RU2388701C1 - 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 deaerator housing there arranged is a basket with a perforated end and inside which a displacer with a head piece in the form of spiral restricted on both sides with perforated sheets is arranged. In the basket volume there located is distributing chamber pierced with overflow pipes and interconnected by means of tube header to feed water inlet connection pipe.

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

1 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, 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 feed water and steam, the outlet of the vapor and deaerated water, a distribution chamber and a nozzle, and a basket with a perforated bottom is placed inside the housing of the deaerator, inside of which a displacer with a nozzle is placed in the form of a spiral bounded on both sides by perforated sheets, while in the volume of the basket there is a distribution chamber penetrated by bypass pipes and communicated using a pipe manifold with a feed water inlet pipe.

The essence of the invention is illustrated by the drawing, which shows a longitudinal section of a deaerator.

The deaerator contains a housing 0 with pipes: inlet 1 of feed water, inlet of 2 steam, outlet 3 of vapor, outlet 4 of deaerated water, a basket 5, inside which is placed, axisymmetrically to the deaerator, displacer 6 with a nozzle 7 in the form of a mesh, with their bases entering the holes through the height of the displacer 6 and twisted to the last one, and the displacer 6 with the nozzle 7 is limited on both sides by sheets 8 and 9 perforated on the area of the nozzle 7. All this limited volume is installed between the perforated bottom 10 of the basket 5 and the perforated sheet 11, they function bubbling device. In addition, in the volume of the basket 5 there is a distribution chamber 12, penetrated by bypass pipes 13 with holes, the inner cavity of which is communicated by means of a pipe 14 in the form of a cochlea with a nozzle of the inlet 1 of the feed water. Uniform distribution of steam is carried out using the pipeline 15 with an inkjet device fixed in it in the form of an inverse conical funnel.

Deaerator works as follows.

Feed water is supplied to the inlet pipe 1 and through the cavity of the pipeline 14 enters the cavity of the distribution chamber 12, where the water is heated to a temperature close to the saturation temperature, and from where it flows through the openings into the cavity of the bypass pipes 13, to perforate the sheet 11, which serves as a bubbler device , the volume of the mesh nozzle 7 mounted on the displacer 6 passes, which allows to increase the contact volume of steam with water due to the displacement of the oncoming flows to the periphery of the basket 5, the effectiveness of this structural ment was confirmed by experiment bounded by two perforated plates 8 and 9, wherein due to the crushing into small droplets, bubbling, and contact heat exchange is carried deep removal of corrosive gases, perforated bottom 10 of the basket 5 from exiting through outlet nozzle 4 of deaerated water deaerator. Dry saturated steam is supplied through the inlet pipe 2 and is evenly distributed through the jet device in the form of a reciprocal conical funnel located in the upper part of the pipeline 15 to perforate the bottom 10 of the basket 5, the volume of the mesh nozzle 7, the perforated sheet 11, the cavity of the bypass pipes 13 exit through the pipe output 3 vapor with corrosive gases. In the gap between the housing 0 and the basket 5 there is a certain flow of steam with the exit between the welds, which contributes to the heating of the basket 5 from the outside. The execution of the pipeline in the form of a snail allows you to compensate for the temperature movements of the pipeline 14 relative to the distribution chamber 12.

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 feed water and steam, the outlet of vapor and deaerated water, a distribution chamber and a nozzle, characterized in that a basket with a perforated bottom is placed inside the body of the deaerator, inside of which a displacer with a nozzle in the form of a spiral is placed, bounded on both sides by perforated sheets, while in the volume of the basket there is a distribution chamber penetrated by bypass pipes and communicated by means of a pipe manifold with feed water inlet tube.

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