SU1178473A1 - Apparatus for wet cleaning of gas - Google Patents

Abstract

1. DEVICE FOR WET GAS CLEANING, comprising a housing with. gas and liquid inlet and outlet nozzles, a contact plate made with holes, a separating device consisting of a conical plate and a contact nozzle with a cross section decreasing along the gas course, equipped with profiled blades, a conical-cylindrical insert, an annular partition characterized by that, in order to intensify the mass transfer process by increasing the contact surface of the gas with a liquid, ensuring stable operation with variables 178473

Description

This invention relates to a technique for wet gas cleaning and can be used in chemical and other fields of application. The purpose of the invention is to intensify the mass-exchange process by increasing the gas-liquid contact surface, ensuring stable operation at variable gas loads and reducing the hydraulic resistance. On fng. 1 schematically shows a device for wet gas cleaning, a longitudinal section; in fig. .2 - permit LA in FIG. one; FIG. 3 shows a section in FIG. 1. A device for wet gas cleaning contains a cylidrichse Kdpnyc 1 contact plate 2 of the failing type with openings and redirected visors installed at the holes on the periphery of the plate 2, a separation device consisting of a conical plate 3 and a contact pipe 4, filled in the form of truncated cones of the decreasing diameter, the profiled blades 5, installed in the annular gap between the truncated cones, and the straight blades 6, located between the lower truncated cone and the nozzle 7 of the two-phase input from the contact nozzle 4 and directed at an angle of 40-45 to the horizontal. The nozzle 7 of the contact nozzle 4 is offset from the central axis of the device by 0.05-0.06 of its diameter. The contact nozzle 4 contains a regulating body 8, which is a glass with tangential channels 9 in the form of longitudinal slits. The device is also provided with a conical-cylindrical insert 10, a multi-mesh screen annular partition 11, nozzles 12 and 13 for inlet and outlet of a liquid. And a nozzle 14 for evacuating gas. Device for wet cleaning ha works as follows. The liquid phase through the pipe 12 enters the plate 2, where it interacts with the dusty gas stream. The direction of the gas stream is formed as follows. Gas is introduced through the holes with the diverting caps of the contact plate 2 at an angle into the liquid layer towards the central part, where it meets with the main gas flow entering through the holes of the central part of the plate and having a higher velocity. A part of the formed gas flow, capturing a finely dispersed liquid phase, is directed through the nozzle 7 to introduce a two-phase flow into the contact nozzle, made in the form of truncated cones, and forms a direct gas-liquid jet. Another part of the flow, directed by straight blades 6 located at an angle of 40-45 to the horizontal, forms a swirling jet. As a result of the interaction of the swirling peripheral and jet axial flow, a self-oscillation process occurs in the annular nozzle, which is manifested in the following. The axial flow, which is twisted as it moves along with a peripheral vortex, deviates from the axis and performs a regular procession movement around it. In this case, the boundaries of the peripheral vortex periodically deform, and intensively pulsations of velocity and pressure occur in it. The gas-liquid flow passes through the annular space formed by the lower truncated cone of the contact nozzle 4 and the nozzle 7 directed by the main blades 5 acquires centrifugal rotation. At the same time, its liquid phase in the form of a fan-shaped film is dropped to the surface of the annular mesh partition 11, penetrating through it, settles on the inner wall of the housing 1, through which it flows to the bottom of the plate 3 and is discharged through the nozzle 13. The gas phase is removed from the apparatus through the nozzle 14. As the gas load increases, regulator 8 moves through the smaller base of the upper truncated cone of the contact pipe and the gas-liquid flow passes through its tangential channels 9, made in the form of longitudinal slots. Thus, a constant gas-liquid flow rate is maintained in the contact pipe 4 and the annular space. With a sharp 3-drop in gas load, the proposed device can go from the pneumatic conveying mode to the / failure mode of the fluid, due to the large living ce4efmio holes in the central part of the junction plate 2j, which prevents it from clogging or overgrowing by the solid phase. This indicates that the device operates in a wide range of loads. High gas purification efficiency (99.5%) is achieved by increasing the contact surface of phase II by significantly intensifying mass exchange in a gas-liquid flow achieved as a result of the elements of the contact nozzle in the form of cones of decreasing downstream gas diameter. gas flow along the entire length of the nozzle and the presence of a self-oscillation process due to the displacement of the nozzle 7 relative to the axis of the apparatus by 0.050, 06 of its diameter. When the inlet displacement increases by more than 0.06 of its diameter, the separation of two streams in the contact nozzle becomes abruptly 34, which impairs the mass transfer process. When reducing the displacement of the inlet orifice relative to the axis of the apparatus, the required amplitude of the precessional motion of the axial flow is not achieved, which reduces the efficiency of mass transfer in the gas-liquid flow, as indicated in the table. 1. The most optimal angle of inclination of the rectilinear blades to the horizontal is the angle 40-A5. When the inclination angle decreases, the living section of the apparatus decreases and the hydraulic resistance increases, and at a larger inclination angle of the straight blades, gas flow is broken and the flow is poorly swirled. In tab. Figure 2 presents data proving the presence of a high degree of purification in the proposed angle of inclination of the rectilinear blades to the horizontal. Table 1

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Claims (3)

1. DEVICE FOR WET GAS CLEANING, comprising a housing p. gas and liquid inlet and outlet nozzles, a contact plate made with holes, a separation device consisting of a conical plate and a contact pipe with a section decreasing along the gas, equipped with profiling blades, a conical-cylindrical insert, an annular partition, characterized in that, with the purpose of intensification of the mass transfer process by increasing the surface of the gas-liquid contact, ensuring stable operation under variable gas loads, reducing hydraulic resistance, the contact nozzle is made in the form of truncated cones partially entering into each other with a gap relative to the lateral surface, the profiling blades are placed in the annular gap between the cones, the device is equipped with a nozzle. two-phase flow inlet located at the inlet of the contact nozzle and rectilinear blades located between the lower cone contact pipe and pipe · input two-phase flow, while the upper cone of the contact pipe is equipped with a regulatory body, made in the form of a glass channels and installed with the possibility of movement, and the input pipe of the two-phase flow is shifted relative to the axis of the apparatus by 0.05-0.06 of its diameter. 2. The device according to claim 1, characterized in that the rectilinear blades are located at an angle of 40-45 ° to the horizontal. 3. The device pop. 1, characterized in that the contact plate is provided with stream-guiding visors installed at the hole in its peripheral part.