JP2942687B2 - Nozzle mounting structure for container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power plant, a petrochemical plant, a chemical plant or the like, and more particularly to a structure for mounting a nozzle in a tower, a heat exchanger, or a vessel in which a temperature change of an internal fluid occurs. Things.

[0002]

2. Description of the Related Art For example, when a high-temperature or low-temperature fluid flows into a nozzle portion attached to a head portion of a container, thermal expansion or heat is generated between the head portion 1 and the nozzle portion 2 as shown in FIG. A difference occurs in the amount of shrinkage, and the amount of displacement causes a difference in the amount of displacement between the end plate 1 and the nozzle 2 in FIG.
As shown by the arrow in FIG. 4, a remarkable loosening-like thermal transient stress is generated. There has been a concern that cracks may be generated due to fatigue caused by the thermal transient stress.

To prevent this, as shown in FIG. 4, for example, an annular space 3 is provided in a nozzle portion 2 attached to a head plate portion 1 of a container, and an inert gas is sealed in the annular space 3. By forming the heat insulating layer, a structure is adopted in which the thermal displacement in the radial direction of the nozzle portion, which is thinner than that of the head plate portion, is delayed, and is matched with the thermal displacement of the head plate portion.

[0004]

However, the structure in which the heat insulating layer is formed in the nozzle portion as shown in FIG. 4 described above is generally complicated, including its work. SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems in the conventional nozzle mounting structure, and has been developed for a container capable of controlling the thermal displacement of the end plate without using a complicated structure . It is an object of the present invention to provide a structure for mounting a nozzle.

[0005]

In order to achieve the above-mentioned object, a structure for attaching a nozzle to a container according to the present invention is a structure for attaching a nozzle to a container. An internal member having a spherical surface for the fluid flowing into the container from the
It has a predetermined clearance with the inner peripheral surface of the container, is installed so as to be able to absorb thermal displacement due to heat transfer from the inflow fluid, and
The position of the internal member facing the nozzle is inside the nozzle.
A protruding conical cylindrical body is inserted into the body .

[0006]

Mounting portion of the nozzles with respect to the container of the effects of the present invention, the container interior at the mounting portion of the nozzle, the internal member having a spherical surface against the flowing fluid into the container from the nozzle, the inner peripheral surface of the container with a predetermined If there is a gap and it is installed so that it can absorb thermal displacement due to heat transfer from the inflow fluid
In both cases, at the position facing the nozzle of the internal member,
Since the conical cylindrical body inserted into the nozzle is protruded , the flow velocity of the inflowing fluid flowing through the gap becomes faster than the flow velocity inside the nozzle, and the rise in the temperature of the container in the vicinity of the mounting portion of the nozzle is reduced. The temperature is increased faster than the temperature rise, and the amount of thermal displacement of the nozzle and the amount of thermal displacement of the container near the nozzle attachment portion are made as uniform as possible.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a mounting portion of a nozzle to a container according to the present invention will be described below based on one embodiment shown in FIGS. FIG. 1 is a cross-sectional view showing one embodiment of a structure for attaching a nozzle to a container of the present invention, and FIG.
FIG.

FIG. 1 and FIG. 2 show an example in which the nozzle mounting structure of the present invention is applied to a head plate 1 of a container.
Reference numeral denotes an internal member installed at a portion where the nozzle portion 2 is mounted inside the end plate portion 1. The internal member 4 has a spherical surface with respect to the fluid flowing from the nozzle portion 2 into the container, and is disposed with a predetermined gap g from the inner peripheral surface of the end plate portion 1.

Since the internal member 4 receives the fluid pressure due to the inflow fluid from the nozzle portion 2, the internal member 4 is divided into four equal positions on the circumference (positions of 0 °, 90 °, 180 °, and 270 °).
A metal fitting 1a provided on the end plate 1 is supported via a pin 1b. In this embodiment, in order to absorb the thermal displacement of the internal member 4 in the radial direction, the metal fitting 1a is used.
The insertion hole of the pin 1b opened in the above is a long hole in the horizontal direction.

Reference numeral 5 denotes, for example, a conical cylindrical body which is coaxial with the nozzle portion 2 and protrudes from the internal member 4 so as to be inserted into the nozzle portion 2. The fluid flowing into the container is contracted in the nozzle portion 2 by the action of the cylindrical body 5 and then flows into the container through the gap g.

When passing through the gap g, the flow velocity of the inflowing fluid increases, and the film coefficient (heat transfer coefficient) increases. That is, when the temperature of the fluid changes, the temperature change on the end plate portion 1 side is accelerated so as to be as similar as possible to the temperature change on the nozzle portion 2 side. Normally, the nozzle part 2 and the end plate part 1
Since the connection corner between tends to be thick, the conical tubular body 5, Ru der which an action of promoting the temperature change in this portion.

In adopting the structure for attaching the nozzle to the container according to the present invention, the values set by the thermal transient analysis are used for the set value of the gap g, the dimensions of the conical cylindrical body 5, and the like.

[0013]

As described above, according to the nozzle mounting structure of the present invention, the amount of thermal displacement between the end plate portion and the nozzle portion of the container can be easily made uniform. Moreover, in the present invention, since the internal member has a spherical shape, the fluid flow is smooth and the pressure loss does not become extremely large depending on the gap, though it depends. The internal member is also effective as a vortex eliminator, and has a double effect when the fluid flows out of the container to the nozzle portion.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a structure for attaching a nozzle to a container according to the present invention.

FIG. 2 is a view taken on line AA of FIG. 1;

FIG. 3 is an explanatory diagram of a thermal transient stress generated in a connection portion between a container and a nozzle portion.

FIG. 4 is an explanatory view of a conventional nozzle mounting structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 End plate part 1a Metal fitting 1b Pin 2 Nozzle part 4 Internal member g Gap

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F16L 57/00 F16L 51/00 F22B 37/22 F28F 9/26 B65D 25/02

Claims (1)

(57) [Claims] 1. A structure for attaching a nozzle to a container, wherein an internal member having a spherical surface with respect to a fluid flowing from the nozzle to the container is provided inside the container at the nozzle attachment portion at a predetermined distance from an inner peripheral surface of the container. With a gap of
Install so that thermal displacement due to heat transfer from inflow fluid can be absorbed
At the same position as the nozzle of the internal member.
Is a structure for attaching a nozzle to a container, wherein a conical cylindrical body inserted into the nozzle protrudes .