SU1784260A1 - Gas refining device - Google Patents

Description

The invention relates to a device for cleaning gases from sulfur oxides and can be used in the chemical industry, ferrous and non-ferrous metallurgy and energy. \: /

A device for cleaning gases, including a confuser, diffuser, is known. nozzle and droplet separator, where a cylindrical chamber is installed on the outside of the diffuser, the wall of which is connected to the wall of the confuser in the upper part and the diffuser inlet is introduced into the inlet of the confuser, the nozzle is installed in the narrowed part of the confuser and. It is supplied with a cover.

The disadvantage of this device is the lack of a reaction chamber between the diffuser and the confuser, which eliminates sufficient contact of the gas with the absorbent. With any gas purification, the volume of the absorbent is always less than the volume of the gas, and a small volume of absorbent cannot eject a large volume of gas. In addition, when absorbent gas is trapped, the latter will hit the liquid in the sump, trap moisture and carry it away with the gas. / The closest constructive decision adopted as a prototype. PA, is a horizontal multi-section absorber, consisting of a housing, each section of which includes a Liquid distributor and a swirler installed behind it, after which a separating device is installed that ensures the separation of two gas-liquid phases.

The disadvantage of this device is a large droplet spray of liquid, which, with a strong vortex of gas, is thrown onto the walls of the apparatus before it enters the mass transfer of the absorbent with sulfur, • and the installation of separating devices in each section interferes with the possibility of the adsorbent reacting with sulfur in the subsequent sections.

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1784260 A1 '3

The aim of the invention is to increase the degree of gas purification and the intensification of the sulfur capture reaction, due to finer spraying of the absorbent with compressed air, using a more dispersed slaked emulsion emulsion, which leads to an increase in the area of contact of the absorbent with gas, and the most efficient use of the volume of the absorber. „·>. · 'Yu

This goal is achieved by the fact that the device is equipped with a divider, a diffuser from the gas inlet side and a confuser from the gas outlet side, is also equipped with stationary fixed blades, nozzle assemblies and a moisture trap. To improve the mixing of gases with absorbent material and their uniform contact, the blades are fixed on the inner side of the wall of the cylindrical body, with a gap of 20 to the inner surface and with the formation of a free passage channel in the center of the body after the divider.

In order to equalize the speed of the gas and absorbent moving in parallel, one of the nozzle assemblies is located at the beginning of the diffuser, at the junction of the exhaust fan with the diffuser, where the gas movement slows down, and the nozzle assemblies themselves are connected to the compressed air manifold. thirty

The difference between the device and the known ones is that the use of one or more nozzle assemblies, each of which consists of several nozzles uniformly placed along the cross section of the casing, with fine spraying of the absorbent with compressed air along the gas flow, provides an increase in the gas contact area with the absorbent and this improves the depth and degree of gas purification from sulfur oxides, 40 intensifies the process, and spirally- - placed: the blades inside the casing provide additional mixing of the mass, trapping reaction product (sludge) by the walls of the blades and their removal in 45 collection - oxidizing agent. For the free removal of sludge into the sump, the blades are fixed to the walls of the casing with a gap.

For a more complete capture of moisture 50 from the gas stream, a moisture trap assembly made of hydroxyl soft material is installed at the outlet.

In Fig.1 shows the apparatus, a longitudinal section: in Fig.2-section aa in Fig.1; 55 in FIG. 3 is a section bB in FIG. 1; figure 4 node placement of nozzles and blades.

The device comprises a housing 1, equipped on the gas inlet side with a diffuser 2, connected to the exhaust fan 3, and on the exhaust gas side - a confuser 4. Inside the housing there are nozzle assemblies 5, a divider 6, swirls in the form of spiral blades 7. From the bottom, the housing is equipped with a collector- sludge oxidizer 8, with bubble tubes 9 and with pipes for the removal of sludge 10. constituting the outlet for cleaning products. The device has a dehumidifier, a compressed air supply manifold (not shown).

The housing is placed horizontally, the blades are attached to the housing from the inside radially, at an angle to the horizontal scan line of the housing, with a gap of 11 and the formation of a free passage channel 12. Figure 4 shows the lines of movement of the flue gases 13, and the dispersed mixture of absorbent 14,

The process of cleaning gas from sulfur oxides in the device is as follows. ... „λ.

Flue gases after the electrostatic precipitators are fed into the device of the exhaust fan 3 from the side of the diffuser 2. During a decrease in 25 the gas velocity in the diffuser, it is sprayed with a nozzle unit 5 that finely disperses the dispersed emulsion and, due to the approximation of the gas and absorbent velocities and its dispersion, the contact of these masses improves, which improves degree of sulfur capture. To improve the mixing of the masses during the further movement along the path of movement, a blade device is installed that allows you to cut the flow of the mixture 35 by the divider 6 and directs special blades 7, on which, due to the swirling of the flow, the reaction products (CaBOz) and sulfuric anhydride are captured, which are washed off from the blades 7 down into the oxidizer collector 8. To ensure free discharge of the mass from the blades into the bladder collector 7, they are attached to the walls with a gap 11. In case of insufficient supply of the emulsion from the first nozzle assembly 5, installed in the abutment plane of the exhaust fan 3, and the diffuser 2, in the direction of movement of the gas, there may be behind the blade assembly. additional nozzle assemblies 5 are installed, which can also be used to flush sludge from the walls of the housing 1, the confuser of the 4th blade 7.

In the collection-oxidizer 8 due to the additional supply of air through the bubbler pipes 9, the oxidation of desulphurization products takes place, which is discharged through the nozzles 10.

Using the device will allow:

improve the process of gas purification from sulfur oxides, intensify it, provide a deeper, more stable purification at

1784260 6 to maximize the use of the volume of the apparatus, to ensure a more efficient use of the absorbent, thanks to the use of a more dispersed emulsion of calcined slaked lime. More than 5 full use of the internal volume of the device will allow it to be placed more compactly on the site, which gives significant savings in investment and operating costs. 10

Inside the housing 1 there is a blade device with a divider 6, the front part of which extends into the diffuser 2 1/6 - 1/8 of the length of the diffuser 2 and articulated with it (with the divider), stationary 15 attached to the casing of the blade 7. The blades 7 are attached to the inner side of the casing 1 and confuser 4 with a gap of 11.

The need for fastening the blades to the housing 20 with a gap of 11 is caused by the fact that the cylinder of the housing itself and the stationary fixed blades 7 do not rotate, and therefore the reaction products deposited on the blades in the lower part of the cylinder, in the absence of 25 clearance, will not merge down and be removed. In order for these products to merge down, the blades are attached to the casing with a gap. . Clearance> can be set depending on the consistency of the product from 3 to 5 cm. 30 In length, these blades can be fixed in 1-1.2 m (according to the calculation of the strength of their fastening). When designing the apparatus, it may be necessary to connect around. Post the inner edges of the blades for their 35 stability and strength. The need for spiral placement of the blades inside the device is caused by the need to create a turbulent rotating gas movement, providing additional mixing of the mixture and trapping absorption products on the walls of the blades. Turbulence is ensured by that. that with a blade width of 1/41/6 of the case diameter, only peripheral layers of gases are twisted, which are mixed with gases passing in the center. Thus, mixing occurs while ensuring minimal resistance (it should be noted that the process is provided not by rotation of the blades, but by the kinetic energy of the gas). The curvature of the installation of the blades is determined from the condition of smooth swirling of the flow with a minimum of resistance. In the attached scan, it can be determined in the size from 2 - 3 ° for every 4 m of length, which corresponds to the radius of curvature of the line of contact of the blades to the casing 100120 m. The horizontal position of the apparatus is mainly due to its more convenient design, ease of removal of absorption products and more free the movement of gases, without turns. Although, in principle, it can be installed vertically.

It is possible to work out specific ratios of the parameters of the diffuser, confuser, and casing only with significant tolerances, since they depend on a number of specific conditions and can be determined during the concrete design of the apparatus. For example, the length of the diffuser is 0.8-1.02d, the confuser 1.2d and the cylindrical part 4-4.5d (where d is the diameter of the cylinder).

Claims (3)

Claim 1. A device for cleaning gases, containing a horizontal cylindrical body with an inlet pipe, moisture traps, nozzle units for irrigation, a unit for outputting cleaning products, swirlers, and so on, in order to intensify the process of sulfur absorption, the casing is equipped with a divider, a diffuser on the inlet pipe side and a confuser at the outlet, while the swirls are made in the form of spiral blades attached radially to the inner surface at an angle to the horizontal scan line of the casing, and with a gap X of the latter y and with the formation of a free passage channel in the center of the housing, after the divider. 2. The device according to claim 1, the clause is that it is equipped with a smoke exhauster in communication with the diffuser, and the nozzle irrigation units are placed in the plane of their adjacency. 3. The device according to claims 1 and 2, which includes the fact that it is equipped with a compressed air supply manifold connected to nozzles of the irrigation units. Phil ¹ !