JP6345382B2 - Heat exchanger - Google Patents

Description

The present invention relates to a heat exchanger capable of generating and supplying hot water having a predetermined temperature by heating water with heating steam.

As a heat exchanger, a cooling tub 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 a lower portion of the heat recovery chamber. Thus, it is possible to efficiently exchange heat between steam and water by preventing non-condensable gas such as air from flowing into the heat recovery chamber.

In this heat exchanger, there is a problem that the amount of heat held by the steam cannot be completely exchanged with water. This is because only the steam and water are heat-exchanged, and the steam is condensed and does not exchange heat between the high-temperature condensate and water. That is, the conventional heat exchanger uses only the latent heat when the vapor changes phase from the gas phase to the liquid phase, but does not sufficiently use the sensible heat possessed by the high-temperature condensate. Because.

Japanese Patent Laid-Open No. 60-120186

The problem to be solved is to provide a heat exchanger capable of improving the heat exchange rate of steam and water by utilizing the sensible heat of the high-temperature condensate together with the latent heat of the steam.

In the present invention, steam and water are supplied to a heat exchange container, and the water is heated to a predetermined temperature by steam, and a heating steam pipe through which heating steam passes is attached to the inside of the first heat exchange container, A liquid pumping member connected to the heating steam pipe is disposed below the first heat exchange container, a second heat exchange container is connected to the condensate outlet of the liquid pumping member, and the second heat exchange container The heat exchange between hot condensate and water.

The heat exchanger of the present invention heats water with the latent heat accompanying the phase change of the steam in the heating steam pipe of the first heat exchange container, and heats the water with the sensible heat of the high-temperature condensate in the second heat exchange container. By doing so, the heat exchange rate of steam and water can be improved.

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

The present invention uses a first heat exchange vessel with a heated steam pipe and a second heat exchange vessel that performs sensible heat heating. The second heat exchange vessel also has a high-temperature condensate inside. It is preferred to attach and indirect heat exchange between hot condensate and water.

In FIG. 1, a first heat exchange container 1, a steam supply pipe 2 for supplying steam for heating to the first heat exchange container 1, and a heating steam pipe 3 attached to the inside of the first heat exchange container 1. And the heat exchanger is comprised by the 2nd heat exchange container 6 connected to the condensate exit 5 of the liquid pumping member 4 and the liquid pumping member 4 arrange | positioned in the lower part of the 1st heat exchange container 1. FIG.

  The first heat exchange container 1 is a cylindrical tank, and a steam supply pipe 2 is connected to the upper part, and a hot water supply pipe 7 from the second heat exchange container 6 is connected to the lower part. A hot water discharge pipe 8 heated to a predetermined temperature inside the first heat exchange container 1 is connected to the upper right side surface of the first heat exchange container 1. The right end of the hot water discharge pipe 8 is connected to a hot water use device (not shown).

  A liquid pumping member 4 is disposed below the first heat exchange container 1. The liquid pumping member 4 has a check valve 14 attached to the inlet side of the condensate inlet 12 into which condensate condensed with steam through the heating steam pipe 3 of the first heat exchange vessel 1 flows. This check valve 14 allows the condensate to pass to the liquid pumping member 4 and does not allow the condensate to pass in the reverse direction.

 A condensate pressure feed line 17 is also connected to the condensate outlet 5 of the liquid pressure feed member 4 via a check valve 16. This check valve 16 allows the condensate to pass only from the liquid pumping member 4 to the condensate pumping line 17 side. The left end of the condensate pressure feed line 17 is connected to the upper part of the second heat exchange vessel 6.

 A high-pressure steam inlet 19 connected to a high-pressure steam supply pipe 18 as a pressure-feeding fluid is provided on the upper part of the liquid pressure-feeding member 4. The upper end of the high-pressure steam supply pipe 18 is connected to the steam supply pipe 2. A high-pressure steam outlet 20 is provided on the right side of the high-pressure steam inlet 19. A high-pressure steam discharge pipe 21 is connected to the discharge port 20.

 When the float (not shown) arranged inside is located in the lower part, the liquid pressure feeding member 4 is closed with the high-pressure steam inlet 19 while the outlet 20 is opened, so that the first heat exchange container 1 Condensate condensed with steam in the heating steam pipe 3 flows into the liquid pressure feeding member 4 through the check valve 14 and the condensate inlet 12.

  When condensate accumulates in the liquid pumping member 4 and a float (not shown) is positioned at a predetermined upper portion, the discharge port 20 is closed, while the high-pressure steam inlet 19 is opened, and the high-pressure steam supply pipe 18 Steam flows into the liquid pumping member 4, and the condensate accumulated inside is pumped to the second heat exchange vessel 6 through the condensate outlet 5, the check valve 16 and the condensate pumping line 17. is there.

  When the condensate is pumped and the water level in the liquid pumping member 4 decreases, the high pressure steam inlet 19 is closed again and the outlet 20 is opened, so that the condensate is fed from the condensate inlet 12 to the liquid pumping member. It flows down into 4. By repeating such an operation cycle, the liquid pumping member 4 pumps the condensate condensed with steam in the first heat exchange vessel 1 to the second heat exchange vessel 6.

  A water supply pipe 9 is connected to the lower part of the second heat exchange vessel 6 and a lower end part of the hot water supply pipe 7 is connected to the upper part. A steam trap 10 having a function of discharging only the condensate to the outside is attached to the lower end portion of the condensate pressure-feeding conduit 17 of the second heat exchange vessel 6.

The steam supplied from the steam supply pipe 2 to the heating steam pipe 3 of the first heat exchange vessel 1 is condensed to condensate by heating the internal warm water to a predetermined temperature, and is a liquid pressure-feeding member installed in the lower part. Flow down to 4. On the other hand, the hot water heated to a predetermined temperature in the first heat exchange vessel 1 is supplied from the hot water discharge pipe 8 to a hot water using device (not shown).

Since the condensate flowing down to the liquid pumping member 4 is in a high temperature state, it has a large amount of heat, and this high temperature condensate is supplied from the liquid pumping member 4 to the second heat exchange vessel 6 and is supplied to the water supply pipe. The water supplied from 9 is heated by sensible heat. The sensible heat-heated water is supplied from the hot water supply pipe 7 to the first heat exchange container 1 and is latently heated with steam.

  INDUSTRIAL APPLICABILITY The present invention can be used as a heat exchanger that can heat water with heating steam to generate and supply hot water at a predetermined temperature.

DESCRIPTION OF SYMBOLS 1 1st heat exchange container 2 Steam supply pipe 3 Heating steam pipe 4 Liquid pumping member 5 Condensate outlet 6 Second heat exchange container 7 Hot water supply pipe 8 Hot water discharge pipe 9 Water supply pipe 12 Condensate inlet 17 Condensate pressure feed Line 18 High-pressure steam supply pipe 19 High-pressure steam inlet 20 High-pressure steam outlet

Claims (1)

A heat exchanger for heating water to a predetermined temperature with steam,
A first heat exchange vessel that has a heating steam pipe through which heating steam passes, and heats the hot water supplied from the outside with the heating steam;
A liquid pumping member connected to a heating steam pipe downstream of the first heat exchange vessel and pumping the condensate discharged from the heating steam pipe to the outside using high-pressure steam;
The have a recovery pressure Okukanro connected to condensate outlet of the liquid pumping member, hot water obtained by sensible heat of water supplied from the outside in the condensate of the condensate water pressure Okukanro, wherein A second heat exchange container that is supplied to the inside of the first heat exchange container,
The liquid pumping member is a heat exchanger that pumps the condensate discharged from the heating steam pipe to the condensate pumping line of the second heat exchange container using high-pressure steam.