SU840550A2 - Steam generator - Google Patents

Description

(54) STEAM GENERATOR

I

The invention relates to steam generators of saturated steam of nuclear power plants and can be used both in the creation of new steam generators and in the reconstruction of operated ones.

According to the main author. St. No. 705196 is known a steam generator comprising a housing connected to a source of feedwater with heat exchanger pipes installed in its lower part, connected to vertical, heating heatsink collectors, at least one of which in the zone above the heat exchange pipes is equipped with guides installed at its periphery. an I-tube with a pipe for supplying water to its cavity, with an economizer connected to the source of feed water, an economizer, communicated by its outlet section with a pipe for supplying water to the polo five guide flap 1J.

The disadvantage of this steam generator is reduced reliability due, in the first place, to possible dropping of water droplets into the upper parts of the collectors, the evaporation of which occurs with the release of chlorine ions, which can lead to cracking of the upper parts of the collectors, and secondly, the possible accumulation in the lower parts x cavities of the plates of corrosion products that can lead to cracking of the collectors in the zone of the lower parts of the guide plates.

The purpose of the invention is to increase reliability.

This goal is achieved in that the equalizing plate is provided with drain holes in the lower part, and its upper edge is located above the collector.

The drawing schematically shows a steam generator, a general view.

The steam generator contains a housing I connected to a source of feed water with heat exchange pipes 2 installed in the lower part of the eroi and connected to vertical inlet and outlet collectors 3 of the heating coolant (in the drawing, the output collector is not shown). The inlet manifold 3 of the heating coolant in the zone above the heat exchange tubes 2 is provided with a guide plate 4 along its periphery with a tube 5 for supplying water to its cavity. The housing 1 also has an economizer 6 connected to the feedwater source, communicated by its outlet section with a pipe 5 for supplying water to the cavity of the guide plate 4, which is provided with slotted holes 7 in its lower part, and its upper edge is located above the collector 3. Case 1 is connected to the source of feed water by means of a pipe 8. In the upper part of the case I, nozzles (not shown) are fixed for supplying steam to the consumer, and inside the case 1 in the area between the heat exchange tubes 2 and the nozzles for steam removal is placed steam aratsionnoe device 9 is provided with a sealing shell 10 installed with clearance around the guide flap loniero 4.

The steam generator works as follows., ...,

The heating coolant from its circulation circuit enters the inlet manifold .3, from which it is distributed through the heat exchange; pipes 2. Through pipes 2, the heating coolant transfers heat to the water boiling in the annular space. The cooled coolant is discharged into the output collector 3 (not shown), and from there into the circuit of its circulation.

Feed water is supplied to housing I by tube 8. Boiler water as a result of heating on pipes 2 generates steam, which passes steam separation device 9 and is directed through nozzles fixed in the upper part of housing I to the consumer. The level of boiler water mouth. Pour in the area of the flap 4. A portion of the feed water of the total flow rate entering the pipe 8 is sent to economizer 6, where it is heated to a temperature close to the saturation temperature. From economizer 6, water flows through pipe 5 into the cavity of the shield 4, fills this cavity and through the upper edge of the shield 4 is poured into the gap formed by the sealing shell 10 and the shield 4. Next

840550

the water is directed into the cavity of the housing I, located below the steam separation device 9. A part of the feed water entering the cavity of the shield 4 is discharged through the calibrated drain holes 7 below the level of the boiler water.

The required height of the water column in the cavity of the shield 4 is created by the pressure differential in the pipe 8 and the steam space of the housing 1, and the stability — the level of water over the collector 3 — when the feedwater and the boiler water level fluctuate, is provided by the overflow of water through the upper edge of the shield 4 water leaks through the holes 7. In addition, the drain holes 7 prevent the accumulation of corrosion products and excessive water boiling in the lower part of the cavity of the shield 4. Depending on the total cross-section of the drain holes 7, which FRESH is an independent variable, and the height of the shield 4, feedwater flow, and its display characteristics economizer 6 are defined in the optimal range. In this case, the location of the upper edge of the guide plate 4 above the collector 3 ensures a stable temperature distribution in the metal of the collector 3 over its entire height, thus increasing the reliability of the steam generator.

Claims (1)

Invention Formula Steam generator auth. St. 705196, characterized in that, in order to increase reliability, the guide plate is provided with drain holes in the lower part, and its upper edge is located above the collector. Sources of information taken into account in the examination 1./Authorial certificate of the USSR No. 705196, cl. F 22 B 1/16, 04/14/78.