JPH0118161Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a falling film type evaporator.

Structure of the conventional example and its problems The heat transfer elements of the conventional falling film type evaporator include a flat hollow heating element, an internal falling film type vertical tube element, etc. However, with flat hollow heating elements, there is a problem that the pressure resistance is low due to the thin plate structure, and furthermore, the flat shape does not allow for complicated arrays, and the casing that encloses the elements becomes large. There was a problem.
Further, in the case of the vertical tube element of the internal falling liquid film type, there was a problem in that when an evaporation operation or the like was performed in each tube, it was difficult to remove the scale deposited on the inner circumferential surface of the tube.

OBJECT OF THE INVENTION The object of the present invention is to provide a falling film type evaporator that overcomes the above-mentioned conventional drawbacks.

Structure of the Invention In order to achieve the above object, the falling film type evaporator of the present invention arranges a plurality of tubes close to each other, and connects the sides of each tube directly or through a plate or a bar, This constitutes a plate-shaped tube group, and this plate-shaped tube group is arranged in a housing with its tube axis positioned in the vertical direction, and each tube of the plate-shaped tube group is placed above the plate-shaped tube group. A liquid supply device is provided to supply liquid to be evaporated on the outer peripheral surface in the form of a liquid film, a concentrated liquid discharge device is provided at the bottom of the housing to guide the concentrated liquid to the outside, and a plate is provided at the upper end of the plate-like tube group. A heated fluid supply device for supplying heated fluid into each tube of the plate-shaped tube group is provided, and a heated fluid discharge is provided at the lower end of the plate-shaped tube group to guide the heated fluid supplied into each tube by the heated fluid supply device to the outside. The structure is such that a steam exhaust device is installed at an appropriate place in the casing to guide the steam generated inside the casing to the outside.This makes it possible to maintain high pressure resistance and reduce the size of the casing. It can be made compact and the scale can be easily removed.

Embodiment and Operation An embodiment of the present invention will be described below based on the drawings.

FIG. 1 shows a first embodiment of the invention. In the figure, reference numeral 1 denotes a group of plate-shaped tubes, in which a plurality of tubes 2 whose upper ends are bent laterally are arranged close to each other as shown in FIG. It is constructed by connecting. Note that the side surfaces of each tube 2 may be connected via a plate 3 (FIG. 2B) or a bar 4 (FIG. 2C). The plate-shaped tube group 1 is disposed within the housing 5 with its tube axis vertically positioned. Reference numeral 6 denotes a liquid supply device provided above the plate-like tube group 1, and is provided with a suitable gap between a liquid supply pipe 7 penetrating through the housing 5 and a portion of the liquid supply pipe 7 inside the housing 5. It has a plurality of nozzles 8 and functions to supply a liquid film-like liquid 9 to be evaporated on the outer peripheral surface of each tube 2 of the plate-shaped tube group 1. 1
0 is a concentrate discharge device provided at the bottom of the housing 5,
It has a liquid discharge pipe 11 connected to the bottom of the housing 5 and a pump 12 interposed in the middle of the liquid discharge pipe 11, and guides the concentrated liquid 13 accumulated at the bottom of the housing 5 to the outside. It is something that does work. Note that the liquid supply pipe 7 of the liquid supply device 6 and the liquid discharge pipe 1 of the concentrated liquid discharge device 10
A connecting pipe for circulating and supplying the concentrated liquid 13 to the liquid supply pipe 7 may be provided between the liquid supply pipe 1 and the liquid supply pipe 7 . 14 is a heating fluid supply device connected to the upper end of the plate-like tube group 1;
It has a steam header 15 that penetrates the housing 5 and is connected to the upper end of each tube 2 of the plate-like tube group 1, and a compressor 16 that is connected to this steam header 15. It functions to supply. Reference numeral 17 denotes a heated fluid discharge device connected to the lower end of the plate-like tube group 1, which includes a steam drain header 1 that passes through the housing 5 and is connected to the lower end of each tube 2 of the plate-like tube group 1.
8 and a condensate collection tank 19 connected to this steam drain header 18, and serves to guide the steam supplied into each pipe 2 to the outside. 2
0 is a steam exhaust device provided on the side of the housing 5,
It has a steam exhaust pipe 21 connected to the side part of the housing 5,
It serves to guide the steam 22 generated within the casing 5 to the outside. Note that the steam exhaust pipe 21 may be connected to the compressor 16 of the heating fluid supply device 14, and the extracted steam 22 may be used as the heating fluid.

Hereinafter, the effects of the above configuration will be explained. Each tube 2 of the plate tube group 1 is heated by the heating fluid supply device 14.
At the same time, the liquid supply device 6 supplies the liquid 9 to be evaporated onto the outer peripheral surface of each tube 2 of the plate-shaped tube group 1 in the form of a liquid film. The current will be rectified. That is, the bent portion at the upper end of each tube 2 functions as a descending run-up section for the liquid 9, and the liquid film is kept uniform in this portion. And liquid 9
descends through each tube 2 and partially evaporates. In this case, as shown in FIG. 3, when the tubes 2 and the side surfaces of the tubes 2 are connected via a short bar (round bar) 4, a fin effect can be obtained with the bar 4, and The liquid 9 also flows into the gaps between the rods 4, which is extremely good. Further, as shown in FIG. 4, if a flute tube 23 is employed, the heat transfer efficiency can be further increased.

FIG. 5 shows a second embodiment. In this example, the first
The bent portion at the upper end of each tube 2 of the plate tube group 1 in the embodiment is eliminated, and the configuration of the steam header 15 of the heating fluid supply device 14 is changed, but the other configurations are the same as in the first embodiment. That is, it is constructed by using a plurality of steam headers 15 and assembling them in a cross-shaped structure, and the plate material 3 is provided between each steam header 15, as shown in the cross section of FIG. Even with such a configuration, a descending run-up section for the liquid 9 can be obtained, and the liquid 9 can be rectified.

7 and 8 show examples of the arrangement of the tubes 2 of the plate-like tube group 1, and a perforated plate 3 is connected between the sides of each tube 2.
It is connected via. As is clear from the figure, the tubes 2 can be arranged in various shapes, and the space 24 between them and the housing 5 can be minimized.
In addition, if a perforated plate material 3 is used, the generated steam 22
can promote the discharge of

In the above embodiment, the heating fluid flows in the same direction as the liquid 9, but the heating fluid may flow from the bottom to the top, facing the liquid 9.

Effects of the invention As described above, according to the invention, since a plate-shaped tube group is constructed using a plurality of tubes, it is possible to maintain high pressure resistance, and the size of the housing can be made compact, and the scale can also be reduced. Can be easily dropped.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG.
The longitudinal sectional front view of the falling film type evaporator in the embodiment, Figure 2 A, B, and C are respectively A- in Figure 1.
A sectional view, FIG. 3 is an enlarged view of the main part, FIG. 4 is a sectional view of the tube, FIG. 5 is a longitudinal sectional front view of the falling film type evaporator in the second embodiment, and FIG. 6 is B of FIG. −
B cross-sectional view, FIG. 7, and FIG. 8 are cross-sectional views showing arrangement examples, respectively. 1...Plate tube group, 2...Pipe, 3...Plate material, 4...
... Bar material, 5 ... Housing, 6 ... Liquid supply device, 9 ...
Liquid, 10... Concentrate discharge device, 13... Concentrate, 14... Heated fluid supply device, 17... Heated fluid discharge device, 20... Steam discharge device, 22... Steam.

Claims (1)

[Scope of utility model registration request] A plurality of tubes are arranged close to each other and the sides of each tube are connected directly or through a plate or bar to form a plate-shaped tube group, and the plate-shaped tube group is installed inside the housing. A liquid supply device is disposed with the tube axis positioned in the vertical direction, and a liquid supply device is provided above the plate-shaped tube group for supplying liquid to be evaporated on the outer circumferential surface of each tube of the plate-shaped tube group in the form of a liquid film. A concentrated liquid discharge device for guiding the concentrated liquid to the outside is provided at the bottom of the housing, a heated fluid supply device is provided at the upper end of the plate-like tube group for supplying heated fluid into each tube of the plate-like tube group, and the A heated fluid discharge device is provided at the lower end of the plate-like tube group to guide the heated fluid supplied into each tube by the heated fluid supply device to the outside, and a heated fluid discharge device is provided at an appropriate location of the casing to discharge the steam generated inside the casing to the outside. A falling film type evaporator characterized by being equipped with a steam exhaust device that guides the steam.