JP2002079017A - Steam separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steam separator suppressing wear in the inner face of a lower end plate and the inner face of a drain pipe without deteriorating steam separation efficiency even if abrasive powders such as hard scales enter the inside of a separator. SOLUTION: A flow-in nozzle 26 for generating a swirling current and a swirling current supplying water flow-in nozzle 29 for introducing water in the reverse direction of the swirling current are installed in a side face of the lower part end plate 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a brackish water separator.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a boiler. In FIG. 4, reference numeral 1 denotes a boiler main body, 2 denotes a burner for injecting fuel into a boiler main body 1 and burns, 3 denotes a primary superheater, Is a secondary superheater, 5 is a tertiary superheater, 6 is a final superheater, 7 is a primary reheater, 8 is a secondary reheater, 9 is a economizer, and fuel is supplied from the burner 2 into the boiler body 1. By injecting and burning the fuel, a combustion gas is generated, and the generated combustion gas is circulated, and the secondary superheater 4, the tertiary superheater 5, the final superheater 6, the secondary reheater 8, the primary superheater 3. Primary reheater 7 and economizer 9
Heat exchange with the exhaust gas, and the exhaust gas after the heat exchange
After removing nitrogen oxides and sulfur oxides by a flue gas treatment device (not shown) such as denitration and desulfurization provided on the downstream side, it is released to the atmosphere.

On the other hand, FIG. 5 shows a feed / steam system of the above-mentioned boiler. The feed water of the boiler is heated by an evaporator 11 formed on a furnace wall of a boiler body 1 in which fuel is burned, and a nose is formed. Through the section 12, the steam and water are separated by the steam separator 13, and the steam separated from the water by the steam separator 13 passes through the ceiling of the boiler main body 1 and the peripheral wall 14 of the rear heat transfer section, and the primary superheater 3, superheated by the secondary superheater 4, the tertiary superheater 5, and the final superheater 6, and guided to the high-pressure turbine 15,
The high-pressure turbine 15 is driven to generate electric power, and the steam after driving the high-pressure turbine 15 is guided to the primary reheater 7 and the secondary reheater 8, where the primary reheaters 7 and After being reheated by the secondary reheater 8, the medium / low pressure turbine 16
And the steam after driving the medium / low pressure turbine 16 is guided to the condenser 17 and returned to the boiler feedwater, where the steam is supplied to the boiler feedwater. Is conveyed to the economizer 9 via a condensate desalination unit 18, a low-pressure feedwater heater 19 and a deaerator 20, and a high-pressure feedwater heater 22 by a feedwater pump 21. It is heated, sent to the evaporator 11, and circulated.

As shown in FIG. 6, the steam separator 13 has an upper end plate 24 and a lower end plate 25 integrally attached to the upper and lower ends of a cylindrical separator main body 23 arranged vertically. An inflow nozzle 26 for flowing the brackish water mixed fluid in a substantially tangential direction is connected to an upper side surface of the separator body 23, a steam outlet nozzle 27 is connected to the upper head 24, and a drain nozzle 28 is connected to the lower head 25. Are connected.

In the brackish water separator 13, a brackish water mixed fluid flows from the inflow nozzle 26 in a substantially tangential direction of the separator body 23 to form a swirling flow, and water having a higher specific gravity than the steam is formed on the inner surface of the lower head 25 by centrifugal force. Along the drain nozzle 28
The steam separated from the water is discharged from the steam outlet nozzle 27 via the upper end plate 24 while being discharged as drain from the steam generator.

[0006]

In the case of the brackish water separator 13 as described above, when wear powder such as a hard scale enters the separator main body 23, as shown in FIG. This causes a problem that the swirling flow stagnates at the bottom of the steam separator 13 to cause wear on the inner surface of the lower head plate 25 and the inner surface of the drain nozzle 28. For the sake of explanation, the diameter of the wear powder is shown to be considerably larger than the actual diameter.

For this reason, conventionally, the separator body 2
A vortex eliminator is mounted inside the lower end plate 3 and inside the lower end plate 25 to reduce the swirling flow on the inner surface of the lower end plate 25 and the inner surface of the drain nozzle 28.

However, mounting the vortex eliminator inside the separator main body 23 or the lower end plate 25 is not preferable because the brackish water separation performance is reduced and the vortex eliminator itself is liable to wear due to a decrease in the swirling velocity.

The present invention has been made in view of the above circumstances, and even when wear powder such as a hard scale enters the separator main body, the inner surface of the lower end plate and the inner surface of the drain nozzle are maintained without deteriorating the brackish water separation performance. It is an object of the present invention to provide a brackish water separator capable of preventing the occurrence of abrasion on the surface.

[0010]

According to the present invention, an upper end plate and a lower end plate are attached to upper and lower ends of a cylindrical separator body arranged in a vertical direction, and steam and water are attached to upper side surfaces of the separator body. In a brackish water separator that connects an inflow nozzle that allows the brackish water mixed fluid mixed with the mixture to flow in a substantially tangential direction, connects a steam outlet nozzle to the upper head plate, and connects a drain nozzle to the lower head plate. The present invention relates to a brackish water separator, wherein a swirl flow suppressing water inflow nozzle for inflowing water in a direction opposite to the swirl flow by the inflow nozzle is provided on a side surface of the head plate.

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

When abrasion powders such as hard scales enter the separator main body, if necessary, water is introduced from the swirl flow suppressing water inflow nozzle in a direction opposite to the swirl flow by the inflow nozzle. The swirling flow of the internal fluid that has flowed substantially tangentially to the separator body is weakened, and the abrasion powder does not stay at the bottom of the steam separator, and is discharged from the drain nozzle together with water.

As a result, even if abrasion powder such as hard scale enters the separator main body, the swirling flow is weakened, so that no wear occurs on the inner surface of the lower end plate and the inner surface of the drain nozzle. Unlike the case where the vortex eliminator is attached to the inside of the separator body or the lower end plate, there is no concern that the brackish water separation performance will be reduced due to the decrease in the swirling flow rate, or the wear loss of the vortex eliminator will occur.

[0014]

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

FIGS. 1 to 3 show an example of an embodiment of the present invention. In the drawings, the portions denoted by the same reference numerals as those in FIGS. 6 and 7 represent the same components. 6 and FIG. 7, the present embodiment is characterized in that, as shown in FIG. 1 to FIG. The point is that a swirl flow suppressing water inflow nozzle 29 for inflowing water in the direction is provided.

In the illustrated example, the swirl flow suppressing water inflow nozzle 29 is arranged in a plane with respect to the separator body 23 of the inflow nozzle 26 to which the inflow pipe 30 extending from the furnace wall tube of the boiler body 1 is connected (see FIG. 2). )
As shown in FIG. 3, it is connected to the side surface of the lower head plate 25,
A ring-shaped water pipe 33 is connected to the swirling flow suppression water inflow nozzle 29 via a water pipe 32 provided with a check valve 31 in the middle thereof. As shown, by connecting a water supply pipe 35 provided with a shut-off valve 34 on the way, and opening the shut-off valve 34 as necessary,
Water is supplied from the water supply pipe 35 to the swirl flow suppressing water inflow nozzle 29 via the ring-shaped water pipe 33 and the water pipe 32.

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

When abrasion powder such as hard scale enters the separator main body 23, the shut-off valve 34 is opened as necessary, and the ring-shaped water pipe 33 and the water pipe 3 are connected from the water supply pipe 35.
When water flows from the swirl flow suppression water inflow nozzle 29 through the nozzle 2 in a direction opposite to the swirl flow of the inflow nozzle 26, the swirl flow of the internal fluid flowing from the inflow nozzle 26 in a substantially tangential direction of the separator body 23 is generated Weakened and worn powder is brackish water separator 1
3 is discharged from the drain nozzle 28 together with water without staying at the bottom of the nozzle 3.

As a result, even if wear powder such as a hard scale enters the separator main body 23, the swirling flow is weakened, so that no wear occurs on the inner surface of the lower end plate 25 and the inner surface of the drain nozzle 28, Moreover, as in the conventional case, the separator body 23
Unlike mounting the vortex eliminator inside the lower end plate 25 or the like, there is no fear that the brackish water separation performance is reduced due to a decrease in the swirling flow rate or wear defects such as the vortex eliminator are generated.

In this way, even when abrasion powder such as hard scale enters the separator main body 23, abrasion occurs on the inner surface of the lower head plate 25 and the inner surface of the drain nozzle 28 without deteriorating the steam separation performance. Can be prevented.

It should be noted that the steam separator of the present invention is not limited to the above-described illustrated example, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

[0022]

As described above, according to the brackish water separator of the present invention, even if abrasion powder such as a hard scale enters the separator body, the brackish water separation performance is not reduced. An excellent effect of preventing abrasion from occurring on the inner surface of the lower head plate and the inner surface of the drain nozzle can be obtained.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an example of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along the line III-III of FIG. 1;

FIG. 4 is an overall schematic configuration diagram illustrating an example of a general boiler.

FIG. 5 is a schematic configuration diagram showing a water supply / steam system of the boiler shown in FIG.

FIG. 6 is an overall perspective sectional view illustrating an example of a brackish water separator.

7 is a partial cross-sectional view of an example of the brackish water separator shown in FIG. 6, and is a view conceptually showing a state in which abrasion powder flows.

[Explanation of symbols]

 13 Steam separator 23 Separator main body 24 Upper head plate 25 Lower head plate 26 Inflow nozzle 27 Steam outlet nozzle 28 Drain nozzle 29 Swirl flow suppression water inflow nozzle

Claims (1)

[Claims] 1. An upper end plate and a lower end plate are attached to upper and lower ends of a cylindrical separator main body arranged in a vertical direction, and a brackish water mixed fluid in which steam and water are mixed is substantially applied to an upper side surface of the separator main body. In a steam separator comprising a tangential inflow nozzle connected, a steam outlet nozzle connected to the upper head plate, and a drain nozzle connected to the lower head plate, a side surface of the lower head plate is provided with an inflow nozzle. A brackish water separator having a swirl flow suppression water inflow nozzle for flowing water in a direction opposite to the swirl flow.