EP2632610A2 - Dispositif et procédé servant à surveiller le nettoyage - Google Patents

Dispositif et procédé servant à surveiller le nettoyage

Info

Publication number
EP2632610A2
EP2632610A2 EP11775917.5A EP11775917A EP2632610A2 EP 2632610 A2 EP2632610 A2 EP 2632610A2 EP 11775917 A EP11775917 A EP 11775917A EP 2632610 A2 EP2632610 A2 EP 2632610A2
Authority
EP
European Patent Office
Prior art keywords
detergent
cleaning
detergent solution
concentration
temperature
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.)
Withdrawn
Application number
EP11775917.5A
Other languages
German (de)
English (en)
Inventor
Peter Gattermeyer
Gerald Hoheisel
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.)
Krones AG
Flexim GmbH
Original Assignee
Krones AG
Flexim GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Krones AG, Flexim GmbH filed Critical Krones AG
Publication of EP2632610A2 publication Critical patent/EP2632610A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam

Definitions

  • the invention relates to a device, in particular to a device for producing, treating and filling liquid foods, and to a method for monitoring the cleaning of this device.
  • the containers or lines in the brewery plant are cleaned by means of a CIP ("cleaning in place") cleaning using a suitable cleaning agent
  • a suitable cleaning agent for the cleaning, in particular aqueous alkaline (eg based on NaOH) and acidic (eg. B. Based on HN0 3 ) detergent solutions used.
  • the progress of cleaning during the cleaning process and the quality of the recirculated cleaning agent is, but in the conventional systems can not be determined exactly, so that there is largely based on experience in terms of the duration and / or type of cleaning process. It is also customary to check the cleaning agent quality by random sampling between the individual cleanings via a sampling at various points in the system by manually determining the detergent concentration in the detergent solution by means of laboratory tests of the samples. However, this is on the one hand complex and very expensive, and on the other is subject to the human error factor (forgotten sampling, incorrect analysis results, communication gaps between quality control and production). Devices and methods are known from the prior art which determine the detergent concentration over the conductivity value. However, there is also the problem here that the progress of the cleaning and / or the quality of the reused cleaning agent can not be determined exactly. In addition, it can not be detected with the conventional systems and methods whether the cleaning agent has to be renewed.
  • the object of the present invention is to provide a device and a method for monitoring the cleaning of a device, with which a fast, efficient and accurate determination is made possible during the cleaning, whether the cleaning must be continued or can be stopped and / / or whether the cleaning agent must be concentrated and / or replaced before starting a new cleaning.
  • the device comprises at least one process container and / or at least one process line, a cleaning device, via which the process container and / or the process lines can be cleaned by introducing a detergent solution, a measuring device for determining a first physical substance size, a measuring device for determining a second physical substance size , as well as a measuring device for determining the temperature of the detergent solution. Furthermore, the device comprises an evaluation unit which determines the detergent concentration in the detergent solution via the first and second physical substance as well as the temperature of the detergent solution. The evaluation unit also determines the continuation or termination and / or the concentration and / or the replacement of the cleaning agent as a function of the determined cleaning agent concentration.
  • the first physical substance size is different from the second physical substance size.
  • Physical substance quantities are all physical parameters that change material-specifically with the composition, such as refractive index, electrical conductivity, density, speed of sound or transmission speed of light.
  • refractive index refractive index
  • electrical conductivity density
  • speed of sound transmission speed of light.
  • second used only to distinguish the sizes of substances, i. Do not refer to a spatial or temporal sequence.
  • both physical substance quantities are dependent on the thermodynamic state variable temperature, which is independent of the composition of the solution. Due to this temperature dependence, a measurement of the two physical substances alone is not sufficient to conclude clearly on the composition of the solution. By detecting the temperature this difficulty is eliminated.
  • the presence of the two measuring devices which have two independent physical substance sizes, i. the first and second physical substance size, determine the detergent solution, in conjunction with the temperature measurement allows a targeted and accurate determination of the detergent concentration in the detergent solution, so that on the evaluation unit of the device effectively continuing or ending the cleaning and / or concentration and / or the replacement of the detergent can be controlled / regulated.
  • the first physical substance size is the refractive index and the second physical substance size is the electrical conductivity, since these substances can be determined quickly, precisely and effectively and, for example, are not corrupted by gas fractions of the detergent solution.
  • the measuring device for determining the temperature in the measuring device for determining the first physical material size and / or in the measuring device of the second physical material size integrated. Furthermore, all three measuring devices can be integrated in one unit. Thus, a compact and inexpensive device is available.
  • the device is in particular a device for producing liquid foods, preferably a brewery plant. According to the invention, it is possible to produce any desired products in the device, for example for the chemical or pharmaceutical industry.
  • process container encompasses all types of containers in the apparatus, preferably a mash or wort boiling device / wort hotplate and / or a fermentation or storage tank and / or a bottle washing machine, ie in particular all plant parts which are subject to fouling "includes all pipes and / or connecting parts contained in the device, such as pipelines for the transport of media, educts or products, valves or connecting pieces.
  • the detergent solution is an aqueous solution comprising NaOH as a detergent.
  • NaOH alkaline cleaning agents, such as e.g. KOH, as well as acidic cleaning agents or surfactants.
  • NaOH alkaline cleaning agents
  • organic and inorganic contaminants can be effectively dissolved.
  • organic impurities such as sugar or egg whites are decomposed by NaOH, which lowers the concentration of NaOH as the active detergent in the detergent solution.
  • CO 2 may still be present in the device, which is produced during the reaction process and / or introduced into the device via the ambient air. This results in the purification with aqueous NaOH solution Na 2 CO 3 , which is additionally present in the cleaning solution.
  • This Na 2 CO 3 has a reduced or no cleaning effect compared to NaOH.
  • NaOH also referred to as an active ingredient of the cleaning agent.
  • the determination of the concentration of the NaOH liquor is also possible in particular, although the dilution effect with water due to the consumption of NaOH, as well as the increase on dissolved Na 2 C0 3 influence the refractive index and the electrical conductivity of the cleaning agent, and make it difficult to determine the NaOH concentration.
  • a much more accurate determination of the detergent concentration is possible via the evaluation unit.
  • a fast, efficient and accurate determination of the cleaning agent concentration is made possible during the cleaning, and thus it can be decided with certainty whether the cleaning must be continued or can be ended.
  • the determination of the detergent concentration is also independent of the degree of contamination of the solution, which is caused by degradation products. Dissolved ions of the degradation products, which would distort a simple conductivity measurement, and dissolved degradation products, which would distort a simple refractive index measurement, are compensated by the combination of conductivity and refractive index. Unknown decomposition products thus do not disturb the determination of the cleaning agent concentration. Furthermore, it can be determined whether the cleaning agent concentration is still sufficient for efficient cleaning, or whether the cleaning agent has to be concentrated and / or exchanged.
  • the device comprises a circulation unit with a circulation pump, via which the process container and the cleaning device are connected to one another, and wherein the circulation unit comprises a discharge line from the process container to the circulation pump, and a supply line from the circulation pump to the process container.
  • the measuring device for determining the first physical substance size and / or the measuring device for determining the second physical substance size and / or the measuring device for determining the temperature in the circulation unit, preferably in the discharge line can be located since a determination of the measurement parameters there is particularly fast and can provide accurate measurement data. Thereby, a particularly fast and efficient determination is possible, whether the cleaning must be continued or can be stopped, and / or whether the detergent must be concentrated and / or replaced.
  • the above-described objects are further achieved by a method according to claim 8. Preferred embodiments are described in the dependent claims 9 to 15, which are also included in combination with each other.
  • the method comprises the following steps: a) cleaning a device with a detergent solution, wherein the cleaning agent is chemically reacted during cleaning, b) measuring a first and a second physical substance size, and measuring the temperature of the detergent solution, c) determining the detergent concentration in the Detergent solution on the first and second physical substance size, as well as on the temperature of the cleaning solution, d) continuing or stopping the cleaning, and / or concentration and / or replacement of the cleaning agent, depending on the determined detergent concentration.
  • the method comprises a combined measurement of two independent physical entities and the temperature of the detergent solution.
  • the first physical substance is the refractive index and the second physical substance is the electrical conductivity.
  • the method is used for cleaning a device for producing liquid food, in particular a brewery plant, and wherein the process vessel is preferably a mash or wort boiling / wort heat and / or a fermentation or storage tank and / or a bottle washing machine.
  • the detergent solution is an aqueous solution comprising NaOH as a cleaning agent, and wherein the detergent solution in step b) further comprises Na 2 C0 3 .
  • step b measuring the first and second physical substance quantities, as well as the temperature of the detergent solution in step b) continuously or at intervals during the cleaning, i. takes place as a so-called inline measurement.
  • the determination of the detergent concentration in step c) can take place via a calibration curve.
  • the evaluation unit compensates for the temperature dependence of the two physical substance quantities by stored calibration curves and determines the value of the two physical substance quantities at a standard temperature, e.g. 20 ° C. Then, the determined concentration dependencies of the first and independent second physical substance quantity at the standard temperature in the evaluation unit are converted via calibration curves into the active detergent concentration in the detergent solution, so that a faster and more effective course of the process is possible.
  • the method relates to a cleaning of the device according to claims 1 to 7.
  • the measurement of the first physical substance size and / or the measurement of the independent second physical substance size and / or the temperature of the detergent solution is preferably carried out in step b) in the Circulation unit, particularly preferably in the drain line.
  • the two physical substances and the temperature can be determined quickly and selectively, and thus the method for monitoring the cleaning of the device can be carried out particularly effectively.
  • Fig. 1 a schematic sectional view of a device according to the invention
  • 2 shows a schematic sectional drawing of a refractometer for determining the refractive index
  • 3 shows a schematic diagram of the time change of the NaOH and Na 2 CO 3 concentration during the purification
  • Example 7 shows a table with measured values according to Example 2.
  • FIG. 9 shows a schematic diagram to illustrate the temperature dependence of the refractive index.
  • Fig. 1 schematically illustrates an embodiment of the present invention.
  • Device 1 here is a wort boiling device, which has a process container 4, and an inlet and a drain for the wort (not shown).
  • the wort boiling device has a heating device 2, here in the form of an internal cooker, which operates on the heat exchanger principle and is heated with a heating medium.
  • a heating medium e.g. Steam, water or thermal oil.
  • the heating medium steam in this embodiment, is supplied to the heating device via supply line 6 and discharged via discharge line 8.
  • Device 1 further comprises a riser, in which the wort heated in the heating device rises upward and is then distributed in the wort boiling device via a wort guide arranged in the upper region.
  • deposits are deposited in the heater 2 over time by burning organic matter, which deteriorates the heat transfer between the heating medium and the product, so that the heating surfaces of the heater 2 must be cleaned.
  • a cleaning unit 20 is provided in device 1, via which the cleaning agent, in this case aqueous NaOH solution, is made available during the cleaning process.
  • the device 1 contains a circulation unit 10 with circulation pump 22, via which the wort is drawn off from the container 4 via discharge line 11 during operation, and by means of the circulation pump 22 via feed line 12 again the container 4, that is, in particular the heater 2, is supplied.
  • the cleaning agent which is introduced into the circuit via the cleaning unit 20, circulates via the circulation unit 10.
  • the device 1 comprises a measuring device 14 for determining the refractive index of the detergent solution, and a measuring device 16 for determining the electrical conductivity of the detergent solution.
  • a measuring device 15 for determining the temperature of the cleaning agent solution here a temperature sensor, is present. These are arranged in the drain line 1 1 of the circulation unit 10.
  • Evaluation unit 18 is connected to the measuring devices 14 to 16, as well as to the cleaning device 20, so that data can be exchanged. Measuring devices 14 and 16 for determining the refractive index and the electrical conductivity are known in the art.
  • FIG. 2 shows a schematic representation of a refractometer which serves as a measuring device 14 for determining the refractive index of the detergent solution in the device 1.
  • the refractometer has a light source 32, a deflection device 24, a measuring window 26. Further, a double prism 28 is provided at which the light beam is refracted and split and directed to a CCD sensor 30. About the focused slit images of the refractive angle and thus the refractive index can be determined.
  • a temperature sensor 15 for measuring the temperature is integrated.
  • the method according to the invention can be carried out as follows:
  • aqueous NaOH solution is introduced via the cleaning device 20 by means of the circulation unit 10 in the process container 4 and circulated.
  • the measured data are sent to the evaluators. unit 18.
  • the measured NaOH concentration in the detergent solution is continuously determined by means of calibration curves. The thus determined NaOH concentration allows a statement about the temporal change of the NaOH concentration during the cleaning process.
  • control unit / regulation of the cleaning device 20 takes place via the evaluation unit 18, ie in particular the command to continue or cancel the cleaning, and / or to concentrate and / or exchange the cleaning agent.
  • Fig. 3 the time course of the NaOH and Na 2 CO 3 concentration in the detergent solution during the cleaning is illustrated. During this process, the NaOH concentration initially decreases while the Na 2 CO 3 concentration increases. As cleaning progresses, the concentrations of NaOH and Na 2 CO 3 in the detergent solution approach a constant value that defines the end of cleaning.
  • Figures 4 and 5 show calibration curves illustrating that both the concentration of NaOH and the concentration of Na 2 CO 3 contribute to the conductivity and refractive index measurements of the detergent solution (here at 20 ° C and 50 ° C). Using these calibration curves, the respective individual concentrations of NaOH and Na 2 CO 3 (compensated at 20 ° C.) in the detergent solution at the time of measurement can be calculated by means of the mathematical equations (i) and (ii).
  • r D 2 o correspond to the refractometer value and LF 20 of the electrical conductivity compensated to 20 ° C.
  • ⁇ to F 6 are application-specific coefficients.
  • the coefficients F 3 to F 6 can be determined from the individual dependencies of the electrical conductivity and the refractive index at several different temperatures of the Na 2 CO 3 and NaOH concentration (see Fig. 4 and Fig. 5).
  • F ⁇ [and F 2 are device-specific constants that are adapted to the process water used.
  • Fig. 8 and Fig. 9 show the temperature dependence of the conductivity and the refractive index at 2 mol% solutions.
  • Example 1 a CIP cleaning was carried out as described above in the device according to FIG. 1 on two different days and after two different processes.
  • the temperature-compensated refractive index and the temperature-compensated conductivity were determined at various points of the system, and the NaOH and Na 2 C0 3 concentration was determined.
  • samples of the cleaning agent were taken at the respective locations and the NaOH and Na 2 CO 3 concentrations were determined by means of a chemical analysis by means of titration.
  • Figs. 6 and 7 show a tabular summary of the values obtained for Examples 1 and 2.
  • the values determined show for all points in the system a good agreement of the results from the titration with the values obtained, which were obtained via a combination of conductivity with the refractive index.
  • the NaOH concentration is reproduced very accurately with the method according to the invention, i. there are smaller deviations than with a pure conductivity measurement.
  • Example 2 two additional tests were carried out, in each of which a 5% by mass NaOH solution and a 5% by mass Na 2 CO 3 solution was introduced into the already cleaned plant. It also shows a good agreement of the results from the titration with the values obtained, which were obtained via a combination of conductivity with the refractive index. In particular, the content of NaOH is reproduced very well, ie much better than with a pure conductivity measurement.

Landscapes

  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Detergent Compositions (AREA)

Abstract

L'invention concerne un dispositif, comportant au moins une cuve de traitement et/ou au moins une conduite de traitement, un système de nettoyage, par l'intermédiaire duquel la cuve de traitement et/ou la conduite de traitement peuvent être nettoyés en introduisant une solution détergente. Ledit dispositif comporte également un système de mesure servant à déterminer une première grandeur de matière physique de la solution détergente, un dispositif de mesure servant à déterminer une seconde grandeur de matière physique de la solution détergente, un dispositif de mesure servant à déterminer la température de la solution détergente, une unité d'évaluation qui détermine la concentration de détergent dans la solution détergente à l'aide de la première et de la seconde grandeur de matière physique ainsi que de la température de la solution détergente et qui détermine la poursuite ou l'arrêt du nettoyage et/ou l'ajustement de la concentration et/ou le changement du détergent en fonction de la concentration de détergent déterminée. L'invention concerne en outre un procédé servant à surveiller le nettoyage d'un dispositif, comprenant : (a) le nettoyage du dispositif (1) à l'aide d'une solution détergente, le détergent étant transformé chimiquement lors du nettoyage ; (b) la mesure d'une première et d'une seconde grandeur de matière physique ainsi que la mesure de la température de la solution détergente ; (c) la détermination de la concentration de détergent dans la solution détergente à l'aide de la première et de la seconde grandeur de matière physique, ainsi que de la température de la solution détergente ; (d) la poursuite ou l'arrêt du nettoyage, et/ou l'ajustement de la concentration et/ou l'échange du détergent en fonction de la concentration de détergent déterminée.
EP11775917.5A 2010-10-26 2011-10-25 Dispositif et procédé servant à surveiller le nettoyage Withdrawn EP2632610A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010042960A DE102010042960A1 (de) 2010-10-26 2010-10-26 Vorrichtung und Verfahren zum Überwachen der Reinigung
PCT/EP2011/005383 WO2012055542A2 (fr) 2010-10-26 2011-10-25 Dispositif et procédé servant à surveiller le nettoyage

Publications (1)

Publication Number Publication Date
EP2632610A2 true EP2632610A2 (fr) 2013-09-04

Family

ID=44872283

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11775917.5A Withdrawn EP2632610A2 (fr) 2010-10-26 2011-10-25 Dispositif et procédé servant à surveiller le nettoyage

Country Status (5)

Country Link
US (1) US20130233352A1 (fr)
EP (1) EP2632610A2 (fr)
CN (1) CN103221152A (fr)
DE (1) DE102010042960A1 (fr)
WO (1) WO2012055542A2 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014005546B4 (de) 2013-11-27 2018-07-05 Manfred Dausch Verfahren und Vorrichtung für die Reinigungsvalidierung
DE102015118619A1 (de) * 2015-10-30 2017-05-04 Krones Ag Vorrichtung zum Behandeln von Behältern
DE202016101446U1 (de) * 2016-03-16 2017-06-19 Flexim Flexible Industriemesstechnik Gmbh Prozessrefraktometer
US11231360B2 (en) * 2017-06-29 2022-01-25 Hydrite Chemical Co. Automatic titration device
CA3124284A1 (fr) 2018-12-28 2020-07-02 Asp Global Manufacturing Gmbh Indicateur de traitement, procede de production correspondant et procede d'utilisation correspondant
CN111715606A (zh) * 2020-03-30 2020-09-29 横店集团东磁股份有限公司 全自动清洗石墨舟装置及其清洗方法

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Also Published As

Publication number Publication date
CN103221152A (zh) 2013-07-24
US20130233352A1 (en) 2013-09-12
DE102010042960A1 (de) 2012-04-26
WO2012055542A3 (fr) 2012-06-28
WO2012055542A2 (fr) 2012-05-03

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