RU2388700C1 - Deaerator - Google Patents

Abstract

FIELD: heating.

SUBSTANCE: invention refers to heat engineering and is intended for being used during make-up water heating and corrosion-aggressive gases removal from it in water treatment system of nuclear power station. Deaerator includes housing with feed water and steam inlet connection pipes, vented steam and deaerated water outlet connection pipes, inside which there arranged is water and steam-distributing headers, bubble device and a head piece. The latter is made in the form of spiral grids vertically installed in cylindrical shells having perforated ends and fixed between two additional sheets with perforation in location areas of ends. Water-distributing tube header is made in the form of a volute with holes made in its lower part, and steam-distributing tube header is made in the form of a volute with holes made in its upper part.

EFFECT: increasing efficiency of gas removal from make-up water at operation with increased pressures.

2 dwg

Description

The invention relates to a heat exchange technique and is intended for use as a deaeration device for heating make-up water and removing corrosive gases from it in a water treatment system of a nuclear power plant (NPP) operating on a liquid metal coolant in the mode of variable loads.

Known bubbling deaerator containing a tank and a deaeration column with a bubbler and a vapor transfer pipe buried in the pan, and the pipe is equipped with an annular collecting chamber with a drainage channel, the lower edge of which is placed below the water level in the tank, and the collection chamber with a drainage channel is connected to the pipe, at a distance determined from a mathematical expression from its lower edge / Kurnyk L.N. et al. Bubbling deaerator. SU a.s. No. 1198010. C02F 1/20. Priority - 08/12/83. Publ. Bulletin of inventions No. 46. 12/15/1985 - analogue.

The disadvantage of this technical solution is the low operational values of deaeration during operation of the latter at elevated pressures, since with increasing pressure in the deaeration column, the amount of oxygen passing into the water from the gaseous to dissolved state increases, thereby creating the possibility of the deaerated tank entering the dewatering channel water with a high oxygen content.

A thermal deaerator is known that contains a jet and bubbler plate placed in a column, and below it a horizontal steam perforated manifold in communication with a vertical bypass pipe integrated in the bubbler plate, the steam collector having a nozzle placed with an outlet end face with a gap relative to the lower edge of the pipe and coaxially the latter, and the diameter of the nozzle is less than the diameter of the pipe / Vikhansky G.M. et al. Thermal deaerator. SU a.s. No. 1183778. C02F 1/20. Priority - 01/27/84. Publ. Bulletin of inventions No. 37. 10/07/1985 - prototype.

The disadvantage of this technical solution is the ineffective deaeration process when operating at elevated pressures, due to the fact that a fairly complete removal of carbon dioxide and oxygen from water by treating deaerated water jets with steam does not occur due to the low-intensity heat exchange process. In addition, there is no uniform distribution of fluid over the nozzle, which leads, for example, in the absence / presence / vapor space above the nozzle, to reduce the effect of deaeration.

The technical result of the invention is the provision of operational reliability of the effective operation of the deaerator at elevated pressures.

The specified technical result is achieved in that the deaerator, mainly of high pressure, contains a housing with nozzles for the inlet of makeup water and steam, the outlet of the vapor and deaerated water, inside of which there are water distribution and steam distribution manifolds, a bubbler device and a nozzle, the nozzle made in the form of a spiral nets vertically mounted in cylindrical shells having perforated bottoms and secured between two additionally installed perforated sheets walkie zones bottoms arrangement, water distribution manifold tube is in the form of a snail with holes in its lower part, a steam distribution manifold tube is in the form of a snail with holes in its upper part. The essence of the invention is illustrated by drawings, where

figure 1 is a longitudinal section of a deaerator;

figure 2 is a transverse section aa of figure 1.

The deaerator contains a housing 0 with pipes: inlet 1 of make-up water, inlet of 2 steam, outlet 3 of vapor, outlet 4 of deaerated water, a water distribution manifold 5 having the form of a pipeline in the form of a snail with perforation in its lower part, an inkjet and bubbler device 6, combined with respect to each other in such a way that their relative position forms a hydraulic shutter, a steam distribution manifold 7 having the shape of a pipeline in the form of a snail with perforation in the upper part, moreover, perforation of the water distribution 5 and steam limiter of 7 collectors is located equidistant from each other, a set of 8 shells in the form of modules fixed inside the body 0 of the deaerator with two additional sheets 9, each module of set 8 consists of a cylindrical shell 10, inside of which there is a nozzle 11, made in the form of a twisted in a spiral mesh placed vertically in a cylindrical shell 10 and bounded on both sides by perforated bottoms 12, which are welded to the cylindrical shell 10 with a recess inward on standing 10-20 mm, the additional sheets have perforations 9 in the bottoms locations 12 of cylindrical shells 10.

Deaerator works as follows.

Make-up water is supplied to the inlet pipe 1 and distributed through the perforation located in the lower part of the water distribution manifold 5 uniformly over the area of the additional sheet 9, the perforation of which is made in accordance with the passage section of each module of the set of 8 shells, then to the perforated bottoms 12 that align the flow along the area of the nozzle 11 and perform the function of bubble sheets. In the nozzle 11, the make-up water is heated to the saturation temperature and, passing through the second bottoms 12 and the perforation of the additional sheet 9, enters the bubbler and inkjet devices 6, combined relative to each other so that their relative position forms a hydraulic shutter that contributes to a deep and final removal of corrosive gases from make-up water. Further, the deaerated water exits through the outlet pipe 4 of the deaerator. Dry saturated steam is supplied through the inlet pipe 2 and distributed through the perforation located in the upper part of the steam distribution manifold 7 uniformly over the area of the jet and bubbler devices 6, then it is evenly distributed over the area of the additional sheet 9 with passage through the bottoms 12 and the nozzle 11, again through the bottoms 12 and additional sheet 9 with an exit through the outlet pipe 3 of the vapor with corrosive gases.

Application of the design of the deaerator of the proposed type will allow for the deep removal of corrosive gases from the make-up water due to a significant increase in the contact of water and steam and its heating, water turbulization, and, as a result, reliable production of feed water with an acceptable limit of gas concentration in it.

Claims (1)

A deaerator, mainly of high pressure, containing a housing with nozzles for the inlet of makeup water and steam, the outlet of vapor and deaerated water, inside of which there are water distribution and steam distribution manifolds, a bubbler device and a nozzle, characterized in that the nozzle is made in the form of spiral-wound grids vertically mounted in cylindrical shells having perforated bottoms and secured between two additionally installed sheets with perforation in the areas of the bottoms, the water distribution pipe collector is made in the form of a snail with holes in its lower part, and the steam distribution pipe collector is made in the form of a snail with holes in its upper part.

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