In 2019 – 2021 our company has completed design works on the aspiration system of the blast-furnace shop of PJSC “Ilyich Iron and Steel Works Mariupol”. During such a short period of time, dedusting plants of BF No.3, BF No.5 cast houses, dedusting plants of BF No.3, BF No.5 stockhouses were designed, built and put into operation. At the moment construction of a dedusting plant for BF No.4 cast house and for BF No.4 stockhouse is in progress.
The main task by implementation of this project was localization of dust and gas emissions from the dusty units of the old cast house, where for shelters for the main and transport runners are not provided for, and multispout HM pouring was realized.
Experts of our company have developed a model and performed CFD calculations of the entrapment efficiency of emissions from the taphole and main runner using an under-roof exhaust hood (Fig. 1).
Fig. 1 Streamlines of captured particles of flue gases from the HM taphole.
After completing calculations, a 3D model of the designed a dedusting system and support structures has been developed (Fig. 2), which in its turn significantly reduced the time for development of working documentation.
Fig. 2. 3D model of the dedusting system of BF No. 3 cast house.
When calculating the time for construction and installation works and comparing it with the BF No. 3 shut-down period it was decided to change the exhaust hoods configuration over the tapholes to reduce the time of construction and installation works during the BF shut-down. We proposed to install an under-roof exhaust hood over the cast house tapholes (Fig. 3).
Fig. 3. Exhaust hood over the tapholes of BF No. 3 cast house.
For localization of dust and gas emissions from the HM spouts, exhaust hoods are provided at the discharge points (Fig. 4), however, the efficiency of these hoods is much lower in comparison with installation of sheltered tilting runners (Fig. 5).
Fig. 4 Dedusting hoods above the HM pouring spouts.
Fig. 5. Dedusting shelters of the tilting runners.
Aspiration air from the cast house is directed through the ducts to the cast house dedusting plant for cleaning. At this facility, technical solutions are provided for construction of a BF cast house dedusting plant using a bag filter with impulse regeneration, which is compliant with the state of the art technical level in the field of dedusting.
Fig. 6 Dedusting plant of BF No.3 cast house.
Fig. 7. BF No.3 stockhouse dedusting plant.
Fig. 8. BF No.5 cast house dedusting plant.
Fig. 9. BF NO.5 stockhouse dedusting plant.
In order to minimize collisions when connecting the designed structures with the existing ones, we carry out a 3D model of the entire designed complex and combine it with the point cloud of the existing site.
Fig. 10. 3D model of the dedusting systems of BF No.4 cast house and stockhouse.
Fig. 11. 3D scanning of existing structures of the blast furnace shop.