JP2003074801A - Saturated steam generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a saturated steam generator capable of reheating the inlet side of a heat transfer tube of a thermal storage part to a sufficient temperature. SOLUTION: This saturated steam generator 30 is equipped with a thermal storage tank 32 and a saturated steam generating tank 34, and heats the water in the saturated steam generating tank 34 by the superheated steam that is superheated in the thermal storage tank 32 and obtained, so as to generate saturated steam. In the thermal storage part 72 filled with a solid thermal storage material 77 and a liquid thermal storage material 80 that are provided in the thermal storage tank 32, a heater 74 heating the solid thermal storage material 77 and the liquid thermal storage material 80 and a heat transfer tube 76 superheating the water passing through the inside to form superheated steam are provided. The heater 74 is provided to heat the solid thermal storage material 77 and the liquid thermal storage material 80 in such a manner that the temperature of the water inlet side of the heat transfer tube 76 is higher than that of the discharge outlet side oft he superheated steam.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a saturated steam generator, and more particularly to a saturated steam generator which uses superheated steam as a heating source to generate saturated steam.

[0002]

2. Description of the Related Art In hospitals and the like, therapeutic bandages, scalpels, forceps,
For sterilization of items to be sterilized such as surgical gowns, a steam sterilization method is usually used in which the sterilization chamber containing the items to be sterilized is pressurized with saturated steam and kept at a predetermined pressure and temperature for a certain period of time. There is. Among the steam sterilizers used in such a steam sterilization method, a large steam sterilizer capable of sterilizing a large amount of objects to be sterilized is usually supplied with saturated steam from a large boiler provided in a hospital or the like. It

However, since a large boiler is accompanied by burning of kerosene, it is not appropriate from the viewpoint of environmental protection, and noise during driving also poses a problem. Therefore, the present inventors, as shown in FIG. 5, can reduce the size of the heating source in the saturated steam generator that generates saturated steam, are environmentally friendly, and can reduce the operating noise to a very low level. In addition, we have come up with a saturated steam generator that can reduce running costs.

An outline of the structure of the saturated steam generator shown in FIG. 5 will be described. This saturated steam generator includes a heat storage tank 10,
And a saturated steam generation tank 12. In the heat storage tank 10, a heat storage unit 11 made of a solid heat storage material and a liquid heat storage material is provided. A heat transfer tube 16 is arranged in the heat storage section 11, and water is supplied into the heat transfer tube 16 by the pump 14. The water that has passed through the heat transfer tube is overheated, becomes superheated steam, and is a heater 2 arranged in the saturated steam generation tank 12.
It is supplied within 0. On the other hand, the water that is the source of the saturated steam supplied to the evaporation tank 18 is treated water that has been subjected to water treatment such as microfiltration and deionization, and is supplied to the evaporation tank inside 18 by the pump 9 through the pipe 8. Has been done.

FIG. 6 shows the structure of a conventional heat storage tank. The heat storage tank 10 is provided with the heat storage unit 11 as described above, and an electric heater 15 provided so as to pass through the heat storage unit 11 and heat the inside of the heat storage unit 11. Here, each electric heater 15 shown is provided so as to be capable of heating the whole of the heat transfer tube 16 over the water inlet side and the superheated steam outlet side. The heating of the heat storage tank 10 is performed by mainly supplying an inexpensive electric power to the electric heater 15 at midnight. If power is applied for about 10 hours at midnight, then the heat storage tank 1
From 0 to 7 hours and a half to 8 hours, superheated steam of about 500 ° C. is stably obtained.

[0006]

In the saturated steam generator having the above structure, the water passing through the heat storage tank absorbs the most heat from the heat storage section at the inlet side of the heat transfer tube. Therefore, the temperature of the heat storage section at this position is most likely to drop. Therefore, during the saturated steam generation process, there is a problem in that the inlet side of the heat transfer tube of the heat storage tank is intensively reheated to maintain the temperature of the entire heat storage tank at a constant temperature.

Further, regarding the fluctuation of the water quality of the treated water, no consideration is given to the operation of the saturated steam generator, and there is a possibility that it is required to deal with the deterioration of the water quality.

Further, the water supply to the heat storage tank has been performed by turning the pump on and off, but the overshoot and undershoot of the generation of the saturated steam become large only by controlling the pump on and off, so that it is stable. There is also a problem that the generation of saturated steam is desired.

Since water is supplied to the heat storage tank and treated water is supplied to the saturated steam generation tank by separate pumps, there are many moving parts, and it is necessary to improve maintainability. , The problem that reduction of the number of parts of the device is also desired, and the treated water that overflowed in the conventional saturated steam generation tank is drained as it is,
There were also problems such as wasted disposal of treated water and high running costs.

Therefore, the present invention has been made to solve the above problems, and an object thereof is to provide a saturated steam generator capable of reheating the inlet side of the heat transfer tube of the heat storage section to a sufficient temperature, and the quality of treated water. It is an object of the present invention to provide a saturated steam generator that can be operated in consideration of fluctuations in the above, and a saturated steam generator that can stably generate saturated steam.

[0011]

The present invention has the following constitution in order to solve the above problems. That is, according to the saturated steam generator of the present invention, the saturated steam generation tank is provided with a heat storage tank, and the water in the saturated steam generation tank is heated by the superheated steam obtained by overheating in the heat storage tank. Is a saturated steam generator for generating saturated steam, and heats the solid heat storage material and the liquid heat storage material in a heat storage section that is filled with a solid heat storage material and a liquid heat storage material provided in the heat storage tank. A heater and a heat transfer tube that superheats water passing through it to become superheated steam are provided, and the heater has a temperature higher than that of the discharge port side of the superheated steam that is overheated on the water inlet side of the heat transfer tube. In addition, the solid heat storage material and the liquid heat storage material can be heated. By adopting this configuration, it is possible to sufficiently reheat the inlet side of the heat transfer tube whose temperature is significantly lower than that of other parts, and to make the temperature in the heat storage tank uniform.

[0012] Further, the heater has a plurality of heaters so that at least the water inlet side of the heat transfer tube and the outlet side of the superheated steam that has been overheated can heat the solid heat storage material and the liquid heat storage material by separate heaters. According to what is provided,
It is possible to efficiently reheat the inlet side of the heat transfer tube. Further, among the plurality of heaters, one heater arranged on the water inlet side of the heat transfer tube has a higher temperature than the other heater arranged on the discharge port side of the overheated steam. With the feature, it is possible to sufficiently reheat the inlet side of the heat transfer tube.

According to the saturated steam generating apparatus of the present invention, the saturated steam generating tank is provided with a heat storage tank and the saturated steam generating tank, and the water in the saturated steam generating tank is heated by the superheated steam obtained by overheating in the heat storage tank. Is a saturated steam generator for generating saturated steam, wherein the solid heat storage material and the liquid heat storage material provided in the heat storage tank are filled in the heat storage portion, and the solid heat storage material and the liquid heat storage material are heated. Is provided with a heater and a heat transfer tube that superheats the water passing through it into superheated steam, and supplies water to the saturated steam generation tank to generate saturated steam by contacting the superheated steam supplied from the heat transfer tube. A storage tank for temporarily storing the water is provided at an intermediate portion of the water supply pipe to be used, and a water quality measuring unit for measuring the quality of the supplied water is provided in the saturated steam generation tank and / or the storage tank. As . By adopting this configuration, it is possible to provide clean saturated steam by controlling the quality of water that generates saturated steam.

Further, when the water quality measuring means determines that the quality of the water to be saturated steam is lowered, it comprises first control means for controlling so as to stop the operation of generating saturated steam. Therefore, the quality of saturated steam can be improved more reliably, and only clean saturated steam can be provided. Further, when the overflow pipe for returning the water overflowed in the saturated steam generation tank to the storage tank is provided, it is possible to prevent the overflowed water from being discarded and waste the water. By not doing so, the running cost can be reduced. The saturated steam generation tank is provided with a steam supply pipe for discharging the saturated steam generated in the saturated steam generation tank,
If a drain pipe for discharging the drain condensed in the steam supply pipe from the steam supply pipe and returning it to the storage tank is provided, the drain in the steam supply pipe is reused without being discarded,
The running cost can be reduced by not wasting water.

According to the saturated steam generator of the present invention, it is provided with a heat storage tank and a saturated steam generation tank, and the superheated steam obtained by overheating in the heat storage tank heats water in the saturated steam generation tank. Is a saturated steam generator that generates saturated steam, and heats the solid heat storage material and the liquid heat storage material in a heat storage section that is filled with a solid heat storage material and a liquid heat storage material provided in the heat storage tank. A heater and a heat transfer tube that superheats water passing through it into superheated steam are provided, a water supply pump for supplying water to the heat transfer tube is provided, and the saturated steam pressure generated in the saturated steam generation tank is provided. Second control for controlling the feed water pump so that the saturated water vapor pressure value measured by the pressure measuring means is input and the saturated water vapor pressure value is always constant Is characterized in that stage is provided. By adopting this configuration, more stable saturated steam output can be expected.

The water supply pump is branched on the downstream side to supply water to the heat transfer pipe and the saturated steam generation tank, and the branch destinations are connected to the heat transfer pipe and the saturated steam generation tank, respectively. Since one water supply pipe is provided, the number of water supply pumps that are operating parts can be reduced to one compared with the conventional one, and maintenance can be facilitated and the number of parts can be reduced.

[0017]

FIG. 1 is a schematic diagram showing an example of a saturated steam generator according to the present invention. The saturated steam generator 30 shown in FIG. 1 includes a heat storage tank 32 and a saturated steam generator tank 34.
And. First, the water supply system will be described.
The water to be overheated in the heat storage tank 32 of the saturated steam generating device 30 and the water that becomes saturated steam in the saturated steam generating tank 34 are both pure water subjected to microfiltration and deionization, RO (reverse) osmosis) Water, treated water such as soft water is used. And the water supply source pipe 3 for supplying the treated water
5 is for the heat storage tank 32 and for the saturated steam generation tank 34, and only one is provided in total.

The water source pipe 35 is connected to a storage tank 36,
The supplied treated water is temporarily stored here. Storage tank 36
A water supply pipe 38 for supplying water from both the heat storage tank 32 and the saturated steam generation tank 34 is connected. A strainer 39 is provided in the middle of the water supply pipe 38. The water supply pipe 38 is provided with a water supply pump 40, and the water supply pump 40 causes the treated water to store the treated water in the heat storage tank 32 and the saturated steam generation tank 3.
Transferred to 4.

The water supply pipe 38 is branched downstream of the water supply pump 40 into a heat storage tank side water supply pipe 42 directed to the heat storage tank 32 and a generation tank side supply pipe 44 directed to the saturated steam generation tank 34. The heat storage tank side water supply pipe 42 has a motor valve 45
Is provided, and the tip of the heat transfer tube 76 (see FIG.
(See FIG. 4). The generation tank side supply pipe 44 is
A motor valve 47 is provided on the way, and its tip is connected to the saturated steam generation tank 34.

Next, a steam supply system for superheated steam superheated in the heat storage tank 32 will be described. As I explained earlier,
The heat storage tank side water supply pipe 42 to the heat storage tank 32 is connected to one end portion (reference numeral 76 a in FIG. 2) of the heat transfer pipe 76 in the heat storage tank 32, and the treated water is supplied into the heat transfer pipe 76. The treated water passing through the inside of the heat transfer tube 76 is superheated by the heat storage section 72 and becomes superheated steam (Superheated Vapor). A supply pipe 46 for supplying the superheated steam to the saturated steam generation tank 34 is connected to the other end portion (reference numeral 76b in FIG. 2) of the heat transfer pipe 76.

The supply pipe 46 is connected to one end of a heating pipe 48 in the saturated steam generation tank 34 and supplies superheated steam into the heating pipe 48. The heating pipe 48 is arranged inside the saturated steam generation tank 34, and a small hole is formed on the outer surface thereof.
Superheated steam can be ejected from this small hole. The superheated steam ejected from the heating pipe 48 is the saturated steam generation tank 3
The treated water stored in 4 is directly heated to evaporate the treated water and generate saturated steam. The superheated steam jetted into the treated water stored in the saturated steam generation tank 34 is drained as a result of heat exchange and returns to water.

Next, a system for supplying and discharging treated water to the saturated steam generation tank 34 will be described. As described above, the generation tank side water supply pipe 44 is connected to the saturated steam generation tank 34 and supplies the treated water into the saturated steam generation tank 34. The treated water heated by the superheated steam ejected from the heating pipe 48 is converted into saturated steam and steamed from the steam supply pipe 50.
An emergency drain pipe 51 is connected to the saturated steam generation tank 34.

If the amount of treated water stored in the saturated steam generation tank 34 exceeds a predetermined amount, it is not preferable in terms of steam generation efficiency. Therefore, an overflow pipe 52 is provided to discharge the treated water when the amount exceeds the predetermined amount. . A valve 54 and a drain trap 56 are provided in the middle of the overflow pipe 52, and a tip portion thereof is connected to a storage tank heat transfer pipe 58 arranged in the storage tank 36. Storage tank heat transfer tube 5
8 is provided so as to be immersed in the treated water stored in the storage tank 36, and heat exchange is performed between the overflowed water and the water in the storage tank 36. That is, the storage tank 36
The treated water in the generation tank 34 that has overflowed due to the water in the inside is cooled, and the treated water stored in the storage tank 36 is heated by the heat of the overflowed processed water that passes through the inside of the storage tank heat transfer tube 58. . As described above, by heating the treated water in the storage tank 36, it is possible to improve the thermal efficiency and deaerate the treated water in the storage tank 36.

The tip of the storage tank heat transfer tube 58 is open in the storage tank 36, and is provided so that the treated water in the overflow generation tank 34 and the treated water supplied from the water supply source pipe 35 are mixed. Has been. Therefore, the overflowed treated water in the generation tank 34 can be reused as superheated steam or saturated steam. In addition, overflow pipe 5
A valve 60 for pressure relief is provided between the heat storage tank side water supply pipe 42 and the heat storage tank side water supply pipe 42.

The saturated steam generated in the saturated steam generation tank 34 is output through the steam supply pipe 50. Although not shown in the drawing, the saturated steam generation tank 34 and the steam supply pipe 50
A structure such as a baffle or a cyclone, which is a known technique as a means for preventing entrainment of droplets, is preferably provided between and. However, the baffle and the cyclone are not the only means for preventing entrainment.

A drain trap 69 is provided in the steam supply pipe 50 midway to trap the drain condensed in the steam supply pipe 50. Further, a drain pipe 71 for returning the drain trapped by the drain trap 69 into the water storage tank 36 is provided so as to be branched from the steam supply pipe 50. The drain pipe 71 is connected to a midway portion of the overflow pipe 52 and opens in the storage tank 36 via the storage tank heat transfer pipe 58 arranged in the storage tank 36. With such a configuration, the temperature inside the storage tank 36 can be increased, the thermal efficiency can be increased, and deaeration can be performed. On the other hand, the drain produced by condensation in the steam supply pipe 50 is stored in the storage tank 36.
It can be reused by using it as superheated steam or as saturated steam, and the treated water can be effectively used and not wasted.

Next, a control system for generating saturated steam will be described. Water quality detection means 62, 64 for detecting the quality of the treated water are provided in the storage tank 36 and the saturated steam generation tank 34 at the portion where the treated water is stored. As an example of the water quality detecting means 62, 64, there are two electrodes 62a, 62b and 64a, 64, respectively.
An electrode switch having b is mentioned. The electrode switch detects the resistance value (electrical conductivity) of the treated water and determines that the impurities increase as the resistance value decreases. The water quality detecting means 62 and 64 are connected to the control unit 66, and the control unit 66 determines the water quality. The control unit 66 measures the resistance value between each of the two electrodes,
When it is determined that the resistance value has decreased and the water quality has deteriorated, the operation of the saturated steam generator can be stopped. Therefore, the water quality of the saturated steam can be maintained at a constant level.

The pressure gauge 70 provided in the steam supply pipe 50 for outputting saturated steam from the saturated steam generation tank 34 is connected to the control unit 66, and the pressure of the generated saturated steam is input to the control unit 66. By doing so, feedback control is performed. The control unit 66 controls the water supply pump 40 via the inverter 68 so that the saturated steam having a constant pressure is always output based on the measured saturated steam pressure. As described above, the control unit 66 of the present embodiment serves both as the first control unit and the second control unit in the claims, and controls the water quality maintenance and outputs the saturated steam pressure constant. Although it has both control functions of the control described above, it may be possible to provide two control units having different functions. Further, in addition to the control based on the pressure of the saturated steam generated as described above, the control unit 66
Measures the amount or temperature of the generated saturated steam,
The water supply pump 40 may be controlled based on these measured values. The control of the water supply pump 40 is not limited to the inverter 68, and the control valve can be moved by a motor,
The orifice may be adjusted.

The heat storage tank 32 used in the above-described saturated steam generator will be described with reference to FIG. In addition,
Hereinafter, a mode in which an electric heater is used as an example of a heater for heating the heat storage tank will be described, but the heater for heating the heat storage tank is not limited to the electric heater. Besides the electric heater, a steam heater, an oil heater, etc. can be considered. In the heat storage tank 32 shown in FIG. 2, an electric heater 74 for heating the heat storage material and treated water are supplied into a heat storage part 72 which is filled with a heat storage material in which a solid heat storage material and a liquid heat storage material are mixed. A heat pipe 76 is provided. Furthermore, the outer peripheral surface of the heat storage section 72 is covered with a heat insulating material 78 to prevent heat release from the heat storage section 72. A solid heat storage material having a different particle size and a liquid heat storage material are used as the heat storage material filled in the heat storage section 72, and the solid heat storage material having a different particle size is formed into a small particle in a gap between the solid heat storage material having a large particle size. The solid heat storage material having a diameter is filled so as to enter, and the liquid heat storage material is filled in a gap between the solid heat storage material having a large particle diameter and the solid heat storage material having a small particle diameter.

FIG. 3 shows the state of filling the heat storage material in the heat storage section 72. FIG. 3A shows a state in which a solid heat storage material 77a having a large particle size and a solid heat storage material 77b having a small particle size are filled with two types of solid heat storage materials and a liquid heat storage material 80, The solid heat storage material 77a having a small particle diameter is inserted and filled in the gap of the solid heat storage material 77a having a large particle diameter,
A liquid heat storage material 80 is filled in the gap 77b.

Further, FIG. 3B shows a state of the heat storage part 72 filled with the solid heat storage material having three kinds of particle diameters and the liquid heat storage material 80. This solid heat storage material is a solid heat storage material 77 having a large particle size.
a, a small-sized solid heat storage material 77b and a solid heat storage material 77a,
The solid heat storage material 77c having a medium particle diameter, which is an intermediate particle diameter of 77b, is filled with the solid heat storage material 77c having a medium particle diameter in a gap of the solid heat storage material 77a having a large particle diameter. Solid heat storage material 7 of small particle size in the gap between 77a and 77c
It is filled so that 7b may enter. Further, a liquid heat storage material 80 is filled in the gap between the filled solid heat storage materials 77a, 77b, 77c. Thus, FIG. 3 (a)
As shown in (b), the solid heat storage materials having different particle sizes are filled so that the solid heat storage material having a small particle size enters the gap between the solid heat storage materials having a large particle size, and the liquid heat storage material is stored in the gap between the solid heat storage materials. In the heat storage part 72 filled with the material, the packing densities of the solid heat storage material and the liquid heat storage material can be improved as compared with the packing densities of the solid heat storage material and the liquid heat storage material having substantially the same particle size, The quantity and heat transfer to the heat transfer tube 76 can be improved.

As the solid heat storage material shown in FIGS. 3 (a) and 3 (b), one or more kinds of granules selected from magnesia, magnetite, silica and alumina can be preferably used. A nitrate can be preferably used for the above. Nitrate is a solid at room temperature
It melts and becomes a liquid above ℃. As an example of the composition of the heat storage material forming the heat storage section 42, a large particle size magnesia 55 is used.
%, Small particle size magnesia 25%, and nitrate 20% are preferred.

The electric heater 74 provided in the heat storage section 42 is formed by disposing three electric heaters so as to have a total electric capacity of 27 kW. As a specific example, if the electric power capacity that can be used in the entire heat storage tank 32 is 27 kW, the electric heater provided in the heat storage tank 32 includes one 15 kW electric heater 74a and 6 kW electric heaters 74b and 74c.
Make sure there are two. Among them, the electric heater 74a having the highest electric capacity of 15 kW is provided so as to be located on the inlet side (the reference numeral 76a side) of the heat transfer tube 76,
The remaining 6 kW electric heaters 74b and 74c are provided so as to heat the middle portion of the heat transfer tube 76 and the discharge port side (reference numeral 76b) side, respectively. As described above, by disposing the electric heater having the highest temperature on the inlet side of the heat transfer tube 76, the inlet side of the heat transfer tube 76 can be heated intensively.
That is, during the operation of generating saturated steam, the heat transfer tube 7 is
Since there is a decrease in the temperature on the inlet side of No. 6, it is possible to focus reheating only on the inlet side.

Another embodiment of the arrangement of the electric heater will be described with reference to FIG. That is, in the arrangement of the electric heaters 74 of the above-described embodiment, the total power consumption is the same as that of the conventional one, and the distribution thereof is inclined so that the heat transfer tube 76 introduction port side becomes larger.
However, it is preferable to use different electric heaters for heat storage using late-night power and for reheating the inlet side where the temperature drop is remarkable. That is, the arrangement of the electric heater 82 is 3 kW of the 9 kW electric heaters 82a, 82b, 82c.
By using a book to store heat using late-night power,
In addition to the electric heater of the book, an electric heater 82d for heating only the inlet side is provided. The electric capacity of the electric heater 82d that heats only the inlet side is 27 k so that all the electric power that can be used for the entire heat storage tank 32 can be used.
Set to W. That is, during reheating after or after the generation of saturated steam, by energizing only the electric heater 82d, it is possible to reheat the inlet side where the temperature drop is particularly remarkable.

Further, as another embodiment of the arrangement of the electric heaters, three electric heaters having the same electric capacity may be arranged on the introduction port side, the intermediate portion, and the discharge port side so that they can be independently controlled. (Not shown). Even in the case of such an arrangement, it is possible to heat only the introduction port side.

By using the electric heaters 74 and 82, the heat storage material can be heated by electricity which is clean energy, and the heat storage material can be heated by low-cost midnight power, so that clean and inexpensive overheated steam can be generated. Obtainable. Here, the superheated steam is continuously supplied for 8
A normal boiler capable of discharging for more than a time, that is, a boiler that cooks fuel such as heavy oil requires auxiliary equipment such as a fuel tank, a fuel pipe, an air duct, and an exhaust gas duct, and its size becomes extremely large. In this respect, in the heat storage tank 32 shown in FIGS. 2 and 4, since the electric heaters 74 and 82 are used as the heaters for heating the heat storage material, auxiliary equipment such as a fuel tank can be eliminated, and the heat storage tank is extremely compact. Can be

In the embodiment described above, the superheated steam is brought into direct contact with the treated water stored in the saturated steam generating tank 34 (bubbling heating), but the superheated steam is treated for generating saturated steam. Without direct contact with water,
You may make it heat by exchanging heat through the tube for heating (indirect heating).

Further, the specific numerical value of the electric capacity of the heater according to the above-mentioned embodiment is described only as an example, and is not limited to the heater having the numerical value as described above. Further, the water quality detecting means is not limited to the electrode switch, and any means capable of detecting the water quality may be used.

[0039]

EFFECT OF THE INVENTION The saturated steam generator according to the present invention uses a solid heat storage material and a liquid heat storage material so that the heater has a temperature higher than that of a discharge port side of superheated steam on the water inlet side of the heat transfer tube. Since it is provided so that it can be heated, it is possible to sufficiently reheat the inlet side of the heat transfer tube where the temperature drop is more remarkable than other parts. In addition, by providing a plurality of heaters, at least the solid heat storage material and the liquid heat storage material of the water inlet side of the heat transfer tube and the discharge side of the superheated steam that has been overheated can be heated by separate heaters, It is possible to efficiently reheat the inlet side of the heat transfer tube. Further, among the plurality of heaters, one heater arranged on the water inlet side of the heat transfer tube has a higher temperature than the other heater arranged on the outlet side of the overheated steam. Characteristically, the inlet side of the heat transfer tube can be efficiently and sufficiently reheated.

According to the saturated steam generator of the present invention, a storage tank for temporarily storing water is provided in the middle of a water supply pipe for supplying water to the saturated steam generation tank. Since the storage tank is provided with water quality measuring means for measuring the quality of the supplied water, it is possible to provide clean saturated steam by controlling the quality of water that produces saturated steam. Further, when the water quality measuring unit measures that the water quality of the water to be saturated steam has deteriorated, it is provided with the first control unit for controlling so as to stop the operation of the saturated steam generation. It is possible to reliably improve the quality of saturated steam and provide only clean saturated steam. Further, by providing the overflow pipe for returning the overflowed water in the saturated steam generation tank to the storage tank, it is possible to prevent the overflowed water from being discarded and to prevent the water from being wasted and to reduce the running cost. It can be reduced. Since the drain pipe for discharging the drain condensed in the steam supply pipe to the storage tank and returning it to the storage tank is reused without discarding the drain in the steam supply pipe, water is wasted. It is possible to reduce the running cost by not doing so.

According to the saturated steam generator of the present invention, the saturated steam pressure value measured by the pressure measuring means is input, and the second control means for controlling the water supply pump based on the saturated steam pressure value is provided. Therefore, a more stable output of saturated steam can be expected. In addition, since only one water supply pump that feeds water to the heat transfer tube and the saturated steam generation tank is provided in common, the number of water supply pumps that are operating parts is reduced to one compared with the conventional one, and maintenance is easy. The number of parts can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic diagram illustrating an example of a saturated steam generator according to the present invention.

FIG. 2 is a cross-sectional view for explaining the structure of the heat storage tank used in FIG.

FIG. 3 is an explanatory diagram illustrating a state of filling a heat storage material in a heat storage unit.

FIG. 4 is a cross-sectional view showing another embodiment of the structure of the heat storage tank.

FIG. 5 is a schematic diagram illustrating a conventional saturated steam generator.

FIG. 6 is a cross-sectional view for explaining the structure of a heat storage tank used in a conventional saturated steam generator.

[Explanation of symbols]

30 Saturated steam generator 32 heat storage tank 34 Generation tank 35 Water source pipe 36 Storage tank 38 Water pipe 39 Strainer 40 water pump 42 Heat storage tank side tube 44 Saturated steam generation tank side tube 45, 47, 60 valves 46 Supply pipe 48 heating tube 50 steam supply pipe 51 drain pipe 52 Overflow piping 56,69 drain trap 58 Storage tank heat transfer tube 62,64 Water quality detection means 66 control unit 68 Inverter 71 Drain piping 72 Heat storage part 74,82 Electric heater 76 heat transfer tube 77a, 77b, 77c Solid heat storage material 78 Insulation 80 Liquid heat storage material

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F28D 20/00 B

Claims (9)

[Claims] 1. A heat storage tank and a saturated steam generation tank are provided,
A saturated steam generator that heats water in a saturated steam generation tank by superheated steam obtained by being overheated in the heat storage tank to generate saturated steam, wherein a solid heat storage material and a liquid provided in the heat storage tank In the heat storage section filled with the heat storage material, a heater that heats the solid heat storage material and the liquid heat storage material, and a heat transfer tube that superheats water passing through to become superheated steam are provided, and the heater is The saturated steam generation is characterized in that the solid heat storage material and the liquid heat storage material can be heated so that the water inlet side of the heat transfer tube becomes higher in temperature than the discharge side of the superheated steam that has been overheated. apparatus. 2. A plurality of heaters are provided such that at least the solid heat storage material and the liquid heat storage material on the water inlet side and the superheated steam outlet side of the heat transfer tube can be heated by separate heaters. The saturated steam generator according to claim 1, wherein the saturated steam generator is provided. 3. One of the plurality of heaters disposed on the water inlet side of the heat transfer tube has a higher temperature than other heaters disposed on the outlet side of the overheated steam. The saturated steam generator according to claim 2, wherein 4. A heat storage tank and a saturated steam generation tank are provided,
A saturated steam generator that heats water in a saturated steam generation tank by superheated steam obtained by being overheated in the heat storage tank to generate saturated steam, wherein a solid heat storage material and a liquid provided in the heat storage tank. In the heat storage part filled with the heat storage material, a heater for heating the solid heat storage material and the liquid heat storage material, and a heat transfer tube for superheating water passing through the inside to be superheated steam are provided. A storage tank for temporarily storing the water is provided in the middle of a water supply pipe that supplies water that generates saturated steam by contacting with superheated steam supplied from the saturated steam generation tank. A saturated water vapor generator characterized in that the storage tank is provided with water quality measuring means for measuring the quality of the supplied water. 5. When the water quality measuring means measures that the water quality of the water to be saturated steam has deteriorated, it comprises a first control means for controlling to stop the operation of generating saturated steam. The saturated steam generator according to claim 4, wherein 6. The saturated steam generator according to claim 4, further comprising an overflow pipe for returning water overflowing in the saturated steam generation tank to the storage tank. 7. The saturated steam generation tank is provided with a steam supply pipe for discharging saturated steam generated in the saturated steam generation tank, and drains condensed in the steam supply pipe are discharged from the steam supply pipe to store the water. The saturated steam generator according to claim 4, 5 or 6, characterized in that a drain pipe for returning to the tank is provided. 8. A heat storage tank and a saturated steam generation tank are provided,
A saturated steam generator for heating water in a saturated steam generation tank to generate saturated steam by superheated steam obtained by overheating in the heat storage tank, wherein a solid heat storage material and liquid heat storage provided in the heat storage tank. In the heat storage section formed by filling the material with a material, a heater that heats the solid heat storage material and the liquid heat storage material, and a heat transfer tube that superheats water passing through the inside to become superheated steam are provided, A water supply pump for supplying water is provided, pressure measuring means for measuring the saturated water vapor pressure generated in the saturated water vapor generating tank is provided, and the saturated water vapor pressure value measured by the pressure measuring means is input, A saturated steam generator, comprising second control means for controlling the water supply pump so that the saturated steam pressure value is always constant. 9. The water supply pump branches downstream to supply water to the heat transfer tube and the saturated steam generation tank, and the branch destinations are connected to the heat transfer tube and the saturated steam generation tank, respectively. The saturated water vapor generator according to claim 8, wherein one is provided in the water supply pipe.