SU879138A1 - Steam-water preheater - Google Patents

Description

(54) STEAM HEATER

one

The invention relates to heat and power engineering, in particular to steam water heaters, and can be inpHMeneHO in power plants for regenerative heating of steam turbine condensate and 5 heating network water.

A steam heater is known, comprising a housing with nozzles for supplying heating steam, condensate drainage and exhaust suction, a water chamber with water inlet and outlet tubes 18 and a piping system placed inside the housing with guide partitions. A vertical partition is allocated to the evaporator cooler 5 with a steam supply to the “last” in its upper part 1.

The disadvantage of this preheater is its low efficiency due to low steam velocities in the main condensation zone.

The purpose of the invention is to increase the efficiency of the heater.

This is achieved by the fact that the evaporator cooler is placed in an additional housing, which forms a vertical channel with the heater body for supplying steam to the cooler through a window made in the wall of the additional housing, and the lower part of the vertical partition is buried under 30

the level of condensate forms a water seal with the wall of the additional housing, at the exit of which an additional perforated tray is installed.

FIG. 1 depicts .heater, general view; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one; in fig. 4 shows a section in FIG. one; “And FIG. 5 is a section of YYD in FIG. one.

In the upper part of the body of the heater is placed water on the chamber 1 with the inlet 2 and outlet 3 of the water. In the middle part of the body there is a pipe system of the main heating surface 4, an additional pipe system of evaporator cooler 5 and dividing partition 6, hermetically connected to ®newsching1) M, and the walls of the UNOV1OGO heater body and the bottom plane of the tube plate 7. On the case is installed top fitting 8 water metering device. Additional housing 9 of the evaporator is provided with a window 10. In the lower part of the additional housing there is a hydraulic lock 11, in the upper part of which a perforated sheet 12 is installed above the clamp 8. To arrange the movement of steam in the lower part of the housing, a guide sheet 13 is installed above the perforated sheet 12 14. The water seal And consists of

the central part of the partition 6 and vertical sheets 15 and 16, which are tightly connected to the side sheets. The additional body 9 and the body of the heater form a channel 17.

When the preheater is in operation, the water flow enters the water chamber 1, then into the tube bundle of the evaporator cooler 5 and into the pipe system 4, in which water makes several strokes and is discharged through the nozzle 3 of the water chamber 1 from the heater. The heating steam is directed into the annular space of the tube system 4 of the preheater, partially condenses therein, and the remaining part, defined by a juicy, its speed at the exit of the tube system 4, is directed to the window 10, through which steam enters the tube system of the iBbinapa cooler 5. The dimensions of the water seal 11 (FIG. 5) allow the steam flow to pass through the curtain of supercooled condensate jets, bypass the hydraulic lock, additional housing 9 on both sides, and go through channel 17 to window 10. To prevent steam from passing overheated condensate jets, perforated Sheet 12 and tray 14 (FIG. 3) are attached to the walls of the preheater housing. The flow rate of steam condensed on the supercooled condensate streams that flows out of the holes of the perforated sheet 12, and the steam condensed on the surface of the heating pipe of the additional pipe system of the cooler 5 is steam, you can adjust the choice of the size of the heating surface of the additional pipe cooler system 5 of the steam and the degree of flooding its condensate heating steam.

; The condensate of heating steam accumulates in the additional housing 9 and hydraulic seal 11. As the condensate consumption increases, the latter floods part of the pipe system 5, reaches the location of the perforated sheet 12, fills the dispensing tray 14 and flows through the holes in the sheet. Installing a perforated tray 14 away from the surface of the lagoon 5 allows condensate to be flooded with part of the heating surface 5 at any load of the preheater.

Thus, the steam flow condensed on the tubes of the nalrene surface of the evaporator cooler and on the jets of supercooled condensate transits through the entire main heating surface, significantly increasing the average steam velocity in it. Increased speed

the steam allows to actively ventilate the entire main tube bundle, which reduces the risk of corrosion damage. Corrosive gases are carried outside the main tube bundle to the zone

pipe system of an additional body, the heating surface of which is made of corrosion-resistant material. The increased vapor flow rate in the main heating surface creates conditions

to increase heat transfer coefficient.

Claims (1)

Invention Formula A steam heater, comprising a housing with heating steam supply nozzles, condensate drainage and exhaust suction, a water chamber with water supply and drainage shutters, and a piping system placed inside the housing with guide baffles, with a vertical partition divided into a steam cooler with a steam supply to the latter in its upper part, characterized in that in order to increase efficiency, the evaporator cooler is placed in an additional housing, which forms a vertical channel with the preheater housing to supply steam to the cooler through a window made in the wall of the additional housing, and the lower part of the vertical partition, buried beneath the level of condensate, forms a hydraulic lock with the wall of the additional housing, at the exit of which an additional perforated tray is installed. The source of information accepted in the VNI1.maniya three examinations: 1. US patent No. 3938588, cl. 165-118, published 1976. Btao3 condensate.