JP2001099576A - Vertex condenser using spiral type heat-exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vortex condenser to prevent short-pass of steam from the side inflow passage of a core part to a heat-transfer plate. SOLUTION: Steam from a vaporizing can from a corn part is caused to pass through a core 2 of a heat-exchanger and return at a topmost part and enter the heat transfer surface of the heat-exchanger for condensation. In a vortex condenser 1 using a so formed spiral type heat-exchanger, a wide part 8 is situated at a partition plate 3 or a side inflow passage on the vapor side is locked or narrowed by a short pass preventing bar 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead condenser using a spiral heat exchanger provided at the top of an evaporator.

[0002]

2. Description of the Related Art An example of a conventional overhead condenser is shown in FIG. FIG. 4 is an enlarged plan view of the core portion viewed from above.
In FIGS. 3 and 4, reference numeral 1 denotes a top condenser, which is provided with a core portion 2 in the center, and two heat transfer plates 4 are wound around a partition plate 3 to constitute a spiral heat exchanger. 5 is a vapor side flow path, and 6 is a cooling water side flow path.

A cover plate 7 is provided at the upper end and the lower end of the heat exchanger, closes a half opening of the core part partitioned by the partition plate, and separates so that vapor does not enter the cold water flow path. . As a top condenser using a spiral heat exchanger, pure steam 10 from which impurities have been removed by an evaporator (not shown) is passed from a cone section 11 through the core section 2 of the heat exchanger, and turned back at the top. While passing through the heat transfer surface of the heat exchanger, it is condensed by cooling water to obtain a pure liquid.

In FIG. 3, reference numeral 10 denotes steam, 11 denotes a cone portion, which serves as a steam inlet. 12 is a steam outlet, 1
3 is a cooling water inlet, 14 is a cooling water outlet, and 15 is a drain outlet.

[0005]

When the overhead condenser using the spiral heat exchanger is operated, a part of the steam does not enter the vapor passage from the upper part of the core portion, and the vapor enters the side inlet passage on the vapor side. In some cases, a short pass may occur toward the heat transfer plate (a portion indicated by a dotted line in FIG. 4), and there is a problem that the heat efficiency in the heat exchanger is reduced. In particular, since the vapor-side flow path is wider than the cooling-water-side flow path, the short path amount has increased.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned difficulties, and to prevent a short-pass of steam from a vapor-side inflow passage of a core portion of a tower condenser toward a heat transfer plate. Things.

[0007]

In order to achieve the above object,
The first invention uses a spiral heat exchanger in which the vapor from the evaporator passes from the cone through the core of the heat exchanger, turns back at the top and enters the heat transfer surface of the heat exchanger to be condensed. The top condenser using a spiral heat exchanger in which the side inflow passage on the vapor side was closed or narrowed.

In the second invention, a top condenser using a spiral heat exchanger in which the partition plate is extended at the core portion of the heat exchanger to form a wide portion and the side inflow passage on the vapor side is closed or narrowed. In the third invention, a short-path preventing bar for closing or narrowing the side inflow passage on the vapor side near the partition plate is provided while the partition plate remains in the core portion of the heat exchanger.

(Function) In the first aspect of the invention, by completely closing the side inflow passage on the vapor side, it is possible to prevent the steam from short-passing from the side inflow passage, thereby preventing a decrease in thermal efficiency. Was. In place of the blockage, narrowing also has an effect of preventing a short path.

In the second invention, the partition plate is widened at the core portion of the heat exchanger, and the effect of closing the side inflow passage on the vapor side is obtained. According to the third aspect of the invention, the short path prevention bar is separately provided near the partition plate, so that the side inflow path on the vapor side can be closed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, during operation of a top condenser, a part of steam does not enter the vapor side flow path from the upper part of the core, but is short-circuited from the vapor side side inflow path toward the heat transfer plate. It did not pass and prevented the heat efficiency in the heat exchanger from being reduced. For this reason, the partition plate is extended to the side to increase the width, and a separate short path prevention bar for closing the side inflow path is provided.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
1 and 2 are plan views of the lid plate viewed from above the top condenser, 1 is a top condenser, and 2 is a core portion which vertically passes through the center of the top condenser 1. Reference numeral 3 denotes a partition plate, through which two heat transfer plates 4 are spirally wound to constitute a spiral heat exchanger. 5 is a vapor-side flow path, and 6 is a cooling water-side flow path. 7 is a cover plate,
It is provided at the upper and lower ends of the heat exchanger, and closes half of the core part partitioned by the partition plate, and separates so that vapor does not enter. Reference numeral 8 in FIG. 1 denotes a wide portion of the partition plate, which is provided by extending the side surface of the partition plate.

In FIG. 2, reference numeral 9 denotes a short-path prevention bar. The partition plate at the core portion of the heat exchanger has a conventional size, and the short-path prevention bar 9 is provided near the partition plate.
By providing the above, the side inflow path on the vapor side is closed or narrowed.

[0014]

According to the present invention, it is possible to prevent the steam from short-passing from the side wall of the partition plate by closing or narrowing the side inflow passage on the vapor side, and to provide a tower top condenser without a decrease in thermal efficiency. It became so.

[Brief description of the drawings]

FIG. 1 is an enlarged plan view of a core portion viewed from the top of the condenser of the present invention.

FIG. 2 is an enlarged plan view of a core portion showing another embodiment.

FIG. 3 is an explanatory view showing the internal structure of the tower by cutting off the condenser.

FIG. 4 is an enlarged plan view showing a conventional example of a core portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Top condenser 2 Core part 3 Partition plate 4 Heat transfer plate 7 Cover plate 8 Wide part 9 Short path prevention bar

Claims (3)

[Claims] 1. A spiral heat exchanger in which steam from an evaporator passes from a cone to a core of a heat exchanger, is turned at an uppermost portion, enters a heat transfer surface of the heat exchanger, and is condensed. A top condenser using a spiral heat exchanger, wherein the side condenser on the vapor side is closed or narrowed. 2. A top condenser using a spiral heat exchanger according to claim 1, wherein the partition plate is extended at the core portion of the heat exchanger to form a wide portion, and the side inflow passage on the vapor side is closed or narrowed. . 3. A short path prevention bar for closing or narrowing a side inflow passage on the vapor side near the partition plate while keeping the partition plate as it is at the core of the heat exchanger. An overhead condenser using the described spiral heat exchanger.