EP3000932A1 - Device and methods for the treatment or provision of a basic material and production machine - Google Patents

Abstract

The invention relates to a device and a method for treating or providing a base material and a production machine. The production machine is associated with a turbine (1), wherein the turbine (1) provides both gas (G) with a reduced pressure (p1) and gas (G) with an increased pressure (p2) and optionally an elevated temperature (T2) , The gas (G) with a reduced pressure (p1) and the gas (G) with an increased pressure (p2) have a flow velocity (v1, v2). The gas (G) may serve to operate a jet pump to provide a reduced pressure (p1). The gas (G) of an elevated temperature (T2) can be used for drying a (cellulose-containing) material web (11). The gas (G) with the reduced pressure (p1) and / or the jet pump can be used to operate a dryer section (3a, 5a, TP), a press section (PP) and / or a (screen) cleaning device (3b, SP, SRP ) serve. Advantageously, the method and the device serve to save energy.

Description

The invention relates to an apparatus and a method for treating or providing a base material and a production machine.

The production of paper (as raw material) is an energy-intensive process. Especially in the drying process of the paper web, high amounts of hot steam and / or air are currently needed. The drying process of the paper web is therefore very energy-consuming. Furthermore, paper machines and other production machines require vacuum pumps to provide reduced pressure. The base paper is provided by pressing and then drying another base material, the pulp.

A way to describe the most efficient use of thermal energy in the production of paper describes DE 11 2011 103 779 T5 , This publication describes a drying box, wherein the drying box is divided into several areas and should lead to a separate supply of hot air into the individual areas to a higher efficiency. Thermal energy, in particular in the form of steam, is provided in the production of base materials, in particular in the production of paper, for example during a combustion process. Occasionally, the thermal energy thus generated is used to generate electrical energy.

Since much energy is still required for drying the paper web in the above-mentioned published patent application, it is an object of the invention to further increase the energy efficiency in the drying of a material web.

This object is achieved by a method according to claim 1.

This object is further achieved with a device according to claim 7.

This object is further achieved by a production machine according to claim 11

The further, dependent claims represent advantageous further embodiments of the method or the device.

• dass der verminderte Druck des Gases zur Unterstützung für zumindest einen ersten Prozess eingesetzt wird und
• dass der erhöhte Druck des Gases zur Unterstützung für zumindest einen zweiten Prozess eingesetzt wird.

To achieve the object is advantageously a method for treating and / or providing a base material, in particular a cellulosic material web, preferably the provision of paper from a pulp-containing ground substance (pulp), in particular in a paper machine, wherein a turbine both to provide a reduced pressure a gas as well as to provide an increased pressure of a gas. In this case, the method is characterized in that the turbine serves as a suction device (provision of a gas with reduced pressure) and / or as a blower (provision of gas at elevated pressure). The turbine also optionally provides gas at an elevated temperature. The method is further characterized

• that the reduced pressure of the gas is used to support at least a first process, and
• that the increased pressure of the gas is used to support at least a second process.

In an advantageous embodiment, an apparatus for providing and / or treating a base material, in particular for providing and / or drying a pulp-containing material web, preferably in a paper machine, a turbine, at least one dryer section, a Cleaning section (Siebreinigungspartie), a press section, a wire section and optionally further process units on. The turbine provides gas at an increased temperature and pressure for the dryer section. The turbine further provides gas at a reduced pressure for the wire cleaning section, to assist the press section, wire section, and / or optionally other process units. In other words, the turbine represents a heater, a vacuum pump and a blower.

Advantageously, the press section (or a filter section or wire section) can be supported by gas with a reduced pressure. A press section usually has a wet fiber fleece, which is replaced by a pick-up suction on the pressfile.

A production machine is understood here to mean a machine which, starting from a raw material, produces a base material or a product. Such a production machine may be a paper machine, a food processing machine, a baking machine, a waste processing machine, a raw material processing machine, or the like.

In this context, a turbine is understood to mean, in particular, a gas turbine, e.g. for generating electrical energy. The turbine may be part of a power plant associated with the production machine. Optionally, the turbine may also be part of a ventilation system, which is installed for the removal of process heat at a point of the production machine or the power plant.

The turbine is used as part of a power plant to convert a first form of energy, such as chemically bound energy, into a second form of energy, such as kinetic energy. The kinetic energy can then be converted into electrical energy.

A turbine regularly has an inlet, wherein gas (vapor, air) is sucked / introduced. A turbine also regularly has an outlet, wherein the gas sucked in through the inlet flows out / is discharged again.

At the entrance of the turbine there is a reduced pressure of the gas, in particular because the turbine sucks in the gas and at a resistance of the incoming gas, the pressure of the gas falls below a normal pressure.

Thus, a reduced pressure results as a pressure value of a gas which is below a normal pressure. Thus, there is an increased pressure, if the pressure is higher than the normal pressure. As normal pressure, for example, the prevailing atmospheric pressure of the environment (about 1 bar) can be selected.

At the outlet of the gas from the turbine, the gas usually has an elevated temperature. The elevated temperature can be a few Kelvin up to hundreds of Kelvin, depending on the function and design of the turbine.

The gas exiting the turbine may further assist in the provision of steam.

The flow rate of the gas through the turbine is usually very high. Therefore, by means of a jet pump from a high flow rate of the gas, a region of gas of reduced pressure can be generated. Advantageously, such a jet pump can be used both before the entrance of the turbine and after the exit of the turbine. At the inlet, the turbine sucks the gas into the turbine, thus reducing the pressure and generating the flow velocity of the gas. At the outlet of the turbine, the sucked gas is excreted again, ie, there is an increased pressure and a high flow velocity of the gas. In general, the temperature of the gas is increased after passing through the turbine compared to the incoming gas. Advantageously, the device as part of a production machine is well suited to reduce the energy consumption for the production of the product.

In an advantageous embodiment of the method, gas is provided at an elevated temperature by the turbine.

After passing through gas through a turbine, the gas usually has a higher temperature than at the entrance of a turbine. The heating of the gas takes place by waste heat of combustion, by friction and / or by adiabatic compression.

The elevated temperature gas may be used for processes such as aiding a dryer section, heating water and / or other base materials, or heating purposes. The gas at the elevated temperature may also be used to generate electrical energy, e.g. serve with the help of at least one other turbine. Such processes, which are assisted with gas of increased pressure, are also referred to herein as second processes.

In a further advantageous embodiment of the method, the reduced pressure is provided by means of a jet pump.

A jet pump generates a suction effect by means of a flowing gas, ie a reduced pressure. Due to the suction effect gas is provided with a reduced pressure by means of a gas flow resistance. Although the reduced pressure produced in this way may not be sufficient for a first process, the jet pump can also be operated with flowing gas which flows out at an outlet at the end of the turbine. An advantage of using a jet pump, which is operated with the outflowing gas of the turbine, is that the gas sucked in with the jet pump can not get into the turbine.

In a further advantageous embodiment of the method, the first process is a drying process, in particular a material web, the operation of a press section and / or a cleaning process, in particular a wire cleaning process.

As a first process and / or as a second process, the operation of a filter (e.g., a filter section) and / or a wire section may also be supported.

A drying process is the operation of a dryer section, a screening process is the operation of a wire section and a cleaning process is the operation of a screen cleaning process.

Applied to a paper machine, the drying process takes place in a drying section. The dryer section thermally removes residual moisture in the (cellulosic) web (web) to a desired final dry content. The screening process takes place in a wire section. A wire section or filter section generates from an (cellulose-containing) suspension an endless web, in particular the cellulose-containing material web. For ordinary Siebpartien it requires a reduced pressure, for example, to remove excess moisture. According to the prior art, vacuum pumps are used for this purpose which consume a large amount of electrical energy.

Furthermore, support of a constant component is possible as the first and / or second process. A constant component is understood to mean plant parts between the mixing vessel and the machine chest.

Furthermore, a press section with gas of reduced or increased pressure, in particular at an elevated temperature of the gas, is possible. For the screen cleaning process is used regularly a Siebreinigungspartie (also called Siebreinigungseinrichtung). A Siebreinigungspartie sprayed the filter with a liquid and sucks the liquid and possibly the contamination of the screen using vacuum pumps (reduced pressure) again. Also for a sieve cleaning section, according to the current state of the art, maintenance-intensive vacuum pumps are required.

Advantageously, energy can be saved by the application of the invention in a production machine, in particular a paper machine. In particular, as a replacement for vacuum pumps, the invention significantly reduces the energy consumption of a production machine.

In a further advantageous embodiment of the method, the second process is the loading of a cellulose-containing material web with the gas.

In particular, for drying a material web or for heating a material web, the admission of the material web with the gas, in particular the gas with an elevated temperature, is advantageous. This procedure can save considerable amounts of energy.

In a further advantageous embodiment of the method, the provision of the reduced pressure is effected by a jet pump.

A jet pump generates a reduced pressure by utilizing a flowing medium, here the flowing gas, driven by the turbine. Advantageously, a jet pump can be used to generate a reduced pressure in a wire cleaning section or in a wire section, wherein, if appropriate, impurities can not advantageously reach the turbine.

In an advantageous embodiment of the device, the device has at least one jet pump for providing the reduced pressure of the gas.

The jet pump can be operated both with the flowing gas that flows into the turbine, as well as operated in the flowing gas, which flows out of the same after the passage of the turbine. This means that the jet pump can be placed once before the entrance and / or after the exit of the turbine. If the jet pump is placed in front of the turbine, a filter may prevent the intake of sucked-in particles into the turbine.

By means of a jet pump, an existing production machine can be equipped to save energy.

In a further advantageous embodiment, the device has valves and a control device, wherein the control device is provided for controlling the valves and the control device controls the valves as needed of the at least one drying unit and / or the cleaning unit.

The control means serves e.g. for controlling the valves according to external specifications. The valves are connected to the control device. The controller controls via the opening of the valves the value of the reduced pressure for the first processes and the second processes which are supported. The outer specifications are advantageously based on a (current / determined) demand of the individual supported processes or lots (for example the dryer section).

The valves are controlled according to the needs of the processes, whereby the conversion of the first form of energy into the second form of energy is to be influenced only minimally by means of the turbine. The valves are therefore advantageously controlled and / or regulated in such a way that, given a defined influence, the turbine achieves the maximum energy savings achieved by supporting the processes.

FIG 1

ein Schema zur Einsparung thermischer Energie,

FIG 2

eine Trockenpartie als Teil einer Produktionsmaschine,

FIG 3

eine weitere Ausführung einer solchen Produktionsmaschine,

FIG 4

ein Schema einer Trockenpartie einer Produktionsmaschine sowie

FIG 5

eine Anwendung der Erfindung auf eine Papiermaschine.

The invention will be described and explained in more detail below with reference to FIGS. Of course, the person skilled in the art will be able to combine features which are shown in different figures in the usual way. Show it:

FIG. 1

a scheme for saving thermal energy,

FIG. 2

a dryer section as part of a production machine,

FIG. 3

another embodiment of such a production machine,

FIG. 4

a schematic of a dryer section of a production machine as well

FIG. 5

an application of the invention to a paper machine.

FIG. 1 shows a scheme for saving energy, especially thermal energy. Energy is needed in the manufacture and processing of a (cellulosic) web 11 to provide gas G (eg, in the form of vapor) and to provide a gas G with increased pressure p2 and to provide a gas G with a reduced pressure p1. Furthermore, energy is required for heating gas G, in particular air, which is used, for example, analogously to the use of steam, for drying a cellulose-containing material web 11.

In the illustrated embodiment, there is provided a turbine 1, in particular a gas turbine 1, for converting a first energy form E1 (e.g., chemically-bound energy) into a second energy form E2 (e.g., kinetic energy for generating electrical energy by means of a generator).

The turbine 1 has an inlet for the incoming gas G (eg for air or steam). The turbine 1 further has an outlet for the gas G. During operation, the turbine generates inflowing gas G of a flow velocity v1 and / or outflowing gas of a flow velocity v2. The gas G, which flows into the turbine 1, has a temperature T1. The gas which flows out of the turbine 1 has a temperature T2. The gas G usually has an elevated temperature T2 after flowing through the turbine 1, in comparison with the temperature T1 of the inflowing gas G. The gas G, which is moved through the turbine 1, serves to support first processes 3a , 3b, 3c, ... and second processes 5a, 5b, 5c, .... First processes are processes in which a gas flowing at a flow velocity v1 (entering the turbine) supports the process. For example, a suction effect can be used to transport liquids such as water. Further, a suction effect for receiving substances, in particular for cleaning a belt 9 or conveyor belt 9 serve. The gas G flowing into the turbine 1 contributes to the provision of the gas at a reduced pressure p1.

The value of the reduced pressure p1 of the gas here depends on the flow resistance of the inflowing gas G and the flow velocity v1 of the gas G.

The value of the increased pressure p2 of the gas here depends on the flow resistance of the outflowing gas G and the flow velocity v2 of the gas G.

Second processes 5a, 5b, 5c, ... are processes in which an increased pressure p2, in particular coupled with an elevated temperature T2 of the gas flowing with the flow velocity v2, assists. For example, when drying a (cellulose-containing) material web 11, an increased temperature T2 of the gas G is advantageous, so that moisture / a liquid evaporates faster.

Through the use of a jet pump P, a reduced pressure p1 can also be realized after the exit of the turbine 1, as shown in FIG FIG. 4 is shown.

The turbine may be located in a power plant, for example, associated with a paper machine and / or located in close proximity.

A first process 3a, 3b, 3c, ... is a process supported by the provision of gas G of reduced pressure p1. A first process 3a, 3b, 3c,... Can be a transport process, a cleaning process, the support of a press section or a (suction) process.

A second process 5a, 5b, 5c, ... is a process supported by the provision of gas G at an increased pressure p2. A second process 5a, 5b, 5c,... Can be a transport process, a drying process (operation of a dryer section in a paper machine), a cleaning process (in the case of a paper machine, in particular a screen cleaning process), or a process for generating electrical energy.

FIG. 2 shows a dryer section TP or a press section PP as part of a production machine, in particular as part of a paper machine. The turbine 1 is used to convert a first form of energy E1 to a second form of energy E2. The turbine 1 serves to transport a gas G. Before entering the turbine 1, the gas G has a speed v1, a reduced pressure p1 and a temperature T1. After the turbine 1, the gas G has an increased pressure p2, a flow velocity v2 and an elevated temperature T2. The prevailing before the turbine 1 reduced pressure p1 is used to support a first dryer section TP and / or press section. In this case, in the case of layer 12, in particular a water-containing layer 12, which acts on a (cellulose-containing) material web 11, is sucked off. The material web 11, in particular a paper web 11, is transported on a belt 9. If the belt 9 and the material web 11 are permeable to air, then a drying process 3a (by means of the first drying section TP) can also be dried by passing gas G. Optionally, foreign matter is removed from the flowing gas G by a new filtering device (not shown). For controlling the drying section TP, a valve 6 is used.

After the turbine 1, the gas has a flow velocity v2, an increased pressure p2 and an elevated temperature T2. A portion of the gas G, which is present with the increased pressure p2 and the elevated temperature T2, serves to support a second drying process 5a by means of a further drying section TP. In the second drying process 5 a, part of the gas G leaving the turbine 1 is directed onto the (cellulose-containing) material web 11. Here, the (cellulose-containing) material web 11, which runs on the belt 9, dried by the interaction with the gas G. Further second processes 5b, 5c,..., In particular processes for papermaking, can also be assisted with the gas G flowing out of the turbine 1. For example, by means of the gas G water can be heated and thus the provision of water vapor can be supported. The gas G emerging from the turbine 1 can also serve to generate electrical energy. Another first process 3a may be the support of a sieve cleaning section SRP. Valves 6 are advantageously used to distribute the gas G. The valves are connected to a control device 7. The control device 7 controls the intensity of the first processes 3a, 3b, 3c,... And / or the second processes 5a, 5b, 5c, 5d,.

FIG. 3 shows a further embodiment of a production machine, in particular a paper machine.

In this embodiment, a first dryer section TP and a screen cleaning section SRP are shown. In the figure, the first dryer section TP is shown by the same functionality as a press section PP, the press section PP being assisted by the gas G with reduced pressure p1. Furthermore, a second drying section TP is shown, wherein the second drying section TP can also be characterized by the use of heated rollers. The one drying section TP, as a first process 3a, is reduced by gas G of one Pressure p1 supported. The gas G with the reduced pressure p1 is provided by a jet pump P.

Although not shown, the direct support of the first processes 3a, 3b, 3c, ... or the Siebreinigungspartie SRP, the wire section SP and / or a press section PP with the aid of, in the turbine 1 inflowing gas G (with the reduced pressure p1) possible.

Another first process 3b is the cleaning of the belt 9, on which the (cellulose-containing) material web 11 usually runs. Such a process is also referred to as a screen cleaning process SRP in the area of a paper machine.

In the sieve cleaning section SRP, the web 9 is charged with water (H2O) and sucked off again by means of a gas G with a reduced pressure p1. In this case, if present particles are removed from the belt 9

In general, the cleaning process 3b is then carried out if the web 9 is not acted upon by a (cellulose-containing) material web 11.

The control of the intensity of the first processes 3a, 3b is effected by valves 6. The reduced pressure p1 can be adjusted so that the drying section 3a, TP and / or the screen cleaning unit 3b, SRP function optimally.

The turbine further provides gas G having an increased pressure p2 and an elevated temperature T2 for at least a second process 5a, 5b, 5c,. As a second process 5a, 5b, 5c,..., A further drying process 5a (a drying section TP by means of gas-flowed rolls) for the (cellulose-containing) material web 11 is shown on a belt 9. Here, the gas G, in particular as a form of water vapor G, fed to two drying cylinders. The drying cylinders as part of the dryer section TP act on the belt 9 and / or the (cellulose-containing) material web 11 and dry the (cellulose-containing) material web 11th

The portion of the gas G sufficient to support the dryer section TP is controlled / determined by the valve G. For example, based on a specific moisture content of the (cellulose-containing) material web 11, the supply of gas G controlled by means of the valve 6 and the control device 7 (not shown) are controlled.

Likewise, by monitoring the belt 9, cleaning of the belt 9 can be controlled by means of a screen cleaning section SRP (not shown) on the basis of the corresponding valve 6. Thus, in particular, the cleaning of the belt 9 can take place when the belt is not loaded with the (cellulose-containing) material web 11.

Advantageously, the sieve cleaning section SRP and / or the drying section TP is a separator, in particular a water separator, arranged downstream. Such a water separator can be arranged below the drying section TP, but is in the FIG. 3 indicated only by a section of a pipe.

The turbine 1 may be part of a power plant associated with the production machine for generating electrical energy. As (pulp-containing) material web 11 may be a paper web before drying or after pressing.

FIG. 4 shows two different patterns of drying sections TP for a product strip 11. Also shown is a turbine 1, at the outlet of which the gas G exits with an increased pressure p2, a flow velocity v2 and an (elevated) temperature T2 and through a pipeline of further second processes, the shown drying processes 5a, 3a, is fed. By the flow velocity v2 of the gas G, gas with a reduced pressure p1 can be provided by means of a jet pump P. A portion of the gas G is supplied after exiting the turbine 1 of a first drying section TP. In the first drying section TP, the gas G with the elevated temperature T2 is directed onto the (cellulose-containing) product band 11 to be dried and serves to remove the moisture of the material web 11 by supplying heat and gas flow.

In a further drying section TP, the moisture present on / in the (cellulose-containing) material web 11 is sucked off by means of the jet pump P. Such a procedure ensures that no water or other contamination can enter the area of action of the turbine 1.

FIG. 5 shows an application of the invention to a paper machine. The paper machine has, among other units and parts, a wire section SP, a wire-cleaning section SRP, a press section PP and at least one dryer section TP. The (cellulose-containing) material web 11 passes through first the wire section SP, the press section PP and then the drying section TP.

The wire section SP and / or the screen cleaning section SRP is filled with a gas G of reduced pressure p1, i. supported with a suction effect. The gas G then passes through the turbine 1, possibly in mixture with another gas G from the environment. In the turbine 1, the gas G is possibly provided with an increased pressure p1. The gas G, which leaves the turbine 1, usually has an elevated temperature T2. The gas G, which enters the turbine 1, has a flow velocity v1 and a temperature T1. The gas G leaving the turbine has a flow velocity v2 and an increased pressure p2.

The gas G at the elevated temperature T2 exiting the turbine serves to support the dryer section TP. In the drying section TP, the gas with the increased temperature T2 and / or the increased pressure p2 and / or the flow velocity is used v2 for loading the (cellulose-containing) material web 11, which is transported on the belt 9.

Furthermore, the press section PP is advantageously supported by gas G with a reduced pressure p1. As described above, a press section has a pickup suction. The vacuum cleaner usually requires a supply of gas G with a reduced pressure p1. The gas G with the reduced pressure p1 can be provided either by means of the jet pump P or directly through the turbine 1.

By means of a jet pump P, the gas G can also contribute to the outlet of the turbine 1 to support the Siebreinigungspartie SRP and / or to support the wire section SP.

The turbine 1 is advantageously located in a power plant for generating electrical energy E2. Thus, an adjacent localized power plant is particularly advantageous in a paper machine.

In summary, the invention relates to a method and apparatus for treating a base, e.g. Paper and a production machine. The production machine is associated with a turbine 1, the turbine 1 providing both gas G with a reduced pressure p1 and gas G with an increased pressure p2 and possibly an elevated temperature T2. The gas G with a reduced pressure p1 and the gas G with an increased pressure p2 in this case has a flow velocity v1, v2. The gas G may be used to operate a jet pump to provide a reduced pressure p1. The gas G of an elevated temperature T2 can serve for drying a (cellulose-containing) material web 11. The gas G with the reduced pressure p1 and / or the jet pump can be used to operate a dryer section TP, 3a, 5a, a press section PP and / or a (wire) cleaning section SRP. Advantageously, the method and the device serve to save energy.

Claims (11)

Method for treating or providing a base material, in particular a cellulose-containing material web (11), wherein a turbine (1) both for providing a reduced pressure (p1) of a gas (G) and / or for providing an increased pressure (p2) of a gas (G), characterized - That the reduced pressure (p1) of the gas (G) is used to support at least a first process (3a, 3b, 3c, ...), and - That the increased pressure (p2) of the gas (G) to support at least a second process (5a, 5b, 5c, ...) is used. A method according to claim 1, characterized in that the turbine (1) serves both to provide a reduced pressure (p1) of a gas (G) and to provide an increased pressure (p2) of a gas (G). Method according to claim 1 or 2, characterized in that gas (G) with an elevated temperature (T2) is provided by the turbine (1). Method according to one of the preceding claims, characterized in that the reduced pressure (p1) is provided by means of a jet pump (P). Method according to one of the preceding claims, characterized in that the first process (3a, 3b, ...) a drying process (3a), in particular a material web (11), the operation of a press section and / or a cleaning process (3b), in particular a screen cleaning process (3b). Method according to one of the preceding claims, characterized in that the second process (5a, 5b, 5c, ...) is the loading of a pulp-containing material web (11) with the gas (G). Device for treating or providing a base material, in particular for producing or treating a pulp-containing material web (11), preferably in a paper machine, comprising a turbine (1), at least one dryer section (TP), a cleaning section (SRP), in particular a wire-cleaning section ( SRP), and optionally further processing units, in particular a press section (PP) or wire section (SP), wherein at least to support the cleaning section (SRP) and / or the dryer section (TP) the provision of gas (G) with an increased pressure (p2 ), a reduced pressure (p1) and / or an elevated temperature (T2) is provided, characterized in that the turbine (1) for providing the reduced pressure (p1) of the gas (G) and / or the provision of the increased pressure (p2) of the gas (G) is provided. Apparatus according to claim 7, characterized in that the turbine (1) for providing the gas (G) with reduced pressure (p1) and for providing the gas (G) with an increased pressure (p2) and optionally to provide the gas with elevated temperature (T2) is provided. Apparatus according to claim 7 or 8, characterized in that the device comprises at least one jet pump (P) for providing the reduced pressure (p1) of the gas (G). Device according to one of claims 7 to 9, characterized in that the device valves (6) and a control device (7), wherein the control device (7) for controlling the valves (6) is provided and wherein the control device (7) for Actuation of the valves (6) as required by gas (G) increased temperature (T2), reduced pressure (p1) and / or increased pressure (p2) of the at least one dryer section (3a, 5a, TP) and / or the cleaning section (3b , SRP) is provided. Production machine, in particular for producing a pulp-containing base material, preferably a paper machine, comprising a device according to one of claims 7 to 9.

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