JPS6274402A - Drainage device for centrifugal thin film evaporator - Google Patents

Abstract

PURPOSE:To prevent the inlet and outlet tubes from accidental contact with the jacket and the evaporator by fixing the condenser tube inside the rotatable jacket located outside the evaporator and sucking out drain and non-condensed gas out of the tip of a condenser tube. CONSTITUTION:The inlet tube 18 and outlet tube 19 integrated with the jacket 3 an the evaporator 4 are rotated to supply liquid to be treated from the supply tube 5 into the evaporator 4 and also supply vapor from the axis of rotation 2 into the space 8. The condensed drain inside the space 8 is accumulated in the junction area of the evaporator 4 with the jacket 3 by the work of centrifugal force. When vapor is supplied from the inlet 18, drain, non-condensed gas and the like form up a gas-liquid mixed flow which is sucked by the suck-in action created in the ejector 20 into the outlet tube 19 to be drained out into the seal box 17. Drain, non-condensed gas and the like are drained out of the system through the drainage tube 7 together with vapor.

Description

[Detailed description of the invention] 3. Description of the invention only Tl 1111 [Field of industrial application] The present invention [,L, Centrifugal type using steam as a heat source,! 9
It is related to the Ijl output device of the drain.

[Conventional technique (+11 Centrifugal thin 1!! ltX light machine 13λ) A thin film of the liquid to be treated is created on the evaporation surface by using the centrifugal force generated by the rotation of the surface, and the evaporation surface is covered with water vapor (hereinafter abbreviated as steam). Heat the liquid to be treated
ll1iu.

Conventionally, condensate condensed into water was discharged by inserting a stationary, non-rotating pipe into the steam chamber formed on the back of the evaporation surface, i.e. the largest diameter part of the giseget, and rotating it using centrifugal force. Fifty-one people were employed to collide the condensate with the condensate and discharge it from the center of rotation of C1 or near it. Fig. 5 shows the conventional condensate discharge device according to the above method. I will explain.

A hollow rotating shaft 2 that penetrates the container 1 and is rotatably supported.
A jacket 3 is attached to the tip of the jacket 3, and an evaporator 4 is attached to the jacket 3, leaving a required space 8 between it and the jacket 1. C
The evaporator 4 rotates and rolls over. The jacket 1 and the steamer 4 are fitted with reinforcing metal fittings
4 to support the C phase L7.

Wave speed 11! The liquid is supplied from the supply pipe 5 to the minimum iY position of the evaporator 1, and the concentrated liquid is discharged from the maximum iY position of the evaporator 4 through the discharge pipe 6.

A drain pipe 7 for discharging drain passes through the rotary shaft 2 and reaches the space 8, and opens at the maximum diameter position of the space, and the drain pipe 7 is fixedly supported against the rotation of the jacket 3. I'm here.

In the apparatus described in item 9, the liquid to be treated supplied from the supply pipe 5 forms a thin film on its inner surface by the rotation of the evaporator 4, and is further heated by the steam supplied from the rotating shaft 2 to the space 8, causing it to shrink. be done. The concentrated liquid is discharged from the concentrated liquid discharge pipe 6, and the steam generated during concentration is discharged from the steam JJI outlet 9.

The heated steam condenses to become drain, which is rotated by the jacket 3 and comes into contact with the drain port end and is discharged from the C drain pipe 7.

Further, FIG. 6 shows another example, in which the evaporator 4 is attached to the rotating shaft 10 of the 101a, and a stationary hollow tube 11 provided concentrically with the rotating shaft 10 is connected to the jacket 3. The space between them is sealed by a double mechanical seal 12.

The drain pipe 7 is inserted between the evaporator 4 and the jacket 3, and is fixedly supported on the hollow pipe 11 by a stopper 13.

When the rotating shaft 10 is rotated, the evaporator 4 and jacket 3 are rotated and drain is discharged from the drain pipe 7, as in the conventional example.

[Problems to be Solved by the Invention] Among the conventional examples described above, in the one shown in FIG. Then it's not acceptable. For this reason, the drain pipe 7 is quite long despite its small diameter, and furthermore, its tip collides with the drain rotating together with the jacket 3, and is subjected to a considerable load. Therefore, the drain pipe 7 moves and often comes into contact with surrounding rotating parts, causing accidents.

In order to prevent such an accident from occurring, in the case shown in FIG. 5, the tip of the drain pipe 7 is located in a relatively wide space, the space formed by the bottom of the evaporator 4 and the bottom of the jacket 3.

However, there are small mountains of non-condensable gas in the heat source steam,
This has a major disadvantage in that it gradually accumulates between the evaporator side and the jacket side, lowering the partial pressure of steam and significantly lowering the overall heat transfer coefficient.

Fig. 6 shows a system in which condensate and non-condensable gas are handled together in consideration of the above drawbacks.

In the case shown in FIG. 6C, the jacket 3, which is a rotating part, and the hollow tube 11, which is a stationary part, are separated, and the drain pipe 7 can be fixed with a fastener 13 or the like in the vicinity of the jacket 3. Wear. Therefore, the drain pipe 7 can be inserted up to the tip of the jacket 3, and the drain and non-condensable gas can be handled together.

However, with such a structure, it is not possible to provide the reinforcing metal fitting 14 between the evaporator 4 and the jacket L-3 shown in FIG.

Since the mR device 4 and the jacket 3 independently receive repulsive force and transmit rotational power together, a considerable amount of weight is required. In particular, the joint between the evaporator 4 and the jacket 3 is
It is a part that transmits power and also serves as a kind of fulcrum for the jacket, so it requires a fairly strong structure. Therefore, in the case shown in FIG. 6, a thick member is used, which not only increases the weight of the rotating part but also moves the center of gravity in an unfavorable direction. Furthermore, since the large-diameter double mechanical seal 12 is rotated from the rotary shaft 10 through the evaporator 4 through the dicerate 3, there is a drawback that vibrations are likely to occur, resulting in harsh operation.

In view of the above circumstances, it is an object of the present invention to provide a drain discharge device which can destroy the rotating part and discharge the drain and non-condensable gas inside the container.

[Means for Solving the Problems] The present invention includes an evaporator and a jacket provided on the outside of the evaporator that are rotatably housed in a container, and a hollow rotating shaft that also serves as a heated steam supply path is communicated with the jacket. The thin tube is fixed to the jacket, rotating shaft, etc. by aligning with the axis of the rotating shaft and positioning the tip at a predetermined position inside the Cytoget, and drain and non-condensable gas are sucked out from the tip of the thin tube. What are the characteristics?

[Effect J: The evaporator is heated by the steam supplied inside the jacket through the rotating shaft, and the steam is cooled to the IJ.] The condensed drain and the non-condensable gas contained in the steam are sucked from the tip of the thin tube and flow into the tube. Expelled outside.

[Implementation VA] The present invention will be described in detail below with reference to the drawings.

Components in FIG. 1 that are the same as those shown in FIG. 5 are given the same reference numerals.

A dicerate 3 is fixed to the tip of a hollow rotating shaft 2 that is rotatably installed in a container 1, and a required space is left in the jacket 3 to install an evaporator 4. The reinforcing metal fittings 14 are fixed between them.The jacket 3 is 'F7S
Like generator 4, it has a shape that widens toward the tip.

The rotating shaft 2 is rotatably connected to a steam box 15, and seals 16 are provided on both sides.

The steam box 15 is connected to a steam source (not shown), and has a seal box 17 formed therein, and the drain pipe 7 is communicated with the seal box 17.

A small-diameter drive fluid introduction pipe 18 is inserted through the seal box 17 and concentrically with the axis of the rotating shaft 10, and its tip is bent along the space 8 to connect the evaporator 4 and jacket 3.
be located near the joint. The inlet pipe 18 and one small-diameter drive fluid outflow pipe are connected via the ejector 20, and the one outflow pipe is molded along the space 8 and guided to the center of rotation @2, and the fluid inlet pipe 18 , and its tip is opened into the seal box 17 .

The inlet pipe 18 and the outlet pipe 19 are appropriately fixed to the evaporator 4, the jacket 3 and the rotating shaft 2 by means of support fittings 21,22. Further, a seal plate 23 is fixed to the lower end of the outflow pipe 19 to seal the opening of the seal box 17.

Note that the protruding part of the introduction pipe 18 (fixed) is connected with a double mechanical seal 24 between the rotating part and the stationary part of the introduction pipe 18. Also, the rotating shaft 2 is rotationally driven by a drive 1fJl device 25. There is.

Next, the ejector 20 will be explained with reference to FIG.

A nozzle 26 is formed by tapering the tip of the introduction tube 18, and a differential user 27 is formed at the base end of the outflow tube 19. The nozzle 21 and the differential user 27 are connected by a connecting vibrator 29 having a suction port 28, and a suction chamber 30 is formed inside the connecting pipe 29.

The operation will be explained below.

The fitting device 25 rotates the jacket 3 and the evaporator 4 through the rotation l1112, and also rotates the inlet pipe 18 and one outlet pipe integrated with these, and supplies the evaporator 4 from the supply pipe 5 to the evaporator 4.
The air is supplied to the C space 8 through the steam box 15 and the rotating shaft 2.
supply to. ? ll! ! The treatment solution is heated and concentrated 11 times.
It will be published by Idekan 6 in January.

Drainage condensed inside the space 8 accumulates at the joints between the evaporator 4 and the heaters 1 to 3 due to centrifugal force.

When a driving UJ fluid, for example steam, is fed from the inlet pipe 18, a suction action occurs in the ejector 20, and the drain, non-condensable gas, and a small amount of steam become a gas-liquid mixed flow and a two-phase flow. The driving fluid is sucked from the suction port 28, overcomes the centrifugal force of this drain and non-condensable gas, and passes through the outflow pipe 19 to the seal box 1.
Get 1 in 7.

Therefore, the drain and non-condensable gas are discharged out of the system through the drain pipe 7J into the driving fluid and equipment.

If gas (including steam) is used as the driving fluid for the ejector 20 as in the above example, a vigorous two-phase flow (for example, a spray flow) will flow in one outflow pipe and be discharged. If a liquid is used as the driving fluid for the ejector 20, the inside of the outflow pipe 19 will be discharged as a two-phase flow containing bubbles.

Next, operational data of the evaporator shown in FIG. 1 will be shown.

An experiment was carried out to evaporate water using water vapor as a heat source by constructing a 9-film evaporator with the structure shown in Figure 1 and having an evaporation area of about 0.2 m' and a cone with an apex angle of 5°.

For steam, use tap water directly in a small boiler? ↑The light is shining.

As the driving fluid for the cap, water vapor and drain were circulated by a pump for 6 hours each.

The evaporation temperature and water vapor temperature are respectively 6 II, ? The temperature was constant between 50°C and 90°C (below atmospheric pressure).

The average evaporation loss was 46 kg/hour, and no decrease in performance was observed during the 6-hour experiment period. The rotational speeds were b900r, p, and m.

These facts prove that the present invention is sufficiently effective in drain JJ+ discharge and noncondensable gas IW discharge.

Incidentally, the mounting position of the earthen cover 20 may be located outside the shutter 3 (see FIG. 3). Hit too, jacket 3
A suction pipe 31 may be connected to the suction pipe 31, and the earthen cover 20 may be connected to the suction pipe 31. Furthermore, the ejector 13L may be installed in a small amount.

In FIGS. 1 and 3, the ejector 20 is located at the maximum diameter part of the jacket 3. This is a convenient position for the drain to flow into the ejector 20 as well.

Alternatively, as shown in FIG. 4, the inlet pipe 18 and the outflow pipe 19 may be drawn as double-width pipes, and the non-condensable drain gas may be discharged directly to the outside of the system by lightening the seal box.

In FIG. 4, 32 is a stationary portion of one outflow pipe, and 33 is a double mechanical seal.

Furthermore, although not particularly shown, the inlet pipe is omitted and the outflow pipe 19 is
may be aligned with the axis of the rotating shaft 2, and a mechanism or the like may be provided inside the outflow pipe outside the system so that drain and non-condensable gas are constantly sucked through the outflow pipe in a state similar to a spray stream. .

[Effects of the Invention] As described above, the present invention exhibits the following excellent effects.

(+) Drainage and non-condensable gas can be reliably discharged.

(I) The inlet pipe and outflow pipe are fixed to the JAKELA 1-1 evaporator and rotate as one unit, so it is stable and accidents due to contact between the inlet pipe, outflow pipe, jacket, and evaporator do not occur.

(g) Since the jet 17 get and the evaporator can be mutually supported with reinforcing metal fittings or the like, it is possible to reduce the number of rotating parts to 111.

(c) The space between the evaporator and the evaporator can be made smaller because there is no separation between the evaporator and the evaporator, and the evaporator can be made smaller.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of one embodiment of the present invention, FIG. 2 is a sectional view of an example of an ejector used in the present invention, FIG. 3 is a partial view showing an example of ejector installation, The figure is a partial view showing another embodiment, and FIGS. 5 and 6 are schematic cross-sectional views of the conventional example. 11J container, 2 is the rotating shaft, 3 is the jacket, 4 is the evaporator, 7 is the drain pipe, 18 is the introduction pipe, 19 is the outflow pipe, and 20 is the machined lid. Patent applicant

Claims (1)

[Claims] 1) An evaporator and a jacket provided on the outside of the evaporator are rotatably housed in a container, and a hollow rotating shaft that also serves as a heating steam supply path is communicated with the jacket, and the jacket is aligned with the axis of the rotating shaft. Position the tip at the desired position inside the jacket and fix the thin tube to the jacket, rotating shaft, etc.
A drain discharge device for a centrifugal thin film evaporator, characterized in that drain and non-condensable gas are sucked out from the tip of the thin tube.