JPH0646084B2 - Blower device in boiler - Google Patents

Description

TECHNICAL FIELD The present invention relates to a blowing device in a boiler that can efficiently remove fine water droplets, sludge, and concentrate contained in steam (hereinafter, simply referred to as steam). It is a thing.

[Conventional technology]

Conventionally, fine water droplets in steam extracted from a boiler are separated by a steam separator, and sludge and other concentrates generated in the boiler are removed by intermittently blowing.

That is, when the boiler is operated, over time,
Boiler water is concentrated, and scale etc. adheres to the inner surface of the heat transfer tube,
Sludge accumulates on the bottom of the can. If this is left unattended, it may lead to an accident of water pipe rupture. Therefore, in order to keep the concentration of boiler water at a specified value, a method of intermittently blowing can water from the bottom of the can is adopted. Continuous blowing is also generally performed as a method for keeping the concentration of canned water constant, but the conventional method is to take out saturated water from the bottom of the boiler as saturated water.

On the other hand, a conventional drain separator is generally a device of a type that introduces steam into a cyclone to separate fine water drops by centrifugal force, or a device of a type that changes the direction of steam by 180 degrees to separate fine water drops. Is used for.

In addition, Japanese Utility Model Application No. 57-1780 (Japanese Utility Model Application No. 58-1074).
The No. 04) microfilm describes a configuration in which an auxiliary brackish water separator is provided in a transport pipe for transporting steam and hot water in a geothermal power plant.

Japanese Unexamined Patent Publication No. 51-48003 discloses a brackish water separator in which a two-phase flow transport pipe for transporting steam and hot water is provided with a front separator.

Japanese Patent Application No. 54-53344 (Japanese Utility Model Application No. 55-154898)
No.), a drain discharge device is provided in which a dent portion is provided inside a water / water mixing pipe, a discharge port is provided at the tip of the dent portion, and a discharge pipe is vertically attached to the discharge port from below. ing.

Japanese Utility Model Application No. 53-122275 (Japanese Utility Model Application No. 55-38088)
No.) microfilm, a drain discharge conduit is installed vertically from below on the bottom surface of a horizontal steam pipe, and an inner pipe is provided in this drain discharge conduit, and the inside of the frozen conduit has a high temperature. An automatic freeze eliminator is described in a drain discharge device adapted to automatically exclude freezing with steam.

[Problems to be Solved by the Invention]

However, in the above-mentioned conventional method, a large-sized steam separator is required, so the cost is high, and in the above conventional drain separator, the cost is high, the installation space needs to be wide, and the structure is complicated. Therefore, there is a problem that the pressure loss is large.

Also, in a once-through boiler with a steam separator, the steam generated from the boiler is wet steam until it enters the steam separator, and moisture is removed by the steam separator, and dry steam is fed to the load side. Supply. If the continuous blow water of the boiler can be taken out from the steam pipe of the steam separator,
Blow water that is more concentrated than any other part in the boiler can be discharged more efficiently. Generally, the continuous blow amount is 5 to 7% of the evaporation amount, and is about 10% at most. However, since the primary side of the steam separator is a steam mixture, it is difficult to extract only the water in the steam, and continuous blow water has not been taken out from this position in the past.

In view of the above points, the present inventor, as a result of diligent research, found that by attaching a drain separator to the steam pipe, the required continuous blow amount can be efficiently taken out as saturated water.

Incidentally, Japanese Utility Model Application No. 57-1780 (Japanese Utility Model Application No. 58-1074)
No. 04), JP-A-51-48003.
Gazette, Japanese Utility Model Application No. 54-53344 (Japanese Utility Model Application No. 55-15)
4898) and Japanese Patent Application No. 53-12
The invention described in the microfilm of No. 2275 (Actual No. Sho 55-38088) has a structure in which a drain separator is vertically attached from below to the horizontal part of the water / water mixing pipe, but it flows in the water / water mixing pipe. Since the flow direction of the air-water mixture does not change even when passing through the drain separator, fine water droplets, sludge, and concentrate are difficult to flow downward, and there is a problem in that these take-out efficiency is poor.

The present invention has been made based on the above findings in order to solve the problems of the conventional method.
(EN) Provided is a blower device for a boiler, which can be made compact and has a simple structure, which has a high efficiency of extracting drainage sludge, a concentrate, etc., requires less pressure loss and installation space, and can reduce cost. That is the purpose.

[Means and Actions for Solving the Problems]

In order to achieve the above-mentioned object, the blower in the boiler of the present invention will be described with reference to the drawings, in which a drain is provided at a horizontal portion of a steam / water mixing pipe 2 that connects the boiler 1 and a steam / water separator 4. In the blower of the boiler in which the separator 3 is vertically inserted and fixed from below, the drain separator 3 is a collision plate 1 against which a steam-water mixture collides.
2 and a small cylinder 7 continuously provided under the collision plate 12,
A drain discharge pipe 16 connected to the lower part of the small cylinder 5;
The drain separator 3 is fixed so that a space 8 is formed between the upper end of the collision plate 12 and the upper part of the inner wall of the water-water mixing pipe 2 and the air-permeable structure 14 provided in the small cylinder 7. It is characterized by being.

The steam-water mixture extracted from the boiler 1 is used as a steam-water mixing pipe 2
After being introduced into the drain separator 3 provided in the horizontal part in the middle of the process to remove most of fine water droplets, sludge, and concentrate, the air-water separator 4 is introduced to separate into dry steam and water. To be done. Therefore, the capacity of the steam separator 4 can be reduced, and the blowing operation can be performed at the same time.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. Second
In FIG. 3 and FIG. 3, 2 is a horizontal steam / water mixing pipe connecting the boiler and the steam / water separator. A short pipe 6 having a flange 5 is attached to the lower portion of the steam / water mixing pipe 2, and this short pipe is attached. 6 and a water-mixing pipe 2 with a small cylinder 7,
A space 8 is formed between the upper end of the and the upper part of the inner wall of the steam mixing tube 2,
Moreover, the small cylinder 7 is inserted so that the lower end thereof projects from the short pipe 6. The lower end of the short pipe 6 is a blind flange 10 except for the small cylinder part.
Is closed by. The small cylinder 7 has an opening 11 formed by cutting the front surface of a portion located in the water-water mixing pipe, and the back surface of the small cylinder forms a collision plate 12 to form the drain separator 3. Further, a breathable structure 14 such as a wire mesh, steel wool, punching metal or the like is provided below the opening. The lower part of the small cylinder 7 has a squeezing part 15 so that drain can be collected
Is provided, and a thin drain extraction pipe 16 is connected to the narrowed portion 15. A screw portion 17 is provided at the lower end of the drain extraction pipe 16. It should be noted that a thick drain extraction pipe may be connected and the lower end of the drain extraction pipe may be narrowed without squeezing the throttle portion 15 too much. In this case, the narrowed portion 15 merely serves to match the diameter of the drain discharge pipe having a smaller diameter, and functions as a receiving pipe portion.

In the blower configured as described above, the steam-water mixture flowing in the steam-water mixing pipe 2 collides with the collision plate 12 to change its flow direction, and at this time, minute water droplets, sludge, and concentrate are vaporized. Flows downward together with the portion, contacts the breathable structure 14 having a large contact area such as a wire mesh, and separates fine water droplets, sludge, and concentrate from the steam.

FIG. 4 shows another embodiment of the present invention. The blower according to the present embodiment is provided with a breathable structure 20 such as a wire mesh, steel wool, and punching metal on the front surface of the collision plate 12 through a space 18, and the contact area of steam is increased to separate drainage. It is designed to improve efficiency.
Other configurations and operations are similar to those in the case of FIG.

FIG. 5 shows another embodiment of the present invention. In the blower of this embodiment, a large number of protrusions 21 such as studs are provided on the front surface of the collision plate 12 to increase the contact area of steam to improve the drain separation efficiency. Other configurations and operations are similar to those in the case of FIG.

〔The invention's effect〕

Since the blowing device in the boiler of the present invention is configured as described above, concentrated blow water can be efficiently taken out. Therefore, energy can be saved and the amount of chemicals required for water treatment can be reduced. Further, when discharged from the bottom of the can, sludge or the like adheres to the valve to cause a problem such as leakage, but the device of the present invention can solve the above problems. In addition, the steam separator can be downsized and the blow operation can be performed at the same time. Moreover, the structure of the blow device is simple, the drain extraction efficiency is good, the pressure loss is small, and the installation space is small. And the cost can be reduced.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the vicinity of a blower in a boiler of the present invention, and FIG. 2 is a longitudinal sectional explanatory view showing one embodiment of the blower of the present invention (II-II sectional explanatory view of FIG. 3), Third
The drawing is a sectional view taken along the line III-III in FIG. 2, FIG. 4 and FIG.
The figure is a vertical cross-sectional view showing another embodiment of the present invention. 1 ... Boiler, 2 ... Air-water mixing tube, 3 ... Drain separator, 4 ... Air-water separator, 5 ... Flange, 6 ... Short tube, 7 ... Small cylinder, 8 ... Space, 10 ...... Blind flange,
11 ... Opening part, 12 ... Collision plate, 14 ... Breathable structure, 15 ... Throttle part, 16 ... Drain extraction pipe, 17 ...
Screw part, 18 ... Space, 20 ... Breathable structure, 21 ...
… Protrusion

Claims (1)

[Claims] 1. A boiler in which a drain separator (3) is vertically inserted from below and fixed to the horizontal portion of a steam / water mixing pipe (2) connecting the boiler (1) and the steam / water separator (4). In the blower device, the drain separator (3) includes a collision plate (12) on which the air-water mixture collides, a small cylinder (7) connected to the lower part of the collision plate (12), and the small cylinder (7). The drain discharge pipe (16) connected to the lower part of the cylinder and the breathable structure (14) provided in the small cylinder (7). The upper end of the collision plate (12) and the water-water mixing pipe ( A blower in a boiler, wherein a drain separator (3) is fixed so that a space (8) is formed between the drain separator (3) and the upper part of the inner wall.