JP5546962B2 - 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 for a case where the heating steam temperature is a relatively low temperature of about 100 degrees C.

 A conventional reduced pressure steam heating apparatus 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 steam supply pipe is connected with steam. By connecting the fluid supply pipe and the valve means via a trap, the degree of superheat of the heating steam can be adjusted by the fluid from the fluid supply pipe.

  In the conventional reduced pressure steam heating apparatus, a part of the condensate stays in the steam supply pipe without reliably sucking the condensate condensed with the steam from the steam trap interposed in the steam supply pipe. Then, the condensate condensate is supplied to the heat exchanger, and there is a problem that temperature unevenness occurs inside the heat exchanger.

JP 11-319544 A

  The problem to be solved is to obtain a reduced-pressure steam heating apparatus that does not cause temperature unevenness in the heat exchanger so that condensate is reliably sucked out of the steam trap interposed in the steam supply pipe. .

  The present invention connects 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, and a steam trap is interposed in the steam supply pipe. Connecting the fluid supply pipe and the valve means to adjust the superheat degree of the steam for heating by the fluid from the fluid supply pipe, connecting the liquid ejector to the fluid supply pipe, and the suction chamber of the liquid ejector Is connected to the outlet side of the steam trap.

  In the present invention, the liquid ejector is connected to the fluid supply pipe, and the suction chamber of the liquid ejector is connected to the outlet side of the steam trap, so that the condensate is reliably discharged from the outlet side of the steam trap by the suction force of the liquid ejector. Can be aspirated and eliminated.

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

  In the present invention, a liquid ejector is connected to a fluid supply pipe, and a conventionally known liquid ejector can be used.

  In FIG. 1, a reaction vessel 1 as a heat exchanger, a suction means 2, a heating steam supply pipe 3, a gas-liquid separator 4, a steam trap 25 attached to the lower part of the gas-liquid separator 4, and a steam supply pipe 3 The fluid supply pipe 6 that communicates and reduces the temperature of the superheated steam to the saturation temperature steam and the liquid ejector 20 connected to the fluid supply pipe 6 constitute a vacuum steam heating apparatus.

 The steam supply pipe 3 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, a fluid supply pipe 6 is connected, and a gas-liquid separator 4 is further attached to the heat exchanger. It connects with the jacket part 11 of the reaction kettle 1 as follows.

  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.

 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 liquid ejector 20, a strainer 18, and a valve means 19 are attached on the way. The suction chamber 22 of the liquid ejector 20 is connected to the outlet side of the vapor trap 25 via a pipe line 24.

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 liquid ejector 20 via a conduit 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. A cooling fluid supply pipe 21 is connected to the upper part of the tank 5 of the suction means 2.

 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 superheated material in the reaction vessel 1 and separated. Liquid or condensate is drawn through the vapor trap 25 into the liquid ejector 20.

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 20 Liquid ejector 23 Cooling fluid supply pipe

Claims (1)

Connects the heat exchanger, the gas-liquid steam supply pipe for supplying steam for heating through the separator to the heat exchanger, the first ejector constituting a suction means for sucking the fluid in the heat exchanger ,
Connecting the fluid supply pipe and the valve means to the steam supply pipe on the inlet side of the gas-liquid separator via a steam trap connected to the lower part of the gas-liquid separator ;
In what adjusts the superheat degree of the heating steam supplied from the steam supply pipe to the heat exchanger via the gas-liquid separator by the fluid from the fluid supply pipe ,
Connect the liquid ejector of the second ejector in the fluid supply tube,
The suction chamber of the liquid ejector connected to the outlet side of the steam trap,
A reduced-pressure steam heating apparatus , wherein the condensate separated by the gas-liquid separator is sucked by the liquid ejector through the steam trap .

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