A better tomorrow can be built today, but only with everyone working towards that goal. With this in mind, the theme chosen for the 2015 Milan Universal Exposition is FEEDING THE PLANET, ENERGY FOR LIFE, embracing not only food, but also, and above all, environmental protection and renewable energies. All sectors should contribute to this effort, and also industrial laundries can do their bit by making energy savings and reducing pollutant emissions, hence reducing their production costs.
Over the past few decades the industrial laundry sector has undergone a complex economic transformation in terms of organization and production. The indicators for production per capita and energy consumption per kg of goods laundered have relentlessly supplanted rationales more closely related to individual and/or production line performance measurement.
In view of the market price trends, energy-saving measures are meant to be one of the main variables on which economic efforts such as modernizing the machine stock should be focused in order to maximize their positive effects on production related costs.
The sector moves quickly towards an industrial model capable of reducing polluting emissions (White Certificates) and of fully exploiting the produced energy by recovering and re-using this energy wherever possible.
Different technologies have been developed with the objective of reducing the energy required for the various production processes. Economies can be made both by optimizing energy management in order to limit energy wastage and by converting energy from one form in another in a more efficient way.
Since its beginnings Kannegiesser has provided solutions which, besides being highly efficient and reliable over time, are designed for reducing consumption of energy resources and for preventing pollution. Years of research and development enable the company to offer a complete range of equipment capable to maximize energy savings and to convert energy so that it can be re-used in the following working processes.
a. REDUCING WASTE
– Continuos batch washing system PowerTrans PLUS
The PowerTrans PLUS is available with different rinse technologies, i. e. version CFR with counter flow rinsing, version SBR with standing bath rinsing and version JET-P and/or JET-C with rinsing in the extraction press or centrifuge, always depending on the specific customer applications and fully developed for rinse performances that could not be achieved until now.
The modern PowerTrans PLUS JET batch washers are capable to reduce water consumption to up to 3 liters per kg of goods laundered hence substantially reducing the quantity of steam required for the heating of the compartments at the same temperature.
Closed storage systems for water recovery maintain the temperature at a constant level and ensure a low impact on the surrounding environment, such as the “Cockpit” water recovery tanks with a significant energy and water saving potential. The standard version of the PowerTrans is equipped with up to two recovery tanks in a space-saving position underneath the loading chute.
Additionally individual silo tank solutions become more and more important, either as extension for a single batch washer or as a central water management system for the complete laundry.
– Water extraction systems: PowerDry.II dryer series
The growing quantities of terry cloth in the hotel sector generates an ever-increasing demand for dryers in line with the continuous batch washing system.
The dryer series PowerDry.II in the ECO2power execution is the practical implementation of the energy conservation concept. The heated air of the drying process is forcibly transferred to the recovery system by means of a flap (EAC-system) and distributed in the dryer drum with automatic volume adaption of the outgoing and the circulation air according to the drying cycle (temperature curve)
The drum rotation speed is determined by the drying process: wet material needs a higher rotation speed whilst drier material requires a lower speed. The linen dropping curve must always be transversal in order to ensure that every single item can be reached by the heated air.
This procedure considerably reduces the volume of emissions into the atmosphere since a large part of the heated air, which normally is exhausted after the first run-through, will be re-used for the following steps, thus reducing the exhaust volume by as much as two-thirds. Modern monitoring devices such as infrared sensors of the PowerDry.II InfraTouch system allow the exact determination of linen temperature throughout the drying cycle, thus avoiding overdrying with its expensive consequences.
The PLC control systems are constantly monitoring the incoming information from the infrared sensors, the inlet/outlet air temperature probes and the recycling flap for an appropriate regulation of the heat capacity of the energy sources (burner).
b. ENERGY CONVERSION
Notwithstanding the individual heat recovery systems, a lot of the energy produced by the different machines is not used. Generally this energy is released to the atmosphere by the exhaust air of ironers, dryers and tunnelfinishers as well as by the waste water of tunnelwashers and washer-extractors.
By employing modern energy conversion technologies Kannegiesser developed a heat recovery system (EMS) with the following characteristics:
1) At the end of the washing process the waste water flows down a special drain pipe to a heat exchanger where the warmth of the drain water warms up the fresh water. The pre-warmed fresh water is then stored in the above described “Silo” tank system.
2) The exhaust air produced during the ironing and finishing process (exhaust emission temperature 120° C) passes through a condensation heat exchanger by which the heat of the exhaust air is transferred to the incoming fresh water, reducing the temperature of the exhaust air to about 70° C and increasing the temperature of the outgoing water. The outgoing warm water is conducted into the “Silo” tank system and there heats up the water intended for the washing processes referred to in point 1) by means of a heat exchanger.
The return on investment of a system of this type is estimated at 100% over a period of about 3 years of operation. We may therefore say that, with the help of modern Kannegiesser technologies, today it is possible to substantially reduce the operating costs and the volume of emissions into the atmosphere of an industrial laundry whilst creating a better working environment.
In simple terms, it costs just a few cents per kg of laundered goods to get complete investment recovery and secure earnings for the subsequent years with tangible benefits for everyone without waiting for the future to arrive: Energy for live – both for the laundry and the environment.
Kannegiesser Italia S.r.l.
Via Cesare Pavese 1/3
I – 20090 Opera Mi
Tel/Ph. +39 02 57606000
Fax + 39 02 57604933
Detergo Magazine – November 2013