FR2490801A1 - HEAT TRANSMITTERS FOR REGENERATION HEAT EXCHANGE - Google Patents

Abstract

THE INVENTION CONCERNS HEAT TRANSMITTING ELEMENTS IN THE FORM OF HOLLOW SPHERES OR POLYHEDRAS 1 FILLED TOTALLY OR PARTLY WITH A LATENT HEAT ACCUMULATING MASS 3 AND POSSIBLE WITH AN ADDITIONAL INERT GAS 4, ARRANGED IN A TURBULENT OR STATIC LAYER, HEAT EXCHANGER AND CYCLICALLY TRANSPORTED FROM A HOT ZONE TO A COLD ZONE, ENSURING AN INTENSIVE THERMAL EXCHANGE AND AUTOMATIC CLEANING OF THE ELEMENTS.

Description

The present invention relates to the elements transmits-

  heat generators for heat exchange by regeneration

ration.

  The invention proceeds from heat accumulators.

  known tent commonly used as items to

high heat capacity.

  These latent heat accumulators transmit heat from the hot zone to the cold zone by means of an indirect agent such as metallic or chemical compounds entering into fusion in the hot zone and

solidifying in the cold zone.

  The known latent heat accumulating masses are in the form of fixed or

fixed containers.

  In many cases of technical application, and in particular for the exchange of heat between gases with a high content of dust and soot or polluted liquids, very encrusting is formed on the surface of the heat exchangers of known devices. difficult to eliminate The object of the present invention is to provide

  heat transmitting elements allowing an exchange

  intensive and impeccable thermal age that can be

  cleaned without complicated equipment.

  This object is achieved, in accordance with the invention, by a device in which the elements have the form of spheres or polyhedra, hollow and rigid, made of material resistant to temperature and corrosion, with free internal space of a mass

latent heat accumulator.

  In addition, the elements according to the invention can be used in the form of turbulent layers or simply heaped layers. Unlike known heat accumulating masses, the elements according to the invention move,

  during work, in turbulent layers or sim-

  heaped up The transmission of heat from a hot zone to a cold zone takes place by the cyclic transport of

  elements between hot and cold zones.

  In the hot space, the accumulation of heat in the elements takes place by heating their wall and the latent (internal) accumulating mass but

  also by melting the charge and heating the

  liquid phase after fusion of the latent accumulating mass After transport of the elements in the cold space, the heat transfer takes place by cooling the wall and the liquid phase (internal) to the solidification temperature as well as by transfer of the heat of solidification and of the heat of cooling of the latent accumulating mass in

solid phase.

2490801?

  The decisive advantage of the invention lies in the fact

  that the elements according to the invention are easy to clean

  toyer, cleaning themselves from the fact that they are

  used as turbulent or simple layers-

  The elements according to the invention function in a

  identical to the latent accumulating mass and poss-

  tooth also a high thermal transmission coefficient at the limit of the gas and the surface of the element in a turbulent layer and a high thermal capacity due to their filling with a latent accumulating mass The invention is described below in detail with reference to some preferred, nonlimiting examples of embodiment shown in the accompanying drawings in which: - Figure 1 shows a diametrical section of a

  element according to the invention, in the form of a hollow sphere

  se; - Figures 2, 3, 4 and 5 show various modes of arrangement of the elements according to the invention in a Ljungstrbm heat exchanger; FIG. 6 represents the use of the elements according to the invention, in the form of a turbulent layer, in a column heat exchanger, shown in vertical section; and - Figure 7 shows the arrangement of the elements according to the invention, in the form of a static layer, in a column heat exchanger, shown

in vertical section.

  The element according to the invention, shown in Figure 1, consists of a hollow sphere 1 whose internal face

  of wall 2 may or may not have a capil-

  5, and which is filled with a latent accumulating mass 3 and, in the case where the latter does not completely fill the sphere, with an inert gas 4 This latent accumulating mass can be made either of a metal such as natrium, aluminum or,

  for high temperatures, silver, either

  chemical poses such as LiH, Li?, MgF2 or similar compounds the wall 2 of the sphere can be made of metallic or non-metallic materials

  Figures 2, 3 and 4 show the rotor of an

  Ljungstrem 6 heat changer with vertical axis 7.

  In the case of FIG. 2, the elements according to the in-

  vention 1 are placed on top of accumulated masses

  conventional trices 8. In the case of FIG. 3, they are placed below. FIG. 4 represents a Ljungstrbm heat exchanger not containing conventional accumulating masses but only the elements according to the invention 1. In the four cases of FIGS. 2, 3, 4 and 5, the cold gas enters at 9 and the hot gas in 10. Depending on the direction in which the elements 1 are swept by the gases, a static layer or a turbulent layer is formed. The turbulent layer therefore only forms when the gas stream is introduced from below into the heat exchanger. If, for example, the axis 7 of the rotor 6 is horizontal (case of FIG. 5) and that the elements 1

  are therefore placed in a static layer, the cleaning

  age of elements is effected by their revolution in

  the enclosure of each sector, without the need for con-

  additional summation of energy to operate a blower

  Figure 6 shows a co-

  lonne and turbulent layer in which (as in the

  case of Figure 7) the hot gas enters at 11, é-

  heats the elements 1, and leaves the column in 12

  while the cold gas enters at 13 and leaves at 14.

  The heated elements descend by a device 15 into the lower part of the column and are brought back into the upper part thereof by a pneumatic or mechanical conveyor system 16 not

shown in detail.

  FIG. 7 represents a heat exchange column with a static layer in which the heated elements

  1 arrive, for example by a wheel valve

  slide 17, in the lower part of the column by separate charges, heat the cold gas there and are brought back to the upper part of the column by the

conveyor system 16.

Claims (2)

  1. Heat transmitting elements for heat exchange by regeneration, characterized in that   said elements (1) have the form of hollow spheres   its rigid or hollow polyhedra, the free internal space of which is partially or completely filled with a latent accumulating mass (3), or   additionally partially of an inert gas (4).   2. As a new industrial process, use of   elements according to Claim 1, characterized in   what said elements are used in form   turbulent layer and / or static layer.