JPH0723763B2 - Steam generator - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam generator that applies vapor latent heat of vapor to a gas or a liquid to heat it.

2. Description of the Related Art As a steam generator for heating a gas or a liquid by utilizing latent heat of condensation of steam, a steam consuming type used for a heating source such as a steam iron and a heating source for a heater, a water heater, etc. There is a steam circulation type used, but both are scales of water supply,
The scale of iron, etc. contained in the water supply adheres to and accumulates on each part of each equipment pipe of the steam generator, which not only deteriorates heat conduction but also may block the heat absorption pipe or piping of the steam generation boiler. A large amount of scale is generated in high heat areas such as steam generating boilers, and is contained in hard water more than in soft water.

Therefore, as an example of a conventional technique, for example, a steam circulation type steam generator shown in FIG. 4 includes a steam generating boiler (103) for generating steam by heating by a heater (110) such as a gas burner, Steam generated by the steam generating boiler (103) is passed through a steam pipe (111) to a heat exchanger (10
4), the latent heat of condensation is given to cold water to heat it, and the condensate produced here is reflux-stored through a reflux pipe (112) and is opened to the atmosphere by an atmosphere opening port (113). )
And a liquid supply tank (107) in which the liquid reception tank (105) and the air intake port (114) at the upper end communicate with each other through a condensate delivery pipe (106) facing the upper space (115) of the liquid reception tank (105). ) And a lower opening (11) located in the liquid supply tank (107) of the condensate delivery pipe (106).
6) equipped with a float valve (V ₀₆ ), a liquid level sensor (117) with a low liquid level (a) and a high liquid level (b) in the liquid supply tank (107),
(118) is equipped with an on-off valve (V ₀₁ ) that opens and closes by supplying and disconnecting steam pressure by detecting with a steam generation boiler (1
The pressure equalizing pipe (108) that connects the pipe drawing part (119) of 03) and the air chamber (120) of the upper space of the liquid supply tank (107), and the check valve that blocks the reverse flow from the steam generating boiler (103). (V ₀₇ ), which consists of the lower reservoir (121) of the steam generating boiler (103) and the water supply conduit (109) that connects the lower part of the liquid supply tank (107), and has no scale cleaning function. Absent.

In the above steam generator, not only the heat conduction is deteriorated by the scale component contained in the feed water, but there is a drawback that it eventually blocks the heat absorption tube or piping,
Measures such as incorporating a water purifier to remove the scale component and separating the scale component in the feed water by the ion exchange resin, and also incorporating a gas-liquid separator to absorb the scale into the packing material Is taking.

The present invention provides a steam generator for the purpose of eliminating the above-mentioned harmful effects due to scale by automatically cleaning the inside of all the devices every cycle of operation and stop apart from such measures, that is, every time when the operation is stopped by turning off the power supply. There is.

Means for Solving the Problems The present invention relates to a steam generator including a steam generator that generates steam and a water supply device that supplies water to the steam generator, and each device pipe from the water supply device to the steam generator (A). Water supply pipe (1) equipped with a solenoid valve (V ₀ ) for supplying cleaning water to each part
And a blow pipe (2) equipped with a blow solenoid valve (V ₅ ) for discharging the cleaning water, and the solenoid valve (V ₀ ) and the blow solenoid valve (V ₅ ) are connected to the steam generator (A). When the operation is stopped, the solenoid valve (V ₀ ) is opened to supply water to each part of the steam generator (A), and after a certain period of time, the blow solenoid valve (V ₅ ) is opened to discharge the wash water. Relates to a steam generator incorporating an automatic cleaning function that is connected and connected so that it can be automatically performed at least once, and more specifically, it generates steam by heating with a heater (10) such as a gas burner. Steam generating boiler (3) and steam generating boiler (3)
Is sent to the heat exchanger through the steam pipe (11) to heat the gas or liquid by utilizing the latent heat of condensation, and the condensed liquid is reflux-stored in the return liquid pipe (12) and opened to the atmosphere A tank (5), a liquid supply tank (7) communicating with the liquid receiving tank (5) through a condensate delivery pipe (6), and a float valve (provided at the opening of the condensate delivery pipe (6) ( V ₆ ) and an on-off valve (V ₁ ) that opens and closes by detecting low level (a) and high level (b) of the liquid supply tank (7) with water level sensors (17) and (18) And a pressure equalizing pipe (8) for connecting the pipe draw part (19) of the steam generating boiler (3) and the air chamber of the upper space (20) of the liquid supply tank (7), and the reverse flow from the steam generating boiler (3). Equipped with a check valve (V ₇ ) to block the lower part (21) of the steam generating boiler (3)
And a water supply conduit (9) communicating with the lower part of the liquid supply tank (7) for supplying cleaning water from the water supply device in the steam circulation type steam generator to each device piping part of the steam generator (A) Water supply pipe (1) equipped with a solenoid valve (V ₀ ) and blow pipe (2) equipped with a blow solenoid valve (V ₅ ) for discharging the cleaning water
The solenoid valve (V ₀ ) and the blow solenoid valve (V ₅ ) are installed at the solenoid valve (V
₀ ) is opened and water is supplied to each part of each equipment pipe of the steam generator (A) through the water supply pipe (1) until it is almost full, and then the solenoid valve (V ₀ ) is closed, and thereafter, constant After a certain period of time, the blow solenoid valve (V ₅ ) is opened and each part of the equipment piping is almost filled with water. The wash water stored in the blow tube (21) is discharged at least once automatically. This is a solution to the above-mentioned problems by adopting a technical means that incorporates an automatic cleaning function which is connected and connected.

Action In the above configuration, as illustrated in the principle explanatory diagram of FIG. 3, when the operation of the steam generator (A) is stopped, the blow solenoid valve (V ₅ ) is closed, and the solenoid valve (V ₀ ), ( V ₁ ) is opened, water is supplied to the steam generator (A), water supply device (B), gas-liquid separator (23) or pipes with these to make it full of water, and the solenoid valve (V ₀ ) is closed for a while. After leaving it for a while, the solenoid valve (V ₅ ) is opened to discharge all the water supply, at which time the scale is also discharged and washed. Then, after repeating this work several times, the operation is stopped. More specifically, the steam generated by the steam generating boiler (3) is sent to the heat exchanger via the steam pipe (11), and the upper part of the liquid supply tank (7) via the pressure equalizing pipe (8). It is also sent to the air chamber of the space (20). At this time, the on-off valve (V ₁ ) provided in the pressure equalizing pipe (8) has a high liquid level (b) in the liquid supply tank (7) or between the high liquid level (b) and the low liquid level (a). When it is, it is in the open state. In the heat exchanger, the latent heat of condensation is used to heat the gas or liquid, and the condensed working liquid generated here is returned to the liquid receiving tank (5) by the return liquid pipe (12) and is received in the liquid receiving tank. Store in (5). On the other hand, since the steam pressure also acts on the air chamber of the upper space (20) of the liquid supply tank (7) through the pressure equalizing pipe (8), the steam generating boiler (3) and the liquid supply tank (7) are equalized in pressure. The float valve (V ₆ ) is kept in pressure contact with its valve seat (22) due to the pressure difference from the pressure in the liquid receiving tank (5) that is kept open to the atmosphere, and decreases with steam generation. The amount of water in the steam generating boiler (3) is automatically and sequentially replenished from the liquid supply tank (7) through the water supply conduit (9). When the liquid level in the liquid supply tank (7) reaches the low liquid level (a), the water level sensor (17) detects this and closes the on-off valve (V ₁ ) of the pressure equalizing pipe (8) to close the liquid supply tank (7). ) Stop the action of vapor pressure on the air chamber of the upper space (20). Then, the pressure in the liquid supply tank (7) decreases due to heat radiation to the outside, and when it becomes equal to the pressure in the liquid reception tank (5) plus its head pressure, the float valve (V ₆ ) of the vapor pressure Since the lifting force is released, the float valve (V ₆ ) falls and the condensate delivery pipe (6) is opened, so that the liquid receiving tank (5)
The condensate stored in the tank flows into the liquid supply tank (7) through the condensate delivery pipe (6). At this time, since the liquid receiving tank (5) is open to the atmosphere, air also flows in through the upper suction opening (14) of the condensate delivery pipe (6). When the liquid level in the liquid supply tank (7) reaches the high liquid level (b), the float valve (V ₆ ) floats by the liquid level and contacts the valve seat (22), and the water level sensor (18) When this is detected, the on-off valve (V ₁ ) of the pressure equalizing pipe (8) is opened, and the steam from the steam generating boiler (3) is made to act again on the air chamber of the upper space (20) of the liquid supply tank (7). Maintain the liquid supply tank (7) and the steam generation boiler (3) at equal pressure,
The float valve (V ₆ ) is lifted by the vapor pressure and pressed against the valve seat (22) to close the condensate delivery pipe (6) to stop the condensate from flowing into the receiving tank (7) and at the same time supply the liquid. Water is supplied from the tank (7) to the steam generating boiler (3). Thus, it is possible to continue the continuous operation while returning the condensed working liquid of the steam, that is, the condensed liquid to the steam generating boiler (3).

In the above steam circulation type steam generator, when the power is turned off to stop the operation, the solenoid valve (V ₀ ) of the water supply pipe (1) is opened to supply water to each part of each equipment pipe of the steam generator (A). The solenoid valve (V ₀ ) is closed after the water is supplied through the pipe (1) until it is almost full, and then the blow solenoid valve (V ₅ ) is connected to each part of the equipment piping for a certain period of time while the water is full. The cleaning operation of opening and discharging the scale from the blow pipe (2) together with the cleaning water with which each part of the equipment pipe is filled is automatically performed at least once or more.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the case where the present invention is applied to a steam circulation type steam generator, and FIG. 2 shows an example of the automatic cleaning flow. In the figure, (1) is for supplying cleaning water. The water supply pipe also serves as a supply pipe for circulating water, and a solenoid valve (V ₀ ) is provided on the way. (2) is a blow pipe, which is installed so that the cleaning water filled in each part of each equipment pipe of the steam generator (A) can be completely discharged by a drop, and a blow solenoid valve (V ₅ ) Is provided. The solenoid valve (V ₀ ) and the blow solenoid valve (V ₅ ) are turned off and the operation of the steam generator (A) is stopped, so that the solenoid valve (V ₀ ) is opened and the steam generator (A) is opened. ), Water for cleaning is supplied to each part of each equipment pipe, and after a preset amount of water (a substantially full state) is supplied to each part of each equipment pipe, the solenoid valve (V ₀ ) is closed, and then each Allow the blow solenoid valve (V ₅ ) to open after a certain period of time until the scale of each part of the equipment piping is diluted and absorbed in water, and discharge the washing water filled in each part of the equipment piping from the blow tube (2). At least 1 cleaning action
It is connected via a control box etc. so that it can be automatically performed more than once. Further, (3) is a steam generating boiler of the steam generator (A), which is provided with an end portion (upper header) (19) and a lower reservoir (lower header) (21) for absorbing heat (3a). Without a through-flow boiler that communicates with a large number of heat absorption tubes (3b), covers the outer surface with a heat insulating material (3c), and heats the heat absorption tubes (3b) with a heater (10) such as a gas burner to generate steam. ing. (3d) is a vacuum breaker provided in the pipe draw part (19) of the steam generating boiler (3), and when the set pressure is equal to or lower than the atmospheric pressure, the atmosphere is sucked and the inside of the steam generating boiler (3) becomes negative pressure. To prevent excessive water supply. (11) is a steam pipe connected to the steam extraction pipe (19a) from the pipe draw part (19) of the steam generation boiler (3) via a gas-liquid separator (23), and is connected to a heat exchanger (not shown). The steam generated in the connected steam generating boiler (3) is sent to the heat exchanger to give the latent heat of condensation of the steam to the gas or liquid flowing through the heat exchanger, for example, for boiling water. A liquid receiving tank (5) is connected to the heat exchanger through the return liquid pipe (12), and the condensate produced in the heat exchanger passes through the return liquid pipe (12) and the liquid receiving tank (5). The lower end of the liquid receiving tank (5) is communicated with the drain opening (25) of the drain plug (V ₈ ) provided in the discharge pipe (24) of the liquid receiving tank (5). Atmosphere open pipe (13)
The upper end of the liquid receiving tank (5) is opened above the upper water level (c) to open the inside of the liquid receiving tank (5) to the atmosphere, and the atmosphere open pipe (13)
It also serves as an overflow pipe. (26) is a water level sensor for detecting the upper water level (c) of the liquid receiving tank (5), which is electrically connected to the solenoid valve (V ₀ ) of the water supply pipe (1) and is associated with the steam generator ( When the water level of the liquid receiving tank (5) at the highest position in (A) reaches the clean water level (c), flush water is supplied to each part of each equipment pipe to fill the clean water level (c).
When the water level sensor (26) detects, the solenoid valve (V ₀ ) is closed and the water supply is stopped. (27) is a water level sensor for detecting the lower water level (d) of the liquid receiving tank (5). When the water level sensor (27) detects a decrease in the circulating fluid amount during operation, the solenoid valve (V ₀ ) opens to supply the insufficient water. (6) is a condensate delivery pipe vertically provided at the lower part of the liquid receiving tank (5), and the upper end thereof is the liquid receiving tank (5)
(6a) and the lower end opens (6b) to the liquid supply tank (7) described below.
The liquid receiving tank (5) and the liquid supplying tank (7) are communicated with each other through the condensate delivery pipe (6). (V ₆ ) is a float valve installed near the lower opening (6b) of the condensate delivery pipe (6), which moves up and down depending on the liquid level and internal pressure in a liquid supply tank (7) to be described later, and its valve seat The condensate delivery pipe (6) is opened and closed by contacting and separating from (22) to supply and disconnect the condensate from the liquid receiving tank (5) to the liquid supplying tank (7). (7) is a liquid supply tank, which is provided at one lower side of the liquid receiving tank (5) and has a water level sensor (17) for detecting a low liquid level (a) and a high liquid level in the liquid supply tank (7). A water level sensor (18) for detecting the position (b) is provided, and the air chamber of the upper space (20) of the water level sensor (18) and the pipe pulling part (19) of the steam generating boiler (3) are steamed from the pipe pulling part (19). Extraction pipe (19
It is connected by a pressure equalizing pipe (8) which is connected and communicated with a) through a gas-liquid separator (23), and the pressure equalizing pipe (8) is electrically connected to the water level sensors (17), (18). An on-off valve, for example, a solenoid valve (V ₁ ) is provided. Further, the air chamber of the upper space (20) of the liquid supply tank (7) and the upper space (15) of the liquid receiving tank (5) are connected and communicated with each other by an air suction pipe (14) to the air suction pipe (14). Is a low liquid whose liquid level in the liquid supply tank (7) is predetermined by providing an opening / closing valve electrically connected to the water level sensors (17) and (18), for example, a solenoid valve (V ₂ ). When it reaches the position (a), the water level sensor (17) detects it and the detection signal closes the solenoid valve (V ₁ ) of the pressure equalizing pipe (8) and at the same time the solenoid valve (V ₂ ) of the air suction pipe (14). Is opened, and when the liquid level in the liquid supply tank (7) reaches a predetermined high liquid level (b), the water level sensor (18) detects this, and the detection signal detects the electromagnetic valve (8) of the pressure equalizing pipe (8). V ₁ ) is opened and the solenoid valve (V ₂ ) of the air suction pipe (14) is closed. Furthermore, a wave plate having a drain dropping hole (28) provided in the upper space (15) of the liquid receiving tank (5) with the upper ends of the air suction pipe (14) and the return liquid pipe (12) from the heat exchanger ( 29), and the upper end of the atmosphere open pipe (13) faces the lower part of the wave plate (29) so that the air intake pipe (14), the return liquid pipe (12) and the atmosphere open pipe (13) Does not communicate directly. (9) is a water supply conduit that connects the lower reservoir (21) of the steam generating boiler (3) and the lower part of the liquid supply tank (7) to the water supply conduit (9). A check valve (V ₇ ) for preventing backflow and a water supply solenoid valve (V ₄ ) are provided, and the amount of water in the steam generating boiler (3) that decreases with steam generation is supplied through the water supply conduit (9) to a liquid supply tank. It is automatically replenished from (7).

The blow pipe (2) is taken out from the bottom portion of the gas-liquid separator (23) and communicates with the water supply conduit (9) by crossing the blow pipe (2). An empty heating prevention sensor (30) is provided in the middle of the blow pipe (2). And a washing conduit (31) opened at the bottom of the liquid receiving tank (5) is connected to the dry heating prevention sensor (30) so that the liquid receiving tank (5) and the blow pipe (2) communicate with each other. A solenoid valve (V ₃ ) for cleaning is provided in the conduit (31). Further, an exhaust temperature detection sensor (33) is provided in the exhaust passage (32) from the steam generating boiler (3), and is provided in the gas supply passage (34) to the heater (10) together with the empty heating prevention sensor (30). A steam generating boiler (3) is provided when one of the dry heating prevention sensor (30) and the exhaust gas temperature detection sensor (33) reaches or exceeds a set limit value by being electrically connected to the provided electromagnetic safety valve (V ₉ ). )
Combustion of the heater (10) is automatically stopped for safety. Further, in the embodiment, as the heater (10) of the steam generating boiler (3), a forced air supply type ceramic burner equipped with a rectifying plate (35) is used, and at the air outlet (36) of the air supply fan (F). The gas nozzle (37) connected to the gas supply path (34) is faced, and the air from the air supply fan (F) and the gas from the nozzle (37) are mixed at the air outlet (36) and sent to the burner. It is getting done. In the figure, (V
₁₀ ) is a main steam valve provided in the steam pipe (11), and (V ₁₁ ) is a water drain plug provided in the water supply pipe (1).

Each solenoid valve (V ₁ ) ... (V ₁₁ ) in the above configuration is
It is connected so as to automatically control opening and closing according to a predetermined program in response to a command from the control box according to cleaning or other purposes.

Next, the operation of the above embodiment will be described.

When the liquid level of the liquid supply tank (7) is between the high liquid level (b) or between the high liquid level (b) and the low liquid level (a), the solenoid valve (V ₁ ) of the pressure equalizing pipe (8) is Since the solenoid valve (V ₂ ) of the air intake pipe (14) is in the open state, the steam generated from the steam generating boiler (3) by heating the endothermic pipe (3b) by the heater (10) Is pressure-fed from the steam extraction pipe (19a) through the vapor-liquid separator (23) to the heat exchanger from the steam pipe (11), and also from the pressure equalizing pipe (8) to the upper space (20) of the liquid supply tank (7). ) Also acts on the air chamber at the same time. Then, in the heat exchanger, the latent heat of vapor condensation is applied to the gas or fluid flowing through the heat exchanger, for example, boiling is performed, and the condensate of the vapor generated by heat dissipation is returned to the return pipe (12). It is refluxed to the liquid receiving tank (5) and stored in the liquid receiving tank (5). On the other hand, the vapor pressure also acts on the air chamber of the upper space (20) of the liquid supply tank (7) to keep the liquid supply tank (7) and the steam generating boiler (3) at a uniform pressure, and this pressure releases the atmosphere. A pressure difference occurs between the pressure of the liquid receiving tank (5) open to the atmosphere through the pipe (13) and the liquid supplying tank (7), and the float valve (V ₆ ) is brought into pressure contact with its valve seat (22). , The water amount (water level) of the steam generating boiler (3) that decreases (decreases) with the steam generation under the condition that the condensate delivery pipe (6) is closed from the liquid supply tank (7) to the water supply conduit (9) It is automatically replenished in sequence through the and constantly maintained at a constant amount (constant water level).
The liquid level of the liquid supply tank (7) gradually decreases with the continuous operation of the steam generating boiler (3), and when the liquid level reaches a predetermined low liquid level (a), a water level sensor ( 17)
Detects this, and the detection signal closes the solenoid valve (V ₁ ) of the pressure equalizing pipe (8) and opens the solenoid valve (V ₂ ) of the air suction pipe (14). Thus, the action of vapor pressure on the air chamber of the upper space (20) of the liquid supply tank (7) is stopped, and the air chamber of the upper space (20) of the liquid supply tank (7) and the liquid receiving tank ( Upper space of 5) (15)
Is communicated with the air suction pipe (14), the pressure in the liquid supply tank (7) gradually decreases due to heat radiation to the outside and becomes equal to the pressure in the liquid reception tank (5) plus its head pressure. At this point, the lifting force due to the pressure of the float valve (V ₆ ) is released, and the float valve (V ₆ ) falls by its own weight and the valve seat (22)
The condensate which is stored in the liquid receiving tank (5) is communicated with the condensate delivery pipe (6) by opening the condensate delivery pipe (6) apart from the upper opening (6a) of the condensate delivery pipe (6) → valve seat (22) → lower part It is made to flow into the liquid supply tank (7) through the opening (6b). At this time, since the liquid receiving tank (5) is opened to the atmosphere by the atmosphere opening pipe (13), air also flows in together. In this way, when the stored condensate in the liquid receiving tank (5) flows into the liquid supplying tank (7) and the liquid level reaches a predetermined high liquid level (b), the float valve (V ₆ ) floats according to the liquid level and is in contact with the valve seat (22), and the water level sensor (18) provided at this position detects this, and the detection signal detects the electromagnetic valve (V ₁ of the pressure equalizing pipe (8). ) Is opened and the solenoid valve (V ₂ ) of the air suction pipe (14) is closed, and the liquid supply tank (7)
The steam pressure from the steam generating boiler (3) is caused to act again on the air chamber of the upper space (20) of the liquid supply tank (7) and the steam generating boiler (3) to maintain a uniform pressure, and the float valve ( V ₆ ) is brought into pressure contact with the valve seat (22) to close the condensate delivery pipe (6) to stop the inflow of the condensate from the receiving tank (5) and at the same time to generate steam from the liquid supply tank (7). (3)
The automatic water supply to the steam generating boiler (3) is started to keep the water amount constant.

The above-mentioned series of steam circulation operation allows the working fluid in which steam is condensed to be returned to the steam generating boiler by itself, and continuous operation can be continued.However, if the power is turned off to stop the operation of the steam generator, the control is performed. It is a command from the box to automatically clean all parts of each equipment pipe, but an example of the automatic cleaning is explained according to the flow in Fig. 2. When the power of the steam generator is turned off, the control box Command, and wait for 30 minutes after turning off the power, considering the possibility of restarting. Therefore, during this 30 minutes, if the power is turned on, the operation can be restarted immediately and the can body temperature is lowered to some extent. Therefore, 30 minutes after the power is turned off, the solenoid valves (V ₀ ), (V ₁ ), (V ₂ ), (V ₃ ) excluding the blow solenoid valve (V ₅ ) are commanded by the control box. When it is opened and each part of the equipment pipe is communicated with each other, water for cleaning is supplied from the water supply pipe (1) to each part of the equipment pipe until the water level in the liquid receiving tank (5) reaches the upper level (c). ) Has been reached and the water level sensor (26) detects this and informs the control box,
Stop the water supply by closing the solenoid valve (V ₀ ) of the water supply pipe (1). After that, it is left for a certain period of time, that is, for 5 seconds, and during the 5 seconds, scales such as scale that adheres to and accumulates on each part of each equipment pipe become together with the full-flushed cleaning water, and after that, the certain time elapses. The blow solenoid valve (V ₅ ) of the blow pipe (2) is opened according to a command from the control box, and the scale water filled in each part of each equipment pipe is filled with the cleaning water from the blow pipe (2). It is discharged to the outside. Since this discharge is carried out at the head, it is discharged vigorously at first, but the momentum gradually weakens, and finally it becomes a state of chilling. The scale becomes thicker in the state of the chilly chiller in the latter half of the drainage than the initial drainage. Therefore, by performing the drainage operation for 300 seconds and continuing the latter half of the drainage for a while, it is possible to completely drain to the dark scale. Then, the cleaning solenoid valve (V ₃ ) and blow solenoid valve (V ₅ ) are closed by a command from the control box, and one cleaning operation is completed, but this cleaning operation is performed automatically at least once ( 2 times in the flow of Fig. 2) When the set number of washing operations are completed, the control box closes the solenoid valves (V ₁ ) and (V ₂ ) to prepare for the next operation and complete the washing. To do.

EFFECTS OF THE INVENTION As described above, according to the present invention, in the steam generator, each time when the operation is stopped by turning off the power, each device piping part is automatically cleaned. The adhesion of scale such as iron, deterioration of heat conduction due to accumulation and blockage of the heat absorption pipe or piping of the steam generating boiler are eliminated, and only the cleaning function is incorporated in the steam generator, or the water purifier or gas liquid By combining with a separator, the scale removal process is surely performed, and an excellent effect that has never been obtained is exhibited.

In addition, since the water can be completely discharged from each part of each equipment pipe by the washing operation, it is safe as well as preventing freezing in cold regions.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a steam generator according to the present invention, FIG. 2 is a flow chart showing an example of an automatic cleaning flow thereof, FIG. 3 is an explanatory view of the principle of the present invention, and FIG.
FIG. 1 is a schematic configuration diagram of a steam circulation type steam generator. (A) ... Steam generator, (1) ... Water supply pipe, (V ₀ ) ... Solenoid valve, (2) ... Blow pipe, (V ₅ ) ... Blow solenoid valve, (3)
... steam generating boilers, (4) ... heat exchanger, (5) ... receiver tank, (V ₆₎ ... float valve, (6) ... condensate delivery tube,
(7) ... Liquid supply tank, (V ₁ ) ... Open / close valve, (8) ... Pressure equalizing pipe,
(V ₇ ) ... Check valve, (9) ... Water supply conduit.

Claims (2)

[Claims] 1. A steam generator comprising a steam generator for generating steam and a water supply device for supplying water to the steam generator, wherein washing water is supplied from the water supply device to each part of each equipment pipe of the steam generator (A). Water pipe (1) with solenoid valve (V ₀ ) for
And a blow pipe (2) equipped with a blow solenoid valve (V ₅ ) for discharging the cleaning water, and the solenoid valve (V ₀ ) and the blow solenoid valve (V ₅ ) are connected to the steam generator (A). When the operation is stopped, the solenoid valve (V ₀ ) is opened to supply water to each part of the steam generator (A), and after a certain period of time, the blow solenoid valve (V ₅ ) is opened to discharge the wash water. A steam generator that incorporates an automatic cleaning function that is connected and linked so that it can be automatically performed at least once. 2. A steam generating boiler for generating steam (3)
And a liquid receiving tank (5) in which the condensate that produces the vapor by a heat exchanger is stored under reflux and opened to the atmosphere, and a condensate having the liquid receiving tank (5) and a float valve (V ₆ ). A liquid supply tank (7) communicating with the delivery pipe (6) and an opening / closing valve (V ₁ ) that opens and closes according to the water level detection of the liquid supply tank (7) and an upper part of the steam generating boiler (3) A pressure equalizing pipe (8) communicating with the upper part of the liquid supply tank (7) and a check valve (V ₇ ) for preventing backflow from the steam generating boiler (3) are provided and the lower part of the steam generating boiler (3) and the liquid supply. The steam generator according to claim 1, which is a steam generator (A) including a water supply conduit (9) communicating with a lower portion of the tank (7).