137 results about "Nitrogen dioxide" patented technology

The invention relates to the technical field of automobile air purification, and particularly discloses a filtering material, a preparation method of the filtering material and a novel automobile air conditioner multi-effect catalytic formaldehyde removal filter. The filtering material comprises a PET (Polyethylene Terephthalate) supporting layer, a gas filtering layer and a PP (Polypropylene) electrostatic filtering layer which are arranged in sequence, the gas filtering layer is prepared from the following raw materials in parts by weight: 30 to 90 parts of activated carbon and 10 to 70 parts of manganese catalyst. The gas filtering layer composed of the activated carbon and the manganese catalyst is matched with the filtering material composed of the PET supporting layer and the PP electrostatic filtering layer, four gases of n-butane, methylbenzene, sulfur dioxide and nitrogen dioxide can be adsorbed, the manganese catalyst degrades formaldehyde at normal temperature, meanwhile, the reaction on the formaldehyde is a catalytic reaction, and the environment-friendly effect is achieved. Therefore, the filter material disclosed by the invention also has longer service life, so that a filter made of the filter material has a better formaldehyde removal effect and longer service life.

The invention provides a built-in elastic connector for a cable accessory, and relates to the technical field of cable accessories. The fixing plate is of an annular plate structure. A first plug of a cylindrical structure is arranged on the inner side of the fixing plate in a sliding mode. A lower protection plate of a circular structure is fixedly arranged at the bottom of the outer side of one end of the first plug. An annular groove structure is formed in the inner side of the lower protection plate; the two sides of the bottom of the lower protection plate are each fixedly provided with a gas tank, and the gas tanks are filled with nitrogen dioxide gas. A second sliding rod of a rectangular rod structure is slidably arranged in a rectangular through groove in the inner side of the bottom of the lower protection plate. The top end of the second sliding rod is fixedly provided with a detection block of a wedge-shaped block structure, connection abnormity can be rapidly judged only through visual inspection, the timeliness and convenience of fault detection are greatly improved, the operation and maintenance cost and difficulty are reduced, the problem that connection looseness cannot be conveniently found in real time is solved, and the fault detection efficiency is improved. And the elastic force of the spring cannot be well monitored.

The utility model discloses a diesel generator flue gas purification mechanism for civil air defence engineering, including air inlet pipe and purification bin, the air inlet pipe one end is linked with diesel generator exhaust pipe in civil air defence engineering power generation room intercommunication, the other end of air inlet pipe is inserted into the purification bin and the opening direction is perpendicular to downward, the open end position of air inlet pipe in the purification bin is connected with the shunt joint, each interface of shunt joint all is connected with the jet pipe that the air hole of pipe body lateral wall is evenly set up, the utility model relates to civil air defence engineering technical field, utilize liquid supply booster pump and press into the spray subassembly in alkaline solution (15% magnesium hydroxide compound agent), and further via spray subassembly to the spray of filler layer, make the nitrogen monoxide, nitrogen dioxide, sulfur dioxide and particulate matter etc. in tail gas contact with the alkaline water mist in purification bin and filler layer, to the purification treatment of nitrogen monoxide, nitrogen dioxide, sulfur dioxide and particulate matter.

The invention belongs to the technical field of medicine synthesis, and discloses a preparation method of a sodium nitroprusside raw material medicine. According to the method, weak acid is adopted for catalysis, the effect of remarkably reducing generation of toxic substances such as cyanide and nitrogen dioxide is achieved by controlling the material dripping speed and the dripping pH, the reaction is mild, the technological operation is safe and controllable, and industrial production of the sodium nitroprusside raw material medicine is facilitated. According to the preparation method of some examples, silica gel filtration is used for post-treatment, the residual risk of impurities such as sodium ferricyanide, ferric ferrocyanide and ferric ferricyanide is reduced, and the purity of the raw material medicine is larger than or equal to 99.9% and is far superior to the requirements of pharmacopoeia of various countries.

The invention relates to a method for producing an electrochemical cell, preferably a fuel cell, in particular a PEM fuel cell, in which a catalyst material is deposited on a carbon-based support material having a porous structure in order to form an electrode of a membrane-electrode assembly and the carbon-based support material is subsequently subjected to a thermal post-treatment, the carbon-based support material is selectively oxidized by means of a reaction gas containing at least one reactant, preferably carbon dioxide (CO2), ammonia (NH3), nitrogen dioxide (NO2), nitrogen monoxide (NO) and / or water vapor (H2O). The invention also relates to an electrochemical cell, preferably a fuel cell, in particular a PEM fuel cell.

The invention belongs to the technical field of nano sensing and gas monitoring, and discloses an MXene / ZnO nano composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, etching Ti3AlC2 by using hydrochloric acid and lithium fluoride to obtain multi-layer two-dimensional MXene, and then carrying out ultrasonic stripping and freeze drying to obtain few-layer MXene; carrying out alkalization treatment on few layers of MXene, and then carrying out centrifugal cleaning to obtain 1D / 2D-MXene with a composite structure; the preparation method comprises the following steps: adding 1D / 2D-MXene and zinc acetate dihydrate into a mixed solution of water and ethanol, and carrying out a hydrothermal reaction; the preparation method comprises the following steps of: performing centrifugal cleaning and vacuum drying to obtain a multi-level 1D / 2D-MXene / 0D-ZnO nano-composite structure consisting of 0D-ZnO, 1D-MXene and 2D-MXene, and the multi-dimensional nano-composite structure is suitable for preparing a gas sensor and is used for detecting low-concentration nitrogen dioxide gas at room temperature. The nano composite material and the sensor prepared by the invention show excellent gas-sensitive performance on nitrogen dioxide gas, are high in sensitivity, can realize normal-temperature detection, and have relatively great application potential.

An engine data processor for an internal combustion engine is structured and arranged for: receiving a geometric characteristic of an exhaust unit through which the exhaust gas composition can be discharged, and determining from the geometric characteristic a smoke visibility limit value; receiving filter fill status information from an exhaust gas filter for filtering the exhaust gas composition; receiving a mean catalytic converter temperature of an exhaust gas catalytic converter for catalyzing the exhaust gas composition and determining a nitrogen dioxide conversion rate subject to the filter fill status information which has been received and the mean catalytic converter temperature; comparing the calculated nitrogen dioxide conversion rate with the smoke visibility limit value, and determining therefrom a control variable for the internal combustion engine so that the exhaust gas composition is invisible; and issuing the control variable.

The application discloses a kind of based on plant extract liquid atomization and bionic controller's waste gas purification device, it is related to waste gas purification treatment field, including plant extract liquid emitter, UV photocatalytic lamp assembly, ultrasonic generator, low-temperature plasma filter device and bionic flow control device;With plant extract liquid specific component combination UV photoelectrolytic catalytic technology, oxidation decomposition nitrogen oxide generated free radical, block free radical chain reaction to remove nitrogen dioxide, provide more depth efficient purification effect, by ultrasonic atomization technology plant extract liquid is converted into small ionic state particles, combination low-temperature plasma filter device reduces waste gas diffusion rate, greatly increase plant extract liquid and impurity and harmful tail gas contact area and reaction length, by bionic flow control device, utilize the uneven deformation characteristics caused by different thermal expansion coefficients of bimetallic strip, control switch and adjust flow size, further improve resource utilization efficiency and sustainability.

The invention relates to an austenitic stainless steel food-grade pipe welding spot cleaning passivator. The austenitic stainless steel food-grade pipe welding spot cleaning passivator comprises the following components in parts by mass: 0.2-1.2 parts of a complexing agent, 0.5-2.5 parts of a sealing agent, 9.5-18 parts of organic acid, 1-5 parts of an oxidizing agent, 1-5 parts of a coordination agent, 0.2-2 parts of a corrosion inhibitor, 0.4-1.5 parts of an active agent and 64.8-87.2 parts of water. Through compounding of the whole materials, after a stainless steel workpiece is cleaned and passivated, no heavy metal is left on the surface of the workpiece, the corrosion resistance of the surface of the workpiece can be improved, the service life of the workpiece is prolonged, harmful gas, acid mist and toxic substances are not generated in the process of cleaning and passivating the workpiece, and the service life of the workpiece is prolonged. The austenitic stainless steel cleaning and passivating agent is safe and environment-friendly to use, and solves the problems that in the process of cleaning and passivating austenitic stainless steel products by adopting a pickling and passivating method in the market, acid mist is formed, nitrogen dioxide polluting the atmosphere is generated, chromium compounds with high toxicity are generated, and the health of operators is harmed and the environment is polluted.

An internal combustion engine system is described herein. The system uses a NOx detector at the exhaust of an internal combustion engine to compensate for the effects of NO2 on the measurements of NOx detectors at other locations, such as the input and the output of an SCR system. A controller uses the difference in measured NOx volume fractions between the NOx detector at the exhaust and other NOx detectors to modify the operation of the combustion engine system as well as, in some examples, determine NO2 created by a device containing a precious metal catalyst, such as precious metal containing diesel particular filter (DPF) and / or a diesel oxidizing catalyst (DOC), that oxidizes a portion of the exhaust from NO to NO2.

The invention discloses a method for relieving and eliminating sewage anaerobic fermentation stink. The method comprises the following steps: mixing malodorous gas generated by anaerobic fermentation with nitrogen dioxide, and carrying out gas-phase oxidation reaction; the reacted gas is subjected to ultraviolet photolysis treatment, so that nitrogen dioxide is decomposed to generate ozone; and the generated ozone is utilized to continuously oxidize the malodorous substances. The method can also comprise a source sulfur fixation step: adding a sulfur fixation agent into the anaerobic fermentation system, and reducing the generation of hydrogen sulfide from the source. Nitrogen dioxide can be prepared from steel cylinder gas, industrial waste gas or on site, and the on-site preparation comprises an ammonia water / ammonium salt catalytic oxidation method and a nitric acid reduction method. Through multi-stage cooperation of'source sulfur fixation + NO2 gas-phase oxidation + UV ozone conversion + ozone continuous oxidation ', efficient removal of malodorous gas is achieved, an ozone generator does not need to be additionally arranged, nitrogen dioxide residues are thoroughly eliminated, secondary pollution is avoided, equipment is compact, and the operation cost is low.

A method of reducing the emission of nitrogen oxide and / or nitrogen dioxide from a diesel engine combusting a diesel fuel composition, the method comprising dosing into the diesel fuel composition as an additive at least one ester compound; wherein the ester compound is the reaction product of: a) an optionally substituted polycarboxylic acid or an anhydride thereof; and b) an alcohol of formula H-(OR)n-OR1, wherein R is an optionally substituted alkylene group, R1 is hydrogen or an optionally substituted hydrocarbyl group and n is 0 or a positive integer; provided that n is not 0 when R1 is hydrogen.

The invention discloses a nano spherical SnPd oxide, which is prepared by the following steps: firstly, cross-linking tannic acid and formaldehyde at room temperature by taking F127 as a surfactant, then adding stannous sulfate and palladium nitrate dihydrate for chelation, carrying out hydrothermal reaction to obtain a SnPd phenolic hybrid, and finally, calcining to obtain the nano spherical SnPd oxide, namely SP for short. SP is an n-type semiconductor, and the chemical composition of SP is SnO2 and Pd; the diameter of the mesoporous nanosphere is 100-150nm, and the average pore size of the mesoporous nanosphere is 5-7nm. The preparation method comprises the following steps: 1, preparing the SnPd phenolic hybrid SPZ; 2, preparation of an SnPd oxide SP; according to the SP-based hydrogen sensor and the preparation method thereof, the response value is 14.6, the response time is 1.5-2 seconds, the recovery time is 7-10 seconds, and the minimum hydrogen concentration detection is 0.2 ppm; the cycling stability reaches 30 days; the catalyst has selectivity on ammonia gas, methane, carbon dioxide, carbon monoxide and nitrogen dioxide.

The invention relates to the technical field of adsorbents, in particular to a multi-element gas adsorbent as well as a preparation method and application thereof. The preparation method of the multi-element gas adsorbent provided by the invention is simple, economic and environment-friendly, and is suitable for industrial large-scale production. The prepared adsorbent is regular in morphology and rich in various active sites, and sulfur dioxide, nitrogen dioxide and ammonia gas in air can be effectively adsorbed. Compared with the prior art, the CHO-SBA-PEI multi-element gas adsorbent prepared by the preparation method disclosed by the invention combines a mesoporous structure (high specific surface area and regular pore channels) of SBA-15, amino active sites of PEI and aldehyde groups modified in the pore channels of SBA-15, not only realizes multi-element absorption of SO2, NO2 and NH3, but also has high adsorption capacity, and can effectively purify gas entering a hydrogen energy fuel cell. The preparation process is simple and controllable, does not need special equipment, is easy for large-scale production, and is suitable for industrial application of the hydrogen energy fuel cell air filter.

This application provides a method, apparatus, device, and storage medium for monitoring carbon and nitrogen emission data of emission sources. The method acquires observed concentration data of carbon dioxide, nitrogen dioxide, and wind field data for a target emission source; it performs spatiotemporal alignment and correlation of the carbon dioxide and nitrogen dioxide concentration observation data to obtain multiple observation data pairs; if preset plume identification conditions are met, it fits the plume concentration distribution based on the multiple observation data pairs to obtain the linear density of carbon dioxide and the linear density of nitrogen dioxide; using a nitrogen dioxide concentration decay correction model characterizing the chemical change law of nitrogen dioxide during atmospheric transport, it corrects the nitrogen dioxide linear density to obtain the linear density of nitrogen oxides; and based on the carbon dioxide linear density and the nitrogen oxide linear density, it determines the carbon-nitrogen emission rate ratio of the target emission source. The embodiments of this application can improve the accuracy of the carbon-nitrogen emission rate ratio.

The application relates to the fine chemical technology field and discloses a method for synthesizing N,O-dimethyl-N'-nitroisourea, which specifically comprises the following steps: mixing urea and an imidazole ionic liquid, adding dimethyl carbonate drop by drop under temperature rising, performing heat preservation reaction, opening a vacuum, continuously removing low-boiling substances in a slow temperature rising process, cooling, stirring, adding fuming nitric acid drop by drop, stirring and temperature rising, performing heat preservation reaction, cooling and standing to separate layers, pumping the upper concentrated nitric acid into nitrogen dioxide and oxygen, waiting for reuse, adding 4-6 times of water into the lower ionic liquid and N,O-dimethyl-N'-nitroisourea mixture, stirring and temperature rising, separating layers, taking the upper layer of N,O-dimethyl-N'-nitroisourea-containing aqueous solution, slowly cooling, precipitating white solids, filtering, washing with ice water, drying, and obtaining N,O-dimethyl-N'-nitroisourea, so that the shortcomings of traditional synthesis methods, i.e. the necessity of using dimethyl sulfate and sulfuric acid to generate dangerous waste salt of sodium sulfate and waste mixed acid with high COD, are solved.

This invention relates to a method for preparing and applying a ternary heterostructure nanosheet of tungsten diselenide / tin diselenide / tin monoselenide, belonging to the field of gas sensor technology. The invention discloses a ternary heterostructure nanosheet of tungsten diselenide / tin diselenide / tin monoselenide and its application as a sensing material in a highly selective and sensitive flexible NO2 gas sensor. The invention utilizes a liquid-phase growth method, using SnSe2 nanosheets, ammonium tungstate, and diphenyldiselenoether as raw materials, and varying reaction conditions such as temperature, reaction time, and raw material content to prepare the ternary heterostructure nanosheet of tungsten diselenide / tin diselenide / tin monoselenide. Subsequently, these nanosheets are sprayed onto interdigitated electrodes and dried to form a film, thus preparing a chemielectric resistive gas sensor capable of detecting low concentrations of nitrogen dioxide gas at room temperature. It not only possesses high sensitivity and selectivity but can also be applied to flexible NO2 gas sensing.

The invention belongs to the technical field of gas sensing, and discloses a preparation method of an indium oxide gas-sensitive material based on a bamboo biological template, which comprises the following steps: taking natural bamboo as a biological structure template, introducing an indium source precursor into a template pore channel by a solution impregnation method, drying, and carrying out high-temperature calcination in an air atmosphere. According to the heat treatment process, thermal degradation and removal of the biological template are achieved, decomposition and oxidation of the precursor are synchronously induced, and finally the indium oxide material with the bamboo biological form and the high specific surface area is generated. The obtained material shows high response and recovery speed to nitrogen dioxide gas, the response value exceeds three thousand, meanwhile, precious metal and a traditional chemical preparation method do not need to be used in the preparation process, and the green chemical concept of saving energy and reducing pollution is achieved.

This document relates to causing computers to perform various actions based on gas sensor readings. Gas sensor readings indicating gas levels of various gases can be employed to predict emotional characteristics of a user. For instance, a gas sensor placed near a user's mouth can obtain gas sensor readings indicating levels of nitrogen dioxide, ethyl alcohol, volatile organic compounds, and / or carbon monoxide in the user's breath. Then, gas sensor readings can be used to obtain gas level features, which are input to a trained machine learning model. The trained machine learning model can output a predicted emotional characteristic of the user, such as valence or arousal. Then, a computer can perform an action based on the predicted emotional characteristic. For instance, the action can include adjusting behavior of an automated agent, e.g., to help a distressed user calm down, outputting an alert when the user is in distress, etc.

Title of the invention: Chimney for plume reduction in a CO2 capture installation. A chimney for venting gas from a CO2 capture installation comprises an elongated hollow body open upwards to the atmosphere and means for bringing the NO2-containing gas into the elongated hollow body, the body comprising means for diluting the gas by mixing it with atmospheric air. No figure

The invention discloses a ZnO / ZnS / ZnSO4 nano composite material and a gas sensor based on the ZnO / ZnS / ZnSO4 nano composite material, a ZnO / ZnS heterojunction composite material with rough spherical morphology is prepared by adopting a two-step method, part of ZnS in the ZnO / ZnS heterojunction composite material can be converted into ZnSO4 through subsequent controllable annealing treatment, so that a ZnO / ZnS / ZnSO4 three-layer composite material is obtained, and finally the ZnO / ZnS / ZnSO4 three-layer composite material is prepared into the gas sensor. And high-performance detection of NO2 gas is realized. The prepared sensor has the characteristics of high sensitivity, good selectivity and strong stability, has relatively high response (65) to 5 ppm NO2 at a relatively low working temperature (110 DEG C), can detect nitrogen dioxide gas with extremely low concentration, and has huge potential in the aspect of developing and detecting low-concentration nitrogen dioxide gas.

This application discloses an aftertreatment system, method, and vehicle that can achieve lower emissions while maintaining a substantially unchanged aftertreatment installation space. The aftertreatment system includes: a first nitrogen oxide (NOx) treatment device for reducing NOx and oxidizing and removing it with ammonia; a particulate matter treatment device for capturing particulate matter and catalytically generating nitrogen dioxide; a second NOx treatment device for reducing NOx and oxidizing and removing it with ammonia; a urea nozzle for injecting urea; a temperature sensor for detecting temperature; and a NOx sensor for detecting NOx concentration.

This application discloses a spatiotemporal prediction algorithm for atmospheric NO2 that combines hyperspectral satellites with artificial intelligence, and relates to the field of pollutant monitoring. The method includes obtaining meteorological monitoring data, hyperspectral satellite monitoring data, and geographic information remote sensing data for a target area; obtaining stratified nitrogen dioxide concentration prediction data for the target area based on the meteorological monitoring data and a preset atmospheric physicochemical model; inverting nitrogen dioxide column concentration data for the target area based on the hyperspectral satellite monitoring data; wherein the spatial resolution of the nitrogen dioxide column concentration data is higher than the spatial resolution of the nitrogen dioxide stratified concentration prediction data; and fusing the nitrogen dioxide stratified concentration prediction data and the nitrogen dioxide column concentration data based on geographic information remote sensing data to obtain nitrogen dioxide concentration prediction data for a target area in the target area at a target time. This application can obtain nitrogen dioxide concentration prediction data with higher spatial resolution and greater accuracy.

The invention belongs to the technical field of gas sensors, and discloses a visible light excitation type nitrogen dioxide gas sensor based on a Bi2S3 / SnS2 heterostructure and preparation and application thereof, and the gas sensor comprises a gas sensitive material, an interdigital electrode and an LED light source. The preparation method specifically comprises the following steps: preparing bismuth sulfide with the microstructure of a nanorod structure and tin disulfide with the microstructure of a micron sheet structure by adopting a hydrothermal method to form a heterostructure composite material, uniformly coating the gas sensitive material on the surface of an interdigital electrode taking an aluminum oxide substrate as a substrate, and vertically placing an LED light source right above the gas sensitive material. The invention has the advantages of low price, simple preparation process, compatibility with CMOS (Complementary Metal Oxide Semiconductor) process, easiness in microminiaturization and integration with other microelectronic devices and the like.

The invention relates to the technical field of tail gas treatment, in particular to an organic waste gas incineration tail gas treatment device which comprises a reaction container and a product container, a Laval pipe is arranged in a reaction cavity, and a suction inlet used for sucking a reaction solution is formed in a contraction section of the Laval pipe; a converging filler is mounted at the part, directly facing the butting port, of the product cavity of the product container, and after the airflow collides with the converging filler and is decelerated, the small liquid drops are gathered in the converging filler to form large liquid drops and then drop down; according to the device, airflow is subjected to first-stage acceleration through the Laval pipe, airflow is subjected to second-stage acceleration through the airflow channel, and therefore the gas-liquid two-phase velocity difference is increased, broken fog drops can be further atomized under the strong action of gas power to form water mist, the water mist can promote nitrogen dioxide to be dissolved in the water mist, nitrate is formed in the water mist, and the nitrogen dioxide can be dissolved in the water mist to form nitrogen dioxide. Nitrate in the water mist and carbon dioxide in the combustion tail gas can generate urea, so that nitric oxide in the tail gas is removed, and useful fertilizer is generated.

The present invention relates to a catalyst composition for suppressing the occurrence of yellow smoke caused by nitrogen dioxide discharged during incomplete combustion of a stationary source of pollution, a method for manufacturing the same, and a method for treating yellow smoke emission by applying a yellow smoke emission reduction catalyst comprising a mixture of a first component of vanadium / titanium dioxide and a second component of copper / zeolite, compared with vanadium-based selective catalytic reduction (V-SCR), the NO2 adsorption performance can be improved by about 4 times, and the low-temperature denitration (DeNOx) performance can be improved by about 40% p.

In order to simply and efficiently treat nitrogen dioxide in cement exhaust gas and reduce environmental burden by a method for producing ammonium nitrate, the present invention comprises: a nitrogen dioxide recovery step for bringing nitrogen dioxide in cement exhaust gas into contact with water to form a liquid containing NOx; a reduction reaction step in which ammonia is generated by bringing a reducing catalyst into contact with the NOx-containing liquid; an ammonia recovery step in which the ammonia is gasified using the waste heat gas; a solid-liquid separation step in which the remaining part after ammonia recovery is subjected to solid-liquid separation and iron hydroxide is separated from the remaining part of NOx that is not used; a neutralization step for producing ammonium nitrate by bringing the separated liquid containing nitrate nitrogen and / or nitrite nitrogen and the separated liquid containing NOx into contact with ammonia recovered by gasification; and a catalyst production step in which the magnetite used in the reduction reaction step is obtained by reacting ferric sulfate with an aqueous sodium hydroxide solution and performing solid-liquid separation, and the aqueous sodium sulfate solution during the solid-liquid separation is separated into sodium hydroxide and sulfuric acid by electrodialysis, the sodium hydroxide is recycled in the preparation of the magnetite.

The present application relates to a method of manufacturing a perovskite solar cell and a perovskite solar cell manufactured by the method, and more particularly, to a method of manufacturing a perovskite solar cell and a perovskite solar cell manufactured by the method, the method including the steps of: (S1) performing a) oxidant treatment, or b) ultraviolet and ozone treatment, or c) oxygen plasma treatment, or d) nitrogen dioxide gas treatment on a hole transport layer (HTL) of a laminate sequentially layering a base layer, a first electrode layer, and the HTL containing a metal oxide, to oxidize the metal oxide; and (S2) sequentially layering a perovskite layer, an electron transport layer, and a second electrode layer on the HTL of the laminate.

1. Name of the product in this design: Multi-parameter sensor for mining. 2. Application of this design: This design is mainly used to measure the concentration of various gases such as methane, carbon monoxide, and oxygen in coal mines and environments where gas and coal dust explosions occur. It can also detect the concentration of gases such as carbon dioxide, nitrogen dioxide, ethylene, and acetylene by replacing the detection components, and realize data communication and audible and visual alarms. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D rendering 1.

The application provides a tunnel fan control method and relates to the field of traffic facility management.The tunnel fan control method comprises the following steps: S1, calculating the variation rate of carbon monoxide co within a certain time t; S2, calculating the variation rate of visibility vi within a certain time t; S3, calculating the variation rate of wind speed fs within a certain time t; S4, calculating the growth rate of nitrogen dioxide No2 within a certain time t; S5, calculating the growth rate of traffic flow Car within a certain time t; S6, substituting the formula calculation results of S1-S5 into formula six, so as to obtain a ventilation index y; and S7, converting the y value obtained in S6 into a required fan number value.Through the fan control strategy algorithm based on multi-element data fusion, the problem of insufficient single threshold control is solved, the fan control is upgraded from single control to linear control, the intelligentization and rationalization of the fan automatic control are improved, the tunnel driving environment is more fitted, and the energy saving and emission reduction purposes are achieved.