JP2013040735A - Heating device by low-pressure steam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating device by low-pressure steam, which does not use a boiler.SOLUTION: A heat exchanger 1 accommodating a heated object and a steam supply tube 3 which supplies heating steam from a condenser 9 of a heat pump 6 filling a heat medium in a closed loop by an evaporator 7, a compressor 8, the condenser 9, and a steam trap 10 to a jacket part 2 of the heat exchanger 1 are connected, a suction means 4 for sucking fluid in the jacket part 2 is connected to the jacket part 2 of the heat exchanger, and by keeping the inside of the jacket part 2 by the suction means 4 to the level of atmospheric pressure or a low-pressure state at atmospheric pressure or below, the heated object is heated by low-pressure steam. Heating steam from the condenser 9 of the heat pump 6 is supplied to the jacket part 2 of the heat exchanger 1, fluid in the jacket part 2 is sucked by the suction means 4 to keep the inside of the jacket part 2 to the level of atmospheric pressure or at a low-pressure state at atmospheric pressure or below, so that the heating device by the low-pressure steam, which does not use the boiler can be provided.

Description

The present invention relates to heating an object to be heated in a heat exchanger with low-pressure steam from a heating section of the heat exchanger, and particularly suitable for a case where the low-pressure steam temperature is a relatively low temperature of about 100 ° C. Relates to a heating device.

A conventional heating apparatus using low-pressure steam is disclosed in Patent Document 1, for example. This is connected to a heating unit of a heat exchanger that accommodates an object to be heated, a steam supply pipe that supplies steam for heating from a boiler, and a suction unit that sucks a fluid in the heating unit, and a suction unit Thus, the object to be heated is heated with low-pressure steam by maintaining the inside of the heating section at a low pressure state of about atmospheric pressure or below atmospheric pressure.

JP 2003-80003 A

The conventional low-pressure steam heating device uses steam from a boiler as heating steam, so that this low-pressure steam heating device cannot be used in a laboratory such as a university without a boiler facility. was there.

The problem to be solved is to provide a low pressure steam heating device that does not use a boiler.

The present invention supplies heating steam from a condenser of a heat pump in which a heating medium is filled in a closed loop of an evaporator, a compressor, a condenser, and an expander to a heating section of a heat exchanger that accommodates an object to be heated. And a suction means for sucking the fluid in the heating part is connected, and the heated part is maintained at a low pressure state of about atmospheric pressure or lower than atmospheric pressure by the suction means, so that the object to be heated is made of low-pressure steam. It is characterized by heating.

The present invention supplies the heating steam from the condenser of the heat pump to the heating part of the heat exchanger, sucks the fluid in the heating part with the suction means, and puts the inside of the heating part into a low pressure state of about atmospheric pressure or less than atmospheric pressure. By maintaining, an excellent effect that a heating device using low-pressure steam without using a boiler can be provided is produced.

It is a schematic block diagram of the heating apparatus by the low pressure steam concerning embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. A jacket portion 2 as a heating portion of the heat exchanger is integrally provided on the outer periphery of the heat exchanger 1 that accommodates an object to be heated, and the heating steam supply pipe 3 and the suction means 4 are connected to the jacket portion 2. The heat exchanger 1 has a cylindrical tank shape and accommodates an object to be heated (not shown) therein, and is integrally provided with a jacket portion 2 that covers the entire outer periphery of the side. A steam supply pipe 3 is connected above the jacket portion 2, and a pressure control valve 5 is disposed in the steam supply pipe 3. The steam supply pipe 3 supplies the steam for heating from the condenser 9 of the heat pump 6 to the jacket portion 2 of the heat exchanger 1.

The heat pump 6 includes an evaporator 7 that exchanges heat with a high-temperature heat source to evaporate the heat medium, a compressor 8 that compresses the heat medium evaporated by the evaporator 7, and a heat medium that is compressed by the compressor 8. It comprises a condenser 9 that exchanges heat with a low-temperature heat source and condenses the heat medium, and a steam trap 10 as an expander that expands the heat medium condensed in the condenser 9 and supplies it to the evaporator 7. A high temperature heat source supply pipe 11 that supplies a high temperature heat source to the evaporator 7 is connected to the evaporator 7, and a low temperature heat source supply pipe 12 that supplies a low temperature heat source to the condenser 9 is connected to the condenser 9. The low temperature heat source supply pipe 12 branches from the circulation path 21 of the suction means 4. In the heat pump 6, the heat medium evaporates in the evaporator 7, and the heat medium that has become a gas phase moves to the condenser 9 through the compressor 8. The gas phase heat medium that has moved to the condenser 9 is condensed into a liquid phase by the condenser 9, and the liquid phase heat medium returns to the evaporator 6 through the steam trap 10. The high temperature heat source supplied to the evaporator 7 from the high temperature heat source supply pipe 11 is exchanged with the liquid phase heat medium in the evaporator 7 and is led out from the low temperature heat source outlet pipe 13 as a low temperature heat source. The low-temperature heat source supplied from the low-temperature heat source supply pipe 12 to the condenser 9 is subjected to heat exchange with the gas phase heat medium in the condenser 9 and supplied as steam to the jacket portion 2 from the vapor supply pipe 3.

The ejector 15 of the suction means 4 is connected to the lower portion of the jacket portion 2 through the communication pipe 14. A steam trap 16 and a bypass valve 17 are attached to the communication pipe 14 in parallel. The lower end of the communication pipe 14 is connected to the suction chamber 18 of the ejector 15. The suction means 4 is constituted by an ejector type combination pump in which an ejector 15, a tank 19 and a circulation pump 20 are connected by a circulation path 21. A predetermined amount of warm water as a circulating fluid is stored in the tank 19, and this warm water is circulated from the ejector 15 to the tank 19 by the circulation pump 20, and a suction force is generated in the suction chamber 18 by the suction action of the ejector 15 to exchange heat. The inside of the jacket portion 2 of the vessel 1 is maintained at an atmospheric pressure as a predetermined pressure state or a negative pressure state below the atmospheric pressure. A circulating fluid supply pipe 22 is connected to the tank 19 via a valve 23, and a circulating fluid discharge pipe 24 is connected via a valve 25.

Since the suction force generated in the ejector 15 becomes a saturation pressure corresponding to the temperature of the fluid flowing down in the ejector 15, the fluid is replenished from the circulating fluid supply pipe 22 and the fluid temperature is appropriately adjusted, so that the ejector 15 The suction force can be arbitrarily controlled. For example, when a low-temperature steam of 80 ° C. is supplied into the jacket portion 2 to heat an object to be heated, suction of a pressure corresponding to the saturation pressure of the steam at a temperature where the suction force of the ejector 15 is slightly lower than 80 ° C. A predetermined temperature state can be maintained by adjusting the temperature of the circulating fluid so as to be a force. When the object to be heated in the heat exchanger 1 is heated, first, the bypass valve 17 is opened, the ejector-type combination pump 4 is driven, and the inside of the jacket portion 2 is in a predetermined low pressure state by the suction force of the ejector 15. Then, the steam for heating controlled to a predetermined pressure is supplied from the steam supply pipe 3 into the jacket portion 2 through the pressure control valve 5. Steam deprived of heat by heating the object to be heated is condensed and becomes condensed water, and is sucked into the ejector 15 from the steam trap 16 or the bypass valve 17 of the communication pipe 14 and reaches the tank 19.

  INDUSTRIAL APPLICATION This invention can be utilized for the heating apparatus by the low pressure steam which heats the to-be-heated object in a heat exchanger with the low pressure steam from the heating part of a heat exchanger.

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Jacket part 3 Steam supply pipe 4 Suction means 5 Pressure control valve 6 Heat pump 7 Evaporator 8 Compressor 9 Condenser 10 Steam trap 11 High temperature heat source supply pipe 12 Low temperature heat source supply pipe 13 Low temperature heat source derivation pipe 14 Communication pipe 15 Ejector 16 Steam trap 17 Bypass valve 18 Suction chamber 19 Tank 20 Circulation pump

Claims (1)

Supplying steam for heating from the heat exchanger containing the object to be heated and the condenser of the heat pump filled with the heat medium in the closed loop by the evaporator, compressor, condenser, and expander to the heating section of the heat exchanger By connecting a steam supply pipe to the heating section of the heat exchanger and a suction means for sucking the fluid in the heating section, and maintaining the inside of the heating section at a low pressure state of about atmospheric pressure or lower than atmospheric pressure by the suction means. A heating apparatus using low-pressure steam, wherein an object to be heated is heated by low-pressure steam.

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