DE102012002249A1 - Speed dryer for drying e.g. textiles, has supply air fitting comprising pipeline units for limiting draft fan through high pressure and flow losses in narrow cross-sections for increasing retention time of air flow in rotatable drum - Google Patents

Abstract

The dryer (2) has a rotatable drum (7) for treating drying goods e.g. textiles, laundry or textile coated mats, and for drying the goods by heated air flow. The drum is connected with an intake port of a ventilator (8). A supply air fitting (3) comprises pipeline units for limiting an induced draft fan through high pressure and flow losses in narrow cross-sections for increasing retention time of the air flow in the drum and for increasing heat and material exchange from air to the goods. A volume controller (5) is arranged in the supply air fitting. An independent claim is also included for a method for drying in a speed dryer.

Description

The invention relates to a cycle dryer with a rotatable drum for dry material, according to the preamble of claim 1 and a method for final drying of dry material in a cycle dryer according to claim 9.

State of the art

About the convective drying of moist dry material, which is in a row in a drying chamber, designed as a rotary tube, treated as well as the heat demand determination is known that air for heating the dry material, for the evaporation of moisture and downstream for the further heating of the dry material a final temperature is used, wherein in the latter heating a post-evaporation of residual amounts of H ₂ O in this last stage is possible and according to the stepwise treatment, the energy requirement of the specific heat c _p (kcal / kg ° C) of the dry material and adhering Humidity, H ₂ O and determined by the heat of evaporation r _H2O (kcal / kg). Further, ways of operating these commercially available dryers are known that a saving of energy in the execution of the drying is achieved, in particular savings, which result from the fact that in the convective drying less energy is blown into the environment.

Further, energy-saving measures of these dryers in achieving the final drying are known in such a way that the temperatures are determined within the dryer and the supply of energy is stopped with the achievement of a certain temperature on the product.

The invention relates to cycle dryers for dehydrated dry goods and with the temporal sequence of treatment of the dry material and with a ventilation design of the dryer, the planning and installation of ventilation measures, so that in these dryers less energy is lost, the energy needs goes back, and energy is saved. A further object is that the savings achieved are documented as diagnosed CO ₂ free energy and balance sheets.

A clothes dryer and a method for controlling the heating power during the drying of laundry are from the document DE 103 02 973 known. In this exhaust air dryer, the heat output is controlled as a setpoint by the energy input depending on a degree of humidity. In the course of drying and the drop in the degree of moisture from 80% to a value of 20% in the drying area, the heating power is reduced. This can be a post-drying of the laundry done with a reduced energy task. This drying is associated with the disadvantage that only the task of energy is reduced to the convective heat transfer medium (air) from the moisture level of 20%.

Disadvantage is that the heat dissipation, expressed as enthalpy change Δi (kJ, kcal) specifically per kg air Q _wL = kg _air × Δi; decreases during the drying process.

Disadvantage is that the need for energy is not reduced; Disadvantages are, high energy consumption and poor utilization of energy.

It is namely in the convective drying so that at a lower heat output to transfer the heat a smaller amount of air is needed. Accordingly, too much air is used for the convective after-drying. Accordingly, the specific losses and the heat content per kg of exhaust air Q _wL = kg _air × i; unchanged high. Disadvantage is: the energy remains in the air.

Disadvantage is the low heat dissipation from the air in the dryer. Another disadvantage: high energy losses (g _air × i) in the hot exhaust air and high energy costs.

An exhaust air dryer with air as a resource, which is used tailored to the actual needs, is from the document DE 10 2008 049 034 known. In this dryer, the demand for air is diagnosed by a FIC diagnosis located in the air ducting system for air. The air volume is indicated by a volume flow controller with the function FIC - Flow Indication Control - ie with an indication of the volume and the control. This volume control is done over the duration of the drying and is disadvantageously associated with a constant volume of air over the time of drying.

The disadvantage is the constant supply of air over the time sequence and the lack of distinction in the process, especially in the time of drying and the heating of the dry material.

Disadvantage is a high consumption for heating the amount of air over the duration of drying and high energy costs.

It is the case that in the course of the drying and just in the heating phase during the after-drying, a smaller heat requirement is required over a period of time, while the amount of air after the DE 10 2008 049 034 is adapted to the needs in the time of the first heating with a high water evaporation. Accordingly, the amount of air compared to the heat and energy needs for post-drying is too large.

Disadvantage is the low heat dissipation (g _air × Δi) and too high residual heat of the air (g _air × i).

Disadvantage is the high energy consumption and low utilization of energy in the time of post-drying. Another disadvantage is the process control that the supplied energy is reduced, but the flow conditions in the dryer according to the heat and mass transfer are not adjusted. Another disadvantage is that the convective losses of energy increase when the air is proportionately increased towards the end of a drying cycle with less water evaporation.

Disadvantage is that the need for air on the heat absorption of the dry material and the heat and mass transfer is aligned at the beginning of drying.

From the operation of commercial cycle dryer the feature of a recirculation mode has become known. These characteristics of the dryers can also be recognized by their identification on the rating plate. In this recirculation mode exhaust air is mixed under the supply air and fed back to the dry material. With regard to the heat and mass transfer as well as the heat and mass transfer operations, this operation has the disadvantage that, as Bernoulli's air volume increases, more energy is supplied and thus the heat removal or enthalpy change Δi (kcal / kg _L ) based on the air used (L) goes back. Another disadvantage is that these flow conditions have a negative effect on the drying times.

Another disadvantage is the large amount of air (kg _L ), which is blown through the post-drying with high heat contents (i); further disadvantage: high energy losses Q _w = kg _air × (i). The disadvantage is that because of insufficient cooling of the air and heat dissipation from the air too much energy remains at high temperature in the air.

Another disadvantage is the process itself, that an exhaust air, which comes from a colder precursor in the heat exchange is used for "heat and mass transfer operations" at a higher temperature level; A significant disadvantage is that the residence time t of the heated air and the heat dissipation Δi per kg of air are lower and the lack of alignment of the flow conditions with the requirements of heat transfer.

The disadvantage of the prior art convective dryers is that with respect to the air, the flow properties of the gases with the thermo-thermal functions for gases in the thermodynamics, namely the heat and mass transfer, for the dissipation of heat from the air and for the optimization of the Energy requirement and including the value-dependent control of the heat supply are not tuned and too much energy contained in the exhaust air.

The object of the invention is, starting from the cited prior art in convective cycle dryers, the course of drying and the heat demand for carrying out the drying of textile materials, according to the demand for energy over the duration of a drying cycle, for the treatment of certain amounts Dry goods z. B. in the form of a laundry, to propose further measures to allow a better use of the energy supplied, and a lower consumption of energy over the duration of drying. Another task is to propose by appropriate measures a lower demand for energy and thus less primary energy consumption, a reduction in the cost of energy and a reduction of CO ₂ emissions and to show possibilities for reproducible implementation of the measures on existing plants and new installations.

The object is achieved on the basis of a prior art in the ventilation design of clock dryers and a cyclic operation of the convective drying by the features in the characterizing part of claim 1 and by features of the method according to claim 9.

Advantageous developments and embodiments of the invention are possible by the measures mentioned in subclaims 2 to 8 and 10.

An essential feature of the invention is accordingly that clock dryer with a rotatable drum for dry material, in which dry matter in the form of textiles, laundry and textile materials contained and mats treated and dried by a heated, guided in an induced draft air stream and after-dried consists from the 2-side open suction over the rotatable drum, from an inlet opening, a heating stage, piping means to and from the drum with a connection to the suction of a fan, that for the after-drying a Zuluftinstallation of piping means to limit the induced draft by higher pressure - and flow losses in narrower cross sections (F × w) for an increase in the residence time t of the air flow in the drum and for an increase in heat and mass transfer - gas / solid - from the air (kcal / kg air) on the dry material is provided.

The main advantage is that the air volume of the induced draft is limited by a supply air installation and piping for the after-drying.

Namely, it is known in the post-drying in so-called rotary tubes, in which a predried dry matter as a batch convectively, with air, heated, known that the heat and mass transfer and the heat flow from the air to the dry matter are dependent on the time factor and therefore the power, expressed as specific heat transfer in kcal / kg of air in the rotary kiln, is dependent on flow conditions. For this time factor, expressed as the residence time t of the heated air at the dry material, the following applies to the rotary tube volume V: t = V / V '; (1) with V as the volume (m ³ ) of the rotary tube, here the content of the rotatable drum in m ³ and with V 'as the volume flow in m ³ per second. On the other hand, in this time t a certain heat from the air to the colder dry material can be derived. This heat transfer (air-solid) proceeds according to equation (2) and describes, among other things, a heat output per kg of air: Q _wL = α × F × θ _m ; (2) with the average temperature gradient θ _m (Thäta- _m) as the difference between the clothing and the surrounding air, which is constantly heated by an object of fresh air; with F as the effective area (m ² ) of the textile material and a specific heat transfer coefficient α. This value α can be set in a range of 20 kcal / m ² h ° C in the heating phase.

Corresponding to the time factor and a flow in the induced-draft exhaust train with variable residence time t of the air in the drying _space , the heat exchange and the heat flow Q _wL from the air are proportional to the residence time of the air at the dry material in the rotary kiln. Accordingly, a higher dwell time t is realized by a supply air installation and by ducting means having narrower cross-sections in the drum to derive a larger amount of energy from the air expressed in (kJ / kg) kcal / kg of air. Less air is needed for the heat output of the dryer.

The advantage is that the supply air installation for a small volume of air requires piping and ventilation equipment with a small diameter and little material. It is also sufficient to use a panel with 2-10% open area. Further advantageous measures are: increasing the residence time t of the air at the dry material and a better heat exchange Q _WL in the time t. Further advantages: the saving of energy and energy costs, because less hot air (g _air × i) is released even with circulating air.

Accordingly, the invention is characterized in that for the provision of heat demand under the conditions of a subsequent drying a Zuluftinstallation with pipeline means for an increase in the residence time t of the air flow in the drum and for the increase of heat and mass transfer - air / dry matter - of the Air (kcal / kg-air) is provided on the (colder) dry material in the after-drying, so that fluidic measures Zuluftseitig, are provided additively.

The advantage is that more heat (g _air × Δi) is dissipated from the air and less heat is lost with the exhaust air (g _air × i).

An advantageous embodiment of the invention is given by the fact that a throttle point is provided in the supply air installation. Advantageously, a throttle point is provided to increase the pressure losses within the induced draft. The advantage is that the volume output of the induced draft is reduced by a choke or throttle.

An advantageous embodiment of the invention is given by the fact that a volume controller FC is provided in the supply air installation. Advantageously, a control of the volume FC is provided to increase the pressure losses in the pipeline means. The advantage is that a certain volume flow can be regulated by a mechanical volume flow controller. Further advantages are the small tube cross-section and the simplicity, including in recirculation through the mech. Volume controller FC (FC means "flow control") A significant advantage is that volume-dependent and proportional to the residence time t of the volume, the amount of energy used (kcal, kJ) per kg of air for post-drying is adjustable via the volume controller FC; Another advantage that with a longer residence time in contact with the dry material, the air is cooled further.

Advantages are a high control accuracy and a simple retrofit due to the ventilation functions of the volume controller FC.

An advantageous embodiment of the invention is given in such a way that a closable flap is provided on the induced draft. This flap closes the induced draft. If the evaporation of moisture in the main drying phase comes to an end, then the flap can be closed advantageously. Subsequently, the drying takes place via the supply air installation.

The advantageous measure is that with the closing of the flap of the dryer is operated with a new drying program suitable for post-drying. The advantage is that the residence time t of the air increases and more energy (kcal, kJ) from the air is used as heat.

The main advantage is that energy and energy costs are saved when the flap is closed.

Another advantage is the retrofitting and a subsequent realization of the above advantages.

An advantage is the simple execution; The advantage is that a supply air installation can be used to supply the heat for 2 drying sections.

The advantage is that the cycle dryer is used for drying and after-drying with energy-saving flow in the induced draft; Another advantage: sustainability in the planning, production and operation of post-drying.

A further advantageous embodiment of the invention is given by the fact that the flap is provided with an open flap position for the release of the induced draft. In this embodiment, a good operation in the evaporation phase is maintained and is complemented by an energy-saving drying drying advantageous. Advantage is: the saving of costs.

The advantage is the simplicity of the energy-saving drying and the execution in an apparatus. Another advantage is that the dried material remains in the dryer until the necessary heat is transferred; Further advantages: simplified equipment in terms of handling and transport of the dry material.

An advantageous development of the invention is given in such a way that a control device is provided for setting the flap. The advantage is that the flap is closed by a control unit. Another advantage is that an adjustment to the energy demand for a time value is possible.

The advantage is that 2 different drying sections over time by a controller also be retrofitted in the cycle dryer.

An advantageous embodiment of the invention is given that a temperature value Tl is provided for feeding the control unit. Temperatures which map the course of the drying and the heat exchange from the air are advantageously used to supply the control unit.

The advantage is that the temperature Tl at the constant amount of air, a variable function parameter is displayed and measured.

The advantage is that the control unit and the flap work according to a temperature value T1.

An advantageous further development of the invention is given by the fact that a value dependent on the temperature sensor T1 is provided for the termination of the after-drying. Advantageously, the achievement of a temperature in the exhaust air is used as the setpoint for the end of the after-drying.

The main advantage lies in the process reliability that is supplied regulated by the supply air energy and the post-drying is finished at a certain temperature value. The advantage is a safe operation of the cycle dryer.

An advantageous development of the invention is given by a method for final drying, in which in a cycle dryer with a rotating drum for dry material, in which dry material in the form of textiles, laundry and textile materials and mats treated and heated by a, in one Discharge-induced air flow is dried and re-dried, consisting of the 2-sided open suction through the rotatable drum, an inlet opening, a heating stage, piping to and from the drum with a connection to the suction nozzle of a fan, characterized in that with a supply air installation Pipe means for limiting the induced draft by higher pressure / flow losses, the post-drying is operated with an increase in the residence time t of the air flow in the drum and an increase in the heat exchange - gaseous / solids - of the air (kcal / kg-air) on the dry material ,

An essential feature of the method according to the invention is that the after-drying in the dryer is operated by means of a supply air installation and a limitation of the induced draft.

• (1) Wärmebedarf am Trockengut zur Erwärmung >/= 15°C, Verdampfung von Restwasser </= 5%, sowie Verluste zur Erwärmung des Drehrohres, – konstanter, nicht regelbarer Energiebedarf der Nachtrocknung;
• (2) variable, regelbare Restwärme in der Abluft (Q_wL = kg_Luft × i) nach der Wärmeabgabe. Diese Luftmenge ist variabel. Die Restwärme ist ungenutzte Energie der Luft mit der Enthalpie (i) in kJ/kcal pro kg-Luft. Näheres auch in Mess-Stelle 32 s. Unten.

Namely, for the transmission of the drying energy intermittently in a rotary tube between the heat demand, the heat input and the heat transfer - gaseous / solid - dependencies, including the time factor, as follows:

• (1) heat requirement at the dry material for heating> / = 15 ° C, evaporation of residual water </ = 5%, as well as losses for heating the rotary kiln, - constant, non-controllable energy demand of the after-drying;
• (2) variable, controllable residual heat in the exhaust air (Q _wL = kg _air × i) after the heat release. This amount of air is variable. The residual heat is unused energy of the air with the enthalpy (i) in kJ / kcal per kg air. For details also in measuring point 32 s. Below.

The consumption of energy is the sum Pos. (1) + Pos (2). Accordingly, the amount (kg), the enthalpy (i) and the residual heat of the exhaust air and the consumption of energy from (1) + (2) decrease, with an increase in the residence time (t) and a better heat transfer coefficient α from the air.

Accordingly, the cycle dryer and the process of post-drying are characterized by the fact that the heat requirement for (re) drying is due to the limitation of the induced draft.

Conversely, it is such that dry material remains in the dryer until the heat demand has been derived from an air quantity kg at the residence time (t) of the air.

An advantageous development of the method is given by the fact that the induced draft is limited by a throttle point and / or a volume controller FC. Advantageously, the induced draft but a throttle point and / or a mechanical flow regulator is performed. The advantage is that higher flow losses are achieved in the pipeline means according to the needs in each case by a throttle point or a volume controller.

The main advantage is that energy is saved and only via the volume regulator, the air requirement is supplied; Another advantage that over a time sequence 2 process namely the evaporation and the post-drying can be carried out in a dryer and these processes are operated in the plant inventory offset in time.

The advantage is that it increases the heat exchange from the air and reduces the heat requirement for after-drying; Another advantage is that primary energy and costs for primary energy are saved.

Another advantage for climate protection is that it reduces the release of CO ₂ , the release of hot air and the consumption of fossil energy.

The advantage is a molar reduction of CO ₂ corresponding to the molar saving of CH ₄ (natural gas). Namely, it is in the use of energy so that one (1) MOL CO ₂ is formed from a 1 CH ₄ with the supply of atmospheric oxygen O ₂ .

Advantage of the above measures is that a dryer by retrofitting, at energy costs (currently) of 90 € per 100 liters of oil, economically and ecologically operated.

Further advantages will be apparent from the attached examples, which are related to 1 to 2 to be discribed.

embodiments

Embodiments are shown as a drawing and will be explained in more detail with reference to the figures. In detail show:

1 a supply air installation on a cycle dryer;

2 Clock dryer with convective drying.

In 1 is for convective drying in perspective view a clock-dryer with a supply air installation connected to a suction drawn, which in the present case from the housing 1 of the dryer 2 , a supply air installation 3 , Pipeline means inform a pipeline 4 and a volume controller (FC) 5 , connected to the induced draft, from a heating stage 6 , via a rotatable drum 7 , a fan 8th and a connecting pipeline 9 to the intake of the fan 8th exists, as well as a flap 10 in the pipeline 11 which is closed during the phase of post-drying. In addition to the connection of the supply air installation 3 to the heating level 6 that here with the pipeline 4 and a volume controller FC 5 on an indirect heating stage 6 is led to the heating of the air and in addition to the limitation of the induced draft volume V 'by higher pressure and flow losses in the pipeline 4 , other arrangements are possible. Important for the connection of the supply air installation is that a limitation of the induced draft on the volume V 'in the after-drying, starting from a narrower cross-section of the pipeline 4 and, if necessary, the volume controller FC 5 optionally a throttle point is reached. Next is at the heating stage 6 a pipeline 11 Tied with a closable flap, which is closed during the time of drying.

In the present case, the heating stage is used as a heating coil for indirect heat supply via liquid, vaporous heat transfer medium or electr. Stream formed, which is often open with an inlet opening formed. There are also other heat levels common in which air is heated directly in a burner for gaseous or liquid fossil fuels. Important in the execution of the heating stage is that reducing the air consumption during the drying process, the absorbed energy in the heating stage at the same temperature is reduced, and thereby the benefits of savings in the after-drying can be achieved.

The air in the induced draft of the dryer 2 So is about piping inform the pipeline 4 , the heating level 6 , heated in the case 1 with the rotary tube volume V , over the pipeline 9 , the fan 8th as volume V 'out and on the residence time t by means of the pipeline 4 and the volume controller (FC) 5 set for the post-drying. The drying process is finished when a certain temperature in the dryer on the air side is reached.

Further advantages of the invention are in conjunction with the illustration of 2 and will be described below.

In 2 For convective drying, a dryer is shown in a sectional view with a supply air installation for after-drying as a scheme, in the present case, from the housing 15 of the dryer 12 , a drum 13 , shown as a rotary tube, a burner 14 for gas, inlet openings 16 as original delivery limit 17 ex works, from a pipeline 18 with a lockable flap 19 for cooling air, a supply air installation for after-drying with a pipeline 20 for drying air, a volume regulator (FC) 21 and a throttle point 22 for air in the time of post-drying, a continuing pipeline 23 for drying air and a closable flap 24 and continue a pipeline 25 for exhaust air, connected, on the suction side to a fan 26 and from a temperature sensor Tl 27 with a connection to one control cabinet 28 consists. About this control cabinet 28 become the flaps 19 and 24 via signals 29 . 31 closed and opened at the time of cooling. It is important in all embodiments that during the drying time an increase in the residence time t of the air and increase in the heat and mass transfer - gaseous / solid - from the air to the dry matter in pipeline means, even in the case of a return line 30 for exhaust air, and by a setpoint at the volume controller (FC) 21 possible is that the volume V of the rotary tube / drum 13 is used to increase the contact times t in the after-drying, in order to achieve the advantages of the invention namely an increase in the heat and mass transfer and increase in heat transfer coefficients α from the air. Through the position of the flaps, the induced draft for air is released when the flap is opened for the time period of main drying.

Next is a measuring point 32 in the pipeline 25 shown on-site, in which a sampling with adiabatic saturation and the determination of the heat content i of the air (kcal / kg _L ) as actual values over the duration of the clock drying are possible. The advantage is the reproducibility of the sampling before and with the increase in the residence time t; Another advantage is a determination of the volume (F × w) Bernoulli in m ³ / sec with a pitot tube complementary to the volume in the controller 21 ,

The advantage is a double protection of the volumetric data, the dwell time t and in the case of recirculation through the pipeline 30 ,

The advantage is that the demand for energy is limited by the supply air installation over the duration of the drying over the actual values and in the burner only the necessary primary energy from natural gas is given up.

Further advantages are the saving of excess energy from the exhaust air and savings in that the exhaust air side and starting from the central axis of the rotary tube is heated only with residual heat of the air and the advantage of an economic and ecological improvement in cycle dryers in laundries.

Further advantages result from the application of the first law of thermodynamics and from the numerical example of the heat and mass transfer as well as the balancing of the heat and mass transfer operation. The first law of thermodynamics according to E. Schmidt / Technical Thermodynamics: "Heat is an energy form, it can be generated from mechanical work and converted into it."

Furthermore, the principle of conservation of energy and from the experience of the first law is also true for laundry machines, according to E. Schmidt: "There is no machine that permanently destroys energy, without an equivalent amount of other energy." example Clock dryer with mats Stroke dryer 220 kg gas heated, with circulating air Drum / rotary tube Diameter 1710 mm / length 2390 mm Volume V 5.49 m ³ Nominal air 8 000 m ³ / h - for drying phase Residence time after (1) t = 5.49 / 8000 × 3 600 2.47 seconds A) actual state Measurements M-point 32 from August 1, 2011 without FC Volume at 84 ° C 209 m ³ / minute (place 32) Residence time according to equation (1) 1.57 seconds Specific volume at 84 ° C 1.09 m ³ / kg air B) with V-controller FC 21 Setpoint volume 20 m ³ / minute (location 32) Residence time according to equation (1) t = 5.49 / 20x60 16.47 seconds

The longer residence time increases the heat removal per Nm ³ air over the time of 16.47 seconds, from equation (2) follows the heat removal from air: Q _wL = α × F × θ _m ; (2) The heat transfer coefficient α is improved specifically for each Nm ³ air with α = 20 × 1000 cal / hm ² ° C with the residence time (t) as parameter: A) Actual state without FC at t = 1.57 seconds: α = 20 × 1000 × 1.57 / 3600 8.72 cal / Nm ³ m ² ° C B) With V-controller FC over at 16.47 seconds α = 20 × 1000 × 16.47 / 3600 91.5 cal / Nm ³ m ² ° C

The main advantage for the cycle dryer is that based on the specific heat transfer coefficient α of 20 kcal / m ² h ° C, this value based on the use of heat from air by 1050%, ie a factor of 10.5 (91.5 / 8 , 72) is improved; C) Savings & earnings Average exhaust air 84 ° C, v = 1.09 m ³ / kg, i = 84 kJ / kg air; Reduction of the volume, according to the invention by supply air installation: (209-20) 189 m ³ / min. or 173 kg / minute Saving and conservation of energy: 173 kg × 84 (i) = 14,565 kJ / minute 3 484 kcal / min. or 4.05 kWh therm. Per minute Saving on gas 0.4 Nm ³ per minute Savings on CO ₂ 0.4 Nm ³ or 0.79 kg CO ₂ / minute

D) Further advantage and plausibility

• (1) werden obige Einsparungen durch den besseren Wärme- und Stoffaustausch realisiert, Einspar-Leistung 60 × 4,05 = 243 kW
• (2) der variable Energieverbrauch geht zurück – minus 243 kW und
• (3) die Nutzwärme (Nutzwärme ist abgeleitete Wärme aus Luft.) hat einen Wert von > 200% des eigentlichen Bedarfes, bemessen an 2,5°C pro Minute Erwärmung.

At a heating rate of 2.5 ° C per minute - as a target value - in the final drying of mats, c _p = 0.35 kcal / kg,

• (1) the above savings are realized through better heat and mass transfer, saving power 60 × 4.05 = 243 kW
• (2) the variable energy consumption goes down - minus 243 kW and
• (3) the useful heat (useful heat is derived heat from air.) Has a value of> 200% of the actual requirement, measured at 2.5 ° C per minute heating.

• – CO₂ Gutschriften auf Personen; Fossile Energie auf Fahrzeuge.

The advantage is the allocation of savings to people and consumers,

• - CO ₂ credits to persons; Fossil energy on vehicles.

The economic and ecological value of the invention results from the achieved consumption of fossil energy: - Energy consumption with volume control (B) at 20 m ³ / minute (18.34 kg x 180 i) at 180 ° C 3,363 kJ / minute - saving energy 14,565 kJ / minute - Amount of savings (3363 of 17928) 81% - A material cost, once of 50 kg, for piping means is necessary for the saving of 81%.

LIST OF REFERENCE NUMBERS

1

casing

2

dryer

3

Zuluftinstallation

4

pipeline

5

Volume controller (FC), volumetric flow controller

6

heating stage

7

Drum, rotatable

8th

fan

9

pipeline

10

flap

11

pipeline

12

dryer

13

Drum, rotatable

14

Heating level for gas

15

casing

16

inlet port

17

delivery limit

18

pipeline

19

Flap, lockable

20

pipeline

21

Volume controller FC

22

restriction

23

pipeline

24

Flap, lockable

25

pipeline

26

fan

27

Temperature sensor T1

28

control cabinet

29

control signal

30

Pipeline, recycling

31

control signal

32

Measuring spot

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10302973 [0005]
• DE 102008049034 [0010, 0013]

Claims (10)

Clock dryer with a rotatable drum ( 13 ) for dry material in which dry matter in the form of textiles, linen and textile coated mats and textile-containing materials treated and dried by a heated, guided in a draft airflow and dried, consisting of the, open to 2 sides, induced draft on the rotatable Drum ( 7 . 13 ) (Rotary tube), from an inlet opening ( 16 ), via a heating stage ( 6 . 14 ), Piping means to and from the drum with a connection to the suction nozzle of a fan ( 8th . 26 ), characterized in that for the after-drying a Zuluftinstallation of pipeline means ( 4 ; 4 . 5 ; 20 . 21 . 22 ;) for limiting the induced draft by higher pressure and flow losses in narrower cross sections (F × w) for an increase in the residence time t of the air flow in the drum ( 7 . 13 ) and for an increase in the heat and mass transfer - gas / solids - is provided by the air (kcal / kg air) on the dry matter. Cycle dryer according to the preceding claim, characterized in that a throttle point ( 20 ) is provided in the supply air installation. Clock-type dryer according to the preceding claim, characterized in that a volume controller FC ( 5 . 21 ) is provided in the supply air installation. Cycle dryer according to the preceding claim, characterized in that a closable flap ( 10 . 24 ) is provided on the induced draft. Cycle dryer according to one of the preceding claims, characterized in that for the release of the suction train the flap ( 7 . 24 ) is provided with the flap open. Clock dryer according to one of the preceding claims, characterized in that a control unit ( 28 ) to place the flap ( 7 . 24 ) is provided. Cycle dryer according to one of the preceding claims, characterized in that a temperature sensor Tl ( 27 ) for supplying the control unit ( 28 ) is provided. Cycle dryer according to one of the preceding claims, characterized in that one of the temperature sensor Tl ( 27 ) dependent setpoint for the termination of the after-drying is provided. Method for post-drying in a cycle dryer ( 2 . 12 ), according to claim 1, with a rotatable drum ( 7 . 13 ) for textile dry goods, in which dry matter in the form of textiles, laundry and textile materials and mats treated and dried by a heated, guided in an induced draft airflow and after-dried, consisting of the 2 sides open suction through the rotatable drum ( 7 . 13 ), from an inlet opening ( 16 ), via a heating stage ( 6 . 14 ), Piping means to and from the drum with a connection to the suction nozzle of a fan ( 8th . 26 ), characterized in that with a Zuluftinstallation from pipeline means ( 4 ; 4 . 5 ; 20 . 21 . 22 ;) to limit the induced draft by higher pressure / flow losses, the post-drying with an increase in the residence time t of the air flow in the drum ( 7 . 13 ) and an increase in the heat exchange - gaseous / solid - is operated by the air (kcal / kg air) on the dry material. Method according to the preceding claim, characterized in that the induced draft through a throttle point ( 22 ) and / or a volume controller FC ( 6 . 21 ) is limited.

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