JP2009066539A - Steam heating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steam heating apparatus which dispenses with an electric motor and does not consume electric power. <P>SOLUTION: An ejector 6, a liquid forcibly-sending pump 4 and a liquid tank 8 are connected respectively by passages. A suction port 12 of the ejector 6 is communicated with a jacket part 2. The liquid forcibly-sending pump 4 is connected to the side of an outlet of the ejector 6 while interposing a header tank 9 between them. A liquid discharge pipe 31 of the liquid forcibly-sending pump 4 is connected to the liquid tank 8 positioned above the ejector 6. A liquid is sent forcibly to the liquid tank 8 by the liquid forcibly-sending pump 4. The liquid accumulated in the liquid tank 8 falls down in the ejector 6 by the head equivalent to a difference between the height of the accumulated liquid and that of the ejector 6 and predetermined vacuum sucking force is generated in the ejector 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a steam heating apparatus that heats a heat exchange object by exchanging heat in the heat exchange chamber.

The conventional steam heating apparatus is provided with a control unit for controlling the water temperature in the tank by communicating the heat exchange chamber with the ejector, connecting a circulation pump to the ejector via the tank, and supplying cooling water to the tank. Thus, vibrations and impacts associated with the hammer phenomenon caused by the rapid condensation of steam can be prevented.

In the conventional steam heating device, an electric motor must be operated to drive the pump, and there is a problem that a relatively large amount of electric power is consumed with the operation of the electric motor.
Japanese Patent Publication No. 5-34054

  The problem to be solved is to obtain a steam heating device that does not require the operation of an electric motor and does not consume power.

  In the present invention, a suction means is connected to a heat exchange chamber for heating a heat exchange object, and a heating steam is supplied to the heat exchange chamber, and a liquid pump and a liquid tank are provided at an outlet of an ejector as a suction means. The liquid tank is disposed at a position higher than the ejector by a predetermined distance, and the liquid flowing down from the liquid tank to the ejector by the hydraulic head pressure is used as a drive fluid for the ejector.

  In the present invention, since the liquid tank is arranged at a position higher than the ejector by a predetermined distance, the liquid in the liquid tank can be supplied to the ejector with the water head pressure corresponding to this distance, and power is not consumed. .

  In the present invention, a liquid pump and a liquid tank are sequentially arranged at the outlet of the ejector. The liquid pump does not use an electric motor, but pumps liquid using high-pressure compressed air or steam as a pressure source. What can be done is preferred.

In this embodiment, an ejector 6 as a suction means and a reaction kettle 1 as a heat exchange chamber are connected, a liquid tank 8 is used above the ejector 6, and a liquid pressure pump 4 is used below the ejector 6. Indicates. A heat exchange material (not shown) housed in the reaction kettle 1 is heated by steam as a heating fluid supplied to the jacket portion 2 and the multitubular heat exchanger 3.

  A steam supply pipe 15 for heating is connected to the left side of the jacket portion 2. In the present embodiment, a cooling water supply pipe 14 as a cooling fluid is connected to the right side of the jacket portion 2 so that not only heating but also cooling can be performed. Valves 17 and 18 for controlling the supply amount are attached to the supply pipes 14 and 15, respectively.

  A jacket portion 2 is formed over substantially the entire outer periphery of the reaction kettle 1, and a discharge pipe 19 is attached to the lower left portion of the jacket portion 2 and connected to the suction port 12 of the ejector 6. In the discharge pipe 19, an opening / closing valve 20 and a steam trap 21 that does not discharge steam but can automatically discharge only condensate to the outlet side are arranged in parallel with the suction port 12 of the ejector 6. Connecting. A nozzle (not shown) is disposed inside the suction port 12. The diffuser part 7 of the ejector 6 is connected to the header tank 9. The header tank 9 temporarily stores a mixed fluid of a liquid discharged from the ejector 6 and a partial vapor. The lower part of the header tank 9 is connected to the liquid pressure pump 4 through a passage 10.

  The liquid pumping pump 4 has a liquid inlet 25, a liquid outlet 26, a high-pressure pumping fluid inlet 27 and a high-pressure pumping fluid outlet 28, and the liquid inlet 25 is connected to the bottom of the header tank 9 by the passage 10. To do. A check valve 29 that allows passage of fluid in only one direction is attached to the passage 10. The check valve 29 allows passage of fluid from the header tank 9 to the liquid pumping pump 4 and prevents passage in the opposite direction.

A liquid discharge pipe 31 is connected to the liquid outlet 26 of the liquid pressure feed pump 4 via a check valve 30, and a high pressure steam pipe 32 is connected to the high pressure pressure feed fluid inlet 27. On the other hand, the high-pressure pumping fluid discharge port 28 communicates with the side portion of the header tank 9 through the pressure equalizing pipe 33.

The liquid pump 4 closes the high-pressure pumping fluid inlet 27 and opens the high-pressure pumping fluid discharge port 28 when the float (not shown) disposed inside is located in the lower part, and accumulates in the header tank 9. The liquid is allowed to flow down into the liquid pump 4 through the check valve 29 and the liquid inlet 25. When liquid is accumulated in the liquid pumping pump 4 and a float (not shown) is located at a predetermined upper portion, the high-pressure pumping fluid discharge port 28 is closed, while the high-pressure pumping fluid introduction port 27 is opened, and the high-pressure steam pipe 32 is opened. Then, the high-pressure pressure-feeding steam is caused to flow into the inside, so that the liquid accumulated inside is pressure-fed to the upper liquid tank 8 through the liquid outlet 26, the check valve 30 and the liquid discharge pipe 31.

  When the liquid is pumped with high-pressure steam and the liquid level in the liquid pumping pump 4 is lowered, the high-pressure pumping fluid introduction port 27 is closed again, and the high-pressure pumping fluid discharge port 28 is opened again. Flow down to the inside. By repeating such an operation cycle, the liquid pumping pump 4 pumps the liquid from the header tank 9 to the liquid tank 8.

  A liquid supply pipe 13 is connected to the upper part of the liquid tank 8, and a pipe line 11 is connected to the lower part of the liquid tank 8 to connect to the nozzle inside the suction port 12 of the ejector 6. The liquid accumulated in the liquid tank 8 flows down in the nozzle of the ejector 6 by the water head pressure corresponding to the height up to the ejector 6, and generates a vacuum suction force according to the velocity energy. The predetermined fluid in 2 is aspirated.

A straight tubular multi-tube heat exchanger 3 as a heat exchange member is disposed inside the reaction kettle 1. The upper end of the multi-tube heat exchanger 3 is connected to the steam supply pipe 15 and the cooling water supply pipe 14, while the lower end opens into the jacket portion 2. The multi-tube heat exchanger 3 is made of a material having excellent heat transfer efficiency, such as a copper pipe.

  At the inner end of the reaction kettle 1, a convex resistance plate 5 whose height decreases in the vertical direction at a position facing the multitubular heat exchanger 3 is attached. In addition, a stirring blade 16 for stirring the heat exchanged material in the reaction kettle 1 is attached to the center of the reaction kettle 1. The stirring blade 16 is arranged so that the lower stirring blade 22 has a larger diameter and larger discharge force, and the upper stirring blade 23 has a smaller diameter and smaller discharge force.

  When heating or cooling the heat exchanged material in the reaction kettle 1, the stirring blade 16 is rotationally driven to stir the heat exchanged material. In addition to turning, the inside of the reaction vessel 1 is also turned in the vertical direction by enlarging the lower stirring blade 22 and reducing the upper stirring blade 23. In this way, the heat exchange material is efficiently and reliably turned by turning the heat exchange material in the horizontal direction and the vertical direction by the stirring blades 16, 22, and 23.

  The heat exchanged material swirled by the stirring blades 16, 22, and 23 collides with the resistance plate 5 and becomes a turbulent state, so that the outer surface of the multi-tube heat exchanger 3 and the jacket portion 2 side are in contact with each other. Contact opportunities increase and heat exchange efficiency can be improved.

  The lower agitating blade 22 is enlarged, the upper agitating blade 23 is made smaller, and the convex resistance plate 5 whose height decreases toward the lower side is attached, so that the heat exchange object collides with the resistance plate 5. The amount of turbulent flow generated in this manner can be made uniform in the vertical direction in the reaction kettle 1, and uneven heat transfer to the heat exchanged material can be prevented.

  When heating the heat exchanged material in the reaction kettle 1, the steam is reacted by supplying steam at a temperature suitable for heating from the steam supply pipe 15 to the jacket portion 2 and the multi-tube heat exchanger 3. Heat is applied to the heat exchanged material in the pot 1 to heat it. Condensate condensed with steam by heating and a part of the steam not condensed are sucked into the suction port 12 of the ejector 6 through the discharge pipe 19 and the steam trap 21 or the opening / closing valve 20 and reach the header tank 9.

  On the other hand, when cooling the heat exchanged material in the reaction kettle 1, cooling water having a temperature suitable for cooling is supplied from the cooling water supply pipe 14 to the jacket portion 2 and the multi-tube heat exchanger 3, By causing the liquid to flow down from the liquid tank 8 to the ejector 6 and generating the suction force by the ejector 6, the inside of the jacket portion 2 and the multi-tubular heat exchanger 3 are in a predetermined pressure state, for example, a vacuum state below atmospheric pressure. Thus, the cooling water takes the heat of the heat exchange material in the reaction vessel 1 and evaporates, whereby the heat exchange material can be vaporized and cooled by the latent heat of evaporation.

  The vaporized steam and the remaining cooling water evaporated and evaporated by taking the heat of the object to be cooled by the jacket part 2 and the multi-tube heat exchanger 3 are sucked into the ejector 6 from the on-off valve 20 and the steam trap 21 and reach the header tank 9. .

  By arranging the jacket part 2 and the multi-tube heat exchanger 3 as heat exchange members on both the outer periphery and the inside of the reaction kettle 1, the area for heat exchange can be increased, and the unit per unit time can be increased. A sufficient amount of heat exchange can be secured to improve heat exchange efficiency.

  By causing the liquid in the liquid tank 8 to flow down in the ejector 6 by the water head pressure, it is not necessary to drive the electric motor, and therefore no power is consumed.

The block diagram which shows the Example of the steam heating apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reaction kettle 2 Jacket part 3 Multipipe heat exchanger 4 Liquid pumping pump 5 Resistance plate 6 Ejector 8 Liquid tank 9 Header tank 12 Suction port 14 Cooling water supply pipe 15 Steam supply pipes 16, 22, and 23 Stirring blade 31 Liquid discharge tube

Claims (1)

A suction unit is connected to the heat exchange chamber for heating the heat exchange material, and a heating pump is supplied to the heat exchange chamber. A liquid pump and a liquid tank are sequentially arranged at the outlet of the ejector as the suction unit. In addition, the steam heating apparatus is characterized in that the liquid tank is disposed at a position higher than the ejector by a predetermined distance, and the liquid flowing down from the liquid tank to the ejector by the water head pressure is used as a driving fluid for the ejector.

Images