Activated charcoal gas cleaning method and device thereof

Abstract

The invention provides an active coke gas purifying method and a device thereof with high desulfurization and denitrification efficiency, energy conservation, little resistance of a bed layer, high utilization rate of the space in an absorption tower and low construction cost. The device comprises a main feed inlet and a gas main outlet which are arranged at the upper part of the absorption tower, a main discharge outlet and a gas main inlet which are arranged at the lower part of the absorption tower and an active coke bed layer which is positioned in the absorption tower, and the active coke bed layer is tilted and has an included angle Alpha with the vertical line. The method has the following steps: gas enters the active code bed layer from the gas main inlet, gas in the tilted bed layer is flowed to the top from the bottom; active coke simultaneously enters the active coke bed layer from the main feed inlet, the active coke in the tilted bed layer is flowed to the bottom from the top; the gas is exhausted from the gas main outlet after the fully tilted convection contact is formed between the gas and the active coke, and the active coke after the saturation by absorption can be discharged from the main discharge outlet.

Description

Technical field [0001] The invention relates to a method and device for purifying activated coke gas. Background technique [0002] Activated coke dry desulfurization and denitrification technology are often used in the purification of flue gas from industrial coal-fired boilers, and also in the purification of gas in absorption towers in the fields of chemical industry, metallurgy, glass, and pharmaceuticals. [0003] <Development of activated coke desulfurization technology> [0004] Activated coke desulfurization technology is a dry desulfurization and denitration technology developed in the 1960s and based on the principle of physical-chemical adsorption. It has the advantages of large adsorption capacity, fast adsorption process and fast catalytic conversion. The activated coke that has adsorbed sulfur dioxide can be reused after regeneration. The regenerated sulfur dioxide can also be made into by-products such as sulfuric acid, liquid sulfur dioxide or elemental sulf...

AI Technical Summary

Problems solved by technology

Disadvantages: The flue gas enters the activated coke bed from the side, the activated coke near the flue gas inlet first undergoes adsorption reaction and reaches saturation first, the flue gas moves from left to right, the adsorption saturation of activated coke decreases in turn, the overall distribution The adsorption saturation of activated coke decreases from left to right, and increases from top to bottom. The adsorption of activated coke on the side near the flue gas outlet is less, so that some of the activated coke discharged is not fully adsorbed. In this way, part of the fresh active coke is discharged and sent for regeneration, so that the circulation of active coke is increased, and the increase of circulation also increases the power consumption and damage, and the amount of regeneration gas increases, resulting in Energy is wasted. In addition, due to the large saturation of the activated coke in the lower part, the desulfurization efficiency is low. The upper active coke is relatively fresh, so the desulfurization efficiency is higher, and the total desulfurization and denitrification efficiency of the gas outlet is the average of the efficiencies of the upper and lower positions. value, so its desulfurization and denitrification efficiency is not as high as that of convective adsorption

The disadvantages are: since the flue gas enters the absorption tower at the bottom, the air intake area is small, the air velocity in the tower is high, and the bed resistance is large. , Active coke lower silo, so the space utilization rate in the convection absorption tower is low

For example, to build an adsorption equipment with an adsorption capacity of 2.2 million standard cubic meters of flue gas, the construction cost of using convective adsorption technology is about 420 million yuan, and the construction cost of using cross-flow adsorption technology is about 208 million yuan

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