STEAM PRODUCTION BY A HEAT TRANSFORMER

Información del proyecto

Identificador del acuerdo de subvención: EE.-00543-84

Proyecto cerrado

Fecha de inicio 14 Noviembre 1984

Fecha de finalización 31 Diciembre 1992

Financiado con arreglo a

• Programme (EEC) of demonstration projects relating to the exploitation of alternative energy sources and to energy saving and the substitution of hydrocarbons, 1983-1985

Coste total

€ 1 956 910,00

Aportación de la UE

€ 782 764,00

Coordinado por

GEA LUFTKUEHLER GMBH
Germany

Objetivo

To install a heat transformer for the recovery of waste heat contained in wet steam (70 - 120 deg. C.) which is at present not used, to produce steam at 130 - 150 deg. C. The project is expected to confirm, if not improve upon, results already obtained with an existing pilot installation. Operating 8,000 hrs/yr a steam production of 31,600 tons/yr at 2.5 bar corresponding to 2046 TEP/yr is expected. Payback is estimated at 4.2 yrs.
The planning, mechanical design, and the erection was finished in June 1988. There were problems from the very beginning of the first test series under design conditions with 100 deg. C waste steam. From the recorded data, small leakages could be detected at high temperature, but no leakage could be detected on the cooled down heat transformer. Due to these leakages, pitting corrosion occurred in the absorber tubes. This generated some small holes in some of the stainless steel tubes.
During the demonstration phase of the project several performance tests were executed. Due to varying steam production of the dryer and varying composition (air content) of the exhaust steam, the efficiency of the heat transformer (that is the recovered heat in the form of produced steam of 130-150 deg. C) varies too. The cop was found to be between 0.33 to 0.4.
Typical values are
Exhaust Steam Produced Steam Steam Pressure Cop
t/hr t/hr bar
6,45 2,1 3,4 0,33
7,4 2,8 3,0 0.38
5,0 2,03 3,0 0,4
The heat transformer is fed by process waste heat at a temperature of about 100 deg. C. A part of this energy is transformed to a higher temperature heat (ca 130 deg. C.) and constitutes that fraction which can be recovered, the remainder being exhausted at a lower temperature of about 40 deg. C. The working fluid is a solution of water mixed lithium bromide (LiBr). In comparison with ammonia (NH3), this solution allows operation either under vacuum or slight over pressure in the transformer's internal circuits thus avoiding the high pressures (up to 40 bar) seen when NH3 is used. LiBr leaks are almost completely avoided. The heat transformer will be installed in a chemical firm (Degussa works, in Wesseling, Cologne) where the steam coming from a dehydration unit will be used as the heat source. The transformer will extract 4.7 Mw from the heat potential available in this steam. Of this 4.7 Mw, 2.3 Mw will substitute 3.52 ton/hr of steam at 3 bar of the boiler production. The remainder, 2.4 Mw will serve to heat 110 m3/hr of water from 15 to 34 deg. C. The efficiency of the transformer, defined as the ratio of the energy transformed to the highest temperature (2.3 Mw) and the waste energy supplied at lower temperature (4.7 Mw), is 48%.

Ámbito científico (EuroSciVoc)

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Programa(s)

• ENG-ENALT 2C - Programme (EEC) of demonstration projects relating to the exploitation of alternative energy sources and to energy saving and the substitution of hydrocarbons, 1983-1985

Tema(s)

• 3.2 - INDUSTRY

Convocatoria de propuestas

Datos no disponibles

Régimen de financiación

DEM - Demonstration contracts

Coordinador

GEA LUFTKUEHLER GMBH

• Aportación de la UE: Sin datos
• Dirección: DORSTENERSTRASSE 484 ; 4630 Bochum ; Alemania
• Coste total: Sin datos