SU719969A1 - Thermal deaerator - Google Patents

Description

. The invention relates to the field of power engineering and industrial heat engineering, namely to thermal power plants, and can be used for thermal power plants and industrial heating boilers.

A thermal deaerator, containing a deaeration cradle with nozzles for supplying water, steam and vapor extraction, jetting and bubbling plates, water-transfer and by-pass hydraulic locks with a drain mouth l.

A disadvantage of the known deaerator is that, when operating in variable conditions at a gliding heating steam pressure, there is a deterioration in the quality of water deaeration. This is due to the fact that when the pressure in the deaerator decreases, and also due to a decrease in the temperature of the water entering the deaerator, water boils up in the storage tank and a significant amount of accumulated

steam under a bubbling plate. At a certain rate of pressure reduction in the deaerator, the amount of vapor released exceeds the maximum load of the bubbling plate napoByto, which leads to an increase in the water level and pressure drop on it and, consequently, to a deterioration of the discharge of deaerated water through the hydraulic overflow valve. When this happens, the column is bled up through the water trap and the water overflows; space, accompanied by sharp water hammer and deterioration of the quality of deaeration.

The purpose of the invention is to improve the quality of deaeration and increase reliability in transient conditions.

This is achieved by the fact that the proposed deaerator is equipped with a water chamber installed in the drain neck, a hydraulic lock and a perforated sheet interposed between them, covering a part of the drain neck section,

And water to the chamber is connected to the water inlet by an additionally installed pipeline that forms a loop above the junction.

The drawing shows descriptive thermal deaerator.

The deaerator contains a deaeration column 1 with connections 2,3,4, respectively, for supplying water, steam and evacuating vapor, jet 5 and bubbling 6 plates, water transfer bypass 8 hydraulic locks, storage tank 9 with drain neck 10. Water is built in drain neck 10 on the chamber 11 and the hydraulic lock 12 and between them a perforated sheet 13, which overlaps a part of the cross section of the drain neck 10. The water on the chamber 11 is connected to the nozzle 2 for supplying water with an additionally installed pipe 14, which forms a loop above the connection point 15.

The deaerator works as follows.

The deaerated water enters column 1 through pipe 2 to the jet tray 5, from where it is streamed to the bubble plate 6, passes along it and passes through the water transfer valve 7 to the storage tank 9. Heating steam through pipe 3 is fed to the bottom of column 1 under the plate 6, where, interacting with the water on the plate 6, it forms a highly turbulent bubbling layer, in which additional heating and basic deaeration of water is carried out. Further, the steam and corrosive gases released during de-aeration come under the jet tray 5, where steam condenses on the jets of water flowing from the jet tray 5, provides the main heating and coarse deaeration of the latter, and non-condensable gases are discharged h & in line vshara. The loop 15 is placed at a height that compensates in normal conditions the existing differential between the pressure in the deaerator and the pressure entering the deaerator through the water connection 2. When the pressure in the deaerator drops, the difference between the pressure under the bubbling plate 6 and the pressure of the water entering column 1 through the pipe 2 increases. In this connection, at a certain moment the value of the pressure difference between the deaerator and the pressure of the water entering it exceeds the height at which the loop 15 and the water

through the loop 15 it is poured into the water chamber 11, from where it enters the perforated sheet 13, passes along it and through the hydraulic lock 2 is withdrawn together with the main flow, drained through the water transfer hydraulic lock 7 to the storage tank 9, the accumulator 9 vapor entering through the neck 10 into column 1 is condensed in a layer of cold water supplied to the sheet 13 from chamber 11, which results in a decrease in the amount of steam supplied under the plate 6 to the required value. The water supplied to the sheet 13 is heated and deaerated on contact with steam. The flow rate of this water is determined by its temperature and is 10-15% of the flow rate of deaerated water.

The use of the difference between the pressure of the water entering the deaerator and the pressure in the vapor space of the deaerator to bypass part of cold water in addition to the bubble plate 6 on the perforated sheet 13 built into the discharge neck 1O of the storage tank 9 allows, due to condensation on the sheet, a part of the saturated steam and reduce the pressure drop on the bubble plate 6, eliminate hydraulic shocks and dramatically improve the quality of deaeration in a wide range of load variations.

Claims (1)

Invention Formula A thermal deaerator containing a deaeration column with connections for supplying water, steam and vapor extraction, jet and bubbling plates, water transfer and bypass hydraulic locks and drain tank accumulator, characterized in that in order to improve the quality of deaeration and increase reliability transitional modes, the deaerator is equipped with a water chamber installed in the drain neck, a hydraulic lock and a perforated sheet located between them, which overlaps a part of the cross section of the drain neck and water to the chamber There is no pipe with a water inlet that is additionally installed - a pipe that forms a loop above the junction. Sources of information taken into account in the examination - 1. USSR Author's Certificate No. 383688, cl. C 02 B 1/10, 1972. Water Coda