JP5436832B2 - Vacuum steam heater - Google Patents

Description

 The present invention relates to an apparatus for heating an object to be heated in a heat exchanger with low-pressure steam, and more particularly to a reduced-pressure steam heating apparatus suitable when the heating steam temperature is a relatively low temperature of about 100 ° C.

 A conventional vacuum steam heating apparatus is connected to a heat exchanger, a steam supply pipe for supplying heating steam to the heat exchanger, and a suction means for sucking a fluid in the heat exchanger. A gas-liquid separator that separates gas and liquid is disposed between the means, and the suction efficiency can be maintained high.

In the conventional reduced pressure steam heating apparatus, the heat exchanger is constituted by a plurality of rotating disks 10 and 11, but the pressure of steam supplied from the steam supply pipe 2 is low or the amount of supplied steam is low. When the number of the rotating disks 10 and 11 is small, the supply steam does not spread over the entire rotating disks 10 and 11, and the entire rotating disks 10 and 11 cannot be uniformly heated.
JP 2005-37046 A

  The problem to be solved is to obtain a reduced-pressure steam heating device that can uniformly heat the entire heat exchanger so that the supply steam can be distributed evenly throughout the heat exchanger.

In the present invention, a heat exchanger for storing a heat exchange object, a steam supply pipe for supplying heating steam to the heat exchanger, and a vacuum suction means for sucking a fluid in the heat exchanger are connected. The steam supplied from the steam supply pipe to the heat exchanger forms a steam discharge port and an air vent valve at a location where the heat exchanger does not spread, and the outlet side of the air vent valve is connected to the suction means by a pipe line. It is connected to the ejector so that steam is supplied to the entire heat exchanger.

  The present invention can create a steam flow forcibly from the steam supply part in the heat exchanger to the steam discharge port by forming the steam discharge port and the air vent valve in a place where the supply steam does not spread, Excess air that hinders heat exchange can be eliminated, steam can be supplied to the entire heat exchanger, and the entire heat exchanger can be heated uniformly.

  In the present invention, a steam discharge port is formed at a location where the steam does not reach in the heat exchanger, and this steam discharge port can be constituted by a valve or the like that can open and close the passage.

  In FIG. 1, a reaction kettle 1 as a heat exchanger, a suction means 2, a heating steam supply pipe 3, a steam outlet 4 and an air vent valve 20 constitute a vacuum steam heating apparatus.

 The steam supply pipe 3 is connected to a steam source such as a boiler (not shown), and a steam pressure control valve 7 is attached to be connected to the jacket portion 11 of the reaction kettle 1 as a heat exchanger.

 The lower end of the jacket portion 11 of the reaction kettle 1 is connected to the ejector 14 of the suction means 2 through a steam trap 12 and a valve 13. The suction means 2 is configured as a combination pump connected to the ejector 14, the tank 5, and the circulation pump 15 via the circulation path 16. The ejector 14 causes the fluid in the tank 5 to circulate and pass through the circulation pump 15, thereby generating a suction force according to the fluid temperature.

 The surplus fluid discharge pipe 9 is communicated by branching the circulation path 16. An opening / closing valve 10 is attached to the surplus fluid discharge pipe 9 to maintain the liquid level in the tank 5 at a predetermined level in conjunction with a level meter in the tank 5 (not shown).

 A steam outlet 4 is formed on the right side of the jacket portion 11 of the reaction kettle 1. The steam outlet 4 is connected to an ejector 14 via an automatic opening / closing valve 6. A temperature sensor 8 is attached to the lower part of the jacket part 11 to detect the temperature inside the jacket part 11 and transmit the signal to the automatic opening / closing valve 6. An air vent valve 20 is attached to the upper right side of the jacket portion 11. The outlet side of the air vent valve 20 is connected to the ejector 14 through a pipeline 21.

When heating an object (not shown) in the reaction kettle 1, heating steam is supplied from the steam supply pipe 3 to the jacket portion 11, and the circulation pump 15 is driven to generate a suction force by the ejector 14.

The steam supplied to the jacket portion 11 heats the superheated material in the reaction kettle 1, and the condensed condensate of the steam is sucked into the ejector 14 through the steam trap 12 and reaches the tank 5.

 When the pressure of the steam supplied from the steam supply pipe 3 is low, or when the amount of supplied steam is small, the necessary steam cannot be supplied into the jacket portion 11 on the opposite side of the steam supply pipe 3, Although the temperature of the portion is lowered, this temperature drop is detected by the temperature sensor 8 and the automatic opening / closing valve 6 is opened, thereby reaching the ejector 14 from the steam supply pipe 3 through the steam discharge port 4. A flow of steam can be created, and the entire inside of the jacket portion 11 can be uniformly steam-heated. Further, the air accumulated in the upper portion of the jacket portion 11 is sucked from the air vent valve 20 to the ejector 14.

The block diagram which shows the Example of the pressure reduction steam heating apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reaction kettle 2 Vacuum suction means 3 Steam supply pipe 4 Steam discharge port 5 Tank 6 Automatic opening / closing valve 8 Temperature sensor 11 Jacket part 14 Ejector 15 Circulation pump 20 Air vent valve

Claims (1)

A heat exchanger for accommodating the article to be heat-exchange material, in that connects the steam supply pipe for supplying steam for heating the heat exchanger, the vacuum suction means including an ejector for sucking the fluid in the heat exchanger ,
The sides and top of the heat exchanger steam supplied from the steam supply pipe to the heat exchanger there is a position not spread in the heat exchanger, the steam to create a flow of steam into the ejector from the steam supply pipe a discharge port, the air accumulated in the upper portion of the heat exchanger to form respectively an air vent valve for suction to the ejector,
The outlet side of the air vent valve, and connected to the ejector in line,
Vacuum steam heating apparatus is characterized in that as the steam is supplied to the entire of the said heat exchanger.

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