METHOD AND APPARATUS FOR ORGANIZING THE FLOW OF FLUID IN A VERTICAL STEAM GENERATOR

摘要

Apparatus and method for preventing formation of stagnate volumes and sludge deposition sites (40) in lower central regions of steam generating fluid contained in vertical-tube heat exchangers of steam generators. Fluid in the generator is injected into the heat exchanger by diametrically-opposed flow vanes (20) directing fluid in opposite directions (30) near the central region of a tube sheet (2) at the lower end of the heat exchanger. The fluid is injected adjacent and parallel (30) to the tube sheet surface to induce initial rotational flow (32) in the fluid, thus introducing horizontal, outwardly directed radial flow components into the vertically flowing fluid in the generator. The flow vanes (20) induce a system of vertical, radial and rotational flow components into the fluid; which system causes the fluid to separate portions of dissolved or suspended sludge. Such precipitated sludge is directed to collection sites (42) near the periphery of the tube sheet where it is expelled from the generator.