JPH10311505A - Steam separation device of multitubular once-trough boiler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steam separation device of a multipipe once-through boiler in which the steam separation performance is excellent, the appearance of a whole boiler is simple, and the space can be saved. SOLUTION: In a steam separation device of a multitubular once-through boiler in which an annular upper header 2 and a lower header 1 are connected to each other through a large number of water tubes 3, a steam separator 4 is formed annular, the annular steam separator 4 is arranged above the upper header 2, the steam separator 4 is connected to the upper header 2 through a plurality of steam inlet tubes 6, and baffles 9, 10 are provided in the steam separator 4 and the upper header 2, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-tube once-through boiler for separating water from steam-water mixture from a multi-tube once-through boiler to obtain steam with high dryness.

[0002]

2. Description of the Related Art FIG. 8 is a diagram showing the configuration of a conventional multi-tube once-through boiler provided with this type of steam-water separator. As shown in the figure, the multi-tube once-through boiler main body has a configuration in which an annular upper header 2 and a lower header 1 are connected by a number of water tubes 3. The steam-water separator 4 has a cylindrical shape, and is arranged outside the multi-tube type once-through boiler main body so as to extend in the height direction.
And the upper header 2 are connected by a steam introduction pipe 6. The bottom of the steam separator 4 and the lower header 1 are connected by a downcomer 11.

[0003] In the multi-tube once-through boiler provided with the steam-water separator of the above construction, the steam-water mixed steam flowing into the steam-water separator 4 from the upper header 2 through the steam introduction pipe 6 is subjected to the steam-water separation. The steam and the drain (water) are separated by using a centrifugal force or colliding with a baffle inside the vessel 4, and the steam is supplied to the outside from the upper steam extraction pipe 5, and the drain passes from the bottom through the downcomer 11. It is returned to the lower header 1.

[0004]

In the conventional multi-tube type once-through boiler, the steam-water separator 4 is arranged outside the boiler body in the height direction, so that a high steam-water separation effect is obtained. In order to maintain the above condition, the steam-water separator 4 must be mounted at a high position, and there is a problem that the exclusive space of the entire boiler device becomes large.

Further, since saturated steam flows inside the steam separator 4, the temperature of the steam separator 4 becomes high, and it is necessary to provide a heat insulating means and a cover to reduce heat loss and prevent burns. However, since the steam separator 4 is mounted outside the boiler main body, there is a problem that the heat retaining means and the cover are simplified.

Further, since the steam introduction pipe 6 is provided only at one location of the upper header 2, there is a limit in reducing the steam flow rate, and the mixing of can water into the generated steam increases. However, there is a problem that the dryness of steam is reduced.

Further, when steam is introduced from a single location, a water level difference h is likely to occur in the water pipe 3 on the side opposite to the water pipe 3 on the steam extraction side when the load fluctuates. And there is a problem that the dryness is reduced.

Further, the inside of the header is divided into a first steam chamber and a second steam chamber by a partition plate provided in the upper header of the multi-tube once-through boiler.
There is also a configuration in which the partition is divided into a steam chamber and an opening is provided in the partition plate so that the steam circulates in the second steam chamber and reaches the steam outlet. However, in this case, since water / water separation is performed in the upper header, there is a problem that sufficient water / water separation cannot be performed by the multi-tube once-through boiler.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has an object to provide a multi-tube type once-through boiler having a high steam-water separation performance, a simple appearance of the entire boiler device, and space saving. The purpose is to provide.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an invention according to claim 1 is a multi-tube once-through boiler having a configuration in which an annular upper header and a lower header are connected by a number of water pipes. A water separator, comprising an annularly configured steam-water separator, wherein the steam-water separator is disposed above the upper header, and the steam-water separator and the upper header are separated by a plurality of steam inlets. It is characterized by being connected.

The invention described in claim 2 is the first invention.
In the steam-water separator of the multi-tube once-through boiler according to
The ring of the steam separator is a partially missing ring.

Further, the invention described in claim 3 is the first invention.
Or the multi-tube once-through boiler steam / water separator according to 2, wherein one or more downcomers are provided at the bottom of the steam / water separator to return the drain separated by the steam / water separator to the lower header. It is characterized by having been provided.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a configuration of a multi-tube type once-through boiler equipped with the steam / water separator of the present invention, and FIG.
2A is a diagram showing a cross section taken along line XX of FIG. 1, and FIG.

The multi-tube type once-through boiler is constructed by connecting an annular upper header 2 and an annular lower header 1 with a number of water pipes 3 to an upper part of a multi-tube once-through boiler, and having an annular steam-water separator 4 disposed above the multi-tube type.
And the steam-water separator 4 and the upper header 2 are connected by a plurality of (two in the figure) steam introduction pipes 6.

A baffle 9 is provided inside the upper header 2, and a baffle 10 is also provided inside the steam separator 4. A steam extraction pipe 5 is connected to the upper portion of the steam separator 4, and the steam outlet pipe 5 is connected to the steam outlet pipe 5. A valve 13 is provided on the extraction pipe 5. Reference numeral 12 denotes an exterior covering the entire device including the steam separator 4 and the multi-tube once-through boiler.

In the multi-tube once-through boiler having the above structure, the steam-water mixture generated in the water pipe 3 flows into the upper header 2 and collides with the baffle 9 and acts on the primary air by the action of centrifugal force due to the swirling motion. Water separation is performed. Further, the steam flows into the steam / water separator 4 from the two steam inlet pipes 6, and performs secondary steam separation by the impact on the baffle 10 and the action of centrifugal force due to the swirling motion. (Load).

By configuring the steam-water separator as described above, steam-water separation is performed in two stages in the upper header 2 and the steam-water separator 4, so that steam with high dryness can be obtained. . Further, since steam flows into the steam separator 4 from the upper header 2 by the two steam introduction pipes 6, the difference in water level in the water pipe 3 is suppressed when the load fluctuates, and the steam flow rate decreases, and the steam flows into the steam. Of canned water is reduced.

Since the annular steam separator 4 is arranged on the upper header 2, the appearance of the entire boiler including the steam separator 4 is simplified, and the exclusive space of the entire boiler is reduced. . In addition, it is possible to provide a heat retaining means (not shown) and the exterior 12 together with the boiler main body, thereby reducing heat loss and eliminating the risk of a human body touching the high-temperature portion of the steam separator 4 and improving safety.

In the above example, the steam inlet pipes 6 for introducing steam from the upper header 2 to the steam separator 4 are provided at two places. However, the number of steam inlet pipes 6 is not limited to two but may be three or more. It is also possible. In this case, the water level difference of the water pipe 3 is further reduced.

FIG. 3 is a diagram showing another example of the mounting structure of the steam separator of the steam separator according to the present invention. As shown in the figure,
The steam introducing pipe 6a of the steam separator 4 and the steam introducing pipe 6b of the upper header 2 are connected by connecting means 7. As the connecting means, for example, a flange is provided at the tip of each of the steam introduction pipe 6a and the steam introduction pipe 6b, and the flanges are connected with bolts.
It is configured to be connected with a nut. When the inside of the upper header 2 is inspected by adopting such a mounting structure, the inside of the upper header 2 is easily inspected by removing the connecting means 7 and removing the steam separator 4. be able to.

FIG. 4 is a diagram showing another example of the configuration of the steam separator according to the present invention. In addition, the figure is a figure which shows the upper header of a multitubular once-through boiler, and a partial cross section of a steam separator. As shown in the drawing, a steam separator 4 is integrally provided above the upper header 2, and a steam inlet for introducing steam from the upper header 2 to the steam separator 4 is provided on the upper wall 2 a of the upper header 2. Are provided with a plurality of steam introduction holes 8. Although not shown, the upper header 2 and the steam separator 4 are provided with baffles as in the case of FIG. Even with such a configuration, substantially the same water / water separation effect as the water / water separation device having the configuration of FIG. 1 can be obtained.

FIG. 5 is a diagram showing another example of the configuration of the steam separator according to the present invention. In addition, the figure is a figure which shows the upper header of a multitubular once-through boiler, and a partial cross section of a steam separator. As shown in the figure, the present steam separator has a steam separator 4 integrally provided above the upper header 2 as in the case of FIG.
Here, in order to give directionality to the flow of steam flowing into the steam separator 4, the steam introduction hole 8 is formed into a pipe having a predetermined length. Although not shown here, the upper header 2 and the steam separator 4 are provided with baffles as in the case of FIG. Even with such a configuration, substantially the same water / water separation effect as the water / water separation device having the configuration of FIG. 1 can be obtained.

FIG. 6 is a diagram (plan view) showing another example of the configuration of the multi-tube once-through boiler provided with the steam separator according to the present invention.
It is. As shown in the drawing, the boiler, the blower 14 and other equipment necessary for the boiler operation are arranged at the upper part of the multi-tube once-through boiler, as shown in the drawing, and the planar shape of the steam separator 4 is partially missing. It is annular. The steam-inlet pipe 6 is used to connect the steam-water separator 4 from two locations of the upper header 2.
It is configured to introduce steam into the steam. Although illustration is omitted, baffles are provided in the upper header 2 and the steam separator 4 as in the case of FIG.

As described above, even if the steam-water separator 4 does not have a complete annular shape, the steam-water separator has a two-stage steam-water separation structure as in the case of FIG. A steam-water separation effect is obtained.

FIG. 7 is a diagram (longitudinal sectional view) showing another example of the configuration of the multi-tube once-through boiler provided with the steam separator according to the present invention. The point that the present water / water separator differs from FIG. 1 is that one or more downcomers 11 are provided at the bottom of the steam / water separator 4,
The point is that the lower end is communicated with the lower header 1 of the boiler. Thus, the drain separated by the steam separator 4 can be returned to the lower header 1.

The shapes of the baffles 9 and 10 provided inside the upper header 2 and the steam separator 4 in the above embodiment are merely illustrative examples, and the shapes of the baffles are not limited thereto. Is natural.

[0027]

As described above, according to the invention described in each claim of the present application, the steam-water separator is formed in an annular shape, and the steam-water separator formed in an annular shape is disposed above the upper header. Since the steam separator and the upper header are connected by a plurality of steam inlets, and baffles are provided inside each of the steam separator and the upper header, the following excellent effects can be obtained.

(1) Steam-water separation is performed in two stages, and high-quality steam with high dryness can be obtained.

(2) Since steam is introduced into the steam separator from a plurality of locations in the upper header, the steam flow rate can be reduced and the water level difference in the water pipe can be reduced, and the mixing of can water into the steam can be reduced. it can.

(3) By arranging the annular steam-water separator on the upper header, the appearance of the entire boiler device is simplified, the occupied space can be reduced, and the steam-water separator is kept warm together with the boiler body. It becomes easy to provide the means and the exterior, and the heat loss is reduced and the safety is improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of a multi-tube once-through boiler provided with a steam separator according to the present invention.

FIG. 2 is a view showing a structure of a steam-water separator part of FIG. 1;
2A is a diagram showing a cross section taken along line XX of FIG. 1, and FIG.

FIG. 3 is a view showing another example of a mounting structure of the steam separator according to the present invention.

FIG. 4 is a diagram showing another configuration example of the steam / water separation device of the present invention.

FIG. 5 is a diagram showing another configuration example of the steam / water separation device of the present invention.

FIG. 6 is a diagram (plan view) showing another configuration example of the multi-tube once-through boiler device provided with the steam / water separation device of the present invention.

FIG. 7 is a diagram (longitudinal sectional view) showing another configuration example of the multi-tube once-through boiler device provided with the steam / water separation device of the present invention.

FIG. 8 is a diagram showing a configuration example of a multi-tube once-through boiler provided with a conventional steam-water separator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower header 2 Upper header 3 Water pipe 4 Steam separator 5 Steam extraction pipe 6 Steam introduction pipe 7 Connecting means 8 Steam introduction hole 9 Baffle 10 Baffle 11 Downcomer pipe 12 Exterior 13 Valve 14 Burner and blower

Claims (3)

[Claims] 1. A steam / water separator for a multi-tube once-through boiler having a configuration in which an annular upper header and a lower header are connected by a number of water pipes, comprising: an annularly configured steam / water separator; The steam / water separator for a multi-tube once-through boiler, wherein the steam / water separator is disposed above the upper header, and the steam / water separator and the upper header are communicated by a plurality of steam introduction portions. 2. The steam / water separator for a multi-tube once-through boiler according to claim 1, wherein the annular shape of the steam / water separator is a partially broken annular shape. 3. A downcomer for returning the drain separated by the steam separator to the lower header is provided at the bottom of the steam separator.
The steam / water separator for a multi-tube once-through boiler according to claim 1 or 2, wherein one or a plurality of tubes are provided.