SU1322047A1 - Cyclone-type heat exchanger - Google Patents

Abstract

The invention relates to the technique of heat treatment of a mixture of dispersed materials in an environment of high-temperature gases and allows to intensify heat exchange by increasing the relative velocity between the gas and solid phases and updating the interfacial surface. Bumpers 5 of the triangular shape, placed on the inner surface of the body along two helix lines (VL), are arranged in a staggered order in both VLs. At different VL at the ends facing towards each other, the bump stops are equipped with blades 6, bent towards the adjacent VL. As a result of the interaction of the flow of the gas suspension involved in the wave motion with the flow of the gas suspension participating in the movement along the helix, the polydisperse material is actively moving along the wall in the axial direction and in the direction of the main motion of the gas suspension. In addition, as a result of the wave motion of a part of the gas suspension, the average residence time of the polydisperse phase in the apparatus increases. 3 il. (L Yo / khoz purified tep / 10nosi sang b bimd ralydis perssen ipaw (Ji SO gh :) o 4 Yl /

Description

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The invention relates to a technique for the heat treatment of a mixture of dispersed materials in an environment of high-temperature gases and can be used in the engineering, metallurgical, chemical, construction and other industries.

The purpose of the invention is to intensify heat transfer by increasing the relative velocity between the gas and solid phases and renewing the interface.

FIG. 1 shows schematically the proposed heat exchanger; in fig. 2 shows section A-A in FIG. one; in fig. 3 - a fragment of a heat exchanger sweep with baffles and guide vanes.

The cyclone-type heat exchanger comprises a housing 1 with tangential inlet and coaxial outlet pipes 2 and 3, respectively, in the upper part, and in the lower part - pipe 4 for dispersed phase output. On the inner surface of the body there are two spiral rows of chippers 5 triangular pros, w. in such a way that the top row of bumpers are arranged in a checkerboard pattern relative to the bottom row of bumpers. The adjacent ends of the bump stops are equipped with guide vanes 6, bent towards the opposite row of the bump stops.

The heat exchanger operates as follows.

A mixture of polydisperse materials together with the coolant is fed into the casing 1 of the apparatus through tangent 11, and 1; 2 nipple 2. In a rotating coolant flow, material particles are pressed against the walls of casing 1 along which they move along spiral paths, passing a certain number of turns until the process ends heat exchange and removal of the dispersed phase through the pipe 4, and the purified coolant through the pipe 3.

In the dispersed phase, stripped to the walls of the apparatus, due to centrifugal and frictional forces, a negative effect of the separation of the polydisperse phase occurs in the radial, screw and axial directions.

When the dispersed phase and the heat carrier of the triangular-shaped chippers reach, a part of the gas suspension continues to move along a helical line between the rows of the chippers;

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1322047

Part of the gas suspension, moving along the baffle, breaks off from the top of the baffle, as a result of which turbulent eddies arise, which have a predominantly radial orientation. Due to these vortices, there is a partial intensification of the heat exchange process and mixing of the dispersed phase in the radial direction; part of the gas suspension, due to the length of the guide blades at the ends of the bump stops and the chess arrangement of the bumps of the upper row relative to the bumpers of the lower row, acquires a wave-like motion (i.e., the gas of the suspension is guided by the blade from the upper bump stop to the lower and then from

the lower chipper also by the blade - to the next upper chipper, etc.). In this case, the flow of the gas suspension involved in wave motion constantly intersects with the flow involved in the movement along the helical line, as a result of which

active movement of the polydisperse material along the wall in the axial direction and in the direction of the main movement of the gas suspension. In addition, as a result of wave motion along the wall of a part of the gas suspension, the average residence time of the polydisperse phase in the apparatus increases. Also, during a shock fusion of intersecting gas suspension flows, the interfacial surface increases and refreshes sharply, and the relative velocity of the gas and particles

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maximum value is measured; heat transfer intensity increases dramatically.

Claims (1)

Invention Formula A cyclone-type heat exchanger containing a case with a tangential inlet pipe of a gas suspension in the upper part and two axial outlet pipes for gas and solid phases, chamfer bars of a triangular profile, located on the inner surface of the case along two helical lines, characterized in that In order to intensify heat exchange by increasing the relative velocity between the gas and solid phases and updating the interfacial surface, the bump stops in both screw lines are arranged in a checkerboard pattern and along different lines to the torus. ah, facing towards one another, provided with vanes bent towards the adjacent line. Editor G. Gerber Order 2749/34 VNIIPI USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, ul. Project, 4 FIG. Compiled by Y. Martmnchpk Tehred I. Veres Corrector L. Patay Circulation 636 Subscription