EP3220089A1 - System und verfahren zum reinigen eines wärmetauschers - Google Patents

System und verfahren zum reinigen eines wärmetauschers Download PDF

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Publication number
EP3220089A1
EP3220089A1 EP16305302.8A EP16305302A EP3220089A1 EP 3220089 A1 EP3220089 A1 EP 3220089A1 EP 16305302 A EP16305302 A EP 16305302A EP 3220089 A1 EP3220089 A1 EP 3220089A1
Authority
EP
European Patent Office
Prior art keywords
supply
cleaning
duct
heat exchanger
discharge
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.)
Granted
Application number
EP16305302.8A
Other languages
English (en)
French (fr)
Other versions
EP3220089B1 (de
Inventor
Olivier Thierry PEIFFER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Polimiroir
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Polimiroir
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Publication date
Application filed by Polimiroir filed Critical Polimiroir
Priority to EP16305302.8A priority Critical patent/EP3220089B1/de
Publication of EP3220089A1 publication Critical patent/EP3220089A1/de
Application granted granted Critical
Publication of EP3220089B1 publication Critical patent/EP3220089B1/de
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Anticipated expiration legal-status Critical

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D11/00—Heat-exchange apparatus employing moving conduits
    • F28D11/02—Heat-exchange apparatus employing moving conduits the movement being rotary, e.g. performed by a drum or roller
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F5/00—Elements specially adapted for movement
    • F28F5/02—Rotary drums or rollers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G15/00—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G15/00—Details
    • F28G15/003—Control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents

Definitions

  • the invention relates to a cleaning system for a cylindrical heat exchanger of the rotary industrial roller type.
  • the industrial roller ensuring the path of such a film is in this case a heat exchanger comprising two concentric inner and outer cylindrical walls, channels housed in the space defined between the inner and outer walls and in which can circulate a heat transfer fluid ensuring a heat exchange with the outer cylindrical wall, the exchanger further comprising at least one conduit for supplying heat transfer fluid channels via supply tubes, each connecting the supply duct to the inlet of a channel, and at least one duct for evacuating the heat transfer fluid channels via evacuation tubes, each connecting the outlet of a channel to the evacuation duct.
  • the circulation of the heat transfer fluid in the channels ensures the stability and the uniformity of the temperature of the entire external surface of the external wall of the heat exchanger, ensuring the uniform cooling of the hot extruded film conveyed by the heat
  • the heat transfer fluid is treated to contain as few impurities as possible, it is common for material deposits to reduce the cross section of the channels, including scale deposits, rust, grease or oil, of bacteria. This causes a decrease in the flow of heat transfer fluid circulating in this channel and therefore a decrease in heat exchange between the heat transfer fluid and the film to be cooled. The temperature of the fluid flowing in this partially clogged channel therefore tends to increase, thus affecting the uniformity of the temperature of the outer surface of the outer wall of the heat exchanger and the proper cooling of the hot extruded film.
  • the present invention aims to overcome the above disadvantages of the prior art.
  • the invention relates to a cleaning system of a rotary cylindrical heat exchanger as described above, the cleaning system comprising a removable closure means for insertion into the supply duct to seal the inlets of the supply tubes connected to the supply duct, and cleaning ducts each connected to a supply tube downstream of its inlet and arranged to be connected to a source of a cleaning fluid for injecting the cleaning fluid; cleaning that can circulate in the corresponding channel and the evacuation tube to the cleaning fluid evacuation duct.
  • the cleaning system comprises a device for monitoring the temperature of the coolant circulating in the channels and comprising temperature sensors, each of which makes it possible to periodically measure the temperature of the coolant circulating in the corresponding evacuation tube, and an external processing unit of the temperature data from the temperature sensors and arranged to generate information of the need for cleaning at least one channel when the temperature of the coolant in the corresponding discharge tube exceeds a value temperature threshold stored in the temperature data processing unit.
  • each temperature sensor comprises a probe in contact with the corresponding discharge tube and an acquisition unit of the temperature data measured by the probe housed in a compartment of the heat exchanger, the unit of acquisition being arranged to transmit periodically to the processing unit the acquired temperature data.
  • the communication between the data acquisition means and the data processing means is of the wireless type.
  • the removable closure means comprises a rod whose end portion comprises seals for sealing the inlet of the supply tubes.
  • the supply and discharge ducts are cylindrical.
  • the heat exchanger comprises a pair of respectively supply and discharge conduits disposed at one end of the heat exchanger.
  • the two supply and discharge ducts respectively arranged at the same end of the heat exchanger are mounted concentrically, the diameter of the discharge duct being greater than the diameter of the supply duct so that the evacuation of heat transfer fluid or cleaning fluid is carried out along the annular space formed between the two walls of the two ducts respectively supply and discharge.
  • each supply tube is connected at its inlet radially to the exhaust duct, and each evacuation tube is connected at its output radially to the exhaust duct.
  • the heat exchanger comprises a feed duct disposed at one end of the heat exchanger and a discharge duct disposed at the opposite end of this exchanger.
  • the channels of the heat exchanger are constituted by metal strips spirally wound around the inner cylindrical wall of the heat exchanger defining between them the coolant circulation channels and which are welded to the surface external of this inner cylindrical wall.
  • the heat exchanger comprises six channels.
  • the heat exchanger comprises eight channels.
  • the cleaning fluid has detergent and / or descaling and / or rustproofing properties.
  • such a heat exchanger 1 is used in particular to uniformly cool films of low thermal conductivity material, including hot-extruded plastic films.
  • the heat exchanger 1 comprises two inner cylindrical walls 2 and outer 3 concentric with their two opposite ends of two transverse walls 32.
  • the inner cylindrical wall 2 rests at each of its opposite ends on convex internal shoulders formed in the corresponding transverse wall 32 of the heat exchanger 1 and is fixed to these shoulders by welding.
  • the two inner cylindrical walls 2 and outer 3 define between them an annular space.
  • the two transverse walls 32 protrude radially from their outer peripheral edge 32b of the outer peripheral surface of the inner cylindrical wall 2.
  • the outer cylindrical wall 3 rests at each of its two opposite ends on the outer peripheral edges 32b of the transverse walls 32 and is attached thereto by welding.
  • the heat exchanger 1 further comprises circulation channels 4 of a heat transfer fluid, housed in the annular space between the inner cylindrical walls 2 and outer wall 3 so that the heat transfer fluid flowing in these channels 4 ensures an exchange thermal device with the entirety of the outer cylindrical wall 3.
  • these channels 4 are constituted by rigid metal strips 4b spirally wound around the inner cylindrical wall 2 defining between them the circulation channels 4 of the coolant.
  • the metal strips 4b are on the one hand supported by their edges on the same side on the outer surface of the inner cylindrical wall 2 of the heat exchanger 1 and welded to this surface, and on the other hand supported by their opposite edges on the inner surface of the outer cylindrical wall 3. Therefore, the metal strips 4b are sealingly fixed between the two inner and outer walls 2 to define the individual channels 4.
  • the flow of coolant in the channels 4 is provided by a heat transfer fluid supply duct 5 via supply tubes 6, each connecting the supply duct 5 to the inlet 7 of a channel 4, and by a heat transfer fluid discharge duct 8 via discharge tubes 9, each connecting the outlet 10 of a channel 4 to the discharge duct 8.
  • the inlet 7 and the outlet 10 of a channel 4 are formed by radial holes made in the inner cylindrical wall 2 in the vicinity respectively of the ends of the inner cylindrical wall 2, that is to say that these radial holes 7, 10 respectively open at both ends of the spiral of the corresponding channel 4.
  • the supply and exhaust ducts 8 consist of rigid cylindrical and concentric tubes, and the exhaust duct 8 is plugged at an end opposite to that for the discharge of heat transfer fluid through a closure wall 11 welded to the corresponding end of the exhaust duct 8.
  • These two ducts 5, 8 are arranged at one end of the heat exchanger 1 coaxially with the axis of rotation XX 'of the exchanger 1. More specifically, the exhaust duct 8 whose diameter is greater than the diameter of the supply duct 5 through the corresponding transverse wall 32 and is secured thereto by welding.
  • This exhaust duct 8 also serves as a half axis of rotation of the heat exchanger 1.
  • the supply duct 5 extends in the evacuation duct 8 over a large part of the length of the latter and at its end opening facing the transverse closing wall 11 of the evacuation duct 8.
  • This end of the supply duct 5 comprises a metal ring 17 integral with this end and which comprises an O-ring seal (not shown) resting on the internal surface of the evacuation duct 8.
  • this supply duct 5 is integral with a circular cover 18 removably attached to a flange 19 secured to the corresponding end of the exhaust duct 8, the cover 18 allowing the passage of a means of removable closure of the supply tubes 6 as will be seen later.
  • Each supply tube 6 is connected at its inlet 14 radially to the exhaust duct 8 via radial holes 13 positioned downstream of the O-ring with respect to the direction of flow of the coolant in the supply duct 5, which radial holes 13 open into the chamber 12 defined between the O-ring and the closure wall 11 of the exhaust duct 8.
  • the coolant coming from the supply duct 5 is distributed in the supply tubes 6 in the direction of the entrance 7 of the channels 4.
  • Each discharge tube 9 is connected at its outlet 16 radially to the exhaust duct 8 via radial holes 15 positioned upstream of the O-ring with respect to the direction of flow of the coolant in the supply duct 5. So, the coolant having circulated in the evacuation tubes 9 from the outlet 10 of the channels 4 flows at the outlet of the evacuation tubes 9 into the annular space E defined between the supply and evacuation ducts 8 for be evacuated into the exhaust 8.
  • the heat exchanger 1 comprises between six and eight channels 4, with as many feed tubes 6 as of the channels 4 and as many evacuation tubes 9 as channels 4.
  • the coolant is for example a low viscosity liquid and purified, for example distilled water treated to prevent the deposition of biological material in the channels 4 and to avoid the best deposition of limestone in the channels 4.
  • the supply duct 5 is connected to a coolant supply source, not shown.
  • the heat transfer fluid is in turbulent flow in the channels 4.
  • the flow directions of the heat transfer fluid in two adjacent channels are opposite.
  • the configuration of the feed tubes 6 shown in FIG. Figure 1A illustrates a configuration of the feed tubes 6 for this situation.
  • a turbulent flow of coolant in the channels 4 is obtained for heat transfer fluid flow rates exceeding a certain value depending on the section and the length of each channel 4.
  • this threshold speed is between 1.5 and 3 m / s for a pressure of between 3 and 4 bars.
  • the heat exchanger 1 also comprises a second half-axis 34 passing through the other transverse wall 32 and secured thereto by welding. This half-axis also allows the rotation of the cylindrical heat exchanger 1.
  • This device comprises a device for monitoring the temperature of the coolant circulating in each channel 4.
  • This device comprises temperature sensors 21, 22 each for periodically measuring the temperature of the coolant circulating in the evacuation tube 9 corresponding to a channel 4.
  • Each temperature sensor comprises a temperature sensor 21 in contact with the corresponding discharge tube 9 and an acquisition unit for the temperature data 22 measured by the probe 21.
  • This acquisition unit 22 is housed in a compartment of the Heat exchanger 1.
  • the acquisition unit 22 of a temperature sensor is arranged to periodically transmit the acquired temperature data to an external processing unit of the temperature data 23.
  • This external data processing unit temperature 23 is arranged to generate information on the need to clean at least one channel 4 when the temperature of the coolant in the corresponding discharge tube 9 exceeds a temperature threshold value stored in the external processing unit 23.
  • the acquisition period of the temperature data by the acquisition units 22, as well as the period of transmission of the temperature data by the acquisition units 22 to the external processing unit 23 may be parameterized by the user.
  • the temperature data are transmitted to the external processing unit 23 via a connection of the wireless type, for example WIFI or Bluetooth.
  • covers 35 are removably attached to the corresponding transverse end wall 32 of the heat exchanger 1. These covers 35 respectively close circular windows 33 passing through the transverse wall 32 , in particular to access the temperature sensors.
  • a temperature of the coolant which increases in a channel 4 means that the flow velocity of the fluid in this channel 4 decreases to the point of becoming laminar. This is due to the narrowing of the cross section of the channel 4 caused by deposits of material in the channels, for example scale, rust, grease or oil, bacteria.
  • the cleaning system furthermore comprises the previously mentioned removable closure means that the user inserts into the supply duct 5 through a central bore 20 passing through the cover 18 closing the inlet of the supply duct 5, to seal the inlets 14 of the supply tubes 6 hermetically connected to the supply duct.
  • this removable means comprises a rod 24 whose end portion comprises seals 25 which, once the rod 24 is in place in the feed duct 5, hermetically seals the radial holes 13 of the exhaust duct 8 located downstream of the O-ring with respect to the direction of fluid flow in the supply pipe 5.
  • the end portion of the rod 24 further comprises a clamp 26 which can be actuated by the user via an external handle 27 of the quarter-turn type to radially reinforce the seal 25.
  • the cleaning system comprises cleaning lines 28 each connected to a tube of supply 6 downstream of its input.
  • Each cleaning pipe 28 is accessible at one of the ends of the heat exchanger 1, through the circular windows 33 of the corresponding transverse wall 32.
  • each cleaning pipe 28 is arranged to be connected to a external source of cleaning fluid (not shown) to allow the injection of this fluid into the corresponding feed tube 6.
  • Each cleaning line 28 comprises an elbow tube 29 connected at its outlet radially to the wall of the corresponding supply tube 6.
  • the inlet of the cleaning line 28 comprises a male or female connector 30 intended to cooperate with a connector connected to the outlet of the cleaning fluid source.
  • a rigid plane support 31 is integral with each cleaning line 28 near its end and the corresponding feed tube 6.
  • the supply and evacuation tubes 6 are arranged so that one half of the set of tubes respectively supply 6 and discharge 9 is accessible through the circular windows 33 of the one of the transverse end walls 32 of the heat exchanger 1, the remaining half of this set of tubes respectively supply 6 and discharge 9 being accessible through the circular windows 33 of the other end transverse wall 32 of the heat exchanger 1.
  • the cleaning system according to the invention makes it possible to detect very rapidly losses of flow of coolant circulating in the partially clogged channel (s) 4. Indeed, when one of the channels 4 is partially clogged, the temperature sensor 21 supplies the acquisition unit 22 with a temperature signal which is transmitted to the external processing unit 23 providing information identifying the channel 4 partially obstructed, for example by display.
  • the cleaning lines 28 and the removable closure means make it possible to inject cleaning fluid only into the channels 4 which are the subject of cleaning and / or descaling, significantly increasing the efficiency of the cleaning of the channels. The consumption of cleaning fluid and the injection volume of the latter in the channels 4 to be cleaned are therefore optimized, particularly avoiding any overconsumption of cleaning fluid.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP16305302.8A 2016-03-18 2016-03-18 System und verfahren zum reinigen eines wärmetauschers Active EP3220089B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16305302.8A EP3220089B1 (de) 2016-03-18 2016-03-18 System und verfahren zum reinigen eines wärmetauschers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16305302.8A EP3220089B1 (de) 2016-03-18 2016-03-18 System und verfahren zum reinigen eines wärmetauschers

Publications (2)

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EP3220089A1 true EP3220089A1 (de) 2017-09-20
EP3220089B1 EP3220089B1 (de) 2018-08-08

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115682780A (zh) * 2022-11-30 2023-02-03 华能烟台八角热电有限公司 一种高温管式换热器及其清洗方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3187809A (en) * 1963-01-11 1965-06-08 Inta Roto Machine Company Inc Heat-exchange roll and method of making
DE3315376C1 (de) * 1983-04-26 1984-08-16 Mannesmann AG, 4000 Düsseldorf Stranggiessrolle
US5292298A (en) * 1993-01-06 1994-03-08 Roll Service Incorporated Heat transfer roll
WO2015181691A1 (en) * 2014-05-26 2015-12-03 Cos.T.A. S.R.L. Thermostatically controlled cylinder for heat treatments, method for making said cylinder and system comprising said cylinder

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3187809A (en) * 1963-01-11 1965-06-08 Inta Roto Machine Company Inc Heat-exchange roll and method of making
DE3315376C1 (de) * 1983-04-26 1984-08-16 Mannesmann AG, 4000 Düsseldorf Stranggiessrolle
US5292298A (en) * 1993-01-06 1994-03-08 Roll Service Incorporated Heat transfer roll
WO2015181691A1 (en) * 2014-05-26 2015-12-03 Cos.T.A. S.R.L. Thermostatically controlled cylinder for heat treatments, method for making said cylinder and system comprising said cylinder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115682780A (zh) * 2022-11-30 2023-02-03 华能烟台八角热电有限公司 一种高温管式换热器及其清洗方法

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