JPS6048203B2 - Evaporator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plate-type evaporator that vaporizes various process fluids using heated fluid such as heated steam.

Conventional plate-type evaporators of this type are constructed by stacking a large number of square plates and allowing heated steam and process fluid to flow alternately into the spaces formed between the square plates.
The process fluid is thermally affected by the condensate of the heated steam that heated the process fluid, resulting in a decrease in efficiency.In addition, the process fluid is susceptible to distortion due to thermal stress, and the pressure difference between the heated steam and the process fluid causes the flat plate to There was a problem that it was easy to bend.

The present invention has been completed with the aim of providing an evaporator that solves the above-mentioned problems.Hereinafter, the present invention will be described in detail with reference to the drawings. 1 is a heat transfer plate, and the heat transfer plate 1 has an upper plate part 3a having a large number of wavy or other arbitrary convex parts 2 and a lower plate part 3b having a large number of radial or other arbitrary convex parts 2. A center hole 5 of a donut-shaped plate 3 made of a thin metal plate, which is integrally joined at the periphery and has a hollow part 4 inside for heating fluid circulation, has a central passage 6 for supplying process fluid and for passing the main shaft through, and a heating passage. A boss 9 having a fluid passage 7 and a drain discharge passage 8 is fitted into the hollow part 4.
is a donut-shaped partition plate 11 with a large number of drain holes 10 arranged therein.
It is divided into an upper chamber part 5a and a lower chamber part 5b.

Reference numeral 12 denotes a donut-shaped heat insulating plate, and the heat transfer plate 1 has a large number of heat transfer plates stacked one on top of the other with the heat insulating plate 12 interposed between them, and a main shaft 13 inserted into each center passage 6 and screwed thereto. The upper and lower clamping members 14 are connected to each other.

Further, the heated fluid passage 7 of each boss 9 communicates with the upper chamber part 5a, which is the upper part of the hollow part 4, through a communication hole 15, and in order to discharge the condensate produced by condensing the heated steam, the hollow part The lower chamber part 5b corresponding to the lower part of 4 is the communication hole 1.
6 communicates with the drain discharge passage 8 of the boss 9 gate, and on the other hand,
The central passage 6 of the boss 9 communicates with the space above the upper plate part 3a, that is, the gap 17 between the upper plate part 3a and the heat insulating plate 12, through a communication hole 18. Note that gasket grooves 19 are provided on both upper and lower surfaces of this boss 9, into which gaskets 20 are fitted for airtightly connecting the upper and lower adjacent bosses 9, and the heat transfer plates 1 are stacked as described above. The above-mentioned upper and lower tightening members 1 are attached to the upper and lower ends via the end plates 21 and 22.
4 and housed in a container 23 such as a tank. Note that 24 is an arcuate rectifying member provided on the upper surface of the partition plate 11 so that the heated fluid is uniformly diffused over the entire heat transfer plate 1. Configured like this,
When a process fluid is supplied to the process fluid supply center passage 6 of the boss 9 and a heating fluid is supplied to the heating fluid passage 7 of the boss 9, the process fluid flows upward from the communication hole 18 as shown in FIG. It enters the gap 17 between the plate portion 3a and the heat insulating plate 12, passes between the convex portions 2 of the upper plate portion 3a, and gradually flows outward.

On the other hand, as shown in FIG. 2, the heated fluid enters the upper chamber 5a between the upper plate 3a and the partition plate 11 through the communication hole 15, and gradually flows outward, and the heated fluid enters the upper chamber 5a between the upper plate 3a and the partition plate 11, and gradually flows outward. The process fluid is efficiently heated through the upper plate portion 3a. At this time, the heating fluid is uniformly diffused over the entire heat transfer plate 1 by the arc-shaped rectifying member 24 provided on the upper surface of the partition plate 11. In this way, the heated steam that heated the process fluid gradually generates condensate, which flows into the lower chamber 5b from the drain hole 1 of the partition plate 11 and flows through the communication hole 16.
mosquito. In addition, since the heat transfer plates 1 and 1 are provided with heat insulating plates 12, the condensed liquid in the heat transfer plates does not flow into the other heat transfer plates 1. It is less likely to cause thermal effects and reduce efficiency. In addition, heat transfer plate 1
The heated steam has reached the end of the! The liquid also flows into the lower chamber part 5b from the end of the partition plate 11, flows into the drain discharge passage 8 in the boss 9 through the communication hole 16 together with the condensed liquid, and is discharged to the outside. In this way, the process fluid flows through the upper plate portion 3a with the convex portion 2.
It is gradually heated at the top, gradually vaporizes, becomes a gas-liquid multiphase flow 5, and advances in the gap 17 between the upper plate portion 3a and the lower heat insulating plate 12 of the other heat transfer plate 1. Since this gap 17 forms a complicated flow path due to the convex portion 2 on the surface of the upper plate portion 3a, the flow of the process fluid is sufficiently disturbed and a large film heat transfer coefficient can be obtained. The process fluid that has reached the end of the upper plate part 3a while being sufficiently heated in this manner is separated into gas and liquid into vaporized low-boiling substances and non-vaporized high-boiling substances, and is separated into a container 2.
However, in the present invention, since the heat transfer plate 1 is formed in a donut shape, there is an advantage that distortion due to heat is reduced. A large number of convex portions 2 are arranged on each heat transfer plate 1.
, 1 is interposed between the heat insulating plates 12 and the protrusions 2 are in contact with the plates at multiple points, so even if the thin metal plates are made thinner to improve heat transfer, deformation due to heating steam pressure etc. will not occur. This eliminates the possibility of this occurring, and together with the fact that the heat transfer area of the upper plate portion 3a is expanded by the convex portion 2, excellent thermal efficiency can be obtained. If a partition plate 11 having a large number of drain holes 10 is used to divide the upper chamber 5a and the lower chamber 5b, the condensed liquid can be quickly discharged through the drain holes 10. There is no risk that the heat transfer effect will be adversely affected. Furthermore, according to the present invention, the influence of the condensate is reduced by the heat insulating plates 12 disposed above and below the heat transfer plate 1.
Since the heating fluid passage 7 and the drain discharge passage 8 are provided in the boss together with the central passage 6 for supplying the process fluid, there is no adverse thermal effect on the process fluid. Each heat transfer plate 1 can be created by simply stacking the plates 1
Another advantage is that the passages can be made to communicate with each other, making disassembly and assembly easy. Therefore, the present invention greatly contributes to the development of the industry as it solves the problems of the conventional plate type evaporator.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing an embodiment of the present invention, Fig. 2 is a partially cutaway front view of the main part, Fig. 3 is a partially cutaway side view of the main part, and Fig. 4 is the same. FIG. 3 is a partially cutaway plan view. DESCRIPTION OF SYMBOLS 1...Heat transfer plate, 2...Convex part, 3...Doughnut-shaped board material, 3a...Top plate part, 4...Hollow part, 5...Central hole part, 5a...・Upper chamber part, 5b...Lower chamber part, 6...
- Center passage, 7... Heating fluid passage, 8... Drain discharge passage, 9... Boss, 10... Drain hole, 11...
...Partition plate, 12...Insulation plate, 13...Main shaft, 14.
...Tightening member, 15, 16...Communication hole, 17...Gap, 18...Communication hole.

Claims (1)

[Scope of Claims] 1. A large number of convex portions 2 are arranged on the upper plate portion 3a of a donut-shaped plate material 3 made of a thin metal plate with a hollow portion 4 for circulating heated fluid, and a central hole portion 5 is provided with a plurality of convex portions 2. A large number of heat transfer plates 1 each having bosses 9 fitted therein having a central passage 6, a heated fluid passage 7, and a drain discharge passage 8 are stacked and inserted into each central passage 6 with heat insulating plates 12 interposed between them. The main shaft 13 is connected to the main shaft 13 by upper and lower tightening members 14 screwed thereon, and the central passage 6 is communicated with the gap 17 between the upper plate portion 3a and the heat insulating plate 12 through a communication hole 18. An evaporator characterized in that the heated fluid passage 7 and the drain discharge passage 8 are communicated with each other through communication holes 15 and 16 in the upper and lower parts of the hollow part 4. 2 Hollow part 4 of donut-shaped board material 3 has many drain holes 10
The evaporator according to claim 1, wherein the evaporator is divided into an upper chamber portion 5a and a lower chamber portion 5b by a partition plate 11 having a partition plate 11 arranged thereon.