JP2017187270A - Steam supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steam supply device capable of reliably supplying stable steam.SOLUTION: A steam supply device includes a water storage tank 1 for storing water, a main heat exchanger 2, and a steam discharge portion 6 having a steam discharge port 61. The water supplied to the main heat exchanger 2 from the water storage tank 1, is allowed to exchange heat with a heat medium from a boiler in the main heat exchanger 2 to be vaporized, and then the steam is sent to the steam discharge portion 6 to be discharged from the steam discharge port 61. Auxiliary heaters 4 and 5 are disposed between the main heat exchanger 2 and the steam discharge portion 6. The steam vaporized by the main heat exchanger 2 is heated by the auxiliary heaters 4 and 5 and sent to the steam discharge portion 6.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a steam supply device for supplying steam when steaming or cooking foods.

  Conventionally, steam is used when steamed foods are prepared by steaming seafood such as crabs. As an apparatus for generating such steam for steaming, a steam supply apparatus as shown in the following Patent Document 1 is well known.

  This steam supply device generates steam by evaporating water supplied from a water storage tank into a heat exchanger by exchanging heat with high-pressure steam as a heat medium supplied from a boiler to the heat exchanger. Further, the generated steam is discharged from a steam discharge port and supplied to a steaming cooker or heating cooker called a manufacturing apparatus via a steam delivery pipe.

Japanese Patent No. 3352968

  However, in the conventional steam supply device, when the steam discharged from the steam discharge port of the steam supply device is supplied to the manufacturing device via the steam delivery pipe, for example, a part of the steam condenses in the steam delivery pipe. Then, the humidity and temperature of the steam fluctuate and the state of the steam becomes unstable, and there is a problem that it is difficult to reliably supply a stable steam in an appropriate state to a manufacturing apparatus or the like. .

  This invention is made | formed in view of said subject, and it aims at providing the vapor | steam supply apparatus which can supply the stable vapor | steam of an appropriate state reliably.

  In order to solve the above problems, the present invention comprises the following means.

[1] A water storage tank for storing water, a main heat exchanger, and a steam discharge portion having a steam discharge port, and water supplied from the water storage tank to the main heat exchanger is supplied to the main heat exchanger. A steam supply device configured to exchange heat with a heat medium from a boiler to vaporize, and to send the steam to the steam discharge unit and discharge from the steam discharge port,
An auxiliary heater is provided between the main heat exchanger and the steam discharge part,
A steam supply device configured to heat the steam vaporized by the main heat exchanger by the auxiliary heater and send the steam to the steam discharge section.

[2] The auxiliary heater includes a first auxiliary heater and a second auxiliary heater,
The steam vaporized by the main heat exchanger is heated by the first auxiliary heater, and the heated steam is heated by the second auxiliary heater at a temperature higher than that of the first auxiliary heater. 2. The steam supply device according to item 1, wherein the steam supply device is made to discharge from a discharge port.

[3] The first auxiliary heater is constituted by an auxiliary heat exchanger configured to heat the steam generated in the main heat exchanger by heat exchange with a heat medium supplied from a boiler,
3. The steam supply device according to item 2, wherein the second auxiliary heater is configured by a power heater that heats the steam with an electric heater.

[4] The steam is heated at a temperature of 104 ° C to 120 ° C by the first auxiliary heater,
4. The steam supply device according to 2 or 3 above, wherein the steam is heated by the second auxiliary heater at a temperature not lower than the heating temperature of the first auxiliary heater and not higher than 300 ° C.

  [5] The steam supply apparatus according to any one of the preceding items 1 to 4, wherein a gas-liquid separator for removing moisture in the steam is provided between the main heat exchanger and the auxiliary heater. .

  According to the steam supply device of the invention [1], the steam discharged from the steam discharge port of the steam discharge section is vaporized by the main heat exchanger and then heated again by the auxiliary heater to be set to a high temperature. Therefore, for example, it is possible to effectively prevent a problem that a part of the steam condenses or the steam temperature becomes lower than a desired temperature before the discharged steam is introduced into the manufacturing apparatus. In addition, it is possible to reliably and continuously supply steam having a high temperature and appropriate humidity to the manufacturing apparatus in a stable state.

  According to the steam supply device of the invention [2], since the steam generated by the main heat exchanger is gradually heated in two stages by the first and second auxiliary heaters, it is heated to a high temperature at a time. Compared to the case, it is possible to prevent the occurrence of temperature unevenness and the like, and to supply steam in a more stable state.

  According to the steam supply device of the invention [3], the first auxiliary heater is constituted by an auxiliary heat exchanger that can use the same heat source (high-pressure steam) as the main heat exchanger, and therefore a heat source is separately prepared. It is not necessary and can be efficiently heated accordingly, and the steam supply device itself can be prevented from becoming large, and the device can be made compact and compact. Furthermore, since the electric heater heated by an electric heater is used as the second auxiliary heater, the temperature of the steam discharged from the steam discharge port of the steam discharge section can be reliably increased to a desired high temperature. .

  According to the steam supply device of the invention [4], the above effect can be obtained more reliably.

  According to the steam supply apparatus of the invention [5], the above effect can be obtained more reliably.

FIG. 1 is a block diagram showing a steam supply apparatus according to an embodiment of the present invention.

  FIG. 1 is a block diagram showing a steam supply apparatus according to an embodiment of the present invention. As shown in the figure, this steam supply device heats water to generate steam. From the upstream side to the downstream side, the water storage tank 1, the main heat exchanger 2 as a heat exchanger, the air A liquid separator (gas / water separator) 3, an auxiliary heat exchanger 3 as a first auxiliary heater, a power heater 4 as a second auxiliary heater, and a steam discharge header 5 are sequentially arranged.

  In the present embodiment, an auxiliary heater is configured by the first auxiliary heater and the second auxiliary heater. Further, the steam discharge header 5 constitutes a steam discharge portion.

  Although the main heat exchanger 2 may be simply referred to as a heat exchanger, in this embodiment, the main heat exchanger 2 is referred to as a main heat exchanger in a sense that distinguishes it from the auxiliary heat exchanger 3.

  The water storage tank 1 is configured to store predetermined water, and is a sealed tank whose inside is sealed against the outside air. The water storage tank 1 is connected to water supply means such as a water supply pipe through a water supply pipe 11, and an electric opening degree adjusting valve 12 is provided in the water supply pipe 11. By adjusting the opening degree of the opening degree adjusting valve 12, the amount of water supplied from the water supply means to the water storage tank 1 is freely adjusted. Although not shown, the water supply pipe 11 is provided with an automatic water softening device. Water supplied from the water supply means is softened through the automatic water softening device, and the soft water is supplied to the water storage tank 1. It has become so.

  A water level adjustment tank 13 is provided side by side on the side of the water storage tank 1. Similar to the water storage tank 1, the water level adjustment tank 13 is a sealed tank whose inside is sealed against the outside air. The water level adjustment tank 13 and the water storage tank 1 are communicated via two upper and lower communication pipes 14 so that water and air can freely pass between the tanks 1 and 13. It is comprised so that the water level between 1 and 13 may become equal.

  A water level sensor 15 is installed in the water level adjustment tank 13, and the water level of the water level adjustment tank 13 can be detected based on information from the water level sensor 15, and the water level of the water storage tank 1 can be detected indirectly.

  In the present embodiment, the water level in the water storage tank 1 is constantly monitored based on information from the water level sensor 15 during operation of the steam supply device, and the actual water level obtained from the water level sensor 15 is set in advance. The opening degree of the opening degree adjusting valve 12 is adjusted so as to be constantly maintained at a predetermined water level (set water level).

  The diameter of the communication pipe 14 connecting the tanks 1 and 13 is larger than that of the water supply pipe 11 for supplying clean water. Things are used. As a result, it is possible to smoothly move water between the tanks 1 and 13, and when the water is supplied from the water supply pipe 11 into the water storage tank 1, the water level between the tanks 1 and 13 is instantaneously changed. It is comprised so that it may become equal. Therefore, the water level in the water storage tank 1 can be adjusted with high accuracy through the water level adjusting tank 13.

  A water inlet 21 is provided at the lower end of the main heat exchanger 2, and a steam outlet 22 is provided at the upper end. The water inlet 21 of the main heat exchanger 2 and the lower end of the water storage tank 13 are connected in communication by a first water supply pipe 71, and the water in the water storage tank 13 passes through the first water supply pipe 71 and enters the main heat exchanger 2. To be supplied. A check valve 17 is disposed in the first water supply pipe 71 and is configured to prevent water in the main heat exchanger 2 from flowing back to the water storage tank 13 through the first water supply pipe 71. .

  Further, the upstream side of the check valve 17 in the first water supply pipe 71 and the upper part of the water level adjustment tank 13 are connected via a circulation pipe 14 a having a pipe diameter similar to that of the connection pipe 14. As a result, when necessary, the water in the first water supply pipe 71 is returned to the water level adjustment tank 13, and the water level between the water storage tank 1 and the water level adjustment tank 13 can be adjusted more smoothly, and the water level in the water storage tank 1 can be further increased. Adjustment can be performed with high accuracy.

  One end (upstream end) of the second water pipe 72 is connected to the upstream end of the first water pipe 71, and the second water pipe is connected to the downstream end of the first water pipe 71. The other end part (downstream end part) of 72 is connected.

  The second water supply pipe 72 is provided with a water supply pump 16 for pumping water from the water storage tank 1 side to the main heat exchanger 2 side, and open / close valves 19 and 19 are provided on both sides of the water supply pump 16. . Therefore, when the water supply pump 16 is driven with the on-off valves 19 and 19 open, the water in the water storage tank 1 is forcibly sent to the main heat exchanger 2 side through the second water supply pipe 72. Yes.

  The second water pipe 72 is provided with a check valve 18 so that the water in the main heat exchanger 2 can be prevented from flowing back to the water storage tank 13 through the second water pipe 72. ing.

  A large number of heat transfer tubes 20 are arranged in parallel from the lower end to the upper end inside the main heat exchanger 2, and water flowing from the water inlets 21 is vaporized through the heat transfer tubes 20 as described later. It flows out from the steam outlet 22.

  The heat transfer tube 20 of the main heat exchanger 2 is open to the atmosphere so that the internal pressure becomes equal to the atmospheric pressure. As described above, since the water level in the storage tank 1 is configured to be kept constant, the water level in the main heat exchanger 2 (heat transfer pipe 20) is also kept constant.

  A heat medium inlet 23 is provided on the upper side of the main heat exchanger 2, and a heat medium outlet 24 is provided on the lower side. A heat medium inlet pipe 25 is connected to the heat medium inlet 23, and a heat medium outlet pipe 26 is connected to the heat medium outlet 24.

  The heat medium introduction pipe 25 is connected to a boiler, and high-pressure steam (heat medium steam) discharged from the boiler is passed through the heat medium introduction pipe 25 from the heat medium inlet 23 into the main heat exchanger 2. To be introduced. The heat medium steam introduced into the main heat exchanger 2 passes through spaces between the heat transfer tubes 20, and heat exchange is performed with water in the heat transfer tubes 20. After the water in the heat transfer tube 20 is heated and vaporized by this heat exchange, the steam (supply steam) flows out from the steam outlet 22 of the main heat exchanger 2 as described above. .

  The steam for the heat medium introduced into the main heat exchanger 2 is condensed and liquefied by heat exchange with water, and then flows out from the heat medium outlet 24 and is discharged to a predetermined discharge location through the heat medium outlet pipe 26. It is like that.

  The heating medium introduction pipe 25 is provided with an electric opening degree adjusting valve 27. By adjusting the opening degree of the opening degree adjusting valve 27, the main heat exchanger 2 for the heat medium (high pressure steam). The heating temperature by the main heat exchanger 2 and the like can be freely controlled by adjusting the introduction amount to the main heat exchanger.

  The steam outlet 22 of the main heat exchanger 2 is connected to the inlet of the gas-liquid separator (gas-water separator) 2. In the gas-liquid separator 3, a number of baffle plates 31 perpendicular to the flow direction of the steam are arranged in the flow direction, and when the supply steam passes between the baffle plates 31, After the excess water adheres to the surface of the baffle plate 31 and is removed, the supply steam flows out from the gas-liquid separator 3.

  An auxiliary heat exchanger 4 as a first auxiliary heater is disposed on the downstream side (steam outlet side) of the gas-liquid separator 3, and the supply steam flowing out of the gas-liquid separator 3 is supplied to the auxiliary heat exchanger. 4 is introduced.

  The auxiliary heat exchanger 4 is provided with a heat medium passage (heat medium pipe passage) 41 therein. The downstream end of the branch pipe 42 is connected to the upstream end (heat medium inlet) of the heat medium passage 41, and the upstream end of the branch pipe 42 is connected to the heat medium introduction pipe 25. The heat medium introduction pipe 5 is connected so as to branch off. The branch pipe 42 is provided with an open / close valve 44. Further, a drain pipe 43 is connected to the downstream side end (heat medium outlet) of the heat medium passage 41. When the on-off valve 44 of the branch pipe 42 is opened, the high-pressure steam (heat medium steam) introduced from the boiler into the heat medium introduction pipe 25 passes through the branch pipe 42 and the heat medium flow path of the auxiliary heat exchanger 4. 41. While the heat medium steam introduced into the heat medium flow path 41 passes through the heat medium flow path 41, the heat medium steam exchanges heat with the supply steam introduced into the auxiliary heat exchanger 4 from the gas-liquid separator 3, The supply steam will be heated.

  On the downstream side (steam outlet side) of the auxiliary heat exchanger 4, a power heater 5 as a second auxiliary heater is disposed, and the supply steam flowing out from the auxiliary heat exchanger 4 is the power heater. 5 is introduced.

  An electric heater 51 is provided in the electric power heater 5. The electric heater 51 can adjust the amount of heat generated by the electric heater 51 via a heater operation unit (not shown) such as SSR. The supply steam introduced from the auxiliary heat exchanger 4 to the electric power heater 5 is further heated by the electric heater 51.

  A steam discharge header 6 as a steam discharge portion is disposed downstream of the electric power heater 5 (steam outlet side), and supply steam flowing out of the electric power heater 5 is introduced into the vapor discharge header 6. It has come to be.

  The steam discharge header 6 is provided with a plurality of steam discharge ports 61, and each steam discharge port 61 is connected to a manufacturing apparatus such as a steaming cooker or a heating cooker via a steam delivery pipe (not shown). Yes. As a result, the supply steam introduced from the electric heater 5 into the steam discharge header 6 is uniformly dispersed in the header 6, and then flows out from each steam discharge port 61 and is manufactured via each steam delivery pipe. It is supplied to the device.

  A temperature sensor 62 for detecting the temperature of the supply steam in the header 6 is attached to the steam discharge header 6.

  Furthermore, one end (upstream end) of the hot water supply pipe 63 is connected to the steam discharge header 6, and an open / close valve 64 is provided on one end side (upstream side) and the other end side (downstream side) of the hot water supply pipe 63. 65 is provided.

  One end (upstream end) of the return pipe 66 is connected between the on-off valves 64 and 65 in the hot water supply pipe 63, and the other end (downstream end) of the return pipe 66 is connected to the water storage tank 1. It is connected to. Further, the return pipe 66 is provided with an on-off valve 77.

  In the state where the on-off valves 64 and 65 are opened and the on-off valve 67 is closed, hot water filled in the steam discharge header 6 is connected to the other end side of the hot water supply pipe 63 via the hot water supply pipe 63 as necessary (described later). It can be taken out from the downstream end). Further, when the on-off valves 64 and 67 are opened and the on-off valve 65 is closed, the hot water filled in the steam discharge header 6 can be returned to the water storage tank 1 through the hot water supply pipe 63 and the return pipe 66 as will be described later. It is like that.

  In the steam supply device of the present embodiment, a control device 8 for controlling the operation is provided. 1, the control device 8 is electrically connected to various sensors such as the water level sensor 15 of the water level adjusting tank 13 and the temperature sensor 62 of the steam discharge header 6 through a signal line and the like. The drive opening control valve 12, the forced circulation water pump 16, the boiler steam supply opening control valve 27, and the electric heater 51 are electrically connected. Then, the control device 8 starts to operate in response to an instruction from the operator, and controls the driving of each driving unit based on a preset program and output information from the various sensors. Each processing operation such as a steam supply process, a hot water supply process, and a circulation process as described in (1) is automatically executed. The control device 8 is constituted by, for example, a microcomputer.

  Next, the operation | movement at the time of the normal steam supply process in the steam supply apparatus of this embodiment is demonstrated. When this steam supply processing is performed, the on-off valves 19 and 19 of the second water supply pipe 72 and the on-off valves 64, 65 and 67 of the hot water supply pipe 63 and the return pipe 66 are closed, and a branch for supplying boiler steam. This is performed with the on-off valve 44 of the pipe 42 opened.

  When the steam supply process is started in this state, the opening degree adjusting valve 12 is opened and water is supplied from the water supply means to the water storage tank 1, and the water is supplied to the water level adjusting tank 13 and the heat transfer pipe 20 of the main heat exchanger 2. The water storage tank 1 stores a predetermined amount of water, and the water level adjustment tank 13 and the heat transfer pipe 20 of the main heat exchanger 2 store water up to a predetermined water level.

  On the other hand, the opening degree adjusting valve 27 is opened, and high pressure steam (heat medium steam) as a heat medium is introduced from the boiler into the main heat exchanger 2 through the heat medium inlet pipe 25 through the heat medium inlet pipe 25. Further, the heat medium steam is introduced into the heat medium passage 41 of the auxiliary heat exchanger 4 through the heat medium introduction pipe 25 and the branch pipe 42 to heat the auxiliary heat exchanger 4 and the electric heater 51 is driven. Thus, the power heater 5 is heated.

  The heating of the auxiliary heat exchanger 4 and the electric power heater 5 may be performed with a time delay. For example, the open / close valve 44 of the branch pipe 42 may be opened or the electric heater 51 may be driven when water vaporization by the main heat exchanger 2 has progressed to some extent.

  The water that has flowed into the heat transfer tube 20 of the main heat exchanger 2 is heated and vaporized by exchanging heat with the heat medium steam introduced into the main heat exchanger 2, whereby steam (supply steam) is obtained. ) Occurs. This supply steam is introduced into the gas-liquid separator 3 through the steam outlet 22.

  The heat medium condensed and liquefied by heat exchange with water flows out from the heat medium outlet 24 and is collected at a predetermined discharge location via the heat medium outlet pipe 26.

  As already described, since the opening degree of the opening degree adjusting valve 12 is adjusted so that the water level of the water storage tank 1 is maintained at a predetermined level, the water evaporated in the main heat exchanger 2 is naturally By replenishing, the water level in the main heat exchanger 2 is always maintained at a predetermined water level.

  The supply steam introduced into the gas-liquid separator 3 passes through the gas-liquid separator 3 to remove excess moisture, and is introduced into the auxiliary heat exchanger 4.

  The supply steam introduced into the auxiliary heat exchanger 4 is heated by the heat medium steam passing through the heat medium passage 41, and the temperature of the steam itself rises.

  On the other hand, the heat medium led out from the auxiliary heat exchanger 4 passes through the drain pipe 43 and is collected at a predetermined discharge location.

  The supply steam heated by the auxiliary heat exchanger 4 is introduced into the electric power heater 5 and further heated by the electric heater 51, and the temperature of the steam itself further increases.

  The high-temperature supply steam sufficiently heated in this way is sent from the electric heater 5 to the steam discharge header 6, where it is evenly dispersed and flows out from each steam discharge port 61 and sent to the manufacturing apparatus.

  In the steam supply device of the present embodiment, the supply steam discharged from the steam discharge header 6 is vaporized by the main heat exchanger 2 and then further divided into two stages by the auxiliary heat exchanger 4 and the electric power heater 5. It is set to a high temperature by reheating. For this reason, for example, the supply steam effectively prevents a problem that a part of the steam condenses between the steam discharge header 6 and the manufacturing apparatus or the steam temperature becomes lower than a desired temperature. It is possible to supply steam of appropriate temperature and humidity continuously and reliably to the manufacturing apparatus in a stable state. Accordingly, steaming, heating, and the like by the manufacturing apparatus can be suitably performed as desired.

  In this embodiment, since the temperature of the supply steam generated by the main heat exchanger 2 is about 104 ° C., the heating temperature of the auxiliary heat exchanger 4 as the first auxiliary heater is set to 104 ° C. or higher. It is good to set. Specifically, it is good to set to 104 to 120 degreeC. Furthermore, it is preferable to set the heating temperature of the electric power heater 5 as the second auxiliary heater to be higher than the heating temperature by the auxiliary heat exchanger 4. Specifically, it is good to set to 110 to 300 ° C. That is, when the heating temperature by the auxiliary heat exchanger 4 or the electric power heater 5 is set in the above-mentioned preferable range, the steam having an appropriate temperature and humidity as already described as the supply steam is surely maintained in a more stable state. Can be provided.

  In the present embodiment, the supply steam generated by the main heat exchanger 2 is gradually heated by the first and second auxiliary heaters 4 and 5 in a stepwise manner, so that it is heated to a high temperature at a time. Compared to the case, it is possible to prevent the occurrence of temperature unevenness and the like, to ensure uniform temperature distribution, and to supply steam in a more stable state.

  In the present embodiment, the first auxiliary heater is constituted by the auxiliary heat exchanger 4, and high-pressure steam similar to that of the main heat exchanger 2 is used as the heat source, so that it is not necessary to prepare a heat source separately. Therefore, it is possible to heat efficiently, and it is possible to prevent the steam supply device itself from becoming large and to reduce the size and size of the device.

  Furthermore, in this embodiment, since the electric heater 5 heated by the electric heater 51 is used as the second auxiliary heater, the temperature of the supply steam can be reliably increased to a desired high temperature. .

  Moreover, in this embodiment, since the sealed type is employ | adopted as the water storage tank 1 (water level adjustment tank 13), it can prevent the influence of air | atmosphere in the water storage tank 1. For this reason, the water level in the water storage tank 1 can be adjusted with higher accuracy, and as a result, the water level fluctuation of the main heat exchanger 2 (heat transfer pipe 20) can be prevented more reliably and more reliably and stably. Steam can be supplied.

  Next, the operation at the time of hot water supply processing in the steam supply device of this embodiment will be described. When performing this hot water supply process, the on-off valves 19 and 19 of the second water supply pipe 72 and the on-off valves 64 and 65 of the hot water supply pipe 63 are opened and the on-off valve 67 of the return pipe 66 is closed. Done. The steam delivery pipe connecting the steam outlet 61 of the steam discharge header 6 and the manufacturing apparatus is provided with a valve such as an on-off valve or an opening degree adjusting valve, and this valve is closed so that steam is supplied to the manufacturing apparatus. It is not supplied. Further, the opening / closing valve 44 of the branch pipe 42 is closed, and heating by the auxiliary heat exchanger 4 is not performed, and driving of the electric heater 51 of the power heater 5 is stopped and heating by the power heater 5 is also performed. There is no state.

  When the hot water supply process is started in this state, the opening degree adjustment valve 12 is opened and water is supplied to and stored in the water storage tank 1 and the water level adjustment tank 13, and the water supply pump 16 is driven to Water is forced into the heat transfer pipe 20 of the main heat exchanger 2 through the second water supply pipe 72.

  On the other hand, the heat medium steam is introduced from the boiler into the main heat exchanger 2 through the heat medium introduction pipe 25. The flow rate of the heat medium steam introduced into the main heat exchanger 2 in the hot water supply process is limited to a small amount by adjusting the opening degree control valve 27. For this reason, the water in the heat transfer tube 20 heated by the heat medium steam does not boil and becomes hot water (supply hot water) at an appropriate temperature.

  The heat medium condensed and liquefied by heat exchange with water flows out from the heat medium outlet 24 and is collected at a predetermined discharge location via the heat medium outlet pipe 26.

  The supply hot water heated by the heat medium flows by the pressure of the water pump 16 to fill the heat transfer pipe 20 of the main heat exchanger 2, and further in the auxiliary heat exchanger 4, the electric power heater 5, and the steam. It is sequentially fed into the discharge header 6 to fill the auxiliary heat exchanger 4, the electric power heater 5 and the steam discharge header 6. The hot water for supply filling the steam discharge header 6 in this way is sent to the hot water supply pipe 63 by the pressure of the water supply pump 16 and flows out from the downstream end of the hot water supply pipe 63. Therefore, the operator can use this hot water for supply (hot water) flowing out. For example, this hot water can be used for cleaning and cleaning the inside of a factory, a steam supply device, a manufacturing device, and equipment around these devices, and can also be used for cleaning the cleaning equipment itself. Can be improved.

  In this hot water supply operation, hot water or the like constitutes each device constituting the steam supply device, that is, a water storage tank 1, a main heat exchanger 2, a gas-liquid separator 3, an auxiliary heat exchanger 4, a power heater 5, and a steam discharge header. Since 6 is sequentially distributed, the inside of these devices can be washed or cleaned.

  Next, the operation | movement at the time of a circulation process in the steam supply apparatus of this embodiment is demonstrated. When this circulation process is performed, the on-off valves 19 and 19 of the second water supply pipe 72, the on-off valve 64 on the upstream side of the hot water supply pipe 63, and the on-off valve 67 of the return pipe 66 are opened, and the hot water supply pipe 63 is opened. The on-off valve 65 at the downstream end is closed. Similar to the hot water supply operation, the valve of the steam delivery pipe connecting the steam discharge header 6 and the manufacturing apparatus is closed. Further, the on-off valve 44 of the branch pipe 42 is closed and the driving of the electric heater 51 is also stopped, so that heating by the auxiliary heat exchanger 4 and the electric power heater 5 is not performed.

  When the circulation process is started in this state, the opening degree adjustment valve 12 is opened and water is supplied to and stored in the water storage tank 1 and the water level adjustment tank 13, and the water pump 16 is driven to supply water in the water storage tank 1. It is sent into the heat transfer pipe 20 of the main heat exchanger 2 through the second water supply pipe 72.

  On the other hand, the heat medium steam is introduced from the boiler into the main heat exchanger 2 through the heat medium introduction pipe 25, and the water in the heat transfer pipe 20 is heated by the heat medium steam in the same manner as the hot water supply process. It becomes hot water of appropriate temperature (hot water for supply).

  The heat medium condensed and liquefied by heat exchange with water flows out from the heat medium outlet 24 and is collected at a predetermined discharge location via the heat medium outlet pipe 26.

  The hot water for supply heated by the heat medium flows by the pressure of the water supply pump 16 to fill the heat transfer pipe 20 of the main heat exchanger 2 as in the hot water supply process. It is sequentially fed into the heater 5 and the steam discharge header 6 to fill the auxiliary heat exchanger 4, the electric power heater 5 and the steam discharge header 6. The hot water for supply filling the inside of the steam discharge header 6 is sent to the hot water supply pipe 63 by the pressure of the water supply pump 16 and returned to the water storage tank 1 through the return pipe 66. The hot water returned to the water storage tank 1 is circulated through the main heat exchanger 2, the gas-liquid separator 3, the auxiliary heat exchanger 4, the electric power heater 5 and the steam discharge header 6 in the same manner as described above. By circulating the hot water in each device of the steam supply device in this way, the inside of these devices can be washed more efficiently and smoothly, and the convenience can be further improved.

  In the circulation process of this embodiment, hot water (hot water) is circulated. However, the present invention is not limited to this, and normal temperature water that is not heated may be circulated. That is, without introducing the steam for the heat medium into the main heat exchanger 2, the water is sent from the water storage tank 1 to the main heat exchanger 2 by the water supply pump 16 and is not heated there, and is kept at room temperature in the same manner as described above. Ordinary water may be circulated through the main heat exchanger 2, the gas-liquid separator 3, the auxiliary heat exchanger 4, the power heater 5, and the steam discharge header 6. Here, in this embodiment, water including normal temperature water to which heat is not applied and hot water (hot water) to which heat is applied is referred to as hot water.

  Moreover, in the circulation process in this embodiment, a chemical | medical agent etc. may be added in the circulating hot water, and the hot water containing the chemical | medical agent may be circulated in each said apparatus of a steam supply apparatus. In that case, in addition to sterilization and sterilization in each device, dirt can be removed more effectively, and the cleaning effect can be further enhanced.

  Moreover, in this embodiment, you may make it carry out circulation of warm water, normal temperature, and the hot water containing a chemical | medical agent sequentially. For example, a circulation process using hot water may be performed first, followed by a circulation process using hot water containing chemicals, and finally a circulation process performed at room temperature.

  Further, in the present embodiment, during the circulation process, by opening the on-off valve 65 of the hot water supply pipe 63, a part of the circulating hot water is taken out from the downstream end of the hot water supply pipe 63, and the hot water You may make it perform a cleaning operation | work etc. using. That is, the hot water circulation process and the hot water supply process may be performed in parallel.

  As described above, in the steam supply device of the present embodiment, by performing the circulation process, hot water can be forced to circulate in each device constituting the device. It can be performed efficiently and smoothly, and convenience can be improved.

  Furthermore, in the steam supply apparatus of the present embodiment, hot water having an appropriate temperature can be obtained without difficulty by performing hot water supply processing, so that the hot water is used to clean the factory, warehouse, and peripheral equipment. It is possible to improve convenience.

  Moreover, in this embodiment, in addition to the 1st water supply pipe | tube 71 which performs a normal steam supply process, the 2nd water supply pipe | tube 72 is separately attached and the hot water supply process and the circulation process are performed using the 2nd water supply pipe | tube 72. Therefore, the steam supply device of the present invention can be easily manufactured simply by attaching the second water supply tube, the water supply pump, etc. to the existing steam supply device having the first water supply tube.

  In the above embodiment, a second water pipe 72 is attached between the water storage tank 1 and the heat exchanger 2 in addition to the first water pipe 71, and the water pump 16 attached to the second water pipe 72 is driven. Thus, hot water is forcibly circulated at the time of hot water supply processing or circulation processing, but the present invention is not limited to this, and the second water supply pipe 72 can be omitted in the present invention. That is, a water supply pump is attached to the first water supply pipe 71 between the water storage tank 1 and the heat exchanger 2 without attaching the second water supply pipe, and the water flows naturally without driving the water supply pump during the steam supply process. The water pump is allowed to pass through the water pump, while the water pump is driven during the hot water supply process or the circulation process, so that the water is forcibly sent out by the pressure of the water pump.

  In the above embodiment, the case where two auxiliary heaters are provided separately from the main heat exchanger 2 has been described as an example. However, in the present invention, the number of auxiliary heaters is limited to two. Is not to be done. For example, in the steam supply apparatus of the present invention, only one auxiliary heater or three or more auxiliary heaters may be provided.

  Moreover, in the said embodiment, although the closed type is employ | adopted as the water storage tank 1 or the water level adjustment tank 13, it is not restricted to it, In this invention, it is substantially air | atmosphere as the waterproof tank 1 or the water level adjustment tank 13. An open type or a semi-sealed type may be adopted. In this case, the water level of the main heat exchanger 2 and the water level of the water storage tank 1 (water level adjustment tank 13) can be matched.

  The steam supply device of the present invention can be suitably used as a device for supplying steam for steaming or heating when steaming, heating, or the like is performed on food or the like by steam.

1: Water storage tank 2: Main heat exchanger 3: Gas-liquid separator 4: Auxiliary heat exchanger (first auxiliary heater)
5: Electric power heater (second auxiliary heater)
51: Electric heater 6: Steam discharge header (steam discharge part)
61: Steam outlet

Claims (5)

A water storage tank for storing water, a main heat exchanger, and a steam discharge section having a steam discharge port, and water supplied from the water storage tank to the main heat exchanger is supplied from the boiler in the main heat exchanger. A steam supply device configured to exchange heat with a heat medium to vaporize, and to send the steam to the steam discharge unit and discharge from the steam discharge port,
An auxiliary heater is provided between the main heat exchanger and the steam discharge part,
A steam supply device configured to heat the steam vaporized by the main heat exchanger by the auxiliary heater and send the steam to the steam discharge section. The auxiliary heater includes a first auxiliary heater and a second auxiliary heater,
The steam vaporized by the main heat exchanger is heated by the first auxiliary heater, and the heated steam is heated by the second auxiliary heater at a temperature higher than that of the first auxiliary heater. The steam supply device according to claim 1, wherein the steam supply device is discharged from a discharge port. The first auxiliary heater is constituted by an auxiliary heat exchanger configured to heat the steam generated in the main heat exchanger by heat exchange with a heat medium supplied from a boiler,
The steam supply device according to claim 2, wherein the second auxiliary heater is configured by a power heater that heats the steam with an electric heater. The steam is heated at a temperature of 104 ° C. to 120 ° C. by the first auxiliary heater,
The steam supply device according to claim 2 or 3, wherein the steam is heated by the second auxiliary heater at a temperature not lower than the heating temperature of the first auxiliary heater and not higher than 300 ° C. The steam supply apparatus according to any one of claims 1 to 4, wherein a gas-liquid separator for removing moisture in the steam is provided between the main heat exchanger and the auxiliary heater.

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