JP2013154267A - Low-pressure steam heating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-pressure steam heating apparatus allowing reduction of the amount of cooling water.SOLUTION: A steam supply pipe 8 for heating is connected to a jacket portion 2 of a reactor 1. A combination vacuum pump 4 is connected to the lower part of the jacket portion 2. The combination vacuum pump 4 is composed of a circulation pump 14, an ejector 10 and a circulation water tank 13. A heat pump 3 is composed of a compressor 5, a condenser 6, a steam trap 9 and an evaporator 13. Because the circulation water in the circulation water tank 13 of the combination vacuum pump 4 is cooled in an evaporation pipe 21 of the heat pump 3, the combination vacuum pump 4 does not require replenishment of fresh cooling water, allowing the reduction of the amount of cooling water used in the combination vacuum pump 4.

Description

  The present invention relates to a low-pressure steam heating apparatus that heats a heat exchange object with low-pressure steam in a heat exchange chamber.

 The steam heating apparatus heats an object to be heated with steam by connecting a heat exchange fluid supply pipe and suction means to the heat exchange chamber and supplying steam for heating from the heat exchange fluid supply pipe to the heat exchange chamber. It is something that can be done.

Japanese Patent No. 3170669

 The conventional steam heating apparatus has a problem that a large amount of cooling water must be supplied from the cooling fluid supply pipe in order to maintain the temperature of the circulating water in the tank at a predetermined value.

 The problem to be solved by the present invention is to provide a low-pressure steam heating device capable of reducing the amount of cooling water supplied into the tank.

 The present invention includes a heat exchanger that accommodates an object to be heated, a heat pump filled with a heat medium in a closed loop of an evaporator, a compressor, a condenser, and an expander, and a heating unit of the heat exchanger using the condenser of the heat pump. The steam supply pipe for supplying steam to the heating medium is heated by exchanging heat with the heat medium, and a suction means for sucking the fluid in the heating section is connected to the heating section of the heat exchanger, and the inside of the heating section is about atmospheric pressure by the suction means. Or while maintaining the low pressure state below atmospheric pressure, the circulating liquid circulating through the suction means is cooled by exchanging heat with the heat medium in the evaporator of the heat pump.

 The low-pressure steam heating device of the present invention cools a small amount of circulating water as a circulating liquid to a predetermined temperature with a heat pump by cooling the circulating liquid circulating through the suction means with a heat pump and cooling it with a heat medium. Can be used repeatedly, and the amount of cooling fluid required can be reduced.

The block diagram which shows the Example of the low pressure steam heating apparatus of this invention.

 The present invention is provided with a heat pump. As this heat pump, a conventionally known one constituted by an evaporator, a compressor, a condenser, an expander, and a pipe line connecting them can be used. .

 In this embodiment, an example is shown in which the jacket portion 2 of the reaction kettle 1 is used as a heat exchanger. An object to be heated (not shown) put inside the reaction kettle 1 is heated by heating steam as a heating source supplied to the jacket portion 2.

 A jacket portion 2 is formed over substantially the entire circumference of the reaction kettle 1, and a combined vacuum pump 4 as a suction means and a heating steam supply pipe 8 as a heating fluid are connected to the jacket portion 2.

  A heating steam supply pipe 8 with a flow rate adjusting valve 7 interposed is connected to the upper left portion of the jacket portion 2. The heating steam in the reaction kettle 1 can be heated by supplying heating steam having a predetermined pressure, that is, temperature from the heating steam supply pipe 8 to the jacket portion 2.

  A discharge pipe 20 is connected below the jacket portion 2 and connected to the ejector 10 of the combination vacuum pump 4. A steam trap 22 is attached to the discharge pipe 20, and a bypass valve 23 is attached in parallel with the steam trap 22.

  The combination vacuum pump 4 is formed by an ejector 10, a circulation pump 14, a circulation water tank 13, and an evaporation pipe 21 of the heat pump 3 disposed in the circulation water tank 13. An electric heater 24 capable of heating the circulating water in the tank 13 to a desired temperature is attached to the bottom of the circulating water tank 13. The combination vacuum pump 4 discharges the circulating water in the circulating water tank 13 from the circulating pump 14 to the ejector 10 and circulates it again to the circulating water tank 13, and the circulating water is discharged to the ejector 10 at a high speed. As a result, a suction force is generated in the ejector 10, the condensate in which the steam is condensed in the jacket portion 2 is sucked from the discharge pipe 20 below the jacket portion 2, mixed with the circulating water, and flows down to the circulating water tank 13. Is.

The heat pump 3 includes a compressor 5, a condenser 6, a steam trap 9 as an expander, and an evaporator 13 in which a circulating water tank 13 exerts its action, and a circulation path 11 that communicates each device. Communicate with

 A circulating water supply pipe 12 for branching the discharge side of the circulation pump 14 and supplying a part of the circulating water to the condenser 6 is connected. The circulating water supply pipe 12 is heated by exchanging heat with the circulation path 11 of the heat pump 3 in the condenser 6 via a water level control valve 15 that controls the water level in the condenser 6. And the steam is supplied from the heating steam supply pipe 8 to the jacket portion 2. An object to be heated in the reaction kettle 1 is heated by the steam supplied to the jacket portion 2.

The heat medium in the circulation path 11 deprived of heat by exchanging heat with the circulating water in the steam supply pipe 16 by the condenser 6 is condensed to become a liquid and expands while passing through the steam trap 9 as an expander. The gas then flows down to the evaporator 13. The heat medium that has been heated by removing heat from the circulating water in the evaporator 13 in the evaporator 13 is compressed by the compressor 5, further heated, and sent to the condenser 6.

  The evaporator 13, that is, the circulating water in the circulating water tank 13 is cooled by removing heat from the evaporation pipe 21. In this way, the circulating water is cooled, so that it is not necessary to supply new cooling water, and the amount of cooling water used in the combination vacuum pump 4 can be reduced.

 The temperature of the circulating water supplied from the circulating water supply pipe 12 to the condenser 6 can be arbitrarily controlled by attaching an electric heater 24 capable of heating the circulating water to a desired temperature in the circulating water tank 13. In combination with the control of the heat pump 3, the temperature of the steam supplied from the heating steam supply pipe 8 to the jacket part 2 can be arbitrarily controlled, and a steam generation source such as a steam boiler must be separately installed. Disappears.

INDUSTRIAL APPLICABILITY The present invention can be used as a low pressure steam heating apparatus that heats a heat exchange object with low pressure steam in a heat exchange chamber without separately installing a steam generation source such as a steam boiler.

DESCRIPTION OF SYMBOLS 1 Reaction kettle 2 Jacket part 3 Heat pump 4 Combination vacuum pump 5 Compressor 6 Condenser 8 Steam supply pipe for heating 9 Steam trap 10 Ejector 11 Circulation path 12 Circulating water supply pipe 13 Evaporator 16 Steam supply pipe 20 Exhaust pipe 21 Evaporation pipe 22 Steam trap

Claims (1)

Steam is supplied to the heating section of the heat exchanger with a heat exchanger that contains the object to be heated, a heat pump that is filled with a heat medium in a closed loop by an evaporator, compressor, condenser, and expander. The steam supply pipe is heated by exchanging heat with the heat medium, and a suction means for sucking the fluid in the heating section is connected to the heating section of the heat exchanger, and the inside of the heating section is about atmospheric pressure or lower than the atmospheric pressure by the suction means. The low-pressure steam heating apparatus is characterized in that the circulating liquid circulating through the suction means is cooled by exchanging heat with the heat medium in the evaporator of the heat pump.

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