LAUNDRY INCLUDING SYSTEM OF RECUPERATION BOTH OF THE WHOLE HEAT INCLUDED IN THE AIR EXPELLED DURING DRYING

Ziel

To substitute an annual consumption of 1 300 000 El.E kilowatts-hour to an annual consumption of 3 900 000 fossilized kilowatts-hour (390 TEP per year) in a hospital-laundry whose production amounts 5 tons in a day, by the way of recuperating the latent and sensitive heat contained in the mixture of air and steam which is expelled during drying through the exchanging and condensing "ECOSPIR'. The latter raises the temperature of the washing-water to two points (40 and 65 C) by producing steam in the decentralized electric boilers with instantaneous expansionless return of the condensates by gravity ("DIRECT G" systems).
The "ECOSPIR" and "DIRECT G" systems are innovative and patented. They are capable of being turned to account in many industrial sectors.
The hospital laundry of MULHOUSE treats 5.8 tons of linen per day, that is to say 1,508 tons over the year 1991.
According to traditional processes, its consumption of gas should amount to 4,524,000 kilowatts-hour per year and its expenses about 1,628,610 FF per year (including redemption and maintenance costs).
The working up of both innovations should allow to bring the consumption of heat (as electric power) down to 1,508,00 kilowatts hour per year opposite to a cost of about 1,568,320 FF per year (including redemption and maintenance costs).
This results in a financial economy of 60,320 FF/year.
In the industry heat is generally used to create conditions of temperature or changes in states. The real useful temperature often represents a minor part of the total consumed energy. This is particularly the case in a traditional laundry in which a central oil or gas-fuelled power-station produces the quantity of steam which is necessary for heating and which expels outside an average amount of 15 000 m3 of 85 deg. air and 450 kilograms of drying steam per ton of treated linen. Such installations that generate important heating powers (3 500 kilowatts per ton in an hour) have an average ratio of thermic energy amounting 3 000 kilowatts hour per ton; 40 % of them are rejected with the water or with the air and 60 % of them are lost in the chimney-stalk or through radiance. The aim of the project is to put into operation two innovations which allow a reducing of 70 % of the powers and the consumptions of heat in a laundry by decentralization of the production of steam and by permanent reversal of the changes of states (i.e. the production of steam and the drying cycle) and by suppression of all air-rejections outside.
The decentralization of the production of steam is realized with independent or circuit supplied electric generators. The generators which are situated close to and beneath the producting machines are linked to them without important loss of charges which allows the condensates to return instantly through simple pipes to each generator without expansion (according to the "DIRECT G" system). It allows to save as much as 30 % (the reevapoation and the purifiers having been eliminated) to which must be added the saving of the network (10 %) and the chimney-stalks (15 %), say a total economy of 55 % regardless of the power and inertia savings according to the decentralization.
At an average temperature of 85 % (air and steam besides) the drying machines reject 15 to 20 % of the whole heat which is consumed in a traditional process. The "ECOSPIR"exchangers ensure the total conservation of this energy which is partly reused (as hot air) on the machines, most of it by condensation of the drying-steam which produces during washing sufficient quantities of 40 deg and 65 deg water from alimentary 10 deg water.
This allows to save 55 + 15 = 70 % of the energy; more over the reutilization brings an increase of 20 to 30 % of power and speed of produce.

Programm/Programme

ENG-ENDEMO C - Programme (EEC) of demonstration projects and industrial pilot projects (EEC) in the energy field, 1985-1989

Thema/Themen

3.4 - INDUSTRY

Aufforderung zur Vorschlagseinreichung

Data not available

Finanzierungsplan

DEM - Demonstration contracts

Koordinator

CENTRE HOSPITALIER DE MULHOUSE

EU-Beitrag

Keine Daten

Adresse

BP 1070
68051 Mulhouse Cedex
Frankreich

Gesamtkosten