SU1729560A1 - Device for cleaning gasses of sulfur oxide - Google Patents

Abstract

The invention relates to devices for the purification of gases from sulfur dioxide and can be used in the chemical industry, ferrous and nonferrous metallurgy, heat and power engineering and is an improvement of the a.s. No. 1599067 and allows to increase the degree of gas purification by reducing the penetration of the crude gas into the purified stream. The device includes a housing with connections for inlet and outlet of the gas flow and the absorbent, as well as sections filled with the nozzle, which are inclined along the gas flow at an angle of 15-35 ° amp; To the horizon and in the intermediate chambers between the individual sections, plates are installed, which rotate the gas flow around the axis of movement in front of each subsequent section. The sections filled with the nozzle are rotatable around a horizontal axis, perpendicular to the gas flow. The side walls of the section are made with staggered holes, successively overlapping in height by an amount b equal to 7-12 h, where h is the size of the nozzle element, with a distance between holes C equal to 2-4 h equal to 2-4 h and their height -. H -200 + b (n -1) I, p where H is the section height, n is the number of holes, equal to: D D-200 + C P a + c where D is the section width. 3 il.

Description

The invention relates to devices for the purification of gases from sulfur dioxide and can be used in the chemical industry, non-ferrous and ferrous metallurgy, heat and power engineering and is an improvement of the known device described above. No. 1599067.

The known device for the purification of gases from sulfur oxides contains a horizontal body with inlet and outlet branch pipes, divided into sections installed at an angle of 15-35 ° to the horizontal and filled

a nozzle, between which there are means for the distribution of gases, made in the form of inclined plates.

A disadvantage of this device is a reduction in the degree of gas purification from sulfur oxides due to the penetration of the crude gas into the gaps between the side walls of the sections and the device body, followed by mixing with the purified gas.

The purpose of the invention is to increase the degree of gas purification by reducing the penetration of the crude gas into the purified stream.

This goal is achieved by the fact that in a device for purification of gases from sulfur oxides, containing a horizontal body with inlet and outlet nozzles, divided into sections installed at an angle of 15-35 ° to the horizontal and filled with a nozzle, between which are means for distributing gases, made in the form of inclined plates, the side walls of the section, made with stepped openings, successively overlapping in height by an amount b, equal to: 7-12 n, where h is the size of the landing element, with a distance between for holes C, equal to: 2-4 h, the width of which is A, is equal to 2-4 and their height

, H -200 + b (n -1)

The device includes a horizontal body 1 with connections for supplying 2 and exhaust 3 gas. In the housing there is an absorption zone formed by perforated sections 4 filled with nozzle 5 installed at an angle of 15-35 ° to the horizon with an inclination along the gas flow. In the upper part of the contact zone are the nozzles 6, and in the lower part - the chute 7 for removal

saturated liquid through pipes 8. Before the second and subsequent sections, gas flow turning plates 9 are installed.

Between the housing 1 and section 4 - the gap 10.

In the side walls 11 of section 4, holes are made, staggered and overlapping in height by an amount B equal to 7-12 h, aperture width A is 2-4 h, the distance between holes C,

equal to: 2-4 h, the height of the hole is determined by the formula

where N is the height of the section, mm;

b - the height of the overlap of the holes, mm; n is the number of holes equal to

D - 200 + C

a + c

where D is the width of the section, mm

The difference of the proposed device is that the side walls of the section are made with openings that are staggered and successively overlap in height by an amount B equal to 7-12 h. At the same time, an absorbent gets into the gaps between the casing and the side walls of the sections through the holes in the side walls, which contact with the raw gas leaked into the gaps, cleaning it, and thus increasing the degree of purification of the entire gas stream.

The stepwise arrangement of the holes with overlap in height allows the absorbent to be evenly introduced into the gaps, which prevents leakage of the raw gas into the purified stream. The dimensions of the hole and their mutual arrangement are chosen in accordance with the size of the nozzle and taking into account the possibility of a more complete interaction of the gas with the absorbent. A reduction in these dimensions leads to a decrease in the degree of purification. Increasing the size of the holes and reducing the distance between them leads to a decrease in the rigidity of the section design.

1, a gas cleaning device, longitudinal section; figure 2 - section aa in figure 1; on fig.Z section bb of figure 2.

25

 H -200 + b (n -1) n

where N is the height of the section, mm;

b - the height of the overlap of the holes, mm; n is the number of holes equal to

thirty

P

D-200 + C

a + c

where D is the width of the section, mm.

In both formulas, the value 200 is the tolerance for deviation from the edge of the wall of the section to the hole.

The device works as follows.

When the sections 4 are filled with the nozzle 5, the elements of the nozzle 13 fall into the holes, contacting the side walls of the housing 12. The elements of the nozzle 13 do not fall into the gap 10, since the size of the nozzle is larger than the width of the gap. The mobility of the section relative to the housing 1 is maintained.

The liquid enters through the nozzles 6 and, sprayed onto the droplets, falls on the upper part of the nozzle 5. Due to the developed surface of the nozzle, an intensive contact of the gas with the liquid film occurs.

When the liquid flows through the nozzle, a part of the liquid enters the hole and as a result of accumulation of droplets on the surfaces of the nozzle elements in the grooves, droplets are formed that open and fall into the gap 10, creating an absorption region there.

At the same time, the unrefined gas entering the gap either passes through the gas

If there are elements of the nozzle, it is in intensive contact with a film of liquid on their surface, or it passes through the channels 13 between the holes with the nozzle and interacts with drops of the reagent there. Moreover, due to the oncoming movement of the liquid and gas, the drop of the absorbent with the gas flow is reduced.

It was established experimentally that with the following hole sizes: width А 2-4 h, overlap step height - b 7-12 h, distance between holes - С 2-4 h, where h is the size of the nozzle element, gas cleaning depth is increasing.

At a 2h, b 7h, c 4h, the gas entering the gap does not have time to fully interact with the reagent, which leads to the ingress of the crude gas into the purified stream. With,, with 2h the rigidity of the structure is violated.

PRI me R. At the bench installation, with a 1000 mm xUOO mm cross section, three sections were installed with side walls made with stepped holes, successively in height, filled with rashig rings with varying angle to the horizon along the gas flow. Waste gases containing 0.3% sulfur dioxide with a temperature of 70 ° C were fed to the plant. The nozzles were irrigated with an alkaline solution of NaOH, with a concentration of 0.05-0.1% with a flow rate of 100 l / h. The data of the experiment are given in the table.

Nozzle: Raschig rings - 10 x 10 x 1.5, h 1 mm; Section: 950-950-500 mm; H 950 mm; 0 500 mm.

Characteristic of holes: width a 2h 20 mm; height of the overlap of the holes b 7h 140 mm; hole width with 2h 20 mm; number of holes

GR-200 + cl P

hole height

G500-200 + 20

20 + 20

 H -200 + s (p -1)

ten

950-200 + 140-7 8

216mm.

The proposed device, in comparison with the prototype, improves the degree of gas purification, since the passage through the gaps between the sections and the raw gas body is prevented.

Claims (1)

The invention The device for the purification of gases from sulfur oxides, according to ed. Mg 1599067, characterized in that, in order to increase the degree of gas purification by reducing the penetration of the crude gas into the purified stream, the side walls of the section are made with stepped holes, successively overlapping in height by an amount b 7-12 h, where h is the size the nozzle element with a distance between the holes C 2-4 h, the width of which is 2-4 h and their height I H -200 + b (n -1) n thirty 35 where H is the height of the section; P D-200 + cl a + c J number of 40 versions, where D is the width of the section. t go