In recent years，Due to the continuous upgrading of domestic environmental protection policies,，Natural gas has become the main fuel for many Asphalt Mixing Plants.，But when fueled by natural gas,，Production sites of some asphalt mixing stations with low environmental protection standards，It is easy to produce asphalt smoke，Often accompanied by a pungent odor.。
Asphalt fume is one of the most important air pollutants in the production of natural gas mixing plants.，It is closely related to the prevention and control measures taken by the production equipment。How to prevent and deal with the asphalt flue gas produced in the production process of asphalt mixing station？There are several ways to solve this problem.。
Incineration treatment
Asphalt fume is led to the Burner from the finished product bin，The induced draft system draws asphalt fumes into the Burner flames，The collected flue gas is ejected from the annular air duct of the Burner，Uniformly enter the air duct at the flame in the drying drum。
The most effective collection method at the discharge port is to set a passage with a rolling shutter door at the discharge port.。By mounting the control unit at the discharge opening，Asphalt flue gas is collected through the adjustment and control of the wind shield.。
Adsorption and collection
Adsorption collection is mainly divided into electrostatic、Media filtration、Three kinds of powder-wrapped cigarette，
(One) Static electricity
Asphalt flue gas passes through the primary channel，Pitch fume particles are ionized by the high voltage DC electrode and carry negative charges.，After entering the secondary channel，The hydrocarbon particles are separated from the gas stream by adsorption at the positive electrode，The treated gas stream is discharged directly into the atmospheric。Electrode of electrostatic precipitator shall be cleaned regularly.，To eliminate particle packing。
（Two）Media filtration
Bitumen fumes are drawn into the filtration system，Part of the flue gas is first condensed and flows into the storage tank.，The remaining flue gas enters the secondary filter.。First stage primary filtration of condensate droplet，The second stage oil mist filter plays the role of asphalt smoke filtration.，The filtered flue gas is discharged into the atmosphere by the fan.。Commonly used to collect smoke particles，Not suitable for high concentrations of fine particles。In order to ensure the normal operation of the adsorption device,，The filter element needs to be replaced frequently。
（Three）Powder wrapped in smoke
Similar to bag filter，The powder-coated smoke filter is made by adding fiber material into the pipeline of asphalt smoke.，Allow it to mix well with the asphalt fumes，And then remove by a bag-type dust remover.。Powder-wrapped smoke filter device adopts three filtering method： Crash 、Interception and Brownian diffusion。Impact refers to the collision of asphalt smoke particles with the filter screen.，This method is more than 3.μmThe particles are effective；Intercept is used to collect 1~3μmSmall particles in the range；Brownian diffusion is used to collect submicron particles.。The principle is：Submicron particles under the action of air flow，A convolution is generated along the arc track.、Translational equi-Brownian motion，Collide with that fibers of the filt screen to be collected，Thereby removing it from the air stream.。The powder-wrapped smoke method requires regular replacement of the filter screen，To meet the pressure difference requirements of the dust remover。
Low-temperature plasma flue gas purification method
In the low-temperature plasma asphalt flue gas purification technology,，Mainly high-voltage pulsed high-energy electron radiation、Three principles and functions of ultraviolet decomposition and ozone oxidation。The technology can well destroy the macromolecular structure in the asphalt smoke.，To produce small molecules。Collision of Plasma with Molecules in Asphalt Smoke under the Action of Ozone，Uch that the high energy electrons generated in the plasma structure are excited to a higher energy state，Excited state molecules are formed，Break the chemical bonds of the internal structure of the hydrocarbon substance to form an active substance，The end product isCO2 andH2O。
UVPhotocatalytic oxidation purification method
UVThe photocatalytic oxidation purification method has a strong ability to decompose the molecules of asphalt flue gas.，Can efficiently remove volatile organic compound（VOCs），Especially for some malodorous gases，Deodorization efficiency up to 99%Above。UVThe principle of photocatalytic oxidation purification method is as follows:UVUnder ultraviolet lightVOCs Class ，Benzene、Toluene、Molecular chain structure cracking of organic or inorganic macromolecular malodorous compounds such as xylene，Decompose into small molecular structures、Atoms and intermediates, etc.，And then is convert into a low molecular compound under that action of a nano catalyst.，Such asCO2 andH2OEtc。
Condensation method
The methods adopted for asphalt smoke emission at the asphalt tank include：One is the use of steam recovery devices.，The device discharges the asphalt fume from the tank to the asphalt pipeline through condensation.。Condly, a condenser is used for treating the asphalt smoke in the asphalt tank;，The exhaust condenser itself consists of several circular finned tubes.，Asphalt fume is condensed and discharged back to the tank，The purified air is discharged into the atmosphere through the vent。
Maleny for different types of brands of Asphalt Mixing Plant，Provide a full range of environmental upgrading services。According to the specific needs of customers， Reasonably designed reconstruction scheme，The pollutant discharge of the existing Asphalt Mixing Plant in the production process is minimized.。
400 066 0195
（Environmental Protection Upgrading Service Hotline）
