JP2018047418A - Steam heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a heating capacity of a steam heating device. SOLUTION: A steam heating device 100 is separated from a kettle main body 11 for accommodating an object O and a kettle main body 11 and exchanges heat with the object O in the kettle main body 11 from an atmospheric pressure. The first supply pipe 21 and the first control valve 31 that supply the first steam with a low pressure to the jacket portion 12, and the second supply pipe 22 that supplies the second steam with a pressure lower than the atmospheric pressure into the kettle body 11. A second control valve 32 and a vacuum generator 40 for sucking steam in the kettle body 11 are provided. The steam heating device 100 heats the object O by the first steam through the jacket portion 12, and also heats the object O by the second steam. [Selection diagram] Fig. 1

Description

  The technique disclosed here relates to a steam heating apparatus.

  Conventionally, a steam heating apparatus that heats an object with steam is known. For example, a steam heating device disclosed in Patent Document 1 includes a housing part (reaction kettle) that houses an object, and a heat exchange part (jacket part) that is partitioned from the housing part and performs heat exchange with the object in the housing part. The object is heated by the steam supplied to the heat exchange unit.

Japanese Patent Publication No. 5-34054

  By the way, when improving a heating capability in the above-mentioned steam heating apparatus, it is possible to enlarge the heat transfer area of an accommodating part and a heat exchange part, or to raise the temperature of steam. However, it may not be possible to achieve the desired heating capacity with only such changes and adjustments.

  The technology disclosed herein has been made in view of such a point, and an object thereof is to improve the heating capability of the steam heating apparatus.

  The technology disclosed herein includes a storage unit that stores an object, a heat exchange unit that is partitioned from the storage unit and performs heat exchange with the target in the storage unit, and a first steam having a pressure lower than atmospheric pressure. A first supply part for supplying the heat exchange part, a second supply part for supplying a second steam having a pressure lower than the atmospheric pressure into the storage part, and a suction part for sucking the steam in the storage part. The object is heated by the first steam through the heat exchange unit, and the object is heated by the second steam.

  According to the steam heating apparatus, the heating capacity can be improved.

FIG. 1 is a piping system diagram showing a schematic configuration of a steam heating apparatus.

  Hereinafter, embodiments of the present application will be described with reference to the drawings. Note that the following embodiments are essentially preferable examples, and are not intended to limit the scope of the technology disclosed in the present application, applications thereof, or uses thereof.

  FIG. 1 is a piping system diagram illustrating a schematic configuration of the steam heating apparatus 100. The steam heating device 100 includes a reaction kettle 10 for heating the object O with steam, and a fluid circuit 20 that supplies the steam to the reaction kettle 10 and collects steam and drain from the reaction kettle 10. The object O accommodated in is heated with saturated steam below atmospheric pressure.

  The reaction kettle 10 includes a kettle main body 11 in which the object O is accommodated, and a jacket portion 12 formed over substantially the entire circumference of the kettle main body 11. The pot body 11 accommodates a substance having a boiling point higher than that of water as the object O. An example of the object O is oil. The jacket portion 12 is partitioned from the hook body 11 and performs heat exchange with the object O in the hook body 11. The hook body 11 is an example of a housing part, and the jacket part 12 is an example of a heat exchange part.

  The fluid circuit 20 includes a first supply pipe 21 that supplies the first steam to the jacket part 12, a second supply pipe 22 that supplies the second steam to the pot body 11, and a first discharge that discharges the drain from the jacket part 12. A pipe 23, a second discharge pipe 24 for discharging steam from the hook body 11, a first control valve 31 provided in the first supply pipe 21, and a second control valve 32 provided in the second supply pipe 22 Drain and steam are sucked through the steam trap 33 provided in the first discharge pipe 23, the check valve 34 provided in the second discharge pipe 24, and the first discharge pipe 23 and the second discharge pipe 24. And a vacuum generator 40.

  The first supply pipe 21 and the second supply pipe 22 are branched from a supply pipe 29 connected to a steam generator (not shown). The first supply pipe 21 is connected to the jacket portion 12. The second supply pipe 22 extends to the vicinity of the bottom of the hook body 11 and supplies the second steam into the hook body 11 from the vicinity of the bottom of the hook body 11.

  The first control valve 31 adjusts the pressure of the first steam flowing through the first supply pipe 21. The first supply pipe 21 is provided with a pressure sensor (not shown) that detects the pressure of the first steam. The first control valve 31 adjusts the pressure of the first steam to a first pressure lower than atmospheric pressure based on the detection value of the pressure sensor. The first control valve 31 may adjust the temperature of the first steam. In this case, the first supply pipe 21 is provided with a temperature sensor that detects the temperature of the first steam. The first supply pipe 21 and the first control valve 31 are an example of a first supply unit.

  The second control valve 32 adjusts the pressure of the second steam flowing through the second supply pipe 22. The second supply pipe 22 is provided with a pressure sensor (not shown) that detects the pressure of the second steam. The second control valve 32 adjusts the pressure of the second steam to a second pressure lower than the atmospheric pressure and lower than the first steam based on the detection value of the pressure sensor. Note that the second control valve 32 may adjust the temperature of the second steam. In this case, the second supply pipe 22 is provided with a temperature sensor that detects the temperature of the second steam. The second supply pipe 22 and the second control valve 32 are an example of a second supply unit.

  The upstream end of the first discharge pipe 23 is connected to the lower part of the jacket portion 12, and the downstream end of the first discharge pipe 23 is connected to the vacuum generator 40. Drain from the jacket portion 12 flows into the steam trap 33. The steam wrap 33 is closed when the drain is not flowing, and is opened when the drain flows, and only the drain is discharged toward the vacuum generator 40.

  The upstream end of the second discharge pipe 24 is connected to the upper portion of the hook body 11, and the downstream end of the second discharge pipe 24 is connected to a portion of the first discharge pipe 23 downstream of the steam trap 33. The check valve 34 allows only the flow from the upstream to the downstream in the second discharge pipe 24, that is, the flow from the hook body 11 to the vacuum generator 40, and prevents the reverse flow.

  The vacuum generator 40 includes a drain tank 41 that stores drain, a pump 42 that pumps the drain in the drain tank 41, and an ejector 43 that generates a suction force by the drain from the pump 42. The drain tank 41, the pump 42 and the ejector 43 are connected by a pipe 44, and a circulation channel including the drain tank 41, the pump 42 and the ejector 43 is formed. The downstream end of the first discharge pipe 23 is connected to the suction port of the ejector 43. The vacuum generator 40 is an example of a suction unit.

  The vacuum generator 40 circulates the drain stored in the drain tank 41 through the pump 42 and the ejector 43 to generate a suction force in the ejector 43, and passes through the first discharge pipe 23 and the second discharge pipe 24. Then, drain and steam are sucked from the reaction kettle 20. Further, the vacuum generator 40 sucks and depressurizes the interior of the hook body 11 and the jacket portion 12 to maintain a predetermined vacuum state (pressure state lower than atmospheric pressure). The vacuum generator 40 maintains the hook body 11 and the jacket portion 12 at a pressure lower than the first pressure and the second pressure (more specifically, a pressure lower than the saturated vapor pressure of the first steam and the second steam). More specifically, in the vacuum generator 40, the temperature corresponding to the saturated vapor pressure of the pot body 11, that is, the saturation temperature is lower than the saturation temperature of the second vapor (preferably, a temperature lower by 10 degrees or more). In this manner, the main body 11 is decompressed.

  Operation | movement of the steam heating apparatus 1 comprised in this way is demonstrated.

  When the vacuum generator 40 is driven, the hook body 11 and the jacket portion 12 are depressurized and are in a vacuum state.

  Then, the first steam adjusted to the first pressure by the first control valve 31 is supplied to the jacket portion 12, and the second steam adjusted to the second pressure by the second control valve 32 is supplied to the hook body 11. . The first steam indirectly exchanges heat with the object O in the main body 11 through the jacket portion 12 to heat the object O. The first steam is condensed by exchanging heat with the object O. The generated drain is sucked into the vacuum generator 40 through the first discharge pipe 23.

  On the other hand, since the second steam is supplied to the vicinity of the bottom of the hook body 11, it is directly supplied into the object O in the hook body 11. The second steam directly exchanges heat with the object O and heats the object O. The second steam is condensed and becomes drain D. The drain D has a specific gravity greater than that of the object (oil) O, and therefore accumulates at the bottom of the hook body 11. The drain D in the hook body 11 is heated to the first steam through the jacket portion 12 and re-evaporates. At this time, although the object O and the drain D exist in the pot main body 11, since the object (oil) O has a boiling point higher than that of the drain (water) D, the drain D is selectively re-evaporated. . The re-evaporated steam heats the object O and becomes drain D again or stays in the upper space of the main body 11. The re-evaporated vapor staying in the upper space of the pot body 11 is sucked into the vacuum generator 40 through the second discharge pipe 24.

  In addition, since the pressure in the hook body 11 is maintained at a pressure lower than the pressure of the second steam, the re-evaporation of the drain D generated from the second steam is further promoted. Specifically, the temperature of the drain D generated from the second steam is substantially equal to the saturation temperature of the second steam. On the other hand, the pressure in the hook body 11 is lower than the saturated vapor pressure of the second steam. That is, the temperature in the hook body 11 is lower than the saturation temperature of the second steam, and hence the temperature of the drain D. Therefore, the inside of the hook body 11 is in an environment in which the drain D is easily re-evaporated, and the re-evaporation of the drain D is promoted. Furthermore, the re-evaporation of the drain D is further promoted by setting the temperature of the hook body 11 to a temperature lower by 10 degrees or more than the saturation temperature of the second steam.

  Thus, the steam heating apparatus 100 not only indirectly heats the object O in the reaction kettle 20 with the first steam, but also directly heats the object O with the second steam. Thereby, compared with the structure which heats the target object O only indirectly with 1st vapor | steam, the heating rate of the target object O, ie, a heating capability, can be improved.

  As described above, the steam heating apparatus 100 includes the hook body 11 (housing portion) that houses the object O, and the jacket portion 12 (that is partitioned from the hook body 11 and performs heat exchange with the object O in the pot body 11. Heat exchange section), a first supply pipe 21 and a first control valve 31 (first supply section) for supplying the first steam having a pressure lower than the atmospheric pressure to the jacket section 12, and a first pressure having a pressure lower than the atmospheric pressure. 2 provided with a second supply pipe 22 and a second control valve 32 (second supply part) for supplying steam into the pot body 11, and a vacuum generator 40 (suction part) for sucking the steam in the pot body 11, The object O is heated by the first steam through the jacket portion 12, and the object O is heated by the second steam.

  According to this configuration, the object O in the hook body 11 is indirectly heated by the first steam through the jacket portion 12 and is directly heated by the second steam in the hook body 11. Thereby, the heating rate of the steam heating apparatus 100, that is, the heating capacity is improved. At this time, the second steam that heats the object O in the pot body 11 becomes the drain D, but is heated by the first steam through the jacket portion 12 and re-evaporates. The vapor re-evaporated in the pot body 11 is sucked by the vacuum generator 40 and discharged from the pot body 11.

  The first supply pipe 21 and the first control valve 31 supply the first steam having a temperature higher than that of the second steam.

  According to this configuration, the temperature of the first steam is higher than the drain D generated in the hook body 11. Therefore, the re-evaporation of the drain D by the first steam through the jacket part 12 can be promoted.

  Further, the vacuum generator 40 sucks so that the pressure in the hook body 11 is lower than the pressure of the second steam.

  According to this configuration, it is possible to create an environment in which the drain D is easily re-evaporated in the hook body 11, and it is possible to promote the re-evaporation of the drain D.

  Furthermore, the vacuum generator 40 sucks the drain of the jacket portion 12 in addition to the hook body 11.

  According to this configuration, both the drain of the jacket portion 12 and the steam of the hook body 11 can be sucked by one vacuum generator 40.

<< Other Embodiments >>
As described above, the embodiment has been described as an example of the technique disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to an embodiment in which changes, replacements, additions, omissions, and the like are appropriately performed. Moreover, it is also possible to combine each component demonstrated by the said embodiment and it can also be set as a new embodiment. In addition, among the components described in the attached drawings and detailed description, not only the components essential for solving the problem, but also the components not essential for solving the problem in order to illustrate the technology. May also be included. Therefore, it should not be immediately recognized that these non-essential components are essential as those non-essential components are described in the accompanying drawings and detailed description.

  About the said embodiment, it is good also as following structures.

  The object O heated by the steam heating apparatus 100 is not limited to oil. A substance having a boiling point higher than that of water can be the object O.

  The first supply pipe 21 as the first supply section and the second supply pipe 22 as the second supply section are branched from the supply pipe 29, but are not limited thereto. For example, the first supply pipe 21 and the second supply pipe 22 are separate systems, and steam may be supplied from different steam supply sources.

  Further, the temperature of the first steam is set higher than the temperature of the second steam, but is not limited to this. Since the inside of the pot body 11 is depressurized by the vacuum generator 40 and has a pressure lower than the second pressure, the drain D generated from the second steam is re-evaporated without reheating by the first steam. obtain. That is, the temperature of the first steam may be the same as the temperature of the second steam, or may be lower than the temperature of the second steam. However, from the viewpoint of promoting the re-evaporation of the drain D generated from the second steam, it is preferable that the temperature of the first steam is higher than the temperature of the second steam.

  The first discharge pipe 23 and the second discharge pipe 34 merge to form one discharge pipe. However, the first discharge pipe 23 and the second discharge pipe 34 may be separate systems.

  The reaction kettle 10 is composed of a kettle main body 11 as a housing part and a jacket part 12 as a heat exchange part, but is not limited thereto. The heat exchanging part is partitioned from the accommodating part, and any structure can be adopted as long as the heat exchanging part indirectly exchanges heat with the object in the accommodating part. For example, the heat exchange unit may be a tube-type heat exchanger disposed in the housing unit.

  The vacuum generator 40 is not a configuration using the ejector 43 but may be an electric vacuum pump or the like.

  The technique disclosed herein is useful for steam heating devices.

100 Steam heating device 11 Pot body (housing part)
12 Jacket part (heat exchange part)
21 1st supply pipe (1st supply part)
22 2nd supply pipe (2nd supply part)
31 1st control valve (1st supply part)
32 2nd control valve (2nd supply part)
40 Vacuum generator (suction part)

Claims (4)

A storage section for storing the object;
A heat exchange section that is partitioned from the housing section and performs heat exchange with an object in the housing section;
A first supply unit that supplies first steam having a pressure lower than atmospheric pressure to the heat exchange unit;
A second supply unit that supplies second steam having a pressure lower than atmospheric pressure into the housing unit;
A suction part for sucking vapor in the housing part,
A steam heating apparatus that heats an object with the first steam and heats the object with the second steam through the heat exchange unit. The steam heating apparatus according to claim 1,
The first heating unit supplies the first steam having a temperature higher than that of the second steam. In the steam heating apparatus according to claim 1 or 2,
The steam heating device according to claim 1, wherein the suction unit performs suction so that a pressure in the housing unit is lower than a pressure of the second steam. In the steam heating device according to any one of claims 1 to 3,
The said suction part attracts | sucks the drain of the said heat exchange part in addition to the said accommodating part, The steam heating apparatus characterized by the above-mentioned.

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