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What are the methods for chemical waste gas treatment?

Views: 10     Author: Xichegn Ep Ltd     Publish Time: 2021-08-28      Origin: Xichegn Ep Ltd

Organic waste gas is more difficult to deal with in industrial waste gas, and after organic waste gas enters the human body through the respiratory tract and skin, it may cause temporary and long-lasting diseases to human breathing, blood, liver and other systems and organs.

Treatment method of organic waste gas treatment method:


1. Organic waste gas treatment method-condensation recovery method


Working principle: The condensation method adopts a multi-stage continuous cooling method so that the temperature of each hydrocarbon component in the mixed oil and gas is lower than the freezing point from gaseous to liquid. Except for water vapor, the air remains in the gaseous state, thereby realizing the oil and gas and air Separation can recover valuable organic matter.


Advantages and disadvantages: its key components, compressor and throttling mechanism, have all realized localized production, with low investment and operating costs; simple parallel cutting equipment, high degree of automation, convenient maintenance, good safety, and the output is liquid oil which can be directly used, etc. advantage. However, auxiliary refrigeration equipment is required, and the system process is relatively complicated. Applicable conditions: working conditions with a high concentration of organic waste gas, low temperature, low air volume, organic matter with recycling value.


2. Organic waste gas treatment method-adsorption method


Working principle: The exhaust gas is adsorbed by activated carbon. When the adsorption is saturated, the activated carbon is desorbed and regenerated. It is currently the most common purification treatment technology for industrial organic waste gas in my country. At present, new breakthroughs have been made in the recovery of organic solvents, and organic waste gas can be recycled and reused.


Advantages and disadvantages: high purification efficiency and low cost.

Disadvantages: It is difficult to regenerate, needs to be replaced constantly, the equipment is huge, the process is complicated, and the operating cost is high. It is not suitable for an environment with high humidity. When there are colloidal substances or other impurities in the exhaust gas, the adsorbent is easy to poison. Applicable conditions: Mainly used for the treatment of low-concentration, high-throughput volatile organic matter. It has good adsorption performance for benzene waste gas, but poor adsorption performance for hydrocarbon waste gas. Brief introduction of twelve kinds of organic waste gas treatment methods commonly used in China


3. Organic waste gas treatment method-biological method


Working principle: Use the life process of microorganisms to decompose the gaseous pollutants in the exhaust gas into less or even harmless substances. There are various microorganisms in nature, and almost all inorganic and organic pollutants can be transformed.


Advantages and disadvantages: simple equipment, low energy consumption, safe and reliability, no secondary pollution and other advantages.

Disadvantages: Cannot recycle pollutants.


4. Organic waste gas treatment method-liquid absorption method


Working principle: The liquid absorption method uses the principle of similar compatibility between liquid absorption liquid and organic waste gas. Generally, a mixture of liquid petroleum substances, surfactants, and water is used as an absorption liquid to enhance the absorption effect. The exhaust gas is introduced into the absorption liquid to be purified, and after the absorption liquid is saturated, it is heated, analyzed, and condensed for recovery.


Advantages and disadvantages: reusable.

Disadvantages: need to be equipped with heating analysis and recovery device, the equipment is large and the investment is high. Applicable conditions: This law is applicable to exhaust gas with large air volume, low temperature and low concentration.


5. Organic waste gas treatment method-direct combustion method


Working principle: A method in which organic waste gas is introduced into the combustion chamber and directly burns in contact with the flame to burn and decompose the combustible components in the waste gas. This method is divided into two types of combustion without auxiliary fuel and auxiliary fuel. If the concentration of combustible pollutants in the exhaust gas is high and the heating value is large, the combustion temperature (above 800℃) can be maintained by burning the exhaust gas alone, then the former is selected. The concentration of combustible pollutants in the exhaust gas is low, the heating value is small, and auxiliary fuel must be added to maintain the combustion temperature (600~800℃), then choose the latter.


Advantages and disadvantages: the direct combustion method has a simple process and low investment; easy management, simple maintenance, and high reliability; but it requires high processing temperature, consumes a lot of fuel, and requires high safety technology and operation. Applicable conditions: suitable for high-concentration, low-volume exhaust gas.


6. Organic waste gas treatment method-adsorption, catalytic combustion method


Working principle: This method adopts honeycomb activated carbon adsorption, hot air is introduced for desorption and analysis after the activated carbon is close to the drink and the exhaust gas is introduced into the catalytic combustion bed for flameless combustion to completely purify it.


Advantages and disadvantages: Combining the advantages of the adsorption method and catalytic combustion method, hot gas is recycled in the system, which greatly reduces energy consumption, and has the characteristics of stable and reliable operation, low investment, low operating cost, and convenient maintenance. Applicable conditions: It is suitable for the treatment of waste gas with large air volume and low concentration. It is a relatively mature and practical method for the treatment of organic waste gas in China.


7. Organic waste gas treatment method-absorption method


Working principle: The exhaust gas is introduced into the absorption liquid for purification. After the absorption liquid is saturated, it is heated, analyzed, and condensed to be recovered; this method is suitable for large-scale, low-temperature, and low-concentration exhaust gas. The organic exhaust gas is easily soluble in water. Direct contact with water, so as to dissolve in water, to achieve the effect of removing exhaust gas.


Advantages and disadvantages: simple process, convenient management, low equipment operation cost. Disadvantages: secondary pollution occurs, the washing liquid needs to be treated, the purification efficiency is low, the equipment is large, and the investment is high. Applicable conditions: suitable for water-soluble organic gases from organized emission sources.


8. Organic waste gas treatment method-nano micro electrolytic oxidation method


Working principle: Nano-micro electrolysis purification technology uses nano-scale processed piezoelectric materials. Under the condition of a certain humidity, the nano-micro electrolysis material can be electrically adsorbed by the micro-electrolysis electric field and release a large number of hydroxyl anions to the gas. Purification of aerobic pollutants can remove most of the organic matter in the air.


Applicable conditions: Analyze inorganic odors such as ammonia nitrogen and hydrogen sulfide.


9. Organic waste gas treatment method-thermal combustion method


Working principle: The use of regenerative thermal oxidation furnace RTO to treat organic waste gas can achieve the dual effect of high efficiency and energy saving.


Applicable conditions: It is suitable for a wide range of organic waste gas treatments, and the treatment efficiency is high. It is widely used in coating, printing, spraying, medicine and other industries.


10. Organic waste gas treatment method-waste gas scrubber


Working principle: The scrubber is a waste gas treatment technology, which can absorb and dissolve industrial waste gas such as acid mist waste gas treatment, alkali mist waste gas treatment and paint waste gas treatment, paint spray waste gas treatment, organic waste gas treatment, chemical waste gas adsorption, oxidation-reduction, acid-base neutralization It has obvious effects and meets the national industrial waste gas emission standards.


Applicable conditions: Suitable for a wide range of organic waste gas treatment, high treatment efficiency, widely used in spray booths, spray booths, baking booths and other industries.


11. Organic waste gas treatment method-low temperature plasma technology


Working principle: During the dielectric barrier discharge process in the low-temperature plasma exhaust gas treatment equipment, the plasma is rich in extremely chemically active particles, such as electrons, ions, free radicals, and excited molecules. The pollutants in the exhaust gas react with these active groups with higher energy, and finally are converted into CO2 and H2O, so as to achieve the purpose of purifying the exhaust gas.


Applicable conditions: wide application range, high purification efficiency, especially suitable for multi-component malodorous gases that are difficult to deal with by other methods, such as chemical, pharmaceutical, and other industries. The electrons have high energy and can interact with almost all malodorous gas molecules.


Advantages and disadvantages: low operating costs, fast response, the equipment starts and stops very quickly, and it can be opened as needed. Disadvantages: high one-time investment and potential safety hazards.


12. Treatment method of organic waste gas-photocatalytic oxidation

Working principle: The technology of photo-oxygen catalytic waste gas treatment equipment is a special treatment method that uses a special ultraviolet band (C band), under the action of a special catalytic oxidant, to break exhaust gas molecules and further redox. Exhaust gas molecules pass through a special band of high-energy ultraviolet light waves to break organic molecules and break their molecular chains; at the same time, by decomposing oxygen and water in the air, high concentrations of ozone are obtained, and ozone further absorbs energy to form free hydroxyl groups with higher oxidation performance. Exhaust gas molecules. At the same time, a variety of composite inert catalysts are configured according to different exhaust gas components, which greatly improves the speed and efficiency of exhaust gas treatment, so as to achieve the purpose of purifying exhaust gas.

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