JPH10328647A - Apparatus for removing fine particle from steam generator for producing pure steam and distilled water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for removing fine particles of such as fine solid matter, splashes of raw water, etc., from steam generated by a steam generator for producing pure steam and distilled water. SOLUTION: In this apparatus, an outer cylinder 19 having a smaller diameter than a can trunk 1 is joined to a first baffle plate 20 fitted in the inside in the can trunk 1 of a steam generator. A second and a third baffle plates 21, 22 are fitted in the inside of the outer cylinder 19. Flow guiding pieces 26, 27 and holes 28, 29 under the pieces are formed in the first and the second baffle plates 20, 21 and a hole 30 is formed in the third baffle plate 22. A small hole 31 is formed in the tip part of the outer cylinder 19. Such an apparatus 18 for removing fine particles is fixed in a lower part of the can trunk 1 of the steam generator between the inner and the outer cylinders.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam generator for producing pure steam and distilled water containing no viable bacteria or impurities, and a fine particle removing device for removing fine particles so as not to be mixed in the generated steam. About.

To produce distilled water, raw water is supplied to a steam generator and heated with steam to generate pure steam, and the generated steam is condensed to obtain distilled water. At this time, even if viable bacteria exist in the raw water, it does not need to be considered for viable bacteria removal because raw water is heated to a high temperature, but fine solid particles are contained in the raw water. If so, it is necessary to eliminate this. Such fine particles are taken out of the steam as droplets when the raw water boils and are taken out in the steam and included in the distilled water. Therefore, the fine solid itself is used as a pure steam and a steam generator for producing distilled water. In addition, it is necessary to take out the steam from which the raw water droplets have been removed. In this specification, the fine solid particles and the droplets are collectively referred to as fine particles.

[0003]

2. Description of the Related Art FIGS. 6 and 7 schematically show a device widely used as a steam generator for producing pure steam and distilled water. FIG. 6 is a longitudinal sectional view, and FIG. It is. A top plate 3 is connected to an upper portion of the can body 1 with a partition plate 2 interposed therebetween. A large number of heat transfer tubes 4 are fitted to the partition plate 2 except for the center portion so as to open toward the top plate 3. In the can body 1,
An inner cylinder 6 having a flange 6a formed at an upper end and an end plate 6b connected to a lower end is provided. The heat transfer tube 4 penetrates through the end plate 6 b and opens toward the bottom plate 7 connected to the lower end of the can body 1. A discharge pipe 8 that hermetically penetrates the bottom plate 7 is connected to the end plate 6b of the inner cylinder so that the inside of the inner cylinder 6 communicates with the outside of the can body.
9 is a raw water supply port provided on the top plate 3, 10 is a heating steam supply port provided on the can body 1 between the partition plate 2 and the flange 6a, and 11 is a generated steam supply provided on the can body 1 below the flange 6a. An outlet 12 is a drain port for draining water accumulated in the bottom plate 7 in a timely manner.

When using the steam generator configured as described above, an appropriate amount of raw water flows into the top plate 3 from the raw water supply port 9, and steam flows from the heating steam supply port 10. The raw water flows down in the form of a film along the inner surface of the heat transfer tube 4, is heated by the heating steam flowing around the heat transfer tube 4, boiled, and spouts from the lower end of the heat transfer tube 4 toward the bottom plate 7 as steam. . The condensed water of the heating steam condensed by the raw water heating and the remaining steam are discharged from the discharge pipe 8 to the outside of the steam generator.

The steam generated from the lower end of the heat transfer tube 4 is
It rises between the can body 1 and the inner cylinder 6 and is taken out from the generated steam outlet 11 and is cooled and condensed to become distilled water. When the steam generators are used in parallel as described above, the generated steam can be used as heating steam for the next stage steam generator.

When distilling raw water in this way, fine particulate solids containing raw water must of course be removed.
If the fine water droplets of the raw water that have not completely evaporated are taken out together with the generated steam, the purity of the pure steam and distilled water produced by mixing the fine solid particles contained in the water droplets into the generated steam is deteriorated.

As a configuration for preventing such accompanying fine particles,
Japanese Patent Publication No. 57-2041 discloses an apparatus for removing fine particles by providing a cyclone in a flow path of generated steam as shown in FIG. In FIG. 8, the same parts as those in FIG. 6 are denoted by the same reference numerals and are given the same names to explain the same. This device is provided with an intermediate cylinder 14 between the can body 1 and the inner cylinder 6. A spiral wing 15 is fixed between the inner cylinder 6 and the inner cylinder 6, and a small hole 16 is provided in the intermediate cylinder 14.

The steam generated while passing through the heat transfer tube in the inner cylinder 6 and jetting downward from the lower end of the inner cylinder 6 reverses and rises between the inner cylinder 6 and the intermediate cylinder 14 to form a spiral. It rises while rotating along the wing 15. Due to this rotation, the fine particles contained in the generated steam move to the intermediate cylinder 14 side, enter between the can body 1 and the intermediate cylinder 14 through the small holes 16, descend and fall on the bottom plate 7. .

As described above, in addition to the method of removing fine particles from the generated steam by the cyclone method utilizing the large flow velocity of the generated steam, a baffle plate is provided in the middle of the generated steam flow.
There is also a method of changing the flow direction of the generated steam flow with the baffle plate to remove fine particles.

[0010]

The above-described method for removing fine particles by the cyclone method is a preferable method because the fine particles are removed by centrifugal force using a high-speed flow of generated steam. There is a problem that the installation work is troublesome and the steam generator manufacturing cost increases.

[0011]

SUMMARY OF THE INVENTION According to the present invention, an outer cylinder is interposed in a generated steam passage between a can body and an inner cylinder of a steam generator for producing pure steam and distilled water. Between the outer cylinder and the can body, with the baffle plate provided with the through hole and the baffle plate provided with the through hole and the flow guide piece. The particles are separated by centrifugal force as a spiral flow while increasing the velocity by passing the flow through the holes, and the separated particles are discharged from the small hole at the top of the outer cylinder to the gap between the outer cylinder and the can body, and the fine particles are separated. The cyclone part to be removed and the baffle at the top change the flow direction of the vapor diagonally upward to constitute a particulate removal device that combines the structure of sedimenting and separating heavy particles with a high vapor density at a specific gravity difference. .

[0012]

The steam rising in the passage between the can body and the inner cylinder is blocked by the baffle plate, but passes through the through hole in a concentrated manner.
As a result, the steam flow rate increases. This steam flow is changed in direction by the flow guide piece to perform a spiral motion around the inner cylinder, and separates fine particles by centrifugal force. As for the flow velocity of the spiral movement, the effect of centrifugal force on the separation of fine particles increases because the velocity of the vapor flow is increased by the passage through the through holes. In addition, since the baffle plate is assembled to the outer cylinder and this outer cylinder is attached to the lower part of the steam generator, it can be manufactured easily and inexpensively, and can be easily assembled to the steam generator.

[0013]

1 to 5 show an embodiment of the present invention. FIG. 1 is a schematic longitudinal sectional view showing a position when a particulate removing device is attached to a steam generator shown in FIG. 6, and FIG. FIG. 3 is a schematic longitudinal sectional view of the particle removing device, FIG. 4 is a BB sectional view of FIG. 3, and FIG. 5 is a CC enlarged sectional view of FIG. The same parts as those in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 1, the particle removing device 18 of the present invention is provided at the lower end of the inner cylinder 6 of the steam generator.
And the can body 1.

As shown in FIG. 2, the fine particle removing device 18 is provided at the upper end of an outer cylinder 19 smaller than the inner diameter of the can body 1.
A first baffle plate 20 having a diameter equal to the inner diameter of the can body 1 and having gaps formed in some places with the can body 1, a second baffle plate 21 and a third baffle plate 22 below the first baffle plate fixed to the outer cylinder 19. Are sequentially connected. Each of the baffles 20, 21, 22 is formed in a ring shape with holes 23, 24, 25 for fitting the inner cylinder 6 therein. On the first and second baffle plates 20 and 21, a plurality of flow guide pieces 26 and 27 inclined in the same direction are formed by hitting in the same direction. After launching these guide pieces, the square holes 28,
29 are formed. Instead of raising and forming the flow guiding piece 27 in this manner, circular holes are formed in the first and second baffle plates 20 and 21 and the plate pieces are inclined and welded to the upper side of the holes. Streams and holes can also be formed. The third baffle plate 22 has a plurality of circular holes 3 immediately below the holes 29 of the second baffle plate 21.
Drill 0. A plurality of small holes 31 are formed in an upper end portion of the outer cylinder 19 immediately below the first baffle plate 20 of the outer cylinder 19. Reference numeral 32 denotes a tongue piece formed by hanging the outer end of the baffle plate 20 to stabilize the fitting when the first baffle plate 20 is fitted inside the can body 1. Fine particle removing device 1 configured as above
8, at the lower end of the inner cylinder 6 as shown in FIGS.
It is fitted between the inner cylinder 6 and the can body 1.

Next, the action of the steam generator to which the particle removing device is attached will be described with reference to FIG. The steam generated in the heat transfer tube 4 by being heated by the heating steam in the inner cylinder 6 squirts into the lower part of the can body 1 and reverses and rises between the inner cylinder 6 and the outer cylinder 19 at a speed V ₀ . I do. The rising steam first strikes the third baffle plate 22 and rises through the circular hole 30. Next, this rising steam flow is applied to the second baffle plate 21.
Collides with the flow guide piece 27 through the hole 29, and changes its direction to a direction inclined by an angle α with respect to the horizontal, and flows. At this time, since the steam flow passing through the hole 29 is throttled by the hole and has a velocity V ₁ larger than V _{0, the} spiral flow generated by the plurality of flow guide pieces 26 is faster than the conventional cyclone. The effect of removing fine particles can be enhanced. The fine particles separated by centrifugal force from the high-speed spiral flow rise along the inner surface of the outer cylinder 19, come out of the outer cylinder through the small holes 31 at the upper end of the outer cylinder, and move between the outer surface of the outer cylinder 19 and the can body 1. It descends through the passage of the gap with the inner surface and falls on the seat plate 7. Unevaporated water and fine particles accumulated on the seat plate 7 are discharged from the drain port 12 in a timely manner. Most of the fine particles are removed by the cyclone formed between the inner cylinder 6 and the outer cylinder 19, but the vapor containing a small amount of residual fine particles passes through the hole 28 of the first baffle plate 20 and flows to the flow guide piece 26. It is guided and spirally flows between the can body 1 and the inner cylinder 6 in a direction inclined by the angle θ and rises. The vertical minute speed of the steam hole 28 is V ₁ sin θ, and the steam of the speed V ₁ rises over time while rotating along the inner cylinder 6, so that the fine particles not removed by the cyclone are used. Is settled not far from the first baffle 20, descends onto the seat plate 7 from the gap between the can body 1 and the first baffle 20, and is discharged from the drain port 12.

The steam from which the fine particles have been removed as described above rises through the holes 28 of the first baffle plate 20, and is sent from the generated steam outlet 11 to the next-stage steam generator as heating steam. Alternatively, it is directly sent to a condenser to be distilled water. Table 1 shows the test results of the removal of insoluble fine particles contained in the raw water and the produced distilled water, and shows the number and the removal rate of the raw water and produced distilled water of each particle size group.

[0018]

[Table 1]

[0019]

【The invention's effect】

(1) As seen in the above embodiment, the particle removing device according to the present invention mounts a flow guide piece and an annular baffle plate having a through hole in an outer cylinder, so that a conventional cyclone is spirally wound. It is easier to manufacture and assemble into a steam generator, and can be manufactured at lower cost, compared to manufacturing with wings.

(2) Since the steam flow is squeezed out by the baffle plate having the through-hole, the steam flow is increased to increase the flow rate of the spiral flow generated by the flow guide piece, thereby enhancing the effect of separating fine particles by centrifugal force. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing a mounting position of a particle removing device to a steam generator.

FIG. 2 is a partially cutaway perspective view of the particle removing device.

FIG. 3 is a schematic vertical sectional view of a particle removing device.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is an enlarged sectional view taken along the line CC of FIG. 4;

FIG. 6 is a schematic longitudinal sectional view of a conventional steam generator.

FIG. 7 is a sectional view taken along the line AA of FIG. 6;

FIG. 8 is a partially cutaway perspective view illustrating a particle removing apparatus using a cyclone method.

[Explanation of symbols]

 Reference Signs List 1 can body 2 partition plate 3 top plate 4 heat transfer tube 6 inner tube 6a flange 6b end plate 7 bottom plate 8 discharge tube 9 raw water supply port 10 heating steam supply port 11 generated steam outlet 12 drain port 14 intermediate cylinder 15 spiral blade 16 small Hole 18 Particle removing device 19 Outer cylinder 20 First baffle plate 21 Second baffle plate 22 Third baffle plate 23, 24, 25 Holes 26, 27 Flow guide pieces 28, 29, 30 Hole 31 Small hole 32 Tongue piece

Claims (2)

[Claims] 1. An outer cylinder is interposed in a generated steam passage between a can body of a steam generator for producing pure steam and distilled water and an inner cylinder having a built-in heat transfer tube and flowing heating steam. The baffle provided with a through hole between the cylinder and the inner cylinder and the baffle provided with the through hole and the flow guide piece are closed with a baffle at the top between the outer cylinder and the can body leaving a small gap. The generated steam flow is passed through the hole to increase the speed and separate the fine particles by centrifugal force as a spiral flow, and the separated fine particles are separated from the outer cylinder and the can body through the small hole at the upper part of the outer cylinder. The cyclone to be discharged into the gap is formed between the inner cylinder and the outer cylinder, and the uppermost baffle plate discharges the vapor flow obliquely upward with the flow guide pieces to separate and sediment the remaining fine particles due to the difference in specific gravity. Characteristic particle removal equipment for steam generator for producing pure steam and distilled water. 2. A first baffle plate having a diameter equal to that of the can body is attached to an upper end of an outer cylinder smaller in diameter than the can body of the steam generator, and a second baffle plate and a third baffle fitted inside the outer cylinder below the first baffle plate. A baffle plate is fitted inside the outer cylinder and attached.A plurality of through holes are formed in each baffle plate, and the steam flow passing through these through holes is directed diagonally upward in the same direction on the upper baffle plate. A steam generator for producing pure steam and distilled water, which is mounted between the can body and the lower part of the inner tube of the steam generator, having a small hole formed in the outer tube below the first baffle plate. Particle removal device.