FI61570C - FOERFARANDE FOER BEHANDLING AV VAETSKOR I VAERMEOEVERFOERINGSANORDNINGAR - Google Patents

Description

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Mexico-Mexico (MX) 1377 * + * + Proven-Styrkt (71) (72) Abraham C. Miselem Asfura, Tecualiapan No. 60-22, Mexico 21, DF, Mexico-Mexico (MX) (7 * 0 Leitzinger Oy (5 **) This invention relates to a new method for treating liquids in heat transfer equipment, in which the method comprises fed to heat transfer units from which the mixture of condensate and steam leaving is led to steam separation traps where the condensate and exhaust steam are separated, this method is useful in both a single unit and a multiple unit, in which case heat transfer is improved and steam consumption is reduced.

The method essentially involves, together with the condensate, removing part of the steam from inside the steam-heated unit, separating this steam from the condensate and non-condensing gases before and after feeding this exhaust steam to another unit or group of units operating at lower pressure.

All industrial equipment and systems that use steam as a heat transfer medium are constantly being studied to improve the efficiency of all components in order to reduce operating costs. To achieve this, even if the pipelines are insulated, leaks are removed, etc., there are always losses that reduce efficiency and increase costs.

The method according to the invention is characterized in that steam is passed to the first group of heat transfer units via a common collector line, the heat transfer unit discharge lines are connected to steam separation traps. the steam is passed through corresponding steam separation traps, but in this case both the separated steam and condensate are removed from the steam traps together via a collector line to a discharge tank from which the exhaust steam is fed via a from this unit to the next unit and from there on to the third unit, whereby this method of removal provides an automatic pressure drop of one from one age to the next.

In one embodiment of the invention, a group of steam traps are provided in each unit of the third group, which traps remove both the condensate and the exhaust steam together via a pipeline to a final condensate collector which also collects the condensate removed from the discharge tank through a conventional separation trap.

For multi-stage treatment of liquids in a plurality of heat transfer units, each unit having a plurality of heat transfer devices, it is preferred that steam be supplied via parallel lines to each of the first heat transfer that the individual separated continuous steam streams from each first group heat transfer unit are collected in a common first stage collector steam pipe, that separate condensate streams from each first group heat transfer unit are collected in a common first stage condensate collector line that is independent of said steam .

3 61570

Other features of the invention will be apparent from subclaims 4-5.

The method according to the invention can be used in all types of steam-heated devices and in this description it has been described as being used in a paper machine comprising several rotating cylinders or dryers which are heated by steam. However, reference is made to a paper machine only as a practical example of the application of said method, which does not limit the scope of the invention, as the method is suitable for implementation in any industry or apparatus utilizing steam.

It should be noted that the entire amount of condensate can be recovered and no steam is wasted in the open air, as is the case with other conventional methods.

Referring to the accompanying drawing, which shows a paper dryer assembled from a plurality of steam-heated rotary drying cylinders, it can be seen that it has a first group of cylinders 1 with common steam collector lines 2 and separate inlet manifold lines. a second shut-off valve 5 at the outlet. Each discharge branch line 6 is connected to a special steam trap 7. This specially modified steam trap receives and separates the condensate and steam from the drying cylinder 1, discharging the condensate through a pipe 10 with a shut-off valve to the manifold 8 and further to to the manifold 14. This manifold 14 is divided into two leads 14a and 14b. Line 14a passes to a thermal non-condensing gas removal device 15 which removes gases to the outside air. The second line 14b passes to a condensate separator 16, from which a collector line 17 leads to the separated steam cylinder dryers 18 via a collector line 19 and shut-off valves 20. The condensate is discharged from the separator 16 via a standard condenser 22 and a pipeline 21 to an outlet tank 11.

The second group of cylinder dryers is discharged through separate branch lines 23 and shut-off valves 24 into special steam separation traps 25 which receive both steam and condensate. In this case, in particular, the traps 25 remove both the condensate and the exhaust steam to separate pipelines 26 leading to a manifold 27 common to the second group and finally to an exhaust tank 11.

The exhaust steam in the discharge tank 11 is led along the pipeline 2R to the third group through the cylinder 29 (the third group in the paper machine with respect to the direction of travel). This cylinder dryer 29 operates at a lower pressure than the two groups mentioned above. In the third group, steam is removed via line 30 to the next cylinder dryer 31. From this second dryer 31, steam is removed via line 32 to the first cylinder dryer 33. Such a way of supplying steam to this group of cylinders causes an automatic pressure drop from one cylinder to another. As a result of the pressure drop, each cylinder has a lower temperature in the direction of the pressure drop, with the first cylinder in contact with the paper at the lowest temperature. The system provides a temperature gradient that increases in the direction of paper flow. Adjusting the pressure in the discharge tank 11 allows the temperature of the first dryer to be adjusted to prevent sticking otherwise caused by too high a temperature of the paper.

Discharge of each of these three dryers 29, 31 and 33 takes place via branch lines 34 and shut-off valves 35 to special separation traps 36 which remove both condensate and separated steam through pipe 17 to the last condensate collection tank 38 from which they are pumped into the boiler.

The condensate is also discharged from the discharge tank 11 through a standard trap 39 to the condensate collecting tank 38.

The invention has been presented above as a preferred embodiment, considering that it has been applied to a paper dryer as a practical application, but it is fully understood that the method according to the present invention is not limited to the paper industry. Furthermore, it is to be understood that any variation in the installations based on the description is possible within the scope of the invention.

5

Claims 615 7 0 1. A method for treating liquids in heat transfer devices, in which steam is fed to heat transfer units from which a mixture of condensate and steam is passed to steam separation traps, where condensate and exhaust steam are separated. , connecting the exhaust lines (6) of the heat transfer units (I) to steam separation traps (7), from which the condensate is led through a common collector line (8) to the discharge tank (11) and from which the exhaust steam is led to another group of heat transfer units (18) from the second group of heat transfer units (18) the steam is led through respective steam separation traps (25), but in this case both the separated steam and condensate are removed from the steam traps (25) together via a collector line (27) to an outlet tank (11). insulation m to one heat transfer unit (29) of the transfer unit group, which group operates at a lower pressure than the other groups, and that steam is removed from this unit (29) to the next unit (31) and further to the third unit (33), thereby providing an automatic pressure drop from unit to unit. .

Method for treating liquids in heat transfer devices according to claim 1, characterized in that a group of steam traps (36) are provided in each third group unit (29, 31, 33), which traps (36) remove both condensate and exhaust steam together via a pipeline (37a) to a last condensate collector (38) which also collects the condensate which is removed from the discharge tank (II) via a conventional separation trap (39).

Method for multi-stage treatment of liquids in a plurality of heat transfer units according to claim 1 or 2, each unit having a plurality of heat transfer devices, characterized in that steam is supplied via parallel lines (3) to each heat transfer unit ( for the first stage continuous steam flow to the pipe (12) separate from the first stage condensate flow (10), that the individual separated continuous steam flows (12) from each first group heat transfer unit (1) are collected in a common 6 61 570 first stage collector steam pipe (14); the separate condensate streams (10) from the heat transfer unit (1) are collected in a common first stage condensate collector line (8), which is independent of said steam collector line (14), where the continuous steam flow is used directly and continuously in the heat transfer units of the second group (18).

A method according to claim 3, characterized in that the separated exhaust condensate streams and steam streams from the second heat transfer unit (18) are led to an exhaust tank (11) to form exhaust steam which is led to a third group heat transfer unit (29).

Method according to Claim 4, characterized in that the condensate streams (8, 21, 27) of both the first heat transfer unit group (1) and the second heat transfer unit group (18) are led to an exhaust tank (11) to generate exhaust steam supplied to the third group heat transfer unit (29).

Method according to Claim 3, characterized in that the steam from the common steam removal collector line (14, 17, 19) of the first group of heat transfer units is fed directly via parallel channels to a plurality of heat transfer units (18) of the second group.

Claims (3)

7 61570 1. A method for treating liquids in heat transfer devices, in which method Anga is measured in the heat transfer units, from which a mixture of condensate and Anga is conducted in -ter (1) through a common collection conduit (2), the drainage conduits (6) of the heat transfer units (1) are joined to the separation traps (7), from which the condensate is passed through the common collection conduit (8) to a sewer container (11) and from which the sewer Anga is led to another group of heat transfer units (1R) via a condensate separator (16) and an air conductor (15), from the other group (18) heat transfer units Anga is passed through the corresponding Ang traps (25), but in this case is removed from the steam traps (25), both the separated steam and the condensate collectively through the collection conduit (27) into the drainage container (11) from which sewage the steam through a conduit (28) is led to one (29) by a third group of heat transfer units, which group operates at a lower pressure than the other groups and that the steam is removed from this unit (29) to the next unit (31) and from this further to a third unit (33), whereby this removal achieves an automatic pressure reduction from one unit to another. Method according to claim 1 for the treatment of liquids in heat transfer devices, characterized in that a group of Ang traps (36) is arranged for each unit in the third group (29, 31, 33), which traps (36) remove both the condensate and the sewage vapor jointly through the conduit (37a) to a final condensate collector (3R), which also collects the condensate which is removed from the wastewater tank (11) by means of a regular separation trap (39). A method according to claim 1 or 2 for multi-stage treatment of liquids in a plurality of heat transfer units, each unit being provided with a plurality of heat transfer devices, characterized in that Anga is led through parallel lines (3) to each heat transfer unit (1) in the first group of heat transfer units. , from which each is led a continuous sewage stream,