A flue gas treatment device based on low temperature gas separation

Abstract

The invention discloses a flue gas treatment device based on low temperature gas separation. The process includes a spray cooling tower for pre-cooling the flue gas and washing the solid particles in the flue gas. The flue gas treated by the cooling tower then enters the partial condenser, and the different gas components in the flue gas are decomposed according to the gas condensation temperature. For phase change separation, the cooling capacity required by the partial condenser comes from the Brayton refrigeration cycle with nitrogen as the working medium. The device separates different gas components in the flue gas by low-temperature condensation, and is characterized by: no chemical reaction in the flue gas separation process, and little corrosion to the equipment; the separated gas can be recycled as a resource, which can generate economic benefits while meeting environmental protection requirements. ; Overcome the problems of high energy consumption, low value of by-products, easy corrosion of equipment and low-altitude white smoke emission of traditional wet desulfurization and selective catalytic reduction (SCR) denitration processes.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment, in particular to a flue gas separation device utilizing low temperature condensation. Background technique [0002] The main pollutants contained in the flue gas are oxides of nitrogen and sulfur, so desulfurization and denitrification treatment is required before the flue gas is discharged. At present, the widely used flue gas treatment methods are wet desulfurization and selective catalytic reduction (SCR) denitrification. [0003] The core of the wet desulfurization process is the use of calcium-based compounds with SO 2 The main disadvantages of generating gypsum are high energy consumption and low value of by-products. The high energy consumption is mainly reflected in the need to consume a large amount of water in the desulfurization process, resulting in a large amount of waste of the thermal energy of the flue gas itself during the desulfurization process, and the flue gas te...

AI Technical Summary

Problems solved by technology

[0006] The disadvantages of traditional chemical methods for flue gas treatment are mainly reflected in high energy consumption, low value of by-products, easy corrosion of equipment, high moisture content of flue gas after desulfurization, and white smoke pollution in emissions.

To solve the above problems in the existing flue gas treatment process, using physical methods to condense and recover the flue gas at low temperature is a new way of flue gas treatment

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