Bayerische Textilwerke Lothar Lindemann (Germany)

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1. Case study or Built example

Case study


2. Industry Sector

Textile printing (finishing) of woven fabric (bed linen, furnishing fabric and lining).


3. Industrial application

Heat recovery system with waste water from desizing and bleaching plant.


4. Process description
  • Flowsheet


Flowsheet-Bayerische Textilwerke.jpg


  • Processes

Production is done in one-shift, 5 days per week Production in 1999: 7 575 000 m2 fabric or 1100 tons

Processed fibres: [mass%]

CO 70 %
CV 5 %
PES/CO 20 %
CO/CV 5 %

All printing-fabric has to be pre-treated. Pre-treatment has a big influence on printing quality, which means on the quality of the finishing process.

A main point is the fabric surface. To make it clean, smooth and lint-free, it is being singed. To guarantee constant suction, the fabric is desized and scoured, to remove fats, waxes, proteins etc. With these measures, it can be made sure that the printing colours that are applied later on will be fast and completely absorbed by the material. The whiteness can be increased by peroxide-bleaching (event. addition of optical brighteners).

If the dye-uptake of cotton has to be improved, the fabric is mercerised after bleaching (treatment with concentrated NaOH under friction), rinsed and dried again. Raising can be necessary.

After printing, the fabric is steamed (reactive printing) or fixed (pigment printing). With reactive printing, the thickening agent, the fixation auxiliaries and not-fixed dyestuff are removed during the after-washing. With pigment-printing, there is no after-printing, all the substances that were added during printing, remain on the fibre.

During finishing, the fabric undergoes final treatment and quality control, before it is delivered to the customers.

The following finishing-aggregates are in use:

Bleaching 1

Steaming 1

Desizing 1

Fixation machine 1

Dryer 1

Printing machines 2

Mercerising machine 1

Singeing 2

Stenter frames 2

Washing machines 1


5. Energy flows and temperature ranges
  • Main heat supply system and fuel:

Energy supply: natural gas, fuel oil and electricity

Heat production:steam, thermo-oil and direct firing (Stenter frame); several de-central heat-recovery systems in the field of pre-treatment, steam boiler and thermo-oil producer

Total energy consumption in 1999: 16 369 MWh (58 MWH [0,35%] fuel oil, 11,7% electricity and 14 403 MWh [almost 88%] natural gas) Total electricity consumption in 1999: 1908 MWh

  • Energy consumption:

Electricity consumption 1999:


Electricity consumption 1999-Bayerische Textilwerke.jpg


Electrical power of certain electrical loads:


Electrical power of certain electrical loads-Bayerische Textilwerke.jpg


Consumption of natural gas / fuel oil:


Consumption of natural gas-Bayerische Textilwerke.jpg


  • Temperature ranges and other parameters:

No information is available.


6. New technology’s description
  • Picture of the scheme


Picture of the scheme Bayerische Textilwerke.jpg


Scheme: heat - exchanger Desizing / Bleaching


  • Description

Desizing and Bleaching plant

Waste water of desizing and bleaching plant is piped to a central heat-recovery aggregate (spiral heat-exchanger). The waste water flow is 7 m3/h (60°C) for 1540 hours per year. The heated fresh water is piped over the heat-recovery of the thermo-oil boiler. In the aggregates the heated fresh water is further heated to a process temperature 95°C with steam.

In addition there are heat-recovery-systems for the off-gas of steam-boilers 1 and 2 and for the thermo-oil boiler. For the waste-water from the Washing machine and from Mercerising there is a de-central plate heat-exchanger.


7. Energy savings
  • Pinch analysis results

No information is available.


  • Energy savings:

Recovered heat-quantity: 185 500 kWh per year


8. Economic evaluation
  • Economic parameters:

No information is available.


Source: “Potential for the reduction of CO2 emissions through rational energy use in textile finishing”, Bavarian Federal Office for Environmental Protection, December 2000, Bavaria, Germany (“CO2-Minderungspotentiale durch rationelle Energienutzung in der Textilveredelungsindustrie”, Bayerisches Landesamt für Umweltschutz, Dezember 2000, Bayern, Deutschland)


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