RU2022623C1 - Gas scrubbing apparatus - Google Patents

Abstract

FIELD: purification of gases of steam power plants from fly ash. SUBSTANCE: emulsification conditions are created in tubular headpieces of apparatus generated as a result of engagement of twisted flow of impured gas with sprinkling water fed to tubed in bulk in gas counterflow. Flow twisting device is in the form of chamber combining four tubes and looking in plan like as rosette of four semicylinders with four symmetrically positioned holes for tubes. On opposite side surfaced of chamber in places of joint of semicylinders there are two slit holes to receive two counterflows generating four stable vortexes with collision of flows. EFFECT: enhanced operating reliability. 2 cl, 3 dwg

Description

 The invention relates to techniques for wet cleaning of flue gases from solid, liquid and gaseous toxic inclusions and can be used in energy, metallurgy, building materials industry, and other industries.

 For the deep cleaning required by sanitary legislation, two types of dust collectors are currently used - electrostatic precipitators and so-called wet gas scrubbers.

 Known irrigated battery cyclone, composed of parallel mounted cyclone elements combined in one housing and having a common supply and exhaust of gases, as well as a prefabricated hopper with a water seal. The cyclone elements are vertically mounted irrigated nozzle pipes, in the lower part of which are placed scapular swirlers.

 The disadvantage of this device is that the cyclone elements used in it have a sufficiently large diameter (180 mm), and it is not possible to organize a phase inversion mode in them. It has been experimentally established that the maximum diameter of the nozzle, in which it is possible to carry out a phase inversion mode with emulsion filling the entire pipe section, is about 100 mm.

 With increasing diameter, the central part of the cyclone element along the entire axis remains on the filled emulsified mixture. This leads to the exclusion of purification of that part of the dusty gas that passes through the space not filled with emulsion.

 Therefore, the known irrigated cyclones are used as a scrubber with a film motion of water with a low degree of capture of the solid fraction (85-90%).

 In addition, the apparatus has a weak structural element, namely, a blade swirl, which is equipped with each nozzle pipe. The swirlers are exposed to the maximum influence of an aggressive environment and as a result of this their rapid wear occurs.

 The aim of the invention is to increase the reliability of the apparatus for wet cleaning of gases while maintaining high levels of dust collection.

 In FIG. 1 shows a general view of the apparatus; figure 2 is a section aa, bb figure 1; figure 3 is a view along arrow In figure 1.

 The apparatus contains a swirl chamber 1 with two slotted holes 2, emulsion tubes 3, the upper part of which goes into a square section 4, a hole 5 in the swirl chamber for discharging slurry, holes 6 on the cover of the swirl chamber made under each nozzle pipe, a distribution device 7 with four holes for supplying water to each pipe 3; open tray 8 with holes above each device 7.

 Installation works as follows.

 The gas-dust flow enters through two counter-openings 2 into the chamber 1, in which two counter-flows form four stable vortices under each nozzle pipe. These vortices are supported by jets constantly flowing into openings 2. Here, in the vortex formation chamber, partial separation of dust from the gas stream occurs due to centrifugal forces. Due to this, the concentration of suspended matter in the emulsion is reduced and the possible secondary ablation of dust with liquid droplets is minimized.

 On the axis of the vortices on the cover 9 of the chamber 1 there are round openings 6 through which the swirling flow enters the pipes 3, where, upon contact with the irrigation liquid, an emulsion layer is formed and maintained, in which the final gas purification takes place.

 Upstream of the pipe 3 have a diffuser extension, turning into a square section. The latter allows you to maximize the cross-section of the emulsion pipes and reduce the flow rate in their upper part, which minimizes the risk of splashing. Irrigation water flows through the device 7 into each pipe, and is dosed through an opening in the tray 8. An open tray reduces the risk of clogging of the holes and facilitates the task of cleaning them. The discharge formed during the cleaning of the pulp is carried out through the hole 5, located in the zone of maximum static pressure in the chamber 1.

Claims (2)

 1. APPARATUS FOR WET GAS CLEANING, comprising a housing with irrigated nozzle tubes parallel to it, devices for swirling the dust and gas stream, gas supply and exhaust pipes, liquid dispensers installed with the orientation of the outlet openings in the upper part of the pipes, characterized in that, in order to increase the reliability of the apparatus while maintaining high rates of gas purification, devices for swirling gases are made in the form of chambers, on the cover of which there are four symmetrically located openings with a diameter of less e of the internal size of the nozzle pipe and one bottom hole for pulp discharge, while in the plan the chamber has the appearance of a socket of four half-cylinders, in two opposite places of the junction of which there are slotted holes for supplying the dust and gas stream in the form of two oncoming jets, and the nozzle pipes are grouped four and each such group is docked with the swirl chamber with the location of the pipes above the corresponding holes of the chamber.  2. The apparatus according to claim 1, characterized in that, in order to maximize the cross section of the nozzle pipes and reduce the gas flow rate, the upper part of the pipes has a diffuser extension, turning into a square section.

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