Exhaust gas treatment equipment, mainly refers to the use of different process technology, through the recovery or removal, reduce the harmful components of the exhaust emissions, to achieve the protection of the environment, air purification of a kind of environmental protection equipment.
Classification:
Absorption equipment
Absorption method uses low volatile or non-volatile solvents to absorb VOCs, and then separates the VOCs and the absorber by using the difference in physical properties.
The gas containing VOCs enters the tower from the bottom of the absorption tower, and in the process of rising, it comes into countercurrent contact with the absorbent from the top of the tower, and the purified gas is discharged from the top of the tower. After the absorbed VOCs absorbent passes through the heat exchanger, it enters into the top of the stripper tower 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 tower as pure VOCs gas after passing through condenser and gas-liquid separator, and is recycled. This process is suitable for gas purification with high VOCs concentration and low temperature, and in other cases, corresponding process adjustment is required.
Adsorption equipment
In the use of porous solids to deal with fluid mixtures, a component or some components of the fluid can be sucked on the surface and concentrated on it, this phenomenon is called adsorption. Adsorption of waste gas treatment, the object of adsorption is a gaseous pollutant, gas-solid adsorption. The adsorbed gas component is called adsorbent, porous solid material is called adsorbent.
Solid surface adsorption of adsorbent, an adsorbed adsorbent can be detached from the surface of the adsorbent, this now attached. When the adsorption for a period of time, due to the concentration of surface adsorbate, so that its adsorption capacity decreased significantly and adsorption purification requirements, at this time it is necessary to use certain measures to make the adsorbent on the adsorbent adsorbate adsorbate adsorbate desorption, in order to assist the adsorption capacity, a process known as the regeneration of adsorbent. Therefore, in the actual adsorption project, it is the use of adsorption and regeneration again and again adsorption cycle process, to remove the pollutants in the waste gas and the recovery of waste gas in the useful components.
Purification equipment
Combustion method is used to deal with high concentrations of Voc and malodorous compounds is very effective, the principle is to use an excess of air to make these impurities combustion, most of the carbon dioxide and water vapor, can be discharged into the atmosphere. However, when dealing with chlorine and sulfur-containing organic compounds, combustion generates HCl or SO2 in the product, which requires further treatment of post-combustion gases.
Governance equipment
Plasma is in the ionized state of the gas, its English name is plasma, it is by the United States of America science muir, in 1927 in the study of the discharge phenomenon in the mercury vapor under low air pressure named. Plasma consists of a large number of sub, neutral atoms, excited state atoms, photons and free radicals, etc., but the charge number of electrons and positive ions must show electrically neutral, which is the meaning of "plasma". Plasma has many aspects of electrical conductivity and electromagnetic influence that are different from solids, liquids, and gases, so it is also known as the fourth state of matter. Depending on the state, temperature, and ion density, plasma can be divided into high-temperature plasma and low-temperature plasma (bunds and cold plasma). High-temperature plasma has an ionization degree close to 1, and the temperature of various particles is almost the same in the thermodynamic equilibrium state, which is mainly used in the study of controlled thermonuclear reactions. The low-temperature plasma is not in equilibrium, and the temperature of various particles is not the same. The electron temperature (Te) ≥ ion temperature (Ti), up to 104K or more, while the temperature of its ions and neutral particles can be as low as 300 to 500 K. The general gas discharge plasma belongs to the low-temperature plasma.
As of 2013, research on the mechanism of action of low-temperature plasma is considered to be the result of inelastic collisions of particles. Low-temperature plasma rich in electrons, ions, free radicals and excited state molecules, which high-energy electrons and gas molecules (atoms) collision, will be converted to energy into the base state molecules (atoms) of the internal energy, the occurrence of excitation, dissociation and ionization of a series of overstraw in the activated state. On the one hand, the gas molecular bond is opened, generating some single molecules and solid particles; on the other hand, the power to generate ．OH, H2O2, such as free radicals and oxidizing O3, high-energy electrons play a decisive role in this process, the ion's thermal movement is only a side effect. At atmospheric pressure, the gas discharge produces a high degree of non-equilibrium plasma in the electron temperature layer degrees) is much higher than the gas temperature (room temperature of about 100 ℃). Various types of chemical reactions may take place in a nonequilibrium plasma, determined mainly by the average energy of the electrons, the electron density, the gas temperature, the concentration of harmful gas molecules, and the ≥ gas composition. This provides for some reactions that require a large activation energy such as the removal of difficult-to-degrade pollutants in the atmosphere in addition to low concentration, high flow rate, large air volume containing volatile organic pollutants and sulfur-containing pollutants.
The common method of generating plasma is a gas discharge, the so-called gas discharge refers to a mechanism to make an electron from the gas atoms or molecules ionized, the formation of the gas medium known as the ionized gas, if the ionized gas from the external electric field and the formation of conduction current, this phenomenon is called gas discharge. According to the discharge mechanism, the nature of the gas pressure j source and the geometry of the electrode, 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 generated, high voltage discharge is required. It is easy to fire and produce danger. Since the treatment of, for example, gaseous pollutants, it is generally required to be carried out at atmospheric pressure.
5, photocatalysis and biological purification equipment
Photocatalysis is room temperature depth reaction technology. Photocatalytic oxidation can completely oxidize the organic pollutants in water, air and soil into non-toxic and harmless products at room temperature, while the traditional high temperature incineration technology needs to destroy the pollutants at a very high temperature, i.e., it needs a high temperature of several hundred degrees to use the conventional catalytic and oxidative methods.
Theoretically, as long as the light energy absorbed by the semiconductor is not less than its bandgap energy, it is sufficient to generate electrons and holes, and the semiconductor may be used as a photocatalyst. Most common single-compound photocatalysts are metal oxides or sulfides, such as Ti0, Zn0, ZnS, CdS and PbS. Each of these catalysts has outstanding advantages for specific reactions, and can be selected according to the needs of specific studies. For example, the semiconductor bandgap energy of CdS is small, and has a good match with the near-ultraviolet band of the solar spectrum, so that it can make good use of natural light energy, but it is prone to photocorrosion, and its service life is limited. Comparatively speaking, Ti02 has better overall performance and is the most widely used and studied single compound photocatalyst.
So you need to know the specific price, you need to determine the type of equipment and so on, you want to know more about the problem of waste gas treatment equipment, you can consult Guangzhou Zhongchuang Environmental Protection Technology Co.