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Process and advantages and disadvantages of activated carbon adsorption equipment-Novo Environmental Protection Equipment

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Process and advantages and disadvantages of activated carbon adsorption equipment

Source: Novo environmental protection equipmentRelease time: 2017-11-9 15:48:10
活性炭吸附设备工艺流程及利弊
The adsorption method is mainly applicable to the purification of low-concentration gaseous pollutants. For high-concentration organic gases, it is usually necessary to first reduce the concentration through processes such as condensation before performing adsorption purification. Adsorption technology is the most classic and commonly used gas purification technology, and it is also one of the mainstream technologies for industrial VOCs treatment. The key technologies of adsorption methods are adsorbents, adsorption equipment and processes, regeneration media, and post-treatment processes.
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(1) Introduction to adsorption process

The adsorption method is mainly applicable to the purification of low-concentration gaseous pollutants. For high-concentration organic gases, it is usually necessary to first reduce the concentration through processes such as condensation before performing adsorption purification. Adsorption technology is the most classic and commonly used gas purification technology, and it is also one of the mainstream technologies for industrial VOCs treatment. The key technologies of adsorption methods are adsorbents, adsorption equipment and processes, regeneration media, and post-treatment processes.

Activated carbon is widely used for adsorption and recovery of organic gases due to its large specific surface area and microporous structure. At present, research on the adsorption of organic gases by activated carbon mainly focuses on the prediction of adsorption equilibrium, the modification of activated carbon materials, and the effects of physicochemical properties of organic substances on the adsorption performance of activated carbon.

(2) Principle and process of activated carbon adsorption process

Activated carbon fiber adsorption of organic waste gas is one of the most advanced technologies in the world today. Activated carbon fiber has a larger adsorption capacity and faster adsorption kinetics performance than granular activated carbon.

(3) Influencing factors of activated carbon adsorption process

(4) The physical adsorption of activated carbon to purify the air, as shown in Figure 2:

The diameter of the molecule is larger than the diameter of the pore. Due to steric hindrance, the molecule cannot enter the pore, so it is not adsorbed.

The molecular diameter is equal to the diameter of the pores, and the trapping force of the adsorbent is very strong, which is very suitable for low concentration adsorption;

The molecular diameter is smaller than the diameter of the pore, capillary condensation occurs in the pore, and the adsorption capacity is large;

The molecular diameter is much smaller than the diameter of the pores, the adsorbed molecules are easily desorbed, the desorption rate is high, and the adsorption amount at low concentrations is small.

(5) Advantages and disadvantages of activated carbon adsorption process

advantage:

Suitable for low concentrations of various pollutants;

The price of activated carbon is not high, the energy consumption is low, and it is more economical to apply;

Solvent organics can be recovered by desorption condensation;

Easy to apply, it can play a role only in contact with air;

Activated carbon has good acid and alkali resistance and heat resistance, and has high chemical stability.

Disadvantages:

The adsorption capacity is small, and there is a problem of adsorption saturation in physical adsorption. As the adsorbent is consumed, the adsorption capacity is also weakened. After a period of use, the adsorption capacity may be small or the adsorption function may be lost;

During adsorption, there is a problem of specificity of adsorption. For mixed gases, the adsorption may be weakened. At the same time, there is also a mismatch between the molecular diameter and the pore diameter of the activated carbon, resulting in desorption.

2. Absorption process

(1) Introduction to Absorption Process

The method of absorbing volatile gas in industrial waste gas with solution, solvent or clear water and separating it from waste gas is called absorption method. Solutions, solvents, and water are called absorbents. Different absorbents can absorb different harmful gases.

The absorption equipment used in the absorption method is called an absorber, purifier or scrubber. The process of the absorption method is similar to the wet dedusting process, except that the wet dedusting process uses clean water, and the absorption method uses a solvent or solution to purify harmful gases.

(2) Absorption process principle and process

3.
Taking oil and gas recovery as an example, oil and gas recovery should include oil and gas produced at oil refineries, chemical plants, and oil and gas stations. Oil and gas from the factory to the sales terminal is a complete system.

The United States and European countries usually adopt one-stage and two-stage oil and gas recovery measures at gas stations, that is, closed oil unloading and refueling, and the oil and gas in the storage tanks are returned to the tanker truck. When refueling, the vacuum auxiliary device or the internal pressure of the tank is used to return to the storage tank . Set up oil and gas recovery devices in oil depots, refineries and other petroleum products distribution sites to recover oil and gas.

Absorption is commonly used for oil and gas recovery. The oil and gas generated during loading and unloading of oil enters the absorption tower, and the lean air is discharged from the outlet. The desorption tower performs vacuum desorption of the absorption liquid, and the desorption absorption liquid is recycled. The recovery tower uses gasoline to recover the desorbed gas that has entered. Return to the absorption tower and repeat the process. The absorption liquid for recovering volatile organic compounds by solution absorption method is usually a special absorption liquid. The selection of the absorption liquid will affect the recovery effect.

(3) Advantages and disadvantages of absorption technology

advantage:

The absorption process is relatively simple, the equipment investment is low, and the operation and maintenance costs are basically equivalent to the carbon adsorption method. Since the absorption medium is kerosene and absorption liquid, there is no secondary pollution problem.

Disadvantages:

This process method has low recovery efficiency, and when environmental protection requirements are high, it is difficult to meet the permitted oil and gas discharge standards; the equipment takes up a large space; the energy consumption is high; the absorbent consumption is large, and it needs to be continuously replenished.


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