RU148547U1 - SECTIONED DEAERATION COLUMN - Google Patents

Abstract

Sectionalized deaeration column for treating feed water of a steam-powered or combined-cycle plant, containing a vertical cylindrical body mounted on the drum of the steam boiler, inside of which at least three autonomous deaeration sections are installed uniformly around the circumference, each of which is made in the form of a cylindrical shell with a at least one nozzle for spraying deaerated water inside the shell, and the lower sections of all shells are connected to a divided radial partitions to the chambers according to the number of shells of the intake tank so that each chamber is part of the section, and the free space between the housing, shells and the intake tank serves to supply steam from the boiler drum into the inner cavities of the shells from the side of the nozzles into the zone of its contact with the sprayed nozzles water, and means for removing the vapor with air separated from the water outside the deaeration column, characterized in that the means for removing the vapor is also sectioned by the number of shells and made in the form of prima leading to the indicated shells of the evaporation channels, the lower ends of which are connected to the corresponding chambers of the water intake tank, and the upper ends have bends passing outward through the wall of the housing, and a lamella packet is installed in the lower part of each of these chambers in front of the entrance to the evaporation channel, which serves as the second film deaeration steps.

Description

Area of use

The utility model relates to a power system and can be used for deaeration of feed water in steam power plants (CC) and combined cycle plants (PTU).

State of the art

Known deaeration column (DC) for the treatment of PU feed water containing a vertical cylindrical body mounted on the tank for receiving deaerated water (DV), placed inside the body in its upper part of the nozzle for spraying deaerated water, located along the axis of the body of the cylindrical evaporation channel, coaxially with a shell with a narrowing in its lower part with a lead-out end for venting the DW, and an annular wall channel with respect to the housing for supplying steam to the zone of its contact with sprayed water, and under the contact zone that pair with sprayed water - an open glass for receiving DV with the formation of a water seal (GZ) with water drainage and lifting channels (Introduction of centrifugal-jet spray nozzles in deaeration devices of PGU-39 Sochinskaya TPP / Gombolevsky V.I., Afanasyev B.P. [ et al.] // Electric stations. 2009. No. 5. P. 15. [1]). In a recreation center of this type, a fairly complete degree of deaeration of the feed water is achieved, however, there is a high hydraulic resistance of the nozzles and a relatively narrow range of their regulation.

Overcoming the noted drawbacks of a recreation center is possible using the principle of sectioning of the contact zone, in which it is possible to disable individual sections in partial modes of operation of the apparatus. There are various options for the partitioning of the contact zone with a single evaporation channel for all sections, and with evenly placed inside the housing, coaxial with the housing of at least one circle, autonomous channels for venting the vapor from each section, which is reflected, for example, in taken as the closest analogue of utility model RU No. 95654 (IPC C02F 1/20, 2010, [2]). The disadvantage of this technical solution is the incomplete degree of deaeration of feed water. The design adopted for the closest analogue has the following disadvantages: unsatisfactory concentration of residual oxygen due to the secondary capture of gas bubbles by water jets and their subsequent capture by a stream of deaerated water into the outlet pipe. According to literature data, degassing is most effective when it is organized in several stages, stepwise reducing the concentration of oxygen in water. Therefore, it is not possible to obtain high quality deaeration in one stage in this design.

Utility Model Disclosure

The objective of the utility model is to obtain high-quality feed water (condensate). The technical result achieved by this model is to obtain the maximum degree of deaeration of feed water.

The specified technical result is ensured by the fact that in the DC for treating feed water of the PU containing at least three cylindrical shells with an open top mounted on the tank for receiving the DV vertical cylindrical housing, uniformly coaxial with it, the total inner space of which forms a contact zone steam with sprayed water, at least one nozzle is installed in the upper part of each shell, the lower sections of all shells are connected to a divided radial partitions n and cameras according to the number of shells with a water receiving capacity (VPE), the free space between the body, shells and VPE serves to supply steam to the inner cavities of the shells from the nozzles in its contact area with the sprayed water with water; the channel for venting is adjacent to the upper side of each chamber and each shell with the nozzle installed in it, together with the corresponding VPE chamber and the adjacent channel for venting the vapor, form an autonomous deaeration section, according to a utility model, at the bottom of each section VPE in front of the entrance to the channel for the removal of the vapor installed lamella package (PL), which performs the function of the second film stage of deaeration.

A causal relationship between the distinguishing features of a utility model and the technical result achieved is as follows.

In the lower part of each section of the VPE in the direction of the entrance to the channel for removal of vapor, a submarine is installed that performs the function of the second (film) stage of deaeration. On the lamellas, a cascading discharge of feed water occurs. Cascade discharge carries out water distribution in the cavity between the lamellas; Due to the vacuum, which provides the suction channel of the vapor, overheating of a thin film of feed water and effective secondary evolution of carbon dioxide and oxygen occur.

The presence in the deaerator of the second film stage of deaeration of feed water allows the release of up to 98% of the amount of non-condensable gases.

Brief Description of the Drawings

The utility model is illustrated by the following drawings: in FIG. 1 shows a DC with the placement of shells from cylindrical pipes installed in the contact zone of steam with water sprayed, for example, installed in the peripheral zone inside the housing space, opposite the channels for the removal of vapor is a submarine (4); in FIG. 2 is a cross-section along AA of FIG. one; in FIG. 3 is a cross-sectional view along BB of FIG. one; in FIG. 4 is a cross-section along G-D of FIG. one.

Detailed description of utility model

DC for processing feed water, for example, for vocational schools, according to a utility model, contains a vertical cylindrical housing 2 (Fig. 1-4) mounted on the tank 1 (Fig. 1) for receiving the DW (in this case, on the low pressure drum of the vocational heat recovery boiler) )

Six cylindrical tubes (shells) 3 with nozzles forming a contact zone of the sprayed water and steam (Fig. 1, 2) are evenly placed inside the casing 2 uniformly aligned with the circumference coaxial with the casing. In the upper part of each cylindrical body there is one autonomously controlled nozzle 5 (Fig. 1, 2). The lower sections of the cylindrical bodies are connected with VPE 6 (Fig. 1, 3), which has a narrowing in its lower part with a lead-out end for venting the DV, there is a packet of lamellas 4 (Fig. 1, 4) that performs the function of the second (film) stage deaeration. Between VPE 6 and housing 2, a wall channel 7 is formed (Figs. 1, 3, 4), which is used to supply steam taken from the tank 1 to the zone of its contact with sprayed water. In the lower part of the recreation center there is an open glass 8 (Fig. 1) for receiving the DV with a water outlet 9 (Fig. 1, 3, 4) and lifting 10 (Fig. 1) channels forming a water seal (GZ) 11 (Fig. 1). The inner space of VPE 6 is divided into sections by radial partitions 12 (Fig. 3, 4), where the PL 4 and the drainage channel 9 GZ are located.

The design of the lamella package:

- the lamellas are a sheet along the profile corresponding to the VPE section, having peripheral overflow holes with 1.5 mm flanges creating a film of feed water on the lamellas;

- to increase the area of deaeration, the lamellas are assembled in a bag having a slight bias towards the center, allowing feed water to cascade along the lower lamellas.

Inside the housing 2 are placed evenly, along a circle coaxial with the housing, independently disconnected channels 13 (Fig. 1, 2, 3, 4) for venting the vapor from each section, the lower ends of which are connected to the corresponding sections 6, and the taps from the upper ends by means of separate the fittings 14 (Fig. 1, 2) through the wall of the housing 2 are brought out.

On the drainage installations of the Far East, in order to increase the stability of the work of the recreation center, it is planned to install two circular GZs 11 and 15 sequentially located along the water (Fig. 1). GZ 11 is located in the lower part of the housing 2 of the recreation center, GZ 15 is in the lower part of the tank (low-pressure drum) 1, where the entire DW merges. GZ 11 is formed by a glass 8 and the outlet end of VPE 6. GZ 15 is formed by a glass 16 (Fig. 1) and the outlet end 17 (Fig. 1) of the funnel 18 (Fig. 1).

In order to eliminate the negative mutual influence of GB on each other and ensure their independent functioning, the funnel 18, which drains water from the GB 11 to the GB 15, has a hydraulic connection with the steam space of the housing 2.

In the upper part of the housing 2 of the recreation center, a flange connector 19 can be provided, which makes it possible to examine the condition of the internal elements of the column, repair them, and, if necessary, replace them. On the pipelines for supplying water to the nozzles 5, flange connectors 20 can be provided (Fig. 1), providing individual removal from the body 2 of each nozzle for maintenance or replacement.

Deaeration column operation

DC according to the utility model operates as follows. Feed nozzles are supplied to the nozzles 5 of each section. The nozzles 5 spray water and eject steam coming from the tank (low pressure drum) 1 through the wall channel 7 into the cylindrical shells 3, which form the contact zone of the sprayed water and steam in each section - the first stage of deaeration. There is a process of deaeration of feed water when it is heated by steam. Gases, together with a part of non-condensed vapor and particles carried away by DV through channels 13 for venting vapor from each section through fittings 14 through the wall of the housing 2 are output.

When cascading discharge of feed water through the lamellas collected in packages 4, an additional film stage of deaeration of feed water is provided.

The DV exhaust from the sections is carried out sequentially through two GBs 11 and 15, separating the space of the zone of contact of steam with sprayed water of each section from the wall channel 7 for supplying steam. Once in the tank (low-pressure drum) 1, the DV is mixed with the nutrient (boiler) water contained in it.

If it is necessary to disconnect individual sections of the recreation center, the corresponding devices for supplying feed water and removing the vapor from the sections are closed. On the lines of supply to the nozzles and the removal of the engine from the sections, disconnecting devices are not provided. When a separate section is turned off, the ejection effect of the corresponding nozzles ceases, a stationary water column is kept in the hot water separating the internal space of the disconnected section from the working one. As a result, fresh steam does not enter the disconnected section, it does not enter the vapor, and thereby a reduction in condensate losses is achieved when controlling the performance of the deaeration plant over a wide range while maintaining minimal pressure drops across the nozzles.

Two stages of deaeration make it possible to obtain high quality deaerated feed water with a residual concentration of oxygen and carbon dioxide of up to 3-5 μg / kg in this design.

Claims (1)

Sectionalized deaeration column for treating feed water of a steam-powered or combined-cycle plant, containing a vertical cylindrical body mounted on the drum of the steam boiler, inside of which at least three autonomous deaeration sections are installed uniformly around the circumference, each of which is made in the form of a cylindrical shell with a at least one nozzle for spraying deaerated water inside the shell, and the lower sections of all shells are connected to a divided radial partitions to the chambers according to the number of shells of the intake tank so that each chamber is part of the section, and the free space between the housing, shells and the intake tank serves to supply steam from the boiler drum into the inner cavities of the shells from the side of the nozzles into the zone of its contact with the sprayed nozzles water, and means for venting the vapor with air separated from the water outside the deaeration column, characterized in that the venting means is also sectioned by the number of shells and made in the form of prima leading to the indicated shells of the evaporation channels, the lower ends of which are connected to the corresponding chambers of the water intake tank, and the upper ends have bends passing outward through the wall of the housing, and a lamella packet is installed in the lower part of each of these chambers in front of the entrance to the evaporation channel, which serves as the second film deaeration steps.

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