RECOVERY OF CONVERTER GAS IN THE PRODUCTION OF STEEL ACCORDING TO THE KMS PROCESS

Ziel

In converter steel plants operating in accordance with the KMS process (Kloeckner-Maximilianshuette-Stahl), the production of steel from hot metal and scrap results in waste gases with high CO contents, which have been flared through stacks to date. Three converter plants of the Maximilianshuette are to be equiped with a controlled gas suction and gas recovery system to permit the application of the usable converter gas for the production of process heat and steam by way of intermediate storage. It is to be expected that the annual energy saving at project level will be 6.500 TOE for the production of raw steel, as proposed in this project.
The 3 gas analysis systems were commissioned on march 3RD 1985. After this, measurements were carried out on the 3 converter plants during the month of july 1985. A description of the gas analysis system follows; the converter gas is taken via 2 gas sample probes which are converter off-gas cleaner. The connection to the probes is made alternately and is controlled by a program which considers the state of cleanliness of the filtered. The gas flows through a heated tube to the sample gas cooler where the condensate is seperated and the dry gas is cleaned and fine filters. The gas is then distributed to the various gas analysers. The analysis system has been shown to have an accuracy of greater than 1.5%.
Measurement results; the first series of measurements showed that although the volume of gas/ton of crude steel was higher than expected,its calorific value was less resulting in 13% less recoverable energy than was estimated in the planning.
At this rate, 906,000 tons of crudesteel production per annum would produce 238,700 gj/yr of converter gas energy.
Previous operational observations seem to suggest that a higher gas recovery may be possible if the process of gas collection can be further optimised.
The project is part of an extensive programme for the conservation of energy in the Sulzbach-Rosenberg works. The Maximilianshuette operates a KMS-steelworks there equipped with three converters, each having a capacity of 60 t. The converters are equipped with cleaning systems based on a wet cleaning process.
These operate with the assistance of two Venturi stages.
A controlled gas collection system is used for suction at the mouth of the converter to prevent combustion of the waste gases containing CO above the mouth. The most important components of this gas suction system, e.g. A controlled skirt which can be moved upwards and downwards, were installed during the construction of the steelworks.
Within the scope of this project, the actual gas recovery and gas storage facility is to be developed, erected and tested. Gas recovery requires switch-over stations as well as diverse closed-loop control and control systems, which permit switch-over to gas recovery during the blowing process depending on the CO content of the converter gas (switch-over point at a CO content of about 40%). Pneumatic drives are provided for all switch-over elements. The gas will probably be stored in a low pressure telescopic gasometer equipped with a special shell sealing. Gas storage serves to equalize the irregular gas production. In the first phase of the project, a measuring programme will be implemented following the installation of diverse measuring instruments. Its purpose is to determine the data on the temporal decrease in the amount of gas, the composition of the converter gas and the gas curves occurring behind the cleaning facility in the course of one heat. Such data are required to dimension and design the necessary facilities. These results will be used to determine the process course for the recovery of gas and to design and plan the facilities. Following the erection, the overall facility will be tested in the course of an 8 month demonstration period and final evaluation will be effected.

Programm/Programme

ENG-ENALT 1C - Programme (EEC) of financial support for projects to exploit alternative energy sources, 1979-1984

Thema/Themen

1.6 - INDUSTRY

Aufforderung zur Vorschlagseinreichung

Data not available

Finanzierungsplan

DEM - Demonstration contracts

Koordinator

EISENWERK-GESELLSCHAFT MAXIMILANSHUETTE MBH

EU-Beitrag

Keine Daten

Adresse

DE - 8458 SULZBACH-ROSENBERG

Deutschland

Gesamtkosten