SU1721392A1 - Steam-and-water preheater - Google Patents

Abstract

The invention relates to a power system and can be used in feedwater preheaters of regeneration systems of steam turbine plants of thermal and nuclear power plants. The aim of the invention is to increase the thermal efficiency of the vertical placement of the body due to the organization of the distribution of steam to obtain a speed effect. The steam heater has a housing 1 with a nozzle 2 for supplying heating steam, divided by partitions 6 into sections; a bundle 4 of heat exchange tubes, a part of which is enclosed in a steam chamber 16 with openings of steam flow communicated with nozzle 2. The heater is provided with a steam distribution manifold 8 in the form of a rectangular duct installed coaxially with the body 1 with openings 10, 12, 14 in the side walls 9, 11 and a cover 13 communicated with a steam chamber 16. The holes 10, 12 in the side walls of the duct are located between the partitions 6. 3 Il. + Js

Description

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The invention relates to a power system and can be used in steam-water heaters, in particular, in feed water heaters of regeneration systems of steam-turbine plants of thermal and nuclear power plants.

A heat exchanger is known, comprising a housing with a steam pipe and an annular steam distributing collector, on the side walls of which there are openings for passing steam to a heat exchange surface placed inside the housing 1.

The disadvantages of this design are the insufficient efficiency of heat exchange of a part of the heat exchange surface covered by the steam manifold located in the aerodynamic shade and insufficient intensity of heat transfer from steam to water due to the organization of steam distribution from the periphery to the center.

A heater is also known, comprising a housing with a heating steam supply pipe connected to a steam chamber within which a part of the heat exchanging surface is enclosed, and side and end openings for transferring heating steam to the heat exchanging surface 2 are made in the chamber walls.

The disadvantage of such a preheater is the insufficient heat transfer intensity.

The aim of the invention is to increase the thermal efficiency of the preheater when the housing is placed vertically,

This goal is achieved by the fact that in a steam-water heater containing a housing with a heating steam supply pipe, divided by partitions into sections, a bundle of heat exchange tubes, part of which is enclosed in a steam chamber connected to the specified steam pipe and provided with steam flow openings, is equipped with a steam distribution a collector made in the form of a rectangular box installed coaxially with the body with openings in the side walls and a lid communicated with the steam chamber, the openings in the side O walls of the ducts are located between these partitions.

Figure 1 shows the steam heater, longitudinal section; figure 2 - section aa in figure 1; figure 3 - section bb in figure 1.

The steam heater consists of a housing 1 with a nozzle 2 for supplying heating steam (GP) and a nozzle 3 for draining condensate of the HP. Inside the housing 1 is placed a tube bundle 4 formed by a U-shaped curved pipe 5, passing through the spacer partitions 6. The ends of the pipe 5 are fixed in the pipe grid 7.

In the free space of the tube bundle 4 formed by the bends of the tubes 5, a steam distribution manifold 8 of a boxed structure is placed, which consists of a side wall 9 with holes 10, a side wall 11 c holes 12, a cover 13 with holes 14 and end walls 15.

The nozzle 2 is in communication with the steam chamber 16 formed by the radial partitions 17, the outer casing 18, the inner casing 19 with the holes 20 and the wall 9 of the collector 8.

5 A feedwater chamber 21 is connected to the tube sheet 7 with a partition 22, which forms an inlet compartment 23 with feedwater supply connections 24 and an outlet outlet 25 with a distribution pipe

0 26 feedwater discharge. Above the inlet compartment 23, by means of the walls 27 of the tube bundle 4, a zone 28 is selected for cooling the condensate of the heating steam.

Steam heater works

5 as follows.

Feed water through the nozzle 24 enters the inlet compartment 23 of the chamber 21, through pipes 5 of the heat exchanger beam 4 performs a lifting and lowering motion, is heated and enters the exit compartment 25, from which it is removed from the preheater through the nozzle 26.

The heating steam through pipe 2 is directed to steam chamber 16, from which

5, part of the steam through openings 20 in housing 19 is transferred to the zone of tube bundle 4, and the rest of the steam is directed through channels formed by shells 18 and 19 to steam distribution manifold 8, from which through openings 10, 12 and 14, respectively, in wall 9 , in the walls 11 and in the cover 13 is supplied to the pipe 5 of the tube bundle 4.

Wash the pipe 5, the heating steam condenses, heats the water and drains on

5 tube rack 7 with the formation of a condensate level on it 7. Next, the condensate of the HP comes into the condensate cooler 28 and is discharged from the heater.

Thus, placing an additional box-like manifold in the heater makes it possible to organize steam distribution to obtain a speed effect and thereby increase the thermal efficiency of the heater.

Claims (1)

Claims of Invention A steam heater, comprising a housing with a heating steam supply pipe divided by partitions into sections, a bundle of heat exchange tubes, part of which is enclosed in a steam chamber communicated with said pipe and provided with steam flow openings in its wall, characterized in that. in order to increase thermal efficiency with vertical housing, it is additionally equipped with steam distribution 18 nineteen 2 20 Fie.2 A collector manifold, made as installed coaxially with a rectangular box body with openings in the side walls and a lid, is in communication with the steam chamber, with the openings in the side walls of the box between the partitions. one