SU1321688A1 - Method of thermal deaeration of water and vacuum deaerator for effecting same - Google Patents

Abstract

The invention relates to heat power engineering and industrial heat engineering, and may be. used in thermal power plants and in makeup schemes / U heat networks. The invention allows to intensify heat exchange processes during vacuum deaeration. Overheated water is supplied to the de-aerator through the distributing collectors and through individual inlet pipes is supplied to the trapezoidal evaporation chambers 4. Through the side inclined walls of the chambers 4 perforated from the channels formed by them, the vapor-liquid mixture in the form of opposite inclined high-speed jets is introduced through the depth of the fluid in the bed moving through the bubble plate 3. This leads to the mutual vortex penetration of the phases, the formation of a vapor-liquid emulsion with a well-developed surface of contact of the phases and a high rate of its renewal. 2 sec. f-ly, 2 ill. (LA

Description

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The invention relates to heat power engineering and industrial heat engineering, in particular, to methods and devices for thermal deaeration of water, and can be used in CHP plants and in circuits for heating networks.

The aim of the invention is to intensify heat exchange processes during vacuum degassing.

Fig. 1 shows a vacuum deaerator, which explains the proposed method, a cross section; figure 2 is the same longitudinal section.

The deaerator contains water distributors of hens G and 2, a bubbling device 3 consisting of a system of trapezoidal evaporation chambers 4, the side walls of which are perforated. Each of the chambers 4 is provided with an individual heat carrier inlet. The nozzles 5 are connected to a distribution manifold 6.

The deaerated stream is introduced and discharged through the pipes 7 and 8, and the vapor-gas mixture is sucked through the pipe 9.

The deaerator works as follows.

The water to be deaerated is fed successively to the water distribution plates 1 and 2 through the nozzle 7, from where, in a cascade of jets, a section of the bubbling device 3 is drained to the beginnings of the PCB, having some degree of unheating to the saturation temperature. At the initial part of the bubbling device 3, due to the effective intraphase vortex heat transfer, when a high-energy counter-flow of the two-phase coolant enters the zone, the deaerated liquid is intensely heated to a temperature close to the saturation temperature. The deaeration process is carried out on the main portion of the bubbling device 3 in a layer of mobile foam with a highly developed and actively renewed interfacial surface created in the zone of opposing high-speed jets of a two-phase heat carrier. On the bubbling discharge, a device where the turbulizing effect of the vapor-liquid jets stops, the foam collapses and the vapor-gas and liquid phases separate. The de-aerated water is discharged from the de-aerator through a nozzle 8 "

Overheated water (hot stream) is fed to the deaerator through the dispensing

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the collectors 6 and through the individual inlets 5 of the inlet are brought in by trapezoidal evaporation chambers 4; Through the lateral inclined walls of the chambers perforated from the channels formed by them, the antifluid mixture in the form of opposing inclined high-speed jets is introduced throughout the depth into the layer of the moving fluid, which leads to mutual vortex penetration phases, the formation of a vapor-gas-liquid emulsion with a well-developed surface of contact between the phases and a high rate of its renewal. After being destroyed, the foamy The vapor-gas mixture is condensed in the streams formed by the water distributor 2, 1, and the non-condensable aggressive gases are sucked through the pipe 9.

Thus, the proposed method of water de-aeration allows to intensify heat exchange processes by using heat not only of the steam, but also of the liquid phase of the heat transfer fluid with a uniform treatment of the deaerated water with a heating agent throughout the entire thickness of its layer on the sparging device.

Claims (1)

1. The method of thermal deaeration of water by arranging the contact of the heat transfer fluid and deaerated water in the jets and in the layer on a bubbling device, which is characterized by the fact that, in order to intensify the heat and mass transfer processes during vacuum deaeration, heat transfer to the deaerated water layer is carried out in two-phase states throughout the entire mass of the layer in the form of counter-jets. I 2, A vacuum deaerator containing water distributors installed in the housing and a bubbling device, nozzles for supplying deaerated and superheated water, draining deaerated water and non-condensable gases, characterized in that, in order to intensify the heat and mass transfer processes, the bubbling device is made in the form of a dispersed device made in the form of a dispersed device made in the form of a dispersed device in the form of a dispersed device for the heat and mass transfer processes. trapezoid evaporation chambers, equipped with individual nozzles for supplying superheated water, with the side naklo1P1a chamber perforated. T 5 Compiled by L. Simoya Editor N. Gunko Tehred A. Kravchuk 2717/16 Circulation 851 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 FIG. 2 Corrector with. Shekmar