Flue gas purification device for spray roasting hydrochloric acid regeneration device

Abstract

The invention provides a flue gas purification device for a spray roasting hydrochloric acid regeneration device. The device comprises a reaction furnace, a first spray tower, a steam-water separator,an absorption tower, a washing tower, a waste acid storage tank, a regenerated acid storage tank, a second spray tower, a venturi scrubber and a dynamic wave scrubber, wherein the first spray tower performs primary absorption on the waste gas of the reaction furnace and then conveys the waste gas to the steam-water separator; after the waste gas is concentrated by the steam-water separator, the waste gas is secondarily absorbed, washed and discharged to a second spray tower through the absorption tower and the washing tower; after being washed by the second spray tower, the flue gas enters the venturi scrubber and the dynamic wave scrubber in sequence for dust absorption twice, so the concentration of iron oxide powder particles in tail gas can be effectively reduced, and the tail gas meets the standard of ultra-low emission; and meanwhile, waste liquid in the device can be effectively utilized, so energy conservation and emission reduction are achieved, resources are recycled, and good application prospects are achieved.

Description

technical field [0001] The invention relates to the technical field of chemical waste gas treatment equipment, in particular to a flue gas purification device used in a spray roasting hydrochloric acid regeneration device. Background technique [0002] In iron and steel, mechanical processing and chemical enterprises, hydrochloric acid with a concentration of 18% is usually used to remove oxidized rust (Fe 2 o 3 ), the waste liquid produced by this treatment method contains HCl, FeCl 2 , FeCl 3 According to the national chemical industry standards, the waste liquid generated by pickling is a hazardous waste, which cannot be discharged arbitrarily and needs to be treated professionally. [0003] At present, the common treatment process for this kind of waste liquid is the spray roasting regeneration method. The basic principle of this process is that after the waste acid is concentrated, it is atomized in the reaction furnace and then roasted. After high-temperature roasti...

AI Technical Summary

Problems solved by technology

[0004] In recent years, with the increasingly stringent environmental protection requirements of the country, localities, and enterprises, it is difficult for the flue gas discharged after conventional treatment to meet the standards, especially the micron-level Fe 2 o 3 Particles, the prior art usually uses a Venturi scrubber to remove Fe in the tail gas 2 o 3 Particles are removed, in order to improve the Venturi scrubber for Fe with smaller particle size 2 o 3 The absorption capacity of particles not only needs to increase the pressure drop of the Venturi scrubber, but also needs to continuously discharge waste water to update the water quality inside the equipment. This treatment method will not only greatly increase the production cost, but also does not meet the energy-saving and emission-reduction goals advocated by the state. idea

Images