2765 results about "Volatile organic compound" patented technology

The invention discloses a pure bio-based polyhydroxyalkanoate adhesive as well as preparation and application thereof, and belongs to the technical field of degradable adhesives. According to the adhesive, polyhydroxybutyrate valerate or polyhydroxybutyrate hexanoate is used as a matrix, and the acid value reaches 2-15 mg KOH / g through molten end group activation; a reactive emulsifier with a hydrophilic-lipophilic balance value of 9-12 is introduced into a water phase, and the stable aqueous dispersion is prepared through phase inversion high-shear emulsification. The Z-average particle size of the dispersion is 0.12-0.30 [mu] m, and the content of the free surfactant is not higher than 30wt%. After the tackifying resin, the plasticizer and the vegetable wax are compounded, the bio-based carbon content of the obtained adhesive is not lower than 95%, and the volatile organic compound content is not higher than 100 mg / kg. The paper / paper heat sealing strength of the adhesive is not lower than 7.0 N / 15mm, the 180-degree peel strength is not lower than 7.5 N / 25mm, and the adhesive can pass repulping evaluation.

An IAQ sensor module includes: a sensor configured to measure an amount of an item in air, the item being one of particulate matter, volatile organic compounds, and carbon dioxide; a minimum module configured to selectively store the amount of the item as a minimum value of the amount when a mitigation device has been on for at least a predetermined period, the mitigation device being configured to decrease the amount of the item in the air when on; a storing module configured to selectively store the minimum value as an initial minimum value; an offset module configured to determine a drift offset for the sensor based on a difference between the minimum value and the initial minimum value; and an adjustment module configured to determine an adjusted amount of the item in the air at the IAQ sensor module based on the amount and the drift offset.

The present disclosure provides a carbon dioxide absorption composition, which includes a solution of an amino compound in a solvent comprising water and a glycol, as well as a method of using such composition to capture CO2. The present composition can be particularly advantageous for indoor use, with additional benefit for managing total volatile organic compounds and humidity to enhance overall indoor air quality.

Provided herein are methods and systems for diagnosing pathological conditions using machine learning and artificial intelligence models. An exemplary method can include loading an abundance matrix that represents mass spectrometry reads of a sample of a plurality of volatile organic compounds (VOCs) extracted from a biological sample. The abundance matrix can represent each of the plurality of VOCs in a mass-to-charge ratio dimension, an abundance dimension, and a retention time dimension. The method can include providing the abundance matrix to a machine-learning model. The machine- learning model can be trained on abundance matrixes of biomarkers of VOCs collected from healthy and diseased subjects. The method can include receiving, from the machine-learning model, a prediction of a state of a disease state.

The invention relates to the technical field of food detection, in particular to a food freshness detection system and method based on a gas sensor array, and the system comprises the following steps: the gas sensor array is used for detecting gas information of at least one target volatile organic compound in a target sample and converting the gas information into a target voltage signal; target processing is conducted on the target voltage signal through the signal control module to obtain a first processing signal, and finally the food freshness of the target sample is analyzed through the intelligent mode recognition display system on the basis of the first processing signal and a target principal component analysis and multi-layer sensor fusion model. And obtaining a food freshness detection result of the target sample. Therefore, the problems that the food freshness detection result is inaccurate due to the cross sensitivity of sensors in related technologies, the detection range and sensitivity of a single sensor cannot meet the detection requirements in a complex environment, and the accuracy and reliability of food freshness detection are reduced are solved.

The invention belongs to the technical field of volatile organic compound treatment, and relates to a VOCs catalyst, in particular to a nitric acid modified red mud-based VOCs catalyst as well as a preparation method and application thereof. The method comprises the following steps: carrying out modification treatment on Bayer process red mud by using 2.5-3.5 mol / L nitric acid, uniformly mixing the modified red mud and manganese salt in a solution to obtain a modified red mud and manganese composite precursor, and calcining the precursor at 500-600 DEG C to obtain the red mud-manganese composite material. According to the invention, the Bayer process red mud is modified by nitric acid, and the modified red mud is used as a carrier to load the transition metal Mn, so that the catalytic efficiency on toluene is obviously improved, and the catalytic treatment on VOCs is expected to be realized.

The invention relates to the technical field of odor emission reduction, in particular to an odor emission reduction control system and method for livestock and poultry manure compositing. According to the system and the method, concentration changes of ammonia gas, hydrogen sulfide and volatile organic compounds and temperature and humidity data in a composting environment are accurately obtained through real-time performance and multi-parameter association of gas monitoring in the composting process; the method comprises the following steps of: calculating a diffusion path, a speed and a coverage area of gas in a compost body through finite element analysis, quantifying the distribution characteristics of gas concentration in space, optimizing the wind speed, the wind quantity and the layout of a ventilation system, and improving the ventilation efficiency. Pattern recognition is performed on compost environment gas emission data through the convolutional neural network, the turning frequency and the compost microenvironment are dynamically adjusted in combination with the gas concentration, a gas emission high-value area and a main guide source are accurately positioned, accurate control over compost fermentation odor emission is achieved, and the systematicness and refinement level of compost odor treatment is improved.

The invention discloses an environment-friendly cementing material capable of efficiently adsorbing formaldehyde and a preparation method of the environment-friendly cementing material, and relates to the technical field of formaldehyde adsorption materials, and the environment-friendly cementing material is prepared from the following raw materials in parts by weight: 30-50 parts of activated carbon powder, 10-20 parts of diatomite powder, 8-10 parts of metal organic framework powder, 12-18 parts of a natural gelatinizing agent, 1-2 parts of a plasticizer and 2-4 parts of nano titanium dioxide. The activated carbon powder has an extremely high specific surface area and can effectively adsorb formaldehyde molecules in air. The porous structure of the diatomite powder increases the adsorption capacity of the material, and improves the formaldehyde removal efficiency. The metal organic framework powder has a unique pore structure and chemical properties, and can specifically adsorb formaldehyde and other volatile organic compounds (VOCs). The environment-friendly cementing material has the advantages of being efficient in formaldehyde adsorption, environment-friendly, durable, multifunctional, easy to process, economical, practical and the like, and is an ideal indoor air purification material.

The invention discloses an OVOC source analysis method, system, medium and equipment in the atmospheric environment, and relates to the technical field of environmental protection, and the method comprises the steps: monitoring the environment, and collecting pollutant concentration data and environmental data during observation; analyzing a plurality of pollution sources of the primary emission part of the OVOC and the concentration of each compound in each pollution source by utilizing a multiple linear regression model and an atmospheric pollutant source analysis receptor model; and inputting into an atmospheric photochemical box-type model to simulate the net generation rate of each oxygen volatile organic compound. The pollution source concentration is quantitatively reduced, the pollution source concentration and other pollution source concentration data which are not reduced are respectively input into an atmospheric photochemical box-type model to simulate the net generation rate and sensitivity of each OVOC, and quantitative analysis of the secondary generation process of the oxygen-containing volatile organic compounds is realized through a relative increment reaction activity coefficient method. Weighted calculation is carried out on the proportion of a primary emission source and a secondary generation source obtained through a multi-line element regression method, and full-process OVOC source quantitative analysis in the atmospheric environment is achieved.

The invention discloses a water-based multi-layer degradable self-polishing ship antifouling coating system and a preparation method thereof, and belongs to the field of marine anticorrosion and antifouling materials. The system is composed of a zinc-rich primer, a modified epoxy intermediate paint and a functionalized finish paint. The finish paint takes polyhydroxyalkanoate as a matrix, and integrates a self-stratification modifier capable of forming a silicon-rich top layer during curing and a latent dual-curing system capable of realizing normal-temperature curing through a synergistic effect. According to the present invention, the mixing mechanism of dynamic self-polishing and static fouling release is adopted, and the innovative curing technology is combined, such that the long working life, the excellent mechanical property and the long-acting antifouling ability are achieved. The drawing adhesive force of the system is not lower than 7.9 MPa, and the environment-friendly requirements that the content of volatile organic compounds is smaller than or equal to 50 g / L, and the content of free diisocyanate monomers is smaller than or equal to 0.1 wt% are met.

The invention provides a sand and dust scene atmosphere pollution source identification method and system, computer equipment and a medium, and belongs to the field of environmental pollution analys.The method comprises the steps that the types of volatile organic compounds and the types of fine particulate matter PM2.5 in the atmosphere of a sand and dust scene to be identified in a target area are identified, and the concentration of the volatile organic compounds and the concentration of the fine particulate matter PM2.5 are measured; carrying out mineral dust proportion calculation on the types of the fine particulate matters PM2.5 and the concentration of the fine particulate matters PM2.5 to obtain a mineral dust quantification result, and determining a dust source contribution weight according to the active metal increment in the mineral dust quantification result; and performing positive matrix decomposition prediction on the types of the volatile organic compounds, the concentration of the volatile organic compounds, the types of the fine particulate matters PM2.5 and the concentration of the fine particulate matters PM2.5 based on the dust source contribution weight, and determining the pollution source contribution proportion of the atmosphere of the sand and dust scene to be identified. According to the method, the accuracy of pollution source identification is guaranteed, and a basic guarantee is provided for subsequent pollution source treatment.

The invention discloses an acrylic acid composite emulsion coating and a preparation method thereof, and relates to the technical field of novel coatings. The acrylic acid composite emulsion coating comprises the following components in parts by mass: 30-50 parts of an acrylate monomer mixture, 1-8 parts of a functional monomer, 0.5-3 parts of a protective colloid, 1.5-5 parts of an emulsifier, 0.2-1.5 parts of an initiator, 40-60 parts of deionized water and 1-3 parts of a weather-resistant agent. The coating adopts a water-based system and takes water as a dispersion medium, so that the use of an organic solvent is reduced, the emission of volatile organic compounds (VOC) is remarkably reduced, and the coating is more environment-friendly. By adding the weather-resistant agent with a specific structure, free radicals can be effectively captured, an oxidation chain reaction can be interrupted, and the weather resistance of the coating is improved through the synergistic effect of multiple mechanisms, so that the phenomena of pulverization, color fading, cracking and the like are unlikely to occur under the action of environmental factors such as ultraviolet rays, oxygen and water vapor.

The invention discloses composite conductive powder for preparing conductive silver paste and the conductive silver paste, and particularly relates to the technical field of electronic materials.The composite conductive powder is of a double-shell core-shell structure composed of a silver metal inner core, a silicon dioxide middle coating layer and a silver nanoparticle self-assembled outer layer and is subjected to ultraviolet irradiation treatment; the conductive silver paste is based on the composite conductive powder and is matched with cerium oxide modified glass powder, graphene nanosheets, thermoplastic polyurethane resin and a dibasic acid ester solvent to form a low-temperature environment-friendly formula. The volume resistivity of the conductive silver paste is as low as 1.2 * 10 <-6 > omega.cm, the curing temperature is reduced to 120 DEG C, the content of volatile organic compounds meets the environmental protection standard, meanwhile, the tensile strength is improved by 50%, the conductive silver paste can bear 500 times of bending circulation without breakage, the adhesive force reaches the level 0 of a cross-cut method, the strict requirement of a high-performance electronic device for the conductive silver paste is effectively met, and the conductive silver paste has wide application prospects.

An apparatus and method for determining the presence of a disease by analyzing a specimen by providing a vial partially containing the specimen and partially containing a headspace above the specimen, injecting an inert gas into the specimen in the vial to cause bubbling of the gas throughout at least a portion of the specimen such that the gas mixes with volatile organic compounds (VOCs) present in the specimen to create a VOC / gas mixture that is released into the headspace, collecting the VOC / gas mixture from the headspace in the vial, supplying the VOC / gas mixture to a chamber within the apparatus, causing the VOC / gas mixture to pass over a sensor array in proximity to the chamber, the sensor array generating an electrical signal as a function of VOCs detected in the VOC / gas mixture, and processing the electrical signal to determine the presence of a disease in the specimen.

The invention belongs to the technical field of asphalt pavement repairing, and particularly relates to a local repairing technology of an asphalt pavement, which comprises the following specific contents: detecting a disease range by adopting ground three-dimensional laser scanning or ground penetrating radar, determining a repairing boundary, sampling and detecting the aging degree, the moisture content and the grading type of the asphalt of the original pavement, and determining the repairing quality of the asphalt pavement. According to the method, the bonding strength of the repairing material and the asphalt layer of the original pavement is enhanced by heating and activating the interface of the original pavement and emulsifying the asphalt bonding layer, and matching the repairing material with the shrinkage coefficient of the original pavement and reinforcing and compacting the edge, so that the condition that the repaired position is cracked, loosened and damaged in a short time is avoided; warm-mixed asphalt is adopted, the heating temperature is reduced by 40-60 DEG C, cold-mixed emulsified asphalt is popularized, and the asphalt does not need to be heated, so that release of a large amount of volatile organic compounds (VOCs), polycyclic aromatic hydrocarbons (PAHs) and dust is effectively avoided, and air pollution is avoided.

The invention discloses a combustion control method, system and device for volatile organic compounds, and relates to the technical field of thermotechnical automatic control. Acquiring the gas inlet flow rate, the gas inlet concentration and the reversing period of the catalytic combustion reactor when the volatile organic compounds are combusted in the catalytic combustion reactor; inputting the gas inlet flow rate, the gas inlet concentration and the reversing period into the mechanism model to obtain an initial prediction value of the dynamic parameter of the volatile organic compound in the combustion process; analyzing the air inlet flow velocity, the air inlet concentration and the reversing period through an error compensation model to obtain a prediction deviation value of the dynamic parameter; correcting the initial prediction value through the prediction deviation value to obtain a prediction value of the dynamic parameter of the volatile organic compound in the combustion process; when the predicted value of the dynamic parameter does not meet the preset condition, generating a control signal; the control signal is used to adjust the state of the catalytic combustion reactor. The method can accurately control the catalytic combustion process of the volatile organic compounds.

The invention relates to the technical field of detection equipment, and provides a soil volatile organic compound measuring device and method.The device comprises a pipeline, the pipeline is used for being inserted into soil, a sealable sealing section is formed at the bottom of the pipeline, a side air hole is formed in the side face of the sealing section and covered with a filter screen, and a cover capable of being opened outwards is arranged outside the side air hole; a heating piece is arranged on the cover body; the drill bit is arranged at the lower part of the sealing section; the air pressure control assembly comprises a circulating air pipeline and an air compressor, and the two ends of the circulating air pipeline communicate with the sealing section and the air compressor correspondingly; and the gas collecting bin is communicated with the air compressor. For volatile organic compounds which are low in content or difficult to diffuse in the soil, volatilization of the VOCs is promoted by heating, and then gas containing the VOCs is pumped out, so that whether organic pollutants exist in the soil or not is determined. By changing the insertion position and depth of the device in the soil for multiple times, the spatial distribution condition of VOCs in the polluted site can be quickly judged.

The invention discloses an industrial park VOCs pollution monitoring system and method, and relates to the technical field of industrial park VOCs pollution monitoring, the system comprises a multi-source data acquisition and fusion module, a non-point source-point source conversion module, a micro-scale CALPUFF modeling module, a pollution traceability inversion module and a traceability result verification module; by collecting cleaning data, a non-point source is discretized into a virtual point source, a CALPUFF model is constructed to simulate diffusion, and a pollution source is inverted and verified. According to the method, high-temporal-spatial-resolution pollution monitoring with 500m * 500m grid precision is realized, the traceability precision is improved, the problem of distortion of traditional non-point source processing is solved, the method adapts to complex terrains and dynamic meteorological conditions, and a precise decision basis is provided for park pollution management and control.

The invention provides an environmental health risk judgment method based on an emission list dynamic management system, and the method comprises the following steps: S1, analyzing the pollution source emission characteristics of a target region, and building a region key risk source emission information base according to an emission list; s2, calculating the discharge amount of the key risk source specific pollutants; s3, simulating the regional characteristic pollutant exposure concentration by using an atmospheric diffusion model CALPUFF; s4, risk source grading judgment and regional atmospheric environment health risk grading judgment. According to the invention, necessary information for judging the environmental health risk is obtained based on the dynamic emission list database of the atmospheric pollution source, so that integration of management and control services of the atmospheric pollution source and the ecological environmental health risk can be realized; the method has very strong support to environmental health risk whole-process prevention and control policy guidance of heavy metals, volatile organic compounds, new pollutants and other toxic and harmful chemical substances.

The invention discloses a system and a method for monitoring olfactory smell in a pension community based on Internet of Things, and relates to the technical field of pension, a TVOC sensor and an ammonia gas sensor are adopted to capture volatile organic compounds released by sweat in real time, and temperature, humidity and air fluidity data are combined to calculate a dynamic air quality index, so that the olfactory smell in the pension community is monitored. The defect that a traditional method only depends on temperature and humidity or CO2 concentration monitoring is overcome; secondly, in the air quality state analysis process, AI analysis is adopted for sweat and odor concentration prediction and pollution trend modeling, a long-short-term memory network LSTM is introduced for time sequence analysis, in combination with air quality change rate and humidity anomaly detection, it is guaranteed that air pollution can be timely and early recognized and predicted, and the problem of monitoring blind areas is avoided; and in the aspect of air optimization regulation and control, the air volume and the purification intensity of the air purification equipment are dynamically adjusted through ventilation control in combination with an air quality optimization instruction and an old people fitness activity mode.

The invention discloses a method for reducing the odor grade of a polyolefin resin material by utilizing supercritical extraction, which mainly adopts a supercritical CO2 extraction technology and takes an ethanol solution containing a Chinese honeylocust fruit extract as a carrying agent to realize removal of odor small molecular substances in the polyolefin resin material so as to realize preparation of low-odor and low-VOC (Volatile Organic Compounds) polyolefin. The method does not need post-processing, can be used for refining and purifying various polyolefin finished product raw materials, and has high popularization value.

The invention relates to the field of automobile roofs, and particularly discloses a low-odor dry ceiling and a manufacturing method thereof. The invention discloses a low-odor dry ceiling and a manufacturing method thereof. The low-odor dry ceiling comprises a non-woven fabric, a first chopped glass fiber layer, a first adsorption bonding layer, a first hot melt adhesive film layer, a polyurethane foam layer, a second chopped glass fiber layer, a second adsorption bonding layer, a second hot melt adhesive film layer and a fabric layer which are sequentially connected, each of the first adsorption bonding layer and the second adsorption bonding layer comprises high-density polyethylene powder and an adsorbent, the addition amount of the adsorbent is 15-25wt% of that of the high-density polyethylene powder, the adsorbent is silicon dioxide aerogel modified composite activated carbon, and the composite activated carbon comprises microporous activated carbon and mesoporous activated carbon in a mass ratio of (2.56-3.12): (1.12-2.05); in addition, the preparation method disclosed by the invention has the advantage of reducing odor and VOC (Volatile Organic Compounds) in the production and use processes of the automobile roof.

The invention discloses low-VOC (volatile organic compound) environment-friendly end-capped mercapto silane as well as a preparation method and application thereof.The preparation method comprises the following steps: by taking chloroalkyl trialkoxysilane and linear alkyl polyether alcohol as raw materials, reacting to form an intermediate c; reacting alkyl acyl chloride with sodium sulfide or sodium hydrosulfide to form an intermediate e; and reacting the intermediate c with the intermediate e to obtain a final product. Silane is used as a rubber auxiliary agent, so that the volatilization amount of alcohols in the internal mixing process of a rubber compound can be greatly reduced, the emission amount of VOC during operation is reduced, meanwhile, the vulcanization performance of a rubber material can be improved, the scorching time of the rubber material can be prolonged, the reinforcing effect of vulcanized rubber can be improved, the physical and mechanical properties of the vulcanized rubber can be improved, and the wet skid resistance of tread rubber can be improved; therefore, the environment-friendly rubber auxiliary agent is a multifunctional environment-friendly rubber auxiliary agent.

The invention belongs to the technical field of organic waste gas treatment, and particularly relates to a VOCs (volatile organic compounds) treatment device which comprises an upper box filled with cooling liquid; the lower box body is arranged at the bottom end of the upper box body; the air inlet spinning cooling mechanism is arranged in the upper box body, the air inlet end of the air inlet spinning cooling mechanism is located at the top end of the exterior of the upper box body, the air outlet end of the air inlet spinning cooling mechanism is located in the lower box body, the dust removal adsorption mechanism is detachably arranged on the upper portion of the interior of the lower box body, and the dust removal adsorption mechanism is located below the air outlet end of the air inlet spinning cooling mechanism. The dust removal and adsorption mechanism is used for filtering and adsorbing the cooled VOCs gas; the rotary spraying mechanism is fixedly arranged at the lower part in the lower box body, and the rotary spraying mechanism is used for spraying the filtered and adsorbed VOCs gas; and the exhaust pipe is fixedly communicated with the side wall of the lower box body. The treatment effect of the VOCs can be improved.

The invention provides a VOCs catalyst as well as a preparation method and application thereof, and belongs to the field of atmosphere prevention and control. The invention provides a VOCs (Volatile Organic Compounds) catalyst. The VOCs catalyst comprises a modified ZSM-5 zeolite molecular sieve and active metal and / or oxide of the active metal loaded on the modified ZSM-5 zeolite molecular sieve, the preparation method of the modified ZSM-5 zeolite molecular sieve comprises the following steps: mixing a ZSM-5 zeolite molecular sieve and an organic alkali solution, and carrying out a hydrothermal reaction to obtain an organic alkali-loaded ZSM-5 zeolite molecular sieve; and roasting the ZSM-5 zeolite molecular sieve loaded with the organic alkali, and removing the organic alkali to obtain the modified ZSM-5 zeolite molecular sieve, the organic alkali solution is a tetrapropylammonium hydroxide solution.

An EFEM air conditioning system using a VOC filter and a desiccant comprises: an EFEM including a transfer chamber which is a space in which an object to be processed is transferred to a process module; a VOC filter system for filtering volatile organic compounds in air that is supplied to the transfer chamber; and a desiccant system for adjusting the humidity of the transfer chamber, wherein the VOC filter system comprises a filter body including a VOC filter for filtering the volatile organic compounds contained in the air that is supplied to the transfer chamber, and the desiccant system comprises a desiccant rotor including an adsorbent for adsorbing moisture in the air that is supplied to the transfer chamber, and a dehumidified air supply line for supplying dehumidified air, discharged from the desiccant rotor, to the transfer chamber.

The invention provides a system and method for improving the ability of activated carbon to adsorb medium and low temperature VOCs waste gas, and the system comprises: a heat exchanger for introducing steam heat of the medium and low temperature VOCs waste gas to perform waste heat recovery to generate high temperature circulating water; the refrigerating system is used for receiving the high-temperature circulating water through a pipeline and recovering heat of the high-temperature circulating water to enable the refrigerating system to generate a refrigerant, and the refrigerant enters the heat exchanger to exchange heat with the medium-low-temperature VOCs waste gas; the activated carbon fixed bed adsorption device is used for receiving the medium and low temperature VOCs waste gas after heat exchange and adsorbing organic gas in the waste gas; the steam thermal desorption device is used for introducing steam into the activated carbon fixed bed adsorption device for desorption after the activated carbon fixed bed adsorption device is saturated in adsorption, and the steam takes away the organic gas adsorbed by the activated carbon fixed bed adsorption device and enters a downstream phase change heat exchanger; and the phase change heat exchanger is used for recycling steam heat after analysis by using circulating water to generate high-temperature circulating water, and after heat is recycled, waste gas is condensed, so that organic gas is dissolved in water to form an organic solvent to be recycled.

The invention discloses an on-line detection method for volatile organic compounds in waste gas, and belongs to the field of waste gas emission monitoring, the detection method comprises the following specific steps: I, starting a quantum cascade laser frequency comb of a middle infrared band, calibrating various parameters of the quantum cascade laser frequency comb, and ensuring to cover a characteristic absorption area of the volatile organic compounds in the waste gas; iI, inputting the waste gas into a gas detection chamber through a sampling pipeline, monitoring the state of the waste gas in real time, and dynamically adjusting the conditions of the gas detection chamber according to various collected signals; the device can capture instantaneous fluctuation of waste gas concentration in real time, meets the high-speed dynamic emission monitoring requirement, has extremely high coherence and narrow linewidth, can analyze tiny spectral line differences which cannot be distinguished by a traditional spectrograph, remarkably improves the detection precision and the recognition capability, ensures that a measurement result still keeps consistency and high reliability under different working conditions, and is suitable for large-scale popularization and application. The signal-to-noise ratio is obviously improved, the power drift is reduced, and long-time stable operation is realized.

The invention discloses a preparation method of a low-temperature high-air-velocity VOC (volatile organic compound) catalyst and the catalyst, belongs to the field of industrial waste gas treatment, and aims to solve the problems that volatile organic compounds VOCs as main atmospheric pollutants cause photochemical smoke and harm human health; a VOCs catalyst in the prior art cannot meet catalytic combustion treatment process conditions at a high space velocity of 30000 h <-1 >. The high airspeed VOCs noble metal catalyst is developed aiming at a complex volatile organic compound VOCs catalytic combustion technology and meets industrial requirements, and the maximum airspeed of the catalyst is 30000 h <-1 >. The catalyst is an integral honeycomb catalyst formed by taking a double-effect synergistic two-component noble metal precursor, a transition metal oxide and a rare earth oxide as active components, so that the oxygen vacancy of a carrier and the acidity of a catalyst Bronsted acid are enhanced, and the capabilities of oxygen vacancy flow on the surface of the catalyst and adsorption and oxidative dissociation of functional groups on the surface of VOCs (Volatile Organic Compounds) are enhanced.

The invention relates to an engine stator part small target crack length measurement method based on a deep convolutional neural network, and the method comprises the steps: carrying out the labeling of an initial fatigue crack image obtained through carrying out a fatigue crack propagation experiment, converting the initial fatigue crack image into a PNG label, and carrying out the expansion of the original image and the label through a data intensifier, constructing a VOC (volatile organic compound) format small target crack data set; with the help of the strong feature extraction capability and fine distinguishing capability of a deep convolutional neural network, a semantic segmentation network for small target crack segmentation is constructed based on a full convolutional network, a U-shaped architecture and jump connection, and training is performed to obtain a trained model weight for high-quality crack segmentation; and based on the segmented image, extracting a crack skeleton with a pixel width by adopting preprocessing means such as expansion and a refinement algorithm, counting the number of pixel points in different arrangement modes based on the crack skeleton, calculating to obtain a crack pixel length, and performing scale conversion to obtain an actual crack length. According to the invention, high-precision measurement of the crack length of a large batch of small targets is realized.