Flue gas dust removal desulphurization system of double-circulation Venturi rod tower

Abstract

The invention belongs to the field of environment protection, and discloses a wet-method flue gas dust removal desulphurization system of a double-circulation Venturi rod tower. The system comprises an adsorption-liquid supplying unit, a flue-gas purification unit and an adsorption-liquid postprocessing unit. The flue-gas purification unit comprises an upper Venturi rod tower section, a lower Venturi rod tower section, a shutter-type separation cone separating the upper Venturi rod tower section and the lower Venturi rod tower section, an upper circulation liquid pool, a lower circulation liquid pool, upper circulation-liquid sprayers, lower circulation-liquid sprayers, and demisters. Flue gas in the upper tower section and flue gas in the lower tower section are in series connection. A circulation-liquid spraying system is operated independently. Dust removal and desulphurization are separately optimized and performed. The "homogenization" gas flow distribution, "gas in liquid" efficient mass transfer, highly-turbulent "self-cleaning", and other effects of Venturi rod layers are fully utilized by the system so as to perform efficient cooling, dust removal desulphurization of the flue gas. The system is advantages by high dust removal desulphurization efficiency, low operation liquid gas ratio, small resistance, less scale, small occupation area, low investment, low operation energy consumption, less discharge of high-salt water, and the like, and is suitable for dust removal and desulphurization for various kinds of flue gas, particularly suitable for processing of high-temperature high-dust high-sulfur flue gas such as regenerated flue gas of a petroleum catalytic cracking device.

Description

technical field [0001] The invention relates to an integrated flue gas dust removal and desulfurization treatment technology, in particular to a double-cycle Venturi rod tower dust removal and desulfurization system. Background technique [0002] Wet flue gas desulfurization and dust removal are the main means of controlling the emission of dust, sulfur dioxide and nitrogen oxides in industrial furnaces. According to the classification of desulfurizers used, the commonly used processes include limestone / lime-gypsum method, magnesium method, sodium method, double alkali method, ammonia method, etc., and they have become increasingly mature. From the perspective of equipment, the biggest difference between various wet flue gas desulfurization processes is mainly in the gas-liquid contact desulfurization tower. The same gas-liquid contact tower can be used for the wet desulfurization process of various desulfurizers, and vice versa. The gas-liquid contact desulfurization towe...

AI Technical Summary

Problems solved by technology

[0005] However, there are still some defects in the existing Venturi rod tower system, which affects its dust removal and desulfurization efficiency and the full play of the advantages of the Venturi rod tower

For example, the existing Venturi rod towers basically operate in a single cycle of washing and absorbing liquid, and the cooling, dust removal and desulfurization are in the same tower space, which produces the following defects: (1) There is lye in the gray water, which affects the ash and slag Reuse and reduce the utilization rate of desulfurization agent; (2) There is smoke and dust mixed in the desulfurization product, which affects the recovery and reuse of desulfurization product; (3) The absorption liquid interacts with high-temperature flue gas, and the desulfurization reaction is not in the best condition, so the desulfurization efficiency Not ideal; (4) The amount of dust in the circulating slurry is large, which increases the abrasion and blockage of circulating pumps, pipelines, nozzles, etc.

Obviously, these two patents have basically overcome the main defects of the single-cycle flue gas desulfurization system, but they have added problems such as complex structure, risk of fouling and large increase in gas resistance.

Images