RU2091136C1 - Magnetic mass-exchange apparatus - Google Patents

Abstract

FIELD: gas cleaning in metallurgical, chemical, etc. SUBSTANCE: proposed apparatus is constituted by Venturi scrubber comprising deflector-drip pan. Latter is provided on its inner side with magnetic blocks adapted to generate high-energy magnetic fields. As is common knowledge, efficiency of wet scrubbers depends on two factors: firstly, on gas flow velocity through active section of scrubber, and, secondly, on specific consumption of liquid used to irrigate gas. Proprietary design of proposed apparatus makes it possible to vary both of these factors independently from one another, thereby creating any suitable hydrodynamic conditions for interacting phases. Apparatus can be used for neutralizing toxic gases, for cooling, absorption and dedusting of off-gases resulting from metallurgical, chemical and other industries. Apparatus can be used for carrying out heat- and mass-exchange processes in gas-liquid system. EFFECT: apparatus is multi-purpose one, since it can be used to carry out any heat- and mass-exchange processes; it is money-saving, since it necessitates low liquid consumption due to its multiple re-uses. 3 cl, 2 dwg

Description

 The invention relates to the field of neutralization of toxic gases and can find application for cooling, absorption and dust removal of exhaust gases from metallurgical, chemical and other industries, as well as for carrying out technological heat and mass transfer processes in a gas-liquid system.

 Known heat and mass transfer apparatus in the form of a venturi, having a deflector-droplet eliminator and cone fairing, regulating the cross section of the neck of the venturi.

 In this apparatus, liquid enters the confuser, a diffuser immersed in the liquid, and picks up liquid droplets that are separated from the gas stream in the deflector-droplet eliminator.

 A disadvantage of the known design is the large gas and dust droplets. This drawback is eliminated by the introduction of high energy magnetic systems.

 Figure 1 presents a General view of the mass transfer apparatus; in FIG. 2-layout of the magnetic blocks.

 The mass transfer apparatus includes a housing 1, a Venturi pipe located in it, including a gas chamber 2 in the form of a hollow pipe, at the bottom passing into a confuser 3, a neck 4, a diffuser 5, a liquid nozzle 6 for supplying makeup liquid, a conical fairing 7, the rod 8 of which connected to a lifting device 9. The apparatus has a gas duct 10 for venting gases in the upper part, and in the lower part, a louvre deflector-droplet eliminator 11 with magnetic blocks 12 and a water trap 13.

 Magnetic blocks 12 (see figure 2) are fixed on the inner side of the deflector-droplet eliminator 11 at a distance L, providing a magnetic field strength of 100 oersteds, using sleeves 14.

 The device operates as follows.

 Hot dusty gases from open-hearth, converter or chemical plants are introduced coaxially or tangentially into the gas chamber 2 through the inlet gas duct, in which, due to inertial or centrifugal effects, respectively, large (more than 5 μm) dust fractions are deposited. Then the gases previously cleaned in this way enter the contacting elements of the Venturi pipe, the confuser 3, the neck 4 and the diffuser 5, partially immersed in the irrigation liquid. Due to the ejecting action of the high-speed gas jet through the gap between the confuser 3 and the lower part of the chamber 2, a liquid enters the venturi for gas irrigation, the specific flow rate of which is controlled by changing the position of the venturi through the rod 8 using device 9. The gas-liquid flow rate is controlled by moving the cone fairing 7 s using a lifting device 9 through the rod 8.

This design allows you to flexibly change the parameters of the gas-liquid flow in the active section: the gas velocity in the range of 20-150 m / s and above, the specific flow rate of the irrigation fluid in the range of 10 l / m ^{3 of} gas and above, and thus change the value of the coefficient of gas and dust and mass transfer.

 Due to the intensive mixing of gas and liquid in the venturi, a heterophasic gas-liquid emulsion is formed with a highly developed active phase contact surface. Then, the phases are separated: the purified and cooled gas passes through the louvre deflector-droplet eliminator 11 with magnetic blocks 12 and is removed from the apparatus through the exhaust gas duct 11, the spent liquid is returned to the recirculation cycle and, thus, is repeatedly used in the heat exchange process.

 The fluid is updated continuously or periodically through the nozzle 6 of the fluid inlet: the spent fluid is removed through a water trap 13 and then sent for cooling, settling or desorption. Sludge is removed through a water trap 13. Magnetic blocks are placed in the deflector-drop eliminator from the inside at a distance providing a magnetic field strength of 100 oersted between the magnetic blocks, each block has 2-20 magnetic poles with a strength of 5 kiloersteds each. The cone fairing is coated on the outside with powder varnish magnetized up to 5 kiloersted. In this case, the magnetic powder forms spikes with a height of 1-10 mm, arranged in a checkerboard pattern.

 The use of magnetic blocks increases the efficiency of dust and mass transfer processes.

Claims (3)

 1. A mass-exchange apparatus for cleaning gases from dust, made in the form of a Venturi pipe having a deflector-droplet eliminator and a cone fairing, characterized in that the deflector-droplet eliminator from the inside is equipped with magnetic blocks that create high-energy magnetic fields, magnetic blocks are installed at a distance providing a magnetic field of 100 Oe, with each magnetic unit has 2 20 magnetic poles, each 5 kOe.  2. The apparatus according to claim 1, characterized in that the cone fairing is externally coated with varnish with magnetic powder magnetized to 5 kOe.  3. The apparatus according to claim 2, characterized in that the magnetic powder forms spikes with a height of 1 10 mm, arranged in a checkerboard pattern.

Images