JPS6284230A - Single pipe steam conveying device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] - Industrial Field of Application The present invention utilizes a single steam pipe to guide heat medium vapor generated in a steam generator to a heat radiation tube in a heat radiation section, and to conduct heat transfer with this heat radiation tube. A single pipe that gives latent heat to the surrounding fluid, temporarily stores the condensed liquid in a condensate reservoir, and returns it to the steam generator by the decompression effect generated by stopping heating, and transports thermal energy by repeating this process. The present invention relates to a type steam conveying device.

・Prior art and its problems Figure 1 shows a conventional single-tube steam conveying device, where numeral 1 is a steam generator, inside of which a heat transfer liquid 2 is sealed, and 6 and 7 are steam generators. Each of heat transfer liquid 2! A high liquid level sensor and a low liquid level sensor installed within the steam generator l to detect IY. 3 is a burner, and 4 is a fuel valve provided in the middle of the fuel supply pipe 5. Reference numeral 20 denotes a heat dissipation section, in which a heat dissipation tube 9 is incorporated. 1
2 is a condensate reservoir, and the upper part thereof has a communication port 13 with the atmosphere.
is standing. 10 is a condensate pipe connecting the outlet of the heat dissipation tube 9 and the bottom of the condensate reservoir 12. 8 is the steam generator l
This is a steam pipe that connects the top of the tube and the inlet of the heat radiation tube 9.

22 is an inner shell provided so that combustion gas flows around the steam generator l; 23 is a flue; and 24 is a combustion fan attached to the flue, which is driven by a motor 25. 21 is a control device.

In this conventional example, when the operation switch is turned on, the motor 25
is energized, the combustion fan 24 sends air into the burner 3, the fuel valve 4 opens and combustion starts, and the heat transfer liquid 2 in the steam generator 1 is heated.

When the pressure inside the steam generator l becomes equal to or higher than atmospheric pressure, the heat medium vapor passes through the steam pipe 8 to the heat radiation tube 9 in the heat radiation part 20.
The heat medium vapor imparts latent heat to the surrounding fluid of the heat dissipation tube 9 and is condensed, and the condensed liquid is discharged from the condensed liquid pipe IO to the condensed liquid reservoir 12. The pressure applied to the surface of the condensate in the TM condensate'RB12 is always maintained at atmospheric pressure by the atmosphere a vent 13.

When the amount of heat transfer liquid 2 in the steam generator 1 falls below the level of the low liquid level sensor 7, the fuel valve 4 closes to stop heating the steam generator 1, and the air sent by the combustion fan 24 generates steam. The generator 1 is forced to cool down and a vacuum is created.

Due to this pressure reduction action, the condensate accumulated in the condensate reservoir 12 is moved to the condensate pipe lO1, the heat dissipation tube 9,
The heat medium is returned to the steam generator l through the steam pipe 8, and when the heat medium liquid amount 2 reaches or exceeds the position of the high liquid level sensor 6, the fuel valve 4 is opened to resume heating and send out the steam again. In other words, the steam was conveyed to the heat dissipation section.

In the above conventional example, the temperature of the heat medium inside the steam generator l is cooled while maintaining equilibrium with the steam generator body, so the steam generator body, the heat medium liquid left in the steam generator, and the surroundings of the steam generator are covered. Reflux into the steam generator does not begin until the inner shell falls below the saturation temperature at atmospheric pressure, and it takes a long time to complete the reflux, and thermal energy must be released to lower the temperature to the saturation temperature. There was a problem that it had to be done.

-Object of the present invention The purpose of the present invention is to propose a single-tube steam conveying device that allows condensate to flow back into the steam generator in an extremely short period of time when heating of the steam generator is stopped.

Structure of the present invention In order to achieve the above object, the present invention provides a single-tube steam conveying device, which includes a steam generator having a heating source, a heat radiating section incorporating a heat radiating tube inside the steam generator, A steam pipe that guides the steam generated in the heat radiation section to the heat radiation section, a reflux pipe branched from a part of the steam pipe leading to the heat radiation tube, and a reflux pipe that branches off from a part of the steam pipe leading to the heat radiation tube; A thermal valve that opens the reflux pipe side when the medium temperature is below a predetermined temperature and closes the reflux pipe side when the temperature is higher than the predetermined temperature; An open liquid pipe, a condensate pipe connecting the outlet of the heat radiation tube and the liquid pipe, and a condensate pipe to prevent the condensed heat medium from flowing back toward the heat radiation tube side. A configuration consisting of a check valve attached to the

When the device described above is turned on, the fuel valve opens and the heat medium liquid in the steam generator is heated, and the heat medium vapor is sent through the steam pipe to the heat radiation tube in the heat radiation section. The thermal valve installed at the inlet of the heat dissipation tube closes when it comes into contact with fluid above the set temperature, and opens when the temperature is below the set temperature, so when heat medium vapor reaches the heat dissipation section, the thermal valve closes. is closed, and the heat medium vapor is led to the heat dissipation tube, imparting latent heat to the surrounding fluid and condensing it. The condensed heat transfer liquid is discharged into a condensate reservoir from a condensate pipe connected to an outlet of the heat radiation tube.

A check valve installed in the middle of the reflux pipe is used to control the time until the thermal valve closes when the heat medium flows, and the steam flow generated by the leakage of the thermal valve to flow out into the condensate reservoir through the reflux pipe. prevent

When the amount of heat transfer liquid in the steam generator decreases to a predetermined amount,
Fuel valve closes. At this time, the pressure inside the heat radiation tube decreases rapidly, and the check valve installed in the middle of the condensate tube closes, cutting off communication with the atmosphere. Thermal valves have a passing fluid temperature of 8
The steam generator and heat dissipation tube, which work to maintain a closed state until the temperature drops to about 5℃, are cut off from communication with the atmosphere.Sixth, each has a saturated vapor pressure based on its temperature. Due to this saturated vapor pressure difference, the steam in the steam generator flows into the heat dissipation tube, and the temperature of the heat medium in the steam generator drops rapidly, so the pressure also drops sharply, so the temperature of the heat medium vapor passing through the thermal valve decreases. The thermal valve opens when the temperature reaches approximately 85℃.
The condensate stored in the condensate reservoir is returned to the steam generator under the influence of atmospheric pressure through the reflux pipe and the steam pipe. After the heating medium liquid returns to the steam generator, the fuel valve is opened to heat the heating medium and send the steam to the heat radiation section again. As described above, the present invention provides a single pipe intermittent steam conveying device that does not use a pump.
Minimizes reflux time and thermal energy loss during reflux,
This has the effect of improving operating efficiency.

・Embodiment FIG. 2 shows an embodiment of the present invention, in which reference numeral 1 denotes a steam generator whose interior is sealed, in which a heat transfer liquid 2 is sealed; 6. 7 are respectively heat transfer liquids 2
A high liquid level sensor and a low liquid level sensor are attached to the steam generator 1 to detect the amount of water.

3 is a burner, and 4 is a fuel valve provided in the middle of the fuel supply pipe 5.

Reference numeral 20 denotes a heat dissipation section, in which a heat dissipation tube 9 is incorporated. 8 is a steam pipe connecting the top of the steam generator 1 and the heat radiation section. A thermal valve 16 is attached to the inlet of the heat radiation tube 9. Reference numeral 15 denotes a reflux pipe branching from the thermal valve 16, and a check valve 17 is attached to a part of the reflux pipe 15. Reference numeral 18'a denotes a temperature-sensing part of the thermal valve, and a valve stem tab is attached to the tip of the temperature-sensing part, so that the valve stopper at the tip of the valve stem and the valve seat 19 are in close contact with each other to close the valve.

The outlet of the heat dissipation tube 9 is connected to the condensate pipe 10,
A check valve 11 is attached to a part of the condensate pipe 10. Reference numeral 14 denotes a liquid pipe, one end of which opens at the bottom of the condensate reservoir 12, and the other end connected to the ends of the condensate pipe IO and the reflux pipe 15. Reference numeral 13 denotes a communication port with the atmosphere provided at the upper part of the condensate reservoir 12. 22 is an inner shell provided so that combustion gas flows around the steam generator l, 23 is a flue, and 24 is a combustion fan attached to the flue, which is driven by a motor 25. 21 is a control device.

The embodiment has the above configuration, and an example of its operation will be explained next.

When operating the device for the first time after installation, the steam generator 1.
Steam pipe8. Heat dissipation tube 9, condensate pipe 1O1 reflux pipe 15
, prepare a heat medium liquid in an amount equal to the total volume of the liquid pipes 14 plus the volume that takes into account the evaporation loss from the opening 13 of the condensate reservoir 12 to the atmosphere, and add this heat medium liquid to the steam generator l. Liquid level sensor 6
Pour the remaining liquid into the condensate reservoir 12, J! l! When the switch is turned on, the fuel valve 4
opens, the burner 3 starts combustion, and heats the heat transfer liquid 2 in the steam generator 1. When the heat transfer liquid 2 reaches the saturation temperature at atmospheric pressure, steam is generated and flows through the upper space in the steam generator 1 and the steam pipe 8. Heat dissipation tube 9, condensate pipe 10, liquid pipe 1
The air in the chamber 4 is discharged into the atmosphere through the opening 13 as steam.

When the level of the heat medium liquid 2 in the steam generator 1 decreases to below the low liquid level sensor 7, the fuel valve 4 closes and the pressure inside the steam generator 1 is reduced, and the heat medium liquid accumulated in the condensed liquid reservoir 12 is removed. 2 is the steam generator l
, steam pipe 8, heat dissipation tube 9. Condensate pipe 101
The M flow pipe 15 and the liquid pipe 14 are filled with the heat transfer liquid 2, and the condensate reservoir 12 contains a small amount of liquid with the end opening of the liquid pipe 14 inserted into the condensate liquid 2a (heat transfer liquid 2). During normal operation, when the operation switch is turned on, the combustion fan 24 rotates to feed air into the burner 3, and then the fuel valve 4 opens to heat the heat transfer liquid 2 in the steam generator 1. When the temperature of the heat transfer liquid 2 reaches the saturation temperature under atmospheric pressure, steam starts to be generated, and the heat transfer liquid 2 in the steam pipe 8 and the heat radiation tube 9 is expelled to the condensed liquid reservoir 12, and the steam flows into the heat radiation tube 9. reach. While passing through the heat dissipation tube 9, the steam imparts latent heat to the surrounding fluid and condenses. At the latter stage of the heat dissipation tube 9, the condensate 2
A significant portion of the heat is transferred to the surrounding fluid, resulting in a temperature drop.

The outlet of the heat dissipation tube 9 is connected to a condensate pipe 10 with a check valve 11 interposed in the middle, and the reflux pipe 15, which discharges the condensate 2at into the condensate reservoir 12, has a thermal valve 16 The check valve 17 prevents steam from flowing, and the pressure applied to the surface of the condensate 2a in the condensate reservoir 12 is always maintained at atmospheric pressure by the opening 13.

When the heat medium liquid 2 in the steam generator 1 decreases to the position of the low liquid level sensor 7, the fuel valve 4 closes and the heating of the heat medium liquid 2 is interrupted. At this time, the pressure inside the heat dissipation tube 9 built into the heat dissipation section 20 decreases rapidly, and the check valve 11 closes to cut off communication with the atmosphere.The thermal valve 16 attached to the inlet of the heat dissipation tube 9 passes through. When the fluid temperature drops to, for example, 85°C or lower, the steam pipe 8 is routed from the condensate reservoir 12 via the reflux pipe 15.
It is set to open a flow path in the direction.

Since the steam generator l and the heat radiation tube 9 are completely cut off from communication with the atmosphere, they have saturated vapor pressures at each temperature. The steam flows out towards the steam generator 1, and the heating medium in the steam generator 1 is rapidly cooled, and therefore the pressure is rapidly reduced. When the heat medium vapor temperature drops to 85°C, the temperature sensing part 18a contracts and opens the valve, and the condensate 2a flows into the condensate reservoir 1 under the action of atmospheric pressure.
2 through the reflux pipe 15 and the steam pipe 8 to the steam generator 1, and when the amount of the heat transfer liquid 2 in the steam generator 1 returns to the high level sensor position 6, the fuel valve 4 is opened. Then, heating of the heat transfer liquid 2 is restarted. Even if heating is restarted when the amount of reflux into the steam generator 1 is between 1/3 and 172, the refluxing heat medium liquid 2
Due to the low temperature of the steam generator 1, the vacuum state of the steam generator 1 is maintained, and there is no obstacle to the reflux of the entire amount of the delivered heat transfer medium.

Figure 3 shows the data obtained during operation of the example, and the horizontal axis shows the elapsed time after turning on the operation switch, and the exhaust gas temperature,
It shows changes in the temperature inside the steam generator, the pressure inside the steam generator, and the cumulative amount of heat medium delivered. Water is used as the heat medium, output 25
This is an example of a heating machine in which a 00 kcal steam generator and a heat dissipation window are connected by a single pipe with an inner diameter of 7 m and a length of 10 m. Two minutes and 45 seconds after turning on the operation switch, the heat medium temperature in the steam generator l reaches 100°C, and after discharging the heat medium liquid 2 in the steam pipe 8 and heat radiation tube 9, steam is stably sent out for 10 minutes. do.

The reason why the temperature and pressure inside the steam generator 1 are slightly high at the beginning of steam generation is due to the discharge of the heat medium liquid 2, and the reason why the slope of the cumulative heat medium delivery amount is steep is when the heat medium liquid 2 changes to steam. This is because it rapidly expands and expels the surrounding heat transfer liquid 2 from the steam generator 1. Ten minutes after the start of steam delivery, the fuel valve 4 closes, and immediately after that, the check valve 11 closes. Due to the difference in heat medium temperature between the steam generator 1 and the heat radiation tube 9, steam is still sent from the steam generator 1 to the heat radiation tube 9, so the pressure and temperature inside the steam generator 1 rapidly decrease, causing the thermal valve to Thermal valve 16 opens when the temperature of the heat medium vapor passing through 16 drops to about 85°C.

Since the heat medium in the steam generator can be considered to be in a saturated state, the pressure is reduced to approximately 0.6 kg/cm (ab) at this time. The a-ray source 2a stored in the condensate reservoir 12, whose liquid surface is exposed to atmospheric pressure, passes through the liquid pipe 14, the reflux pipe 15, and the steam pipe 8 to the 3
The entire amount of the heat medium sent out in 0 seconds finishes returning to the steam generator 1. Although the exhaust gas temperature continues to fall during this period,
The steam generator such as the inner shell 22
This indicates that the ambient temperature is considerably higher than 100°C.

When the amount of heat transfer liquid 2 in the steam generator 1 has recovered to the position of the high liquid level sensor 6, the fuel valve 4 opens and heating resumes.

The combustion stop time is about 30 seconds. The temperature of the refluxed heat medium liquid is approximately 60°C, and the heating time required to send out the steam again is 1 minute and 30 seconds. Therefore, the interruption time for steam delivery is approximately 2 minutes.
It's a minute.

FIG. 4 shows data during operation of the conventional example.

After the combustion is stopped, the heat transfer liquid 2 in the steam generator 1 is exposed to the atmosphere through the condensate pipe 10 at the end of the heat dissipation tube 9, so although the temperature rapidly drops to 100°C, the inner shell 2
2 etc. Since the steam generator is cooled in equilibrium with the surrounding temperature, the exhaust gas temperature is maintained at 100°C for about 1 minute and 30 seconds until it drops below 100°C.
At this point, the pressure inside the steam generator 1, which is in a saturated state, is finally reduced and reflux begins.

'i; It took 2 minutes and 30 seconds to finish the first class,
The steam delivery interruption time is 4 minutes.

Comparing with the operational data of the second embodiment of the present invention shown in Fig. 2, when the single-tube steam conveying device according to the present invention is 1 mm, the reflux time is reduced from 150 seconds to 50 seconds compared to the conventional example. 173, the steam delivery interruption time was increased from 4 minutes to 2 minutes 172
In addition, the combustion interruption time was increased from 130 seconds to 30 seconds by l/4.
It can be seen that it has been significantly shortened.

According to the present invention, the pressure inside the steam generator 1 is reduced by the inner shell 22.
This is not generated while maintaining temperature equilibrium with the surroundings of the steam generator l, but is generated due to the outflow of steam into the heat radiation tube 9. Therefore, even if the combustion fan 24 is stopped during the reflux time, the reflux time Since this has almost no effect, the operation of the combustion fan 24 may be linked to the opening and closing of the fuel valve 4.

As the thermal valve 16, a bellows valve, a wax valve, a bimetallic valve, etc. can be used.

- Effects of the present invention The structure and operation of the present invention are as described above, and the following effects can be obtained.

a. When combustion is stopped, the communication between the steam generator and the heat dissipation tube is cut off for a certain period of time, and the rapid decompression effect caused by the steam flowing out from the steam generator toward the heat dissipation tube is applied to the condensate. Since it is used for reflux, the reflux time can be significantly shortened.

b. Since the combustion stop time is shortened, the energy loss during reflux becomes extremely small, and the operating rate can also be improved.

Since the steam transfer device does not use a C6 pump and only operates by opening and closing valves, an inexpensive steam medium heat utilization system can be constructed.

d. Since the steam generator and the heat radiating section convey the heat medium through a single steam pipe, workability is greatly improved.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a single-pipe steam conveying device according to the present invention, FIG. 2 is an explanatory diagram of a conventional single-pipe steam conveying device, and FIG. 3 is an operational data diagram of the device according to an embodiment of the present invention. , FIG. 4 is an operational data diagram of a conventional example. ■...Steam generator, 3...Burner, 8...Steam pipe, 9...Radiation tube, lO...Condensate Tube, 11...
non-return valve. 12... Condensate reservoir, 13... Communication port, 14... Liquid pipe, 15...
Volume flow pipe, 16... thermal valve, 21...
...Control device, 22...Inner shell, 23.
... Flue, 24 ... Combustion fan, 25.
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Claims (1)

[Scope of Claims] 1. A steam generator having a heating source; a heat radiating section incorporating a heat radiating tube therein; a steam pipe guiding steam generated in the steam generator to the heat radiating section; and the heat radiating section. A reflux pipe branches off from a part of the steam pipe leading to the tube, and at the branch point between this steam pipe and the reflux pipe, the reflux pipe side is opened when the temperature of the heat medium in the steam pipe falls below a predetermined temperature. , a thermal valve that closes the reflux pipe side when the temperature is higher than a predetermined temperature; a liquid pipe connected to the reflux pipe and having an outlet opening into the vapor reservoir; and an outlet of the heat radiation tube and the liquid pipe. A single-pipe steam transfer device comprising: a condensate pipe that connects the condensate pipe; and a check valve installed in the condensate pipe to prevent the condensed heat medium from flowing back toward the heat radiation tube side. 2. The single-pipe steam transfer device according to claim 1, wherein a check valve is attached to a part of the reflux pipe to stop the flow of steam and release the flow of the condensed heating medium.