EP4284974A1 - Verfahren zur entschwadung von prozessabluft - Google Patents
Verfahren zur entschwadung von prozessabluftInfo
- Publication number
- EP4284974A1 EP4284974A1 EP21839228.0A EP21839228A EP4284974A1 EP 4284974 A1 EP4284974 A1 EP 4284974A1 EP 21839228 A EP21839228 A EP 21839228A EP 4284974 A1 EP4284974 A1 EP 4284974A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- exhaust air
- supply air
- fan
- exhaust
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/20—Waste heat recovery
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G5/00—Safety devices
Definitions
- the invention relates to a method for de-steaming process exhaust air from a plant for the production or processing of a fibrous web according to the preamble of claim 1 .
- This fog can fall as precipitation in the immediate vicinity of the plant and lead to slippery roads, especially in winter. Low-lying clouds of fog can also impede visibility on the road.
- Visible mist reduction has historically meant additional energy expenditure for heating the exhaust air stream to a point beyond the dew point, sometimes aided by pre-condensing some of the humidity. Since this additional energy expenditure is not economical, it was only rarely implemented.
- a disadvantage of the prior art is, on the one hand, that the technical outlay for de-steaming is not insignificant, since a dedicated heat exchanger and a blower system with a suitable controller must be provided. Since a considerable amount of outside air also has to be pumped, this de-steaming also increases the energy consumption of the system.
- the object of the present invention is therefore to propose a simple and inexpensive method that effectively reduces or prevents the formation of mist.
- the object of the present invention is to specify an alternative to the method described in DE102019114467, which is inexpensive and can be used very widely and, in particular, can also be retrofitted to existing systems.
- the method is a method for de-steaming of process exhaust air from a plant for the production or processing of a fibrous web, in particular one Pulp, paper or board web, wherein the plant comprises a drying section in which the fibrous web is at least partially dried by means of contact drying, the drying section being supplied with inlet air and exhaust air being removed from the drying section, and with the inlet air having a higher temperature and a has a lower relative humidity than the exhaust air.
- a partial flow is branched off from the supply air and is mixed with the exhaust air to produce the process exhaust air before it is released to the environment.
- the relative humidity [%] of the process exhaust air is at least 5 percentage points, preferably at least 10 percentage points, below the relative humidity of the exhaust air
- a supply air fan is provided in the supply air line and the partial flow of the supply air is branched off after the supply air fan. Then no separate blower is necessary for the promotion of the partial flow and the partial flow is conveyed with the supply air blower that is already present.
- the partial flow of the supply air is branched off before the supply air fan.
- an additional thrust fan for conveying the partial flow is expediently provided in the line of the partial flow of the supply air.
- the thrust fan is designed to be frequency-controlled.
- the position of the branching off of the partial flow can be freely selected, and in particular can also be provided in front of the supply air fan.
- the supply air is conditioned, in particular heated, and the partial flow of the supply air is branched off after or between the individual conditioning stages. This heating is usually necessary anyway for the use of the supply air in the dryer section and the de-steaming effect of the partial flow of the supply air is thereby increased.
- an exhaust air fan is provided in the exhaust air line and the supply air is mixed with the exhaust air after the exhaust air fan.
- the supply air is mixed with the exhaust air before the exhaust air fan.
- the supply air can come from the local conditions, it may be necessary to integrate the partial flow of the supply air in front of the exhaust air fan. The basic function of the method is retained.
- the pressure generated by the supply air fan is usually higher than the pressure generated by the exhaust air fan. This ensures that the partial flow of the supply air is safely mixed into the exhaust air flow. An undesired return flow of the exhaust air into the line of the partial flow of the supply air can be avoided in this way.
- the temperature is measured in the exhaust air and/or the intake air and/or in the process exhaust air.
- the humidity is measured in the exhaust air and/or the incoming air and/or in the process exhaust air.
- means in particular adjustable flaps, are provided in order to change the quantity of the partial flow of the supply air to the exhaust air.
- these means can also be implemented by providing a frequency-controlled thrust fan in the partial-flow line, and the quantity of the partial-flow is changed via this control. This adjustment via a frequency-controlled fan is usually more reliable and precise than via a controlled flap.
- the branched-off partial flow can be adjusted by means of the adjustable flaps or other suitable means. In very advantageous embodiments, it can be provided that the amount of the partial flow of the supply air to the exhaust air is controlled or regulated via the flow rate of the thrust fan, with the flow rate of the thrust fan being increased or reduced depending on the flow rate of the exhaust air fan.
- this method enables an increase in the discharge speed of the process exhaust air at the exhaust air outlet above the roof.
- this method can be used to enable a constant blow-out speed, as described above. This is often of particular relevance in relation to the emission reports.
- the thrust fan is switched off completely or is operated at a minimum speed. If the output of the exhaust fan is reduced below this threshold value, the output of the thrust fan is increased.
- Suitable curves can be stored for the exact connection between reducing the exhaust air fan and increasing the thrust fan. These can be determined depending on the system. For example, a 'bang-bang' control is possible, in which the thrust fan is driven to maximum output as soon as the output of the exhaust fan falls below a threshold value.
- a functional relationship for example a linear or quadratic relationship between the decrease in the reduction of the exhaust air fan and the increase in the thrust fan can be stored.
- the quantity of the partial flow of the supply air that is mixed with the exhaust air is adjusted as a function of the temperature and/or humidity of the exhaust air and/or process exhaust air and/or supply air and/or the environment.
- the partial flow of the supply air and the exhaust air are mixed by means of a static mixer.
- the process exhaust air is often released into the environment at a height of more than 40 m, in particular 60 m or more above the ground.
- FIG. 1 shows a scheme for a method according to one aspect of the invention.
- FIG. 2 shows a scheme for a method according to a further aspect of the invention.
- FIG. 3 shows a scheme for a method according to a further aspect of the invention.
- the drying section 1 of a machine for producing a paper or cellulose web is usually enclosed by a hood.
- the air in the hood must be able to absorb the water removed from the paper web. In order to avoid that this can no longer absorb the water due to saturation, part of the hood air is continuously discharged as exhaust air 2. Since there is still some energy in this warm exhaust air 2, the exhaust air 2 is cooled via one or more heat exchangers 3, 4.
- an air/air heat exchanger 3 for preheating ambient air 8 and an air/water 4 heat exchanger 4 for preheating process water, for example are provided.
- an exhaust fan 5 is arranged, which promotes the exhaust air in the direction of a chimney, etc., for example.
- the hood or the dryer section 1 is constantly supplied with fresh air 12 .
- This supply air 12 should be as warm and dry as possible.
- supply air 8 usually ambient air 8- is sucked in by an air supply fan 11 and conditioned in one or more stages.
- a heat exchanger 3 is provided in FIG.
- a first heater 9 and a second heater 10 are also provided here, which further heat the air by means of condensate, steam or other suitable heating media.
- the conditioning devices 3, 9, 10 are all arranged in front of the supply air fan 11 in FIG.
- a partial flow of the supply air 13 is now branched off from the supply air between the supply air fan and the dryer section 1 .
- This partial flow 13 is then mixed with the exhaust air 2 .
- the resulting process exhaust air 7 is discharged to the environment, usually via a silencer 6 and a suitable chimney.
- an adjustable flap 14 or other suitable means 14 can be provided.
- FIG. 1 again shows very well how easily the proposed de-steaming process can be installed in an existing system. It is only necessary to install the line—shown in dashed lines—for the partial flow of the supply air 13 and, if necessary, an adjustable flap 14 for metering the partial flow 13. In addition, with the exception of the flap 14, this solution is almost maintenance-free.
- the exhaust air fan 5 conveys approx. 156,000 m 3 /h of exhaust air 2 with a temperature of 58° C. and a relative humidity of 96%. If this exhaust air 2 were to be discharged directly into the environment, vapor or fog would almost certainly form. If this exhaust air 2 is mixed with a partial flow 13 of the supply air of approx. 11,000 m 3 /m at a temperature of 110° C. and a relative humidity of 2%, this results in process exhaust air 7 of approx. 167,000 m 3 /h a temperature of 61 °C and a relative humidity of only 78%. As a result, the tendency to form plumes has been massively reduced.
- the embodiment in FIG. 2 differs from the variant in FIG.
- an additional thrust fan 15 is provided in the line.
- This thrust fan 15 can in particular be frequency-controlled.
- the quantity of the partial flow 13 can be changed directly via the thrust fan 15 as an alternative or in addition to a flap 14 .
- the supply air fan 11 can also be operated unchanged when the partial flow quantity 13 changes.
- the partial flow 13 is discharged immediately in front of the supply air fan.
- it can also be provided to arrange this branch further forward, for example between the heaters 9 and 10, or after the heat exchanger 3.
- the partial flow 13 of the supply air may then have a slightly lower temperature than the main flow of the supply air 12. However, this can be sufficient for the desired de-steaming, and costs for the heating 9 and/or 10 can thus be saved.
- the diagram shown in Figure 3 is particularly suitable for carrying out a method in which the quantity of the partial flow of the supply air 13 to the exhaust air 2 is controlled or regulated via the flow rate of the thrust fan 15, with the flow rate of the thrust fan 15 depending on the flow rate of the Exhaust fan 5 is increased or decreased.
- the performance of the thrust fan 15 can sometimes be reduced to such an extent -if necessary. even be turned off that the partial flow of the supply air 13 is only promoted with a very low pressure. If this pressure is below the pressure that prevails in the line of the exhaust air 2, this can mean that the moist exhaust air 2 through the line of the partial flow of the supply air 13 or he supply air 12 back into the Drying hood of drying section 1 is pressed.
- a flap 14a is provided in order to prevent such a backflow. Since the flap 14a, in contrast to the embodiment shown in FIG. 1, is not used to adjust the flow rate, it does not have to be designed as an adjustable flap 14 either. It is perfectly sufficient if the flap 14a can switch between the “open” and “closed” positions.
Landscapes
- Drying Of Solid Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021101998.2A DE102021101998A1 (de) | 2021-01-28 | 2021-01-28 | Verfahren zur Entschwadung von Prozessabluft |
| PCT/EP2021/087027 WO2022161709A1 (de) | 2021-01-28 | 2021-12-21 | Verfahren zur entschwadung von prozessabluft |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP4284974A1 true EP4284974A1 (de) | 2023-12-06 |
| EP4284974B1 EP4284974B1 (de) | 2025-02-12 |
| EP4284974C0 EP4284974C0 (de) | 2025-02-12 |
Family
ID=79270477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21839228.0A Active EP4284974B1 (de) | 2021-01-28 | 2021-12-21 | Verfahren zur entschwadung von prozessabluft |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4284974B1 (de) |
| DE (1) | DE102021101998A1 (de) |
| WO (1) | WO2022161709A1 (de) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH608289A5 (en) * | 1976-06-15 | 1978-12-29 | Escher Wyss Gmbh | Drying apparatus, in particular for paper machines |
| AT396696B (de) | 1992-02-13 | 1993-11-25 | Andritz Patentverwaltung | Verfahren und vorrichtung zum be- und entlüften einer mindestens eine trockengruppe umfassenden trockenpartie einer papiermaschine |
| FI107395B (fi) | 2000-02-21 | 2001-07-31 | Metso Paper Inc | Menetelmä ja laitteisto ilmanpoistojen ja -syöttöjen järjestämiseksi kuivatusosassa |
| DE202013101174U1 (de) * | 2013-03-19 | 2014-04-24 | Dieffenbacher GmbH Maschinen- und Anlagenbau | Anlage zur Verarbeitung von Biomasse, vorzugsweise eine Anlage zur Herstellung von Papier, Pellets oder Werkstoffplatten |
| FI128437B (en) | 2016-08-18 | 2020-05-15 | Tm System Finland Oy | Method and arrangement for air recirculation in the drying process |
| CN110500877B (zh) | 2018-05-17 | 2021-07-13 | 迪蔼姆芬兰有限公司 | 用于调节潮湿排气的结构和方法 |
| DE102019114467B4 (de) | 2019-05-29 | 2026-05-07 | Voith Patent Gmbh | Verfahren zur Entschwadung von Prozessabluft |
-
2021
- 2021-01-28 DE DE102021101998.2A patent/DE102021101998A1/de active Pending
- 2021-12-21 WO PCT/EP2021/087027 patent/WO2022161709A1/de not_active Ceased
- 2021-12-21 EP EP21839228.0A patent/EP4284974B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| EP4284974B1 (de) | 2025-02-12 |
| EP4284974C0 (de) | 2025-02-12 |
| DE102021101998A1 (de) | 2022-07-28 |
| WO2022161709A1 (de) | 2022-08-04 |
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