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Purification tower

Waste gas treatment equipment is mainly an environmental protection equipment that protects the environment and purifies the air by recovering or removing harmful components of exhaust gas by using different process technologies.
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Waste gas treatment equipment is mainly an environmental protection equipment that protects the environment and purifies the air by recovering or removing harmful components of exhaust gas by using different process technologies.

Absorption equipment

The absorption method uses low-volatile or non-volatile solvents to absorb VOCs, and then uses the difference in physical properties of VOCs and absorbents for separation.

The VOCs-containing gas enters the tower from the bottom of the absorption tower, and is in countercurrent contact with the absorbent from the top of the tower during the ascending process, and the purified gas is discharged from the top of the tower. After the absorbent that has absorbed VOCs passes through the heat exchanger, it enters the top of the stripper, and is desorbed under the condition that the temperature is higher than the absorption temperature or the pressure is lower than the absorption pressure. The desorbed absorbent is condensed by the solvent condenser and returned to the absorption tower. The desorbed VOCs gas leaves the stripper as purer VOCs gas after passing through the condenser and gas-liquid separator, and is recycled. This process is suitable for gas purification with high VOCs concentration and low temperature. In other cases, corresponding process adjustment is required.

Adsorption equipment

When a fluid mixture is treated with a porous solid substance, a component or components in the fluid can be attracted to the surface and concentrated on it, a phenomenon known as adsorption. When adsorbing waste gas, the object of adsorption is gaseous pollutants, gas-solid adsorption. The gaseous components that are adsorbed are called adsorbates, and the porous solid substances are called adsorbents.

After the adsorbate is adsorbed on the solid surface, a part of the adsorbed adsorbate can be detached from the adsorbent surface, which is now attached. When the adsorption is carried out for a period of time, due to the concentration of the adsorbate on the surface, the adsorption capacity is significantly reduced and the adsorption and purification requirements are required. Adsorption capacity, this process is called regeneration of the adsorbent. Therefore, in the actual adsorption project, it is the cycle process of adsorption-regeneration-re-adsorption to remove pollutants in the exhaust gas and recover the useful components in the exhaust gas.

Combustion and catalytic purification equipment of organic waste gas

Combustion is very effective for treating high concentrations of Voc and odorous compounds. The principle is to use excess air to burn these impurities, most of which generate carbon dioxide and water vapor, which can be released into the atmosphere. However, when dealing with chlorine- and sulfur-containing organic compounds, HCl or SO2 is generated in the combustion products, and further treatment of the combusted gas is required.

Treatment equipment for low temperature plasma of industrial organic waste gas

Plasma is a gas in an ionized state, and its English name is plasma, which was named by the American scientific muir in 1927 when he studied the discharge phenomenon in mercury vapor under low pressure. Plasma is composed of a large number of electrons, neutral atoms, excited state atoms, photons and free radicals, etc., but the number of charges of electrons and positive ions must exhibit electrical neutrality, which is the meaning of "plasma". Plasma is different from solids, liquids and gases in many aspects that are electrically conductive and electromagnetically affected, so it is called the fourth state of matter. According to the state, temperature and ion density, plasma can generally be divided into high temperature plasma and low temperature plasma (bottle body and cold plasma). Among them, the ionization degree of high-temperature plasma is close to 1, and the temperature of various particles is almost the same and is in a state of thermodynamic equilibrium. It is mainly used in the research of controlled thermonuclear reactions. The low-temperature plasma is in a non-equilibrium state, and the temperature of various particles is not the same. Among them, the electron temperature (Te) ≥ the ion temperature (Ti), which can reach more than 104K, while the temperature of its ions and neutral particles can be as low as 300-500K. General gas discharge electrons belong to low temperature plasma.

As of 2013, the research on the action mechanism of low temperature plasma is considered to be the result of inelastic collision of particles. Low temperature plasma is rich in electrons, ions, free radicals and excited state molecules, in which high-energy electrons collide with gas molecules (atoms) to convert energy into the internal energy of ground state molecules (atoms), and a series of excitation, dissociation and ionization occur. The straw is in an activated state. On the one hand, the gas molecular bonds are opened, and some single molecules and solid particles are generated; OH, H2O2. In this process, high-energy electrons play a decisive role, and the thermal motion of ions has only side effects. Under normal pressure, the electron thermosphere in the highly non-equilibrium plasma generated by gas discharge is much higher than the gas temperature (about 100°C at room temperature). Various types of chemical reactions may occur in non-equilibrium plasma, which are mainly determined by the average energy of electrons, electron density, gas temperature, harmful gas molecule concentration and ≥ gas composition. This provides for some reactions that require large activation energy, such as the removal of refractory pollutants in the atmosphere. In addition, it can also treat volatile organic pollutants and sulfur-containing pollutants with low concentration, high flow rate, and large air volume.

The common method of generating plasma is gas discharge. The so-called gas discharge refers to ionizing an electron from gas atoms or molecules through a certain mechanism, and the formed gas medium is called ionized gas. If the ionized gas is generated by an external electric field and formed Conduction of electric current, a phenomenon called gas discharge. According to the mechanism of discharge generation, gas pressure source properties and electrode geometry, gas discharge plasma is mainly divided into the following forms: ① glow discharge; ③ dielectric barrier discharge; ④ radio frequency discharge; ⑤ microwave discharge. Regardless of which form of plasma is generated, a high-voltage discharge is required. It is easy to catch fire and create a hazard. Due to the treatment of such gaseous pollutants, it is generally required to be carried out under normal pressure.

Photocatalysis and biological purification equipment

Photocatalysis is a deep reaction technology at room temperature. Photocatalytic oxidation can completely oxidize organic pollutants in water, air and soil into non-toxic and harmless products at room temperature, while traditional high-temperature incineration technology requires extremely high temperature to destroy pollutants, even using Conventional catalysis and oxidation methods also require high temperatures of several hundred degrees.

Theoretically, as long as the light energy absorbed by a semiconductor is not less than its band gap energy, it is sufficient to excite electrons and holes, and the semiconductor may be used as a photocatalyst. Common single compound photocatalysts are mostly metal oxides or sulfides, such as TiO. , ZnO, ZnS, CdS and PbS etc. Each of these catalysts has outstanding advantages for specific reactions, and can be selected according to needs in specific research. For example, CdS semiconductor has a small band gap energy, which has better matching performance with the near-ultraviolet light band in the solar spectrum, and can make good use of natural light energy. , but it is prone to photocorrosion and has a limited service life. Relatively speaking, TiO2 has better comprehensive properties and is the most widely used and studied single compound photocatalyst.

Processing principle

Dilution 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. Scope of application: It is suitable for the treatment of odorous gases with medium and low concentrations. Advantages: low cost, simple equipment. Disadvantages: It is easily limited by meteorological conditions, and odorous substances still exist.

water absorption method

Principle: Using the characteristics of some substances in the odor that are easily soluble in water, the odor components are directly contacted with water, so as to dissolve in water to achieve the purpose of deodorization. Scope of application: water-soluble, odorous gases from organized emission sources. Advantages: simple process, convenient management, low equipment operating cost, secondary pollution, and need to deal with the washing liquid. Disadvantages: low purification efficiency, should be used in combination with other technologies, poor treatment effect on thiols, fatty acids, etc.

Aerated activated sludge deodorization method

Principle: Disperse the malodorous substances in the mixed liquid containing activated sludge in the form of aeration, and degrade the malodorous substances by suspended microorganisms. It is suitable for a wide range of applications. Scope of application: As of 2013, Japan has been used for odor treatment in manure treatment plants and sewage treatment plants. Advantages: After domestication of activated sludge, the removal rate of odor components that do not exceed the limit load can reach more than 99.5%. Disadvantages: Limited by the intensity of aeration, the application of this method has certain limitations.

Multimedia Catalytic Oxidation Process

Principle: The reaction tower is filled with a special solid packing, and a multi-media catalyst is compounded inside the packing. When the odorous gas passes through the packing layer under the action of the induced draft fan, it is fully contacted with the liquid-phase compound oxidant sprayed out in the form of a divergent mist through a special nozzle on the surface of the solid-phase packing, and under the catalysis of the multi-media catalyst, the odorous gas is released. The contamination factors in are fully decomposed. Scope of application: It has a wide range of applications, especially for the treatment of atmospheric volume, medium and high concentration of waste gas, and has a good removal rate of hydrophobic pollutants. Advantages: small footprint, low investment, low operating cost; easy management, ready to use. Disadvantages: It is resistant to impact load, not easily affected by pollutant concentration and temperature changes, and needs to consume a certain amount of chemicals.

low temperature plasma

Low temperature plasma is the fourth state of matter after solid state, liquid state and gas state. When the applied voltage reaches the ignition voltage of the gas, the gas molecules are broken down to produce a mixture including electrons, various ions, atoms and free radicals. . Although the electron temperature is high during the discharge process, the heavy particle temperature is very low, and the whole system is in a low temperature state, so it is called low temperature plasma. The degradation of pollutants by low-temperature plasma is to use these high-energy electrons, free radicals and other active particles and pollutants in the exhaust gas to decompose pollutant molecules in a very short period of time, and to undergo various subsequent reactions to degrade pollutants. the goal of.

The pollution that can be significantly treated by low-temperature plasma air purification equipment are: VOC, malodorous gas, odorous gas, oil fume, dust, and can also be used for disinfection and sterilization. Low-temperature plasma technology is a brand-new purification process that does not require any additives, produces no waste water, waste residue, and does not cause secondary pollution.

Product introduction of acid mist purification tower for waste gas treatment equipment:

The improved acid mist exhaust gas purification treatment tower adopts the latest patented technology of our company and integrates the advantages of similar purification towers at home and abroad. At the same time, the technical parameters of the packing layer and tower body have been optimized, and the purification efficiency can reach 95%. The acid mist exhaust gas after purification is much lower than the national emission standard. It is the ideal high concentration and high temperature at home and abroad. Acid and alkali waste gas purification treatment equipment.

Acid mist waste gas purification treatment tower features:

The improved acid mist waste gas purification treatment tower, the main body can be made of glass fiber reinforced plastic, polyvinyl chloride, stainless steel and other materials. Compared with the general acid mist treatment tower, it has high purification efficiency, compact structure, beautiful appearance and small footprint. , Corrosion resistance, aging, high strength, light weight, convenient transportation and installation, easy maintenance and management.

Application scope of acid mist waste gas purification treatment tower:

Widely used in: lead fume or vapor pollution control in printing, battery, non-ferrous metal smelting, military and other industries; acid mist (H2S04), chemical, smelting, electroplating, printing and dyeing, pharmaceutical, instrumentation, electronic equipment, machinery manufacturing and other industries Hydrogen chloride (HCL) gas and hydrogen fluoride (HF) gas, chromic acid mist (CrO3), hydrogen cyanide (HCN) gas, hydrogen sulfide (H2S), ammonia (NH3), pickling, phosphating waste gas or for hydrogen sulfide , phenols, benzenes, formaldehyde, amines and other malodorous substances, deodorization and purification treatment; in the field of dust removal as a wet dust collector, it is widely used in occasions where the dust concentration is not high but has a certain degree of toxicity. Can meet national emission standards.

Horizontal exhaust gas purification tower (washing tower)

The waste gas scrubber is widely used in the treatment of corrosive gases, including engineering in areas such as electronics, semiconductors, electronic circuit boards, chemical, electroplating, metal, paper, and waste water treatment plants.

Waste gas spray tower (washing tower)

1. Pressure loss: <390-780pa.

2. Applicable temperature: PP material is -10℃-120℃.

3. Vertical tower specifications and treatment capacity: φ300-φ5000mm, waste gas treatment capacity 1000m3/h—100,000m3/h.

4. The specifications of the horizontal tower are designed according to the amount of exhaust gas required by the customer.

It is designed and manufactured with imported PP board as the main material. The inner spray layer is filled with PP polypropylene Raschig rings. According to the gas absorption process, the gas absorption process is carried out on the gas-liquid two-phase interface, and the transfer rate is proportional to the interface area. The filler is used to increase the contact area of the two phases, so that the two phases are fully dispersed to achieve the purpose of waste gas treatment.

Structural features

The PP spray tower can be designed in two types, vertical and horizontal, according to factors such as customer space management. The working principle of the vertical structure is gas-liquid two-phase vertical and reverse contact, and the working principle of the horizontal structure is gas-liquid two-phase cross-flow contact. The exhaust gas is absorbed and neutralized by the liquid phase contact of the packing layer, so as to achieve the effect of exhaust gas purification. The packing layer in the monomer tower can be divided into single layer or multi-layer.


The equipment removal efficiency is as high as 97%, good performance, strong corrosion resistance, light weight, convenient installation and maintenance, high strength, beautiful appearance, small footprint, low operation and maintenance costs in the later stage, etc.

Scope of application

It is suitable for the absorption, washing or purification of waste gas generated by the production process of chemical, petroleum, semiconductor, medicine, food, printing plants, metallurgy, laboratories, electroplating and other industries.

1. Pressure loss: <390-780pa.

2. Applicable temperature: PP material is -10℃-120℃.

3. Vertical tower specifications and treatment capacity: φ300-φ5000mm, waste gas treatment capacity 1000m3/h—100,000m3/h.

4. The specifications of the horizontal tower are designed according to the amount of exhaust gas required by the customer.


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