JPS5969101A - Evaporator - Google Patents

Abstract

PURPOSE:To decrease the strain of a heat transmission plate by the effect of heat by forming said plate wherein flow passages for a process fluid and a heating fluid are constituted of upper and lower plate parts disposed with many projecting parts as well as a heat insulation plate and a partition plate into a doughnut shape. CONSTITUTION:A process fluid is supplied to the central passage of a boss 9, and is introduced through a communicating hole 18 into the gap 17 between an upper plate part 3a and a heat insulation plate 12, and is flowed through the spacing between the projecting parts 2 of the upper plate part 3a toward the outside. On the other hand, a heating fluid is supplied to the passage 7 of a boss 9 and is introduced through a communicating hole 15 into the upper chamber part 5a between the upper plate part 3a and a partition plate 11 and is flowed gradually outward so that the process fluid is efficiently heated through the upper plate part 3a provided with projecting parts consisting of a thin metallic sheet. The condensed liquid of the heating fluid flows through the drain hole of the plate 11 to the lower chamber part 5b, from which the fluid is discharged through a communicating hole 16 to a discharging passage 8. The process fluid evaporates gradually and advances in the gap between the upper plate part 3a and a heat insulation plate 12, whereby the gas-liquid sepn. is accomplished. Since this heat transmission plate 1 is formed into a doughnut shape, the strain by the effect of heat is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plate-type evaporator for vaporizing a process fluid.

Conventional flate-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 flat plate is easily bent due to the pressure difference between the heated steam and the process fluid. There was a problem.

The present invention has been completed with the aim of providing an evaporator that solves the above-mentioned problems.The present invention will be described in detail below with reference to the illustrated embodiments. The heat transfer plate (1) has a corrugated or other shape, and the inside is formed with a hollow part (4) for the flow of heated fluid. Center passage (6) and heated fluid passage (7) for both supply and spindle insertion
The hollow part (4) has a donut-shaped partition plate 0υ provided with a large number of drain holes 00, and the upper chamber part (j , a) and the royal area ab>.

(6) is a donut-shaped heat insulating plate, and the heat transfer plate (1
) are stacked one on top of the other with the heat insulating plates @ interposed between them, and are connected by a main @ (13) inserted into each center passage (6) and upper and lower tightening members α4 screwed thereto. In addition, the heated fluid passage (7) of each boss (9) communicates with the upper chamber part σa) corresponding to the upper part of the hollow part (4) through a communication hole, and the condensation produced by condensing this heated steam. In order to drain the liquid, the royal part (5-b), which is the lower part of the hollow part (4), is communicated with the drain discharge passage (8) of the boss (9) through the communication hole QQ. The center passageway (6) is the space above the upper plate part (3a), that is, the upper plate part (j
The communication hole 0 is in communication with the gap a71 between the a) and the heat insulating plate 02). In addition, gasket grooves Q are provided on both the upper and lower surfaces of this boss (9) to fit gasket blades for airtightly connecting the upper and lower adjacent bosses (9). The boards (1) are stacked as described above and connected at the upper and lower ends with the end plates ψυ and (a) at the angle of the upper and lower clamping members α, and are used for containers such as tanks (
c) It shall be housed within. In addition, (c) is an arc-shaped rectifying member provided on the top surface of the partition plate (1υ) so that the heated fluid is uniformly diffused over the entire heat transfer plate (1). When the process fluid is supplied to the central passage (6) for supplying the process fluid of the boss (9) and the heated fluid is supplied to the heating fluid passage (7) of the boss (9), the process fluid becomes as shown in FIG. Gap Q between the upper plate part (3a) and the heat insulating plate (2) from the communication hole (G) so that
It penetrates into η, threads between the convex portions (2) of the upper plate portion (3), and gradually flows outward. On the other hand, as shown in FIG. 2, the heating fluid flows from the communication hole 0Q to the upper chamber part C! between the upper plate part (3a) and the partition plate αυ. a) and gradually flows outward, efficiently heating the process fluid through the upper plate part (3a) with the protrusion (2) made of a thin metal plate. At this time, the heating fluid is uniformly diffused over the entire heat transfer plate (1) by the arc-shaped rectifying member (c) provided on the upper surface of the partition plate 0→. The steam gradually generates condensate, which flows from the drain hole 00 of the partition plate 0υ to the lower royal part C3b) and through the communication hole αQ.
Since the condensed liquid in the heat transfer plates is quickly discharged from the drain to the drain discharge path (8), and since there is a heat insulating plate (2) interposed between each heat transfer plate (1), the condensate in the heat transfer plate is is another heat transfer plate (1
) is less likely to have a thermal effect and reduce efficiency. In addition, the heated steam that has reached the end of the heat transfer plate (1) also flows from the end of the partition plate αυ into the lower chamber part eb), and flows along with the condensate from the communication hole αQ to the drain discharge path in the boss (9). (8
) and is discharged to the outside. In this way, the process fluid is gradually heated on the upper plate part (Ja) with the convex part (2), and the air is gradually heated up. Since the flow path is rough, the process fluid flow is sufficiently disturbed to obtain a large film heat transfer coefficient. In this way, the process fluid that reaches the end of the upper plate part (3a) while being sufficiently heated is separated into gas and liquid into vaporized low-boiling substances and non-vaporized high-boiling substances, and is then transferred to a container)
However, in the present invention, the heat transfer plate (1) is formed in a donut shape, which has the advantage of reducing distortion due to heat.
A large number of convex portions (2) are arranged on the upper plate portion (3a) of the heat transfer plate (1), and a heat insulating plate (6) is interposed between each heat transfer plate (1). Because there is multi-point contact with two pins,
Even if the thin metal plate is made thinner to improve heat transfer, there is no risk of deformation due to heating steam pressure, etc., and the upper plate part (
Combined with the fact that 3a) expands the heat transfer area by the convex part (2), it is possible to obtain excellent thermal efficiency. 00 is arranged, the upper chamber part (5B) and the lower chamber part (5B)
-b), the condensed liquid will be quickly discharged through this drain hole Q1, and there is no possibility that it will adversely affect the heat transfer effect. Furthermore, according to the present invention, the influence of condensate can be reduced by the heat insulating plates placed above and below the heat transfer plate (1).
Moreover, 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. Therefore, there is an advantage that the passages of each heat transfer plate (1) can be made to communicate with each other by simply stacking the heat transfer plates (1), and disassembly and assembly can be easily performed.
The present invention greatly contributes to the development of the industry as it solves the problems of conventional plate type evaporators.

[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. 3 is the same. FIG. 3 is a partially cutaway plan view. (1): Heat transfer plate, (2): Convex portion, (3): Donut-shaped plate material, (3B): Upper plate portion, (4): Hollow portion, (5):
Central hole, (5-8) Upper chamber, 0b): Lower chamber, (6
) Two central passages % (7) Two heating fluid passages, (8): Drain discharge passage, (9): Boss, 00: Drain hole, aυ: Partition plate,
(2): Heat insulating board, 0 hesitation: Main shaft, αIO: Tightening member, αQ
1αQ: communication hole, 0η: void, θ8): communication hole.

Claims (1)

[Claims] / Upper plate portion (3a) of a donut-shaped plate material (3) made of a thin metal plate having a hollow portion (4) for circulating heated fluid inside.
A large number of convex portions (2) are arranged in the central hole portion (5).
A heat transfer plate (1) is formed by fitting a boss (9) having a center passage (6), a heating fluid passage (7), and a drain discharge passage (8) to the
) are stacked one on top of the other with heat insulating plates (b) interposed between them, and connected by the main shaft α■ inserted into each center passage (6) and the upper and lower tightening members Q→ screwed thereon. The center passage (
6) is connected to the gap α between the upper plate part (3a) and the heat insulating plate (6) through a communication hole Qsha, and the heating fluid passage (7) and the drain discharge passage (8) are connected to the hollow part (4). ) The upper part and the lower part of the evaporator are connected through communication holes (15, Qf19). Claim 1 is divided into an upper chamber part (ta) and a lower chamber part (5-b) by a partition plate αη.
Evaporator as described in section.