JP3352968B2 - Steam supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam supply device for supplying steam which is suitably used for heating food by steaming or heating food.

[0002]

2. Description of the Related Art Conventionally, steam has been widely used for the steaming processing of steamed foods such as meat buns, sashimi, and Japanese confectionery, the thawing processing of frozen foods, and the thawing heating processing.

[0003] As a device for generating steam for heating such foods, if steam generated from a boiler is directly introduced into a steamer or the like, the steam is a high-temperature, high-pressure superheated steam, and thus the heat treatment is performed. Since the surface of the food afterwards has burns, cracks, etc., and it is difficult to ensure good quality, the steam generated in the boiler is introduced into the heat exchanger, and another water is heated in the heat exchanger. In many cases, steam is generated from the steam, and the steam is used for heating. According to such a method, it is possible to continuously supply low-pressure steam that can be used for heating food.

[0004]

However, the above-mentioned conventional steam supply device has the following problems. First
In addition, there is a problem that a homogeneous steam cannot be obtained. That is, steam having a small moisture content (hereinafter, referred to as “dry steam”), steam having an appropriate moisture content suitable for steaming heating (hereinafter, “wet steam”) is used as the quality of steam.
However, it is important to supply steam in an appropriate state depending on the food to be heated from the viewpoint of ensuring excellent product quality. For example, in the case of steaming foods such as meat buns, shrimps, and Japanese confectionery, it is necessary to supply the above-mentioned wet steam. Cannot be supplied, and there is a problem that the quality of the product is adversely affected, such as uneven steaming. In addition, when performing thawing treatment or thawing heating treatment of frozen food, it is necessary to supply the above-mentioned dry steam. However, the moisture content of the dry steam tends to fluctuate, and a constant uniform dry steam is always supplied. And there is a problem that the quality is similarly deteriorated.

Second, in the conventional steam supply device,
One device can supply either steam or wet steam, and one device can supply steam of any quality as appropriate for the type of food to be heated. I couldn't do that. For example, in the case of school lunch cooking at an elementary school, for example, the food to be heated includes steamed food and frozen food, and it is necessary to appropriately select and supply the type of steam according to these and heat the food. However, this was not possible with a single conventional steam supply device. Of course, it is sufficient to install two units, one for supplying dry steam and the other for supplying wet steam. However, since the installation space is doubled and the equipment cost is doubled,
It has been desired to develop a single steam supply device that can selectively supply dry steam and wet steam.

The present invention has been made in view of such a technical background, and it is possible to selectively supply dry steam and wet steam with a single device, and to supply these steam in a uniform state. It is an object of the present invention to provide a steam supply device capable of continuously supplying the steam.

[0007]

Means for Solving the Problems The inventors of the present invention have found that the main cause of the failure to obtain steam in a uniform state is as follows.
It has been found that the accuracy of water level control in the heat transfer tubes during operation is not sufficient, and based on such findings, as a result of earnest research to achieve the above object, the water storage tank was configured to be open, By maintaining the water level stored in the heat exchanger at a constant level, the water level in the heat exchanger tubes of the heat exchanger can be accurately maintained at a desired constant position. The steam can be supplied stably and continuously, and the heat exchanger and the gas-liquid separator are connected to each other through a flow pipe, and the steam is collected not only in the gas-liquid separator but also in the flow pipe. By adopting a configuration having an outlet, it has been found that dry steam or wet steam in an extremely homogeneous state can be appropriately selected, or both can be simultaneously, stably and continuously supplied, and the present invention has been completed. Things.

[0008] That is, in the steam supply device according to the present invention, an open water storage tank in which the level of water stored in the tank is kept constant, and a plurality of heat transfer tubes are disposed inside. At the same time, a first heat exchanger configured to allow water in the heat transfer tube to exchange heat with high-pressure steam from the boiler, and an extra moisture in generated steam introduced is removed. A gas-liquid separator provided with a first steam outlet, wherein the upper end of the heat transfer tube and the gas-liquid separator are connected to each other by a steam flow pipe, and A second steam outlet is provided, and a lower end of the heat transfer tube and the open water storage tank are connected by a communication pipe so that a water level of the stored water in the open water storage tank and a water level in the heat transfer tube of the first heat exchanger are provided. Is characterized by being matched with

Since the lower end of the heat transfer pipe and the open water storage tank are connected by a communication pipe, when water is consumed due to the generation of steam in the heat transfer pipe, the water is stored in the water storage tank through the communication pipe. Reservoir is replenished. At this time, since the water storage tank is open, if at least one of the two steam outlets is open, the water level of the stored water in the water storage tank and the heat transfer of the first heat exchanger The water level in the pipe is kept in agreement. At this time, since the water level of the stored water in the water storage tank is maintained at a constant height, the water level in the heat transfer tube is always maintained at a desired position. Generally, when directly controlling the water level in a heat transfer tube, it is difficult to control the water level with high precision because the liquid level is in a boiling state, so that a homogeneous steam can be obtained. Although it is difficult, in the present invention, the water level in the heat transfer tube is indirectly controlled by utilizing the above principle, that is, the water level on the water storage tank side where the liquid level does not fluctuate is controlled. Thus, the water level in the heat transfer tube can be controlled with extremely high precision. Therefore, it is possible to stably and continuously supply steam in a very homogeneous state. Further, since the water level on the water storage tank side can be controlled to be constant, it is not necessary to provide a special device group for controlling the water level in the heat transfer tube to be constant. Can be sufficiently reduced.

[0010] Further, the generated steam introduced into the gas-liquid separator is subjected to removal of excess water here, and low-pressure dry steam is obtained from the first steam outlet. On the other hand, the generated steam before being introduced into the gas-liquid separator can be taken out from the second steam outlet provided in the steam feed pipe, so that low-pressure wet steam can be obtained. Therefore, this steam supply device makes it possible to appropriately select dry steam or wet steam in an extremely homogeneous state, or to supply dry steam and wet steam simultaneously, stably and continuously.

It is preferable that the level of the water stored in the open water storage tank is kept constant by a ball tap. Since the ball tap is simple and requires a small equipment space, the size of the entire apparatus can be reduced more sufficiently, and the demand for space saving can be sufficiently satisfied.

It is preferable that the gas-liquid separator is provided with one or more baffle plates inside the gas-liquid separator so as to block the flow of the generated steam to be introduced. The generated steam introduced into the gas-liquid separator comes into contact with a baffle plate that blocks the flow, and the moisture contained in the steam adheres to the baffle plate, thereby removing excess water in the generated steam. , Low pressure dry steam is obtained. As described above, since excess water can be easily removed simply by providing the baffle plate inside the container, it can be simplified and further space saving can be achieved.

Further, a second heat exchanger is disposed in the open water storage tank, and after the steam supplied from the boiler and having undergone heat exchange in the first heat exchanger is liquefied, the second heat exchanger is liquefied. Preferably, it is introduced into the exchanger so that the stored water in the open water storage tank can be preheated. First
The steam from the boiler, which has finished heat exchange in the heat exchanger, is used effectively for preheating the stored water in the open water storage tank, so that energy can be saved and, consequently, extremely low cost. Homogeneous steam can be supplied stably and continuously.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the steam supply device of the present invention will be described below with reference to the drawings. In FIG. 1 showing this steam supply device (1), (2) is an open water storage tank, (3) is a gas-liquid separator, (4) is a first heat exchanger,
(5) is a communication pipe, and (6) is a steam flow pipe.

The open water storage tank (2) is formed of a rectangular column-shaped container having an open upper surface, and the material thereof is not particularly limited, but is preferably made of stainless steel. Note that, in this specification, “open” does not mean only a state in which it can be recognized that it is apparently open as in the present embodiment, but for example, by providing a gap or a hole, Means that the internal pressure of the water storage tank (2) and the outside atmospheric pressure can be equalized.

The bottom of the open water storage tank (2) and the water storage chamber (13) of the first heat exchanger (4) are connected by a communication pipe (5) provided with a check valve (68) in the middle of the pipe. Has been
Thereby, a decrease in water accompanying the generation of steam in the first heat exchanger (4) can be supplemented through the communication pipe (5). In the present embodiment, one end of the communication pipe (5) is connected to the bottom surface of the water storage tank (2), but is not limited to this mode. It may be configured to be connected to the side surface of the tank (2). However, when the connection is made to the side surface, the stored water easily stays at the bottom of the water storage tank (2), and the efficiency of water replacement is reduced. Therefore, it is not preferable. It is preferable to adopt the following configuration.

A ball tap device (30) is provided at an upper position of the open water storage tank (2). That is, a ball tap body (31) is attached to the upper edge portion of the outer peripheral surface of the open water storage tank (2), and an arm (32) extended from the ball tap body (31) is provided in the open water storage tank (2). A floating ball (33) having a specific gravity smaller than that of water is fixedly connected to the tip of the arm (32) while projecting from the upper portion of the internal space and supported in a swingable state. Further, the ball tap body (31) is connected to a water tap via a water purifier (34) and a water softener (35) in that order. The ball tap device (30) is provided with a floating ball (3
If 3) is at a predetermined height, the ball tap body (3)
1) While closing the valve inside to stop water supply, if it is at a position lower than the predetermined height, open the valve and supply water until the position of the floating ball (33) returns to the predetermined height. is there. When the level (n) of the stored water filled in the open water storage tank (2) decreases, the position (height) of the floating ball (33) also becomes lower than the predetermined height. Water is supplied into the water storage tank (2) until the position of the floating ball (33) returns to the predetermined height. By such a mechanism, the water level (n) of the stored water in the open water storage tank (2) is always kept at a fixed position.

The first heat exchanger (4) has a plurality of heat transfer tubes (11)... Parallel to each other at predetermined intervals along an axial direction inside a cylindrical outer shell (10). It is arranged in a shape. The heat medium is introduced into a space (hereinafter, referred to as a “heat medium passage space”) (18) between the heat transfer tubes (11)... To generate heat between the heat transfer tubes (11). The exchange will take place. The upper ends of the heat transfer tubes (11) are connected to a steam storage chamber (12) above the first heat exchanger (4), and the steam storage chamber (12) is connected to the steam flow pipe (6). Through gas-liquid separator (3)
Is connected to On the other hand, the lower ends of the heat transfer tubes (11) are all connected to the water storage chamber (1) below the first heat exchanger (4).
3), and the water storage chamber (13) is connected to the communication pipe (5).
And is connected to the bottom surface of the open water storage tank (2) through the opening. Therefore, the stored water in the open water storage tank (2) passes through the communication pipe (5) and the water storage chamber (13) in this order, and the heat transfer pipe (1).
1) is supplied into the heat transfer tube (11), where the heat is exchanged with high-pressure steam in the heat medium passage space (18) through the heat transfer tubes (11) to be vaporized, and the steam is vaporized. After passing through 12), it is introduced into the steam flow pipe (6).

A circular heat medium inlet (16) is provided at the upper edge of the side surface of the outer shell (10), and the first heat exchanger (4) is inserted through the heat medium inlet (16). The heat medium passage space (18) and the heat medium flow pipe (19) are in communication with each other. Further, a circular heat medium outlet (17) is provided at the lower edge of the side surface of the outer shell (10), and the first heat exchanger (4) is provided through the heat medium outlet (17). The heat medium passage space (18) and the heat medium discharge pipe (20) are in communication with each other. Thus, the high-pressure steam (usually about 5 to 7 kg / cm ² ) supplied from the boiler (22)
After passing through the heat medium flow tube (19) and the heat medium inlet (16) in order, it enters the heat medium passage space (18), where the heat transfer tube (11) passes through the heat transfer tube (11). ) ... heat exchange is performed between the water in the chamber and the water is vaporized. After the heat exchange, the high-pressure steam enters the heat medium discharge pipe (20) through the heat medium discharge port (17), and is provided with a float-type steam trap provided in the middle of the heat medium discharge pipe (20). 2
After being liquefied (warmed) by 1), it passes through the second heat exchanger (23), and at this time, performs heat exchange with the stored water in the open water storage tank (2) to preheat the stored water. After that, it is discharged to the outside as wastewater. As described above, the steam that has been subjected to heat exchange in the first heat exchanger (4) is effectively used for preheating the stored water in the water storage tank (2), so that energy can be saved. There is. The second heat exchanger (23) is of a small type having a configuration similar to that of the first heat exchanger (4). Further, a first pressure gauge (69) is attached to the heat medium flow pipe (19) so that the steam pressure in the heat medium flow pipe (19) can be constantly monitored. Further, a solenoid valve (65) for automating the operation is attached to the heat medium flow pipe (19), and the solenoid valve (65) is connected to an abnormal temperature of low-pressure steam generated by a thermostat (66) described later. It is configured to be closed in response to detection.

On the other hand, the gas-liquid separator (3) is formed of a substantially rectangular parallelepiped container, and the material thereof is not particularly limited, but is preferably made of stainless steel. A first steam supply port (42) is provided on the top wall of the gas-liquid separator (3), and a first steam supply pipe (43) is connected to the first steam supply port (42). A first on-off valve (44) is attached to the first steam supply pipe (43). On the other hand, a steam inlet (40) is provided at the lower edge of one side wall of the gas-liquid separator (3), and the steam feed pipe (6) and the gas-liquid separator are connected through the steam inlet (40). The inside of the vessel (3) is in a communicating state. Further, a plurality of baffle plates (41) are provided in the internal space of the gas-liquid separator (3) in parallel with the top wall of the separation chamber (3) while keeping a predetermined interval from each other. ing. The baffle plates (41) are not bonded to one of the four side walls of the separation chamber (3) but are bonded to the remaining three side walls.
As shown in FIG. 4, the unjoined portions of 1) are alternately arranged at opposing positions on every other baffle plate (41). The vapor introduced into the gas-liquid separator (3) is blocked by a baffle plate (41) and moves in a manner meandering in the internal space of the gas-liquid separator (3). . In the moving process, the introduced steam reverses its moving direction several times. At this time, the steam collides with the side wall of the gas-liquid separator (3) and the baffle plate (41). As a result, the moisture contained in the steam adheres to the side wall and the baffle plate (41)..., The excess moisture in the generated steam is removed, and low-pressure dry steam is generated.
It is supplied from the steam supply port (42).

A second steam supply port (46) is provided at a position of the steam flow pipe (6) on the gas-liquid separator (3) side, and a second steam supply port (46) is provided at the second steam supply port (46). The second steam supply pipe (47) is connected to the second steam supply pipe (47), and the second steam supply pipe (47) is further connected to the second on-off valve (48) and the air release valve (6).
7) is attached. The air vent valve (67) is for releasing the air staying in the steam flow pipe (6) to the outside of the system. In other words, air may stay in the steam flow pipe (6) in the operating state. However, the operation of the apparatus is likely to be unstable. Have been. In particular, since the apparatus tends to be in an unstable state when the apparatus is started up, the air vent valve (67) is connected to the steam flow pipe from the viewpoint of reliably operating the apparatus (1) in a steady state in a shorter time. (6) It is preferable to adopt a configuration provided at a position closer to the supply port side than this. For example, at the time of start-up during operation, the air release valve (67) is opened to release the stagnated air out of the system. On the other hand, when the air stagnates and the operation reaches a steady state, the air release valve (67) is opened. Try to close. As such an air vent valve (67), for example, an air vent valve (AV1 manufactured by Spirax Sarco Co., Ltd.)
Type 3 temperature sensing type automatic air venting valve-for steam).

A thermometer (70) and a pressure gauge (71) are attached to the steam flow pipe (6) so that the steam temperature and pressure in the steam flow pipe (6) can be constantly monitored. It has been made like that. Further, a safety valve (74) is attached to the steam flow pipe (6). When the pressure in the steam flow pipe (6) becomes abnormally high, this is detected and the valve is opened. It is designed to escape vapor and prevent danger. Further, a thermostat (66) is attached to the steam flow pipe (6), and the thermostat (66) turns off the steam when the temperature of the steam in the steam flow pipe (6) becomes higher than a predetermined temperature. Detects and sends a signal from the thermostat (66) to the heat medium delivery pipe (1).
The solenoid valve (65) attached to 9) is closed, whereby the supply of high-pressure steam from the boiler (22) is shut off. The low-pressure steam generated in this way can be prevented from becoming abnormally high temperature.

Further, a drain outlet (49) is provided on the bottom wall of the gas-liquid separator (3), and one end of a recovery pipe (60) is connected to the drain outlet (49). The other end of the recovery pipe (60) opens at an upper position in the open water storage tank (2). With this configuration, water that has adhered to the baffle plates (41) and the side walls and has fallen on the bottom wall of the gas-liquid separator (3) passes through the drain outlet (49) and the recovery pipe (60). And collected in the open water storage tank (2). As described above, liquefied water that is not used as steam can be collected and reused as a raw material of generated steam, and thus there is an advantage that steam production cost can be further reduced.

Further, a temperature sensor (72) is attached to the steam flow pipe (6), and the sensor section (72) is provided.
a) is a steam storage chamber (1) in the steam flow pipe (6).
2) The temperature sensor (7
A flow control valve (73) adapted to control the amount of introduced steam in response to the signal from 2) is provided with a heat medium transmission pipe (19).
Attached to. As a result, the temperature of the generated steam can be controlled with very high precision because the temperature of the generated steam can be monitored one by one and the introduced flow rate of the high-pressure steam as the heat medium can be adjusted so that the generated steam at the desired temperature can be obtained. It is possible to improve the quality.

With at least one of the first opening / closing valve (44) and the second opening / closing valve (48) being opened, the water purifier (3) is passed through the ball tap device (30).
When the purified water is supplied in 4), as shown in FIG.
When the water level (n) in the open water storage tank (2) reaches a predetermined height, the supply is stopped. At this time, the water level (m) in the heat transfer tubes (11) ... of the first heat exchanger (4) is open. The state becomes the same as the water level (n) of the stored water in the water storage tank (2).
On the other hand, when high-pressure steam is introduced from the boiler (22) into the heat medium passage space (18) in the first heat exchanger (4) through the heat medium flow pipe (19) and the heat medium inlet (16). , Heat exchange is performed with the water in the heat transfer tubes (11) through the heat transfer tubes (11), and the water turns into steam to form a steam storage chamber (1).
After passing through 2), it enters the steam flow pipe (6). Since the water in the heat transfer tubes (11) is consumed with the generation of the steam,
The stored water is replenished from the open water storage tank (2) via the communication pipe (5). At this time, since the water storage tank is in the open state, the water level (n) of the stored water in the open water storage tank (2) and the water level (m) in the heat transfer tubes (11) of the first heat exchanger (4). ) Is maintained. The water level (n) in the water storage tank (2) is a ball tap device (30).
Thus, the water level (m) in the heat transfer tube (11) is always maintained at a desired fixed position. In this way, the water level (m) in the heat transfer tube (11) can be always kept at a constant position in the operation state of the apparatus (1), so that the steam in a homogeneous state can be supplied stably and continuously. it can.

In general, when the water level in the heat transfer tubes (11) is directly controlled, it is difficult to control the water level with high precision because the liquid level is boiling and fluctuating. Although it is difficult to obtain a homogeneous steam for this purpose, in the present invention, the water level (m) in the heat transfer tubes (11)... Is indirectly controlled by utilizing the above-described operation principle. Since the water level (m) in the heat transfer tubes (11)... Is controlled by controlling the water level (n) on the water storage tank (2) side where the liquid level does not fluctuate, the heat transfer tubes are extremely accurate. (11) ...
The water level (m) inside can be controlled. Therefore, it is possible to stably and continuously supply steam in an extremely homogeneous state as compared with the related art.

On the other hand, when the generated steam entering the steam feed pipe (6) has the first opening / closing valve (44) closed and the second opening / closing valve (48) open, the second steam is taken out. The air is supplied to the outside via the outlet (46) and the second steam supply pipe (47). The steam supplied in this manner is, for example, low-pressure wet steam (usually 0.05 to 0.2 kg) which is suitably used for performing steaming processing of steamed foods such as meat buns, sashimi, and Japanese sweets.
/ Cm ² ). In addition, it is possible to supply wet steam of 105 ° C. or less, which is suitable for steaming food products.

On the other hand, when the second opening / closing valve (48) is closed and the first opening / closing valve (44) is open, the generated steam that has entered the steam delivery pipe (6) is It is introduced into the gas-liquid separator (3) via the port (40).
At this time, the steam introduced from the steam feed pipe (6) collides with the side wall and the baffle plate (41) of the gas-liquid separator (3), whereby moisture contained in the steam is removed from the side wall and the baffle plate. (41) ...
Adheres to By such adhesion of moisture, excess moisture in the generated steam is removed, and low-pressure dry steam is generated. The first steam outlet (42) and the first steam supply pipe (4)
It is supplied to the outside through 3). The steam supplied in this manner is, for example, low-pressure dry steam (usually 0.05 wt.
０．２0.2 kg / cm ² ). In addition, it is possible to supply wet steam of 105 ° C. or less, which is suitable for thawing and thawing heating of frozen foods.

As described above, with one apparatus (1), dry steam and wet steam can be selected and supplied stably and continuously in an extremely homogeneous state. Therefore, both the installation space and the equipment cost can be significantly reduced as compared with the case where two dry steam supply devices and wet steam supply devices are installed and used.

Further, when both the first opening / closing valve (44) and the second opening / closing valve (48) are open, it is possible to supply dry steam through the first steam supply pipe (43).
Since the wet steam can be supplied through the second steam supply pipe (47), both of the dry steam and the wet steam can be simultaneously and stably and continuously obtained in a very uniform state with one device (1). For example, steaming of steamed food and thawing and heating of frozen food can be performed simultaneously and in parallel by a single device. Therefore, taking the example of school lunch cooking at an elementary school or the like, there is an advantage that the processing time can be greatly reduced by such simultaneous progress.

The use of the steam supply device (1) of the present invention is not particularly limited, but it can supply low-pressure steam suitable for heating food, so that it is particularly suitably used for heating food.

In supplying steam using the steam supply device (1) of the present invention, the open water storage tank (2) is used.
If the scent component is added to the water stored in the food, the desired scent can be simultaneously imparted to the food to be heated. Therefore, since it is not necessary to provide a separate process for flavoring, the added value of the food to be heated can be further improved at low cost.

[0033]

As described above, according to the steam supply apparatus of the present invention, when water is consumed with the generation of steam in the heat transfer tube of the first heat exchanger, the water is stored from the water storage tank through the communication pipe. Water is replenished into the heat transfer tube, but since the water storage tank is open, if at least one of the two steam outlets is open, the water level of the stored water in the water storage tank and the heat transfer The water level in the pipe can be kept in a state that matches. At this time, since the water level in the water storage tank is maintained at a constant height, the water level in the heat transfer tube can always be maintained at a desired position. In addition, it does not directly control the water level in the heat transfer tube where the liquid level fluctuates sharply due to boiling, but controls the water level on the heat transfer tube side by controlling the water level on the water storage tank side where the liquid level does not fluctuate. Since the water level is controlled, that is, the water level on the heat transfer tube side is indirectly controlled, the water level in the heat transfer tube can be controlled with extremely high accuracy. Therefore, it is possible to stably and continuously supply extremely homogeneous steam. In addition, the above-described effect can be enjoyed only by configuring such that the water level on the water storage tank side can be controlled to be constant, and a special device group for controlling the water level in the heat transfer tube to be constant. Since it is not necessary to provide the device, it is possible to sufficiently reduce the size of the entire device.

Further, the first heat exchanger and the gas-liquid separator are connected to each other via a steam feed pipe, and the first steam outlet is connected to the gas-liquid separator, and the second steam outlet is connected to the steam feed pipe. Since the outlet is provided, dry steam can be obtained from the first steam outlet, and wet steam can be obtained from the second steam outlet. Therefore, with this one steam supply device, it is possible to appropriately select dry steam or wet steam in an extremely homogeneous state, or to supply dry steam and wet steam simultaneously, stably and continuously.

When the level of the water stored in the open water storage tank is kept constant by the ball tap, the ball tap is simple and requires a small equipment space. The overall size can be reduced more sufficiently, and the demand for space saving can be sufficiently satisfied.

Further, one or more baffles are provided in the gas-liquid separator in such a manner as to block the flow of the generated steam to be introduced, so that excess water in the steam is removed. In this case, excess water can be easily removed simply by providing a baffle plate inside the container, so that further space saving can be achieved with lower equipment cost.

Further, while the second heat exchanger is disposed in the open water storage tank, the steam supplied from the boiler and having completed the heat exchange in the first heat exchanger is liquefied, and then the second heat exchanger is liquefied.
When introduced into the heat exchanger so that the stored water in the open water storage tank can be preheated, the high-pressure steam that has completed the heat exchange in the first heat exchanger is further discharged into the open water storage tank. Since it is effectively used for preheating of the stored water, energy saving can be achieved, and extremely homogeneous steam can be supplied stably and continuously at lower cost.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a steam supply device according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a first heat exchanger.

FIG. 3 is a sectional view taken along line AA in FIG.

FIG. 4 is a sectional view showing a gas-liquid separator.

[Description of Signs] 1 ... Steam supply device 2 ... Open water storage tank 3 ... Gas-liquid separator 4 ... First heat exchanger 5 ... Communication tube 6 ... Steam transfer tube 11 ... Heat transfer tube 21 ... Steam trap 22 ... Boiler 23 … Second heat exchanger 30… ball tap device 41… baffle plate 42… first steam outlet 46… second steam outlet

Continuation of the front page (56) References JP-A-10-246401 (JP, A) JP-A-57-25819 (JP, A) JP-A-63-267243 (JP, A) JP-A-63-38801 (JP, A) , A) JP-A-6-62960 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F22B 1/08 A47J 27/00-29/06

Claims (4)

(57) [Claims] 1. An open water storage tank in which the level of water stored in a tank is maintained at a constant level, a plurality of heat transfer tubes are disposed inside, and water in the heat transfer tubes is provided. A first heat exchanger capable of exchanging heat with high-pressure steam from the boiler; an extra water in the generated steam to be introduced is removed; and a first steam outlet is provided. A vapor-liquid separator provided, wherein an upper end of the heat transfer tube and the gas-liquid separator are connected to each other by a steam flow pipe, and a second steam outlet is provided in the steam flow pipe. The lower end of the heat transfer tube and the open water storage tank are connected to each other by a communication pipe so that the water level of the stored water in the open water storage tank matches the water level in the heat transfer tube of the first heat exchanger. A steam supply device, characterized in that: 2. The steam supply device according to claim 1, wherein the level of the water stored in the open water storage tank is kept constant by a ball tap. 3. One or more baffles are provided in the gas-liquid separator in such a manner as to obstruct the flow of the generated steam to be introduced, so that excess moisture in the steam is removed. The steam supply device according to claim 1. 4. A second heat exchanger is disposed in the open water storage tank, and after the steam supplied from the boiler and having completed heat exchange in the first heat exchanger is liquefied, the second heat exchanger is liquefied. The steam supply device according to any one of claims 1 to 3, wherein the steam supply device is introduced into the heat exchanger so as to preheat stored water in the open water storage tank.