JPH0926109A - Low pressure steam heater by heating medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low pressure steam heating device using a heating medium capable of changing the heating steam temperature of a heating medium quickly. SOLUTION: A heating medium boiler 1 is connected to a jacket 6 of a reaction kiln 2 by way of a pressure control valve 8 and an air-liquid separator 9. The jacket 6 is connected to an ejector 20 of a vacuum pump means 7 by way of a pipeline 16. The vacuum pump means 7 comprises the ejector 20, a heat exchanger tank 21, a circulation pump 22 and their respective pipeline 23. The pipeline 23 is branched into pipelines 32 and 33 and connected to a tank 3. Both pipelines 32 and 33 are connected to the primary side of the air- liquid separator 9 of a heating steam pipeline 11 in the pipeline 35.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating medium for heating an object to be heated by steam of a heating medium, which is used in various heating processes in the petrochemical industry, the synthetic fiber industry, the synthetic resin industry and the like. The present invention relates to a steam heating device.

[0002]

2. Description of the Related Art As an example of a conventional steam heating device using a heat medium, one shown in FIG. 2 has been used.
This is to heat the medium to be heated in the reaction vessel 2 by supplying the heat medium vapor generated in the heat medium boiler-1 as the evaporator of the heat medium to the reaction vessel 2 which is a kind of heat exchanger. , The condensate of the heat medium vapor condensed by heating is caused to flow down into the tank 3,
It is collected in the boiler 1 by the circulation pump 4.

Although various kinds of heat mediums are commercially available and used, those having a lower pressure and a higher temperature are generally used as compared with the steam generated by boiling normal water, and the heating device is designed to withstand pressure. It can be heated at a relatively high temperature without being used, and is often used in various heating steps.

[0004]

When the conventional steam heating device using a heat medium is used, there is a problem that the heating temperature cannot be changed promptly. In particular, when the heating temperature of the heating medium vapor was lowered, it could not be changed promptly. This means that the steam pressure must be changed in order to change the temperature of the heat carrier steam, but the steam pressure generated in the evaporator or boiler or the steam pressure can be changed quickly by adjusting various valves. This is because it cannot be done. Further, in order to lower the heating temperature, it is necessary to lower the steam pressure, but in the above-mentioned conventional one, this decrease in steam pressure must wait until the object to be heated deprives the heat of condensation of the heated steam. Therefore, the heating temperature cannot be changed more quickly.

Therefore, a technical object of the present invention is to obtain a low-pressure steam heating device using a heat medium, which can rapidly change the steam heating temperature in heating the heat medium with steam.

[0006]

[Means for Solving the Problems] The technical means of the present invention taken to solve the above-mentioned technical problem is to connect a steam supply pipe of a heat medium to a primary side of a heat exchanger, In a device that recovers the condensed heat medium to a recovery destination such as an evaporator, a vacuum pump means is provided in series on the secondary side of the heat exchanger so that the vacuum degree of the vacuum pump means can be adjusted. Parts are arranged.

[0007]

The vapor heating temperature of the heat medium can be changed by connecting the vacuum pump means to the secondary side of the heat exchanger and arranging the vacuum degree adjusting section capable of adjusting the vacuum degree of the vacuum pump means. If you do, the vacuum degree of the vacuum pump means,
That is, the steam pressure and the steam temperature can be swiftly changed by adjusting the suction amount. By increasing the suction amount of the vacuum pump means,
The steam pressure can be reduced more quickly, and the steam heating temperature can be reduced at the same time. On the other hand, the steam pressure can be recovered and the steam heating temperature can be raised by reducing or almost eliminating the suction amount of the vacuum pump means.

[0008]

An embodiment showing a specific example of the above technical means will be described (see FIG. 1). In this embodiment, an example in which the reaction kettle 2 is used as a heat exchanger is shown, and the same members as those in the prior art shown in FIG.

The heating medium boiler 1 as an evaporator is connected to the jacket portion 6 of the reaction kettle 2 and the lower portion of the jacket portion 6 is connected to the vacuum pump means 7 so that the vacuum pump means 7 is circulated with the tank 3. Boiler for heat medium via pump 4
1 to form a low-pressure steam heating device using a heat medium.

The heating medium boiler 1 and the reaction vessel 2 are connected by a pressure adjusting valve 8, a gas-liquid separator 9 and a heating steam supply pipe 11 via a pressure sensor 10. The pressure adjusting valve 8 adjusts the steam pressure in the heating steam supply pipe 11 detected by the pressure sensor 10 to a predetermined value, and the gas-liquid separator 9 controls the heat medium in the heating steam supply pipe 11. The vapor and the liquid are separated, and only the separated vapor is supplied to the jacket portion 6 of the reaction kettle 2,
The liquid is discharged from the steam trap 12 provided below the liquid. The gas-liquid separator 9 may be of a collision type, a centrifugal type, a filter type, or the like.

A jacket portion 6 arranged on the outer periphery of the reaction kettle 2.
The lower connection port 13 is connected to the ejector 20 of the vacuum pump means 7 by a pipe line 16 in which a steam trap 14 and a bypass valve 15 are provided in parallel. Further, the outlet of the steam trap 12 of the gas-liquid separator 9 is connected to the ejector 20 via the conduit 17.

The vacuum pump means 7 includes an ejector 20, a heat exchange tank 21, a circulation pump 22, and a connection conduit 23.
It consists of and. The ejector 20 is formed of a nozzle portion 25 and a diffuser portion 26. A cooling pipe 28 for cooling the heat medium 27 accumulated therein is attached to the heat exchange tank 21 via a control valve 29, and the heat medium 2 is provided in the lower portion.
A temperature sensor 30 for detecting the fluid temperature of 7 is attached, and although not shown, the temperature sensor 30 and the control valve 2
9 are connected via a temperature controller, and the heat medium 27
So that the temperature can be maintained at a predetermined value. The vacuum pump means 7 circulates the heat medium 27 in the heat exchange tank 21 into the ejector 20 by the circulation pump 22, and the ejector 20
A suction force is generated by the nozzle portion 25 of FIG. 2 to suck the heat medium from the jacket portion 6 of the reaction kettle 2 and maintain the inside of the jacket portion 6 at a predetermined pressure state. In this embodiment, the heat exchange tank 21, the cooling pipe 28, the adjusting valve 29 and the temperature sensor 30 form a vacuum degree adjusting portion of the vacuum pump means 7. A heat medium supply pipe line 31 for supplying a heat medium is connected to the upper portion of the heat exchange tank 21.

A part of the connecting pipe line 23 of the vacuum pump means 7 is branched to connect the pipe line 32, and a part of the circulating heat medium is supplied to the pipe line 3.
3 is supplied to the tank 3, and a pipe 35 is further connected to inject a part of the circulating heat medium into the primary side of the gas-liquid separator 9 in the heating vapor supply pipe 11. Even when the heat transfer medium whose pressure is adjusted by the pressure adjusting valve 8 by the pipe line 35 becomes superheated steam, a part of the circulating heat transfer medium is injected and heat is exchanged in the gas-liquid separation unit 9 to obtain the saturation temperature. It can be steam.

Next, the operation will be described. Boiler for heat medium-1
The heat medium vapor generated in 1 is supplied to the jacket portion 6 of the reaction vessel 2 after being pressure-adjusted via the pressure adjustment valve 8. The inside of the jacket portion 6 is in a predetermined low pressure state due to the suction force of the ejector 20 of the vacuum pump means 7, and the heat medium vapor supplied to the jacket portion 6 becomes a predetermined pressure, that is, the vapor temperature and reacts. The object to be heated in the kettle 2 is heated. The heat medium vapor that has been heated and deprived of heat condenses into a liquid,
It is sucked by the ejector 20 through the steam trap 14 and reaches the heat exchange tank 21.

The heat medium 27 in the heat exchange tank 21 is cooled to a predetermined temperature by the cooling pipe 28 and supplied to the ejector 20 by the circulation pump 22 to suck the heat medium in the jacket portion 6 again. Since the suction force generated by the ejector 20 is determined by the temperature of the fluid passing through the ejector 20, the suction force of the ejector 20, that is, the suction force of the ejector 20, is adjusted by appropriately adjusting the liquid temperature of the heat medium 27 in the heat exchange tank 21. The degree of pressure reduction can be controlled. By controlling the suction force of the ejector 20, the pressure state inside the jacket portion 6 can be controlled, and the pressure inside the jacket portion 6 can be changed from a negative pressure state below atmospheric pressure to a positive pressure state above atmospheric pressure. Can be controlled.

For example, when a heat medium called Dowsum is used as the heat medium, the steam temperature is about 210 ° C. when the steam pressure is 0.3 kg in absolute pressure, and about 260 ° C. when 1.1 km is used. The steam temperature can be controlled by controlling the steam pressure.

In this embodiment, when the heating temperature in the jacket portion 6 is changed, the heating temperature should be promptly changed by adjusting the liquid temperature of the heat medium passing the suction force of the ejector 20. You can

In this embodiment, the reaction vessel 2 is used as the heat exchanger, but other heat exchangers such as synthetic fibers and synthetic resins, or heat exchangers for foods, medical products, etc. Can also be used as.

In this embodiment, the vacuum pump means 7 is composed of the ejector 20, the heat exchange tank 21 and the circulation pump 22. However, other vacuum pumps such as a water ring type, a rotary type and a reciprocating type vacuum pump are shown. Can also be used.

[0020]

As described above, according to the present invention, the pressure of the vacuum pump means can be adjusted to quickly change the heating steam pressure of the heating medium, that is, the heating steam temperature. A heating device can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a low-pressure steam heating device using a heat medium according to the present invention.

FIG. 2 is a configuration diagram showing a conventional steam heating device using a heat medium.

[Explanation of symbols]

 1 Boiler for heat medium 2 Reaction kettle 6 Jacket 7 Vacuum pump means 8 Pressure adjusting valve 9 Gas-liquid separator 14 Steam trap 20 Ejector 21 Heat exchange tank 22 Circulation pump

Claims (1)

[Claims] 1. A secondary side of a heat exchanger in which a steam supply pipe for a heat medium is connected to a primary side of the heat exchanger and the heat medium condensed by the heat exchanger is recovered to a recovery destination such as an evaporator. A low-pressure steam heating device using a heat medium, characterized in that a vacuum pump means is connected in series with the vacuum pump means, and a vacuum degree adjusting part capable of adjusting the vacuum degree of the vacuum pump means is arranged.