JP2013154268A - Reduced pressure steam heating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a reduced pressure steam heating apparatus which can optionally control the temperature of liquid in a tank only by supplying a small amount of a cooling fluid.SOLUTION: A steam supply pipe 3 is connected to a jacket part 11 of a reaction vessel 1. A suction means 2 is connected to a lower part of the jacket part 11. The suction means 2 is constituted of an ejector 14, a tank 5, and a circulating pump 15. A circulating liquid exhaust nozzle 27 spouting circulating liquid in the shape of a shower is arranged in an upper part of the tank 5. A heat pipe 28 having a heat sink and a radiator is attached to the circulating liquid exhaust nozzle 27. While the circulating liquid is spouted in the shape of a shower from the circulating liquid exhaust nozzle 27, a part of heat quantity reserved in the circulating liquid is released to the air so that the liquid temperature of the circulating liquid can be decreased.

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 for a case where the heating steam temperature is a relatively low temperature of about 100 degrees C.

 A conventional reduced pressure steam heating device is connected to a heat exchanger, a steam supply pipe for supplying steam for heating to the heat exchanger, and a suction means for sucking fluid in the heat exchanger, and the suction means is an ejector. By constituting a tank and a circulation pump and connecting a cooling fluid supply pipe to the upper part of the tank, the temperature of the liquid in the tank can be arbitrarily controlled.

  The conventional vacuum steam heating apparatus has a problem that a large amount of cooling fluid has to be replenished in order to lower the temperature of the liquid in the tank to an arbitrary temperature.

JP 11-319544 A

  The problem to be solved is to obtain a reduced-pressure steam heating apparatus that can arbitrarily control the temperature of the liquid in the tank only by replenishing a small amount of cooling fluid.

  The present invention relates to a heat exchanger, a steam supply pipe for supplying heating steam to the heat exchanger, and a suction means for sucking fluid in the heat exchanger. The suction means is a liquid ejector and a tank. And a circulation pump to circulate the liquid in the tank from the liquid ejector to the tank with the circulation pump, and arrange a circulation liquid jet outlet for jetting the circulation liquid in a shower shape above the tank. A heat pipe having a heat absorbing part and a heat radiating part is attached to the jet outlet, the heat absorbing part is arranged inside the circulating liquid jet outlet, and the heat radiating part is arranged outside the circulating liquid jet outlet, that is, in the atmosphere.

  In the present invention, since the circulating liquid outlet is disposed in the upper part of the tank, the circulating liquid is partially supplied from the circulating liquid outlet to the tank in a shower-like manner. Is radiated to the atmosphere, the temperature of the circulating liquid can be lowered, and the replenishment amount of the cooling fluid can be reduced. In addition, by attaching a heat pipe having a heat absorbing part and a heat radiating part to the circulating liquid outlet, the heat of the circulating liquid accumulated in the circulating liquid outlet is radiated to the outside atmosphere by the heat pipe, thereby circulating. The liquid temperature of the liquid can be lowered, and the replenishment amount of the cooling fluid can be reduced.

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

  In the present invention, a circulating liquid outlet is arranged at the upper part of the tank. However, this circulating liquid outlet may be a single outlet, or a large number of small diameters may be gathered together. It can also be an exit.

In FIG. 1, a pressure reducing steam heating apparatus is constituted by a reaction kettle 1 as a heat exchanger, a suction means 2 comprising an ejector 14, a tank 5, and a circulation pump 15, and a circulating liquid jet outlet 27 arranged at the upper part of the tank 5. To do.

 A steam supply pipe 3 that supplies steam for heating to the reaction kettle 1 is connected to a steam source such as a boiler (not shown), a steam pressure control valve 7 and an on-off valve 8 are attached, and one end of the fluid supply pipe 6 is connected. Further, a gas-liquid separator 4 is attached and connected to the jacket portion 11 of the reaction vessel 1.

  A cooling fluid supply pipe 23 is connected to the upper right portion of the jacket portion 11. By supplying a cooling fluid from the cooling fluid supply pipe 23 to the jacket portion 11, the reaction kettle 1 can be cooled instead of being heated.

 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.

  A circulating liquid outlet 27 for ejecting the circulating liquid in a shower shape is disposed at the upper part of the tank 5. The circulating liquid spout 27 ejects the circulating liquid into the tank 5 in a shower shape from a plurality of spouts provided on the lower surface in a substantially inverted triangular shape, as indicated by arrows. While the circulating liquid is ejected in a shower-like manner, a part of the heat quantity of the circulating liquid is radiated to the atmosphere, the liquid temperature of the circulating liquid can be lowered, and the replenishment amount of the cooling fluid Can be reduced.

  A rod-shaped heat pipe 28 having a heat absorbing portion and a heat radiating portion is attached to the side surface of the circulating liquid outlet 27. The heat absorption part of the heat pipe 28 is arranged inside the circulating liquid outlet 27, while the heat radiating part of the heat pipe 28 is arranged outside the circulating liquid outlet 27, that is, in the atmosphere.

 The circulation path 16 is branched to connect the surplus fluid discharge pipe 9 and the fluid supply pipe 6. An open / close 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).

 The fluid supply pipe 6 supplies a part of the circulating fluid of the combination pump 2 from the upper part of the steam supply pipe 3 in the direction of the arrow, and a strainer 18 and a valve means 19 are attached on the way.

The strainer 18 attached to the fluid supply pipe 6 is generally called a Y-type strainer, and has a screen member made up of a cylindrical stencil plate and a screen mesh inside. By flowing down, foreign matter such as rust and scale mixed in the fluid can be removed, and only the fluid from which the foreign matter has been removed can flow down to the valve means 19 side.

An automatic opening / closing valve 26 is connected to the blow passage 17 of the strainer 18. The blow passage 17 communicates with the inlet side of the strainer 18, and foreign matter that has been scraped off by the screen member and attached to the inner wall of the screen member can be removed from the blow passage 17 to the outside. Therefore, by opening the automatic opening / closing valve 26, the fluid flowing into the strainer 18 blows foreign matter adhering to the screen member and is removed from the system from the blow passage 17 and the automatic opening / closing valve 26.

 The gas-liquid separator 4 is disposed between the fluid supply pipe 6 and the jacket portion 11 of the reaction kettle 1. The gas-liquid separator 4 may be of a conventionally used type, and can be appropriately used such as one using centrifugal force, one that collides against a collision plate, one that uses a filter, or the like. A vapor trap 25 is attached to the lower part of the gas-liquid separator 4 and communicates with the tank 5 via a pipeline 24. The steam trap 25 is a kind of automatic valve that allows only steam to flow down without passing steam, and discharges the steam as a liquid separated by the gas-liquid separator 4 to the outlet side. It is.

 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.

In this case, the steam for heating is depressurized to a predetermined pressure by the steam pressure control valve 7, but even if the pressure is depressurized, the amount of heat possessed hardly decreases, so that the depressurized steam is superheated steam. Become. However, by supplying a part of the circulating fluid from the fluid supply pipe 6 into the superheated steam, the temperature of the superheated steam is reduced to the saturation temperature steam before flowing down the gas-liquid separator 4. The amount of fluid supplied from the fluid supply pipe 6 can be controlled by appropriately adjusting the opening degree of the valve means 19.

 In the gas-liquid separator 4, the mixed fluid of the circulating fluid and the steam is separated into gas and liquid, and the steam having reached the saturation temperature is supplied to the jacket portion 11 to heat the object to be heated in the reaction vessel 1 and separated. The liquid or condensate flows down to the tank 5 through the vapor trap 25.

  While the circulating liquid is ejected from the circulating liquid outlet 27 in the form of a shower, a part of the amount of heat held by the circulating liquid is radiated to the atmosphere, and the liquid temperature of the circulating liquid can be lowered. The amount of replenishment can be reduced.

DESCRIPTION OF SYMBOLS 1 Reaction kettle 2 Suction means 3 Steam supply pipe 4 Gas-liquid separator 5 Tank 6 Fluid supply pipe 11 Jacket part 14 Ejector 15 Circulation pump 17 Blow passage 18 Strainer 19 Valve means 27 Circulating liquid jet outlet 28 Heat pipe

Claims (1)

 In the heat exchanger, a steam supply pipe for supplying steam for heating to the heat exchanger, and a suction means for sucking the fluid in the heat exchanger, the suction means is composed of a liquid ejector, a tank, and a circulation pump. The liquid in the tank is circulated from the liquid ejector to the tank by a circulation pump, and the circulation liquid outlet for ejecting the circulation liquid in a shower-like manner is arranged at the upper part of the tank, and the circulation liquid outlet is endothermic. A reduced pressure steam heating apparatus, wherein a heat pipe having a heat radiating portion and a heat radiating portion is attached, the heat absorbing portion is disposed inside the circulating liquid jet port, and the heat radiating portion is disposed outside the circulating liquid jet port, that is, in the atmosphere. .

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