JP3287960B2 - Spiral heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spiral heat exchanger, and more particularly to a spiral heat exchanger used as a condenser directly installed on the top of a distillation column.

[0002]

2. Description of the Related Art A conventional example will be described with reference to FIG. Reference numeral 1 denotes a distillation column, on which a spiral heat exchanger 2 was installed. A spiral heat exchanger 2 is provided at the top of the distillation column, and a heat exchanger 3 for condensing steam from the distillation column 1 with water or another heat medium, and a heat exchanger 3 below the heat exchanger 3 from the distillation column 1. It comprises a cone 4 for guiding steam and an inlet 5 above the heat exchanger 3. The steam 6 is guided from the distillation column 1 to the cone portion 4, passes through the central portion 7 of the heat exchanger 3, enters the introduction portion 5, and from here enters one of the heat transfer surfaces (condensation surfaces). On the other hand, since water or other heat medium 8 flows through the passage, heat exchange is performed, the heat medium is collected inside the cone portion 4, and discharged from the drain outlet 9 to the outside of the system.

[0003]

However, in the above configuration, the volume of steam is very large, and when this large flow rate of steam is going to rise through the central portion 7 of the heat exchanger, the flow velocity becomes high, The pressure loss when passing through the center increases. Therefore, there has been a problem that the amount of passing steam is reduced and the performance as a condenser is reduced.

[0004] In order to reduce the flow velocity of the steam rising in the central portion of the heat exchanger, it is necessary to enlarge the central portion.
The whole equipment becomes large. In addition, when the size of the heat exchanger is increased, the diameter of the heat exchanger is inconsistent with the diameter of the distillation tower, so that it is difficult to install the heat exchanger. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and difficulties, and a spiral heat exchanger which can supply steam to an introduction portion without generating a high pressure loss, and which is easy to install with a compact heat exchanger. It is intended to provide.

[0005]

In order to achieve the above object, the present invention provides a heat exchanger provided at the top of a distillation column for condensing steam from the distillation column with water or another heat medium. And a feed section provided above the heat exchanger.The steam from the distillation column passes through the center of the heat exchanger from the cone section and transfers heat from the feed section. In a spiral heat exchanger that enters one passage of the surface, exchanges heat with the heat medium in the other passage, and discharges from a drain outlet, one or more bypasses that directly connect the steam rising part and the introduction part A spiral heat exchanger provided with tubes was used.

[0006]

According to the present invention, a steam rising section below the heat exchanger includes:
Since a bypass pipe is provided for directly connecting to the upper introduction section, the steam passing through the central portion of the heat exchanger is divided and also flows to the branched bypass pipe to be sent to the introduction section. When the steam passes through the central part of the heat exchanger, heat exchange by the heat medium hardly occurs, so that there is no influence on the heat exchange through the bypass pipe. One or a plurality of bypass pipes can be installed, and the diameter thereof is appropriately used according to the amount of steam.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Reference numerals 1 to 9 in the figure have the same configuration as the conventional example, and therefore, the description is omitted. Reference numeral 10 denotes a bypass pipe which directly connects the steam rising section and the introduction section 5. The central part 7 of the heat exchanger 3 can be designed to have a smaller diameter as compared with the conventional example, and a large amount of steam enters the introduction part 5 through the bypass pipe 10 branched together with the central part 7 and from there. The drain which is sent to the heat transfer surface and exchanges heat with the heat medium 8 and condensed is discharged from the drain outlet 9 to the outside of the system.

[0008] The diameter and the number of the bypass pipes 10
Is appropriately determined according to the amount of steam from Since almost no heat is exchanged while the steam 6 passes through the central portion 7 of the heat exchanger 3, even if the steam 6 is directly introduced into the introduction portion 5 via the bypass pipe 10 as described above. Has little effect. Therefore, installation is easy so as to match the existing distillation column, and a high pressure loss does not occur as compared with a conventional case where the amount of steam is large and the gas is forced to pass through the center as in the conventional example.

[0009]

According to the present invention, an appropriate diameter is provided according to the amount of steam supplied from the distillation column, and an appropriate number of bypass pipes are provided, so that it is not necessary to enlarge the central portion of the heat exchanger. , The overall size of the spiral heat exchanger can be made compact, and it can be installed in the distillation column at an appropriate size.
Smooth operation was enabled without high pressure loss.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view of a spiral heat exchanger of the present invention.

FIG. 2 is an explanatory sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Distillation tower 2 Spiral heat exchanger 3 Heat exchanger 4 Cone part 5 Introducing part 6 Steam 7 Central part 8 Heat medium 9 Drain outlet 10 Bypass pipe

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F28D 9/04 B01D 5/00 F28B 1/02 B01D 3/32

Claims (1)

(57) [Claims] 1. A heat exchanger provided at the top of a distillation column for condensing steam from the distillation column with water or another heat medium, a cone section for guiding the steam below the heat exchanger, And an inlet provided above the exchanger.The steam from the distillation column passes from the cone through the center of the heat exchanger, enters the inlet from the inlet into one of the heat transfer surfaces, and the other side of the heat transfer medium. A spiral heat exchanger for exchanging heat and discharging from a drain outlet, wherein one or more bypass pipes for directly connecting a steam rising part and an introduction part are provided. .