RU2760142C1 - Centrifugal drip deaerator - Google Patents

Abstract

FIELD: thermal power engineering.

SUBSTANCE: invention relates to the field of thermal power engineering. A centrifugal drip deaerator containing a cylindrical housing with upper and lower end caps, with tangential pipes for supplying deaerated liquid, a separator connected to the housing by means of holes in the housing, a vapor removal pipe, with a device for liquid dispersion, while the vapor removal pipe is made of two coaxially arranged pipelines: external and internal, while the external pipeline is connected to the separator, providing a vapor intake from the separator, and the internal pipeline passes through the entire deaerator and is connected to the container of the dispersing device, taking the vapor from the said container.

EFFECT: increase in the quality of water deaeration.

1 cl, 1 dwg

Description

The invention relates to the field of heat power engineering and can be used for thermal deaeration of feed water of steam boilers and make-up water of heating networks, as contact coolers of vapor of deaeration plants, and also as contact heat and mass exchangers when heating water due to direct contact with steam or hot gases.

Known centrifugal droplet deaerator, containing a cylindrical body with upper and lower end caps, with tangential pipes for supplying deaerated liquid, a separator connected to the body through holes in the body, a vapor outlet pipe. The centrifugal droplet deaerator is equipped with a device for dispersing a liquid, connected to the inner part of the separator through a device that changes the radius of rotation of the liquid from larger to smaller, and the vapor outlet pipe is connected to the separator. (RU2151341C1, publ., 20.06.2000).

The disadvantages of the known device are the low quality of water deaeration with insufficient performance and load range.

The technical problem is the elimination of the noted drawback.

The technical result consists in improving the quality of water deaeration due to the possibility of removing the required amount of vapor while reducing the specific overall dimensions and accelerating the processes of heat and mass transfer.

The problem is solved, and the technical result is achieved by the fact that the vapor outlet pipe is made of two coaxially located pipelines - an external and an internal pipeline. The external pipeline is connected to the separator, ensuring the intake of vapor from the separator, and the internal pipeline passes through the entire deaerator and is connected to the tank of the dispersing device, taking the vapor from the said tank.

The deaerator according to claim 1, characterized in that steam is supplied to the housing for heating and other various streams. Steam is supplied through the steam chamber, in which, due to the increase in volume, the steam pressure is reduced to the required one. The size of the steam chamber is calculated based on the steam pressure supplied to the deaeration. Water is heated by bubbling water with steam.

FIG. 1 schematically shows a centrifugal drip deaerator.

The described device contains a centrifugal-vortex deaerator stage, consisting of a water heating section 1, into which deaerated water enters through tangential pipes 2 with the possibility of swirling it inside the cylindrical walls of the compartment 1, the steam chamber 3 located around the walls of the water heating compartment 1 and having an inlet pipe 4 for supplying steam to the chamber 3 with the possibility of steam passage from the specified steam chamber 3 inside the water heating compartment 1 through the holes 5 made in its walls, the cyclone separator 6, with which the water heating compartment 1 is connected by means of technological windows 7 with the possibility of keeping the swirl, obtained in the water heating section 1, as well as the vapor removal pipe 8 installed inside the water heating section 1 along the longitudinal axis of water swirling in it with the possibility of releasing steam and gases from the inner part of the separator 6. The stage of the drip deaerator consists of a column 9, and connected with spray chamber 11 by means of radial holes 10 s possible the separation of the water flow into drops and their boiling when droplets from the column 9 enter the space of the spray chamber 11. In this case, from the spray chamber 11 there is an evaporator pipe 12 for removing steam and gas from its internal space, and the column 9 is in communication with the separator 6 at the funnel 13 with the possibility of supplying liquid to the column 9 while maintaining the swirl of its flow around the longitudinal axis of the column 9 and the formation of a film of water on its inner walls before separating the water into drops. The use of a stage of a drip deaerator provides the possibility of deaeration in the load range from 0 to 100%, since there is no need to maintain a constant pressure at the outlet of the deaerator for spraying. In addition, the formation of a water film on the inner surface of the column 9 provides additional deaeration due to the squeezing out of gases from the film at the stage before droplets are formed when water passes through the holes 10.

The device works as follows.

The device works as follows. Deaerated water enters the water heating compartment 1 through tangential nozzles 2 and acquires a rotational motion inside the cylindrical walls of compartment 1. A vertical interface of rotating media is established: water at the edges (at the walls), in the center - a vapor-gas mixture. Steam is supplied to the steam chamber 3 through the inlet pipe 4. The steam comes out of the steam chamber 3 through the holes (nozzles) 5, bubbling a layer of water rotating inside the compartment 1 and heats it. Part of the vapor condenses, and part goes beyond the interface to the central part of compartment 1. The vapor bubbles capture the dissolved gases. Further, water, non-condensable gases and a small excess of non-condensed steam are directed through the technological windows 7 into the separator 6. Deaerated water, due to the design of the windows, maintains rotational motion inside the separator 6. Steam and gases are separated into the central part of the separator 6 due to the action of centrifugal forces, all the vapor is directed to the pipe 8 to remove the vapor with aggressive gases, and the deaerated water through the funnel 13 enters the column 9 of the next dropping stage. At the same time, up to 99% of gases are removed from the water in the first stage. To remove the gases remaining in the water, a slightly different design is required, in which the separation of water and gases is carried out by the formation of small water droplets in a dropping stage. In the column 9, the water supplied to it continues to rotate around the longitudinal axis of the column 9, forming a film of water on its inner wall, which, due to centrifugal force, is squeezed out through relatively small radial holes 10, at the exit from which drops of water are formed, boiling in the spray compartment 11 ( or deaeration tank). Gases also evolve from the water film before droplets are formed. The resulting vapor is removed from the spray compartment through the evaporator pipe 12. The residual content of gases in the water after two stages of its treatment is not higher than the established norm.

At a water temperature below 100 ° C, the described deaerator can operate in a vacuum mode if the vapor removal pipes of the first and second stages of the device are connected to an ejector (not shown in the drawings) to suck off the vapor. Instead of steam, superheated water can be supplied to the heating chamber 12 as a heating medium.

When heating the deaerated water to the appropriate temperature, it is possible to do without additional supply of the heating medium to the heating chamber 3 (deaeration at the initial effect).

The versatility of the described deaerator allows it to be used in atmospheric-vacuum mode.

Thus, the use of the described deaerator makes it possible to improve the quality of water deaeration by removing more gases from the water while reducing the specific overall dimensions due to the acceleration of heat and mass transfer processes and the use of an additional purification stage, which also has increased efficiency in the removal of residual gases.

Claims (1)

A centrifugal droplet deaerator containing a cylindrical body with upper and lower end caps, with tangential branch pipes for supplying a deaerated liquid, a separator connected to the body through holes in the body, a vapor outlet pipe with a device for dispersing liquid, characterized in that the vapor outlet pipe is made of two coaxially located pipelines - an external and an internal pipeline, while the external pipeline is connected to the separator, ensuring the intake of vapor from the separator, and the internal pipeline passes through the entire deaerator and is connected to the container of the dispersing device, taking the vapor from the mentioned container.

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