SU485278A1 - Mixing heater - Google Patents

Description

The invention relates to mixing (contact) preheaters for regenerative heating of main steam turbine condensate with selected steam and is intended mainly for use in thermal power plants.

Mixing preheaters are known for regenerative heating of main steam condensate condensate by selective steam, comprising a housing, water and steam supply pipes, and water distribution devices in the form of perforated trays, arranged in batches in batches. Water is drained through a hole in the trays by gravity. However, the dimensions of such heaters in connection with a large distribution of water and the need to provide sufficient passages for heating steam between the rivers are large.

In order to increase the efficiency of heat exchange and reduce the dimensions of the preheater, the proposed water distribution devices are made in the form of perforated pipes located in U-shaped boxes that are installed in the direction of steam flow, and the steam duct is equipped with additional water distribution devices to reduce steam resistance.

In addition, the steam supply pipe can be made double-walled with an internal perforated and external solid wall, the cavity between which is connected to the water inlet pipe.

The size reduction of the preheater is carried out by limiting a more rational water distribution both inside and outside the body of the preheater. An increase in the efficiency of heat exchange occurs due to the injection of a part of water into the flow of steam moving at high speed in the steam supply pipe and steam line and the creation of well-turbulized water films inside the preheater.

FIG. 1 shows schematically the described mixing heater; FIG. 2 is a section A-A of FIG. one; in fig. 3 - the same for the version with additional walls.

The mixing heater comprises a housing 1 with water supply pipes 2 and a steam supply pipe w 3. A pipe 4 and 5 are used to supply steam and water to the heater. Inside the heater there are water distribution devices 6, which are perforated pipes 7, enclosed in U-shaped boxes 8 (Figures 2, 3). In one embodiment, the scabs may have an additional row of outer walls 9 and 10 (see Fig. 3), intended to form films from streams falling from the top of the roof of Kolobov. A layer on the roof box is formed with the help of shoulders 11. Water on the outer walls flows down from the slits 12. Inside the steam line, an additional water distribution device 13 is placed, which can have a perforated water chamber, water device, shower, etc. The steam inlet pipe 3 is made two stshnym. The inner tube 14 is perforated. The cavity 15 between the syringe outer wall and the perforated wall 14 is connected to the water inlet 2. The sheet 16 serves to direct the flow of steam and to sense the blows of water droplets moving together with the vapor. Steam from the selection tour & 1y according to question 4 goes to the steam supplying pipe 3 of the preheater housing 1, water (main condenser) through pipe 5 to the water supply pipe 2, in the additional water distribution device 13, in the double wall pipe 3, in pipes 7 and to (fobah 8, water is crushed into streams, films and drops, on which vapor condensation occurs. When the co-condensation of steam occurs, the water is heated to the temperature of the nappinge. Due to the part of the water distribution devices located outside the heater body, it sharply decreases with steam velocity both in the steam trap and in the preheater itself. This leads to a decrease in the steam resistance and reduces the dimensions of the preheater, which are limited by the maximum permissible velocity of the incoming steam flow to the stream of jets and Plok of the heated water. . A mixing preheater containing water distribution devices housed in a housing, and water and para-inlets, characterized in that, in order to increase the efficiency of heat exchange and reduce its size. heater, water supply means are arranged in the form of perforated pipes disposed in the U-shaped conduits which are mounted in the direction of movement of the steam, and the steam line of the steam supply pipe is provided with additional conductive vodoraspredelitelnymn reduction apparatus, the steam resistance. 2. The heater according to claim 1, which is also distinguished by the fact that the steam supplying pipe is double-walled with internal perforated and external solid walls, the cavity between which is connected to the water supply system and the pipe 1.

About About About About About

oh oh oh oh oh oh oh

7J

oh oh oh oh oh

0000 oh

oh oh oh oh 2

about 0000

/four

/

five