JPH04347401A - High pressure water supplying heater - Google Patents

Abstract

PURPOSE:To spread heated steam in the heating pipe in an inner cylinder below the heated steam inlet from the upper section to the bottom section of the inner cylinder. CONSTITUTION:A cut-out section 1a is provided in an inner cylinder 1 below the heated steam inlet 3a, and at the same time at the bottom section of the inner cylinder 1 below the heated steam inlet 3a a steam channel 7 at the bottom section of the inner cylinder is provided the heated steam spreads from the side face of the inner cylinder 1 and goes through the cut-out section 1a and flows to the heating pipe and at the same time it goes through the steam channel 7 at the bottom section of the inner cylinder and flows to the heating pipe at the bottom section of the inner cylinder so that the heat transfer area is used effectively.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feed water heater for heating feed water to a boiler.

0002

2. Description of the Related Art FIG. 3 is a vertical sectional view of the upper half of a conventional high-pressure feed water heater. The high-pressure feedwater heater includes a heated steam inlet 3a formed at the attachment portion of the steam inlet nozzle 3 of the body 2, through which heated steam is injected into the body 2. 4 is a tube plate that covers the end surface of the body 2. The inside of the body 2 is divided into upper and lower parts by an internal partition plate 5. A large number of heat transfer tubes (not shown) are arranged inside the inner cylinder 1, water to be supplied to the boiler flows through the heat transfer tubes, and heated steam flows outside the tubes. The part where heating steam is injected into the high-pressure feed water heater corresponds to the superheat return part.
In this part, the heating steam heats the feed water, and the temperature of the steam decreases to the saturation temperature with respect to the steam pressure. Figure 4 is I of Figure 3.
It is a V-IV sectional view. In FIGS. 3 and 4, arrows indicate the flow of steam.

0003

[Problems to be Solved by the Invention] A conventional high-pressure feed water heater has an inner cylinder 1 installed near a heating steam inlet 3a formed by attaching a steam inlet nozzle 3 to a body 2. is installed for the steam flow path of the desuperheating section,
Since it is installed close to the tube plate 4, the heating steam inlet 3a
Most of the steam injected from the inner cylinder 1 flows to the upper part of the inner cylinder 1.
There was a problem in that steam was difficult to spread in the lower part of the inner cylinder 1, and a part of the heat transfer tube in the inner cylinder 1 had a heat transfer area that was thermally inactive, making it difficult to use the heat transfer area effectively.

SUMMARY OF THE INVENTION An object of the present invention is to provide a high-pressure feedwater heater in which heating steam is sufficiently spread from the top to the bottom of the inner cylinder through the heat transfer tube inside the inner cylinder below the heating steam inlet.

[0005]

[Means for Solving the Problems] A boiler is equipped with an inner cylinder disposed inside the body and a plurality of heat transfer tubes disposed inside the inner cylinder, and heated steam is injected from the heated steam inlet of the body. In a high-pressure feed water heater for heating water supplied to a water tank, a notch is provided in the inner cylinder below the heating steam inlet, and an inner cylinder bottom steam flow path is provided in the bottom of the inner cylinder below the heating steam inlet. By doing so, the above objectives will be achieved.

In the high-pressure feed water heater according to claim 1, if the cutout of the inner cylinder is formed by cutting out the side surface of the inner cylinder below the heated steam inlet up to the internal partition plate, the heated steam can be absorbed into the inner cylinder. It is suitable for spreading on the side of the cylinder.

Furthermore, in the high-pressure water heater according to claim 1, a bottom partition plate is provided which is continuous with the notch of the inner cylinder and is closer to the center of the body than the internal partition plate, and the bottom partition plate allows the bottom part of the inner cylinder to be Forming a steam flow path at the bottom of the inner cylinder is suitable for spreading heated steam to the bottom of the inner cylinder.

[0008]

[Operation] In this invention, since a notch is provided in the inner cylinder below the heating steam inlet, the heated steam injected from the heating inlet passes through the side surface of the inner cylinder and spreads downward into the inner cylinder, and further into the inner cylinder. The heated steam spreads to the bottom steam flow path of the inner cylinder at the bottom of the cylinder and spreads over the entire surface of the inner cylinder, so that the heated steam spreads over the entire heat transfer tube, making effective use of the heat transfer area.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a longitudinal cross-sectional view of the upper half of a high-pressure feed water heater according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II--II in FIG. In FIGS. 1 and 2, the same parts as in FIGS. 3 and 4 are designated by the same reference numerals. The high-pressure feedwater heater includes a heated steam inlet 3a formed by attaching a steam inlet nozzle 3 to the body 2, from which heated steam is injected into the body 2. 4 is a tube plate that covers the end surface of the body 2. The inside of the body 2 is divided into upper and lower parts by an internal partition plate 5. A large number of heat transfer tubes (not shown) are arranged inside the inner cylinder 1, water to be supplied to the boiler flows through the heat transfer tubes, and heated steam flows outside the tubes.

[0010] In the high-pressure feed water heater according to the embodiment of the present invention, the side surface of the inner cylinder 1 below the heating steam inlet 3a is cut out to the internal partition plate 5 to form a cutout portion 1a. As a result,
As shown by the arrows in FIGS. 1 and 2, the heated steam passes through the upper part of the inner tube 1, spreads to the side surface of the inner tube 1, and flows into the heat transfer tube (not shown) from the side surface.

Furthermore, since an inner cylinder bottom steam passage 7 is formed which is connected to the notch 1a of the inner cylinder and partitioned by a bottom partition plate 6 below the internal partition plate 5, the heated steam flowing in from the heated steam inlet 3a The steam passes through the notch 1a of the inner cylinder 1, flows down to the inner cylinder bottom steam passage 7, and further flows to the heat transfer tube near the bottom.

0012

Effects of the Invention The present invention provides a notch in the inner cylinder below the heated steam inlet of a high-pressure feed water heater, and also provides a bottom steam passageway in the bottom of the inner cylinder that connects to the notch. Since the flow spreads throughout the tube bundle from the top to the bottom, the heat transfer area, which is thermally inactive, is reduced and the heat transfer area can be used effectively, making it possible to sufficiently heat the water supplied to the boiler. .

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of the upper half of a high-pressure feedwater heater according to an embodiment of the invention.

FIG. 2 is a sectional view taken along line II-II in FIG. 1;

FIG. 3 is a longitudinal sectional view of the upper half of a conventional high-pressure feed water heater.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;

[Explanation of symbols]

1 Inner cylinder 1a Notch 2. Torso 3 Steam inlet nozzle 3a Heating steam inlet 5 Internal partition plate 6 Bottom partition plate 7 Inner cylinder bottom steam flow path

Claims (3)

[Claims] Claim 1: A boiler comprising an inner cylinder disposed inside the body and a plurality of heat transfer tubes disposed inside the inner cylinder, and heated steam is injected from the heated steam inlet of the body to supply water to the boiler. A high-pressure feed water heater for heating, characterized in that a notch is provided in the inner cylinder below the heating steam inlet, and an inner cylinder bottom steam flow path is provided in the bottom of the inner cylinder below the heating steam inlet. High pressure water heater. 2. The high-pressure feed water heater according to claim 1, comprising:
A high-pressure feed water heater characterized in that the cutout part of the inner cylinder is formed by cutting out the side surface of the inner cylinder below the heating steam inlet up to the internal partition plate. 3. The high-pressure feed water heater according to claim 1, comprising:
A high pressure device characterized in that a bottom partition plate is connected to the notch of the inner cylinder and is closer to the center of the body than the internal partition plate, and the bottom partition plate forms an inner cylinder bottom steam flow path at the bottom of the inner cylinder. Feed water heater.