Difference between revisions of "Cleaning of production halls and equipment with solar integration"

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!colspan="6"|Different process technologies exist within industry, which lead to several possibilities for the integration of solar heat. Based on the general classification of industrial heat consumers cleaning processes are assigned either to the category “(pre)heating of fluid streams” or “heating and maintaining temperature of baths, machineries or tanks”. By consideration of the conventional heat supply, different integration concepts are possible.
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|[[File:CIP.jpg]]
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|Example how to integrate solar heat for cleaning in place installations (CIP) in Food and beverage companies.
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|[[File:PL_E_PM.jpg]]
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|'''PL_E_PM - external HEX for heating of product or process medium'''
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This integration concept is basically the easiest since an additional solar driven heat exchanger is installed in serial to the conventional heat exchanger to heat a product or process medium (e.g. water, lye, fruit juice, etc.). It can be applied to all three categories of heat consumers “(pre)heating of fluid streams”, “heating and maintaining temperature of baths, machineries or tanks” and “thermal separation processes”. The serial integration of a solar driven heat exchanger can be realized in a way that only part of the entire product or process medium stream is heated up and hence heat exchanger surface, pump and pipe dimensions can be kept small.
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Cleaning-in-Place (CIP) is a method for cleaning process plants without removing single components. Therefore different cleaning cycles (daily to weekly) can be applied. Based on the respective production section, the cleaning is done with cold or hot water. A CIP system consists of multiple recovery tanks for acid, caustic, fresh and hot water, circulation and dosing pumps, one or more heat exchangers, and some other peripherals. CIP systems have often an external heat exchanger, which heats up the various media to the required temperature before they are pumped to the plant components that have to be cleaned. Through a circulation loop, the individual recovery tanks can be heated.
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|[[File:PL_E_HB.jpg]]
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|'''PL_E_HB - external HEX for heating of bath, machinery, or tank'''
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This integration concept is used to heat baths, machineries, or tanks via an additional external heat exchanger. Therefore, the product or process medium is drawn from the bath, machinery, or tank, heated by solar energy and fed back. It’s crucial for this integration concept to identify a suitable position or point in time within the process where the temperature of the product or process medium is relatively low. Else this concept would lead to a parallel integration of solar heat to the conventional heat supply. If the product or process medium must be kept in a very narrow temperature range (due to operational issues), the resulting temperature difference for solar heating might be very small.
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CIP systems with external heat exchangers are suitable for the integration of solar heat. If there are longer periods between the cleaning phases, the recovery tanks can be preheated with a smaller sized solar heat exchanger. If the set temperature is not reached through this measure, the conventional heat exchanger can supply the remaining thermal energy.
 
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|[[File:PL_E_IS.jpg]]
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!colspan="6"|Source: Schmitt, B., 2014. Integration of solar heating plants for supply of process heat in industrial companies (in German language), Dissertation University of Kassel, Shaker Verlag, Aachen, Germany.
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|'''PL_E_IS - external HEX for heating of input streams'''
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The fourth possibility for integration of external heat exchangers is solar heating of input streams. Lots of processes require continuous or batch feed-in of product or process media streams. E.g. feed-in of fresh water for compensation of evaporation losses or fresh air for drying applications. Based on the specific process it can be reasonable to preheat these input streams. The dashed lines within the process flow sheet indicate possibilities for the conventional heating of the existing process. Possibly, this integration concept can be combined with PL_E_PM and PL_E_HB.
 
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|[[File:PL_I.jpg]]
 
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|'''PL_I- Process level with internal heat exchanger'''
 
  
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The integration of an additional heat exchanger surface within baths, machineries, or tanks is used for the category “heating and maintaining temperature of baths, machineries, or tanks”. Usually, the additional solar driven internal heating surface is installed in parallel to the conventional heat source. For this concept it is important to consider the available space in the process equipment since it is usually limited due to the treated product (e.g. metal parts) or components (e.g. stirrers, strainers, etc.).
 
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|[[File:PL_S_LP.jpg]]
 
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|'''PL_S_LP solar steam generation at low pressure'''
 
  
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For solar steam supply with reduced pressure of 1.5 - 3 bar (according to 110 - 135 °C) a kettle reboiler is required that is supplied with solar heat. Feed water or condensate is fed into the reboiler, evaporated and used to heat the process. Therefore, the conventional steam demand for injection heating is reduced. Based on the required installations this integration concept is similar to SL_S_PI on supply level. The only difference is the reduced temperature level compared to conventional steam systems in Industry. Therefore, this integration concept can also be applied under moderate climatic conditions.
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!colspan="6"|[[Solar application for cleaning]]
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!colspan="6"|Source: Schmitt, B., 2014. Integration of solar heating plants for supply of process heat in industrial companies (in German language), Dissertation University of Kassel, Shaker Verlag, Aachen, Germany.
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*Case studies
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**[[Media: BPE_BERGER.pdf | Berger]]
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**[[Media: BPE_Hütt_Brewery.pdf |Hütt Brewery]]
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**[[Media: BPE_NEP.pdf|NEP]]
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Back to [[Subsection DA food|EFFICENCY FINDER OF FOOD INDUSTRY]]

Latest revision as of 20:57, 10 February 2015

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CIP.jpg Example how to integrate solar heat for cleaning in place installations (CIP) in Food and beverage companies.

Cleaning-in-Place (CIP) is a method for cleaning process plants without removing single components. Therefore different cleaning cycles (daily to weekly) can be applied. Based on the respective production section, the cleaning is done with cold or hot water. A CIP system consists of multiple recovery tanks for acid, caustic, fresh and hot water, circulation and dosing pumps, one or more heat exchangers, and some other peripherals. CIP systems have often an external heat exchanger, which heats up the various media to the required temperature before they are pumped to the plant components that have to be cleaned. Through a circulation loop, the individual recovery tanks can be heated.

CIP systems with external heat exchangers are suitable for the integration of solar heat. If there are longer periods between the cleaning phases, the recovery tanks can be preheated with a smaller sized solar heat exchanger. If the set temperature is not reached through this measure, the conventional heat exchanger can supply the remaining thermal energy.

Source: Schmitt, B., 2014. Integration of solar heating plants for supply of process heat in industrial companies (in German language), Dissertation University of Kassel, Shaker Verlag, Aachen, Germany.


Solar application for cleaning



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