FI121947B - Apparatus and method for operating a fiber web machine - Google Patents

Description

ORGANIZATION METHOD FOR USE OF A URBAN ACCOUNT FIELD OF THE INVENTION

The invention relates to the use of a fiber web machine such as a paper, board, tissue or pulp machine. In particular, but not exclusively, the invention relates to the energy supply of rotary drives for rolls of a fiber web machine and similar fiber web processing means.

BACKGROUND OF THE INVENTION

As the yield requirements for fiber web machines increase, the fiber web is produced with wider and faster fiber web machines. Production efficiency requirements have traditionally been solved by increasing the running speed and production width of the fiber web machine and finishing equipment. In this case, the equipment has to be dimensioned so that the structures of the equipment become very heavy. Due to the weight of the rotary fiber machine machine components, rotary drives, gears, power supplies, feed network and other actuators also need to be dimensioned large and expensive to achieve reasonable acceleration times. The rotary machines of the fiber web machine 20 include, for example, rolls, fabrics and belts rotatable with their rotating members, and machine rolls. For example, accelerating full machine rolls with a roller blade or a winder requires a very high peak power momentarily.

Rotation drives and power supply devices for rotary drives are dimensioned o 25 for maximum acceleration power. The energy supply means for rotary drive 4 are e.g. voltage supply network, mains voltage AC-DC converter and g rotary drive DC-AC converter. For example, for fast x accelerations, the rated power requirement for rotary drive is 1.5-3 times greater than

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power requirement at constant speed of rotation drive. In this case, the voltage supply network, ^ 30 AC-DC converter and DC-AC converter supplying the rotation drive must be dimensioned 1.5-3 times larger than the standard operation required for the rotation drive.

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US 2003024672 A1 discloses a method and arrangement for treating a wide web of paper or board. In the publication, the efficiency requirements are solved by dividing the wide web into sub-webs at least once before the final post-processing step, whereby the sub-web can be processed with narrower 5 devices.

SUMMARY

According to a first aspect of the invention, there is provided an arrangement according to claim 10 for operating a fiber web machine.

The energy storage may comprise at least one capacitor and / or the energy storage may comprise at least one electrochemical battery.

Preferably, the electrical energy is stored in DC form. The voltage difference of electric energy may vary depending on the level of energy storage.

The arrangement may comprise a DC-AC converter as a means for controlling and regulating the electrical energy through which the electrical energy can be controlled from the rotation drive to the energy storage and through which the electric energy can be controlled from the energy storage to the rotation drive.

The DC-AC converter connected to the energy storage may be a separate DC-AC converter than the DC-AC converter connected to the supply network. o 25 The DC-AC converter connected to the power supply may be the same DC-AC-4 converter as the DC-AC converter connected to the supply network.

Preferably, the drive is driven with a standard drive power, and the feed network may comprise

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dimensioning corresponding to 5 - 20% above the standard drive power of the rotary drive. Preferably, the constant drive power 30 corresponds to the rotational power at a constant speed of the rotatable processing member o.

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Preferably, the rotary drive has a maximum power output, and the power requirement of the rotary drive 3, which exceeds the dimensioning of the supply network, may be arranged to be covered by the electrical power supplied from the energy storage. Preferably, the maximum operating power corresponds to the rotational power at the maximum acceleration of the rotatable processing member.

The AC-DC converter may comprise a power dimensioning corresponding to 5 to 20% above the standard operating power of the rotary drive.

Preferably, the rotary drive has a maximum drive power that can be dimensioned by a DC-AC converter or by separate DC-AC converters.

10

Preferably, the rotary drive has a maximum drive power, which may be 1.5 to 3 times the standard drive power of the rotary drive.

The arrangement may comprise a power transmission means for implementing a power coupling between a rotary drive and a fiber web processing member 15.

According to another aspect of the invention, there is provided a method according to claim 11 for operating a fiber web machine.

In the method, the electric energy released from the energy storage can be converted by the DC-AC converter into the rotational energy of the rotation drive in the case of acceleration of the rotation drive.

In the method, the AC-DC converter and the DC-AC converter can be adjusted so that they adapt to the changing voltage level of the energy storage.

0 g The invention makes it possible to use a supply network for supplying energy to rotary motors 1 and AC-DC converters for supplying electricity from which

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the required input power is less than the maximum power of the rotary motors ^ 30 would require using only the power supply network as the power source. Then, the power supply apparatus comprising the supply network can be formed from smaller C \ | components other than supplying the maximum power of the rotary motors with power supply alone would require. Thus, the capital and operating costs of the individual components of the supply network 4 and of the entire supply network can be reduced.

By using an energy store for rotary drive, which is preferably 5 local, the driving dynamics of a single rotary drive are improved. The intermittent maximum power demand of the rotation drives in the direction of the feeder network can be reduced, which allows for a smoother operation of the feeder network.

In addition, or alternatively, the existing feed network and its components 10 may be used to power the larger rotary drives and / or the dynamic driving characteristics of the rotary drives in driving situations may be increased. According to some embodiments, the rotary drives can be accelerated faster than previous acceleration drives. If higher rotation drives are desired, the power supply capacity of the feeder network may still be sufficient, and the feeder network may not be subject to further interference despite the increased maximum power requirement of the rotary drive.

Various embodiments of the present invention will be described or described only in connection with some or some aspects of the invention. One of ordinary skill in the art will recognize that any embodiment of 20 aspects of the invention may be applied to the same and other aspects of the invention, alone or in combination with other embodiments.

BRIEF PRESENTATION OF THE PATTERNS

The invention will now be described, by way of example, with reference to the accompanying drawings, in which: Fig. 1 is a diagrammatic view of a known rotary drive of a fiber web machine.

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from power supply, the power supply for the rotation drive is powered by the power supply network ^ 30.

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Figures 2 and 3 are schematic diagrams of power supplies for rotary drive of a fiber web machine according to some embodiments of the invention, when the power source for rotary drive 5 is provided from an energy reserve based on electrical energy stored in capacitors.

DETAILED EXPLANATION

In the following description, like reference numerals refer to like parts. It is to be noted that the figures shown are not to scale in their entirety, and that they serve merely the purpose of illustrating embodiments of the invention.

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Fig. 1 is a diagrammatic view of the known energy supply of the rotary drive 1 of the papermaking machine roll 3 when the power supply network 2 is used as the energy source for the rotary drive 1.

In Figure 1, the hardware components comprising the feed network 2 are dimensioned to meet the maximum power required by the rotation drive 1. Supply network 2 comprises electrical supply cabling, switching, switches, safety devices or the like hardware components for supplying mains electricity for rotation drive 1. The rotary drive 1 can be used to rotate a rotatable machine part 3, 20 of a fiber web machine, which may be, for example, a fiber web handling roll or an endless belt or reel roll handling a fiber web or a reel core or printing roll. The maximum power requirement Pmax for rotation drive 1 may be three times greater than the constant power Pconst required for roller 3 in standard operation of the papermaking machine. One rotating δ 25 machine part of a fiber web machine with a high braking and acceleration mass is a thermal roller.

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o g In order to transmit the rotational energy to the machine element rotatable from the transmission shaft of the rotation drive 1, the transmission means 6 is used. The rotation drive 1 is connected to the roller 2 via the transmission means 6. The transmission means 6 comprise, for example, a shaft coupling and / or a transmission and / or a separate transmission shaft.

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In Figure 1, the supply network 2 supplies the operating energy required by the rotation drive 1 as a mains voltage to the AC-DC converter 4 and further to the DC-AC converter 5, 6 from which the operating energy is suitably converted to drive rotation 1. The AC-DC converter 4 and can form a drive. In order to provide fast accelerations, in the example of Figure 1, the maximum power requirement P max of the rotation drive 1 is dimensioned to be three times the constant power requirement Pconst at the constant speed of the drive drive 1. As shown in Figure 1, the power transmission capacity of the supply network 2 is dimensioned to be the maximum power requirement P max of the rotation drive 1. Correspondingly, the AC-DC converter 4 and the DC-AC converter 5 which supply the rotation drive 1 with a controlled voltage are dimensioned three times larger than the standard operation of the rotation drive 1, i.e., the maximum power requirement P max of 10 drives.

Figures 2 and 3 are diagrams showing arrangements according to some embodiments of the invention for operating a fiber web machine. The fiber web machine comprises at least one rotatable processing member for handling the fibrous web, and a rotation apparatus 15 for rotating the fibrous web processing member. The rotation apparatus comprises at least one rotary drive. The energy supply of the arrangement is implemented in part by a supply network which acts as a power source for the rotation apparatus.

In the method of operating the fiber web machine, in particular to accelerate and decelerate the rotary drive, the arrangement described with reference to Figures 2 and 3 can be used. The arrangement and method can achieve many advantages, e.g. the fiber web manufacturing process can be dynamically controlled without interfering with the feeder grid 2.12 at peak loads.

In Fig. 2, the rotation apparatus comprises a rotary drive 1 and a power switch 6 4 for transmitting rotational power to a rotatable machine part of the fiber web machine, which in the case of Fig. 2 is a machine roll 3 '. The rotation apparatus accelerates, rotates x and retards the machine roll 3 '. The rotation apparatus further comprises electrical power control Q_ and adjusting means for making the electrical energy from the supply network 12 ^ 30 of the AC-DC converter 14 and the DC-AC converter 5 utilized in the rotation drive 1, and in some cases the rotation drive 1 may be directly connected to

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to a rotatable machine part 3,3 'without separate transmission means 6.

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Preferably, the rotation apparatus comprises an energy store 7, implemented by capacitors C, arranged in an energy supply arrangement in addition to the power supply network 12. Capacitors C can achieve a long-lasting energy charge 7, since in capacitors C the energy is bound by the charges between the conductor pieces 5 and the charge retention is not based on electrochemical reactions. The capacitors C can be discharged and charged repeatedly and in short cycles, so that their properties can be utilized in the driving mode of the rotary drive 1, in which the rotary drive 1 is repeatedly slowed down and accelerated.

According to some embodiments, the energy reserve 7 may comprise at least one electrochemical battery. An electrochemical battery can achieve a high energy density to be stored and a longer energy storage time compared to capacitor technology. According to some embodiments, the energy reserve may comprise a combination of an electrochemical battery and a capacitor.

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The motion energy of the rotatable mass can be directed by the rotary drive 1 through the DC-AC converter 5 to be stored in the energy storage 7 as electrical energy. Electrical energy can be generated by means of the rotation of the rotatable mass of one 3 'of the rotation during deceleration the use of one (two-way direction of the arrow D). DC-AC converter 5 to 20 is used and electric power control means for adjusting the feeding electric energy from the energy store 7 the use of the rotating machine, for example, one roller 3 'is the acceleration (a two-way direction of the arrow A). Preferably, the energy storage 7 is implemented locally in the vicinity of the DC-AC converter 5, whereby a short energy transfer cabling between the energy storage 7 and the DC-AC converter 5 is accomplished.

The arrangement of FIG. 2 is implemented in a manner different from the energy supply arrangement of FIG.

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The example of Fig. 2 illustrates that only part of the maximum power demand Pmax of the rotary drive 1 is used for the supply network 12 capacity 8, whereupon, if necessary, the power network capacity can be utilized elsewhere or the undisturbed and stable operation of the power network 12 is improved.

A plurality of capacitors C may be connected to act together as an energy storage 7. The energy storage 7 may store the braking energy generated by the rounding drive 1, i.e. the rotating mass 3 ', by slowing down the kinetic energy to be recovered. Energy storage 7, preferably at least one of the capacitor C is controlled by the DC-AC converter 5 via a (in the direction of AC - DC, two-way 10 the arrow direction D) to storage means of the rotation motor a DC-AC converter 1 and 5 of the recovered kinetic energy of the rotatable fiber-web machine, machine element 3 'when braking.

7 stored in the energy storage of electrical energy may be necessary to make the guide 15 and the DC-AC converter 5 via a (in the direction of DC - AC, a two-way direction of the arrow A) of rotation of the engine 1, for use, in particular a rotatable fiber-web machine, the machine body 3 'is accelerated. The electrical energy supplied from the energy storage 7 to the DC-AC converter 5 with power PS can be used to cover the difference between the power required by the rotation drive 1 and the power P1220 supplied through the supply network 12 and to provide the frequency-varying electrical power (<P12 + PS).

In the arrangement of Fig. 2 for operating a fiber web machine, the feed network 12 is able to provide, in addition to the power Pconst o 25 required by the rotation drive 1 at constant speed, the power capacity PL preferably for reserving the energy store 7. In the preferred dimensioning example shown in Figure 2 4, the power transmission capacity P12 i g of the supply network 2 is dimensioned to be 5% to 20% above the constant power requirement Pconst x of the rotation drive 1 (e.g. Pconst + PL = P12). If necessary, rotation with 1 constant power

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when used, it is possible to simultaneously charge the energy storage 7, preferably ^ 30 capacitors C.

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In the example of Figure 2, the supply network 12 is capable of supplying the required power Pconst of the rotation drive 1 at a constant speed as the mains voltage to the AC-DC-9 converter 14 rated for power supply capacity P12 of the supply network 12. From the AC-DC converter 14, the drive power is further transmitted to the DC-AC converter 5, from which the driving energy required for rotation drive 1 is suitably converted to drive rotation 1. In the example of FIG. 2, the DC-AC converter 5 is rated to max.

In some cases, power from the supply network via the AC-DC converter may be supplied through the first DC-AC converter to the rotary motor, and a second DC-AC converter (not shown) may be used for bidirectional energy transfer between the energy store and the rotary motor.

In Fig. 2, a machine roll 3 'is shown as a rotatable machine member for slowing and accelerating a fiber web machine, for example, in a roller winding position 15 or in a winder unwinding position.

The rotary fiber machine machine member may also be a winding core in a winder, on which a customer roll to be rolled is formed from a longitudinally cut web. The rotary fiber machine machine member whose rotational energy is captured by the rotation drive 1 in the braking step into the energy storage 7 and returned to the rotational energy from the energy storage 7 by the rotating drive 1 in the acceleration step may also be a winder press roll. The energy storage 7 provided by the capacitors C can thus be used in the fiber web machine as an acceleration aid for the rotary drive 1.

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4 In order to provide fast accelerations, the maximum power requirement Pmax of the rotation drive of 1 g can be met by supplying the DC-AC converter 5 x with the input power P12 of the supply network 12 combined with the energy storage 7,

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preferably to the electric power PS released from the capacitors C.

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o The maximum power demand Pmax for rotation drive 1 is in the case of Fig. 2 is as in Fig. 1

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corresponding to the situation, i.e., Pmax is rated at three times the constant power requirement of Pconst at constant speed of rotation drive 1. In the example of Figure 2 10, the supply network 12 and the AC-DC converter 14 are preferably sized 1.05 to 1.2 times the standard rotation of drive 1.

In FIG. Thus, the capital and operating costs of the individual components of the supply network 12 and of the entire supply network 12 can be reduced.

Figure 3 illustrates a situation where, for example, an existing feed network 2 with its components is used to supply energy to a larger rotation drive 11 connected to the previous rotation drive 1 connected to the feed network 2. A larger rotary drive 11 can be used because, for example, the rotatable mass 3,3 'has increased and / or the rotatable mass is to be accelerated more rapidly. With reference to the description of Figure 3, reference is also made to the description of Figure 2.

A DC-AC conversion corresponding to the maximum power requirement 20 of P max for rotation drive 11 is provided with a DC-AC converter 15 greater than that shown in Figure 1. acceleration situation. Additional power capacity to cover the maximum power demand Pmax of the rotation drive, for example in the case of acceleration o 25, can be obtained from the energy storage 7, where the electrical energy generated when the rotatable roller 4 3 is retarded. The dynamic runnability of the fibrous web process of spinning drive 11 and g can be improved. The interference caused by the feeder network 2 in the x direction can be reduced and a more stable feeder network 2 can be provided. Higher rotation drive 11 does not require costly investments to increase the capacity of the feeder network 2. When slowed down, energy can be collected and reused.

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11 By using the energy storage for spinning, the driving dynamics of the spinning drive and thus the driving dynamics of the fiber web manufacturing process are improved. The energy storage can be used as a source of supply for dynamic changes in the rotation drive. The intermittent maximum power demand of the rotation drives in the direction of the supply network 5 can be arranged to be smaller, which allows for a more undisturbed operation of the supply network.

The foregoing description provides non-limiting examples of some embodiments of the invention. However, it will be apparent to one skilled in the art that the invention is not limited to the details set forth, but that the invention may be practiced in other equivalent ways.

Some features of the embodiments shown may be utilized without the use of other features. The foregoing description is to be construed as merely describing the principles of the invention and not limiting it. Thus, the scope of the invention is limited only by the appended claims.

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Claims (12)

12 An arrangement for operating a fiber web machine, the fiber web machine comprising a rotatable processing member (3,3 ') for treating a fibrous web (W), and comprising: a rotary apparatus for accelerating, rotating and decelerating a rotatable processing member (3,3'); 1) arranged in a power transmission connection with a rotatable manipulation member (3,3 ') and adapted to generate electrical energy from the kinetic energy of the rotatable manipulation member (3,3') in the deceleration drive (D) of the rotary drive (1); and the AC-DC converter (4,14) and DC-AC converter (5,15) interconnected as electrical energy control and regulating means for supplying electric energy from the electric power supply network (2) to the rotational energy of the rotation drive (1), characterized in that: the arrangement comprises an energy storage (7, C) adapted locally adjacent to the DC-AC converter (5,15) for a single rotation drive and storing in DC form and to supply the same rotary drive (1,11) for rotational energy (A) with electric energy formed in the deceleration mode by the same energy of motion of the same rotatable manipulation member (3,3 '); and, in the arrangement, the electrical energy is adapted to be controlled in deceleration mode from the same rotation drive (1,11) through the DC-AC converter (5) to the energy storage (7) to be stored in DC form and the electric energy stored in DC form Through the AC-4 converter (5), the same rotation is used to drive Ie (1.11), and the power supply capacity of the ig supply network (2) is 1.05 to 1.2 times the rotary drive (1.11) x the standard drive power (Pconst), greater than 1.05 CL - 1.2 times the standard drive power of the rotary drive (1.11), is arranged to cover ^ 30 of the electric power (PS) released from the energy storage (7), and has a maximum drive power (Pmax) of 1.5 to 3 times the standard power. (M Arrangement according to Claim 1, characterized in that the 13 energy reserves (7) comprise at least one capacitor (C). Arrangement according to Claim 1 or 2, characterized in that the energy reserve (7) comprises at least one electrochemical battery. 5 Arrangement according to Claim 1, characterized in that the DC-AC converter (5) connected to the energy store (7) is a separate DC-AC converter from the DC-AC converter connected to the supply network (2,12). Arrangement according to Claim 1, characterized in that the DC-AC converter (5) connected to the energy storage (7) is the same DC-AC converter as the DC-AC converter (5) connected in the direction of the supply network (2,12). . Arrangement according to one of Claims 1 to 5, characterized in that the 15 rotary drives (1,11) have a standard drive power (Pconst), and the supply network (2,12) comprises a dimensioning (Pconst + PL) corresponding to 5-20% over the rotary drive. standard power (Pconst). An arrangement according to claim 6, characterized in that the rotation drive (1,11) is dimensioned for maximum power (Pmax) and the power requirement of the rotation drive (1,11) which exceeds the dimensioning (Pconst + PL) of the supply network (2,12), is arranged to be covered by electrical power (PS) from the energy storage (7). Arrangement according to one of Claims 1 to 7, characterized in that the AC-DC converter (14) comprises a power dimensioning (Pconst + PL) corresponding to 5-20% 4 over the standard driving power (Pconst) of the rotary drive. 0 Arrangement according to one of Claims 1 to 8, characterized in that the Q_ rotation drive (1,11) is dimensioned for maximum power (Pmax) corresponding to a dimensioning DC-AC converter (5) or comprising separate DC-AC converters. . LO '' 01 o o CM Arrangement according to one of Claims 1 to 9, characterized in that the rotary drive (1,11) is designed for a maximum drive power (Pmax) of 1.5 to 14 times the standard drive power (Pconst) of the rotary drive (1.11). A method of operating a fiber web machine comprising a rotatable processing member (3,3 ') for treating a fiber web (W) and 5 rotating apparatus for accelerating, rotating and decelerating a rotatable processing member (3,3'); comprising a rotary drive (1) arranged in a power transmission connection with a rotatable manipulation member (3,3 ') and generating 10 electrical energy in the deceleration drive (D) of the rotary drive (1) by the motion of the rotatable manipulating member (3,3'). and the rotary apparatus comprising electrical energy control and control means interconnected by an AC-DC converter (4,14) and a DC-AC converter (5,15) for supplying electrical energy from the supply network (2) to the rotational energy of the rotation drive (1). that method storing with the rotation drive 15 (1,11) an energy storage (7, C) arranged in an energy transfer connection, locally arranged near the DC-AC converter (5,15) for a single rotation drive, in the form of DC electric energy generated in the deceleration drive (D). the kinetic energy of the same rotary drive (1,11) rotatable by the same rotary drive (1,11), and the rotary drive and acceleration drive 20 of the same rotary drive (1,11) supply DC electrical energy from the energy storage (7, C) of the rotary drive (1,11) ) into rotational energy (A), and directing electric energy in deceleration operation from the same rotary drive (1,11) through said DC-AC converter (5) to energy storage (7) for storage in DC form and directing electric energy stored in DC form in acceleration mode o 25 energy storage (7) DC Through -AC converter (5) for same rotation use 11e 4 (1,11), and ig feed network (2) has power transmission capacity of 1.05-1.2 times rotation drive (1,11) x standard power (Pconst) and rotary drive power greater than 1,05 CL - 1,2 times the standard drive power of rotary drive (1,11) is covered by the power supplied from the energy storage (7) ^ 30, PS, and the maximum drive power (Pmax) of the rotary drive is o 1.5-3 times the standard drive power. (M 5 15 Method according to Claim 11, characterized in that the AC-DC converter (4,14) and the DC-AC converter (5,15) are adjusted to adapt to the changing voltage level of the energy storage (7, C). δ (M sj- o sj- o X en CL O CD sj- m O) o o {M 16