JP3785215B2 - Steam heating device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for heating an object to be heated in a heat exchanger with steam, and more particularly to a steam heating apparatus suitable for heating at a relatively low temperature of about 100 ° C.
[0002]
[Prior art]
As a conventional steam heating device, for example, a device as disclosed in JP-A-7-328423 has been used. This is a nozzle connected to the steam supply pipe on the inlet side of the heating section and a suction chamber formed around the nozzle, connecting the suction chamber and the heating section, and interposing a valve means on the outlet side of the nozzle. The object to be heated can be heated by steam at a relatively low temperature of about 100 ° C.
[0003]
[Problems to be solved by the invention]
The conventional apparatus has a problem that the condensed water as the condensed water generated in the heating section of the heat exchanger cannot be reliably sucked, and the condensed water stays in the heating section. When the steam pressure used in the heating unit is low and there is almost no difference from the atmospheric pressure, or when it is not possible to provide a falling part between the heating unit and the condensate recovery device, it occurred in the heating unit Condensate cannot naturally flow down to the condensate recovery device and stays in the heating section.
[0004]
If the condensate stays in the heating section, the heat capacity of the condensate is smaller than that of the steam.As a result, when the object to be heated is deprived of heat, the temperature immediately drops, causing temperature unevenness and uniforming the object to be heated. It becomes impossible to heat it.
[0005]
Therefore, the technical problem of the present invention is to obtain a steam heating device that can reliably suck the condensate generated in the heating section of the heat exchanger and does not retain the condensate.
[0006]
[Means for Solving the Problems]
The technical means of the present invention taken to solve the above technical problem is to form a heating section in a heat exchanger and connect a heating steam supply pipe and discharge condensate generated by heating. connect the condensate recovery system, to the inlet side of the heating section by arranging the nozzles in communication with the steam supply pipe connected to the heating unit to an outlet side of the nozzle, the forming a suction chamber covering the periphery of the nozzle In the case where the suction chamber is connected to the condensate recovery device , the outlet side of the nozzle and the heating unit are connected via a pipe, the pipe is branched, an atmosphere communication pipe and an open / close valve are attached, and the atmosphere communication is provided. Residual air in the heating unit and condensate recovery device is excluded from the pipe and the on-off valve .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
By supplying the steam to the nozzle, the steam is supplied from the outlet side to the heating unit, and at the same time, a suction force is generated in the suction chamber around the nozzle, and the condensate recovery apparatus is sucked to recover the condensate recovery apparatus. The inside is in a vacuum state below atmospheric pressure. By setting the inside of the condensate recovery device in a vacuum state, when the steam pressure in the heating section of the heat exchanger is low and there is almost no difference from the atmospheric pressure, or when it is below atmospheric pressure, or the heating section and the condensate recovery device Even if the falling part cannot be provided between the two, the condensate generated in the heating part surely flows down into the condensate recovery apparatus.
[0008]
【Example】
In this embodiment, an example in which the reaction kettle 1 is used as a heat exchanger will be shown. A jacket portion 2 as a heating portion is formed on the outer periphery of the reaction kettle 1 and a steam supply pipe 3 is connected thereto. The steam supply pipe 3 is connected with an open / close valve 4, a pressure control valve 5, and an ejector 6 in sequence. The ejector 6 is formed by a suction chamber 7 having a nozzle inside and a diffuser 8, and connects the outlet side of the nozzle, that is, the diffuser 8 to the jacket portion 2 through a conduit 9. Further, the pipe 9 is branched and an atmosphere communication pipe 10 and an opening / closing valve 11 are attached.
[0009]
The lower part of the jacket part 2 is connected to the condensate inlet 15 of the condensate recovery apparatus 16 via the pipe line 12. An open / close valve 13 and a check valve 14 that allows only passage of fluid from the jacket portion 2 to the condensate recovery device 16 are attached to the pipe 12. A condensate recovery pipe 19 is also attached to the condensate outlet 17 of the condensate recovery device 16 via a check valve 18. The check valve 18 allows only passage of fluid from the condensate recovery device 16 to the condensate recovery pipe 19 side.
[0010]
A pumping fluid inlet 20 and an exhaust port 21 are provided in the upper part of the condensate recovery device 16, and the pumping fluid inlet 20 is connected to the steam supply pipe 3 through a pipeline 22, and the exhaust port 21 is connected to a pipeline 23. Is connected to the suction chamber 7 of the ejector 6.
[0011]
The detailed structure of the condensate recovery device 16 is shown in FIG. When the condensate flowing in from the condensate inlet 15 accumulates in the main body 25 and the water level rises, the float 26 and the flow trevor 27 also rise around the rotation pin 28. As the float 26 moves up, a tension coil spring 29 having one end attached to the flow lever 27 and a swing arm 30 provided on the opposite side of the rotating pin 28 and having the other end of the tension coil spring 29 attached thereto. Is biased while the tensile force of the tension coil spring 29 gradually increases.
[0012]
Further, the float 26 rises, and the central axes of the flow lever 27, the tension coil spring 29, and the swing arm 30 overlap each other, and the float arm 27 is displaced upward from the position. At the moment, the increased tensile force of the tension coil spring 29 displaces the swing arm 30 upward about the pivot pin 28, thereby snapping the valve stem 31 attached to the swing arm 30 upward. Move.
[0013]
By attaching the pressure feed valve 32 and the exhaust valve 33 to the upper end of the valve rod 31, the pressure feed valve 32 is opened due to the rise of the float 26, that is, the retention of condensate in the main body 25. 33 closes. On the contrary, when the float 26 is lowered, the pressure feed valve 32 is closed and the exhaust valve 33 is opened, as shown in FIG.
[0014]
In FIG. 1, by supplying steam for heating from the steam supply pipe 3 to the jacket portion 2 of the reaction kettle 1 through the ejector 6, the object to be heated in the reaction kettle 1 is heated. The heating steam temperature can be arbitrarily adjusted by adjusting the steam pressure by the pressure control valve 5 because the steam pressure and temperature have a one-to-one relationship. Steam deprived of heat by heating condenses into condensate.
[0015]
As the steam passes through the ejector 6, a suction force is generated in the suction chamber 7, and the condensate generated in the jacket portion 2 is retained by making the inside of the condensate recovery device 16 in a predetermined vacuum state via the pipe line 23. It flows down into the condensate recovery device 16 without doing so. When the water level in the condensate recovery device 16 reaches a predetermined level, the valve rod 31 in FIG. 2 snaps, opens the pressure feed valve 32 and closes the exhaust valve 33, thereby closing the main body 25 from the pipe line 22. High-pressure steam is supplied into the main body 25, and the condensate in the main body 25 is pumped to the collection destination via the check valve 18.
[0016]
When the condensate is pumped and the water level in the condensate recovery device 16 is lowered, the valve rod 31 snaps in the reverse direction, whereby the pumping valve 32 is closed and the exhaust valve 33 is opened. Aspirate the condensate inside. The above operation cycle is repeated to heat the reaction kettle 1 with low temperature steam.
[0017]
When performing steam heating, if non-condensable gas such as air is mixed in the steam, the heat transfer efficiency is extremely lowered. Further, in the initial stage of starting heating, a large amount of air generally remains in the heating device. In such a case, the suction of the ejector 6 is performed by opening the on-off valves 35, 13, and 36 while allowing the steam to pass through the ejector 6, and then closing the on-off valve 35 and opening the on-off valve 11. The air remaining in the jacket portion 2 and the condensate recovery device 16 to the chamber 7 can be eliminated via the atmosphere communication pipe 10, and a decrease in heat transfer efficiency in the steam heating device can be prevented.
[0018]
【The invention's effect】
As described above, according to the present invention, the inside of the condensate recovery device can be brought into a vacuum state of atmospheric pressure or less by the nozzle and the suction chamber, and the condensate is surely flowed down into the condensate recovery device, Condensate is not retained in the heating section of the exchanger, and therefore, the heated object of the heat exchanger can be heated uniformly without causing temperature unevenness.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an embodiment of a steam heating apparatus of the present invention.
FIG. 2 is a configuration diagram of a condensate recovery device used in the steam heating device of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reaction kettle 2 Jacket part 3 Steam supply pipe 6 Ejector 7 Suction chamber 8 Diffuser 14 Check valve 15 Condensate inlet 16 Condensate recovery device 17 Condensate outlet 18 Check valve 20 Pumping fluid inlet 21 Exhaust outlet 26 Flow -G 29 Tension coil spring 31 Valve rod 32 Pressure feed valve 33 Exhaust valve

Claims (1)

With connecting steam supply pipe for heating forms a heating unit to the heat exchanger, connecting the condensate collecting device for discharging condensate produced by heating, communicates with the steam supply pipe to the inlet side of the heating unit It was placed a nozzle connected to the heating unit to an outlet side of the nozzle, in forming a suction chamber covering the periphery of the nozzle that connects the suction chamber and the condensate collecting device, outlet and heating of the nozzle Are connected via a pipe line, the pipe is branched, an atmospheric communication pipe and an on-off valve are attached, and residual air in the heating unit and the condensate recovery device is excluded from the atmospheric communication pipe and the on-off valve. A steam heating device characterized by.

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