Continuous steam generator with equalizing chamber

摘要

An evaporator 10 for evaporating a liquid includes a plurality of harps 20 disposed within a duct or chamber such that a heated fluid flow 22 (e.g., heated gas or flue gas) passes through each successive row of harps 20 of the evaporator 10. Each of the harps 20 includes a lower header 24, a plurality of lower tubes 26, an intermediate equalizing chamber 28, a plurality of upper tubes 30, and an upper header 32. The lower tubes 30 are in fluid communication with the lower header 24 and extend upward vertically from the lower header. The upper ends of the lower tubes 26 are in fluid communication with the equalizing chamber 28. The upper tubes 30 are in fluid communication with the equalizing chamber 28 and extend upward vertically from the equalizing chamber. The upper ends of the upper tubes 30 are in fluid communication with the upper header 32.

主权项

1. An evaporator for evaporating a liquid in a heat recovery steam generator, the evaporator comprising:
a duct having a heated fluid flow passing therethrough in a flow direction, and a harp having a portion disposed transversely in the duct, the harp including:
a lower header with a liquid input pipe;plurality of lower tubes, each having an upper end and a lower end, the lower ends of the lower tubes being fluidly connected to the lower header;an intermediate chamber fluidly connected to the upper ends of the lower tubes,plurality of upper tubes having an upper end and a lower end, the lower ends of the upper tubes being fluidly connected to the intermediate chamber; andan upper header fluidly connected to the upper ends of the upper tubes;wherein the plurality of upper tubes, the plurality of lower tubes and the intermediate chamber are disposed in the duct transversely to the flow direction of the heated fluid flow, and wherein the flow direction of the heated fluid below the intermediate chamber is in the same direction as the flow direction of the heated fluid above the intermediate chamber; andwherein the plurality of upper tubes and the respective plurality of lower tubes are vertically offset for promoting mixing of the fluid and steam in the intermediate chamber before passing through the plurality of upper tubes.