wide exchange of personnel between the Tebodin offices. Services offered by Tebodin EC Consultancy, site selection Conceptual studies Project management Permitting Basic and detail engineering Tendering and procurement Construction supervision and Commissioning. These are offered as single engineering or consultancy packages or on an EPC-Contract (Engineering, Procurement, Construction) or even turnkey basis. The services and know-how offered by Tebodin EC cover the following technological areas: Process Technology Power Plants Logistics Environment Automotive Telecommunications Steel and machine building Logistics and Manufacturing Buildings and Infrastructure: Construction, Architecture, Building physics, Installations, Transport, Estimating/Bid documents One of the main activities of Tebodin EC is to provide the full range of services for new facilities for foreign investors in Hungary, specifically in the areas of industrial plants, commercial and logistics centres and infrastructural development. Your Project: The project covers a power plant in Gyöngyös in Hungary working with lignit (brown coal). The flue gas contains a high concentration of SO2 and the plant had to built a new desulphurization plant. The two absorbers (so-called washers) were built in the two cooling towers, where the flue gas is transported. The distance between the boiler houses and the cooling towers is ca. 300-400 m. Tebodin EC Ltd. had to design the entire system of flue gas ducts between the electro-filters and the washers in the cooling towers. Two washers where build and to each ones lead one flue gas duct (diameter 7400 mm.) In the entire project the 44 independent part of the duct are separated by compensators. The compensators are always above the supporting structures. The model shows a part of the flue gas ducts, directly before the washer. The system contains the duct and the supporting structure. There are two types of ducts in this model. The first type is supported by two structures (one is a theoretical support & one is the support given in the model). The other type is supported completely by the given structure. The first duct is located out of the cooling tower; and this part is loaded by wind. This duct also has a part where the cross section is smaller (D=5600 mm) than the others, because the duct has to pass between the columns of the cooling tower and the space is very narrow. The second part of the ducts are connected to the washers and the cross section is not circle but rectangle (11400x4600 mm). The ducts are insulated by 150 mm thick of mineral wool and coated by trapezoid steel plates. The ducts have fix points and the sliding supports are on the steel structures. The friction coefficient for sliding supports is 0,10 (applied for calculated supporting forces of the dead weight) The supporting steel structures are "latticed" structures with platforms and stairs to access the supports of the ducts. Technical data of the project Height: Centre line of the ducts between the legs of the cooling tower is on level 11.46 m, Centre line of the instep to the washer is on level 19.10 m Diameter: 7400 mm Thickness of the plates: 8 mm (7 mm design thickness + 1 mm for corrosion) Total weight for the whole project: ducts 2800 to, and the steel structure is 800 to Designing time: From February 1998 to August 1999. Material: S235JRG2 acc. DIN-EN 10025 (Yield strength:235 N/mm2, Allowable stress at working temp. (190 C°) is 163 N/mm2 Loads: Dead load of the structure by ESA-Prima Win Dead load of the corrosion's thickness and insulation and covering: 0.38 kN/m2 Dead load of grating of the platforms: 0.30 kN/m2 Live load on platforms: 3.50 kN/m2 Wind load: basic wind pressure is 1 kN/m2 (Shape factor according the rules of the owner) Pressure in the duct: +4.00 kN/m2 / -2.00 kN/m2 Temperature load: 190 C° inside, 175 C° outside of the stiffeners Friction coefficient: 0.10 Combination of loads according to DIN 18800 Stress & stability analysis acc. to DIN 18800 Part 1 for supporting steel structure. The buckling of the shells and plates of the ducts can be examined by hand according to DIN 18800 Part 3 and 4. In the model we can see the maximal stresses in the plates and shells of the ducts (never bigger than 163/1.1=148 N/mm2), the checking of stresses and buckling of the stiffeners and steel supporting structures, From the model we can estimate the expectable deformation of the duct in the connection point with the washer and could suggest the necessary over lifting of the duct. Use of ESA-Prima Win Experiences with ESA-Prima Win The results given by ESA-Prima Win are the same what we measured on the site in the reality. The deflections of the ducts were exactly the same what we had calculated with the program. It would be useful if the different part of the model could be got different colors. And also at rendering not the whole construction e.g. legs, beams, stairs, plates has the same color, but we can choose different ones. Modules used: Base module 3D shell Steel Code Check acc. DIN 41 SCIA User Contest Catalog
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