SU1446102A1 - Installation for concentrating spent sulfuric acid - Google Patents

Abstract

The invention relates to a plant for the regeneration of spent sulfuric acid and allows an increase in plant productivity. From the furnace 1 to the concentrator 2 of the Venturi pipe type, hot flue gases flow from t 800–900 ° C. There from the pressure tank 6 through the dispenser 7 serves diluted waste When the acid comes into contact with the hot flue gases, spraying and evaporation occur. Acid droplets from the gas stream are allocated in the first cyclone 3 and then in the mist eliminator 4. Dilute spent acid is fed to the latter. The acid droplets are separated from the gas in the cyclone 5, from where the liquid flows into the concentrator 2. Sulfuric acid from cyclone 3 enters the flow divider of acid 9. Part of the acid from divider 9 goes through the pipeline to the throat of the concentrator 2 of the Venturi due to a vacuum in the throat. The stripped sulfuric acid from the splitter .9 is sent to the acid cooler 8. The presence of an acid flow divider connected to the venturi throat allows recycling of the acid through the concentrator. 1 il. Kis vvu with S CL 4 4 a

Description

The invention relates to installations for the regeneration of waste sulfuric acid containing organic impurities,

The aim of the invention is to understand the performance of the plant by reducing the loss of sulfuric acid.

The drawing shows a plant for concentrating waste sulfuric acid containing organic impurities.

The installation includes a furnace 1, a centrifugal 2 Venturi-type pipe, the first cyclone 3, a Venturi-type mist eliminator 4, a second cyclone 5, a pressure tank 6, an acid dispenser 7, an acid cooler 8, a divider 9 stream of sulfuric acid equipped with a fitting 10.

I. .

The acid in the divider 9 thread

connected to the first cyclone 3. One of the acid outlets from the splitter 9 of the flow is connected to the throat of a Venturi-type concentrator 2, the second output to an acid cooler 8. The pipeline connecting the splitter 9 to the throat of a Venturi-type 2 concentrator is submerged under an acid layer in the stream divider 9 provided with a nozzle 10 for discharging acidic isham.

The installation works as follows.

Hot flue gases at 800–900 ° C flow from the furnace 1 to the Venturi type 2 concentrator. The diluted spent sulfuric acid from the pressure tank 6 is fed to the concentrator through the acid dispenser 7, and sulfuric acid from the second cyclone 5. In contact with hot flue gases in the throat of the condenser of the centralizer of the 2nd type of the venturi tube, acid spraying and evaporation takes place. Acid droplets are released from the gas stream in the first cyclone 3, and the vapor-gas mixture is sent to a Venturi-type mist eliminator 4, where the diluted waste sulfuric acid from the pressure tank 6 is fed through the acid dispenser 7. Acid droplets are separated from the gas in the cyclone 5, from where the liquid flows

in the hub 2. Gas from the cyclone 5

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five . 0

50

0 s

five

0

five

enters the waste gas treatment department.

Sulfuric acid from cyclone 3 is fed into the splitter 9 of the acid flow, part of the acid from which is fed through the pipeline to the throat of a concentrator of the 2nd type of Venturi tube due to the vacuum in the throat. The stripped sulfuric acid from the splitter 9 of the stream is sent to the acid cooler 8 and further to the warehouse. Acid-containing solid particles are precipitated in the flow divider 9 and periodically removed as acid slurry through nozzle 10.

The presence in the plant of a separator for the flow of the heart acid associated with the throat of the venturi provides the possibility of recycling the acid through the concentrator. Recycling an acid leads to an increase in its massive rate and an increase in the size of acid droplets, which reduces the rate of their warm-up and helps to slow down the process of coking organic impurities contained in the acid. This leads to a decrease in the degree of decomposition of sulfuric acid to sulfur dioxide by a factor of 1.8–2, thereby providing an increase in plant productivity by 10–15% by reducing the loss of sulfuric acid and reducing the environmental pollution by sulfur-containing waste.

Claims (1)

Invention Formula A plant for concentrating spent sulfuric acid containing organic impurities, including a firebox, a Venturi-type concentrator, a first cyclone, a Venturi-type mist eliminator, a second cyclone, a pressure tank, an acid metering unit and an acid cooler, so that plant performance by reducing the loss of sulfuric acid, the plant is equipped with a sulfuric acid flow divider, which is connected to the first cyclone, to the acid cooler and to the neck of the concentrator oprovoda immersed under the acid layer in the flow divider.