JP4943224B2 - 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 steam for heating to the heat exchanger, and a suction means for sucking fluid in the heat exchanger, and cooled to the steam supply pipe. By connecting a water supply pipe, the superheat degree of the heating steam can be adjusted by the cooling water from the cooling water supply pipe.

In the conventional reduced pressure steam heating device, the cooling water is supplied from the upper part of the steam supply pipe. However, the steam for heating supplied to the heat exchanger cannot be reliably mixed with the steam. There was a problem that the overall degree of superheat of the material could not be adjusted uniformly.
JP 11-319544 A

  The problem to be solved is to obtain a reduced pressure steam heating apparatus capable of uniformly adjusting the overall superheat degree of steam supplied to the heat exchanger.

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 cooling water supply pipe is connected to the steam supply pipe. Connecting and adjusting the superheat degree of the heating steam by the cooling water supplied from the cooling water supply pipe , the steam supply pipe and the cooling water supply pipe are joined in the horizontal direction from the opposite direction in the mixing unit, respectively. By supplying the cooling water from the cooling water supply pipe in the opposite direction to the flow of the steam in the steam supply pipe , the steam and the cooling water are mixed while colliding .

  In the present invention, the cooling water is supplied from the cooling water supply pipe in the opposite direction to the flow of the steam in the steam supply pipe, so that the steam and the cooling water are mixed while colliding with each other, thereby ensuring the mixing. Thus, the overall superheat degree of the steam supplied to the heat exchanger can be adjusted uniformly.

  In the present invention, the steam from the steam supply pipe collides with the cooling water, and it is desirable to use a cooling water spray nozzle in order to supply the cooling water to the entire inside of the steam supply pipe.

  In FIG. 1, a reduced pressure steam heating apparatus is constituted by a reaction kettle 1 as a heat exchanger, a suction means 2, a heating steam supply pipe 3 and a cooling water supply pipe 6. The steam supply pipe 3 and the cooling water supply pipe 6 are joined to each other in the horizontal direction from the opposite direction in the mixing unit 4.

 The steam supply pipe 3 is connected to a steam source such as a boiler (not shown), and a steam pressure control valve 7 and an on-off valve 8 are attached to the steam supply pipe 3 and connected to the jacket portion 11 of the reaction kettle 1 as a heat exchanger via the mixing portion 4. To do.

 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 circulates the circulating water in the tank 5 through the circulation pump 15 to generate a suction force corresponding to the liquid temperature. A cooling water supply pipe 21 is connected to the upper part of the tank 5.

 The circulation path 16 is branched and the surplus water discharge pipe 9 and the cooling water supply pipe 6 are communicated. An open / close valve 10 is attached to the surplus water 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 cooling water supply pipe 6 supplies a part of the circulating water of the combination pump 2 to the mixing unit 4. A spray nozzle (not shown) is incorporated in the end of the cooling water supply pipe 6 on the mixing unit 4 side, When the superheated steam supplied from the steam supply pipe 3 collides with the cooling water, the temperature of the whole superheated steam is reduced to a uniform temperature. The steam reduced to a predetermined temperature by the mixing unit 4 is supplied to the jacket unit 11 via the pipe line 17.

 In the present embodiment, the cooling water supply pipe 6 is shown as a part of the circulating fluid of the suction means 2 that is branched and supplied. However, the water in the cooling water supply pipe 6 is not limited to the circulating fluid, Cooling water at a separate temperature can also be used.

 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, when a part of the circulating water of the suction means 2 is supplied from the cooling water supply pipe 6 into the superheated steam from the mixing unit 4, the superheated steam is reduced to the saturated temperature steam. The amount of cooling water supplied from the cooling water supply pipe 6 can be controlled by appropriately adjusting the opening degree of the valve means 19.

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 Suction means 3 Steam supply pipe 4 Mixing part 5 Tank 6 Cooling water supply pipe 11 Jacket part 14 Ejector 15 Circulation pump 16 Circulation path 17 Pipe line 19 Valve means

Claims (1)

A heat exchanger, a steam supply pipe for supplying steam for heating to the heat exchanger, a suction means for sucking a fluid in the heat exchanger, and a cooling water supply pipe connected to the steam supply pipe; In the case where the superheat degree of the heating steam is adjusted by the cooling water supplied from the cooling water supply pipe, the steam supply pipe and the cooling water supply pipe are joined in the horizontal direction from opposite directions in the mixing section, A reduced pressure steam heating apparatus , wherein steam and cooling water are mixed while colliding by supplying cooling water from a cooling water supply pipe in a direction opposite to the flow of steam.

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