WO1994011306A1 - Method of avoiding calcareous deposits on heated, water-cooled tools, cooler for the implementation of the method and use of said cooler - Google Patents
Method of avoiding calcareous deposits on heated, water-cooled tools, cooler for the implementation of the method and use of said cooler Download PDFInfo
- Publication number
- WO1994011306A1 WO1994011306A1 PCT/DK1993/000367 DK9300367W WO9411306A1 WO 1994011306 A1 WO1994011306 A1 WO 1994011306A1 DK 9300367 W DK9300367 W DK 9300367W WO 9411306 A1 WO9411306 A1 WO 9411306A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cooling water
- cooling
- water
- unit
- temperature
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000000498 cooling water Substances 0.000 claims abstract description 47
- 238000001816 cooling Methods 0.000 claims abstract description 23
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 12
- 239000011575 calcium Substances 0.000 claims abstract description 12
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 7
- 230000008929 regeneration Effects 0.000 claims abstract description 6
- 238000011069 regeneration method Methods 0.000 claims abstract description 6
- 239000003814 drug Substances 0.000 claims abstract description 5
- 229940079593 drug Drugs 0.000 claims abstract description 5
- 238000000465 moulding Methods 0.000 claims abstract description 4
- 238000003466 welding Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 230000005855 radiation Effects 0.000 claims description 5
- 230000001954 sterilising effect Effects 0.000 abstract description 3
- 238000004659 sterilization and disinfection Methods 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract 1
- 239000008399 tap water Substances 0.000 description 8
- 235000020679 tap water Nutrition 0.000 description 8
- 208000004434 Calcinosis Diseases 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical group [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- 150000001669 calcium Chemical class 0.000 description 1
- 235000010216 calcium carbonate Nutrition 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
- C02F5/025—Hot-water softening devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/02—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating liquids, e.g. brine
Definitions
- the invention relates to a method of preventing calcareous deposits on heated, water-cooled tools, for example welding or moulding tools for use in the drug and food industry, or for example rollers or bearings for use in the graphic industry, where the cooling water is used to ensure a par ⁇ ticular temperature and an even distribution of tempera ⁇ ture, the temperature of the tool being app. 90-120°C, whereas the temperature of the cooling water in continuous operation never exceeds 30°C.
- This method is very economical, in part because tap water is becoming an expensive commodity, and in part because a better utilization of waste heat is achieved.
- the regeneration may consist in decomposition or removal of the calcium from the cooling water.
- the regeneration according to the in- vention may consist in radiation of the cooling water with ultra-violet light.
- a decisive embodiment of the method according to the inven ⁇ tion consists in that in the event of an interruption of operation - intended or unintended - cooling of the cool ⁇ ing water continues for so long that the temperature of the tools decreases to about 30°C.
- the invention also relates to a cooling unit for use in the implementation of the invention, and the cooling unit is advantageous in that the unit has means for recirculation and continuous regeneration of the cooling water, as well as means for cooling down the cooling water, in addition to which the cooling unit may have means for decomposition of calcium carbonat or radiation of the cooling water with ultraviolet light.
- Fig. 1 is a schematic illustration of a prior art cooling unit
- Fig. 2 is a schematic illustration of a recirculation unit according to the invention.
- Fig. 1 illustrates a prior art cooling unit comprising an apparatus 14, which contains welding or moulding tools for use in the drug or food industry.
- the temperature of these tools is app. 90-120°C during operation and must be cooled by means of cooling water in order to maintain this tem ⁇ perature.
- the cooling unit has an open water tank 15, which serves as a cooling water reservoir for the apparatus 14.
- a pump 6 is connected to the water tank 15 and is adapted to pump the cooling water from the water tank 15 to the apparatus 14 through an inlet 13, whereupon the cooling water is discharged to the atmosphere through an outlet 12.
- the water tank 15 therefore must be replenished con ⁇ tinuously in order to compensate for the loss of cooling water, which is in part discharged and in part evaporates during operation of the apparatus 14 and from the open water tank 15.
- the loss of cooling water is compensated for by intake of tap water through a feed pipe 2 as a float valve 1 has sunk to a predetermined lower level in the water tank 15.
- a feed pipe 2 as a float valve 1 has sunk to a predetermined lower level in the water tank 15.
- clean and fresh tap water is fed continuously into the re- circulation unit and together herewith, also calcium from the calcareous tap water.
- the calcium deposit is reduced to a mini ⁇ mum, and therefore this unit is considerably more economi ⁇ cal in operation, discharge of the tap water is avoided during recirculation and sterilization of the cooling water, and a satisfactory • level of purity and a quality, which meet the requirements stipulated by the health authorities is achieved.
- the recirculation unit according to invention also com ⁇ prises a water tank 15, which can be replenished with tap water through a feed pipe 2, which opens by means of a float valve 1, and the cooling water is pumped into the en ⁇ tire unit by means of a pump 6.
- the cooling water is led through an inlet 19, a thermostat 9 and a calcium decomposition element 7, wherein the calcium is removed from the cooling water, whereupon the cooling water is led further through the pump 6 and the inlet 13 to the apparatus 14, wherein the machine tools are cooled, the cooling water being at the same time heated to app. 20°C.
- the heated cooling water is returned through an outlet 12 and another calcium decomposition element 11 to an evaporator 16 provided in the water tank 15, the heat from the cooling water being utilized to evaporate freon in the evaporator 16.
- the freon is led through the evaporator 16 in the direction opposite the direction of flow of the cooling water, which will cause the heat from the cooling water to get into contact with as much freon as possible.
- the cooling water is led through a pipe provided with an undulating wall, or similar formed wall, in order to obtain the maximum surface possible for the heat exchange.
- the cooling water leaves the evaporator 16 at a temperature of app. 20°C through a water outlet 20, which is so formed that the water circulates around in the water tank 15 to the effect that a whirl is created. This causes the water in the water tank 15 to be moving constantly.
- an element 10 for emittance of ultraviolet radiation which serves to sterilize the water in the water tank 15, and this sterilization process is im- proved due to the constant movement of the water.
- the heated or evaporated freon is then cooled down in a per se commonly known cooling unit comprising a condensor 3, a motor-driven fan 18, a pipe line 21, a compressor 4, a re- ceiver 5 and a valve 8.
- the cooling unit may advantageously be provided with wheels, thus rendering the apparatus mobile.
Abstract
The invention relates to a method of preventing calcareous deposits on heated, water-cooled tools, for example welding or moulding tools for use in the drug or food industry, where the cooling water is used to ensure a particular temperature and an even distribution of temperature, the temperature of the tool being app. 90-120 °C, whereas the temperature of the cooling water in continuous operation never exceeds 30 °C. According to the invention the calcareous deposits are avoided by using recirculated cooling water, which is continuously regenerated and cooled. The invention also comprises a cooling unit for use in the implementation of the method, which unit has means (6, 12, 13, 19, 20) for recirculation and continuous regeneration of cooling water and has means (3, 4, 5, 8, 16, 18) for cooling of the cooling water. These means comprise calcium decomposition elements (7, 11) for separation of the calcium and elements (10) for ultraviolet irradiation of the cooling water for sterilization hereof.
Description
METHOD OF AVOIDING CALCAREOUS DEPOSITS ON HEATED, WATER-COOLED TOOLS, COOLER FOR THE IMPLEMENTATION OF THE METHOD AND USE OF SAID COOLER.
The invention relates to a method of preventing calcareous deposits on heated, water-cooled tools, for example welding or moulding tools for use in the drug and food industry, or for example rollers or bearings for use in the graphic industry, where the cooling water is used to ensure a par¬ ticular temperature and an even distribution of tempera¬ ture, the temperature of the tool being app. 90-120°C, whereas the temperature of the cooling water in continuous operation never exceeds 30°C.
In such methods the purity of the cooling water calls for special attention, and up to know it has been common practice to use tap water in large quantities because tap water meets the requirements for purity as stipulated by the health authorities.
According to the present invention, use is made of re¬ circulated cooling water, which is regenerated and cooled continuously.
This method is very economical, in part because tap water is becoming an expensive commodity, and in part because a better utilization of waste heat is achieved.
According to the invention, the regeneration may consist in decomposition or removal of the calcium from the cooling water.
Calcareous deposits on the tools are hereby avoided.
In addition hereto, the regeneration according to the in-
vention may consist in radiation of the cooling water with ultra-violet light.
It is hereby possible to sterilize the water to such a degree that it meets the standards established by the health authorities.
A decisive embodiment of the method according to the inven¬ tion consists in that in the event of an interruption of operation - intended or unintended - cooling of the cool¬ ing water continues for so long that the temperature of the tools decreases to about 30°C.
Since the tools are normally operated under a temperature of between 90-120°C, calcareous deposits may occur follow¬ ing an interruption of operations because calcareous de¬ posits may occur already at temperatures of app. 45°C. By carrying out a subsequent cooling to the effect that the tools are brought down below this temperature relatively fast, the calcareous deposits are to a large extent re¬ duced.
The invention also relates to a cooling unit for use in the implementation of the invention, and the cooling unit is advantageous in that the unit has means for recirculation and continuous regeneration of the cooling water, as well as means for cooling down the cooling water, in addition to which the cooling unit may have means for decomposition of calcium carbonat or radiation of the cooling water with ultraviolet light.
The method according to the invention and a cooling unit for use in the implementation of the method will be explained below in the detailed description with reference to the drawing, wherein
Fig. 1 is a schematic illustration of a prior art cooling unit,
Fig. 2 is a schematic illustration of a recirculation unit according to the invention.
Fig. 1 illustrates a prior art cooling unit comprising an apparatus 14, which contains welding or moulding tools for use in the drug or food industry. The temperature of these tools is app. 90-120°C during operation and must be cooled by means of cooling water in order to maintain this tem¬ perature. In view hereof, the cooling unit has an open water tank 15, which serves as a cooling water reservoir for the apparatus 14.
A pump 6 is connected to the water tank 15 and is adapted to pump the cooling water from the water tank 15 to the apparatus 14 through an inlet 13, whereupon the cooling water is discharged to the atmosphere through an outlet 12. The water tank 15 therefore must be replenished con¬ tinuously in order to compensate for the loss of cooling water, which is in part discharged and in part evaporates during operation of the apparatus 14 and from the open water tank 15.
The loss of cooling water is compensated for by intake of tap water through a feed pipe 2 as a float valve 1 has sunk to a predetermined lower level in the water tank 15. Thus clean and fresh tap water is fed continuously into the re- circulation unit and together herewith, also calcium from the calcareous tap water.
At the temperature indicated the cooling water will deposit calcium on the machine tools, since such deposits will take place already at temperatures of app. 45°C. Thus a steadily increasing layer of calcium will deposit on the
machine tools, and this calcium must be removed from time to time in order to reduce the comsumption of energy necessary for heating the machine tools.
Removal of the calcium in the known recirculation unit in¬ volves a considerable amount of labour, and the discharge of cooling water a considerable waste of water.
In the recirculation unit illustrated in Fig. 2 according to the invention the calcium deposit is reduced to a mini¬ mum, and therefore this unit is considerably more economi¬ cal in operation, discharge of the tap water is avoided during recirculation and sterilization of the cooling water, and a satisfactory • level of purity and a quality, which meet the requirements stipulated by the health authorities is achieved.
The recirculation unit according to invention also com¬ prises a water tank 15, which can be replenished with tap water through a feed pipe 2, which opens by means of a float valve 1, and the cooling water is pumped into the en¬ tire unit by means of a pump 6.
The cooling water is led through an inlet 19, a thermostat 9 and a calcium decomposition element 7, wherein the calcium is removed from the cooling water, whereupon the cooling water is led further through the pump 6 and the inlet 13 to the apparatus 14, wherein the machine tools are cooled, the cooling water being at the same time heated to app. 20°C. The heated cooling water is returned through an outlet 12 and another calcium decomposition element 11 to an evaporator 16 provided in the water tank 15, the heat from the cooling water being utilized to evaporate freon in the evaporator 16. The freon is led through the evaporator 16 in the direction opposite the direction of flow of the cooling water, which will cause the heat from
the cooling water to get into contact with as much freon as possible. In the evaporator 16 the cooling water is led through a pipe provided with an undulating wall, or similar formed wall, in order to obtain the maximum surface possible for the heat exchange.
The cooling water leaves the evaporator 16 at a temperature of app. 20°C through a water outlet 20, which is so formed that the water circulates around in the water tank 15 to the effect that a whirl is created. This causes the water in the water tank 15 to be moving constantly. In the water tank is further provided an element 10 for emittance of ultraviolet radiation which serves to sterilize the water in the water tank 15, and this sterilization process is im- proved due to the constant movement of the water.
The heated or evaporated freon is then cooled down in a per se commonly known cooling unit comprising a condensor 3, a motor-driven fan 18, a pipe line 21, a compressor 4, a re- ceiver 5 and a valve 8.
The cooling unit may advantageously be provided with wheels, thus rendering the apparatus mobile.
Claims
1. Method of preventing calcareous deposits on heated, water-cooled tools, for example welding or moulding tools for use in the drug and food industry, or rollers or bearings for use in the graphic industry, where the cool¬ ing water is used to ensure a particular temperature and an even distribution of temperature, the temperature of the tool being app. 90-120°C, whereas the temperature of the cooling water in continuous operation never exceeds 30°C, characterized in that use is made of recirculated cooling water, which is continuously regenerated and cooled down.
2. Method according to claim 1, characterized in that the regeneration of the cooling water comprises decomposition or removal of calcium from the cooling water.
3. Method according to claim 1 or 2, characterized in that the regeneration of the cooling water comprises ultra¬ violet radiation.
4. Method according to claim 1, 2 or 3, characterized in that in the event of an interruption of operation intended or unintended - cooling of the cooling water con¬ tinues for so long that the temperature of the tools de¬ creases to app. 30°C.
5. Method according to one or more of the preceding claims, characterized in that the heat led away with the cooling water is reused.
6. Cooling unit for use in the implementation of the method of claim 1, characterized in that the unit has means (6, 12, 13, 19, 20) for recirculation and continuous re¬ generation of the cooling water and has means (3, 4, 5, 8, 16, 18) for cooling down the cooling water.
7. Cooling unit according to claim 6, characterized in that the unit has means (7, 11) for decomposition or removal of calcium from the cooling water.
8. Cooling unit according to claims 6 or 7, characterized in that the unit has means (10) for radiation of the cool¬ ing water with ultraviolet light.
9. Cooling unit acording to claim 6, or 8, characterized in that the unit has a cross heat exchanger (16), which is adapted to transfer heat from the cooling water into for example water for domestic use.
10. Cooling unit according to one or more of the claims 6- 9, characterized in that the unit is mobile, for example supported on wheels.
11. Use of the cooling unit according to claims 6-10 for recirculation of cooling water for cooling of heated, water cooled machine trols for use in the drug or food industry to secure a particular temperature and an even distribution of temperature in the machine tools.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU55760/94A AU5576094A (en) | 1992-11-12 | 1993-11-10 | Method of avoiding calcareous deposits on heated, water-cooled tools, cooler for the implementation of the method and use of said cooler |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK9200251 | 1992-11-12 | ||
| DK9200251U DK9200251U3 (en) | 1992-11-12 | 1992-11-12 | GHT Rec. unit. Recirculation and cooling of cooling water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1994011306A1 true WO1994011306A1 (en) | 1994-05-26 |
Family
ID=8153966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DK1993/000367 WO1994011306A1 (en) | 1992-11-12 | 1993-11-10 | Method of avoiding calcareous deposits on heated, water-cooled tools, cooler for the implementation of the method and use of said cooler |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU5576094A (en) |
| DK (1) | DK9200251U3 (en) |
| WO (1) | WO1994011306A1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1981002529A1 (en) * | 1980-03-12 | 1981-09-17 | White Light Ind Inc | Magnetic water conditioner apparatus |
| GB2179128A (en) * | 1985-06-18 | 1987-02-25 | Paxman Briston Coolers Ltd | Apparatus for cooling liquids |
| US4850427A (en) * | 1986-12-24 | 1989-07-25 | Commissariat A L'energie Atomique | Device for controlling overheating and scaling in an apparatus for heating a fluid and apparatus equipped with such a device |
| EP0346540A1 (en) * | 1988-06-15 | 1989-12-20 | NUMOR SYSTEMS COMPANY, a Michigan Co-Partnership | Coolant processing system |
| US5184471A (en) * | 1991-07-08 | 1993-02-09 | Ocs Industries, Inc. | Food products chiller and method of using the same |
-
1992
- 1992-11-12 DK DK9200251U patent/DK9200251U3/en not_active IP Right Cessation
-
1993
- 1993-11-10 AU AU55760/94A patent/AU5576094A/en not_active Abandoned
- 1993-11-10 WO PCT/DK1993/000367 patent/WO1994011306A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1981002529A1 (en) * | 1980-03-12 | 1981-09-17 | White Light Ind Inc | Magnetic water conditioner apparatus |
| GB2179128A (en) * | 1985-06-18 | 1987-02-25 | Paxman Briston Coolers Ltd | Apparatus for cooling liquids |
| US4850427A (en) * | 1986-12-24 | 1989-07-25 | Commissariat A L'energie Atomique | Device for controlling overheating and scaling in an apparatus for heating a fluid and apparatus equipped with such a device |
| EP0346540A1 (en) * | 1988-06-15 | 1989-12-20 | NUMOR SYSTEMS COMPANY, a Michigan Co-Partnership | Coolant processing system |
| US5184471A (en) * | 1991-07-08 | 1993-02-09 | Ocs Industries, Inc. | Food products chiller and method of using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| AU5576094A (en) | 1994-06-08 |
| DK9200251U3 (en) | 1992-12-28 |
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