JPH0979514A - Low-pressure steam heater by heating medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a low-pressure steam heater by heating medium which makes it possible to rapidly alter the heating steam temperature of the medium. SOLUTION: A boiler 1 for heating medium is connected to the jacket 6 of a reaction kiln 2 via a pressure regulating valve 8 and a vapor-liquid separator 9. The jacket 6 is connected to the ejector 20 of a vacuum pump 7 via a pipeline 16. The pump 7 has the ejector 20, a heat exchange tank 21, a circulation pump 22 and their connecting pipeline 23. The heat absorber 36 of a Y- shaped heat pipe 34 is disposed in the tank 21. The radiator 37 of the pipe 34 is disposed in the tank 3, and the other radiator 38 is disposed in a cooling liquid tank 39.

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 a conventional steam heating apparatus using a heat medium, a heat medium steam generated in a heat medium boiler as an evaporator of the heat medium is supplied to a heat exchanger to heat the inside of the heat exchanger. What heated the thing and collect | recovered the heat medium condensed by heating to the condensate tank was used.

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 highly resistant to heat. It can be heated at a relatively high temperature without pressure design, and is widely used in various heating processes.

[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 the case where the condensed heat medium is recovered from the condensate tank to a recovery destination such as an evaporator, a vacuum pump consisting of an ejector, a heat exchange tank, and a circulation pump is connected in series on the secondary side of the heat exchanger. The heat absorption part at one end of the heat pipe is arranged in the heat exchange tank, and the other end of the heat pipe is at least 2
One heat radiating portion is arranged in the condensate tank, and the other heat radiating portion is arranged in the cooling liquid.

[0007]

[Operation] By arranging a vacuum pump consisting of an ejector, a heat exchange tank, and a circulation pump on the secondary side of the heat exchanger, and arranging the heat absorbing portion of the heat pipe in the heat exchange tank,
When changing the steam heating temperature of the heat medium, the steam pressure is quickly changed by adjusting the vacuum degree of the vacuum pump, that is, the heat absorption amount of the heat pipe in the heat exchange tank, and at the same time, the steam temperature is also changed. Can be changed promptly. By increasing the amount of cooling liquid in the heat radiation part at the other end of the heat pipe to lower the liquid temperature of the heat medium in the heat exchange tank, the suction force of the ejector part is increased and the suction amount of the vacuum pump is increased. Therefore, the heating steam pressure can be lowered more quickly, and at the same time, the steam heating temperature can be lowered. On the other hand, unless the heat absorption amount in the heat exchange tank is reduced to lower the liquid temperature of the heat medium in the heat exchange tank, the suction amount of the vacuum pump is reduced or almost eliminated,
By recovering the steam pressure, it is possible to raise the steam heating temperature of the heat medium.

By disposing one of the heat radiating portions of the heat pipe in the condensate tank, it is possible to heat the heat medium recovered in the recovery destination such as the evaporator by the heat radiation of the heat radiating portion, that is, the heating action. Energy loss can be prevented.

[0009]

EXAMPLES Examples showing specific examples of the above technical means will be described. In FIG. 1, a heat medium boiler-1 as an evaporator is connected to a jacket portion 6 of a reaction kettle 2 as a heat exchanger, and the lower portion of the jacket portion 6 is connected to a vacuum pump 7 so that the vacuum pump 7 is It is connected to the heat medium boiler-1 via the tank 3 and the pump 4 to form a low-pressure steam heating device using the 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 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 7 is composed of an ejector 20, a heat exchange tank 21, a circulation pump 22 and a connecting conduit 23. The ejector 20 has a nozzle portion 25 and a diffuser.
It is formed by the section 26.

A Y-shaped heat pipe 3 is placed in the heat exchange tank 21.
The heat absorbing portion 36 at one end of No. 4 is arranged. Two heat radiating portions 37, 38 are formed on the upper end of the heat pipe 34, and one heat radiating portion 37 is arranged in the tank 3 and the other heat radiating portion 38 is arranged.
Is placed in the cooling liquid tank 39 into which the cooling liquid is injected. A cooling liquid supply pipe 40 for supplying the cooling liquid to the cooling liquid tank 39.
The cooling liquid discharge pipe 41 for discharging and the flow rate adjusting valves 42 and 43 for adjusting the flow rate are connected. Heat pipe 3
Numeral 4 absorbs heat by absorbing heat from the surrounding fluid in the heat absorbing portion 36,
The vaporized substance contained therein evaporates and reaches the heat dissipation parts 37, 38,
The heat radiating portions 37 and 38 heat the surrounding fluid to radiate the heat, the evaporated substance is condensed, and the built-in wick flows down by the capillary phenomenon to reach the heat absorbing portion 36, which is a well-known method.

A temperature sensor 30 for detecting the temperature of the heat medium 27 is attached to the lower portion of the heat exchange tank 21, and although not shown, the temperature sensor 30 and the coolant flow rate control valve 4 are provided.
2, 43 are connected through a temperature controller so that the temperature of the heat medium 27 can be maintained at a predetermined value.

In the vacuum pump 7, the circulation pump 22 circulates the heat medium 27 in the heat exchange tank 21 into the ejector 20, and the nozzle portion 25 of the ejector 20 produces a suction force corresponding to the temperature of the heat medium 27. The heat medium is generated and the heat medium is sucked from the jacket portion 6 of the reaction kettle 2, and the inside of the jacket portion 6 is maintained at a predetermined pressure state. The liquid temperature of the heat medium 27 can be lowered by increasing the supply amount of the cooling liquid from the cooling liquid flow rate control valve 42.

A part of the connecting pipe line 23 of the vacuum pump 7 is branched to connect the pipe line 32 so that a part of the circulating heat medium is supplied from the pipe line 33 to the tank 3. Three
5 to connect a part of the circulating heat medium to the heating steam supply pipe 11
It is injected into the primary side of the gas-liquid separator 9 therein. 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 by the suction force of the ejector 20 of the vacuum pump 7, and the heat medium vapor supplied to the jacket portion 6 reaches a predetermined pressure, that is, the vapor temperature, in the reaction vessel. The object to be heated in 2 is heated. The heat medium vapor that has been heated and deprived of heat condenses into a liquid, 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 by being absorbed by the heat absorbing portion 36 of the heat pipe 34, and the absorbed heat is radiated by the heat radiating portion 38 of the cooling liquid tank 39. On the other hand, when the liquid temperature of the circulating heat medium 27 in the tank 3 is low, a part of the evaporation material in the Y-shaped heat pipe 34 reaches the heat radiating portion 37 to heat the circulating heat medium 27.

Heat exchange tank 21 cooled to a predetermined temperature
The heat medium 27 in the inside is supplied to the ejector 20 by the circulation pump 22, and again sucks the heat medium in the jacket portion 6 of the reaction vessel 2. Since the suction force generated in the ejector 20 is determined by the temperature of the fluid passing through the ejector 20,
By appropriately adjusting the liquid temperature of the heat medium 27 in the heat exchange tank 21, the suction force of the ejector 20, that is, 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 product named Dowsum is used as the heat medium, the steam temperature becomes about 210 ° C. when the steam pressure is 0.3 kg in absolute pressure, and about 260 ° C. when it is 1.1 km. 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 is promptly changed by adjusting the liquid temperature of the heat medium 27 passing through the suction force of the ejector 20. be able to.

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.

[0023]

As described above, according to the present invention, the heat absorbing portion of the heat pipe is arranged in the heat exchange tank, and the heat absorption amount is adjusted to control the liquid temperature of the heat medium, thereby ejecting the vacuum pump. It is possible to obtain a low-pressure steam heating device using a heating medium, which can quickly change the heating steam pressure of the heating medium, that is, the heating steam temperature by adjusting the degree of vacuum of the − part.

Further, by disposing one heat radiating portion of the heat pipe in the circulating heat medium tank, when the temperature of the heat medium is low, the heat medium is heated and recovered to a recovery destination such as a boiler. Therefore, the loss of heat energy can be prevented.

[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.

[Explanation of symbols]

 1 Boiler for heat medium 2 Reaction kettle 3 Tank 6 Jacket 7 Vacuum pump 8 Pressure adjusting valve 9 Gas-liquid separator 20 Ejector 21 Heat exchange tank 22 Circulation pump 27 Heat medium 34 Y-type heat pipe 36 Heat absorbing part 37, 38 Radiator 39 Coolant tank 40 Coolant supply pipe 42 Coolant flow control valve

Claims (1)

[Claims] 1. A heat exchanger in which a steam supply pipe for a heat medium is connected to the primary side of the heat exchanger and the heat medium condensed by the heat exchanger is recovered from a condensate tank to a recovery destination such as an evaporator. A vacuum pump consisting of an ejector, a heat exchange tank, and a circulation pump is installed on the secondary side of the vacuum pump, and the heat absorption section at one end of the heat pipe is arranged in the heat exchange tank of the vacuum pump.
Form the other end of the pipe with at least two heat dissipation parts,
While arranging one heat radiation part in the condensate tank,
A low pressure steam heating device using a heat medium, characterized in that the other heat radiating portion is arranged in the cooling liquid.