Industrial organic waste gas treatment VOCs waste gas treatment method is good

In the waste gas treatment equipment, catalytic combustion is favored by enterprises because of its high exhaust gas treatment efficiency, can treat organic waste gas in a variety of industries, and has no secondary pollution.

Activated carbon adsorption and desorption characteristics:

1.High purification efficiency: activated carbon fiber has a good adsorption effect on organic waste gas, which meets the requirements of environmental protection.

2.Through the desorption and regeneration process, the activated carbon fiber has a long service life, which can effectively reduce the secondary pollution and treatment cost caused by the saturation of the adsorption filter material.

3.The catalytic combustion treatment process is adopted, and the honeycomb ceramics impregnated with excellent palladium and platinum are used as catalysts, with a catalytic purification rate of more than 97%, a long catalyst life, low exhaust gas decomposition temperature, short desorption preheating time and low energy consumption.

4.The equipment design principle is advanced, the material use is unique, the performance is stable, the structure is simple and reliable, energy saving and labor-saving, the investment is less, the equipment occupies a small area, and there is no secondary pollution.

5.The honeycomb ceramic as the carrier catalyst is applied to the catalytic combustion chamber, which has the advantages of low resistance and high activity, and can maintain spontaneous combustion when the organic vapor concentration is more than 2000ppm.

6.Due to the low resistance of the bed, the low air pressure fan not only consumes less electricity, but also has low noise. In catalytic combustion, electric heating is required to start. After catalytic combustion of organic matter in the catalytic bed, the heat of combustion of the organic matter is sufficient to maintain the temperature required for the reaction.

7.The system has a high degree of automation, reliable operation, and sets up alarm functions such as catalytic chamber over-temperature alarm, adsorption bed over-temperature alarm, fan failure, valve failure, etc., when the desorption stops, the fan can delay the operation to ensure the reliable operation of the equipment.

The catalytic combustion method used in catalytic combustion equipment belongs to the thermal failure method. Its mechanism is oxidation and pyrolysis, thermal decomposition of the organic components in the exhaust gas, so that it is converted into CO2 and H2O, the purification efficiency of catalytic combustion is generally more than 97%, is a high-concentration, small-flow organic waste gas purification technology.

Commonly used organic waste gas treatment methods include photo-oxygen catalysis, low-temperature plasma, microwave catalysis, catalytic combustion, activated carbon adsorption, etc., which are suitable for different treatment methods due to different industries and concentrations.

Photo-oxygen catalytic oxidation treatment: The special high-energy and high-ozone UV ultraviolet beam is used to irradiate the exhaust gas, so that the molecular chain of organic or inorganic polymer compounds reacts with ozone to form low-molecular compounds under the irradiation of high-energy ultraviolet beams.

Activated carbon adsorption treatment method: the adsorption function of the adsorbent is used to transfer the organic waste gas substance from the gas phase to the solid phase, which is suitable for the treatment of organic waste gas with low concentration and high purification requirements.

Low-temperature plasma exhaust gas treatment method: the plasma produces particles rich in extremely high chemical activity, and the pollutants in the exhaust gas react with these active groups with high energy, and finally convert into CO2 and H2O and other substances, so as to achieve the purpose of purifying the exhaust gas.

Catalytic combustion exhaust gas treatment method: the organic waste gas substance is fully mixed with the fuel gas at high temperature, and the complete combustion is achieved in the catalyst.

At present, there are two mainstream processing methods in the market. One. Photo-oxygen catalysis (1, spray + UV photolysis + activated carbon adsorption 2, spray + photolysis plasma) 2.

Catalytic combustion (1.)Regenerative Thermal Oxidizer (RTO).However, at present, the domestic environmental protection situation is becoming more and more strict, so the second treatment equipment is recommended, which has a large investment in the early stage of catalytic combustion but low cost in the later stage and good use effect.

It is more suitable for the long-term development and use of enterprises.

VOCs waste gas treatment refers to the treatment process of organic waste gas generated in the manufacturing process.

There are many kinds of VOCs organic waste gas pollutants with different characteristics, so the corresponding treatment methods are also different, commonly used: condensation method, absorption method, adsorption method, biological method, catalytic oxidation method, etc.; In recent years, some new technologies have also been developed by foreign countries: biological method, low-temperature plasma method, etc., and the following is a brief comparison of each process.

1 Condensation

It is to directly introduce the exhaust gas into the condenser for condensation, and the condensate can be separated from the most valuable organic matter. The condensation method requires a high concentration of organic matter in the exhaust gas, and the general organic matter concentration should reach tens of thousands or hundreds of thousands of ppm, and this method is not applicable to low-concentration organic waste gas.

2 Absorption method

The absorption method can be divided into chemical absorption and physical absorption, and most organic waste gases should not be chemically absorbed. Physical absorption requires that the absorbent should have a high affinity with the absorption component, low volatility, and reuse after analysis or distillation after saturation of the absorption solution. This method is suitable for medium and high concentration of waste gas, but it is also difficult to choose a cheap and efficient low volatile absorption liquid, and the problem of secondary pollution is difficult to solve simultaneously, and the purification effect is not ideal.

3 Adsorption method

Through the adsorption of adsorption materials, the organic waste gas can reach a purification rate of more than 90% and 95%, with simple equipment and small investment. This method can use hot air, water vapor, etc. to regenerate the adsorption saturated adsorption materials, which can be recycled and recycled, so as to achieve the purposes of energy saving, consumption reduction, environmental protection and economy.

4 Biological law

This method is developed based on mature biological sewage treatment technology, which has the characteristics of low energy consumption and low operating cost, and has a certain scale of application in foreign countries. The disadvantage is that the contaminants need to have sufficient residence time during mass transfer and digestion, which increases the footprint of the equipment, and because the microorganisms have certain impact load resistance limits, it increases the control of the entire treatment system when it is stopped. At present, this method has a small number of applications in the waste gas treatment of domestic sewage stations, and has little application in industrial waste gas treatment.

5 Regenerative oxidation

The method is to use the heat released by the combustion of natural gas or fuel oil to heat the mixed gas to a certain temperature of 760-820, and stay for a certain time (seconds), so that the combustible harmful substances are decomposed into harmless substances at high temperature. The characteristics of this method: the process is simple, the removal rate is high, and the heat of the heat storage material can reach 90 to 95%, and the operating cost is less, especially for some complex components.

VOCs waste gas treatment is to use various means to dispose of the organic matter in the exhaust gas as much as possible to avoid being discharged into the air.

Generally, the treatment methods of VOCs include adsorption, RTO furnace incineration, RCO furnace incineration, ozone oxidation, microbial treatment and other methods.

At present, the purification methods commonly used for organic waste gas include combustion method, absorption method, etc., and the combustion method is used to treat dichloromethane waste gas, and the chlorine-containing compounds produced will cause secondary pollution; The absorption method generally uses ethanol, ether and benzene as absorbents, which are volatile at room temperature, easy to be carried away by gases to produce new pollution, and the materials can not be directly applied, and they can only be reused after subsequent distillation analysis and purification, so the pollution problem cannot be completely solved.

Hello landlord, according to the questions you raised, the following will be answered in detail for you:

Volatile organic compounds, often denoted by VOCs, are abbreviated for the first letter of the three words Volatile Organic Compounds, and total volatile organic compounds are sometimes denoted by TVOC.

Organic waste gas treatment refers to the adsorption, filtration and purification of organic waste gas generated in the industrial production process. Generally, organic waste gas treatment includes formaldehyde organic waste gas treatment, benzene, toluene, xylene and other benzene organic waste gas treatment, acetone butanone organic waste gas treatment, ethyl acetate waste gas treatment, oil mist organic waste gas treatment, furfural organic waste gas treatment, styrene, acrylic acid organic waste gas treatment, resin organic waste gas treatment, additive organic waste gas treatment, paint mist organic waste gas treatment, Tiannashui organic waste gas treatment and other organic matter air purification treatment.

Hope it helps!

VOC waste gas treatment process methods include: spray + plasma, spray + UV photolysis, spray + photolysis plasma, microbial method, RCO combustion method, concentration method. In practical engineering application, microbial method can be considered for places with small gas volume and low concentration.

For waste gas with flammable properties, it is generally recommended to use spray pretreatment and then other treatment processes.

Advantages and disadvantages of various processes for VOC waste gas treatment:

1. Spray + plasma.

The core principle adopted is plasma field decomposition, which has the following advantages: the equipment occupies a small area and is mainly aimed at low concentrations; Disadvantages: There are certain safety hazards, and the purification effect is unstable.

2. Spray + UV photolysis.

The core principle adopted is ozone decomposition, which has the advantages: high purification effect, stable treatment effect, mainly for medium and low concentrations; Disadvantages: Oxidation residence time needs to be controlled.

3. Spray + photolysis plasma.

The core principle adopted is composite ozone and plasma, which has the following advantages: high purification efficiency, mainly for medium concentrations; Disadvantages: There are certain safety risks.

4. Microbial method.

The core principle adopted is biodegradation, which has the advantages: no secondary pollution, and low energy consumption of the equipment; Disadvantages: high operation requirements, large volume of equipment, need to replenish microorganisms regularly, high maintenance costs.

5. RCO combustion method.

The core principle adopted is high-temperature combustion, which has the advantages: mainly for high-concentration organic waste gas, and the pollutant components are completely decomposed; Disadvantages: high energy consumption, high operation requirements, large equipment volume, and certain safety hazards.

6. Concentration method.

The core principle adopted is extraction and concentration, which has advantages: it is mainly aimed at the valuable components of the waste gas with a single composition, and has economic benefits; Disadvantages: High operability requirements.

In practical engineering application, microbial method can be considered for places with small gas volume and low concentration. For waste gas with flammable properties, it is generally recommended to use spray pretreatment and then other treatment processes.

Thermal destruction method

Thermal destruction method is a solution that immediately and assistively ignites the VOC vapor, or uses a suitable metal catalyst to accelerate the chemical change of the VOC, and finally reduces the concentration value of organic compounds so that it no longer has adverse effects.

The thermal failure method has a good practical effect on solving the industrial waste gas with low concentration value, so it has been widely used in solving the problem of organic waste gas with low concentration.

There are two key types of these methods, namely immediate ignition and catalytic combustion devices. Immediate ignition of the quenching and tempering treatment of industrial waste gas has high efficiency and high relative efficiency, which can be 99% under normal conditions. The catalytic combustion device refers to the acceleration of the chemical change rate of industrial waste gas under the effect of the catalytic reaction bed.

This type of method takes less and less time than immediate ignition, and is the preferred technology for the treatment of organic chemical waste gas with high concentration and small total flow.

Activated carbon absorption method

Porous materials using catalyst carriers (granular activated carbon and activated carbon fibers) capture VOCs in organic exhaust gases. The industrial exhaust gas containing VOCs is sucked by the catalyst carrier according to the activated carbon bed, and the organic waste gas is cleaned and discharged into the air.

The carbon adsorption method is mainly used for the acquisition of human fat and lipid cyclonitrogen oxides, most available chlorine organic solvents, common aldehydes, and some macrolides and esters.

Variable method restoration adsorption technology

The catalyst carrier adsorbs organic compounds under a certain working pressure; When the catalyst carrier adsorbs the saturated state, the adsorbed organic compounds are "released" according to the working pressure transition. It is characterized by being free of air pollutants, acquiring high efficiency, and capable of acquiring reflective organic compounds. However, the actual operation cost of this technology is high, the suction must be pressurized, the adsorption must relieve the pressure, and the use in environmental protection is less.

Causticization

The ignition of organic compounds is removed at an operating temperature of 700 to 1,000, which inevitably has a high fuel cost; In order to reduce fuel costs, it is necessary to purchase heat generation, and there are two methods: the traditional wall-mounted heat transfer, and the new non-constant heat storage heat transfer technology.

Wall-mounted causticizing is to use heat transfer tubes or flat plate wall heat exchangers to capture the heat of clean exhaust gas, which can **40 70 energy, and use ** heat to heat the industrial exhaust gas into the air oxidation system software. After heating, the organic waste gas is then cleaned according to the flame to achieve air oxidation temperature, and the defect of wall heat transfer is that the high efficiency of direct expansion is not high.

The heat of stored causticizing (commonly known as RTO)** is a new non-constant thermal convection method. The key rationale is that the industrial exhaust gas and the cleaned effluent gas replacement circulation system captures the maximum amount of heat generated according to several successive changes in the inflow, and the heat storage system software presents a very high energy acquisition.

VOC exhaust gas treatment equipment.

VOCs and VOCs belong to organic waste gases, and the specific treatment methods are:

1. Dilution and diffusion method.

Principle: The odorous gas is discharged to the atmosphere through the chimney, or diluted with odorless air to reduce the concentration of odorous substances to reduce the odor. Advantages: low cost, simple equipment.

2. Water absorption method.

Principle: Industrial waste gas treatment equipment is to use the characteristics of some substances in the odor to be easily soluble in water, so that the odor components are directly in contact with water, so as to dissolve in water to achieve the purpose of deodorization. Pros:

The process is simple, the management is convenient, the equipment operation cost is low, and the secondary pollution is generated, and the washing liquid needs to be treated. Disadvantages: The purification efficiency is low, it should be used in combination with other technologies, and the treatment effect on mercaptans, fatty acids, etc. is poor.

3. Aeration activated sludge deodorization method.

Principle: The odorous substances are dispersed into the mixture containing the activated sludge in the form of aeration, and the odorous substances are degraded by the microorganisms grown in suspension, and the application range is wide. Advantages: After the activated sludge is acclimatized, the removal rate of the odorous components that do not exceed the limit load can reach above.

4. Multi-medium catalytic oxidation process.

Principle: The reaction tower is filled with a special solid packing, and the packing is compounded with a multi-medium catalyst. When the odorous gas passes through the packing layer under the action of the induced draft fan, the liquid phase compound oxidant sprayed by the industrial waste gas treatment equipment through the special nozzle in the form of a divergent mist is fully contacted on the surface of the solid phase filler, and the pollution factors in the odorous gas are fully decomposed under the catalytic action of the multi-medium catalyst.

Advantages: small footprint, low investment, low operating costs; Easy to manage, out-of-the-box.

5. Low-temperature plasma.

Low-temperature plasma is the fourth state of matter after solid, liquid, and gas-trapped states, and when the applied voltage reaches the ignition voltage of the gas, the gas molecules are broken down, producing a mixture including electrons, various ions, atoms, and free radicals. Although the temperature of the electrons is very high during the discharge process, the temperature of the heavy particles is very low, and the whole system is in a low temperature state, so it is called low-temperature plasma. The low-temperature plasma degradation pollutant method of industrial waste gas treatment equipment is actually to use these high-energy electrons, free radicals and other active particles and pollutants in the exhaust gas to decompose the pollutant molecules in a very short period of time, and then various subsequent reactions to achieve the purpose of degrading pollutants.

The pollution that can be significantly controlled by low-temperature plasma air purification equipment includes: VOCs, odorous gases, odorous gases, oil smoke, dust, and can also be used for disinfection and sterilization. Low-temperature plasma technology is a new purification process, which does not require any additives, does not produce waste water, waste residue, and will not lead to secondary pollution.