Description: Das Projekt "Gegendrucksteuerung von Hochoefen durch Einsatz einer Kopfggas-Druckentlastungsturbine" wird vom Umweltbundesamt gefördert und von Thyssen Stahl durchgeführt. Objective: To install and test a top gas pressure relief turbine to use the pressure drop in the blast furnace after waste gas cleaning to generate electrical power (13,480 kW) to achieve annual energy saving of 7,760 TOE at project level. Assuming average power plant efficiency, this should correspond to primary energy saving of +- 27,000 TOE/y. General Information: Top-gas pressure allows appreciably higher specific outputs for a given furnace volume. Longer gas residence time in the blast furnace leads top gas flow homogenisation and reduced coke consumption. While a low fraction of gas pressure (0.25 Bar max.) is required for the downstream gas cleaning system, residual pressure 2 Bar max. is lost through throttling, equivalent to +- 30 per cent of energy used for blast compression. In order to utilize the pressure drop in the top gas after waste gas cleaning it was decided to install a pressure recovery turbine which is located downstream of the scrubbers in the already existing gas purification facilities at Schwelgern. It was decided to install a double-flow, four stage axial type reaction turbine designed to generate 13.5 MWh from a gas throughput of 587,000 m3/h, admission temperature of 45 deg C and a differential pressure of 1.8 Bar. The cast steel turbine casing is 3,870 mm in length, 3,500 mm maximum height. The rotor is 6,055 mm long, of1,692 mm maximum diameter and weighs 75 Tons. The admission guide blades of the first stage are variable to attain a regular top-gas pressure. In addition, they ensure identical efficiency over a broad operating range. Coupled to the turbine is a 14 MWh self-excited asynchronous generator of 1,500 rpm output speed. When switching to the power network, the self-excitation mode precludes any voltage drop. By connecting capacitors to the generator terminals, cover for the no-load reactive power is guaranteed. Gas pressure within the network is 0.2 Bar. All operational sequences are predetermined, executed and monitored by a control and regulating system. Turbine start-up and shut-down is automatic with no appreciable effect on top gas pressure. Licences can be obtained from Zimmermann and Jansen. Achievements: To perform the test programme, 60 measuring points were logged. An electronic digital measuring point logging system was also put into operation in parallel with the conventional analogue one. Most of these measuring points were equipped with a buffer amplifier to prevent signal interference. The turbine output depends primarily on pressure drop, inlet temperature and mass flux i.e. on factors influenced by the operational mode of up and down stream facilities. In order to take account of these variables, the following influencing parameters were examined: - increasing inlet pressure; - reducing outlet pressure; - increasing gas inlet temperature; - reducing scrubber water temperature; - gas flow rate; - top gas composition. A total of three main trials and preliminary tests were conducted ...
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Wiederverwendung ? Gasnetz ? Elektrische Leistung ? Holzeinschlag ? Interferometrie ? Koks ? Wassertemperatur ? Main ? Primärenergieeinsparung ? Stromerzeugung ? Gasturbine ? Gewährleistung ? Hochofen ? Hochofenwerk ? Elektrischer Kondensator ? Gasförmiger Stoff ? Reaktionstemperatur ? Konsum ? Rechtsschutz ? Energie ? Energieeinsparung ? Wirkungsgrad ? Kraftwerk ? Stahl ? Fließgeschwindigkeit ? Abgasreinigung ? Kapselung ? Geländerelief ? Gaswäscher ? Ofen ? Regeneration ? Rotor ? Rückstand ? Sprengung ? Anlagenbetrieb ? Gasreinigung ? Physikalische Größe ? Kessel ? Verdichter ? Turbomaschine ?
Region: Nordrhein-Westfalen
Bounding box: 6.76339° .. 6.76339° x 51.21895° .. 51.21895°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 1981-05-03 - 1984-10-10
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