1, honeycomb activated carbon product characteristics
Honeycomb activated carbon has a relatively large area, microporous structure, high adsorption capacity, high surface activated carbon products, and is widely used in air pollution control. The honeycomb activated carbon adsorption method is adopted, that is, the exhaust gas is in contact with the porous activated carbon having a large surface, and the pollutants in the exhaust gas are adsorbed and decomposed, thereby purifying. The pollutants that can be removed by using honeycomb activated carbon are: nitrogen oxide, carbon tetrachloride, chlorine, benzene, diformaldehyde, acetone, ethanol, diethyl ether, methanol, acetic acid, ethyl ester, styrene, phosgene, malodorous gas, and the like. The modified honeycomb activated carbon impregnated with a chemical reagent can be removed: acid mist, alkali mist, amine, mercaptan, sulfur dichloride, hydrogen sulfide, ammonia, mercury, carbon monoxide, dioxins, and the like.
2, honeycomb activated carbon use instructions to control air pollution is best to use honeycomb activated carbon, two adsorbers in parallel, can be used to treat intermittent exhaust, there can be used for continuous exhaust, one of which is adsorption, another adsorber Desorption regeneration is carried out, and the desorbed pollutants are catalytically burned and then emptied. The use of honeycomb activated carbon should avoid high temperature as much as possible, because the high temperature will reduce the amount of adsorption, and the adsorption effect will decrease due to the temperature rise. At the same time, it is necessary to avoid high dust content in the gas, because the tar dust mist will block the pores of the activated carbon, increase the wind resistance, and reduce the adsorption effect. In this case, a dust filter device should be installed in front of the honeycomb activated carbon to improve the efficiency and service life.
3, honeycomb activated carbon parameters main components of the normal compressive strength of activated carbon is greater than 0.8MPa Common specifications 50 * 50 * 100mm, 100 * 100 * 100mm use temperature less than 400 degrees Celsius hole density 100 holes / square inch, 150 holes / square inch air tower wind speed 0.8 The meter/second specific surface area is greater than 700 square / gram. The surface of the product is flat and has no cracks. Note: Other specifications can be produced according to user requirements.
Honeycomb activated carbon product features:
It is widely used in various organic waste gas purification systems with low concentration and high air volume. The treated exhaust gas can fully contact with the activated carbon when passing through the square hole of the honeycomb activated carbon, the adsorption efficiency can reach 67.16%, the drag coefficient is small, and has excellent adsorption, desorption performance and gas dynamic performance, and can be widely used for purifying and treating toluene. Organic gases such as xylene, benzene, and other benzenes, phenols, lipids, alcohol aldehydes, malodorous gases, and various gases containing trace metals. The environmental protection equipment adopting honeycomb activated carbon has high purification efficiency, small adsorption bed volume and low energy consumption of equipment, which can reduce the cost and operation cost, and the purified gas fully meets the environmental emission requirements.
[Atomic Structure of Porous Adsorption Coconut Shell Activated Carbon]
Coconut shell activated carbon adsorption refers to the adsorption of one or more substances in water by the solid surface of activated carbon to achieve the purpose of purifying water.
Adsorption capacity and adsorption rate are the main indicators for measuring the adsorption process. The amount of adsorption capacity is measured by the amount of adsorption. The adsorption speed refers to the mass-free adsorption of the unit weight adsorbent per unit time. In water treatment, the adsorption rate determines the contact time between the wastewater and the adsorbent.
Activated carbon, which is known as a coconut shell activated carbon porous adsorbent, is basically an amorphous material composed of fine graphite-like crystallites and hydrocarbon moieties that connect them together. The gap between the solid portions forms pores, giving the coconut shell activated carbon a unique adsorption property. A substance known as a porous adsorbent includes zeolite in addition to activated carbon. In activated carbon, the solid crystallites and the pores in the gap have complex structures, which theoretically make it much more difficult than zeolite. In this section, firstly, it is theoretically possible to grasp the minimum unit atom of the activated carbon structure, and then pay attention to its structural unit, and explain the atomic structure that is the functional basis for understanding the coconut shell activated carbon.
The coconut shell activated carbon atom has two valence electrons of (2s)2 and (2p)2, and forms three mixed orbitals of sp, sp2 and sp3 upon chemical combination. In particular, the structure of the basic structural unit constituting the activated carbon is formed by the mixed track of the material and has a bonding angle of 12}. Plane structure. Strictly speaking, the carbon atoms of activated carbon are the only regular structure that can be seen in a towel. The ternary crystal formed by the regular laminated structure of the basal plane formed by the carbon atoms thus arranged is called graphite, and a peak formed by the ternary structure can be observed by X-ray diffraction. However, although the carbon solids constituting the pore walls of the activated carbon are called graphite-like crystallites, the binary lattice does not have a regular laminated structure such as graphite, and the solid in the pore walls of the activated carbon cannot be called crystal.
When it comes to the function of coconut shell activated carbon as an adsorbent material, the pore size of activated carbon becomes the focus. However, direct measurement is difficult for the pore size of the void. Therefore, the size of the pores can be estimated by a method of determining the size of the graphite-like crystallites forming the pore walls. The size of the graphite-like crystallites can be determined by X-ray diffraction or by an electric microscope. In X-ray diffraction, the degree of decomposition of microcrystals decreases, and diffraction line dispersion can be seen.
The structure of activated carbon is not simple, and has various heterogeneities, and the size of each crystallite varies, which is also related to the pore size distribution. On the other hand, the constituent elements of activated carbon include not only carbon but also other elements such as nitrogen, oxygen, and hydrogen, which are attached and desorbed in the form of surface functional groups. Moreover, the structure of the activated carbon is not necessarily a strong structure. The crystallites of activated carbon will change in structure as they are absorbed by other molecules.
[Adsorption principle of purifying fruit shell activated carbon]
The produced shell ash has an iodine value of 1000 or more, uniform particles, large specific surface area, strong adsorption capacity, high temperature and low water quality, and good or bad water quality. The higher the water temperature, the stronger the adsorption capacity of activated carbon; if the water temperature is above 30 °C, the adsorption capacity reaches the limit and there is a possibility of gradual decrease. When the water quality is acidic, the adsorption capacity of activated carbon for anionic substances is relatively weakened; when the water quality is alkaline, the adsorption capacity of activated carbon for cationic substances is weakened. Therefore, the pH of the water is unstable, which will also affect the adsorption capacity of activated carbon.
The adsorption principle of the activated carbon of the shell is to form a balanced surface concentration on the surface of the particles, and then adsorb the impurities of the organic substances into the activated carbon particles, and the adsorption effect at the initial stage is high. However, after a long period of time, the adsorption capacity of activated carbon will be weakened to varying degrees, and the adsorption effect will also decrease. If the water in the aquarium is turbid and the organic content in the water is high, the activated carbon will soon lose its filtering function. Therefore, activated carbon should be cleaned or replaced regularly.
The shell activated carbon is made from a variety of shell raw materials, and the size of the particles also has an effect on the adsorption capacity. In general, the smaller the shell activated carbon particles, the larger the filtration area. Granular shell-shell activated carbon is not easy to flow due to particle formation, and impurities such as organic matter in water are not easily blocked in the activated carbon filter layer, and its adsorption capacity is strong, and it is convenient to carry and replace.
The higher the iodine value of the activated carbon of the shell, the stronger the adsorption capacity is easily proportional to the time of contact with water. The longer the contact time, the better the water quality after filtration. Note: The filtered water should flow out of the filter layer slowly. The new activated carbon should be cleaned before the first use, otherwise black ink will flow out. Before the activated carbon is installed in the filter, it should be spread with 2~3 cm thick sponge at the bottom and top to prevent the penetration of large particles such as algae. After 2~3 months of activated carbon, if the filtration effect is reduced, it should be exchanged. New activated carbon and sponge layers should be replaced regularly.
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