| 摘要 |
Process heat is recovered from a furnace 10 and a product gas line by means of heat exchangers 9 and 21 respectively. These heat exchangers are in a circuit 7 in which sodium, which is liquid at low pressures and high temperatures, is circulated. In heating the sodium, process heat is recovered from the hot gas stream from the furnace 10 and from the product gas and is supplied to heaters 6 and 22 for heating the feed gas fed to a coal gasification, gas cracking or hydrocracking plant 2. For this purpose, the process air preheater 6, which heats charge gases, and the heater 22 which forms a process stream generator are traversed by the heated sodium, in order to achieve both a preheating of the process air and of the charge gases and also a superheating of the process steam up to high temperatures, without the heat necessary for this purpose having to be obtained from the combustion of a portion of the product gas. <IMAGE> |
