| 摘要 |
<p>In an iron- or steel-making plant comprising a metallurgical processing vessel (1) from which, in operation of the plant, there issues a stream of waste gas at superatmospheric pressure and elevated temperature, there is provided means for recovering energy from the waste gas stream. This energy recovering means comprises means (6, 12) for supplying the gas stream to the inlet of a gas expander (16) which includes a rotor (18) drivable by the gas stream and comprising an output drive shaft (22), an alternating current generator (28) arranged to be driven by the shaft (22), and a voltage and frequency converter (32) having its input side connected to the electrical output of the generator (28) and its output side connected to an electrical power network (5). The converter (32) is of the kind which, over a predetermined range of the speed of rotation of the generator (28), delivers at its output side electric power at a voltage and frequency which at all times conform to the voltage and frequency of the network (5).</p> |
