(19)
(11) EP 0 056 710 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
28.03.1984 Bulletin 1984/13

(43) Date of publication A2:
28.07.1982 Bulletin 1982/30

(21) Application number: 82300189

(22) Date of filing: 14.01.1982
(84) Designated Contracting States:
DE FR

(30) Priority: 15.01.1981 GB 8101191

(71) Applicant: ASEA Limited
 ()

(72) Inventor:
  • Reeve, Brian Robert
     ()

   


(54) Recovery of energy from waste gas streams


(57) 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).







Search report