When the partial pressure or concentration is kept constant, the relationship between the equilibrium adsorption amount and the temperature can be measured, and the relationship curve, that is, the adsorption isobar line, is drawn. Since adsorption of a small amount of components in an industrial device is carried out substantially in an isothermal state, adsorption isotherms are most important and commonly used. The solvent vapor adsorption amount indicates the gas phase adsorption performance, and the measurement of the carbon tetrachloride adsorption rate of the granular activated carbon can be exemplified, under the specified test conditions, that is, the specified carbon layer height, the gas flow rate, the adsorption temperature, the measured tube cross-sectional area, Under the condition of carbon tetrachloride vapor concentration, the mixed air stream containing a certain concentration of carbon tetrachloride vapor continuously passes through the activated carbon. When the adsorption saturation is reached, the mass of carbon tetrachloride adsorbed by the activated carbon sample and the sample quality The percentage is taken as the adsorption rate of carbon tetrachloride. For the adsorption capacity in activated carbon applications, it is best to use the actual activated carbon, operating conditions, and specific treatments for evaluation. The amount of adsorption of activated carbon, that is, the amount of adsorbate adsorbed per unit of activated carbon, is also known as the activity of activated carbon in the industry. There are two ways to express the activity: Static activity - the amount of adsorption that is generally referred to as the equilibrium of the adsorbent. Dynamic activity---- means that the fluid mixture passes through the bed of activated carbon, in which the adsorbate is adsorbed. After some time of operation, the fluid flowing out of the activated carbon bed begins to contain a certain amount of adsorbate, indicating that the activated carbon bed loses its adsorption capacity. The amount of adsorbate adsorbed on the activated carbon at this time is called the activity of activated carbon. It is the data needed to design a large number of frequent, important adsorption systems. Coconut shell activated carbon should pay attention to what should be paid during the freight 1. The coconut shell activated carbon is prevented from being mixed with hard materials during transportation. It is not allowed to step on or step on to prevent the carbon particles from breaking and affecting the quality. 2. Storage should be stored in porous adsorbent, so water immersion should be absolutely prevented during transportation, storage and use. After water immersion, a large amount of water is filled with active voids, making it useless. 3, to prevent tar substances in the use process, should prohibit the tar substances into the activated carbon bed, so as not to block the activated carbon gap, so that it loses its adsorption. It is best to have a decoking device to purify the gas. 4. When the fire-activated activated carbon is stored or transported, it should be prevented from direct contact with the fire source to prevent oxygen from entering the fire and regeneration when the activated carbon is regenerated. The steam must be cooled to below 80 °C after regeneration. Otherwise, the temperature is high and oxygen is encountered. Activated carbon spontaneous combustion. Power plant water often comes from surface water, groundwater, coastal areas and areas lacking fresh water. Water is often used as a supplementary water source. These waters must be treated by high-purity water equipment such as sedimentation, filtration, desalination and degassing. The equipment can be processed before entering the water circulation system of the power plant. The water vapor circulation system of the activated carbon thermal power plant has strict water quality requirements for the water as the working medium and the cooling medium of the thermal system. For example, the high-pressure boiler feed water requires not only low hardness, but also extremely small dissolved oxygen, solid content and organic matter content. Water that does not meet the water supply standard will make the power plant equipment unable to operate safely and economically. The reverse osmosis desalination treatment system, double bed, mixed bed ion exchange high purity water system ultrapure water treatment equipment, etc. are needed to treat the super high pressure boiler feed water of the thermal power plant. To this end, quality indicators for various water uses in thermal power plants have been developed. It is best used when using activated carbon in coconut shell high iodine value activated carbon, fruit shell water purification activated carbon, softened water quality, softening and demineralizing equipment, ultrapure water treatment equipment, seawater desalination equipment, and high purity water equipment. The function of open circulating water and closed circulating water is the same, and cooling water is supplied to the condenser and auxiliary machinery of the steam turbine. Unlike closed circulating water, open circulating water does not require a dedicated cooling tower. Usually, open circulating hydropower plants are located near the Dajiang River, and the cooling water is taken from the big rivers and discharged to the big rivers. Activated carbon is often used to adsorb molecules, and adsorption determines the applicability, while adsorption is related to the pore size distribution of various carbon types. Take the steam-activated peat-based, lignite-based and coconut-shell-based powdered activated carbon as examples: Peat-based activated carbon has micropores and mesopores for a variety of applications; The lignite-based carbon material has more mesopores and a larger mesopores, providing excellent accessibility; The coconut shell-based carbon is mainly microporous and is only suitable for low molecular removal. Chemically activated activated carbon is very porous, mostly in the microporous and mesoporous range, however, compared to water vapor activated activated carbon, chemically activated activated carbon has a less hydrophobic surface and more negative charge. Take extruded and broken granular activated carbon as an example: Peat-based extruded activated carbon can be made into a variety of different pore size distribution varieties. Microporous-based varieties are mainly used for gold recovery in gas phase applications. Most of the microporous and mesoporous varieties are used in liquid phase applications, such as adsorption of small molecules and macromolecular impurities in water purification. Broken coal-based carbon combines micropores and mesopores for a variety of applications. The lignite-based or coconut-shell-based granular activated carbon has the same microporous and mesoporous structure as the powdered charcoal. What are the performance indicators of activated carbon? The performance indicators of activated carbon products can be divided into physical performance indicators, chemical performance indicators, and adsorption performance indicators. Three performance indicators play a very important role in the selection and application of activated carbon. The main physical performance indicators are: shape, appearance, specific surface area, pore volume, specific gravity, mesh number, particle size, wear resistance, and floating rate. The main chemical performance indicators are: PH value, ash, moisture, ignition point, uncarbide, sulfide, chloride, cyanide, sulfate, acid soluble, alcohol soluble, iron content, zinc content, lead content, arsenic content, Calcium and magnesium content, heavy metal content, phosphate, etc.
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