gas tank, a high-pressure methane gas cylinder and an air exchanger, and the test system comprises an electronic exploder, a pressure sensor and a flame sensor. Modulation of different overpressures and different durations can be carried out by controlling the solid charge amount, the gas concentration, the solid explosive charge amount, the solid explosive type and the like, the overpressure peak value and the duration of explosion shock waves are adjustable and controllable, and the requirement that external loads of an aircraft continuously change in different flight environments is met.

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 utility model discloses a laser methane gas detection device, belongs to the technical field of gas detection, and solves the problem that a laser methane sensor is easily influenced by interference factors such as water mist and greasy dirt in air to interfere gas detection. Comprising a circuit board and a laser reflecting part, the laser reflecting part is installed on the surface of the circuit board, and a laser transmitter and a laser receiver are further installed on the surface of the circuit board; a grating partition plate is arranged in the laser reflecting part, and the laser transmitter and the laser receiver are distributed on the two sides of the grating partition plate; a cavity is formed in the laser reflecting piece, and laser emitted by the laser emitter is reflected to the laser receiver through the inner wall of the laser reflecting piece and the grating partition plate; according to the utility model, greasy dirt and water vapor existing in gas to be detected are filtered through the filter screen, scattered light emitted by laser beams and part of reflected light are shielded by utilizing the grating partition plate in the laser reflecting piece, and the measurement precision and accuracy of gas detection are improved.

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 belongs to the technical field of laser spectrum, and particularly relates to a 13CH4 isotope detection device and method based on optical feedback cavity enhancement. In order to improve the concentration precision of C13 and C12 in methane gas and the measurement precision of carbon isotopes, a laser controller controls a laser device to emit light beams to pass through a polaroid, a first lens, a quarter-wave plate, a second lens and a reflector to enter an optical cavity, laser is reflected back and forth in the optical cavity, laser in four directions can be emitted, and the concentration precision of C13 and C12 in the methane gas is improved. Wherein one beam returns to the DFB laser in the same path, a signal emitted from the right end of the optical cavity is received by the photoelectric detector, and a cavity mode signal with optical feedback is seen on the oscilloscope. After an acquisition program is started, the high-voltage amplifier is controlled to adjust the PZT, the feedback phase is controlled, and the frequency of the laser is locked to the optical cavity. When the whole device operates normally, only methane gas with different concentrations needs to be replaced, and the corresponding C13 and C12 measurement precision can be obtained.