Wet spray gas desulphuring devices

Abstract

A wet spraying flue gas desulfurization device relates to the structural design of a wet spraying flue gas desulfurization device. The invention mainly includes a desulfurization tower and a circulation pump and an oxidation blower arranged outside the desulfurization tower. The desulfurization tower is divided into three areas: circulating oxidation zone, scrubbing and absorbing zone and flue gas demisting zone. A spray layer with nozzles is arranged on the upper part of the scrubbing and absorbing zone. Composition, the two ends of the variable-diameter main pipe are thick and the middle is thin, and the variable-diameter branch pipe adopts a structure that changes from thick to thin and then thickens. The device integrates forced oxidation, double variable-diameter spray layer structure and countercurrent wet spray technology into an overall system, which effectively guarantees the atomization quality of droplets, and the droplet coverage in the intersection area can reach 250-300%. When Ca / S is between 1 and 1.15, the flue gas desulfurization rate can be stably realized between 95% and 99%, and the consumption of adsorbent can be saved by 20% to 30% compared with the prior art under the same technical conditions.

Description

Technical field: [0001] The invention relates to a flue gas desulfurization device discharged from combustion equipment, in particular to the structural design of a wet spray flue gas desulfurization device. Background technique: [0002] The characteristic of wet flue gas desulfurization technology is that the entire desulfurization system is located at the end of the flue of the coal-fired boiler and after the dust removal system. at the dew point. [0003] At present, my country's existing wet flue gas desulfurization technology mainly includes two process methods: natural oxidation and forced oxidation. Natural oxidative desulfurization processes include conventional wet desulfurization and granite desulfurization dust collectors, water film desulfurization and dust removal integration, which are widely used in industrial boilers in my country. The conventional wet desulfurization process has no effect on the CaSO in the desulfurization slurry. 3 Forced oxidation, sca...

AI Technical Summary

Problems solved by technology

However, the spray layer of conventional wet desulfurization generally adopts loop feeding, see "Mohn U. Lime / limestonescrubbing.In: Processings of the 1990 SO 2 control symposium, New Orleans, LA, USA, 8-11Nov 1990. EPRI-GS-6963-Vol.3, Palo Alto, CA, USA, Electric Power Research Institute, pp6C.29-6C.51 (Sep 1991)", After feeding, the materials are fed to the branch pipes connected to the nozzles respectively. In actual use, because the pressure balance in front of the nozzles cannot be maintained, the atomization quality of each nozzle is quite different, and there is no stable and efficient desulfurization slurry and flue gas in the entire desulfurization tower. Contact area, which seriously affects the desulfurization efficiency

In order to overcome the above defects, some researchers have proposed a spray layer structure in which the main pipe is fed, and the branch pipe is connected to the nozzle, see "Rahm J. The flue gas desulphurisation at the power plants of B K B using the Wellman-lord process. Paper presented at the ECEworkshop on emission control costs: methodology and example cases, Esslingen and Neckar, Germany, 28 Sep-1 Oct 1987", which partially solved the unavoidable pressure head fluctuation of the loop pipe due to the slurry disturbance formed by the feed slurry circulation, but due to Both the main pipe and the branch pipes adopt constant diameters, but the actual flow rate of the main pipe and branch pipes is variable, which still causes fluctuations in the distribution of the pressure head in front of the nozzle, which in turn affects the atomization quality

Images