JP2001187307A - Horizontal steam separator for steam drum - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a horizontal steam separator for a steam drum capable of improving water separating performance at respective horizontal steam separators by equalizing the steam quantity introduced into respective horizontal steam separators, capable of preventing the generation of carry-over, capable of improving efficiency by suppressing a fall of steam temperature and also capable of avoiding undesirable influence on a turbine blade of a steam turbine. SOLUTION: A perforated plate 10 for controlling flow passage resistance is mounted at the inlet part of a steam inlet duct 8a of the horizontal steam separator 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal brackish water separator for a steam drum.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a boiler, in which 1 is a boiler main body, 2 is a burner for injecting fuel into a boiler main body 1 and burning it, 3 is a steam drum,
By injecting fuel from the burner 2 into the boiler main body 1 in a state where water in the steam drum 3 is supplied to a lower part of the furnace wall pipe of the boiler main body 1 via a downcomer (not shown), combustion gas is generated. The generated combustion gas and the water flowing through the furnace wall tube of the boiler main body 1 and the steam or water flowing inside the superheater (not shown) exchange heat with each other, and are heated by the heat exchange. The introduced steam is introduced into the steam drum 3 through a number of steam introduction pipes 4, and a horizontal brackish water separator 8 described later in the steam drum 3 (see FIGS. 4 to 6).
After steam separation is performed, only steam is guided from a steam outlet pipe 5 to a steam turbine (not shown), and the steam turbine is driven to drive a generator. It is designed to drain.

As shown in FIG. 4, the steam drum 3 is provided with a water storage section 3a to which water is supplied from a water supply line (not shown) as required and which lowers the water to a downcomer (not shown). A steam introduction chamber 3b defined between the section 3a and the partition wall 7 and into which steam containing water is introduced from a steam introduction pipe 4 (see FIG. 3); A steam introduction duct 3c disposed so as to project toward the center, and a steam introduction chamber 3b.
Steam containing water introduced into the steam introduction duct 3c from
After removing moisture in a plurality of horizontal brackish water separators 8 arranged on the steam introduction duct 3c, moisture is further removed in a V-shaped dryer 9 in which a large number of corrugated plates are disposed.
The steam is led from the steam outlet pipe 5 (see FIG. 3) to the steam turbine.

Each of the horizontal brackish water separators 8 is shown in FIGS.
, A steam inlet duct 8a connected to a steam inlet duct 3c so as to communicate with a steam inlet chamber 3b of the steam drum 3 and extending in a vertical direction;
The steam containing water introduced from the steam introduction chamber 3b into the steam introduction duct 3c is tangentially guided from the steam inlet duct 8a, and extends substantially horizontally so that the axis is substantially parallel to the axis of the steam drum 3. Centrifugal separation duct 8b,
A primary drain outlet 8c which is opened at a required position below the centrifugal separation duct 8b and discharges water separated by the centrifugal separation duct 8b as a drain to the water storage portion 3a; And a drain outlet 8e which is opened at the lower end of the drain duct 8d and drains the water separated by the centrifugal separation duct 8b as drain to the water storage 3a.
And a steam outlet 8f which is opened at both ends in the axial direction of the centrifugal separation duct 8b and discharges the steam from which water has been separated to the upper portion inside the steam drum 3.

In each of the horizontal steam separators 8, the steam containing water introduced from the steam introduction chamber 3b of the steam drum 3 into the steam introduction duct 3c is guided from the steam inlet duct 8a in the tangential direction of the centrifugal separation duct 8b. Then, the water contained in the steam is separated by the centrifugal force when swirling along the centrifugal separation duct 8b, and is discharged from the primary drain outlet 8c and the drain outlet 8e to the water reservoir 3a of the steam drum 3. And the steam from which the water has been separated is supplied to the centrifugal separation duct 8b.
From the steam outlet 8f to the upper portion of the steam drum 3.

Incidentally, as shown in FIG.
The horizontal brackish water separators 8 are arranged in two rows on the left steam introducing duct 3c in the inside, and the horizontal brackish water separators 8 are arranged in three rows on the right steam introducing duct 3c in the steam drum 3. This is because there is a difference in the amount of steam introduced from the steam introduction pipe 4 into the steam introduction chamber 3b of the steam drum 3 on the right and left sides, and the installation space is limited.

[0007]

In the horizontal steam water separator for a steam drum in which a plurality of the horizontal steam separators 8 are arranged in the steam drum 3 as described above, the amount of steam introduced into each horizontal steam separator 8 is described. Needs to be equalized, but in particular,
As shown in FIG. 4, when the number of the horizontal brackish water separators 8 arranged on the steam introduction duct 3c is different between the left and right,
An imbalance occurs in the amount of steam introduced into each horizontal brackish water separator 8, which affects the water separation performance in each horizontal brackish water separator 8. When so-called carryover, which is discharged from the outlet portion 8f, occurs, the steam temperature decreases and the efficiency decreases, and when solids such as silica are fed into the steam turbine, the turbine blades of the steam turbine are adversely affected. There was a drawback that measures were desired.

In view of such circumstances, the present invention can equalize the amount of steam introduced into each horizontal brackish water separator, improve the water separation performance in each horizontal brackish water separator, and prevent the occurrence of carryover. It is an object of the present invention to provide a steam drum horizontal brackish water separator capable of suppressing a decrease in steam temperature to improve efficiency and avoiding adverse effects on turbine blades of a steam turbine.

[0009]

According to the present invention, there is provided a steam drum having a water storage section and a steam introduction chamber, a steam inlet duct disposed in communication with the steam introduction chamber of the steam drum, and the steam drum. A steam containing water introduced into the steam introduction chamber is tangentially guided from the steam inlet duct and has a cylindrical centrifugal separation duct whose axis extends substantially horizontally, and is opened at a required position below the centrifugal separation duct; and A drain outlet for discharging water separated by the centrifugal separation duct as a drain to the water storage unit, and a steam outlet opening at an axial end of the centrifugal separation duct, are introduced into a steam introduction chamber of a steam drum. A horizontal brackish water separator for removing water from steam containing water, in a steam drum horizontal brackish water separator that is arranged in the steam drum, in the inlet portion of the steam inlet duct of the horizontal brackish water separator In which according to the horizontal steam separator device for a steam drum, characterized in that fitted with perforated plates for adjusting the flow resistance.

According to the above means, the following effects can be obtained.

When a perforated plate for adjusting the flow path resistance is attached to the inlet of the steam inlet duct of the horizontal brackish water separator, the difference between the horizontal brackish water separator where steam is easily introduced and the horizontal brackish separator where steam is difficult to be introduced is provided. And the amount of steam introduced into each horizontal brackish water separator no longer becomes imbalanced, making it difficult to affect the water separation performance of each horizontal brackish water separator. The so-called carryover, which is discharged together with the steam from the steam outlet, does not occur, the efficiency of the steam does not decrease due to the decrease in the steam temperature, and solids such as silica are not fed into the steam turbine. There is no need to worry about adverse effects on the turbine blades.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention. In the drawings, the portions denoted by the same reference numerals as those in FIGS. 3 to 6 represent the same components. 3 to 6
However, the present embodiment is characterized in that, as shown in FIGS. 1 and 2, the inlet of the steam inlet duct 8a of the horizontal brackish water separator 8 has In that the perforated plate 10 is attached.

The perforated plate 10 is formed by drilling a plurality of holes 12 having a required diameter in a metal plate 11 made of stainless steel or the like so as to correspond to the inlet of the steam inlet duct 8a of the horizontal brackish water separator 8. Connection flange 13 of introduction duct 3c and connection flange 1 of steam inlet duct 8a of horizontal brackish water separator 8
4 is clamped by tightening bolts and nuts 15.

FIG. 2 is a perspective view of the porous steam separator 8 arranged in three rows on the right steam introduction duct 3c in the steam drum 3 as shown in FIG. Although a plate 10 is shown, as shown in FIG. 4, a hole attached to the inlet of the steam inlet duct 8a of the horizontal brackish water separator 8 arranged in two rows on the left steam inlet duct 3c in the steam drum 3. The board 10
In order to correspond to the two rows of horizontal brackish water separators 8, the horizontal brackish water separators 8 are deleted by one row as shown by phantom lines in FIG.

As shown in FIG. 2, instead of forming the perforated plate 10 so as to extend over a plurality of rows of the horizontal brackish water separators 8,
It goes without saying that an individual perforated plate 10 may be attached to each horizontal brackish water separator 8 in each row.

Next, the operation of the above illustrated example will be described.

If a perforated plate 10 for adjusting the flow path resistance is attached to the inlet of the steam inlet duct 8a of the horizontal brackish water separator 8, a pressure loss occurs, and the pressure inside the steam inlet duct 3c is made uniform, and The difference between the horizontal brackish water separator 8 in which steam is easily introduced and the horizontal brackish water separator 8 in which steam is hardly introduced is reduced, and the amount of steam introduced into each horizontal brackish water separator 8 does not become unbalanced. The separation performance of water in the separator 8 is hardly affected, and so-called carryover, in which water and solids such as silica are discharged from the steam outlet 8f together with the steam, does not occur, and the steam temperature decreases. As a result, the solid content such as silica is not fed into the steam turbine, and there is no fear of adversely affecting the turbine blades of the steam turbine.

The perforated plate 10 is provided between the connection flange 13 of the steam introduction duct 3c and the connection flange 14 of the steam inlet duct 8a of the horizontal brackish water separator 8.
5 so that the horizontal brackish water separators 8 can be held by adjusting the attachment and detachment as necessary.
It is possible to reliably equalize the amount of steam introduced into the fuel cell.

In this way, the amount of steam introduced into each horizontal brackish water separator 8 can be equalized, the water separation performance in each horizontal brackish water separator 8 can be improved, and carryover can be prevented. The efficiency can be improved by suppressing a decrease in temperature, and adverse effects on turbine blades of the steam turbine can be avoided.

It should be noted that the horizontal brackish water separator for a steam drum according to the present invention is not limited to the above illustrated example, and various changes can be made without departing from the gist of the present invention. .

[0022]

As described above, according to the horizontal brackish water separator for a steam drum of the present invention, the amount of steam introduced into each horizontal brackish water separator is equalized to separate water in each horizontal brackish water separator. It is possible to improve the performance, prevent the occurrence of carryover, suppress the decrease in the steam temperature, improve the efficiency, and avoid the adverse effects on the turbine blades of the steam turbine. I can play.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an example of an embodiment of the present invention, and is a view corresponding to a section taken along line VV of FIG.

FIG. 2 is a plan view of a perforated plate according to an example of the embodiment of the present invention, and is a view corresponding to the view taken along the line II-II in FIG.

FIG. 3 is an overall schematic configuration diagram of a general boiler.

FIG. 4 is a cross-sectional view illustrating an example of a conventional steam drum.

5 is a side sectional view showing an example of a conventional horizontal brackish water separator, and is a view corresponding to a section taken along line VV of FIG. 4;

FIG. 6 is a perspective view illustrating an example of a conventional horizontal brackish water separator.

[Explanation of symbols]

 Reference Signs List 3 steam drum 3a water storage section 3b steam introduction chamber 8 horizontal steam separator 8a steam inlet duct 8b centrifugal separation duct 8c primary drain outlet (drain outlet) 8d drain duct 8e drain outlet 8f steam outlet 9 V-type dryer 10 perforated plate

Claims (1)

[Claims] 1. A steam inlet duct disposed in a steam drum having a water storage section and a steam introduction chamber so as to communicate with the steam introduction chamber of the steam drum, and introduced into the steam introduction chamber of the steam drum. Steam containing water is tangentially guided from the steam inlet duct and has a cylindrical centrifugal separation duct whose axis extends substantially horizontally; and water that is opened at a required position below the centrifugal separation duct and separated by the centrifugal separation duct. A drain outlet for discharging the water to the water storage unit as a drain, and a steam outlet that is opened at an axial end of the centrifugal separation duct,
A horizontal brackish water separator for a steam drum, comprising a plurality of horizontal brackish separators for removing water from the steam containing water introduced into the steam introduction chamber of the steam drum inside the steam drum. A horizontal brackish water separator for a steam drum, characterized in that a perforated plate for adjusting flow passage resistance is attached to the inlet of the inlet duct.