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Contenido archivado el 2022-12-27

TWO STAGE GAS GENERATOR FOR INDUSTRIAL WASTES

Objetivo

Thermic utilization of industrial residual system resp. production residues in a two stage incineration system under production conditions. The tests contain as well pre-trials for determination of the optimal system parameter as also permanent trial runs, for establishing of material and energy balances and for judgement of the operation reaction through a longer time period. By the work with this process the advantages shall be shown :
- Profitability also with small residual material amount of 200-1000 kg/h
- complete energetic utilization of the material
- easy integrating in available heating systems, for example preswitching of an available boiler system
- universal usability of energy
- utilization of the product residues in the own factory for heating, process heat and evtl. electric current generation
- reduction of the removal costs.
Made trials with various materials and good results in respect to the burning out and the grades of efficiency had been performed.
The throughout of the plant is depending on the piled weight and the heating value of the materials and is maximal 200 kg/h. The measured energy at the heat exchanger with the run trials comes out between 550 kW and 700 kW, with waste gas temperatures of 250 deg. C up to 280 deg. C. The stated heat utilization degrees had been between 0,76 and 0,78. The emissions move below the limit values of the technical guidelines TA Luft. It is planned to run trials with further production residuals and to test the process. Further application materials resp. still materials to be tested in detail are for example PU-hard and soft foam, RIM-parts of old automobiles, halogen free plastics, coat coagulates, predried sewerage sludge, not biologically degraded biomasses and liquidity wastes.
In the frame work of these trials, rebuilding measures are planned, concerning:
- Alteration of the fluidized gas injection into the reactor, in order to obtain a better sand circulation
- addition of an equipment in order to be able to carry out inorganic solid materials (metal parts) of the fluidized bed during the operation
- optimizing of the actual feeding worm, which is applicable only for compressed materials, that also with hard not deformed materials a better gas density is guaranteed.
- construction of a feeding lance, in order to be able to inject into the reactor liquidities and pasty materials.
Based on the acquired knowledge plants can be constructed at any time according to this conception also of bigger scales. According to the application material in the area of the fedding system, the heat exchanger part and eventually the emission reducing (for example reduction of NOX) are to make optimizing.
The demonstration system, built in the smallest production scale, had been erected in the technical science department of the Company EISENMANN.
The process principle is based on a mechanical pretreatment, with which the material will be communited with a slitting rollers appliance and afterwards will be transported into a storage silo. From the silo the filling system continuously pushes in the waste material in the fluidized bed reactor, which has a quadratic free cross section of 500 x 500 mm and is provided with a 400 mm thick fireproof lining. A 1 m high piling up of quartz sand with a grain size of 0,4 - 1,6 mm serves as heat bearer medium. The piling up will be fluidized by the injection of hot flue gases.
The advantages of a fluidized bed as pyrolytic stages are the following :
- The fluidizing of the sand causes a uniform distribution of temperature
- an intensive heat transition between sand and residual material is given
- by the fluidizing a mechanical comminution of the material simultaneously takes place, with that the lump forming of the used material will be avoided
- by a low oxygen, preheated fluidized gas a pyrolisation with understoichiometric incineration takes place so, that a max. reaction temperature of approx. 600 deg. C up to 700 deg. C arises, with which still no slag forming appears.
The following thermic processes proceed :
The hot flue gases (approx. 650 deg. C) contain 6-8% oxygen. They hold the sand bed on approx. 550 deg. C. The supplied residual material combustes in these conditions understoichiometric.
Through a short insulated connection line the pyrolitic gases reach in a vertical arranged combustion chamber. Here they will be burned with the help of a support burner by injection of fresh air with approx. 1100 deg. C.
Following the combustion chamber the flue gases will be diverted horizontally, before they give away again in a vertical heat exchanger their energy to a hot water circulation.
After the heat exchanger the flue gases are still approx. 250 deg. C hot. With this temperature they flow through a special designed hot gas dust filter, before they will be diverted via a chimney.
After the filter a part of the flue gases will be drawn off and used for fluidizing of the sand film.
The waste gases will be monitored continuously on CO-, CO2-, O2-, NOX-
and SO2 emission by a suitable measure systems.

Convocatoria de propuestas

Data not available

Régimen de financiación

DEM - Demonstration contracts

Coordinador

Eisenmann Maschinenbau KG
Aportación de la UE
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Dirección
Daimlerstraße 5
71085 Holzgerlingen
Alemania

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Coste total
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