CA1087085A - Concentration and hot-air drying plant - Google Patents
Concentration and hot-air drying plantInfo
- Publication number
- CA1087085A CA1087085A CA301,053A CA301053A CA1087085A CA 1087085 A CA1087085 A CA 1087085A CA 301053 A CA301053 A CA 301053A CA 1087085 A CA1087085 A CA 1087085A
- Authority
- CA
- Canada
- Prior art keywords
- air
- path
- heat exchanger
- steam
- heating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/001—Heating arrangements using waste heat
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/16—Evaporating by spraying
- B01D1/18—Evaporating by spraying to obtain dry solids
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Drying Of Solid Materials (AREA)
- Sampling And Sample Adjustment (AREA)
- Freezing, Cooling And Drying Of Foods (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Concentration and hot-air drying plant comprising a con-centration unit including a heating steam path having its outlet optionally connected to a condenser a hot-air drying unit supplied with hot air from a feed path comprising means for drawing air from the external atmosphere and means for heating the air thus drawn and heating the same to a predetermined temperature, a heat exchanger having an air path disposed in series in the air feed path of the drying unit, upstream of the heating means, and a steam path supplied with steam from the heating steam path of the concentration unit.
Concentration and hot-air drying plant comprising a con-centration unit including a heating steam path having its outlet optionally connected to a condenser a hot-air drying unit supplied with hot air from a feed path comprising means for drawing air from the external atmosphere and means for heating the air thus drawn and heating the same to a predetermined temperature, a heat exchanger having an air path disposed in series in the air feed path of the drying unit, upstream of the heating means, and a steam path supplied with steam from the heating steam path of the concentration unit.
Description
The present invention relates to a concentration and hot-air drying plant of the type comprising a concentration unit equipped with a heating steam path having its outlet optionally connected to a condenser, and a hot-air drying unit supplied with hot air through a feed path comprising means for drawing alr from , the external atmosphere and means for heating this air to a pre-determined temperature.
In the food, chemical and pharmaceutical industries, plants of the above-defined type are known, notably for manufactur-ing pulverulent products such as powdered milk, whereln the con-I centration unit and the hot-air drying unit are sometimes disposed side by side but independent o~ each other from the point of view of energy. As a rule, the liquid treated by the concentration unit is subsequently treated by the hot-air drylng unit, optionally after one or a plurality of other intermediate treatments, that is, between the concentration phase and the drying phase. ~lowever, the concentration unit and the hot-air drying unit may also be used for processing different products.
In general, the hot air stream utilized for drying the treated product is obtained by taking air from the external atmos-~ phere, then heating this air to a well-defined temperature depend-¦ ing on the drying method and the specific nature of the product to be treated, by using any suitable heating device. In this case, the consumption of heat energy necessary for heating the air depends on the temperature of the external atmospheric air. This temperature varies considerably according to the season and to the time o~ day. In addition to the fact that the consumption of heat energy of the heating device may be relatively high during cold seasons and periods, it is also necessary to incorporate in the heating device a regulation system capable of causing the heating power to vary as a function of the temperature of the incoming air drawn from the external atmosphere if it is desired .
, to maintain under all circumstances the hot-air stream delivered to the drying unit at a well-defined temperature.
¦ In view of the foregoing, the present invention provides a plant of the type broadly set forth hereinabove, wherein the drying unit is suppiied with hot air at a predetermined temperature j irrespective of the season or period while requiring a heat energy ; consumption lower than the average consumption usually recorded in conventional plants of this character.
The present invention also provides a plant of the type set forth hereinabove wherein the heat energy consumption of the ¦ heating device may be kept at a constant value irrespective of ~ seasons and periods.
¦ According to the present invention there is provided a concentration and hot-air drying plant comprising concentration unit including a heating steam and a hot-air drying unit to which hot air is supplied via a feed path comprising means or drawing air from the atmosphere and means for heating the air thus drawn from the atmosphere to a predetermined temperature, a heat ¦ exchanger having an air path disposed in series in the feed path supplying air to the drying unit upstream of the heating means and a steam path supplied with steam from the heating steam path of the concentration unit.
Thus in accordance with the present invention the plant includes a heat exchanger having an air path disposed in series witl the path supplying air to the drying unit, upstream of the heating device, and a steam path supplied with steam from the heating steam path of the concentration unit.
According to a specific embodiment of the present inven-tion, the heat exchanger steam path may be connected to the outlet of the heating steam path of the concentration unit. With this arrangement it is thus possible to advantageously recover at least a fraction of the heat contained in the steam (at about 45C)
In the food, chemical and pharmaceutical industries, plants of the above-defined type are known, notably for manufactur-ing pulverulent products such as powdered milk, whereln the con-I centration unit and the hot-air drying unit are sometimes disposed side by side but independent o~ each other from the point of view of energy. As a rule, the liquid treated by the concentration unit is subsequently treated by the hot-air drylng unit, optionally after one or a plurality of other intermediate treatments, that is, between the concentration phase and the drying phase. ~lowever, the concentration unit and the hot-air drying unit may also be used for processing different products.
In general, the hot air stream utilized for drying the treated product is obtained by taking air from the external atmos-~ phere, then heating this air to a well-defined temperature depend-¦ ing on the drying method and the specific nature of the product to be treated, by using any suitable heating device. In this case, the consumption of heat energy necessary for heating the air depends on the temperature of the external atmospheric air. This temperature varies considerably according to the season and to the time o~ day. In addition to the fact that the consumption of heat energy of the heating device may be relatively high during cold seasons and periods, it is also necessary to incorporate in the heating device a regulation system capable of causing the heating power to vary as a function of the temperature of the incoming air drawn from the external atmosphere if it is desired .
, to maintain under all circumstances the hot-air stream delivered to the drying unit at a well-defined temperature.
¦ In view of the foregoing, the present invention provides a plant of the type broadly set forth hereinabove, wherein the drying unit is suppiied with hot air at a predetermined temperature j irrespective of the season or period while requiring a heat energy ; consumption lower than the average consumption usually recorded in conventional plants of this character.
The present invention also provides a plant of the type set forth hereinabove wherein the heat energy consumption of the ¦ heating device may be kept at a constant value irrespective of ~ seasons and periods.
¦ According to the present invention there is provided a concentration and hot-air drying plant comprising concentration unit including a heating steam and a hot-air drying unit to which hot air is supplied via a feed path comprising means or drawing air from the atmosphere and means for heating the air thus drawn from the atmosphere to a predetermined temperature, a heat ¦ exchanger having an air path disposed in series in the feed path supplying air to the drying unit upstream of the heating means and a steam path supplied with steam from the heating steam path of the concentration unit.
Thus in accordance with the present invention the plant includes a heat exchanger having an air path disposed in series witl the path supplying air to the drying unit, upstream of the heating device, and a steam path supplied with steam from the heating steam path of the concentration unit.
According to a specific embodiment of the present inven-tion, the heat exchanger steam path may be connected to the outlet of the heating steam path of the concentration unit. With this arrangement it is thus possible to advantageously recover at least a fraction of the heat contained in the steam (at about 45C)
- 2 -~L08~ 5 ~ .
issuing ~rom the concentration unit, which heat was heretofore ; generally consumed and simply lost in the condenser, for pre-heating the air taken from the external atmosphere to the predet-ermined temperature by means of the heating device of the drying unit hot air feed path. Consequently, the quantity of heat to be deliv~red by the heating device for heating the external air to the predetermined temperature is lower than the quantity of heat required in conventional plants of this type, thus saving a ~ considerable amount of heating energy.
;~ 10 Moreover, since the air flow is constant and the steam delivered to the heat exchanger has a constant temperature, the heat exchange surface area between the air path and steam path of -~ the heat exchanger may be calculated so that the temperature of ;~ the pre-heated air delivered by the heat exchanger remains sub-stantially constant when the temperature of the air taken from the j external atmosphere varies with seasons or the day's period.
Under these conditions, since the heating device is supplied with pre-heated air at a substantially constant temperature, the j temperature regulation means hitherto required in known plants of this character can safely be dispensed with.
In addition, it will be seen that since at least one ~ fraction of the steam delivered from the concentration unit is ; condensed in the heat exchanger, the quantity of steam possibly condensed in the condenser is reduced considerably. Thus, the advantageous features of the invention which have been mentioned ; hereinabove are completed, by the fact that with the plant accord-ing to this invention the consumption of cold water in the condense~
:, may also be reduced. Another advantage is obtained from the ecological point of view when the water necessary for cooling the condenser is pumped from a river and subsequently rejected into the same river, since both the amount of heat transferred to or dis-sipated in the cooling water and the amount of heated cooling water _ 3 _ , . ~ , : , .;
1~37~5 ., rejected to the river are lower than those observed in hitherto known plants.
The present invention will now be described with referencc~
,~ to the accompan~ing drawing of which the single Figure illustrates diagrammatically a concentration and drying plant constructed ' according to one embodiment of the present invention.
¦ The plant illustrated in the drawing comprises a concen-tration unit 1 and a hot-air drying unit 2 to which hot air is ,~ supplied via a feed path 3.
7 lo The concentration unit 1 may comprise one or several stages, for instance two stages mounted in series as illustrated in the Figure, in which 4_ and 4b designate the evaporation columns for example of the downward-flowing film type, 5_ and 5b designate cyclones for separating the droplets of the liquid to be concen-trated from the steam issuing from the evaporation columns 4 and . 4b.
The steam from the last cyclone 5b is directed via a conduit 6 to a water-cooled condenser 7. This condenser 7 may be of the mixer or surface type. Concentration units of the above-described type are well known in the art and therefore a detailed ¦ description thereof is not deemed necessary herein.
,~
The drying unit 2 is intended more particularly for obtaining pulverulent products by atomizing a liquid in a hot air stream. In this case, the drying unit 2 may comprise simply a cylindro-conic~l atomizing vessel 8 associated with a separator cyclone 9 and an air extraction fan 10. An atomizer 11 mounted through the top wall of vessel 8 is adapted to pulverize a con-centrated liquid in the hot-air stream supplied via feed path 3.
This feed path 3 comprises on the one hand a motor-driven blower 12 capable of drawing a constant flow of atmospheric air through ~¦ an air inlet 13 provided with suitable filter means, and on the other hand heating means 14 for heating the thus sucked air to a ~' .
~ 4 ~
' ':
7~E~S
predetermined temperature. The atomizer and hot-air drying units of the above-described type are well known and -therefore a detailed description thereof is also not deemed necessary herein.
According to this invention, the plant includes a heat ~ exchanger 15, for example of finned battery type having its air ; path disposed within the feed path 3 upstream of the heating device 14, for example between the air inlet 13, and the motor-driven blower 12 as shown in the drawing. This heat exchanger 15 may also if desired be disposed between the motor-driven blower 12 and the heating device 14. One fraction of the steam coming from the last cyclone 5b of the concentration unit 1 is diverted to the steam j path 15a of the heat exchanger 15 via a conduit 16 connected to t conduit 6 upstream of condenser 7. Thus, one fraction of the steam previously condensed in condenser 7 is now condensed in the heat exchanger 15 and its latent condensation heat is transferred to the incominy air for pre-heating the same.
, Preferably, the heat exchange surface area of the heat exchanger 15 is calculated so large, with due consideration for the constant air flow and also for the constant temperature of any steam supplied via conduit 16, so that the temperature of the air ;~ issuing from the heat exchanger 15 remains substantially constant when the temperature of the atmospheric air supplied thereto varies according to seasons and to the day's period.
Assuming for instance a plant of this character intended for the milk industry, for example in the manufacture of powdered milk. In this case, the steam temperature at the outlet of the
issuing ~rom the concentration unit, which heat was heretofore ; generally consumed and simply lost in the condenser, for pre-heating the air taken from the external atmosphere to the predet-ermined temperature by means of the heating device of the drying unit hot air feed path. Consequently, the quantity of heat to be deliv~red by the heating device for heating the external air to the predetermined temperature is lower than the quantity of heat required in conventional plants of this type, thus saving a ~ considerable amount of heating energy.
;~ 10 Moreover, since the air flow is constant and the steam delivered to the heat exchanger has a constant temperature, the heat exchange surface area between the air path and steam path of -~ the heat exchanger may be calculated so that the temperature of ;~ the pre-heated air delivered by the heat exchanger remains sub-stantially constant when the temperature of the air taken from the j external atmosphere varies with seasons or the day's period.
Under these conditions, since the heating device is supplied with pre-heated air at a substantially constant temperature, the j temperature regulation means hitherto required in known plants of this character can safely be dispensed with.
In addition, it will be seen that since at least one ~ fraction of the steam delivered from the concentration unit is ; condensed in the heat exchanger, the quantity of steam possibly condensed in the condenser is reduced considerably. Thus, the advantageous features of the invention which have been mentioned ; hereinabove are completed, by the fact that with the plant accord-ing to this invention the consumption of cold water in the condense~
:, may also be reduced. Another advantage is obtained from the ecological point of view when the water necessary for cooling the condenser is pumped from a river and subsequently rejected into the same river, since both the amount of heat transferred to or dis-sipated in the cooling water and the amount of heated cooling water _ 3 _ , . ~ , : , .;
1~37~5 ., rejected to the river are lower than those observed in hitherto known plants.
The present invention will now be described with referencc~
,~ to the accompan~ing drawing of which the single Figure illustrates diagrammatically a concentration and drying plant constructed ' according to one embodiment of the present invention.
¦ The plant illustrated in the drawing comprises a concen-tration unit 1 and a hot-air drying unit 2 to which hot air is ,~ supplied via a feed path 3.
7 lo The concentration unit 1 may comprise one or several stages, for instance two stages mounted in series as illustrated in the Figure, in which 4_ and 4b designate the evaporation columns for example of the downward-flowing film type, 5_ and 5b designate cyclones for separating the droplets of the liquid to be concen-trated from the steam issuing from the evaporation columns 4 and . 4b.
The steam from the last cyclone 5b is directed via a conduit 6 to a water-cooled condenser 7. This condenser 7 may be of the mixer or surface type. Concentration units of the above-described type are well known in the art and therefore a detailed ¦ description thereof is not deemed necessary herein.
,~
The drying unit 2 is intended more particularly for obtaining pulverulent products by atomizing a liquid in a hot air stream. In this case, the drying unit 2 may comprise simply a cylindro-conic~l atomizing vessel 8 associated with a separator cyclone 9 and an air extraction fan 10. An atomizer 11 mounted through the top wall of vessel 8 is adapted to pulverize a con-centrated liquid in the hot-air stream supplied via feed path 3.
This feed path 3 comprises on the one hand a motor-driven blower 12 capable of drawing a constant flow of atmospheric air through ~¦ an air inlet 13 provided with suitable filter means, and on the other hand heating means 14 for heating the thus sucked air to a ~' .
~ 4 ~
' ':
7~E~S
predetermined temperature. The atomizer and hot-air drying units of the above-described type are well known and -therefore a detailed description thereof is also not deemed necessary herein.
According to this invention, the plant includes a heat ~ exchanger 15, for example of finned battery type having its air ; path disposed within the feed path 3 upstream of the heating device 14, for example between the air inlet 13, and the motor-driven blower 12 as shown in the drawing. This heat exchanger 15 may also if desired be disposed between the motor-driven blower 12 and the heating device 14. One fraction of the steam coming from the last cyclone 5b of the concentration unit 1 is diverted to the steam j path 15a of the heat exchanger 15 via a conduit 16 connected to t conduit 6 upstream of condenser 7. Thus, one fraction of the steam previously condensed in condenser 7 is now condensed in the heat exchanger 15 and its latent condensation heat is transferred to the incominy air for pre-heating the same.
, Preferably, the heat exchange surface area of the heat exchanger 15 is calculated so large, with due consideration for the constant air flow and also for the constant temperature of any steam supplied via conduit 16, so that the temperature of the air ;~ issuing from the heat exchanger 15 remains substantially constant when the temperature of the atmospheric air supplied thereto varies according to seasons and to the day's period.
Assuming for instance a plant of this character intended for the milk industry, for example in the manufacture of powdered milk. In this case, the steam temperature at the outlet of the
3 last cyclone 5b of the concentration unit 1 ~ill be about 45C.
Under these conditions, the air can be heated in the heat exchanger 15 to a constant temperature of about 35C. Thus, a constant steam equivalent consumption of less than 1.6 kg of s-team per kg of evaporated water, instead of 1.8 kg in conventional plants, can be warranted, that is, a heat energy consumption about 10 to 12 %
lower than the average consumption usually registered in conven-, tional plants.
j Instead of deriving one fraction of the steam issuing from the last cyclone 5b of the concentration unit 1, steam may be taken from an in~ermediate pOillt of the steam path of this concentration unit 1, for example from the top of the last evapor-ation tower 4b, by means of a branch conduit 16' shown in phantom lines in the drawing. The choice of the point from which steam is ~, diverted for supplying the heat exchanger 15 should constitute a ~.; .
compromise between on the one hand the desired air temperature at the outlet of the heat exchanger, which, of course, should be as , high as possible, and on the other hand the cost o~ the steam thus drawn and the influence thereof on the efficiency of the concen-tration unit.
It is also possible to supply steam to the heat exchanger 15 both through conduits 6 and 16 and through conduit 16'. In -this case, the exchanger 15 may comprise either two separate heat ~ exchangers having their air paths connected in series, or a single ., J heat exchanger provided with two separate steam paths spaced along ' 20 its air path. Since the temperature of the steam delivered via ¦ conduit 16' is higher than the temperature of the steam fed via :
conduit 16, the steam path 15a of the heat exchanger 15, which is the first stea~ path occurring along the air path, is connected to the conduit 16, and the steam path 15b of the heat exchanger 15 which is second in said air path is connected to conduit 16'.
On the other hand, instead of branching the steam path 15a of the heat exchanger 15 off the condenser 7 as described here-inabvoe, the steam path 15a of the heat exchanger 15 may be connect ed in series between the outlet of the last cyclone 5b of the concentration unit 1 and the condenser, the latter then being positioned as shown in phantom lines at 7' in the Figure. Under these conditions, all the steam emerging from the last cyclone 5b ,: ., , . . , .: , ,: . .:
s ~L0~370~5 is directed to the heat exchan~er 15 where the whole or part of this steam is condensed, any residual uncondensed steam fraction I being directed via another conduit 17 to the condenser 7' and ~i condensed therein~
¦ As a rule, the air flow obtained through the feed path 3 ¦ and consequently in the air path of the heat exchanger 15 is not J sufficient for condensing all the steam fed from the last cyclone 5b, so that in most cases condenser 7 or 7' will have to be maintained, but these may have smaller dimensions in comparison with the size of condensers used in conventional plants, for condensing any steam not condensed in the heat exchanger 15.
However, the same feed path 3 may be used but for treating a larger ~
air flow in order to supply hot air to several drying units or to ~-. one single drying unit and to one duct means for hot-air heating of .;~
1 the buildings in which the plant is erected. In this case, the air -I flow may be sufficient for condensing all the steam emerging from ~ the last cyclone 5_, and the condenser 7 or 7' may be dispensed 9 with completely.
Although reference has been made to a drying unit adapted to atomize a liquid in a hot-air stream, other types of hot-air drying units not necessarily operating according to the method consisting in atomizing the product to be dried. Likewise, although reference is made to a concentration unit comprising an evaporation tower of the downward-flowing film type, the present ; invention is applicable to plants comprising other types of concentrators, provided that the concentrators comprise a heating steam path.
.
.
Under these conditions, the air can be heated in the heat exchanger 15 to a constant temperature of about 35C. Thus, a constant steam equivalent consumption of less than 1.6 kg of s-team per kg of evaporated water, instead of 1.8 kg in conventional plants, can be warranted, that is, a heat energy consumption about 10 to 12 %
lower than the average consumption usually registered in conven-, tional plants.
j Instead of deriving one fraction of the steam issuing from the last cyclone 5b of the concentration unit 1, steam may be taken from an in~ermediate pOillt of the steam path of this concentration unit 1, for example from the top of the last evapor-ation tower 4b, by means of a branch conduit 16' shown in phantom lines in the drawing. The choice of the point from which steam is ~, diverted for supplying the heat exchanger 15 should constitute a ~.; .
compromise between on the one hand the desired air temperature at the outlet of the heat exchanger, which, of course, should be as , high as possible, and on the other hand the cost o~ the steam thus drawn and the influence thereof on the efficiency of the concen-tration unit.
It is also possible to supply steam to the heat exchanger 15 both through conduits 6 and 16 and through conduit 16'. In -this case, the exchanger 15 may comprise either two separate heat ~ exchangers having their air paths connected in series, or a single ., J heat exchanger provided with two separate steam paths spaced along ' 20 its air path. Since the temperature of the steam delivered via ¦ conduit 16' is higher than the temperature of the steam fed via :
conduit 16, the steam path 15a of the heat exchanger 15, which is the first stea~ path occurring along the air path, is connected to the conduit 16, and the steam path 15b of the heat exchanger 15 which is second in said air path is connected to conduit 16'.
On the other hand, instead of branching the steam path 15a of the heat exchanger 15 off the condenser 7 as described here-inabvoe, the steam path 15a of the heat exchanger 15 may be connect ed in series between the outlet of the last cyclone 5b of the concentration unit 1 and the condenser, the latter then being positioned as shown in phantom lines at 7' in the Figure. Under these conditions, all the steam emerging from the last cyclone 5b ,: ., , . . , .: , ,: . .:
s ~L0~370~5 is directed to the heat exchan~er 15 where the whole or part of this steam is condensed, any residual uncondensed steam fraction I being directed via another conduit 17 to the condenser 7' and ~i condensed therein~
¦ As a rule, the air flow obtained through the feed path 3 ¦ and consequently in the air path of the heat exchanger 15 is not J sufficient for condensing all the steam fed from the last cyclone 5b, so that in most cases condenser 7 or 7' will have to be maintained, but these may have smaller dimensions in comparison with the size of condensers used in conventional plants, for condensing any steam not condensed in the heat exchanger 15.
However, the same feed path 3 may be used but for treating a larger ~
air flow in order to supply hot air to several drying units or to ~-. one single drying unit and to one duct means for hot-air heating of .;~
1 the buildings in which the plant is erected. In this case, the air -I flow may be sufficient for condensing all the steam emerging from ~ the last cyclone 5_, and the condenser 7 or 7' may be dispensed 9 with completely.
Although reference has been made to a drying unit adapted to atomize a liquid in a hot-air stream, other types of hot-air drying units not necessarily operating according to the method consisting in atomizing the product to be dried. Likewise, although reference is made to a concentration unit comprising an evaporation tower of the downward-flowing film type, the present ; invention is applicable to plants comprising other types of concentrators, provided that the concentrators comprise a heating steam path.
.
.
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Concentration and hot-air drying plant comprising concentration unit including a heating steam path and a hot-air drying unit to which hot air is supplied via a feed path comprising means for drawing air from the atmosphere and means for heating the air thus drawn from the atmosphere to a predetermined temper-ature, a heat exchanger having an air path disposed in series in the feed path supplying air to the drying unit upstream of the heating means, and a steam path supplied with steam from the heat-ing steam path of the concentration unit.
2. A plant as claimed in claim 1 in which the outlet of the heating steam path is connected to a condenser.
3. A plant according to claim 2, in which the steam path of the heat exchanger is connected to the outlet of the heating steam path of the concentration unit.
4. A plant according to claim 3, in which the steam path of the heat exchanger is branched off the condenser.
5. A plant according to claim 3, in which the steam path of the heat exchanger is connected in series between the outlet of the heating steam path of the concentration unit and the condenser.
6. A plant according to claim 1, 2 or 3 in which the steam path of the heat exchanger is connected to an intermediate point of the heating steam path of the concentration unit.
7. A plant according to claim 1, 2 or 3 in which the heat exchanger, comprises two steam paths spaced along a single air path the steam path of the heat exchanger which is the first one along the air path being connected to the outlet of the heating steam path of the concentration unit, the steam path of the heat exchanger which is the second one along the air path being connected to the intermediate point of the heating steam path of the concentration unit.
8. A plant according to claim 1, 2 or 3 in which the heat exchanger is of the finned battery type.
9. A plant according to claim 1, 2 or 3 in which the heat exchange surface area of the heat exchanger is dimensioned so that for a given air flow and a given constant temperature of the steam fed to the steam path of the exchanger the temperature of the air leaving the heat exchanger remains substantially constant when the temperature of the air supplied to the heat exchanger varies.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7711056A FR2387427A1 (en) | 1977-04-13 | 1977-04-13 | CONCENTRATION AND HOT AIR DRYING PLANT |
| FR77/11056 | 1977-04-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1087085A true CA1087085A (en) | 1980-10-07 |
Family
ID=9189331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA301,053A Expired CA1087085A (en) | 1977-04-13 | 1978-04-13 | Concentration and hot-air drying plant |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS53134772A (en) |
| BR (1) | BR7802277A (en) |
| CA (1) | CA1087085A (en) |
| DE (1) | DE2815828A1 (en) |
| DK (1) | DK160578A (en) |
| FR (1) | FR2387427A1 (en) |
| GB (1) | GB1577707A (en) |
| NL (1) | NL7803949A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2648219C3 (en) * | 1976-10-25 | 1979-04-05 | Wiegand Karlsruhe Gmbh, 7505 Ettlingen | Process for heating a flowing medium different from a product to be evaporated and then dried, which is used, for example, as a heating, transport or treatment medium for this product |
| NL7906302A (en) * | 1979-08-20 | 1981-02-24 | Stork Friesland Bv | METHOD FOR OPERATING A TREATMENT EQUIPMENT AND AN EQUIPMENT INTENDED FOR IT. |
-
1977
- 1977-04-13 FR FR7711056A patent/FR2387427A1/en active Granted
-
1978
- 1978-04-07 GB GB13754/78A patent/GB1577707A/en not_active Expired
- 1978-04-12 BR BR7802277A patent/BR7802277A/en unknown
- 1978-04-12 DK DK160578A patent/DK160578A/en not_active IP Right Cessation
- 1978-04-12 DE DE19782815828 patent/DE2815828A1/en not_active Withdrawn
- 1978-04-13 CA CA301,053A patent/CA1087085A/en not_active Expired
- 1978-04-13 NL NL7803949A patent/NL7803949A/en not_active Application Discontinuation
- 1978-04-13 JP JP4271778A patent/JPS53134772A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS53134772A (en) | 1978-11-24 |
| BR7802277A (en) | 1978-11-28 |
| NL7803949A (en) | 1978-10-17 |
| GB1577707A (en) | 1980-10-29 |
| FR2387427A1 (en) | 1978-11-10 |
| FR2387427B1 (en) | 1980-05-09 |
| DE2815828A1 (en) | 1978-10-26 |
| DK160578A (en) | 1978-10-14 |
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