KR100423264B1 - Double spring spray valve for deaerator of boiler - Google Patents

Abstract

The present invention is in the form of a membrane using a spindle-type spindle that is stably elastically supported by a double spring in the degassing apparatus that separates and removes dissolved gas entrained in the feed water by contacting the feed water flowing in the boiler feed water with high temperature steam. It relates to a double spring injection valve for the boiler feed water degassing apparatus for injection into the furnace.

Double spring injection valve for boiler feed water degassing apparatus according to the present invention, the water supply inlet is formed in the upper circumference is fixed to the outlet of the header and the water supply outlet is formed in the lower portion; A shaft that is fitted to be movable up and down through a bush in a through hole at the center of the upper body; An outer spring elastically supporting an upper end of the shaft with respect to the body; An inner spring elastically supporting a lower end of the shaft with respect to the bush; It is coupled to the lower end of the shaft and moves up and down integrally with the shaft by the difference between the water supply pressure and the vapor pressure of the upper and lower, while forming a gap with the inner circumference of the water supply outlet of the body by the upper circumferentially downward downward Opening or closing the water supply outlet, and comprises a spindle for injecting the water flowing into the body downward in the form of a membrane.

Description

DOUBLE SPRING SPRAY VALVE FOR DEAERATOR OF BOILER}

The present invention provides a water supply in the form of a membrane using a spindle type to increase the contact rate to the gas in the degassing apparatus that separates and removes dissolved gas mixed in the water supply by contacting the water supply flowing through the water supply system of the boiler with high temperature steam. In particular, the present invention relates to an injection valve for a boiler feedwater degassing apparatus for injecting, and in particular, two shafts, which are combined with a hat-shaped spindle that injects water while being reciprocated according to the difference between the water supply pressure and the steam pressure, have two shafts for reciprocating the spindle. The present invention relates to a double spring injection valve for a boiler feedwater degassing apparatus, which is double elastically supported by a spring and evenly installed in an inclined manner, and evenly injects water without deflecting the shaft to either side.

Dissolved gases, such as oxygen, nitrogen, or carbon dioxide, contained in the boiler feedwater are closely related to corrosion of components in the boiler, so the boiler feedwater degassing apparatus is installed in the boiler feedwater system to separate and extract dissolved gases contained in the feedwater. have. Although the degassing apparatus is generally comprised as a single apparatus, it may be provided in a plurality of apparatuses.

The degassers are classified into chemical degassers using chemical methods and mechanical degassers using physical principles according to the method of separating gases. Particularly, in the mechanical degassers, the principle of diffusion of materials when the concentration is non-equilibrium is used.

The dissolved gas is rapidly separated from the feed water as the non-equilibrium is greater, but the shorter the moving distance, most of the boiler feed water degassing apparatus has a configuration that can increase the contact area between the feed water and steam by stirring or miniaturizing the feed water.

Figure 1 shows the internal configuration of the boiler feed water degasser.

As shown in the drawing, the water inlet pipe 13 and the water discharge pipe 18 are provided on the ceiling and the lower part, and the shell 10 which introduces steam through a steam inlet (not shown) to create a steam atmosphere, and an upper part thereof. And the lower case is an open container of the upper and lower cases 11 and 12 which form a limited space in which the steam introduced into the shell 10 at the predetermined height in the shell 10 can rise from below. And a header 14 which flows water along the upper portion of the shell 10 through the water inlet pipe 13 of the shell ceiling from the upper portion of the upper case 11, and disposed in the lower portion of the header 14. It consists of a plurality of injection valve 15, the tray stack 16 is formed by stacking a plurality of trays on the tray support 17 disposed in the lower case 12. In such a configuration, the boiler feedwater degasser is introduced into the header 14 inside the shell 10 through the feedwater inlet pipe 13 above the shell 10, and then flows along the header 14 and then several injection valves. It is sprayed in a conical shape toward the lower part of the shell 10 by the (15). Accordingly, as the injected water is heated by contact with the hot steam injected into the shell 10 through a steam inlet (not shown), dissolved gas mixed in the water is released from the water and discharged through the exhaust pipe 19. . Subsequently, water is reheated by gravity through the tray stack 16 under the shell 10 to desorb dissolved gas remaining about 3% and then is discharged through the water discharge pipe 18 under the shell 10. .

As shown in FIG. 2, the conventional injection valve 15 for the boiler feed water degasser used to inject the feed water in the degassing device is fitted into the outlet hole at the bottom of the header 14 and is fixed to the water supply inlet around the upper half. A body 20 having a water supply outlet 20b formed therein and a lower portion 20a, a shaft 21 fitted to be movable up and down in a through hole at the center of the upper surface of the body 20, and an upper end of the shaft 21 Compression spring 23 elastically supported via the retainer 22 and a spindle-shaped spindle 24 coupled to the lower end of the shaft 21 and the like, the spindle 24 acts on the upper and lower The body 20 through a gap (t) generated between the spindle 24 and the water supply outlet 20b of the body 20 as it moves downward as shown by the dotted line of Figure 1 by the difference between the water supply pressure and the steam pressure. ) The water flowing into the upper half of the membrane Were composed so that the jet towards the lower state.

However, the conventional injection valve 15 for the boiler feed water degasser is such that the spindle 24, which is a main product, is kept centered by its own weight, as shown in FIG. In the case of the above-described installation and inclined installation, the flow rate of the water supply fluctuates because the vertically moving spindle 24 is eccentric toward the center due to its own weight to form a non-uniform gap with the water supply outlet around the lower part of the body 20. In this case, there was a problem in that the feed water cannot be sprayed with a spray film having a uniform thickness. As a result, the water supply and steam do not contact each other uniformly, and thus, the performance of the boiler feedwater degasser has been reduced, that is, the dissolved gas removal rate of the boiler feedwater degasser. In addition, when the water supply pressure is suddenly changed, there is a problem in that the spindle 24 eccentrically swings to its left and right directions to generate vibration, and the spindle 24 locally collides with the body 20 to generate severe friction noise. . In addition, since the spindle 24 is biased to one side and rubbing on the body 20, there is also a problem that uneven wear of the spindle 24 proceeds rapidly and the life is very short.

Accordingly, the present invention, as described above to solve the problems of the conventional injection valve for boiler feed water degassing apparatus, the axial movement is supported on the body to support the vertical movement direction of the spindle while reciprocating with the spindle The guiding shaft is elastically supported by two springs at the top and bottom, so that the shaft is not deflected even when installed inclined, thereby providing a double spring injection valve for the boiler feed water degasser which can spray water evenly under any operating conditions. The purpose is.

1 is a cross-sectional view showing the configuration of a general boiler feed water degasser.

Figure 2 is a cross-sectional view of the injection valve for a conventional boiler feed water degasser.

Figure 3 is a cross-sectional view of the double spring injection valve for the boiler feed water degassing apparatus according to an embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

1: Body 1a: Water Inlet

1b: water supply outlet 2: shaft

3: support 4: outer spring

5: internal spring 6: spindle

7: bush 7a: jamming jaw

10: shell 11: upper case

12: lower case 13: water inlet pipe

14: header 15: injection valve

16: tray stack 17: tray support

18: water supply discharge pipe 19: exhaust pipe

C: condensation area

The dual spring injection valve for the boiler feed water degassing apparatus according to the present invention includes a body which is fitted into the ejection hole of the header and is fixed to form a water supply inlet along an upper circumference and a water supply outlet at a lower portion thereof; A shaft that is fitted to be movable up and down through a bush in a through hole formed in an upper center of the body; A support coupled to an upper end of the shaft; An outer spring inserted into an upper portion of the shaft and having an upper end and a lower end respectively fixed to the support and the upper surface of the body to elastically support the upper end of the shaft with respect to the body; An inner spring inserted into a lower portion of the shaft, the upper and lower ends being respectively fixed to the bush and the lower end of the shaft to elastically support the shaft with respect to the bush; Then, the water supply outlet of the body as the circumference of the upper surface inclined downward toward the outside while moving up and down integrally with the shaft by the difference between the water supply pressure and the steam pressure acting on the upper and lower portions of the shaft It is characterized in that it comprises a spindle for forming a gap with the inner circumference to open or close the water supply outlet, spraying the water supplied into the body downward in the form of a membrane.

In the double spring injection valve for boiler feed water degassing apparatus according to the present invention having the above configuration, the spindle is preferably a steel sheet of 1 to 5 mm thickness.

In addition, the outer spring and the inner spring is preferably the same as the spring constant.

In addition, the bush is preferably the outer peripheral surface is rougher than the inner peripheral surface.

Hereinafter, a preferred embodiment of a double spring injection valve for a boiler feed water degasser according to the present invention having the above configuration will be described in more detail.

3 is a cross-sectional view of the double spring injection valve 15 for the boiler feed water degasser according to an embodiment of the present invention.

As shown, in one embodiment of the present invention, the double spring injection valve 15 for the boiler feedwater degasser has each ejection of a header (reference numeral 14 in FIG. 1) disposed on top of the shell (see numeral 10 in FIG. 1). Body (1) is fitted into the ball and fixed, the shaft (2) is fitted to be able to move up and down via the bush (7) in the through hole in the center of the upper surface of the body (1), and the upper and lower ends of the shaft (2) External spring (4) is fixed to the upper end of the support and the upper surface of the body (1), and the lower portion of the shaft (2) is fitted to the upper end of the bush (7) and the shaft (2), An inner spring 5 is fixed to the lower end, and the hatch spindle 6 is coupled to the lower end of the shaft 2.

The body 1 is a frame of the double spring injection valve 15 for the boiler feed water degassing apparatus according to an embodiment of the present invention, is inserted into and fixed to each blow hole (14a) formed on the bottom surface of the header (14) Fixes and supports other configurations. In the center of the upper surface of the body 1, a through hole into which the shaft 2 to be described later is vertically movable is formed. In addition, a water supply inlet 1a is formed around the upper half and a water supply outlet 1b is opened and opened by the spindle 6 to be described later.

The shaft 2 is fitted to be movable up and down while interposing the teflon-treated bush 7 in the upper central hole of the body 1 with the spindle 6 coupled to the lower end thereof, respectively acting on the upper and lower surfaces thereof. The vertical movement of the spindle 6 is guided while moving up and down with the spindle 6 moving up and down by the difference between the water supply pressure and the steam pressure. The bush 7, which supports the outer circumferential surface of the shaft 2 and guides the shaft 2, is a Teflon-treated cylindrical bush 7, and the outer circumferential surface is relatively roughened relative to the inner circumferential surface, so that the shaft 2 can be reciprocated freely. While guiding, especially when the shaft 2 moves abruptly, it moves along the shaft 2 by a frictional force to cushion the rapid transfer of the shaft 2. The bush 7 is configured to fit from the bottom through the through hole of the body 1, the locking jaw (7a) is formed on the outer periphery of the lower end so as not to be separated from the through hole, the upper end of the through hole of the corresponding body (1) On the inner circumference, the separation prevention jaw 1c to which the locking jaw 7a is engaged is molded.

The outer spring 4 is a compression spring, the upper end of which is coupled to the support 3 coupled to the upper end of the shaft 2 and the lower end of the shaft 2 which is vertically moved by being fixed to the upper surface of the body 1. The upper end is elastically supported with respect to the body (1). When the water supply pressure on the upper side of the spindle 6 is reduced by the shaft 2 moving downward with the spindle 6 by the upper water supply pressure, the shaft 2, that is, the spindle 6 is returned.

The inner spring 5 is a compression spring that is fitted to the lower portion of the shaft 2 and the upper and lower ends are fixed to the bush 7 and the lower end of the shaft 2 with the upper and lower ends compressed and displaced. The lower end of the shaft 2 is elastically supported with respect to the bush 7. In particular, the impact of the spindle 6, which is elastically supported by the shaft 2, which is relaxed by the downwardly moving shaft 2 and then returns rapidly due to a sudden drop in water supply pressure, collides with the body 1, is alleviated.

Spindle 6 is a hat-shaped steel plate, the center of which is coupled to the lower end of the shaft (2) is moved up and down by the difference between the water supply pressure acting on the top and the steam pressure acting on the bottom, downward toward the outside Opening the water supply outlet in the form of a gap between the water supply outlet 1b and the inner circumferential surface of the body 1 with an inclined upper surface, and the water supplied into the body 1 is sprayed downward in the form of a hat-shaped membrane. To be.

In the above configuration, the spindle 6 generates an inertial force proportional to its own weight during up and down movement, so that the inertial force is not large so as to press-process a thin steel sheet having a thickness of 1 to 5 mm, especially a stainless steel sheet having a thickness of 3 mm. What you make is used.

According to the configuration as described above, the double spring injection valve 15 for the boiler feed water degasser according to an embodiment of the present invention, the water supply pressure and steam acting on the spindle 6, the spindle 6, the lower surface Water flows in the upper half of the body 1 while moving downward along the header (14 in FIG. 1) by opening downward the outlet 1b of the body 1 in the form of a gap t by the pressure difference. It is sprayed toward the bottom in the form of a film.

In this water supply spray action, the spindle 6 is sprayed because the center, upper and lower ends of the shaft 2 are elastically supported by the bush 7, the outer spring 4 and the inner spring 5, respectively. Even when the valve 15 is installed to be inclined, the body 1 does not deviate to either side and moves up and down in the axial direction of the shaft 2 without causing left and right rocking without causing vibration caused by the left and right swing of the spindle 6. The water supply outlet 1b is opened with a uniform gap t. Therefore, since the contact rate with respect to the steam can be increased by spraying the feed water with a spray film having a uniform thickness, it is possible to greatly increase the degassing rate of the dissolved gas in the feed water. In addition, when the water supply pressure suddenly changes, especially when the water supply pressure is suddenly lowered, the spindle 6 is reduced in weight and the inertial force is reduced, and the body (in the state of being substantially buffered by the inner and outer springs 5 and 4) 1) the impact noise of the spindle (6) and the body (1) is very small. In addition, there is an advantage that the wear of the spindle 6 due to the eccentricity of the spindle 6, which is a factor of shortening the life of the valve, is suppressed, so that its life is also long.

For reference, in FIG. 3, the solid arrow indicates the flow direction of the feed water, and the dotted line arrow indicates the steam flow direction.

As described in detail above, in the case of the double spring injection valve for the boiler feedwater degasser according to the present invention, the shaft is elastically supported at the upper and lower ends thereof by the outer and inner springs, respectively, so that the shaft moves up and down straight in the axial direction. The spindle guided to the shaft also opens and closes the water supply outlet of the body with a uniform gap without causing vibration due to left and right swinging. Therefore, the dual spring injection valve for the boiler feed water degassing apparatus according to the present invention sprays the feed water into the spray film having a uniform thickness while the spindle moves straight in the axial direction of the shaft regardless of the installation angle, thereby improving the contact ratio between the feed water and the steam. As a result, the degassing rate of the dissolved gas in the feed water can be greatly increased.

In addition, when the water supply pressure changes suddenly, especially when the water supply pressure drops abruptly, the spindle is lighter and the inertia force is reduced, and the spindle and the body are impacted by the shock absorber. There is an advantage in that the wear life of the spindle is suppressed due to the spindle eccentricity, which is very small and is related to the life of the injection valve.

Claims (4)

A body configured to be fitted into the outlet hole of the header to form a water supply inlet along an upper circumference and a water supply outlet at the bottom; A shaft that is fitted to be movable up and down through a bush in a through hole formed in an upper center of the body; An outer spring inserted into an upper portion of the shaft and fixed to an upper end and a lower end coupled to an upper end of the shaft and an upper surface of the body to elastically support an upper end of the shaft with respect to the body; An inner spring inserted into a lower portion of the shaft and having an upper end and a lower end fixed to the bush and a lower end of the shaft to elastically support the shaft with respect to the bush; It is coupled to the lower end of the shaft and moves up and down integrally with the shaft by the difference between the water supply pressure and the steam pressure acting on the upper and lower parts, the inner peripheral portion and the gap of the water supply outlet of the body as the upper circumference inclined downward toward the outside Forming and opening or closing the water supply outlet, the dual spring injection valve for the boiler feed water degasser characterized in that it comprises a spindle for injecting the water supplied into the body toward the bottom in the form of a membrane. The method of claim 1, The spindle is a double spring injection valve for the boiler feed water degasser characterized in that the steel sheet of 1 to 5 mm thickness. The method according to claim 1 or 2, Double spring injection valve for the boiler feed water degasser characterized in that the outer spring and the inner spring has the same spring constant. The method according to claim 1 or 2, The bush is a double spring injection valve for the boiler feed water degasser characterized in that the outer surface is greater than the roughness of the inner surface.