JPS63207997A - Heat exchanger - Google Patents

Abstract

PURPOSE:To reduce the velocity of fluid flow, to spread a flow throughout the whole of the interior a heat exchanger drum body, and to improve the efficiency of heat transfer, by using a plurality of impingement guard plates forming a porous plate. CONSTITUTION:A plurality of impingement guard plates 1 are mounted to the lower part of an inlet nozzle 2 by means of a spacer 3. The velocity of fluid flow is reduced when the fluid passes through a plurality of the impingement guard plates 1, and it flows down to a heat transfer pipe part 4, spreading throughout the whole of the interior of a heat exchanger drum body 5. A spacer 3 serves to properly hold the impingement guard plates, and is situated so that the flow of the fluid is effected properly and as estimated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heat exchanger structure, and particularly to a heat exchanger suitable for preventing intrusion and binging at an inlet nozzle portion and improving heat transfer efficiency.

[Conventional technology]

A conventional example is shown in FIG.

Conventionally, there was no impingement guard plate, or only a single impingement guard plate was attached to the inlet nozzle portion of the heat exchanger.

As a similar prior art, there is Japanese Patent Application Laid-Open No. 49-80651.

[Problem that the invention seeks to solve]

In the prior art, no consideration was given to the fact that when only one impingement guard plate is attached, the impingement guard plate creates a flow stagnation portion and a portion where the flow velocity is high.

There is a problem that the heat transfer tubes in the fluid retention area are not used effectively and the heat transfer efficiency is poor, and in areas where the flow velocity is high, the flow velocity does not decrease and the fluid continues to collide with the heat transfer tubes.

There has been a problem in that a so-called impingement attack occurs in which the heat exchanger tubes are scraped off by the fluid, resulting in corrosion of the heat exchanger tubes.

An object of the present invention is to provide a heat exchanger that prevents impingement while preventing flow stagnation and improving heat transfer efficiency.

[Means for solving problems]

For example, the impingement guard plate attached to the heat exchanger inlet nozzle is made of a perforated plate. By using multiple sheets of this and arranging the holes in the perforated plates in a staggered manner as shown in Figure 3, high-pressure, high-speed fluid can be transferred to the impingement guard plate (
(a plate with multiple through holes), some of the fluid is obstructed by the plate, causing the flow direction to change and the flow velocity to slow down. In addition, the high-speed fluid that passes through the through hole engulfs the surrounding fluid.

Flow velocity decreases.

[Effect]

The ends of the perforated impingement guard plate are open, and the fluid collides with the first impingement guard plate and flows out through the holes and the ends of the impingement guard plate while reducing the flow velocity.

The material flowing out from the holes collides with a two-hole impingement guard plate whose holes are arranged so that it does not come into contact with the heat transfer tube, and then the flow velocity is reduced and the direction of the flow is changed.
1. Flowing while spreading throughout the heat exchanger body. This eliminates the conventional flow stagnation area, makes effective use of the heat transfer tubes, and improves heat transfer efficiency. In addition, since there are no parts where the flow velocity is high, corrosion due to impingement attack is eliminated.

〔Example〕

FIG. 1 shows an embodiment of a heat exchanger inlet nozzle structure according to the present invention. A plurality of impingement guard plates 1 are attached to the lower part of an inlet nozzle 2 by spacers 3. As shown in FIG.

The fluid is decelerated when passing through the plurality of impingement guard plates 1, and flows down to the heat exchanger tube portion 4 while spreading throughout the heat exchanger body 5. The spacer 3 is used to properly hold the impingement guard plate, and is installed so that the fluid flow is appropriate and as planned.

According to this embodiment, by using a plurality of perforated impingement guard plates as shown in the figure, the flow velocity of the fluid can be reduced and the flow can be spread throughout the interior of the heat exchanger body.

〔Effect of the invention〕

According to the present invention, heat transfer efficiency can be improved while preventing impingement.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional technique. FIG. 3 is a sectional view of the impingement guard plate of the present invention. 1... Impingement guard plate, 2... Inlet nozzle, 10th Tower 2 Figure 3'']L

Claims (1)

[Scope of Claims] 1. A body including a fluid inlet and an outlet, and a heat transfer tube through which a fluid other than the fluid passes through the body, comprising: the body near the fluid inlet; A first plate having a plurality of first through holes appropriately provided thereinto is provided on substantially the entire surface of the opening of the inlet portion while maintaining an appropriate distance from the body plate; A heat exchanger characterized in that a second plate is provided with a plurality of similar second through holes so as not to overlap with the through holes of the second plate, and is provided at an appropriate distance from the first plate. 2. The heat exchanger according to claim 1, wherein the first and second through holes have different diameters. 3. The heat exchanger according to claim 1, wherein the through holes of the plurality of plates have different sizes so that the through holes overlap. 4. The heat exchanger according to claim 1, wherein rod-shaped members are arranged with a gap provided over the entire surface or substantially the entire surface of the plurality of first and second plates.