JP2000304466A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To externally exhaust only non-condensing gas by providing an indirect heat exchanging portion for heat exchanging vapors of an atmosphere open portion and a heat exchanging container with a cooling fluid. SOLUTION: In the case that a large quantity of non-condensing gas such as, for example, air or the like is contained in a steam supplied from a steam supply port 2 to a heat exchanger 1, gas stored in a heat exchanging container 1 entrains a part of steam and arrives at an atmosphere open tube 4 while moving from a lower end 10 of the tube to the tube 4. A mixed gas of the non-condensing gas with the steam is brought into contact with an indirect heat exchanging portion 20 in the open tube so that the non-condensing gas or the like is not condensed, but the steam is heat exchanged, condensed to water droplets, which are dropped to a lower portion of the tube 4, i.e., the container 1 by its own weight. The non-condensing gas such as the air or the like obtained by heat exchanging with the steam is discharged from the upper portion of the tube 4 to an exterior.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a technique for condensing steam remaining in a steam-using apparatus or re-evaporated steam generated from a high-temperature drain by exchanging heat with a cooling fluid such as water. The present invention relates to a device that eliminates steam that can accumulate with a moyamoya gas or uses hot water whose temperature has been increased by exchanging heat with a cooling fluid to separately use the retained heat of the steam.

[0002]

2. Description of the Related Art A conventional heat exchanger of this type is disclosed, for example, in JP-A-60-120186. This is achieved by installing a cooling pipe inside a heat recovery chamber having a steam supply port, connecting the air release section to this heat recovery chamber, and storing condensate in the air release section and the lower part of the heat recovery chamber.
It is possible to prevent non-condensable gas, for example, air, from flowing into the heat recovery chamber and efficiently exchange heat.

[0003]

In the above-mentioned conventional heat exchanger, it is possible to prevent the inflow of non-condensable gas such as air from the outside of the heat recovery chamber. If the non-condensable gas is mixed, there is a problem that a part of the vapor is discharged to the outside from the open-to-atmosphere portion due to the flow of the non-condensable gas. The steam discharged together with the non-condensable gas deteriorates the environment around the heat exchanger and must be prevented as much as possible.

[0004] Therefore, an object of the present invention is to solve the problem even when non-condensable gas such as air is mixed in supplied steam.
It is an object of the present invention to obtain a heat exchanger that does not discharge steam to the outside as much as possible.

[0005]

Means taken to solve the above problem is to supply steam and a cooling fluid to a heat exchange container provided with an open-to-atmosphere section, and to perform heat exchange of the steam with the cooling fluid. In this case, an indirect heat exchange unit for exchanging heat between the steam and the cooling fluid is provided in both the atmosphere opening unit and the heat exchange container.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The steam supplied to a heat exchange vessel is
The heat is exchanged by the cooling fluid in the indirect heat exchange section in the heat exchange vessel and condensed. If non-condensable gas such as air is mixed in the supplied steam, the non-condensable gas will be cooled by the cooling fluid and will not be condensed. Some of the remaining steam without condensing also reaches the open air part.

Since the indirect heat exchange section is also provided in the atmosphere opening section, the mixed fluid of the non-condensable gas and the vapor is exchanged with heat while passing through the indirect heat exchange section, and the vapor condenses to form water droplets. It becomes a drain and drops in the atmosphere opening part and accumulates at the bottom of the heat exchange vessel. Only the non-condensable gas from which the water droplets of the vapor have been separated is discharged out of the system from the open air portion.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a heat exchange vessel 1, a steam supply port 2 for supplying steam to be condensed, an overflow pipe 3 for discharging a drain condensed with steam, and an atmosphere provided in the center of the heat exchange vessel 1 Open-air pipe 4 as an open part, and
A heat exchanger is constituted by the indirect heat exchange units 5 and 20 provided in the heat exchange container 1 and the atmosphere open pipe 4 respectively.

The indirect heat exchange sections 5 and 20 are each formed by arranging a copper pipe in a coil shape, and connect the indirect heat exchange section 20 in the open-to-atmosphere pipe 4 with the indirect heat exchange section 5 in the heat exchange vessel 1. The pipes 11 and 12 are connected, and the indirect heat exchange section 20 is connected.
Is connected to the cooling fluid supply pipe 6. The upper end 14 of the indirect heat exchange unit 5 is connected to the hot water discharge pipe 8.

The cooling fluid such as water supplied from the cooling fluid supply pipe 6 is first heat-exchanged in the indirect heat exchange section 20 in the open-to-atmosphere pipe 4 and then in the indirect heat exchange section 5 in the heat exchange vessel 1. The heat is again exchanged to become hot water, and the hot water is discharged from the hot water discharge pipe 8 to the outside of the system.

A steam supply port 2 provided at the upper part of the heat exchange vessel 1
Is connected to the outlet side of a steam-using device (not shown) such as a blower or a shrink tunnel or a re-evaporation tank via a valve 9 to supply steam to the heat exchange vessel 1 for condensation.

Atmospheric open pipe 4 provided at the center of heat exchange vessel 1
Is opened below the heat exchange vessel 1, and the overflow pipe 3 is attached to the center of the atmosphere opening pipe 4. The steam supplied from the steam supply port 2 into the heat exchange container 1 is cooled by the indirect heat exchange unit 5 and condensed to be drained and accumulated in a lower portion of the heat exchange container 1. The accumulated drain rises in the atmosphere open pipe 4 due to the pressure of the supplied steam, and is discharged to the outside from the upper end of the overflow pipe 3 via the discharge pipe 7.

When a large amount of non-condensable gas, such as air, is contained in the steam supplied from the steam supply port 2 to the heat exchange vessel 1, the gas accumulated in the heat exchange vessel 1 is discharged from the lower end of the atmosphere opening pipe 4. A part of the steam is entrained from 10 to the open-to-atmosphere pipe 4 and reaches the inside of the to-be-opened to-air pipe 4.

The mixed fluid of the non-condensable gas and the vapor comes into contact with the indirect heat exchange section 20 in the open-to-atmosphere pipe 4, and the non-condensable gas such as air does not condense, but the vapor exchanges heat and condenses. As a result, the water drops by its own weight and drops into the lower part of the open-to-atmosphere pipe 4, that is, the lower part of the heat exchange vessel 1. The non-condensable gas such as air separated by the heat exchange of the steam is discharged to the outside from the upper part of the atmosphere opening pipe 4.

By discharging only the non-condensable gas to the outside, unlike the case where steam is contained, the scum and steam do not enter the surroundings, and do not adversely affect the surroundings.

[0016]

According to the present invention, even when non-condensable gas such as air is contained in the supplied steam, the non-condensable gas is mixed into the non-condensable gas by providing the indirect heat exchange section in the open-to-atmosphere section. The generated steam is heat-exchanged in the indirect heat exchange unit and drops as water droplets, so that only the non-condensable gas can be discharged to the outside, and the deterioration of the surrounding environment can be prevented.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional configuration diagram showing an embodiment of a heat exchanger of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchange container 2 Steam supply port 3 Overflow pipe 4 Open air pipe 5 Indirect heat exchange section 6 Cooling fluid supply pipe 8 Hot water discharge pipe 20 Indirect heat exchange section

Claims (1)

[Claims] A steam and a cooling fluid are supplied to a heat exchange container provided with an open-to-atmosphere portion, and the steam is condensed by exchanging heat with the cooling fluid. A heat exchanger comprising an indirect heat exchange section for exchanging heat between steam and a cooling fluid.