DE816580C - Regenerator mass for regenerative heat exchanger - Google Patents

Description

Regenerator mass for regenerative heat exchangers The invention relates to a regenerator mass for regenerative heat exchangers with dense in several layers side by side, clamped at their ends, floating freely, parallel mutually extending, made of wire. thin. air-permeable storage parts.

With 1generative heat exchangers, efforts are made to go along with it low cost of materials, d. H. with a small and light heating surface, as large as possible Transferring amounts of heat. It is relatively easy to achieve that Weight of the heating surface, d. H. for a given specific heat the heat capacity to reduce the regenerator mass forming the heating surface. For this only has to in the case of moving regenerator masses, their speed of rotation is increased, while the same purpose for stationary regenerator masses, analogously by abbreviation of individual periods of the heat exchanger can be achieved.

A reduction in the heat-exchanging surface is, however, only achievable if it succeeds the heat transfer coefficient between the heat carriers and the regenerator mass to increase. In the following considerations, the possible Increasing the heat transfer coefficient by increasing the gas velocity Severe turbulence or frequent changes in direction of the gas flow are disregarded as these measures result in increased pressure loss during heat exchange, i. H. are associated with a considerable additional effort in fan work. as well are intended to be rapid movements of the regenerator mass, which have a significant relative speed towards the heat-exchanging gases cause, remain out of approach, since also this requires a greater effort. Under the aforementioned conditions, that the relative speed between the flowing heat carrier and regenerator mass, furthermore, the pressure loss during the flow process should remain unchanged the size of the heat transfer coefficient solely due to the surface shape of the heat-absorbing or -releasing regenerator mass determined.

It is known that the heat transfer coefficient both when flowed through Hollow bodies, crevices, channels, etc. as with solid bodies with a decreasing flow, hydraulic diameter increases. The length of the surface flowed through or around in the direction of flow is of minor influence on the size of the heat transfer, the more so as the great lengths (in relation to the hydraulic diameter) that cause a slight increase in heat transfer, for structural reasons, as are also practically not carried out because of the increased risk of clogging can.

In today's usual execution of the regenerator mass for regenerative warmers the basic conditions described above are used to achieve high heat transfer coefficients largely followed.

There are z. B. by assembling thin metal sheets in layers at a small distance from each other, narrow channels or gaps are formed that form one have very small hydraulic diameters. Attempts have also been made with tightly stretched thin wires or with wire screens, these like those drums running around the jacket through which the heat transfer medium flows form to achieve high heat transfer coefficients.

All these types of embodiment of the regenerator mass have in practice Operation have the same disadvantage, namely, the more they are physically approach the conditional best value of the heat transfer, d. H. the narrower the channels and crevices and the finer and more densely the thin wires are stretched, the more so is the pollution the surface and the blockage of the channels and flow cross-sections increase. It is due to the inevitable fly ash, soot and dust content of the heat transfer media, mainly due to the flue gas.

Added to this is the fact that once clogged channels, etc., only through sharp Blow out can be cleaned successfully, and that this blow out with considerable Power and heat losses are associated.

So far there are all proposals with very narrow flow cross-sections and thus to work with the desirable, high heat transfer coefficients on which legitimate opposition in practice has failed. The invention is a Regenerator mass, with which also (lie 1 # physical basic conditions for high heat transfer coefficients, i.e. narrow duct or gap cross-sections and thin wires are used, but with the gap cross-sections and the heat-exchanging Above @ surface either automatically or continuously with very little effort clean so that harmful clogging of the 1) tirclistrZ3mduerschnitte or soiling the heating area does not enter even with flue gases rich in fly ash. Furthermore the Regeneratorinasse should in a simple and thus cheap `` ice '' the accommodation enable large surfaces per volume unit.

This is to be achieved according to the invention in that the memory parts consist of cylindrical coil springs made of thin steel wire and which by tensioning of the springs between the spring coils freed gaps Ilexible, flexible, vibratory Durchströmduersclmitte for the heat transfer medium preferably flowing transversely to the spring axes (Air, flue gas, etc.). the wire windings themselves, susceptible to vibration. heat exchanging and heat-storing 1leizH: ichen.

Furthermore, the coil springs consisting of vibrations: iliigen Ileizfl: iclie, through external influences, more mechanical. acoustic or electromagnetic Kind of moved or held in Sch-, vingtingen from time to time or continuously will.

Furthermore, the springs made of profiled wire, for. B. with elliptical or rhombic cross-section, to reduce the flow resistance also made of frustoconical coiled and / or flat-pressed springs, as they are used in particular for filling the cylinder sectors of Ljungströni preheaters are suitable, exist.

According to the invention, several helical springs can also be different Diameter, plugged into each other to be used as a regenerator mass.

Finally, it is still possible to use regenerative heat exchangers which a revolving, endless chain transfers the heat, according to the invention from tight endless helical springs arranged next to one another, which run like a drive belt around rollers circulate and build up the heat-promoting chain belt yourself. Here are according to the invention, several layers of helical springs on top of each other, the transverse lying Coil springs and / or spacer plates are separated from one another and drive belt-like revolve around rollers, usable. By inserting sheet metal strips into the '' Findings of the circulating, endless spring band, perpendicular to its direction of movement, can be a gas flow within the belt in or against its direction of movement and thus a mixture of the two heat carriers (flue gas and air) can be prevented.

The last two forms of application of the regenerator composition according to the invention have the advantage that when the spring Land. or the spring band around the rollers due to the elastic deformation (short-term Spreading and compressing the spring coils) a continuous self-cleaning entry.

Claims (3)

PATENT CLAIMS i. Regenerator mass for regenerative heat exchangers with tightly arranged in several layers, clamped at their ends, free floating, parallel to each other, made of wire, thin, air-permeable storage parts, characterized in that the storage parts consist of cylindrical coil springs made of thin steel wire and which by tensioning of the springs between the spring coils freed column flexible, vibratory Flow cross-sections for the heat transfer media, which preferably flow transversely to the spring axes, the wire windings themselves, vibratory, heat-exchanging and heat-storing Form heating surfaces. 2. Regenerator mass according to claim i, characterized by mechanical, acoustic or electromagnetic devices through which the vibratory Coil springs existing, heat exchanging heating surface from time to time or is continuously vibrated or held. 3. Regenerator mass according to claim i or 2, characterized in that the helical springs are made of profiled Wire, e.g. B. are made with an elliptical or rhombic cross-section. Regeneratorinasse according to one of claims i to 3, characterized in that flat-pressed cylindrical or flat-wound coil springs are used to build up the regenerator mass are. ;. IZegencratorma,;. E according to one of claims i Abis 4, characterized in that that frustoconical coiled helical springs to build up the regenerator mass-e are used. 6. Regeneratorm.asse according to one of claims i to 5, characterized in that that several coil springs of different diameters are plugged into one another as a regenerator mass uses saiid. 7. Regeneratonrnasse according to one of claims i to 4 or 6 for Regenerati; v-Wärmeeaustatischer, in which a revolving, endless chain the heat transmits, characterized in that closely arranged, endless Helical springs revolve around rollers like a drive belt and even the heat-promoting one Chain band. B. regenerator mass according to one of claims i to 4, 6 or 7, characterized in that several layers of endless coil springs through across lying coil springs or spacer plates separated from one another, like a drive belt on one another revolve around rollers and form the heat-promoting chain belt. Referred publications: German patent specification No. 715 568.