JPH09250705A - Pressure reduction steam generating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure reduction steam generating device to eliminate a need for the feed of cooling water for regulating the degree of reduction of a pressure. SOLUTION: A jacket part 5 is connected to a steam feed pipe 3 through a steam ejector 2. The lower part of the jacket part 5 is connected to an ejector 16 of a combination pump 15. The combination pump 15 is comprised by the ejector 16, a tank 17, and a re-circulation pump 18. The upper part of the tank 17 is connected to a suction chamber 8 of the steam ejector 2 through a line 19 and a valve 20. Condensate in the tank 17 is vaporized through the suction force of the steam ejector 2 and condensate is cooled by a heat of vaporization.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heater for heating an object to be heated by generating steam at a relatively low temperature of about 100 ° C. or less, and is used in the petrochemical industry, synthetic fiber industry, synthetic resin industry, etc. The present invention relates to a reduced pressure steam generator used in various heating processes.

[0002]

2. Description of the Related Art As a conventional reduced pressure steam generator, for example, the one disclosed in Japanese Patent Publication No. 7-88933 has been used. This is connected to the steam supply pipe on the primary side of the indirect heating container, and connected to the secondary side is an ejector vacuum pump consisting of an ejector, an open tank and a spiral pump.
By supplying cooling water into the open tank to bring it to a predetermined fluid temperature, the degree of vacuum, that is, the degree of pressure reduction can be adjusted, and the object to be heated can be heated with relatively low-temperature steam of about 100 ° C. or less. It is a thing.

[0003]

When the above conventional reduced pressure steam generator is used, cooling water must be supplied almost continuously into the tank in order to adjust the degree of pressure reduction, and a large amount of cooling water is required. There was a problem I needed. In particular, in order to increase the degree of pressure reduction, it was necessary to supply a large amount of cooling water because the fluid temperature had to be extremely low.

Therefore, a technical object of the present invention is to obtain a reduced pressure steam generator capable of reducing the amount of cooling water supplied to a tank or making it unnecessary.

[0005]

Means for Solving the Problems The means of the present invention taken to solve the above-mentioned problems is to connect a steam supply pipe to the primary side of a heat exchanger and to connect an ejector and a tank to the secondary side of the heat exchanger. And a suction means having a circulation pump connected in series,
Place a steam ejector in the steam supply pipe to
The inlet side of the mue ejector is connected to the steam supply pipe, the outlet side is connected to the heat exchanger, and the suction chamber of the steam ejector is connected to the upper part of the tank.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION By connecting a steam ejector to a steam supply pipe and connecting its outlet side to a heat exchanger,
When supplying steam for heating to the heat exchanger, a suction force is always generated in the suction chamber of the steam ejector. On the other hand, the suction force extends to the tank by connecting the suction chamber and the upper part of the tank. Condensate of steam that has condensed by heating the object to be heated by the heat exchanger flows into the tank, but since the pressure inside the tank is reduced due to the suction force of the steam ejector, the condensed water evaporates vigorously. It is cooled by the heat of vaporization. The vaporized vapor is sucked by the steam ejector, mixed with the vapor for heating, and supplied again to the heat exchanger.

[0007]

EXAMPLE In this example, a reaction vessel 1 was used as a heat exchanger.
Here is an example using. A steam supply pipe 3 is connected to the primary side of the reaction kettle 1 via a steam ejector 2, and an outlet side of the steam ejector 2 is connected to a jacket portion 5 of the reaction kettle 1 via a pipe line 4. An opening / closing valve 6 and a pressure control valve 7 are attached to the steam supply pipe 3 and connected to the nozzle portion in the suction chamber 8 of the steam ejector 2, and the diffuser 9 is connected to the pipe line 4. An on-off valve 10 is attached to the pipe line 4, and a branch pipe 11 and an on-off valve 12 are attached to enable communication with the atmosphere.

An opening / closing valve 13 and a steam trap 14 are connected in parallel to the lower portion of the jacket portion 5 and are connected to an ejector 16 of a combination pump 15 as suction means. The combination pump 15 includes an ejector 16, a tank 17 and a circulation pump 18. The liquid in the tank 17 is circulated in the circulation passage 21 by the circulation pump 18, and suction force is generated in the ejector 16 part. The upper part of the tank 17 and the suction chamber 8 of the steam ejector 2 are connected to each other via a conduit 19 and a valve 20. A replenishment water pipe 22 for replenishing circulating water and an overflow pipe 24 for performing an overflow by opening a valve 23 are attached to the upper part of the tank 17.

The circulation path 21 is branched and a surplus water discharge pipe 25 is attached. On-off valves 26 and 27 are attached to the suction port and the discharge port of the circulation pump 18, respectively.

The opening / closing valve 6 of the steam supply pipe 3 is opened to open the steam pipe.
Steam for heating is supplied from the mue ejector 2 to the jacket 5 of the reaction kettle 1. In this case, the pressure control valve 7 adjusts the pressure to a desired value, that is, the temperature. The steam supplied to the jacket portion 5 is condensed by heating the object to be heated in the reaction kettle 1 to become condensed water, and the steam trap 14
Is sucked into the ejector 16 of the combination pump 15,
Reach tank 17.

Since the tank 17 is sucked by the steam ejector 2, a part of the condensed water in the tank 17 evaporates and is cooled by its heat of vaporization. The condensate that has reached a predetermined temperature and has accumulated in the tank 17 is sucked by the circulation pump 18 and reaches the ejector 16 from the circulation path 21 to reach the jacket portion 5.
Aspirate the condensate inside.

Since the suction force generated by the ejector 16 becomes a saturated pressure with respect to the temperature of the fluid flowing in the ejector 16, the suction force increases when the temperature of the fluid is lowered, and the suction force decreases when the temperature of the fluid is raised.

Before supplying steam from the steam supply pipe 3 to the jacket part 5, while supplying steam to the steam ejector 2, the opening / closing valve 12 is opened and the opening / closing valve 10 is closed, and
The steam ejector 2 is opened by opening the on-off valve 13.
With this suction force, the residual air in the jacket portion 5 and the tank 17 can be discharged into the atmosphere together with the steam from the branch pipe 11, and the inside of the jacket portion 5 and the tank 17 can be kept in a predetermined depressurized state.

[0014]

As described above, according to the present invention, since the temperature of the fluid in the tank can be lowered by the suction force of the steam ejector, it is not necessary to separately supply cooling water.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a reduced pressure steam generator of the present invention.

[Explanation of symbols]

 1 Reactor 2 Steam Ejector 3 Steam Supply Pipe 5 Jacket 8 Suction Chamber 15 Combination Pump 16 Ejector 17 Tank 18 Circulation Pump 19 Pipeline

Claims (1)

[Claims] 1. A steam supply pipe is connected to a primary side of a heat exchanger, and a suction means having an ejector, a tank and a circulation pump is connected to a secondary side of the heat exchanger. A decompression characterized in that a mue ejector is arranged, the inlet side of the steam ejector is connected to the steam supply pipe, the outlet side is connected to a heat exchanger, and the suction chamber of the steam ejector is connected to the upper part of the tank Steam generator.