DE4429203C2 - Process and pressure cooling unit for cooling a continuous production item made of steel or other - Google Patents

Description

It is known that continuous production goods made of steel and still today in various spray water cooling systems Type is cooled.

Cooling units with a pressure chamber have been known since 1983, bei which the refrigerated goods for cooling by one of pressurized water is passed through the pressure chamber of a pressure cooling unit. With the patent grant procedure for the German patent DE 38 82 569.4-08, patent granted on July 28, 1993 (EP 0287503) in 1988, a process became known in which the Pressure chamber of the pressure cooling unit divided by baffles is to avoid the undesired full evaporation of the in the pressure chamber prevent forming water / vapor particle mixture, and where at the same time passing the cooling through the dosing te allow cooling water to flow in at both ends of the Pressure space after the front and in front of the rear A single or multi-part pressure chamber is stowed.

All methods of cooling with spray water of all kinds common is the disadvantage that on the one hand (due to missing ver no public worldwide who managed to remove the heat (the cooling) with spray water over the entire surface layer of the production guts to be able to drive evenly, on the other hand it is practical mandatory, the surface layer of the production guts at the impact points of the spray water jets / walls partially to "overcool" to, at the low heat transfer value for the splash water cooling, in the already very long spray water cooling sections, the necessary cooling lung, with z. T. enormously high amounts of cooling water to achieve. The disadvantage of this necessary and inevitable "overcooling after most of the spray water cooling section Production goods qualities through an "unguided reheating let "the supercooled surface of the product in a "water-free compensation line" metallurgical "reparie ren "; the irregularities in the structure remain however continue to exist.

The invention specified in claim 1 is the problem based on the fact that it is suitable for almost all production goods it is more useful to remove less heat from them over a longer period of time pull when the production surface layer is time-par to "overcool" in order to then inevitably need it heat re-heating in "equalization sections (structure repair Routes) ". The invention lies further based on the problem of leading and stopping heat extraction can that the desired structure and the fluctuation in the TARGET cooling temperature according to the product quality ZTU diagram is achieved with minimal deviation and the the amount of cooling water required can be significantly reduced.

I do not know or have access to any publication that the Phenomena when extracting heat from molded, go through the production goods made of steel or other in a printing room described in detail by pressurized water (see also EP 0 266 302, column 2, lines 44ff).  

The advantages achieved with the invention are in particular in that when heat is removed from a warm product onsgut, water-steam generated in a pressure cooling unit Particle mixture, over a metallurgically useful for a long time, not fully evaporating but exactly heat extracting managed, can be held.

The amount of cooling water required when using the Invention according to the process strives for a product-related minimum. Achieving a metallurgically optimal cooling after the quality-related ZTU diagram is, with careful process Leadership, almost inevitable.

All of the advantages mentioned can be expected since the developments development of the process and the pressure cooling unit in effect leave physical constraints and suspected, each however, as far as I know, phenomena in heat that have not yet been researched deprivation of me from a warm production good, which by a with Pressure water flowing through the pressure chamber is carried out.

Further advantageous embodiments of the invention are in the Claims 2 to 5 and 8 to 13 specified.

The training according to claim 2 enables the amount of To be able to reduce heat removal to a minimum, according to claim 3 also to cool hot plant parts, according to claim 4 The surface of the cooled production goods is used related to let arise, according to claim 5, the pressure cooling day to be able to drive the gregat with minimal heat loss. The training according to claim 8 makes it possible to with heavy and heavy production goods necessary larger con quantity of pressurized water through the pressure chamber without any problems to flow, according to claim 9 almost all types of professionals len to be able to cool, according to claim 10, the pressure cooling unit to train for special cooling requirements, e.g. B. immediately subsequently arranged on rollers or rollers, according to claim 11 the pressure cooling unit removes heat at every useful point to apply, medium and heavy according to claim 12 to drive re production goods through the pressure cooling unit Claim 13 to the pressure cooling unit, for. B. in the event of malfunctions Deformation area of the production goods, open and so as To be able to drive spray cooling.

Four embodiments of the invention are in the drawing are shown and are described in more detail below.

Show it

Fig. 1 schematic longitudinal section through a pressure cooling unit,

Fig. 2 schematic longitudinal section through the convection cooling part and the subsequent evaporation / condensation cooling member with the schematic representation of the sequence of the n-times the evaporation control points,

Fig. 3 Schematic diagram of the guided into close limit n times changing ratio of the water component (WT) to the steam particles (DT),

Fig. 4 Schematic representation of the n-times changing heat extraction in the pressure chamber within narrow limits.

Fig. 5 left side: Schematic longitudinal section through a pressure cooling unit for medium-heavy production goods, Re. Side: for even heavy production goods.

Figure 6 Schematic representation. A pressure refrigeration unit with convection cooling portion and a single evaporation / Kon densations-cooling part,

Fig. 7 Schematic representation of a pressure cooling unit between two pairs of rollers or rollers.

In the pressure-cooling unit (1) with a single pressure chamber (2), the jam edges (3) and (4) flowing through the inflow (6), cooling water pressure (about 50%), water pressure by the inflow (8), guide (35 %), through the inflows ( 10.1-10. n) and ( 10.3-10. n) condensation water (15%), with at least approx. 2.5 bar, via the valves with actuator ( 5 ) ( 6 ) and ( 9 ) into the pressure chamber ( 2 ) and out through the storage edges ( 3 ) and ( 4 ).

In the convection cooling section ( 11 ), the cooling and guide pressure water from the continuous hot production goods through the inevitably resulting "self-driving evaporation (SV)" to a water-vapor particle mixture. The water-vapor particle mixture then flows into the "evaporation / condensation cooling parts" ( 12.1 ) and ( 12.2 ) and would lead to full evaporation there.

To prevent full evaporation, open valves with actuators ( 9.11 ) and ( 9.21 ) and closed valves with actuators ( 9.12 , 9.13 ) and ( 9.22 , 9.23 ), through which the inflows are at a n-fold distance ( 10.1-10. N) and ( 10.3-10. N) for the condensation water ( 9 ), starting on both sides at ( 10 .n), the "self-driving evaporation (SV)" in the pressure cooling unit converted into a "guided evaporation (GV)" delt. This point is labeled "Evaporation Guide Point (VF)".

In the further explanation, for the sake of simplicity of explanation, only the convection cooling section ( 11 ) and the "evaporative / condensing cooling section ( 12.2 )" are referred to.

The so-called "evaporation (GV)" changes again when flowing through the pressure chamber ( 2 ) from (VF 10. n) to (VF 10. n-1) at the "reversal point (UP)" again in a "self-propelled evaporator fung (SG) ", which is converted again at the next evaporation guide point (VF 10.19 ) or (VF 10.39 ) into a" guided evaporation (GV) ", and n times as much.

This heat extraction process, which is carried out in small stages, runs, depending on the useful, product-dependent length of the "Ver evaporation / condensation cooling section ( 12.1 ) and ( 12.2 )" to the last evaporation guide point (VF 10.1 ) or (VF 10.3 ).

The amount of heat removal is shown in Fig. 5 analogously with the help of the surfaces 1 , 2 and 3 . The diagram also shows that a slight change in the inflowing amount of the condensed pressurized water ( 9 ) changes the amount of heat removal ver; if more condensed pressurized water ( 9 ) is allowed to flow in, the density of the water-vapor particle mixture (WT / DT) flowing past the inflow becomes larger, because the surface of wetting of the rough, warm product surface is less and thus the amount of heat meentzug (area 1 ) less, so that the production goods leave the pressure cooling unit warmer. If you reduce the dosage of the inflowing condensation water ( 9 ), the density of the water-vapor particle mixture decreases, the wetting area increases, the amount of heat removal (area 1 + 2 + 3) increases, so that Production goods leave the pressure cooling unit colder. In FIG. 4 is horizontal, the "heat extraction time (wet)" and perpendicular to "heat removal quantity (Wej)" applied.

The valve ( 5 ) is guided by the computer to the fixed value that depends on the product and the valves ( 7 ) ( 9 ) ( 9.1 / 9.2 ) and ( 9.11 / 9.12 / 9.13 ) and ( 9.21 / 9.22 / 9.23 ) to bring up the currently present one ACTUAL value for the specified TARGET value of the cooling temperature.

In order to be able to extract only a small amount of heat from a product with a low heat content or from a product with a high heat content and a large amount of heat using this method and with this pressure cooling unit, the valves with actuator ( 9.12 / 9.13 ) and ( 9.22 / 9.23 ). Should z. B. a production good with low heat content only a small amount of heat can be removed, who closed the valves ( 9.11 to 9.13 ) and ( 9.21 to 9.23 ); then the valves ( 9.13 ) and ( 9.23 ) opened; then these valves are guided in a finely guided direction "CLOSE".

By reducing the amount of inflowing condensation pressure water ( 9 ), the "self-propelled evaporation (SG)" can run at a certain point in the pressure chamber ( 2 ) to a "full evaporation point (VV)" and keeps this low Extraction of heat up to the end of the pressure cooling unit.

If medium and heavy production goods are to be cooled ( Fig. 5), the valves ( 9.11 ) or ( 9.21 ) are opened, then first the valves ( 9.12 or ( 9.22 ), then the valves ( 9.13 ) or ( 9.23 ) fine guided in the direction of "OPEN".

Claims (13)

1. A method for cooling a continuous production goods made of steel or other, in a pressure cooling unit ( 1 ) with only one pressure chamber ( 2 ) between each storage edge ( 3 ) and ( 4 ) at both ends of the pressure chamber, in the cooling at different points - ( 5 ), guide ( 7 ) and condensation pressurized water ( 9 ) flow in, characterized in that the condensed pressurized water ( 9 ) in an arbitrarily long region of the length of the pressure chamber ( 2 ), preferably over 50% of the end of the pressure chamber, flows in through the inflows ( 10.1-10. n) and ( 10.3-10. n) arranged in n-times intervals into the pressure chamber ( 2 ) and there by the "self-propelled evaporation" that forms n times. SV), at the "evaporation guide points (VF)" carried out n times, is converted n times into a "guided evaporation (GV)" and at the same time, by metering the amount of the incoming condensation pressure water ( 9 ), guiding you te of the water-steam particle mixture (WT / DT) that is created in the convection cooling section ( 11 ) and is not fully evaporating but exactly heat-extracting, which means that its size is variable (WEmin / WEmax) and its uniformity with little fluctuation range ( WE + / WE-) accessible via the length of the "evaporation / condensation cooling section" ( 12.1 ) and ( 12.2 ) exactly controlled heat extraction, in a, within limits metallurgically useful, pressure cooling unit ( 1 ) is ensured. 2. The method according to claim 1, characterized, that for the cooling of certain production qualities the "self-driving evaporation (SV)" from a guided "Ver vaporization point (VP) "as" guided full evaporation (VV) " is driven. 3. The method according to claim 1 and 2, characterized, that it is used for cooling hot plant parts becomes. 4. The method according to claim 1 to 3, characterized, that the cooling water, for cooling and / or for the be special formation of the surface to be cooled, additives given or other suitable coolants are used. 5. The method according to claim 1 to 4, characterized, that when the pressure cooling unit top is up, the pro Production goods abge after the spray water cooling process can be cooled.   6. pressure cooling unit ( 1 ) for performing the method according to claim 1 to 5 for cooling a continuous produc- tion material made of steel or other, with a one-piece pressure chamber ( 2 ) between each a storage edge ( 3 ) and ( 4 ) at the ends of the pressure chamber , flow into the cooling ( 5 ), guide ( 7 ) and condensation pressurized water ( 9 ) at different points, characterized in that the inflow ( 10.1-10. n) which is dimensioned for cooling due to the condensation pressurized water ( 9 ) and ( 10.3-10. n) in a region of the length of the pressure chamber ( 2 ), which is of limited metallurgical value , preferably over 50% from the end of the pressure chamber, at n times ( 10.1-10. n) and ( 10.3-10. N) are arranged. 7. A pressure cooling unit according to claim 6, characterized in that the part of the pressure chamber ( 2 ) through which the cooling water flows is dimensioned in such a way that the product to be filled is aimed at a minimum while on the other hand so much cooling water remains in the pressure chamber that the steam particles remain in the water-vapor particle mixture forming in the pressure chamber ( 2 ) can still condense safely in the pressure chamber. 8. pressure cooling unit according to claim 6 and 7, characterized in that the one-piece pressure chamber ( 2 ), towards its ends, is formed due to cooling with increasingly larger cross-sections. 9. pressure cooling unit according to claim 6 to 8, characterized, that the cross section of the pressure chamber from the cross section of the production goods to be cooled is analogous. 10. Pressure cooling unit according to claim 6 to 9, characterized in that the pressure cooling unit is formed with only one evaporation / condensation cooling part ( 12 ) which is arranged before or after the convection cooling part. 11. pressure cooling unit according to claim 6 to 10, characterized, that it lies between two pairs of rollers or rollers. 12. Pressure cooling unit according to claim 6 to 11, characterized in that transport rollers are installed in the lower part and in the lower and upper part a pair of rollers each as a storage edge ( 3 ) and ( 4 ) are arranged at the ends of the pressure space. 13. Pressure cooling unit according to claim 6 to 12, characterized in that the pressure cooling unit is divided into a lower part ( 13 ) and an upper part ( 14 ).