JP2014095526A - Heat exchange device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchange device improved in heat recovering efficiency by recovering sensible heat of high-temperature condensate with latent heat of steam.SOLUTION: A steam supply pipe 2 and a cooling fluid supply pipe 3 are connected to a heat exchange container 1. An open air pipe 4 is mounted on the center of the heat exchange container 1. A cooling fluid pipe 8 is disposed at an outer periphery of the open air pipe 4. A siphon pipe 7 opened at its one end 5, and opened to the atmospheric air at the other end 6, is mounted on a lower portion of the heat exchange container 1. A heat exchange device improved in heat recovering efficiency can be provided by recovering not only latent heat of steam but also sensible heat of high-temperature condensate by allowing the high-temperature condensate accumulated at a lower portion 10 of the heat exchange container 1 to exchange heat by the cooling fluid pipe 8.

Description

In the present invention, the remaining steam used in various steam-using devices and the re-evaporated steam generated from the high-temperature condensate condensed with heat are heat-exchanged with a cooling fluid such as water to condense. The present invention relates to an apparatus that effectively uses the heat retained in steam by eliminating steam that can be trapped or by separately using hot water whose temperature has been increased by heat exchange of a cooling fluid.

In the conventional heat exchange device, a cooling pipe is installed in a heat recovery chamber having a steam supply port, and an air opening portion is communicated with the heat recovery chamber, and condensate is stored in the air opening portion and the lower portion of the heat recovery chamber. By doing so, non-condensable gas such as air can be prevented from flowing into the heat recovery chamber and heat can be exchanged efficiently.

  In this heat exchange device, there is a problem that the heat recovery rate remains at a relatively low value of about 80 percent to about 90 percent at most. This is because the cooling fluid only exchanges heat with the steam, and the steam does not condense and does not exchange heat between the condensate still in the high temperature state and the cooling fluid. That is, the conventional heat exchange device can recover the latent heat when the vapor changes phase from the gas phase to the liquid phase, but cannot sufficiently recover the sensible heat possessed by the high-temperature condensate.

Japanese Patent Laid-Open No. 60-120186

The problem to be solved is to provide a heat exchange device with improved heat recovery rate by recovering sensible heat of high-temperature condensate along with the latent heat of steam.

The present invention provides a cooling fluid pipe attached to the inside of a heat exchange container, supplies a cooling fluid to the cooling fluid pipe, supplies steam to the outer periphery of the cooling fluid pipe, and heat-exchanges the steam with the cooling fluid. In this case, a siphon tube having one end opened at the bottom of the heat exchange vessel and the other end opened to the atmosphere is attached.

  The heat exchange device according to the present invention has a siphon tube having one end opened at the bottom of the heat exchange container and the other end opened to the atmosphere. Condensate is retained, and the retained condensate is subjected to heat exchange by the cooling fluid pipe, so that sensible heat of the high-temperature condensate can also be recovered. Note that when the condensate water level staying exceeds the upper end of the siphon tube, the condensate up to the lower end opening position of the siphon tube is discharged to the outside by the action of the siphon tube. In this way, the condensate is periodically discharged to the outside by the siphon tube, so that the temperature of the condensate staying at the lower side of the heat exchange container is not supercooled, and the heat of the high-temperature condensate is efficiently It can be recovered well.

The block diagram which shows the Example of the heat exchange apparatus of this invention.

The heat exchanging apparatus of the present invention is for attaching a siphon jar having one end opened to the lower part of the heat exchange vessel and the other end opened to the atmosphere. be able to.

A steam supply pipe 2 and a cooling fluid supply pipe 3 connected to the heat exchange container 1, an atmosphere open pipe 4 attached to the center of the heat exchange container 1, a cooling fluid pipe 8 arranged on the outer periphery of the atmosphere open pipe 4, and heat A heat exchange device is configured with a siphon trough 7 having one end 5 opened at the bottom of the exchange container 1 and the other end 6 opened to the atmosphere.

The steam supply pipe 2 is connected to an outlet side of a steam using device (not shown), a high-temperature condensate re-evaporation tank or the like, and supplies steam into the heat exchange container 1 for condensation. A cylindrical pipe-shaped open air pipe 4 is provided at the center in the heat exchange vessel 1. A cooling fluid pipe 8 in which a copper long pipe is formed in a coil shape is arranged on the outer periphery of the atmosphere opening pipe 4, and the lower inlet side of the cooling fluid pipe 8 is connected to the cooling fluid supply pipe 3, and the upper outlet side is Connect to the hot water discharge pipe 9. The steam supplied from the steam supply pipe 2 into the heat exchange container 1 comes into contact with the outer surface of the cooling fluid pipe 8 to exchange heat and condense.

One end 5 of the substantially U-shaped siphon tube 7 is opened at the lower end of the heat exchange vessel 1, and the other end 6 is opened to the atmosphere. A pipe line 11 is connected to the other end 6 side of the siphon trough 7 so that the condensate can be recovered to a predetermined location.

The high-temperature condensate in which the steam is condensed in the heat exchange vessel 1 accumulates in the lower portion 10 of the heat exchange vessel 1 and is heat-exchanged in the cooling fluid pipe 8, so that the amount of heat held by the high-temperature condensate, The sensible heat of water can be recovered.

  When the water level of the condensate remaining in the lower portion 10 of the heat exchange vessel 1 exceeds the upper end portion 12 of the siphon tube 7, the condensate up to the lower end opening position 5 of the siphon tube 7 is operated by the siphon tube 7. Is discharged from the other end 6 to the outside. Once the condensate accumulated in the lower portion 10 of the heat exchange container 1 is discharged by the siphon tube 7, the steam supplied from the steam supply pipe 2 into the heat exchange container 1 is cooled, and again, the heat exchange container 1 stays in the lower side portion 10 and is subjected to heat exchange in the cooling fluid pipe 8.

  The present invention can be used as a heat exchange device with improved heat recovery rate by recovering sensible heat of high-temperature condensate together with latent heat of steam.

DESCRIPTION OF SYMBOLS 1 Heat exchange container 2 Steam supply pipe 3 Cooling fluid supply pipe 4 Atmospheric open pipe 5 One end 6 Other end 7 Siphon wall 8 Cooling fluid pipe 9 Hot water discharge pipe 12 Upper end

Claims (1)

A cooling fluid pipe is attached to the inside of the heat exchange container, and the cooling fluid is supplied to the cooling fluid pipe, and steam is supplied to the outer periphery of the cooling fluid pipe to condense the steam by heat exchange with the cooling fluid. And a siphon tube having one end opened at the bottom of the heat exchange vessel and the other end opened to the atmosphere.