JP5457731B2 - Heat exchanger - Google Patents

Description

 The present invention relates to a heat exchanger that heats an object to be heated with heating steam supplied via a valve.

A conventional heat exchanger is a finned tube type heat exchanger that heats air using steam as a heat source. When the inside of the outlet header of the heat exchanger becomes a vacuum, it immediately injects outside air into the outlet header. It is possible to prevent condensate from staying in the heat exchanger by allowing condensate as condensate of steam generated in the inside to be quickly discharged out of the vessel via the steam trap. .

In the conventional heat exchanger described above, even when outside air is injected into the outlet header, the pressure cannot be increased above the atmospheric pressure, and the pressure on the outlet side of the steam trap is also atmospheric pressure. There was a problem that the pressure difference between the inlet side and the outlet side of the trap could hardly be secured, and the condensate could not be discharged reliably from the steam trap. The steam trap cannot quickly discharge condensate to the outlet side unless a predetermined pressure difference acts on the inlet side and the outlet side.

Japanese Patent Publication No.51-31998

  The problem to be solved is to ensure that a predetermined pressure difference is secured between the inlet side and the outlet side of the steam trap, and to reliably discharge the condensate generated in the heat exchanger to the outside through the steam trap. It is.

 The present invention provides steam that heats a heat exchange object in a heat exchange container with steam by supplying steam to the heat exchange container through a valve, and discharges condensate condensed by the heat to the outside. With a trap attached, a liquid level detection member was connected to the heat exchange container, a liquid ejector was connected to the outlet side of the liquid level detection member, and the suction chamber of the liquid ejector was connected to the outlet side of the steam trap Is.

  In the present invention, a liquid ejector is communicated with the outlet side of the liquid level detecting member, and the suction chamber of the liquid ejector is connected to the outlet side of the steam trap by the suction of the steam trap. The outlet side can be depressurized below atmospheric pressure, ensuring a sufficient pressure difference between the inlet side and the outlet side of the steam trap to reliably discharge the condensate generated in the heat exchanger. There is an advantage that you can.

It is a block diagram which shows the Example of the heat exchanger which concerns on this invention.

In the present invention, a liquid level detection member is connected to the heat exchange container. The liquid level detection member detects the liquid level of the condensate in the heat exchange container and supplies the liquid for driving to the liquid ejector. You can use what you can do.

  In FIG. 1, a steam supply pipe 3 connected to a jacket portion 2 of a reaction kettle 1 as a heat exchange vessel, a steam trap 4 communicating below the jacket portion 2, and a liquid level detection arranged on the side of the jacket portion 2 The member 5 and the liquid ejector 6 communicating below the liquid level detecting member 5 constitute a heat exchanger.

A control valve 7 for controlling the amount of steam supplied to the jacket portion 2 is attached to the steam supply pipe 3. The object to be heated in the reaction kettle 1 is heated by the heating steam supplied from the steam supply pipe 3 to the jacket portion 2.

It connects with the inlet side of the steam trap 4 by the pipe line 8 from the lower end of the jacket part 2. FIG. The outlet side of the steam trap 4 is connected to the suction chamber 10 of the liquid ejector 6 by a conduit 9.

A vertically long cylindrical liquid level detection member 5 is disposed on the right side of the jacket portion 2. The liquid level detection member 5 is connected to the lower portion of the jacket portion 2 via a check valve 12. The check valve 12 allows the fluid to flow from the jacket portion 2 to the liquid level detecting member 5 side, but prevents the fluid from flowing in the opposite direction.

A liquid level on / off valve 11 is attached to the right side surface of the liquid level detecting member 5 to open and close the valve when a predetermined liquid level is reached. A driving liquid pipe 15 is connected to the inlet side of the liquid level on / off valve 11.

The outlet 17 at the lower end of the liquid level on / off valve 11 is connected to a nozzle portion (not shown) in the suction chamber 10 of the liquid ejector 6 via a pipe 18. When the liquid level of the liquid level detection member 5 reaches a predetermined height, the liquid level opening / closing valve 11 is opened, the driving liquid is pumped to the liquid ejector 6, and a suction force is generated in the suction chamber 10 of the liquid ejector 6. To do.

 When heating an object to be heated (not shown) arranged in the reaction kettle 1, the object to be heated is heated by the steam by supplying a predetermined amount of steam from the steam supply pipe 3 and the control valve 7 to the jacket portion 2. The Usually, the amount of steam to be supplied is sufficient, and the inside of the jacket portion 2 maintains a high pressure state. Condensate condensed by heating passes through the steam trap 4 from the pipe line 8 at the lower end of the jacket portion 2 and is further discharged to the outside through the inside of the liquid ejector 6. In this case, since the jacket portion 2 is in a high pressure state, the generated condensate is discharged to the outside due to the pressure difference, and the liquid ejector 6 is not driven.

  When the amount of steam supplied from the control valve 7 to the jacket portion 2 decreases and the pressure in the jacket portion 2 also decreases, the amount of condensate discharged from the steam trap 4 also decreases. When the pressure in the jacket part 2 is reduced to about atmospheric pressure or below atmospheric pressure, no condensate is discharged from the steam trap 4, so condensate stays in the lower part of the jacket part 2 as shown in FIG. The liquid level detection member 5 also has the same liquid level as the jacket portion 2.

  When the liquid level on / off valve 11 of the liquid level detecting member 5 detects this high liquid level, the liquid level on / off valve 11 opens to pump the drive liquid to the liquid ejector 6. When driving liquid is supplied to the liquid ejector 6, a suction force is generated in the suction chamber 10, and the outlet side of the steam trap 4 is maintained at a pressure lower than atmospheric pressure and lower than that in the jacket portion 2. The condensate in the jacket portion 2 passes through the steam trap 4 and is sucked into the liquid ejector 6 and discharged to the outside.

  It can be applied as a condensate discharge device from various heat exchangers that use steam as a heat source.

DESCRIPTION OF SYMBOLS 1 Reaction kettle 2 Jacket part 3 Steam supply pipe 4 Steam trap 5 Liquid level detection member 6 Liquid ejector 7 Control valve 10 Suction chamber 11 Liquid level on-off valve 12 Check valve 15 Liquid pipe for drive

Claims (1)

By supplying steam for heating via a valve to the heat exchanger vessel, the object to be heat exchange of the heat exchanger vessel was heated with steam, fitted with a steam trap discharging condensate obtained by condensation of steam by heating to the outside In
A liquid level detection member is disposed on the side of the heat exchange container,
As condensate of the heat exchanger vessel is made possible flow down into the liquid level detecting member, and connecting the liquid level detecting member to the heat exchanger vessel,
A liquid level opening / closing valve is attached to the liquid level detection member,
A driving liquid pipe is connected to the inlet side of the liquid level on-off valve;
A liquid ejector is connected to the outlet side of the liquid level on-off valve ;
The suction chamber of the liquid ejector connected to the outlet side of the steam trap,
When the condensate flowing down from the heat exchange container reaches a predetermined liquid level in the liquid level detecting member, the liquid level opening / closing valve opens to pump the driving liquid to the liquid ejector. Heat exchanger.