UTILIZATION OF INDUSTRIAL WASTE AND ESPECIALLY PETROCHEMICAL RESIDUES FOR POWER GENERATION WITH LOW EMISSIONS

Ziel

The purpose of the project is to demonstrate a low-emission combustion unit to burn petrochemical wastes, such as distillation bottoms, light boiling petrol residues, heavy oil fractions, acid tars and PCB-containing waste oil.
The plant started full operation on September 1988. The burner capacity was varied between 120-450 kg oil/h while for all tests the combustion air supplied was 125. The operating temperature of the furnace was in the range of 1150-1250 deg. C and this was controlled by recycling of flue gases. The flue gases purification system was modified considerably and it was concluded that hot gas desulphurization was not needed while for HCl removal a combination of limestone and steam injection in the dechlorination reactor proved efficient and resolved all operational problems of solids, (CaCl2) accumulation. No problem was encountered with the bag filter.

Emission measurements for dust, CO, SO2, HCl and total carbon are performed continuously while emission measurements for inorganic halogen compounds (HF, phosgen), BTEX-aromatics, chlorinated hydrocarbons, PCB and PCDD are performed periodically. The table below summarizes some of the results obtained. It was also formal that no significant amounts of phosgene BTEX-aromatics, chlorinated hydrocarbons and polychlorinated Biphenyles are emitted by the installation and these were always well below the limits set by TA Luft. However the emissions of dioxines and furnaces were always close to the limits specified by TA Luft and although the limits were rarely exceeded the contractor plans to continue development work in this area.

Nevertheless, it can be concluded that from the emissions point of view, the furnace chamber system with swirl has proved to burn waste oils successfully. During the demonstration period which ended on 31.12.1989 the demonstration plant fulfilled almost 80% of the the planned capacity of waste oils combustion and about 50% of the targeted energy savings. The reduced capacity was due to technical optimation at the flue gas purification system while the reduced energy savings were due to the utilization of an existing old type radiation boiler instead of a convection boiler.
The concept is based on a proprietary combustion system combined with a two step, dry flue gas treatment system and an existing boiler. The combustor is composed of a high swirl, substoichiometric combustion chamber, followed by an aftercombustion chamber, to which secondary air is added ensuring a residence time of 0.3 s. and 1200 deg. C. The particular geometry, together with the flow pattern lead to a complete combustion, with low formation levels of NOx, CO and dioxins.
The flue gas is desulphurized by injection of crushed limestone, together with recirculated flue gas to reduce the temperature to a level of 1100 - 1150 deg. C. After heat recovery, lime powder and steam are added for HCI removal. Finally, the flue gas is cleaned using bag filters.

Programm/Programme

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

Thema/Themen

1.3 - HEAT AND ENERGY FROM DIRECT COMBUSTION

Aufforderung zur Vorschlagseinreichung

Data not available

Finanzierungsplan

DEM - Demonstration contracts

Koordinator

MINERALOEL-RAFFINERIE DOLLBERGEN GMBH

EU-Beitrag

Keine Daten

Adresse

3162 Ijetze-Dollebergen
Deutschland

Gesamtkosten