ES347110A1 - Multicircuit recirculation system for vapor generating power plant - Google Patents

Abstract

In a forced through-flow steam generator having a furnace with highly heated water tube section L in series with a less highly heated tube section U, a front recirculation circuit 59, 63 recirculates some of the fluid leaving the section U back to the inlet pipe 70 of the section L and a second recirculation circuit 64 recirculates some of the fluid leaving the section L to the inlet pipe 70. The recirculation circuits include a common recirculating pump 68. Feed water enters at 61 and mixes in chamber 60 with the recirculated fluid in circuit 59, the fluid flowing to chamber 62 where it further mixes with the recirculated fluid in circuit 64. The tubes 15 in section L lead to a header 16 connected by a pipe 20 to a bottom header 18 for the tubes 22 in the section U. The headers 24 ... 28 for the tubes 22 are convected through further tubes 31, 36, 39 and 48 to further headers 35, 50, 52, connected to a common header 32 from which the through flow fluid flows to superheaters whilst the recirculated fluid flows through pipe 59.